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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
daa93fab SR |
2 | # Select 32 or 64 bit |
3 | config 64BIT | |
104daea1 MY |
4 | bool "64-bit kernel" if "$(ARCH)" = "x86" |
5 | default "$(ARCH)" != "i386" | |
8f9ca475 | 6 | ---help--- |
daa93fab SR |
7 | Say yes to build a 64-bit kernel - formerly known as x86_64 |
8 | Say no to build a 32-bit kernel - formerly known as i386 | |
9 | ||
10 | config X86_32 | |
3120e25e JB |
11 | def_bool y |
12 | depends on !64BIT | |
341c787e IM |
13 | # Options that are inherently 32-bit kernel only: |
14 | select ARCH_WANT_IPC_PARSE_VERSION | |
15 | select CLKSRC_I8253 | |
16 | select CLONE_BACKWARDS | |
117ed454 | 17 | select HAVE_DEBUG_STACKOVERFLOW |
341c787e IM |
18 | select MODULES_USE_ELF_REL |
19 | select OLD_SIGACTION | |
7ac87074 | 20 | select GENERIC_VDSO_32 |
daa93fab SR |
21 | |
22 | config X86_64 | |
3120e25e JB |
23 | def_bool y |
24 | depends on 64BIT | |
d94e0685 | 25 | # Options that are inherently 64-bit kernel only: |
4eb0716e | 26 | select ARCH_HAS_GIGANTIC_PAGE |
d94e0685 IM |
27 | select ARCH_SUPPORTS_INT128 |
28 | select ARCH_USE_CMPXCHG_LOCKREF | |
29 | select HAVE_ARCH_SOFT_DIRTY | |
30 | select MODULES_USE_ELF_RELA | |
f616ab59 | 31 | select NEED_DMA_MAP_STATE |
09230cbc | 32 | select SWIOTLB |
f8781c4a | 33 | select ARCH_HAS_SYSCALL_WRAPPER |
1032c0ba | 34 | |
518049d9 SRV |
35 | config FORCE_DYNAMIC_FTRACE |
36 | def_bool y | |
37 | depends on X86_32 | |
38 | depends on FUNCTION_TRACER | |
39 | select DYNAMIC_FTRACE | |
40 | help | |
41 | We keep the static function tracing (!DYNAMIC_FTRACE) around | |
42 | in order to test the non static function tracing in the | |
43 | generic code, as other architectures still use it. But we | |
44 | only need to keep it around for x86_64. No need to keep it | |
45 | for x86_32. For x86_32, force DYNAMIC_FTRACE. | |
d94e0685 IM |
46 | # |
47 | # Arch settings | |
48 | # | |
49 | # ( Note that options that are marked 'if X86_64' could in principle be | |
50 | # ported to 32-bit as well. ) | |
51 | # | |
8d5fffb9 | 52 | config X86 |
3c2362e6 | 53 | def_bool y |
c763ea26 IM |
54 | # |
55 | # Note: keep this list sorted alphabetically | |
56 | # | |
6471b825 IM |
57 | select ACPI_LEGACY_TABLES_LOOKUP if ACPI |
58 | select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI | |
942fa985 | 59 | select ARCH_32BIT_OFF_T if X86_32 |
6471b825 | 60 | select ARCH_CLOCKSOURCE_DATA |
2a21ad57 | 61 | select ARCH_CLOCKSOURCE_INIT |
c763ea26 | 62 | select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI |
fa5b6ec9 | 63 | select ARCH_HAS_DEBUG_VIRTUAL |
21266be9 | 64 | select ARCH_HAS_DEVMEM_IS_ALLOWED |
6471b825 | 65 | select ARCH_HAS_ELF_RANDOMIZE |
72d93104 | 66 | select ARCH_HAS_FAST_MULTIPLIER |
316d097c | 67 | select ARCH_HAS_FILTER_PGPROT |
6974f0c4 | 68 | select ARCH_HAS_FORTIFY_SOURCE |
957e3fac | 69 | select ARCH_HAS_GCOV_PROFILE_ALL |
5c9a8750 | 70 | select ARCH_HAS_KCOV if X86_64 |
10bcc80e | 71 | select ARCH_HAS_MEMBARRIER_SYNC_CORE |
c763ea26 | 72 | select ARCH_HAS_PMEM_API if X86_64 |
17596731 | 73 | select ARCH_HAS_PTE_DEVMAP if X86_64 |
3010a5ea | 74 | select ARCH_HAS_PTE_SPECIAL |
39208aa7 | 75 | select ARCH_HAS_REFCOUNT |
0aed55af | 76 | select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64 |
092b31aa | 77 | select ARCH_HAS_UACCESS_MCSAFE if X86_64 && X86_MCE |
d2852a22 | 78 | select ARCH_HAS_SET_MEMORY |
d253ca0c | 79 | select ARCH_HAS_SET_DIRECT_MAP |
ad21fc4f LA |
80 | select ARCH_HAS_STRICT_KERNEL_RWX |
81 | select ARCH_HAS_STRICT_MODULE_RWX | |
ac1ab12a | 82 | select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE |
c6d30853 | 83 | select ARCH_HAS_UBSAN_SANITIZE_ALL |
6471b825 IM |
84 | select ARCH_HAVE_NMI_SAFE_CMPXCHG |
85 | select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI | |
77fbbc81 | 86 | select ARCH_MIGHT_HAVE_PC_PARPORT |
5e2c18c0 | 87 | select ARCH_MIGHT_HAVE_PC_SERIO |
3599fe12 | 88 | select ARCH_STACKWALK |
2c870e61 | 89 | select ARCH_SUPPORTS_ACPI |
6471b825 | 90 | select ARCH_SUPPORTS_ATOMIC_RMW |
6471b825 IM |
91 | select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 |
92 | select ARCH_USE_BUILTIN_BSWAP | |
6471b825 IM |
93 | select ARCH_USE_QUEUED_RWLOCKS |
94 | select ARCH_USE_QUEUED_SPINLOCKS | |
ce4a4e56 | 95 | select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
c763ea26 | 96 | select ARCH_WANTS_DYNAMIC_TASK_STRUCT |
3876d4a3 | 97 | select ARCH_WANT_HUGE_PMD_SHARE |
38d8b4e6 | 98 | select ARCH_WANTS_THP_SWAP if X86_64 |
6471b825 IM |
99 | select BUILDTIME_EXTABLE_SORT |
100 | select CLKEVT_I8253 | |
6471b825 IM |
101 | select CLOCKSOURCE_VALIDATE_LAST_CYCLE |
102 | select CLOCKSOURCE_WATCHDOG | |
6471b825 | 103 | select DCACHE_WORD_ACCESS |
45471cd9 LT |
104 | select EDAC_ATOMIC_SCRUB |
105 | select EDAC_SUPPORT | |
6471b825 IM |
106 | select GENERIC_CLOCKEVENTS |
107 | select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) | |
108 | select GENERIC_CLOCKEVENTS_MIN_ADJUST | |
109 | select GENERIC_CMOS_UPDATE | |
110 | select GENERIC_CPU_AUTOPROBE | |
61dc0f55 | 111 | select GENERIC_CPU_VULNERABILITIES |
5b7c73e0 | 112 | select GENERIC_EARLY_IOREMAP |
6471b825 IM |
113 | select GENERIC_FIND_FIRST_BIT |
114 | select GENERIC_IOMAP | |
c7d6c9dd | 115 | select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP |
0fa115da | 116 | select GENERIC_IRQ_MATRIX_ALLOCATOR if X86_LOCAL_APIC |
ad7a929f | 117 | select GENERIC_IRQ_MIGRATION if SMP |
6471b825 | 118 | select GENERIC_IRQ_PROBE |
c201c917 | 119 | select GENERIC_IRQ_RESERVATION_MODE |
6471b825 IM |
120 | select GENERIC_IRQ_SHOW |
121 | select GENERIC_PENDING_IRQ if SMP | |
122 | select GENERIC_SMP_IDLE_THREAD | |
123 | select GENERIC_STRNCPY_FROM_USER | |
124 | select GENERIC_STRNLEN_USER | |
125 | select GENERIC_TIME_VSYSCALL | |
7ac87074 | 126 | select GENERIC_GETTIMEOFDAY |
39656e83 | 127 | select GUP_GET_PTE_LOW_HIGH if X86_PAE |
7edaeb68 | 128 | select HARDLOCKUP_CHECK_TIMESTAMP if X86_64 |
6471b825 IM |
129 | select HAVE_ACPI_APEI if ACPI |
130 | select HAVE_ACPI_APEI_NMI if ACPI | |
131 | select HAVE_ALIGNED_STRUCT_PAGE if SLUB | |
6471b825 IM |
132 | select HAVE_ARCH_AUDITSYSCALL |
133 | select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE | |
134 | select HAVE_ARCH_JUMP_LABEL | |
b34006c4 | 135 | select HAVE_ARCH_JUMP_LABEL_RELATIVE |
d17a1d97 | 136 | select HAVE_ARCH_KASAN if X86_64 |
6471b825 | 137 | select HAVE_ARCH_KGDB |
9e08f57d DC |
138 | select HAVE_ARCH_MMAP_RND_BITS if MMU |
139 | select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT | |
1b028f78 | 140 | select HAVE_ARCH_COMPAT_MMAP_BASES if MMU && COMPAT |
271ca788 | 141 | select HAVE_ARCH_PREL32_RELOCATIONS |
6471b825 | 142 | select HAVE_ARCH_SECCOMP_FILTER |
f7d83c1c | 143 | select HAVE_ARCH_THREAD_STRUCT_WHITELIST |
afaef01c | 144 | select HAVE_ARCH_STACKLEAK |
6471b825 IM |
145 | select HAVE_ARCH_TRACEHOOK |
146 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE | |
a00cc7d9 | 147 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64 |
e37e43a4 | 148 | select HAVE_ARCH_VMAP_STACK if X86_64 |
c763ea26 | 149 | select HAVE_ARCH_WITHIN_STACK_FRAMES |
6471b825 IM |
150 | select HAVE_CMPXCHG_DOUBLE |
151 | select HAVE_CMPXCHG_LOCAL | |
152 | select HAVE_CONTEXT_TRACKING if X86_64 | |
c1bd55f9 | 153 | select HAVE_COPY_THREAD_TLS |
cf4db259 | 154 | select HAVE_C_RECORDMCOUNT |
6471b825 | 155 | select HAVE_DEBUG_KMEMLEAK |
6471b825 | 156 | select HAVE_DMA_CONTIGUOUS |
677aa9f7 | 157 | select HAVE_DYNAMIC_FTRACE |
06aeaaea | 158 | select HAVE_DYNAMIC_FTRACE_WITH_REGS |
03f5781b | 159 | select HAVE_EBPF_JIT |
58340a07 | 160 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
6630a8e5 | 161 | select HAVE_EISA |
5f56a5df | 162 | select HAVE_EXIT_THREAD |
67a929e0 | 163 | select HAVE_FAST_GUP |
644e0e8d | 164 | select HAVE_FENTRY if X86_64 || DYNAMIC_FTRACE |
6471b825 | 165 | select HAVE_FTRACE_MCOUNT_RECORD |
6471b825 IM |
166 | select HAVE_FUNCTION_GRAPH_TRACER |
167 | select HAVE_FUNCTION_TRACER | |
6b90bd4b | 168 | select HAVE_GCC_PLUGINS |
6471b825 IM |
169 | select HAVE_HW_BREAKPOINT |
170 | select HAVE_IDE | |
171 | select HAVE_IOREMAP_PROT | |
172 | select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64 | |
173 | select HAVE_IRQ_TIME_ACCOUNTING | |
2e9f3bdd | 174 | select HAVE_KERNEL_BZIP2 |
6471b825 IM |
175 | select HAVE_KERNEL_GZIP |
176 | select HAVE_KERNEL_LZ4 | |
2e9f3bdd | 177 | select HAVE_KERNEL_LZMA |
13510997 | 178 | select HAVE_KERNEL_LZO |
6471b825 IM |
179 | select HAVE_KERNEL_XZ |
180 | select HAVE_KPROBES | |
181 | select HAVE_KPROBES_ON_FTRACE | |
540adea3 | 182 | select HAVE_FUNCTION_ERROR_INJECTION |
6471b825 IM |
183 | select HAVE_KRETPROBES |
184 | select HAVE_KVM | |
185 | select HAVE_LIVEPATCH if X86_64 | |
6471b825 | 186 | select HAVE_MEMBLOCK_NODE_MAP |
0102752e | 187 | select HAVE_MIXED_BREAKPOINTS_REGS |
ee9f8fce | 188 | select HAVE_MOD_ARCH_SPECIFIC |
9f132f7e | 189 | select HAVE_MOVE_PMD |
42a0bb3f | 190 | select HAVE_NMI |
6471b825 IM |
191 | select HAVE_OPROFILE |
192 | select HAVE_OPTPROBES | |
193 | select HAVE_PCSPKR_PLATFORM | |
194 | select HAVE_PERF_EVENTS | |
c01d4323 | 195 | select HAVE_PERF_EVENTS_NMI |
92e5aae4 | 196 | select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI |
eb01d42a | 197 | select HAVE_PCI |
c5e63197 | 198 | select HAVE_PERF_REGS |
c5ebcedb | 199 | select HAVE_PERF_USER_STACK_DUMP |
48a8b97c | 200 | select HAVE_RCU_TABLE_FREE if PARAVIRT |
6471b825 | 201 | select HAVE_REGS_AND_STACK_ACCESS_API |
6415b38b | 202 | select HAVE_RELIABLE_STACKTRACE if X86_64 && (UNWINDER_FRAME_POINTER || UNWINDER_ORC) && STACK_VALIDATION |
3c88ee19 | 203 | select HAVE_FUNCTION_ARG_ACCESS_API |
d148eac0 | 204 | select HAVE_STACKPROTECTOR if CC_HAS_SANE_STACKPROTECTOR |
c763ea26 | 205 | select HAVE_STACK_VALIDATION if X86_64 |
d6761b8f | 206 | select HAVE_RSEQ |
6471b825 | 207 | select HAVE_SYSCALL_TRACEPOINTS |
6471b825 | 208 | select HAVE_UNSTABLE_SCHED_CLOCK |
7c68af6e | 209 | select HAVE_USER_RETURN_NOTIFIER |
7ac87074 | 210 | select HAVE_GENERIC_VDSO |
05736e4a | 211 | select HOTPLUG_SMT if SMP |
c0185808 | 212 | select IRQ_FORCED_THREADING |
86596f0a | 213 | select NEED_SG_DMA_LENGTH |
2eac9c2d | 214 | select PCI_DOMAINS if PCI |
625210cf | 215 | select PCI_LOCKLESS_CONFIG if PCI |
6471b825 | 216 | select PERF_EVENTS |
3195ef59 | 217 | select RTC_LIB |
d6faca40 | 218 | select RTC_MC146818_LIB |
6471b825 | 219 | select SPARSE_IRQ |
83fe27ea | 220 | select SRCU |
6471b825 | 221 | select SYSCTL_EXCEPTION_TRACE |
15f4eae7 | 222 | select THREAD_INFO_IN_TASK |
6471b825 IM |
223 | select USER_STACKTRACE_SUPPORT |
224 | select VIRT_TO_BUS | |
6471b825 | 225 | select X86_FEATURE_NAMES if PROC_FS |
0c608dad | 226 | select PROC_PID_ARCH_STATUS if PROC_FS |
7d8330a5 | 227 | |
ba7e4d13 | 228 | config INSTRUCTION_DECODER |
3120e25e JB |
229 | def_bool y |
230 | depends on KPROBES || PERF_EVENTS || UPROBES | |
ba7e4d13 | 231 | |
51b26ada LT |
232 | config OUTPUT_FORMAT |
233 | string | |
234 | default "elf32-i386" if X86_32 | |
235 | default "elf64-x86-64" if X86_64 | |
236 | ||
73531905 | 237 | config ARCH_DEFCONFIG |
b9b39bfb | 238 | string |
73531905 SR |
239 | default "arch/x86/configs/i386_defconfig" if X86_32 |
240 | default "arch/x86/configs/x86_64_defconfig" if X86_64 | |
b9b39bfb | 241 | |
8d5fffb9 | 242 | config LOCKDEP_SUPPORT |
3c2362e6 | 243 | def_bool y |
8d5fffb9 SR |
244 | |
245 | config STACKTRACE_SUPPORT | |
3c2362e6 | 246 | def_bool y |
8d5fffb9 | 247 | |
8d5fffb9 | 248 | config MMU |
3c2362e6 | 249 | def_bool y |
8d5fffb9 | 250 | |
9e08f57d DC |
251 | config ARCH_MMAP_RND_BITS_MIN |
252 | default 28 if 64BIT | |
253 | default 8 | |
254 | ||
255 | config ARCH_MMAP_RND_BITS_MAX | |
256 | default 32 if 64BIT | |
257 | default 16 | |
258 | ||
259 | config ARCH_MMAP_RND_COMPAT_BITS_MIN | |
260 | default 8 | |
261 | ||
262 | config ARCH_MMAP_RND_COMPAT_BITS_MAX | |
263 | default 16 | |
264 | ||
8d5fffb9 SR |
265 | config SBUS |
266 | bool | |
267 | ||
268 | config GENERIC_ISA_DMA | |
3120e25e JB |
269 | def_bool y |
270 | depends on ISA_DMA_API | |
8d5fffb9 | 271 | |
8d5fffb9 | 272 | config GENERIC_BUG |
3c2362e6 | 273 | def_bool y |
8d5fffb9 | 274 | depends on BUG |
b93a531e JB |
275 | select GENERIC_BUG_RELATIVE_POINTERS if X86_64 |
276 | ||
277 | config GENERIC_BUG_RELATIVE_POINTERS | |
278 | bool | |
8d5fffb9 | 279 | |
8d5fffb9 | 280 | config ARCH_MAY_HAVE_PC_FDC |
3120e25e JB |
281 | def_bool y |
282 | depends on ISA_DMA_API | |
8d5fffb9 | 283 | |
1032c0ba SR |
284 | config GENERIC_CALIBRATE_DELAY |
285 | def_bool y | |
286 | ||
9a0b8415 | 287 | config ARCH_HAS_CPU_RELAX |
288 | def_bool y | |
289 | ||
1b27d05b PE |
290 | config ARCH_HAS_CACHE_LINE_SIZE |
291 | def_bool y | |
292 | ||
316d097c DH |
293 | config ARCH_HAS_FILTER_PGPROT |
294 | def_bool y | |
295 | ||
dd5af90a | 296 | config HAVE_SETUP_PER_CPU_AREA |
89c9c4c5 | 297 | def_bool y |
b32ef636 | 298 | |
08fc4580 TH |
299 | config NEED_PER_CPU_EMBED_FIRST_CHUNK |
300 | def_bool y | |
301 | ||
302 | config NEED_PER_CPU_PAGE_FIRST_CHUNK | |
11124411 TH |
303 | def_bool y |
304 | ||
801e4062 JB |
305 | config ARCH_HIBERNATION_POSSIBLE |
306 | def_bool y | |
801e4062 | 307 | |
f4cb5700 JB |
308 | config ARCH_SUSPEND_POSSIBLE |
309 | def_bool y | |
f4cb5700 | 310 | |
53313b2c SC |
311 | config ARCH_WANT_GENERAL_HUGETLB |
312 | def_bool y | |
313 | ||
8d5fffb9 | 314 | config ZONE_DMA32 |
e0fd24a3 | 315 | def_bool y if X86_64 |
8d5fffb9 | 316 | |
8d5fffb9 | 317 | config AUDIT_ARCH |
e0fd24a3 | 318 | def_bool y if X86_64 |
8d5fffb9 | 319 | |
6a11f75b AM |
320 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
321 | def_bool y | |
322 | ||
d6f2d75a AR |
323 | config KASAN_SHADOW_OFFSET |
324 | hex | |
325 | depends on KASAN | |
326 | default 0xdffffc0000000000 | |
327 | ||
69575d38 SW |
328 | config HAVE_INTEL_TXT |
329 | def_bool y | |
6ea30386 | 330 | depends on INTEL_IOMMU && ACPI |
69575d38 | 331 | |
6b0c3d44 SR |
332 | config X86_32_SMP |
333 | def_bool y | |
334 | depends on X86_32 && SMP | |
335 | ||
336 | config X86_64_SMP | |
337 | def_bool y | |
338 | depends on X86_64 && SMP | |
339 | ||
ccbeed3a TH |
340 | config X86_32_LAZY_GS |
341 | def_bool y | |
8458f8c2 | 342 | depends on X86_32 && !STACKPROTECTOR |
ccbeed3a | 343 | |
2b144498 SD |
344 | config ARCH_SUPPORTS_UPROBES |
345 | def_bool y | |
346 | ||
d20642f0 RH |
347 | config FIX_EARLYCON_MEM |
348 | def_bool y | |
349 | ||
94d49eb3 KS |
350 | config DYNAMIC_PHYSICAL_MASK |
351 | bool | |
352 | ||
98233368 KS |
353 | config PGTABLE_LEVELS |
354 | int | |
77ef56e4 | 355 | default 5 if X86_5LEVEL |
98233368 KS |
356 | default 4 if X86_64 |
357 | default 3 if X86_PAE | |
358 | default 2 | |
359 | ||
2a61f474 MY |
360 | config CC_HAS_SANE_STACKPROTECTOR |
361 | bool | |
362 | default $(success,$(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC)) if 64BIT | |
363 | default $(success,$(srctree)/scripts/gcc-x86_32-has-stack-protector.sh $(CC)) | |
364 | help | |
365 | We have to make sure stack protector is unconditionally disabled if | |
366 | the compiler produces broken code. | |
367 | ||
506f1d07 SR |
368 | menu "Processor type and features" |
369 | ||
5ee71535 RD |
370 | config ZONE_DMA |
371 | bool "DMA memory allocation support" if EXPERT | |
372 | default y | |
373 | help | |
374 | DMA memory allocation support allows devices with less than 32-bit | |
375 | addressing to allocate within the first 16MB of address space. | |
376 | Disable if no such devices will be used. | |
377 | ||
378 | If unsure, say Y. | |
379 | ||
506f1d07 SR |
380 | config SMP |
381 | bool "Symmetric multi-processing support" | |
382 | ---help--- | |
383 | This enables support for systems with more than one CPU. If you have | |
4a474157 RG |
384 | a system with only one CPU, say N. If you have a system with more |
385 | than one CPU, say Y. | |
506f1d07 | 386 | |
4a474157 | 387 | If you say N here, the kernel will run on uni- and multiprocessor |
506f1d07 SR |
388 | machines, but will use only one CPU of a multiprocessor machine. If |
389 | you say Y here, the kernel will run on many, but not all, | |
4a474157 | 390 | uniprocessor machines. On a uniprocessor machine, the kernel |
506f1d07 SR |
391 | will run faster if you say N here. |
392 | ||
393 | Note that if you say Y here and choose architecture "586" or | |
394 | "Pentium" under "Processor family", the kernel will not work on 486 | |
395 | architectures. Similarly, multiprocessor kernels for the "PPro" | |
396 | architecture may not work on all Pentium based boards. | |
397 | ||
398 | People using multiprocessor machines who say Y here should also say | |
399 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power | |
400 | Management" code will be disabled if you say Y here. | |
401 | ||
cb1aaebe | 402 | See also <file:Documentation/x86/i386/IO-APIC.rst>, |
4f4cfa6c | 403 | <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO available at |
506f1d07 SR |
404 | <http://www.tldp.org/docs.html#howto>. |
405 | ||
406 | If you don't know what to do here, say N. | |
407 | ||
9def39be JT |
408 | config X86_FEATURE_NAMES |
409 | bool "Processor feature human-readable names" if EMBEDDED | |
410 | default y | |
411 | ---help--- | |
412 | This option compiles in a table of x86 feature bits and corresponding | |
413 | names. This is required to support /proc/cpuinfo and a few kernel | |
414 | messages. You can disable this to save space, at the expense of | |
415 | making those few kernel messages show numeric feature bits instead. | |
416 | ||
417 | If in doubt, say Y. | |
418 | ||
06cd9a7d YL |
419 | config X86_X2APIC |
420 | bool "Support x2apic" | |
19e3d60d | 421 | depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST) |
06cd9a7d YL |
422 | ---help--- |
423 | This enables x2apic support on CPUs that have this feature. | |
424 | ||
425 | This allows 32-bit apic IDs (so it can support very large systems), | |
426 | and accesses the local apic via MSRs not via mmio. | |
427 | ||
06cd9a7d YL |
428 | If you don't know what to do here, say N. |
429 | ||
6695c85b | 430 | config X86_MPPARSE |
6e87f9b7 | 431 | bool "Enable MPS table" if ACPI || SFI |
7a527688 | 432 | default y |
5ab74722 | 433 | depends on X86_LOCAL_APIC |
8f9ca475 | 434 | ---help--- |
6695c85b YL |
435 | For old smp systems that do not have proper acpi support. Newer systems |
436 | (esp with 64bit cpus) with acpi support, MADT and DSDT will override it | |
6695c85b | 437 | |
ddd70cf9 JN |
438 | config GOLDFISH |
439 | def_bool y | |
440 | depends on X86_GOLDFISH | |
441 | ||
76b04384 DW |
442 | config RETPOLINE |
443 | bool "Avoid speculative indirect branches in kernel" | |
444 | default y | |
d5028ba8 | 445 | select STACK_VALIDATION if HAVE_STACK_VALIDATION |
76b04384 DW |
446 | help |
447 | Compile kernel with the retpoline compiler options to guard against | |
448 | kernel-to-user data leaks by avoiding speculative indirect | |
449 | branches. Requires a compiler with -mindirect-branch=thunk-extern | |
450 | support for full protection. The kernel may run slower. | |
451 | ||
e6d42931 JW |
452 | config X86_CPU_RESCTRL |
453 | bool "x86 CPU resource control support" | |
6fe07ce3 | 454 | depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD) |
59fe5a77 | 455 | select KERNFS |
78e99b4a | 456 | help |
e6d42931 | 457 | Enable x86 CPU resource control support. |
6fe07ce3 BM |
458 | |
459 | Provide support for the allocation and monitoring of system resources | |
460 | usage by the CPU. | |
461 | ||
462 | Intel calls this Intel Resource Director Technology | |
463 | (Intel(R) RDT). More information about RDT can be found in the | |
464 | Intel x86 Architecture Software Developer Manual. | |
465 | ||
466 | AMD calls this AMD Platform Quality of Service (AMD QoS). | |
467 | More information about AMD QoS can be found in the AMD64 Technology | |
468 | Platform Quality of Service Extensions manual. | |
78e99b4a FY |
469 | |
470 | Say N if unsure. | |
471 | ||
8425091f | 472 | if X86_32 |
a0d0bb4d RD |
473 | config X86_BIGSMP |
474 | bool "Support for big SMP systems with more than 8 CPUs" | |
475 | depends on SMP | |
476 | ---help--- | |
477 | This option is needed for the systems that have more than 8 CPUs | |
478 | ||
c5c606d9 RT |
479 | config X86_EXTENDED_PLATFORM |
480 | bool "Support for extended (non-PC) x86 platforms" | |
481 | default y | |
8f9ca475 | 482 | ---help--- |
06ac8346 IM |
483 | If you disable this option then the kernel will only support |
484 | standard PC platforms. (which covers the vast majority of | |
485 | systems out there.) | |
486 | ||
8425091f RT |
487 | If you enable this option then you'll be able to select support |
488 | for the following (non-PC) 32 bit x86 platforms: | |
cb7b8023 | 489 | Goldfish (Android emulator) |
8425091f | 490 | AMD Elan |
8425091f RT |
491 | RDC R-321x SoC |
492 | SGI 320/540 (Visual Workstation) | |
83125a3a | 493 | STA2X11-based (e.g. Northville) |
3f4110a4 | 494 | Moorestown MID devices |
06ac8346 IM |
495 | |
496 | If you have one of these systems, or if you want to build a | |
497 | generic distribution kernel, say Y here - otherwise say N. | |
8425091f | 498 | endif |
06ac8346 | 499 | |
8425091f RT |
500 | if X86_64 |
501 | config X86_EXTENDED_PLATFORM | |
502 | bool "Support for extended (non-PC) x86 platforms" | |
503 | default y | |
504 | ---help--- | |
505 | If you disable this option then the kernel will only support | |
506 | standard PC platforms. (which covers the vast majority of | |
507 | systems out there.) | |
508 | ||
509 | If you enable this option then you'll be able to select support | |
510 | for the following (non-PC) 64 bit x86 platforms: | |
44b111b5 | 511 | Numascale NumaChip |
8425091f RT |
512 | ScaleMP vSMP |
513 | SGI Ultraviolet | |
514 | ||
515 | If you have one of these systems, or if you want to build a | |
516 | generic distribution kernel, say Y here - otherwise say N. | |
517 | endif | |
c5c606d9 RT |
518 | # This is an alphabetically sorted list of 64 bit extended platforms |
519 | # Please maintain the alphabetic order if and when there are additions | |
44b111b5 SP |
520 | config X86_NUMACHIP |
521 | bool "Numascale NumaChip" | |
522 | depends on X86_64 | |
523 | depends on X86_EXTENDED_PLATFORM | |
524 | depends on NUMA | |
525 | depends on SMP | |
526 | depends on X86_X2APIC | |
f9726bfd | 527 | depends on PCI_MMCONFIG |
44b111b5 SP |
528 | ---help--- |
529 | Adds support for Numascale NumaChip large-SMP systems. Needed to | |
530 | enable more than ~168 cores. | |
531 | If you don't have one of these, you should say N here. | |
506f1d07 | 532 | |
c5c606d9 RT |
533 | config X86_VSMP |
534 | bool "ScaleMP vSMP" | |
6276a074 | 535 | select HYPERVISOR_GUEST |
c5c606d9 RT |
536 | select PARAVIRT |
537 | depends on X86_64 && PCI | |
538 | depends on X86_EXTENDED_PLATFORM | |
ead91d4b | 539 | depends on SMP |
8f9ca475 | 540 | ---help--- |
c5c606d9 RT |
541 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
542 | supposed to run on these EM64T-based machines. Only choose this option | |
543 | if you have one of these machines. | |
5e3a77e9 | 544 | |
03b48632 NP |
545 | config X86_UV |
546 | bool "SGI Ultraviolet" | |
547 | depends on X86_64 | |
c5c606d9 | 548 | depends on X86_EXTENDED_PLATFORM |
54c28d29 | 549 | depends on NUMA |
1ecb4ae5 | 550 | depends on EFI |
9d6c26e7 | 551 | depends on X86_X2APIC |
1222e564 | 552 | depends on PCI |
8f9ca475 | 553 | ---help--- |
03b48632 NP |
554 | This option is needed in order to support SGI Ultraviolet systems. |
555 | If you don't have one of these, you should say N here. | |
556 | ||
c5c606d9 RT |
557 | # Following is an alphabetically sorted list of 32 bit extended platforms |
558 | # Please maintain the alphabetic order if and when there are additions | |
506f1d07 | 559 | |
ddd70cf9 JN |
560 | config X86_GOLDFISH |
561 | bool "Goldfish (Virtual Platform)" | |
cb7b8023 | 562 | depends on X86_EXTENDED_PLATFORM |
ddd70cf9 JN |
563 | ---help--- |
564 | Enable support for the Goldfish virtual platform used primarily | |
565 | for Android development. Unless you are building for the Android | |
566 | Goldfish emulator say N here. | |
567 | ||
c751e17b TG |
568 | config X86_INTEL_CE |
569 | bool "CE4100 TV platform" | |
570 | depends on PCI | |
571 | depends on PCI_GODIRECT | |
6084a6e2 | 572 | depends on X86_IO_APIC |
c751e17b TG |
573 | depends on X86_32 |
574 | depends on X86_EXTENDED_PLATFORM | |
37bc9f50 | 575 | select X86_REBOOTFIXUPS |
da6b737b SAS |
576 | select OF |
577 | select OF_EARLY_FLATTREE | |
c751e17b TG |
578 | ---help--- |
579 | Select for the Intel CE media processor (CE4100) SOC. | |
580 | This option compiles in support for the CE4100 SOC for settop | |
581 | boxes and media devices. | |
582 | ||
4cb9b00f | 583 | config X86_INTEL_MID |
43605ef1 | 584 | bool "Intel MID platform support" |
43605ef1 | 585 | depends on X86_EXTENDED_PLATFORM |
edc6bc78 | 586 | depends on X86_PLATFORM_DEVICES |
1ea7c673 | 587 | depends on PCI |
3fda5bb4 | 588 | depends on X86_64 || (PCI_GOANY && X86_32) |
1ea7c673 | 589 | depends on X86_IO_APIC |
7c9c3a1e | 590 | select SFI |
4cb9b00f | 591 | select I2C |
7c9c3a1e | 592 | select DW_APB_TIMER |
1ea7c673 | 593 | select APB_TIMER |
1ea7c673 | 594 | select INTEL_SCU_IPC |
15a713df | 595 | select MFD_INTEL_MSIC |
1ea7c673 | 596 | ---help--- |
4cb9b00f DC |
597 | Select to build a kernel capable of supporting Intel MID (Mobile |
598 | Internet Device) platform systems which do not have the PCI legacy | |
599 | interfaces. If you are building for a PC class system say N here. | |
1ea7c673 | 600 | |
4cb9b00f DC |
601 | Intel MID platforms are based on an Intel processor and chipset which |
602 | consume less power than most of the x86 derivatives. | |
43605ef1 | 603 | |
8bbc2a13 BD |
604 | config X86_INTEL_QUARK |
605 | bool "Intel Quark platform support" | |
606 | depends on X86_32 | |
607 | depends on X86_EXTENDED_PLATFORM | |
608 | depends on X86_PLATFORM_DEVICES | |
609 | depends on X86_TSC | |
610 | depends on PCI | |
611 | depends on PCI_GOANY | |
612 | depends on X86_IO_APIC | |
613 | select IOSF_MBI | |
614 | select INTEL_IMR | |
9ab6eb51 | 615 | select COMMON_CLK |
8bbc2a13 BD |
616 | ---help--- |
617 | Select to include support for Quark X1000 SoC. | |
618 | Say Y here if you have a Quark based system such as the Arduino | |
619 | compatible Intel Galileo. | |
620 | ||
3d48aab1 MW |
621 | config X86_INTEL_LPSS |
622 | bool "Intel Low Power Subsystem Support" | |
5962dd22 | 623 | depends on X86 && ACPI && PCI |
3d48aab1 | 624 | select COMMON_CLK |
0f531431 | 625 | select PINCTRL |
eebb3e8d | 626 | select IOSF_MBI |
3d48aab1 MW |
627 | ---help--- |
628 | Select to build support for Intel Low Power Subsystem such as | |
629 | found on Intel Lynxpoint PCH. Selecting this option enables | |
0f531431 MN |
630 | things like clock tree (common clock framework) and pincontrol |
631 | which are needed by the LPSS peripheral drivers. | |
3d48aab1 | 632 | |
92082a88 KX |
633 | config X86_AMD_PLATFORM_DEVICE |
634 | bool "AMD ACPI2Platform devices support" | |
635 | depends on ACPI | |
636 | select COMMON_CLK | |
637 | select PINCTRL | |
638 | ---help--- | |
639 | Select to interpret AMD specific ACPI device to platform device | |
640 | such as I2C, UART, GPIO found on AMD Carrizo and later chipsets. | |
641 | I2C and UART depend on COMMON_CLK to set clock. GPIO driver is | |
642 | implemented under PINCTRL subsystem. | |
643 | ||
ced3ce76 DB |
644 | config IOSF_MBI |
645 | tristate "Intel SoC IOSF Sideband support for SoC platforms" | |
646 | depends on PCI | |
647 | ---help--- | |
648 | This option enables sideband register access support for Intel SoC | |
649 | platforms. On these platforms the IOSF sideband is used in lieu of | |
650 | MSR's for some register accesses, mostly but not limited to thermal | |
651 | and power. Drivers may query the availability of this device to | |
652 | determine if they need the sideband in order to work on these | |
653 | platforms. The sideband is available on the following SoC products. | |
654 | This list is not meant to be exclusive. | |
655 | - BayTrail | |
656 | - Braswell | |
657 | - Quark | |
658 | ||
659 | You should say Y if you are running a kernel on one of these SoC's. | |
660 | ||
ed2226bd DB |
661 | config IOSF_MBI_DEBUG |
662 | bool "Enable IOSF sideband access through debugfs" | |
663 | depends on IOSF_MBI && DEBUG_FS | |
664 | ---help--- | |
665 | Select this option to expose the IOSF sideband access registers (MCR, | |
666 | MDR, MCRX) through debugfs to write and read register information from | |
667 | different units on the SoC. This is most useful for obtaining device | |
668 | state information for debug and analysis. As this is a general access | |
669 | mechanism, users of this option would have specific knowledge of the | |
670 | device they want to access. | |
671 | ||
672 | If you don't require the option or are in doubt, say N. | |
673 | ||
c5c606d9 RT |
674 | config X86_RDC321X |
675 | bool "RDC R-321x SoC" | |
506f1d07 | 676 | depends on X86_32 |
c5c606d9 RT |
677 | depends on X86_EXTENDED_PLATFORM |
678 | select M486 | |
679 | select X86_REBOOTFIXUPS | |
680 | ---help--- | |
681 | This option is needed for RDC R-321x system-on-chip, also known | |
682 | as R-8610-(G). | |
683 | If you don't have one of these chips, you should say N here. | |
684 | ||
e0c7ae37 | 685 | config X86_32_NON_STANDARD |
9c398017 IM |
686 | bool "Support non-standard 32-bit SMP architectures" |
687 | depends on X86_32 && SMP | |
c5c606d9 | 688 | depends on X86_EXTENDED_PLATFORM |
8f9ca475 | 689 | ---help--- |
b5660ba7 PA |
690 | This option compiles in the bigsmp and STA2X11 default |
691 | subarchitectures. It is intended for a generic binary | |
692 | kernel. If you select them all, kernel will probe it one by | |
693 | one and will fallback to default. | |
d49c4288 | 694 | |
c5c606d9 | 695 | # Alphabetically sorted list of Non standard 32 bit platforms |
d49c4288 | 696 | |
d949f36f | 697 | config X86_SUPPORTS_MEMORY_FAILURE |
6fc108a0 | 698 | def_bool y |
d949f36f LT |
699 | # MCE code calls memory_failure(): |
700 | depends on X86_MCE | |
701 | # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: | |
d949f36f LT |
702 | # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: |
703 | depends on X86_64 || !SPARSEMEM | |
704 | select ARCH_SUPPORTS_MEMORY_FAILURE | |
d949f36f | 705 | |
83125a3a AR |
706 | config STA2X11 |
707 | bool "STA2X11 Companion Chip Support" | |
708 | depends on X86_32_NON_STANDARD && PCI | |
b6e05477 | 709 | select ARCH_HAS_PHYS_TO_DMA |
83125a3a AR |
710 | select SWIOTLB |
711 | select MFD_STA2X11 | |
0145071b | 712 | select GPIOLIB |
83125a3a AR |
713 | ---help--- |
714 | This adds support for boards based on the STA2X11 IO-Hub, | |
715 | a.k.a. "ConneXt". The chip is used in place of the standard | |
716 | PC chipset, so all "standard" peripherals are missing. If this | |
717 | option is selected the kernel will still be able to boot on | |
718 | standard PC machines. | |
719 | ||
82148d1d S |
720 | config X86_32_IRIS |
721 | tristate "Eurobraille/Iris poweroff module" | |
722 | depends on X86_32 | |
723 | ---help--- | |
724 | The Iris machines from EuroBraille do not have APM or ACPI support | |
725 | to shut themselves down properly. A special I/O sequence is | |
726 | needed to do so, which is what this module does at | |
727 | kernel shutdown. | |
728 | ||
729 | This is only for Iris machines from EuroBraille. | |
730 | ||
731 | If unused, say N. | |
732 | ||
ae1e9130 | 733 | config SCHED_OMIT_FRAME_POINTER |
3c2362e6 HH |
734 | def_bool y |
735 | prompt "Single-depth WCHAN output" | |
a87d0914 | 736 | depends on X86 |
8f9ca475 | 737 | ---help--- |
506f1d07 SR |
738 | Calculate simpler /proc/<PID>/wchan values. If this option |
739 | is disabled then wchan values will recurse back to the | |
740 | caller function. This provides more accurate wchan values, | |
741 | at the expense of slightly more scheduling overhead. | |
742 | ||
743 | If in doubt, say "Y". | |
744 | ||
6276a074 BP |
745 | menuconfig HYPERVISOR_GUEST |
746 | bool "Linux guest support" | |
8f9ca475 | 747 | ---help--- |
6276a074 BP |
748 | Say Y here to enable options for running Linux under various hyper- |
749 | visors. This option enables basic hypervisor detection and platform | |
750 | setup. | |
506f1d07 | 751 | |
6276a074 BP |
752 | If you say N, all options in this submenu will be skipped and |
753 | disabled, and Linux guest support won't be built in. | |
506f1d07 | 754 | |
6276a074 | 755 | if HYPERVISOR_GUEST |
506f1d07 | 756 | |
e61bd94a EPH |
757 | config PARAVIRT |
758 | bool "Enable paravirtualization code" | |
8f9ca475 | 759 | ---help--- |
e61bd94a EPH |
760 | This changes the kernel so it can modify itself when it is run |
761 | under a hypervisor, potentially improving performance significantly | |
762 | over full virtualization. However, when run without a hypervisor | |
763 | the kernel is theoretically slower and slightly larger. | |
764 | ||
c00a280a JG |
765 | config PARAVIRT_XXL |
766 | bool | |
767 | ||
6276a074 BP |
768 | config PARAVIRT_DEBUG |
769 | bool "paravirt-ops debugging" | |
770 | depends on PARAVIRT && DEBUG_KERNEL | |
771 | ---help--- | |
772 | Enable to debug paravirt_ops internals. Specifically, BUG if | |
773 | a paravirt_op is missing when it is called. | |
774 | ||
b4ecc126 JF |
775 | config PARAVIRT_SPINLOCKS |
776 | bool "Paravirtualization layer for spinlocks" | |
6ea30386 | 777 | depends on PARAVIRT && SMP |
b4ecc126 JF |
778 | ---help--- |
779 | Paravirtualized spinlocks allow a pvops backend to replace the | |
780 | spinlock implementation with something virtualization-friendly | |
781 | (for example, block the virtual CPU rather than spinning). | |
782 | ||
4c4e4f61 R |
783 | It has a minimal impact on native kernels and gives a nice performance |
784 | benefit on paravirtualized KVM / Xen kernels. | |
b4ecc126 | 785 | |
4c4e4f61 | 786 | If you are unsure how to answer this question, answer Y. |
b4ecc126 | 787 | |
ecca2502 ZY |
788 | config X86_HV_CALLBACK_VECTOR |
789 | def_bool n | |
790 | ||
6276a074 | 791 | source "arch/x86/xen/Kconfig" |
7af192c9 | 792 | |
6276a074 BP |
793 | config KVM_GUEST |
794 | bool "KVM Guest support (including kvmclock)" | |
795 | depends on PARAVIRT | |
796 | select PARAVIRT_CLOCK | |
797 | default y | |
8f9ca475 | 798 | ---help--- |
6276a074 BP |
799 | This option enables various optimizations for running under the KVM |
800 | hypervisor. It includes a paravirtualized clock, so that instead | |
801 | of relying on a PIT (or probably other) emulation by the | |
802 | underlying device model, the host provides the guest with | |
803 | timing infrastructure such as time of day, and system time | |
506f1d07 | 804 | |
7733607f MW |
805 | config PVH |
806 | bool "Support for running PVH guests" | |
807 | ---help--- | |
808 | This option enables the PVH entry point for guest virtual machines | |
809 | as specified in the x86/HVM direct boot ABI. | |
810 | ||
1e20eb85 SV |
811 | config KVM_DEBUG_FS |
812 | bool "Enable debug information for KVM Guests in debugfs" | |
813 | depends on KVM_GUEST && DEBUG_FS | |
1e20eb85 SV |
814 | ---help--- |
815 | This option enables collection of various statistics for KVM guest. | |
816 | Statistics are displayed in debugfs filesystem. Enabling this option | |
817 | may incur significant overhead. | |
818 | ||
6276a074 BP |
819 | config PARAVIRT_TIME_ACCOUNTING |
820 | bool "Paravirtual steal time accounting" | |
821 | depends on PARAVIRT | |
8f9ca475 | 822 | ---help--- |
6276a074 BP |
823 | Select this option to enable fine granularity task steal time |
824 | accounting. Time spent executing other tasks in parallel with | |
825 | the current vCPU is discounted from the vCPU power. To account for | |
826 | that, there can be a small performance impact. | |
827 | ||
828 | If in doubt, say N here. | |
829 | ||
830 | config PARAVIRT_CLOCK | |
831 | bool | |
97349135 | 832 | |
4a362601 JK |
833 | config JAILHOUSE_GUEST |
834 | bool "Jailhouse non-root cell support" | |
abde587b | 835 | depends on X86_64 && PCI |
87e65d05 | 836 | select X86_PM_TIMER |
4a362601 JK |
837 | ---help--- |
838 | This option allows to run Linux as guest in a Jailhouse non-root | |
839 | cell. You can leave this option disabled if you only want to start | |
840 | Jailhouse and run Linux afterwards in the root cell. | |
841 | ||
ec7972c9 ZY |
842 | config ACRN_GUEST |
843 | bool "ACRN Guest support" | |
844 | depends on X86_64 | |
498ad393 | 845 | select X86_HV_CALLBACK_VECTOR |
ec7972c9 ZY |
846 | help |
847 | This option allows to run Linux as guest in the ACRN hypervisor. ACRN is | |
848 | a flexible, lightweight reference open-source hypervisor, built with | |
849 | real-time and safety-criticality in mind. It is built for embedded | |
850 | IOT with small footprint and real-time features. More details can be | |
851 | found in https://projectacrn.org/. | |
852 | ||
6276a074 | 853 | endif #HYPERVISOR_GUEST |
97349135 | 854 | |
506f1d07 SR |
855 | source "arch/x86/Kconfig.cpu" |
856 | ||
857 | config HPET_TIMER | |
3c2362e6 | 858 | def_bool X86_64 |
506f1d07 | 859 | prompt "HPET Timer Support" if X86_32 |
8f9ca475 IM |
860 | ---help--- |
861 | Use the IA-PC HPET (High Precision Event Timer) to manage | |
862 | time in preference to the PIT and RTC, if a HPET is | |
863 | present. | |
864 | HPET is the next generation timer replacing legacy 8254s. | |
865 | The HPET provides a stable time base on SMP | |
866 | systems, unlike the TSC, but it is more expensive to access, | |
4e7f9df2 MT |
867 | as it is off-chip. The interface used is documented |
868 | in the HPET spec, revision 1. | |
506f1d07 | 869 | |
8f9ca475 IM |
870 | You can safely choose Y here. However, HPET will only be |
871 | activated if the platform and the BIOS support this feature. | |
872 | Otherwise the 8254 will be used for timing services. | |
506f1d07 | 873 | |
8f9ca475 | 874 | Choose N to continue using the legacy 8254 timer. |
506f1d07 SR |
875 | |
876 | config HPET_EMULATE_RTC | |
3c2362e6 | 877 | def_bool y |
9d8af78b | 878 | depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) |
506f1d07 | 879 | |
bb24c471 | 880 | config APB_TIMER |
933b9463 AC |
881 | def_bool y if X86_INTEL_MID |
882 | prompt "Intel MID APB Timer Support" if X86_INTEL_MID | |
06c3df49 | 883 | select DW_APB_TIMER |
a0c3832a | 884 | depends on X86_INTEL_MID && SFI |
bb24c471 JP |
885 | help |
886 | APB timer is the replacement for 8254, HPET on X86 MID platforms. | |
887 | The APBT provides a stable time base on SMP | |
888 | systems, unlike the TSC, but it is more expensive to access, | |
889 | as it is off-chip. APB timers are always running regardless of CPU | |
890 | C states, they are used as per CPU clockevent device when possible. | |
891 | ||
6a108a14 | 892 | # Mark as expert because too many people got it wrong. |
506f1d07 | 893 | # The code disables itself when not needed. |
7ae9392c TP |
894 | config DMI |
895 | default y | |
cf074402 | 896 | select DMI_SCAN_MACHINE_NON_EFI_FALLBACK |
6a108a14 | 897 | bool "Enable DMI scanning" if EXPERT |
8f9ca475 | 898 | ---help--- |
7ae9392c TP |
899 | Enabled scanning of DMI to identify machine quirks. Say Y |
900 | here unless you have verified that your setup is not | |
901 | affected by entries in the DMI blacklist. Required by PNP | |
902 | BIOS code. | |
903 | ||
506f1d07 | 904 | config GART_IOMMU |
38901f1c | 905 | bool "Old AMD GART IOMMU support" |
a4ce5a48 | 906 | select IOMMU_HELPER |
506f1d07 | 907 | select SWIOTLB |
23ac4ae8 | 908 | depends on X86_64 && PCI && AMD_NB |
8f9ca475 | 909 | ---help--- |
ced3c42c IM |
910 | Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron |
911 | GART based hardware IOMMUs. | |
912 | ||
913 | The GART supports full DMA access for devices with 32-bit access | |
914 | limitations, on systems with more than 3 GB. This is usually needed | |
915 | for USB, sound, many IDE/SATA chipsets and some other devices. | |
916 | ||
917 | Newer systems typically have a modern AMD IOMMU, supported via | |
918 | the CONFIG_AMD_IOMMU=y config option. | |
919 | ||
920 | In normal configurations this driver is only active when needed: | |
921 | there's more than 3 GB of memory and the system contains a | |
922 | 32-bit limited device. | |
923 | ||
924 | If unsure, say Y. | |
506f1d07 SR |
925 | |
926 | config CALGARY_IOMMU | |
927 | bool "IBM Calgary IOMMU support" | |
a4ce5a48 | 928 | select IOMMU_HELPER |
506f1d07 | 929 | select SWIOTLB |
6ea30386 | 930 | depends on X86_64 && PCI |
8f9ca475 | 931 | ---help--- |
506f1d07 SR |
932 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
933 | systems. Needed to run systems with more than 3GB of memory | |
934 | properly with 32-bit PCI devices that do not support DAC | |
935 | (Double Address Cycle). Calgary also supports bus level | |
936 | isolation, where all DMAs pass through the IOMMU. This | |
937 | prevents them from going anywhere except their intended | |
938 | destination. This catches hard-to-find kernel bugs and | |
939 | mis-behaving drivers and devices that do not use the DMA-API | |
940 | properly to set up their DMA buffers. The IOMMU can be | |
941 | turned off at boot time with the iommu=off parameter. | |
942 | Normally the kernel will make the right choice by itself. | |
943 | If unsure, say Y. | |
944 | ||
945 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT | |
3c2362e6 HH |
946 | def_bool y |
947 | prompt "Should Calgary be enabled by default?" | |
506f1d07 | 948 | depends on CALGARY_IOMMU |
8f9ca475 | 949 | ---help--- |
506f1d07 SR |
950 | Should Calgary be enabled by default? if you choose 'y', Calgary |
951 | will be used (if it exists). If you choose 'n', Calgary will not be | |
952 | used even if it exists. If you choose 'n' and would like to use | |
953 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. | |
954 | If unsure, say Y. | |
506f1d07 | 955 | |
1184dc2f | 956 | config MAXSMP |
ddb0c5a6 | 957 | bool "Enable Maximum number of SMP Processors and NUMA Nodes" |
6ea30386 | 958 | depends on X86_64 && SMP && DEBUG_KERNEL |
36f5101a | 959 | select CPUMASK_OFFSTACK |
8f9ca475 | 960 | ---help--- |
ddb0c5a6 | 961 | Enable maximum number of CPUS and NUMA Nodes for this architecture. |
1184dc2f | 962 | If unsure, say N. |
506f1d07 | 963 | |
aec6487e IM |
964 | # |
965 | # The maximum number of CPUs supported: | |
966 | # | |
967 | # The main config value is NR_CPUS, which defaults to NR_CPUS_DEFAULT, | |
968 | # and which can be configured interactively in the | |
969 | # [NR_CPUS_RANGE_BEGIN ... NR_CPUS_RANGE_END] range. | |
970 | # | |
971 | # The ranges are different on 32-bit and 64-bit kernels, depending on | |
972 | # hardware capabilities and scalability features of the kernel. | |
973 | # | |
974 | # ( If MAXSMP is enabled we just use the highest possible value and disable | |
975 | # interactive configuration. ) | |
976 | # | |
977 | ||
978 | config NR_CPUS_RANGE_BEGIN | |
a0d0bb4d | 979 | int |
aec6487e IM |
980 | default NR_CPUS_RANGE_END if MAXSMP |
981 | default 1 if !SMP | |
982 | default 2 | |
a0d0bb4d | 983 | |
aec6487e | 984 | config NR_CPUS_RANGE_END |
a0d0bb4d | 985 | int |
aec6487e IM |
986 | depends on X86_32 |
987 | default 64 if SMP && X86_BIGSMP | |
988 | default 8 if SMP && !X86_BIGSMP | |
989 | default 1 if !SMP | |
a0d0bb4d | 990 | |
aec6487e | 991 | config NR_CPUS_RANGE_END |
a0d0bb4d | 992 | int |
aec6487e IM |
993 | depends on X86_64 |
994 | default 8192 if SMP && ( MAXSMP || CPUMASK_OFFSTACK) | |
995 | default 512 if SMP && (!MAXSMP && !CPUMASK_OFFSTACK) | |
996 | default 1 if !SMP | |
a0d0bb4d | 997 | |
aec6487e | 998 | config NR_CPUS_DEFAULT |
a0d0bb4d RD |
999 | int |
1000 | depends on X86_32 | |
aec6487e IM |
1001 | default 32 if X86_BIGSMP |
1002 | default 8 if SMP | |
1003 | default 1 if !SMP | |
a0d0bb4d | 1004 | |
aec6487e | 1005 | config NR_CPUS_DEFAULT |
a0d0bb4d RD |
1006 | int |
1007 | depends on X86_64 | |
aec6487e IM |
1008 | default 8192 if MAXSMP |
1009 | default 64 if SMP | |
1010 | default 1 if !SMP | |
a0d0bb4d | 1011 | |
506f1d07 | 1012 | config NR_CPUS |
36f5101a | 1013 | int "Maximum number of CPUs" if SMP && !MAXSMP |
aec6487e IM |
1014 | range NR_CPUS_RANGE_BEGIN NR_CPUS_RANGE_END |
1015 | default NR_CPUS_DEFAULT | |
8f9ca475 | 1016 | ---help--- |
506f1d07 | 1017 | This allows you to specify the maximum number of CPUs which this |
bb61ccc7 | 1018 | kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum |
cad14bb9 | 1019 | supported value is 8192, otherwise the maximum value is 512. The |
506f1d07 SR |
1020 | minimum value which makes sense is 2. |
1021 | ||
aec6487e IM |
1022 | This is purely to save memory: each supported CPU adds about 8KB |
1023 | to the kernel image. | |
506f1d07 SR |
1024 | |
1025 | config SCHED_SMT | |
dbe73364 | 1026 | def_bool y if SMP |
506f1d07 SR |
1027 | |
1028 | config SCHED_MC | |
3c2362e6 HH |
1029 | def_bool y |
1030 | prompt "Multi-core scheduler support" | |
c8e56d20 | 1031 | depends on SMP |
8f9ca475 | 1032 | ---help--- |
506f1d07 SR |
1033 | Multi-core scheduler support improves the CPU scheduler's decision |
1034 | making when dealing with multi-core CPU chips at a cost of slightly | |
1035 | increased overhead in some places. If unsure say N here. | |
1036 | ||
de966cf4 TC |
1037 | config SCHED_MC_PRIO |
1038 | bool "CPU core priorities scheduler support" | |
0a21fc12 IM |
1039 | depends on SCHED_MC && CPU_SUP_INTEL |
1040 | select X86_INTEL_PSTATE | |
1041 | select CPU_FREQ | |
de966cf4 | 1042 | default y |
5e76b2ab | 1043 | ---help--- |
0a21fc12 IM |
1044 | Intel Turbo Boost Max Technology 3.0 enabled CPUs have a |
1045 | core ordering determined at manufacturing time, which allows | |
1046 | certain cores to reach higher turbo frequencies (when running | |
1047 | single threaded workloads) than others. | |
de966cf4 | 1048 | |
0a21fc12 IM |
1049 | Enabling this kernel feature teaches the scheduler about |
1050 | the TBM3 (aka ITMT) priority order of the CPU cores and adjusts the | |
1051 | scheduler's CPU selection logic accordingly, so that higher | |
1052 | overall system performance can be achieved. | |
de966cf4 | 1053 | |
0a21fc12 | 1054 | This feature will have no effect on CPUs without this feature. |
de966cf4 | 1055 | |
0a21fc12 | 1056 | If unsure say Y here. |
5e76b2ab | 1057 | |
30b8b006 TG |
1058 | config UP_LATE_INIT |
1059 | def_bool y | |
ba360f88 | 1060 | depends on !SMP && X86_LOCAL_APIC |
30b8b006 | 1061 | |
506f1d07 | 1062 | config X86_UP_APIC |
50849eef JB |
1063 | bool "Local APIC support on uniprocessors" if !PCI_MSI |
1064 | default PCI_MSI | |
38a1dfda | 1065 | depends on X86_32 && !SMP && !X86_32_NON_STANDARD |
8f9ca475 | 1066 | ---help--- |
506f1d07 SR |
1067 | A local APIC (Advanced Programmable Interrupt Controller) is an |
1068 | integrated interrupt controller in the CPU. If you have a single-CPU | |
1069 | system which has a processor with a local APIC, you can say Y here to | |
1070 | enable and use it. If you say Y here even though your machine doesn't | |
1071 | have a local APIC, then the kernel will still run with no slowdown at | |
1072 | all. The local APIC supports CPU-generated self-interrupts (timer, | |
1073 | performance counters), and the NMI watchdog which detects hard | |
1074 | lockups. | |
1075 | ||
1076 | config X86_UP_IOAPIC | |
1077 | bool "IO-APIC support on uniprocessors" | |
1078 | depends on X86_UP_APIC | |
8f9ca475 | 1079 | ---help--- |
506f1d07 SR |
1080 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an |
1081 | SMP-capable replacement for PC-style interrupt controllers. Most | |
1082 | SMP systems and many recent uniprocessor systems have one. | |
1083 | ||
1084 | If you have a single-CPU system with an IO-APIC, you can say Y here | |
1085 | to use it. If you say Y here even though your machine doesn't have | |
1086 | an IO-APIC, then the kernel will still run with no slowdown at all. | |
1087 | ||
1088 | config X86_LOCAL_APIC | |
3c2362e6 | 1089 | def_bool y |
0dbc6078 | 1090 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI |
b5dc8e6c | 1091 | select IRQ_DOMAIN_HIERARCHY |
52f518a3 | 1092 | select PCI_MSI_IRQ_DOMAIN if PCI_MSI |
506f1d07 SR |
1093 | |
1094 | config X86_IO_APIC | |
b1da1e71 JB |
1095 | def_bool y |
1096 | depends on X86_LOCAL_APIC || X86_UP_IOAPIC | |
506f1d07 | 1097 | |
41b9eb26 SA |
1098 | config X86_REROUTE_FOR_BROKEN_BOOT_IRQS |
1099 | bool "Reroute for broken boot IRQs" | |
41b9eb26 | 1100 | depends on X86_IO_APIC |
8f9ca475 | 1101 | ---help--- |
41b9eb26 SA |
1102 | This option enables a workaround that fixes a source of |
1103 | spurious interrupts. This is recommended when threaded | |
1104 | interrupt handling is used on systems where the generation of | |
1105 | superfluous "boot interrupts" cannot be disabled. | |
1106 | ||
1107 | Some chipsets generate a legacy INTx "boot IRQ" when the IRQ | |
1108 | entry in the chipset's IO-APIC is masked (as, e.g. the RT | |
1109 | kernel does during interrupt handling). On chipsets where this | |
1110 | boot IRQ generation cannot be disabled, this workaround keeps | |
1111 | the original IRQ line masked so that only the equivalent "boot | |
1112 | IRQ" is delivered to the CPUs. The workaround also tells the | |
1113 | kernel to set up the IRQ handler on the boot IRQ line. In this | |
1114 | way only one interrupt is delivered to the kernel. Otherwise | |
1115 | the spurious second interrupt may cause the kernel to bring | |
1116 | down (vital) interrupt lines. | |
1117 | ||
1118 | Only affects "broken" chipsets. Interrupt sharing may be | |
1119 | increased on these systems. | |
1120 | ||
506f1d07 | 1121 | config X86_MCE |
bab9bc65 | 1122 | bool "Machine Check / overheating reporting" |
648ed940 | 1123 | select GENERIC_ALLOCATOR |
e57dbaf7 | 1124 | default y |
506f1d07 | 1125 | ---help--- |
bab9bc65 AK |
1126 | Machine Check support allows the processor to notify the |
1127 | kernel if it detects a problem (e.g. overheating, data corruption). | |
506f1d07 | 1128 | The action the kernel takes depends on the severity of the problem, |
bab9bc65 | 1129 | ranging from warning messages to halting the machine. |
4efc0670 | 1130 | |
5de97c9f TL |
1131 | config X86_MCELOG_LEGACY |
1132 | bool "Support for deprecated /dev/mcelog character device" | |
1133 | depends on X86_MCE | |
1134 | ---help--- | |
1135 | Enable support for /dev/mcelog which is needed by the old mcelog | |
1136 | userspace logging daemon. Consider switching to the new generation | |
1137 | rasdaemon solution. | |
1138 | ||
506f1d07 | 1139 | config X86_MCE_INTEL |
3c2362e6 HH |
1140 | def_bool y |
1141 | prompt "Intel MCE features" | |
c1ebf835 | 1142 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 1143 | ---help--- |
506f1d07 SR |
1144 | Additional support for intel specific MCE features such as |
1145 | the thermal monitor. | |
1146 | ||
1147 | config X86_MCE_AMD | |
3c2362e6 HH |
1148 | def_bool y |
1149 | prompt "AMD MCE features" | |
f5382de9 | 1150 | depends on X86_MCE && X86_LOCAL_APIC && AMD_NB |
8f9ca475 | 1151 | ---help--- |
506f1d07 SR |
1152 | Additional support for AMD specific MCE features such as |
1153 | the DRAM Error Threshold. | |
1154 | ||
4efc0670 | 1155 | config X86_ANCIENT_MCE |
6fc108a0 | 1156 | bool "Support for old Pentium 5 / WinChip machine checks" |
c31d9633 | 1157 | depends on X86_32 && X86_MCE |
cd13adcc HS |
1158 | ---help--- |
1159 | Include support for machine check handling on old Pentium 5 or WinChip | |
5065a706 | 1160 | systems. These typically need to be enabled explicitly on the command |
cd13adcc | 1161 | line. |
4efc0670 | 1162 | |
b2762686 AK |
1163 | config X86_MCE_THRESHOLD |
1164 | depends on X86_MCE_AMD || X86_MCE_INTEL | |
6fc108a0 | 1165 | def_bool y |
b2762686 | 1166 | |
ea149b36 | 1167 | config X86_MCE_INJECT |
bc8e80d5 | 1168 | depends on X86_MCE && X86_LOCAL_APIC && DEBUG_FS |
ea149b36 AK |
1169 | tristate "Machine check injector support" |
1170 | ---help--- | |
1171 | Provide support for injecting machine checks for testing purposes. | |
1172 | If you don't know what a machine check is and you don't do kernel | |
1173 | QA it is safe to say n. | |
1174 | ||
4efc0670 AK |
1175 | config X86_THERMAL_VECTOR |
1176 | def_bool y | |
5bb38adc | 1177 | depends on X86_MCE_INTEL |
4efc0670 | 1178 | |
07dc900e | 1179 | source "arch/x86/events/Kconfig" |
e633c65a | 1180 | |
5aef51c3 | 1181 | config X86_LEGACY_VM86 |
1e642812 | 1182 | bool "Legacy VM86 support" |
506f1d07 | 1183 | depends on X86_32 |
8f9ca475 | 1184 | ---help--- |
5aef51c3 AL |
1185 | This option allows user programs to put the CPU into V8086 |
1186 | mode, which is an 80286-era approximation of 16-bit real mode. | |
1187 | ||
1188 | Some very old versions of X and/or vbetool require this option | |
1189 | for user mode setting. Similarly, DOSEMU will use it if | |
1190 | available to accelerate real mode DOS programs. However, any | |
1191 | recent version of DOSEMU, X, or vbetool should be fully | |
1192 | functional even without kernel VM86 support, as they will all | |
1e642812 IM |
1193 | fall back to software emulation. Nevertheless, if you are using |
1194 | a 16-bit DOS program where 16-bit performance matters, vm86 | |
1195 | mode might be faster than emulation and you might want to | |
1196 | enable this option. | |
5aef51c3 | 1197 | |
1e642812 IM |
1198 | Note that any app that works on a 64-bit kernel is unlikely to |
1199 | need this option, as 64-bit kernels don't, and can't, support | |
1200 | V8086 mode. This option is also unrelated to 16-bit protected | |
1201 | mode and is not needed to run most 16-bit programs under Wine. | |
5aef51c3 | 1202 | |
1e642812 IM |
1203 | Enabling this option increases the complexity of the kernel |
1204 | and slows down exception handling a tiny bit. | |
5aef51c3 | 1205 | |
1e642812 | 1206 | If unsure, say N here. |
5aef51c3 AL |
1207 | |
1208 | config VM86 | |
1209 | bool | |
1210 | default X86_LEGACY_VM86 | |
34273f41 PA |
1211 | |
1212 | config X86_16BIT | |
1213 | bool "Enable support for 16-bit segments" if EXPERT | |
1214 | default y | |
a5b9e5a2 | 1215 | depends on MODIFY_LDT_SYSCALL |
34273f41 PA |
1216 | ---help--- |
1217 | This option is required by programs like Wine to run 16-bit | |
1218 | protected mode legacy code on x86 processors. Disabling | |
1219 | this option saves about 300 bytes on i386, or around 6K text | |
1220 | plus 16K runtime memory on x86-64, | |
1221 | ||
1222 | config X86_ESPFIX32 | |
1223 | def_bool y | |
1224 | depends on X86_16BIT && X86_32 | |
506f1d07 | 1225 | |
197725de PA |
1226 | config X86_ESPFIX64 |
1227 | def_bool y | |
34273f41 | 1228 | depends on X86_16BIT && X86_64 |
506f1d07 | 1229 | |
1ad83c85 AL |
1230 | config X86_VSYSCALL_EMULATION |
1231 | bool "Enable vsyscall emulation" if EXPERT | |
1232 | default y | |
1233 | depends on X86_64 | |
1234 | ---help--- | |
1235 | This enables emulation of the legacy vsyscall page. Disabling | |
1236 | it is roughly equivalent to booting with vsyscall=none, except | |
1237 | that it will also disable the helpful warning if a program | |
1238 | tries to use a vsyscall. With this option set to N, offending | |
1239 | programs will just segfault, citing addresses of the form | |
1240 | 0xffffffffff600?00. | |
1241 | ||
1242 | This option is required by many programs built before 2013, and | |
1243 | care should be used even with newer programs if set to N. | |
1244 | ||
1245 | Disabling this option saves about 7K of kernel size and | |
1246 | possibly 4K of additional runtime pagetable memory. | |
1247 | ||
506f1d07 SR |
1248 | config TOSHIBA |
1249 | tristate "Toshiba Laptop support" | |
1250 | depends on X86_32 | |
1251 | ---help--- | |
1252 | This adds a driver to safely access the System Management Mode of | |
1253 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | |
1254 | not work on models with a Phoenix BIOS. The System Management Mode | |
1255 | is used to set the BIOS and power saving options on Toshiba portables. | |
1256 | ||
1257 | For information on utilities to make use of this driver see the | |
1258 | Toshiba Linux utilities web site at: | |
1259 | <http://www.buzzard.org.uk/toshiba/>. | |
1260 | ||
1261 | Say Y if you intend to run this kernel on a Toshiba portable. | |
1262 | Say N otherwise. | |
1263 | ||
1264 | config I8K | |
039ae585 | 1265 | tristate "Dell i8k legacy laptop support" |
949a9d70 | 1266 | select HWMON |
039ae585 | 1267 | select SENSORS_DELL_SMM |
506f1d07 | 1268 | ---help--- |
039ae585 PR |
1269 | This option enables legacy /proc/i8k userspace interface in hwmon |
1270 | dell-smm-hwmon driver. Character file /proc/i8k reports bios version, | |
1271 | temperature and allows controlling fan speeds of Dell laptops via | |
1272 | System Management Mode. For old Dell laptops (like Dell Inspiron 8000) | |
1273 | it reports also power and hotkey status. For fan speed control is | |
1274 | needed userspace package i8kutils. | |
1275 | ||
1276 | Say Y if you intend to run this kernel on old Dell laptops or want to | |
1277 | use userspace package i8kutils. | |
506f1d07 SR |
1278 | Say N otherwise. |
1279 | ||
1280 | config X86_REBOOTFIXUPS | |
9ba16087 JB |
1281 | bool "Enable X86 board specific fixups for reboot" |
1282 | depends on X86_32 | |
506f1d07 SR |
1283 | ---help--- |
1284 | This enables chipset and/or board specific fixups to be done | |
1285 | in order to get reboot to work correctly. This is only needed on | |
1286 | some combinations of hardware and BIOS. The symptom, for which | |
1287 | this config is intended, is when reboot ends with a stalled/hung | |
1288 | system. | |
1289 | ||
1290 | Currently, the only fixup is for the Geode machines using | |
5e3a77e9 | 1291 | CS5530A and CS5536 chipsets and the RDC R-321x SoC. |
506f1d07 SR |
1292 | |
1293 | Say Y if you want to enable the fixup. Currently, it's safe to | |
1294 | enable this option even if you don't need it. | |
1295 | Say N otherwise. | |
1296 | ||
1297 | config MICROCODE | |
9a2bc335 BP |
1298 | bool "CPU microcode loading support" |
1299 | default y | |
80030e3d | 1300 | depends on CPU_SUP_AMD || CPU_SUP_INTEL |
506f1d07 SR |
1301 | select FW_LOADER |
1302 | ---help--- | |
1303 | If you say Y here, you will be able to update the microcode on | |
5f9c01aa BP |
1304 | Intel and AMD processors. The Intel support is for the IA32 family, |
1305 | e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, Xeon etc. The | |
1306 | AMD support is for families 0x10 and later. You will obviously need | |
1307 | the actual microcode binary data itself which is not shipped with | |
1308 | the Linux kernel. | |
1309 | ||
1310 | The preferred method to load microcode from a detached initrd is described | |
cb1aaebe | 1311 | in Documentation/x86/microcode.rst. For that you need to enable |
5f9c01aa BP |
1312 | CONFIG_BLK_DEV_INITRD in order for the loader to be able to scan the |
1313 | initrd for microcode blobs. | |
1314 | ||
c508c46e BG |
1315 | In addition, you can build the microcode into the kernel. For that you |
1316 | need to add the vendor-supplied microcode to the CONFIG_EXTRA_FIRMWARE | |
1317 | config option. | |
506f1d07 | 1318 | |
8d86f390 | 1319 | config MICROCODE_INTEL |
e43f6e67 | 1320 | bool "Intel microcode loading support" |
8f9ca475 IM |
1321 | depends on MICROCODE |
1322 | default MICROCODE | |
1323 | select FW_LOADER | |
1324 | ---help--- | |
1325 | This options enables microcode patch loading support for Intel | |
1326 | processors. | |
1327 | ||
b8989db9 A |
1328 | For the current Intel microcode data package go to |
1329 | <https://downloadcenter.intel.com> and search for | |
1330 | 'Linux Processor Microcode Data File'. | |
8d86f390 | 1331 | |
80cc9f10 | 1332 | config MICROCODE_AMD |
e43f6e67 | 1333 | bool "AMD microcode loading support" |
8f9ca475 IM |
1334 | depends on MICROCODE |
1335 | select FW_LOADER | |
1336 | ---help--- | |
1337 | If you select this option, microcode patch loading support for AMD | |
1338 | processors will be enabled. | |
80cc9f10 | 1339 | |
8f9ca475 | 1340 | config MICROCODE_OLD_INTERFACE |
c02f48e0 BP |
1341 | bool "Ancient loading interface (DEPRECATED)" |
1342 | default n | |
506f1d07 | 1343 | depends on MICROCODE |
c02f48e0 BP |
1344 | ---help--- |
1345 | DO NOT USE THIS! This is the ancient /dev/cpu/microcode interface | |
1346 | which was used by userspace tools like iucode_tool and microcode.ctl. | |
1347 | It is inadequate because it runs too late to be able to properly | |
1348 | load microcode on a machine and it needs special tools. Instead, you | |
1349 | should've switched to the early loading method with the initrd or | |
cb1aaebe | 1350 | builtin microcode by now: Documentation/x86/microcode.rst |
506f1d07 SR |
1351 | |
1352 | config X86_MSR | |
1353 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
8f9ca475 | 1354 | ---help--- |
506f1d07 SR |
1355 | This device gives privileged processes access to the x86 |
1356 | Model-Specific Registers (MSRs). It is a character device with | |
1357 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
1358 | MSR accesses are directed to a specific CPU on multi-processor | |
1359 | systems. | |
1360 | ||
1361 | config X86_CPUID | |
1362 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
8f9ca475 | 1363 | ---help--- |
506f1d07 SR |
1364 | This device gives processes access to the x86 CPUID instruction to |
1365 | be executed on a specific processor. It is a character device | |
1366 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
1367 | /dev/cpu/31/cpuid. | |
1368 | ||
1369 | choice | |
1370 | prompt "High Memory Support" | |
6fc108a0 | 1371 | default HIGHMEM4G |
506f1d07 SR |
1372 | depends on X86_32 |
1373 | ||
1374 | config NOHIGHMEM | |
1375 | bool "off" | |
506f1d07 SR |
1376 | ---help--- |
1377 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | |
1378 | However, the address space of 32-bit x86 processors is only 4 | |
1379 | Gigabytes large. That means that, if you have a large amount of | |
1380 | physical memory, not all of it can be "permanently mapped" by the | |
1381 | kernel. The physical memory that's not permanently mapped is called | |
1382 | "high memory". | |
1383 | ||
1384 | If you are compiling a kernel which will never run on a machine with | |
1385 | more than 1 Gigabyte total physical RAM, answer "off" here (default | |
1386 | choice and suitable for most users). This will result in a "3GB/1GB" | |
1387 | split: 3GB are mapped so that each process sees a 3GB virtual memory | |
1388 | space and the remaining part of the 4GB virtual memory space is used | |
1389 | by the kernel to permanently map as much physical memory as | |
1390 | possible. | |
1391 | ||
1392 | If the machine has between 1 and 4 Gigabytes physical RAM, then | |
1393 | answer "4GB" here. | |
1394 | ||
1395 | If more than 4 Gigabytes is used then answer "64GB" here. This | |
1396 | selection turns Intel PAE (Physical Address Extension) mode on. | |
1397 | PAE implements 3-level paging on IA32 processors. PAE is fully | |
1398 | supported by Linux, PAE mode is implemented on all recent Intel | |
1399 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | |
1400 | then the kernel will not boot on CPUs that don't support PAE! | |
1401 | ||
1402 | The actual amount of total physical memory will either be | |
1403 | auto detected or can be forced by using a kernel command line option | |
1404 | such as "mem=256M". (Try "man bootparam" or see the documentation of | |
1405 | your boot loader (lilo or loadlin) about how to pass options to the | |
1406 | kernel at boot time.) | |
1407 | ||
1408 | If unsure, say "off". | |
1409 | ||
1410 | config HIGHMEM4G | |
1411 | bool "4GB" | |
8f9ca475 | 1412 | ---help--- |
506f1d07 SR |
1413 | Select this if you have a 32-bit processor and between 1 and 4 |
1414 | gigabytes of physical RAM. | |
1415 | ||
1416 | config HIGHMEM64G | |
1417 | bool "64GB" | |
69b8d3fc | 1418 | depends on !M486 && !M586 && !M586TSC && !M586MMX && !MGEODE_LX && !MGEODEGX1 && !MCYRIXIII && !MELAN && !MWINCHIPC6 && !WINCHIP3D && !MK6 |
506f1d07 | 1419 | select X86_PAE |
8f9ca475 | 1420 | ---help--- |
506f1d07 SR |
1421 | Select this if you have a 32-bit processor and more than 4 |
1422 | gigabytes of physical RAM. | |
1423 | ||
1424 | endchoice | |
1425 | ||
1426 | choice | |
6a108a14 | 1427 | prompt "Memory split" if EXPERT |
506f1d07 SR |
1428 | default VMSPLIT_3G |
1429 | depends on X86_32 | |
8f9ca475 | 1430 | ---help--- |
506f1d07 SR |
1431 | Select the desired split between kernel and user memory. |
1432 | ||
1433 | If the address range available to the kernel is less than the | |
1434 | physical memory installed, the remaining memory will be available | |
1435 | as "high memory". Accessing high memory is a little more costly | |
1436 | than low memory, as it needs to be mapped into the kernel first. | |
1437 | Note that increasing the kernel address space limits the range | |
1438 | available to user programs, making the address space there | |
1439 | tighter. Selecting anything other than the default 3G/1G split | |
1440 | will also likely make your kernel incompatible with binary-only | |
1441 | kernel modules. | |
1442 | ||
1443 | If you are not absolutely sure what you are doing, leave this | |
1444 | option alone! | |
1445 | ||
1446 | config VMSPLIT_3G | |
1447 | bool "3G/1G user/kernel split" | |
1448 | config VMSPLIT_3G_OPT | |
1449 | depends on !X86_PAE | |
1450 | bool "3G/1G user/kernel split (for full 1G low memory)" | |
1451 | config VMSPLIT_2G | |
1452 | bool "2G/2G user/kernel split" | |
1453 | config VMSPLIT_2G_OPT | |
1454 | depends on !X86_PAE | |
1455 | bool "2G/2G user/kernel split (for full 2G low memory)" | |
1456 | config VMSPLIT_1G | |
1457 | bool "1G/3G user/kernel split" | |
1458 | endchoice | |
1459 | ||
1460 | config PAGE_OFFSET | |
1461 | hex | |
1462 | default 0xB0000000 if VMSPLIT_3G_OPT | |
1463 | default 0x80000000 if VMSPLIT_2G | |
1464 | default 0x78000000 if VMSPLIT_2G_OPT | |
1465 | default 0x40000000 if VMSPLIT_1G | |
1466 | default 0xC0000000 | |
1467 | depends on X86_32 | |
1468 | ||
1469 | config HIGHMEM | |
3c2362e6 | 1470 | def_bool y |
506f1d07 | 1471 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
506f1d07 SR |
1472 | |
1473 | config X86_PAE | |
9ba16087 | 1474 | bool "PAE (Physical Address Extension) Support" |
506f1d07 | 1475 | depends on X86_32 && !HIGHMEM4G |
d4a451d5 | 1476 | select PHYS_ADDR_T_64BIT |
9d99c712 | 1477 | select SWIOTLB |
8f9ca475 | 1478 | ---help--- |
506f1d07 SR |
1479 | PAE is required for NX support, and furthermore enables |
1480 | larger swapspace support for non-overcommit purposes. It | |
1481 | has the cost of more pagetable lookup overhead, and also | |
1482 | consumes more pagetable space per process. | |
1483 | ||
77ef56e4 KS |
1484 | config X86_5LEVEL |
1485 | bool "Enable 5-level page tables support" | |
eedb92ab | 1486 | select DYNAMIC_MEMORY_LAYOUT |
162434e7 | 1487 | select SPARSEMEM_VMEMMAP |
77ef56e4 KS |
1488 | depends on X86_64 |
1489 | ---help--- | |
1490 | 5-level paging enables access to larger address space: | |
1491 | upto 128 PiB of virtual address space and 4 PiB of | |
1492 | physical address space. | |
1493 | ||
1494 | It will be supported by future Intel CPUs. | |
1495 | ||
6657fca0 KS |
1496 | A kernel with the option enabled can be booted on machines that |
1497 | support 4- or 5-level paging. | |
77ef56e4 | 1498 | |
cb1aaebe | 1499 | See Documentation/x86/x86_64/5level-paging.rst for more |
77ef56e4 KS |
1500 | information. |
1501 | ||
1502 | Say N if unsure. | |
1503 | ||
10971ab2 | 1504 | config X86_DIRECT_GBPAGES |
e5008abe | 1505 | def_bool y |
4675ff05 | 1506 | depends on X86_64 && !DEBUG_PAGEALLOC |
8f9ca475 | 1507 | ---help--- |
10971ab2 IM |
1508 | Certain kernel features effectively disable kernel |
1509 | linear 1 GB mappings (even if the CPU otherwise | |
1510 | supports them), so don't confuse the user by printing | |
1511 | that we have them enabled. | |
9e899816 | 1512 | |
5c280cf6 TG |
1513 | config X86_CPA_STATISTICS |
1514 | bool "Enable statistic for Change Page Attribute" | |
1515 | depends on DEBUG_FS | |
1516 | ---help--- | |
1517 | Expose statistics about the Change Page Attribute mechanims, which | |
a943245a | 1518 | helps to determine the effectiveness of preserving large and huge |
5c280cf6 TG |
1519 | page mappings when mapping protections are changed. |
1520 | ||
7744ccdb TL |
1521 | config ARCH_HAS_MEM_ENCRYPT |
1522 | def_bool y | |
1523 | ||
1524 | config AMD_MEM_ENCRYPT | |
1525 | bool "AMD Secure Memory Encryption (SME) support" | |
1526 | depends on X86_64 && CPU_SUP_AMD | |
94d49eb3 | 1527 | select DYNAMIC_PHYSICAL_MASK |
ce9084ba | 1528 | select ARCH_USE_MEMREMAP_PROT |
9087c375 | 1529 | select ARCH_HAS_FORCE_DMA_UNENCRYPTED |
7744ccdb TL |
1530 | ---help--- |
1531 | Say yes to enable support for the encryption of system memory. | |
1532 | This requires an AMD processor that supports Secure Memory | |
1533 | Encryption (SME). | |
1534 | ||
1535 | config AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT | |
1536 | bool "Activate AMD Secure Memory Encryption (SME) by default" | |
1537 | default y | |
1538 | depends on AMD_MEM_ENCRYPT | |
1539 | ---help--- | |
1540 | Say yes to have system memory encrypted by default if running on | |
1541 | an AMD processor that supports Secure Memory Encryption (SME). | |
1542 | ||
1543 | If set to Y, then the encryption of system memory can be | |
1544 | deactivated with the mem_encrypt=off command line option. | |
1545 | ||
1546 | If set to N, then the encryption of system memory can be | |
1547 | activated with the mem_encrypt=on command line option. | |
1548 | ||
506f1d07 SR |
1549 | # Common NUMA Features |
1550 | config NUMA | |
fd51b2d7 | 1551 | bool "Numa Memory Allocation and Scheduler Support" |
506f1d07 | 1552 | depends on SMP |
b5660ba7 PA |
1553 | depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP) |
1554 | default y if X86_BIGSMP | |
8f9ca475 | 1555 | ---help--- |
506f1d07 | 1556 | Enable NUMA (Non Uniform Memory Access) support. |
fd51b2d7 | 1557 | |
506f1d07 SR |
1558 | The kernel will try to allocate memory used by a CPU on the |
1559 | local memory controller of the CPU and add some more | |
1560 | NUMA awareness to the kernel. | |
1561 | ||
c280ea5e | 1562 | For 64-bit this is recommended if the system is Intel Core i7 |
fd51b2d7 KM |
1563 | (or later), AMD Opteron, or EM64T NUMA. |
1564 | ||
b5660ba7 | 1565 | For 32-bit this is only needed if you boot a 32-bit |
7cf6c945 | 1566 | kernel on a 64-bit NUMA platform. |
fd51b2d7 KM |
1567 | |
1568 | Otherwise, you should say N. | |
506f1d07 | 1569 | |
eec1d4fa | 1570 | config AMD_NUMA |
3c2362e6 HH |
1571 | def_bool y |
1572 | prompt "Old style AMD Opteron NUMA detection" | |
5da0ef9a | 1573 | depends on X86_64 && NUMA && PCI |
8f9ca475 | 1574 | ---help--- |
eec1d4fa HR |
1575 | Enable AMD NUMA node topology detection. You should say Y here if |
1576 | you have a multi processor AMD system. This uses an old method to | |
1577 | read the NUMA configuration directly from the builtin Northbridge | |
1578 | of Opteron. It is recommended to use X86_64_ACPI_NUMA instead, | |
1579 | which also takes priority if both are compiled in. | |
506f1d07 SR |
1580 | |
1581 | config X86_64_ACPI_NUMA | |
3c2362e6 HH |
1582 | def_bool y |
1583 | prompt "ACPI NUMA detection" | |
506f1d07 SR |
1584 | depends on X86_64 && NUMA && ACPI && PCI |
1585 | select ACPI_NUMA | |
8f9ca475 | 1586 | ---help--- |
506f1d07 SR |
1587 | Enable ACPI SRAT based node topology detection. |
1588 | ||
6ec6e0d9 SS |
1589 | # Some NUMA nodes have memory ranges that span |
1590 | # other nodes. Even though a pfn is valid and | |
1591 | # between a node's start and end pfns, it may not | |
1592 | # reside on that node. See memmap_init_zone() | |
1593 | # for details. | |
1594 | config NODES_SPAN_OTHER_NODES | |
1595 | def_bool y | |
1596 | depends on X86_64_ACPI_NUMA | |
1597 | ||
506f1d07 SR |
1598 | config NUMA_EMU |
1599 | bool "NUMA emulation" | |
1b7e03ef | 1600 | depends on NUMA |
8f9ca475 | 1601 | ---help--- |
506f1d07 SR |
1602 | Enable NUMA emulation. A flat machine will be split |
1603 | into virtual nodes when booted with "numa=fake=N", where N is the | |
1604 | number of nodes. This is only useful for debugging. | |
1605 | ||
1606 | config NODES_SHIFT | |
d25e26b6 | 1607 | int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP |
51591e31 DR |
1608 | range 1 10 |
1609 | default "10" if MAXSMP | |
506f1d07 | 1610 | default "6" if X86_64 |
506f1d07 SR |
1611 | default "3" |
1612 | depends on NEED_MULTIPLE_NODES | |
8f9ca475 | 1613 | ---help--- |
1184dc2f | 1614 | Specify the maximum number of NUMA Nodes available on the target |
692105b8 | 1615 | system. Increases memory reserved to accommodate various tables. |
506f1d07 | 1616 | |
506f1d07 | 1617 | config ARCH_HAVE_MEMORY_PRESENT |
3c2362e6 | 1618 | def_bool y |
506f1d07 | 1619 | depends on X86_32 && DISCONTIGMEM |
506f1d07 | 1620 | |
506f1d07 SR |
1621 | config ARCH_FLATMEM_ENABLE |
1622 | def_bool y | |
3b16651f | 1623 | depends on X86_32 && !NUMA |
506f1d07 SR |
1624 | |
1625 | config ARCH_DISCONTIGMEM_ENABLE | |
2792107d | 1626 | def_bool n |
b263295d | 1627 | depends on NUMA && X86_32 |
2792107d | 1628 | depends on BROKEN |
b263295d | 1629 | |
506f1d07 SR |
1630 | config ARCH_SPARSEMEM_ENABLE |
1631 | def_bool y | |
6ea30386 | 1632 | depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD |
506f1d07 SR |
1633 | select SPARSEMEM_STATIC if X86_32 |
1634 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 | |
1635 | ||
3b16651f | 1636 | config ARCH_SPARSEMEM_DEFAULT |
6ad57f7f | 1637 | def_bool X86_64 || (NUMA && X86_32) |
3b16651f | 1638 | |
506f1d07 SR |
1639 | config ARCH_SELECT_MEMORY_MODEL |
1640 | def_bool y | |
b263295d | 1641 | depends on ARCH_SPARSEMEM_ENABLE |
506f1d07 SR |
1642 | |
1643 | config ARCH_MEMORY_PROBE | |
a0842b70 | 1644 | bool "Enable sysfs memory/probe interface" |
3120e25e | 1645 | depends on X86_64 && MEMORY_HOTPLUG |
a0842b70 TK |
1646 | help |
1647 | This option enables a sysfs memory/probe interface for testing. | |
cb1aaebe | 1648 | See Documentation/admin-guide/mm/memory-hotplug.rst for more information. |
a0842b70 | 1649 | If you are unsure how to answer this question, answer N. |
506f1d07 | 1650 | |
3b16651f TH |
1651 | config ARCH_PROC_KCORE_TEXT |
1652 | def_bool y | |
1653 | depends on X86_64 && PROC_KCORE | |
1654 | ||
a29815a3 AK |
1655 | config ILLEGAL_POINTER_VALUE |
1656 | hex | |
1657 | default 0 if X86_32 | |
1658 | default 0xdead000000000000 if X86_64 | |
1659 | ||
7a67832c DW |
1660 | config X86_PMEM_LEGACY_DEVICE |
1661 | bool | |
1662 | ||
ec776ef6 | 1663 | config X86_PMEM_LEGACY |
7a67832c | 1664 | tristate "Support non-standard NVDIMMs and ADR protected memory" |
9f53f9fa DW |
1665 | depends on PHYS_ADDR_T_64BIT |
1666 | depends on BLK_DEV | |
7a67832c | 1667 | select X86_PMEM_LEGACY_DEVICE |
9f53f9fa | 1668 | select LIBNVDIMM |
ec776ef6 CH |
1669 | help |
1670 | Treat memory marked using the non-standard e820 type of 12 as used | |
1671 | by the Intel Sandy Bridge-EP reference BIOS as protected memory. | |
1672 | The kernel will offer these regions to the 'pmem' driver so | |
1673 | they can be used for persistent storage. | |
1674 | ||
1675 | Say Y if unsure. | |
1676 | ||
506f1d07 SR |
1677 | config HIGHPTE |
1678 | bool "Allocate 3rd-level pagetables from highmem" | |
6fc108a0 | 1679 | depends on HIGHMEM |
8f9ca475 | 1680 | ---help--- |
506f1d07 SR |
1681 | The VM uses one page table entry for each page of physical memory. |
1682 | For systems with a lot of RAM, this can be wasteful of precious | |
1683 | low memory. Setting this option will put user-space page table | |
1684 | entries in high memory. | |
1685 | ||
9f077871 | 1686 | config X86_CHECK_BIOS_CORRUPTION |
8f9ca475 IM |
1687 | bool "Check for low memory corruption" |
1688 | ---help--- | |
1689 | Periodically check for memory corruption in low memory, which | |
1690 | is suspected to be caused by BIOS. Even when enabled in the | |
1691 | configuration, it is disabled at runtime. Enable it by | |
1692 | setting "memory_corruption_check=1" on the kernel command | |
1693 | line. By default it scans the low 64k of memory every 60 | |
1694 | seconds; see the memory_corruption_check_size and | |
1695 | memory_corruption_check_period parameters in | |
8c27ceff | 1696 | Documentation/admin-guide/kernel-parameters.rst to adjust this. |
8f9ca475 IM |
1697 | |
1698 | When enabled with the default parameters, this option has | |
1699 | almost no overhead, as it reserves a relatively small amount | |
1700 | of memory and scans it infrequently. It both detects corruption | |
1701 | and prevents it from affecting the running system. | |
1702 | ||
1703 | It is, however, intended as a diagnostic tool; if repeatable | |
1704 | BIOS-originated corruption always affects the same memory, | |
1705 | you can use memmap= to prevent the kernel from using that | |
1706 | memory. | |
9f077871 | 1707 | |
c885df50 | 1708 | config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK |
8f9ca475 | 1709 | bool "Set the default setting of memory_corruption_check" |
c885df50 JF |
1710 | depends on X86_CHECK_BIOS_CORRUPTION |
1711 | default y | |
8f9ca475 IM |
1712 | ---help--- |
1713 | Set whether the default state of memory_corruption_check is | |
1714 | on or off. | |
c885df50 | 1715 | |
9ea77bdb | 1716 | config X86_RESERVE_LOW |
d0cd7425 PA |
1717 | int "Amount of low memory, in kilobytes, to reserve for the BIOS" |
1718 | default 64 | |
1719 | range 4 640 | |
8f9ca475 | 1720 | ---help--- |
d0cd7425 PA |
1721 | Specify the amount of low memory to reserve for the BIOS. |
1722 | ||
1723 | The first page contains BIOS data structures that the kernel | |
1724 | must not use, so that page must always be reserved. | |
1725 | ||
1726 | By default we reserve the first 64K of physical RAM, as a | |
1727 | number of BIOSes are known to corrupt that memory range | |
1728 | during events such as suspend/resume or monitor cable | |
1729 | insertion, so it must not be used by the kernel. | |
fc381519 | 1730 | |
d0cd7425 PA |
1731 | You can set this to 4 if you are absolutely sure that you |
1732 | trust the BIOS to get all its memory reservations and usages | |
1733 | right. If you know your BIOS have problems beyond the | |
1734 | default 64K area, you can set this to 640 to avoid using the | |
1735 | entire low memory range. | |
fc381519 | 1736 | |
d0cd7425 PA |
1737 | If you have doubts about the BIOS (e.g. suspend/resume does |
1738 | not work or there's kernel crashes after certain hardware | |
1739 | hotplug events) then you might want to enable | |
1740 | X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check | |
1741 | typical corruption patterns. | |
fc381519 | 1742 | |
d0cd7425 | 1743 | Leave this to the default value of 64 if you are unsure. |
fc381519 | 1744 | |
506f1d07 SR |
1745 | config MATH_EMULATION |
1746 | bool | |
a5b9e5a2 | 1747 | depends on MODIFY_LDT_SYSCALL |
506f1d07 SR |
1748 | prompt "Math emulation" if X86_32 |
1749 | ---help--- | |
1750 | Linux can emulate a math coprocessor (used for floating point | |
1751 | operations) if you don't have one. 486DX and Pentium processors have | |
1752 | a math coprocessor built in, 486SX and 386 do not, unless you added | |
1753 | a 487DX or 387, respectively. (The messages during boot time can | |
1754 | give you some hints here ["man dmesg"].) Everyone needs either a | |
1755 | coprocessor or this emulation. | |
1756 | ||
1757 | If you don't have a math coprocessor, you need to say Y here; if you | |
1758 | say Y here even though you have a coprocessor, the coprocessor will | |
1759 | be used nevertheless. (This behavior can be changed with the kernel | |
1760 | command line option "no387", which comes handy if your coprocessor | |
1761 | is broken. Try "man bootparam" or see the documentation of your boot | |
1762 | loader (lilo or loadlin) about how to pass options to the kernel at | |
1763 | boot time.) This means that it is a good idea to say Y here if you | |
1764 | intend to use this kernel on different machines. | |
1765 | ||
1766 | More information about the internals of the Linux math coprocessor | |
1767 | emulation can be found in <file:arch/x86/math-emu/README>. | |
1768 | ||
1769 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | |
1770 | kernel, it won't hurt. | |
1771 | ||
1772 | config MTRR | |
6fc108a0 | 1773 | def_bool y |
6a108a14 | 1774 | prompt "MTRR (Memory Type Range Register) support" if EXPERT |
506f1d07 SR |
1775 | ---help--- |
1776 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
1777 | the Memory Type Range Registers (MTRRs) may be used to control | |
1778 | processor access to memory ranges. This is most useful if you have | |
1779 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
1780 | allows bus write transfers to be combined into a larger transfer | |
1781 | before bursting over the PCI/AGP bus. This can increase performance | |
1782 | of image write operations 2.5 times or more. Saying Y here creates a | |
1783 | /proc/mtrr file which may be used to manipulate your processor's | |
1784 | MTRRs. Typically the X server should use this. | |
1785 | ||
1786 | This code has a reasonably generic interface so that similar | |
1787 | control registers on other processors can be easily supported | |
1788 | as well: | |
1789 | ||
1790 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | |
1791 | Registers (ARRs) which provide a similar functionality to MTRRs. For | |
1792 | these, the ARRs are used to emulate the MTRRs. | |
1793 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | |
1794 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | |
1795 | write-combining. All of these processors are supported by this code | |
1796 | and it makes sense to say Y here if you have one of them. | |
1797 | ||
1798 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
1799 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
1800 | can lead to all sorts of problems, so it's good to say Y here. | |
1801 | ||
1802 | You can safely say Y even if your machine doesn't have MTRRs, you'll | |
1803 | just add about 9 KB to your kernel. | |
1804 | ||
cb1aaebe | 1805 | See <file:Documentation/x86/mtrr.rst> for more information. |
506f1d07 | 1806 | |
95ffa243 | 1807 | config MTRR_SANITIZER |
2ffb3501 | 1808 | def_bool y |
95ffa243 YL |
1809 | prompt "MTRR cleanup support" |
1810 | depends on MTRR | |
8f9ca475 | 1811 | ---help--- |
aba3728c TG |
1812 | Convert MTRR layout from continuous to discrete, so X drivers can |
1813 | add writeback entries. | |
95ffa243 | 1814 | |
aba3728c | 1815 | Can be disabled with disable_mtrr_cleanup on the kernel command line. |
692105b8 | 1816 | The largest mtrr entry size for a continuous block can be set with |
aba3728c | 1817 | mtrr_chunk_size. |
95ffa243 | 1818 | |
2ffb3501 | 1819 | If unsure, say Y. |
95ffa243 YL |
1820 | |
1821 | config MTRR_SANITIZER_ENABLE_DEFAULT | |
f5098d62 YL |
1822 | int "MTRR cleanup enable value (0-1)" |
1823 | range 0 1 | |
1824 | default "0" | |
95ffa243 | 1825 | depends on MTRR_SANITIZER |
8f9ca475 | 1826 | ---help--- |
f5098d62 | 1827 | Enable mtrr cleanup default value |
95ffa243 | 1828 | |
12031a62 YL |
1829 | config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT |
1830 | int "MTRR cleanup spare reg num (0-7)" | |
1831 | range 0 7 | |
1832 | default "1" | |
1833 | depends on MTRR_SANITIZER | |
8f9ca475 | 1834 | ---help--- |
12031a62 | 1835 | mtrr cleanup spare entries default, it can be changed via |
aba3728c | 1836 | mtrr_spare_reg_nr=N on the kernel command line. |
12031a62 | 1837 | |
2e5d9c85 | 1838 | config X86_PAT |
6fc108a0 | 1839 | def_bool y |
6a108a14 | 1840 | prompt "x86 PAT support" if EXPERT |
2a8a2719 | 1841 | depends on MTRR |
8f9ca475 | 1842 | ---help--- |
2e5d9c85 | 1843 | Use PAT attributes to setup page level cache control. |
042b78e4 | 1844 | |
2e5d9c85 | 1845 | PATs are the modern equivalents of MTRRs and are much more |
1846 | flexible than MTRRs. | |
1847 | ||
1848 | Say N here if you see bootup problems (boot crash, boot hang, | |
042b78e4 | 1849 | spontaneous reboots) or a non-working video driver. |
2e5d9c85 | 1850 | |
1851 | If unsure, say Y. | |
1852 | ||
46cf98cd VP |
1853 | config ARCH_USES_PG_UNCACHED |
1854 | def_bool y | |
1855 | depends on X86_PAT | |
1856 | ||
628c6246 PA |
1857 | config ARCH_RANDOM |
1858 | def_bool y | |
1859 | prompt "x86 architectural random number generator" if EXPERT | |
1860 | ---help--- | |
1861 | Enable the x86 architectural RDRAND instruction | |
1862 | (Intel Bull Mountain technology) to generate random numbers. | |
1863 | If supported, this is a high bandwidth, cryptographically | |
1864 | secure hardware random number generator. | |
1865 | ||
51ae4a2d PA |
1866 | config X86_SMAP |
1867 | def_bool y | |
1868 | prompt "Supervisor Mode Access Prevention" if EXPERT | |
1869 | ---help--- | |
1870 | Supervisor Mode Access Prevention (SMAP) is a security | |
1871 | feature in newer Intel processors. There is a small | |
1872 | performance cost if this enabled and turned on; there is | |
1873 | also a small increase in the kernel size if this is enabled. | |
1874 | ||
1875 | If unsure, say Y. | |
1876 | ||
aa35f896 | 1877 | config X86_INTEL_UMIP |
796ebc81 | 1878 | def_bool y |
aa35f896 RN |
1879 | depends on CPU_SUP_INTEL |
1880 | prompt "Intel User Mode Instruction Prevention" if EXPERT | |
1881 | ---help--- | |
1882 | The User Mode Instruction Prevention (UMIP) is a security | |
1883 | feature in newer Intel processors. If enabled, a general | |
796ebc81 RN |
1884 | protection fault is issued if the SGDT, SLDT, SIDT, SMSW |
1885 | or STR instructions are executed in user mode. These instructions | |
1886 | unnecessarily expose information about the hardware state. | |
1887 | ||
1888 | The vast majority of applications do not use these instructions. | |
1889 | For the very few that do, software emulation is provided in | |
1890 | specific cases in protected and virtual-8086 modes. Emulated | |
1891 | results are dummy. | |
aa35f896 | 1892 | |
72e9b5fe DH |
1893 | config X86_INTEL_MPX |
1894 | prompt "Intel MPX (Memory Protection Extensions)" | |
1895 | def_bool n | |
df3735c5 RR |
1896 | # Note: only available in 64-bit mode due to VMA flags shortage |
1897 | depends on CPU_SUP_INTEL && X86_64 | |
1898 | select ARCH_USES_HIGH_VMA_FLAGS | |
72e9b5fe DH |
1899 | ---help--- |
1900 | MPX provides hardware features that can be used in | |
1901 | conjunction with compiler-instrumented code to check | |
1902 | memory references. It is designed to detect buffer | |
1903 | overflow or underflow bugs. | |
1904 | ||
1905 | This option enables running applications which are | |
1906 | instrumented or otherwise use MPX. It does not use MPX | |
1907 | itself inside the kernel or to protect the kernel | |
1908 | against bad memory references. | |
1909 | ||
1910 | Enabling this option will make the kernel larger: | |
1911 | ~8k of kernel text and 36 bytes of data on a 64-bit | |
1912 | defconfig. It adds a long to the 'mm_struct' which | |
1913 | will increase the kernel memory overhead of each | |
1914 | process and adds some branches to paths used during | |
1915 | exec() and munmap(). | |
1916 | ||
cb1aaebe | 1917 | For details, see Documentation/x86/intel_mpx.rst |
72e9b5fe DH |
1918 | |
1919 | If unsure, say N. | |
1920 | ||
35e97790 | 1921 | config X86_INTEL_MEMORY_PROTECTION_KEYS |
284244a9 | 1922 | prompt "Intel Memory Protection Keys" |
35e97790 | 1923 | def_bool y |
284244a9 | 1924 | # Note: only available in 64-bit mode |
35e97790 | 1925 | depends on CPU_SUP_INTEL && X86_64 |
52c8e601 IM |
1926 | select ARCH_USES_HIGH_VMA_FLAGS |
1927 | select ARCH_HAS_PKEYS | |
284244a9 DH |
1928 | ---help--- |
1929 | Memory Protection Keys provides a mechanism for enforcing | |
1930 | page-based protections, but without requiring modification of the | |
1931 | page tables when an application changes protection domains. | |
1932 | ||
1eecbcdc | 1933 | For details, see Documentation/core-api/protection-keys.rst |
284244a9 DH |
1934 | |
1935 | If unsure, say y. | |
35e97790 | 1936 | |
506f1d07 | 1937 | config EFI |
9ba16087 | 1938 | bool "EFI runtime service support" |
5b83683f | 1939 | depends on ACPI |
f6ce5002 | 1940 | select UCS2_STRING |
022ee6c5 | 1941 | select EFI_RUNTIME_WRAPPERS |
506f1d07 | 1942 | ---help--- |
8f9ca475 IM |
1943 | This enables the kernel to use EFI runtime services that are |
1944 | available (such as the EFI variable services). | |
506f1d07 | 1945 | |
8f9ca475 IM |
1946 | This option is only useful on systems that have EFI firmware. |
1947 | In addition, you should use the latest ELILO loader available | |
1948 | at <http://elilo.sourceforge.net> in order to take advantage | |
1949 | of EFI runtime services. However, even with this option, the | |
1950 | resultant kernel should continue to boot on existing non-EFI | |
1951 | platforms. | |
506f1d07 | 1952 | |
291f3632 MF |
1953 | config EFI_STUB |
1954 | bool "EFI stub support" | |
b16d8c23 | 1955 | depends on EFI && !X86_USE_3DNOW |
7b2a583a | 1956 | select RELOCATABLE |
291f3632 MF |
1957 | ---help--- |
1958 | This kernel feature allows a bzImage to be loaded directly | |
1959 | by EFI firmware without the use of a bootloader. | |
1960 | ||
4f4cfa6c | 1961 | See Documentation/admin-guide/efi-stub.rst for more information. |
0c759662 | 1962 | |
7d453eee MF |
1963 | config EFI_MIXED |
1964 | bool "EFI mixed-mode support" | |
1965 | depends on EFI_STUB && X86_64 | |
1966 | ---help--- | |
1967 | Enabling this feature allows a 64-bit kernel to be booted | |
1968 | on a 32-bit firmware, provided that your CPU supports 64-bit | |
1969 | mode. | |
1970 | ||
1971 | Note that it is not possible to boot a mixed-mode enabled | |
1972 | kernel via the EFI boot stub - a bootloader that supports | |
1973 | the EFI handover protocol must be used. | |
1974 | ||
1975 | If unsure, say N. | |
1976 | ||
506f1d07 | 1977 | config SECCOMP |
3c2362e6 HH |
1978 | def_bool y |
1979 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
8f9ca475 | 1980 | ---help--- |
506f1d07 SR |
1981 | This kernel feature is useful for number crunching applications |
1982 | that may need to compute untrusted bytecode during their | |
1983 | execution. By using pipes or other transports made available to | |
1984 | the process as file descriptors supporting the read/write | |
1985 | syscalls, it's possible to isolate those applications in | |
1986 | their own address space using seccomp. Once seccomp is | |
9c0bbee8 | 1987 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled |
506f1d07 SR |
1988 | and the task is only allowed to execute a few safe syscalls |
1989 | defined by each seccomp mode. | |
1990 | ||
1991 | If unsure, say Y. Only embedded should say N here. | |
1992 | ||
8636a1f9 | 1993 | source "kernel/Kconfig.hz" |
506f1d07 SR |
1994 | |
1995 | config KEXEC | |
1996 | bool "kexec system call" | |
2965faa5 | 1997 | select KEXEC_CORE |
8f9ca475 | 1998 | ---help--- |
506f1d07 SR |
1999 | kexec is a system call that implements the ability to shutdown your |
2000 | current kernel, and to start another kernel. It is like a reboot | |
2001 | but it is independent of the system firmware. And like a reboot | |
2002 | you can start any kernel with it, not just Linux. | |
2003 | ||
2004 | The name comes from the similarity to the exec system call. | |
2005 | ||
2006 | It is an ongoing process to be certain the hardware in a machine | |
2007 | is properly shutdown, so do not be surprised if this code does not | |
bf220695 GU |
2008 | initially work for you. As of this writing the exact hardware |
2009 | interface is strongly in flux, so no good recommendation can be | |
2010 | made. | |
506f1d07 | 2011 | |
74ca317c VG |
2012 | config KEXEC_FILE |
2013 | bool "kexec file based system call" | |
2965faa5 | 2014 | select KEXEC_CORE |
74ca317c | 2015 | select BUILD_BIN2C |
74ca317c VG |
2016 | depends on X86_64 |
2017 | depends on CRYPTO=y | |
2018 | depends on CRYPTO_SHA256=y | |
2019 | ---help--- | |
2020 | This is new version of kexec system call. This system call is | |
2021 | file based and takes file descriptors as system call argument | |
2022 | for kernel and initramfs as opposed to list of segments as | |
2023 | accepted by previous system call. | |
2024 | ||
b799a09f AT |
2025 | config ARCH_HAS_KEXEC_PURGATORY |
2026 | def_bool KEXEC_FILE | |
2027 | ||
8e7d8381 VG |
2028 | config KEXEC_VERIFY_SIG |
2029 | bool "Verify kernel signature during kexec_file_load() syscall" | |
74ca317c | 2030 | depends on KEXEC_FILE |
8e7d8381 VG |
2031 | ---help--- |
2032 | This option makes kernel signature verification mandatory for | |
d8eb8940 BP |
2033 | the kexec_file_load() syscall. |
2034 | ||
2035 | In addition to that option, you need to enable signature | |
2036 | verification for the corresponding kernel image type being | |
2037 | loaded in order for this to work. | |
8e7d8381 VG |
2038 | |
2039 | config KEXEC_BZIMAGE_VERIFY_SIG | |
2040 | bool "Enable bzImage signature verification support" | |
2041 | depends on KEXEC_VERIFY_SIG | |
2042 | depends on SIGNED_PE_FILE_VERIFICATION | |
2043 | select SYSTEM_TRUSTED_KEYRING | |
2044 | ---help--- | |
2045 | Enable bzImage signature verification support. | |
2046 | ||
506f1d07 | 2047 | config CRASH_DUMP |
04b69447 | 2048 | bool "kernel crash dumps" |
506f1d07 | 2049 | depends on X86_64 || (X86_32 && HIGHMEM) |
8f9ca475 | 2050 | ---help--- |
506f1d07 SR |
2051 | Generate crash dump after being started by kexec. |
2052 | This should be normally only set in special crash dump kernels | |
2053 | which are loaded in the main kernel with kexec-tools into | |
2054 | a specially reserved region and then later executed after | |
2055 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
2056 | to a memory address not used by the main kernel or BIOS using | |
2057 | PHYSICAL_START, or it must be built as a relocatable image | |
2058 | (CONFIG_RELOCATABLE=y). | |
330d4810 | 2059 | For more details see Documentation/admin-guide/kdump/kdump.rst |
506f1d07 | 2060 | |
3ab83521 | 2061 | config KEXEC_JUMP |
6ea30386 | 2062 | bool "kexec jump" |
fee7b0d8 | 2063 | depends on KEXEC && HIBERNATION |
8f9ca475 | 2064 | ---help--- |
89081d17 HY |
2065 | Jump between original kernel and kexeced kernel and invoke |
2066 | code in physical address mode via KEXEC | |
3ab83521 | 2067 | |
506f1d07 | 2068 | config PHYSICAL_START |
6a108a14 | 2069 | hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP) |
ceefccc9 | 2070 | default "0x1000000" |
8f9ca475 | 2071 | ---help--- |
506f1d07 SR |
2072 | This gives the physical address where the kernel is loaded. |
2073 | ||
2074 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | |
2075 | bzImage will decompress itself to above physical address and | |
2076 | run from there. Otherwise, bzImage will run from the address where | |
2077 | it has been loaded by the boot loader and will ignore above physical | |
2078 | address. | |
2079 | ||
2080 | In normal kdump cases one does not have to set/change this option | |
2081 | as now bzImage can be compiled as a completely relocatable image | |
2082 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | |
2083 | address. This option is mainly useful for the folks who don't want | |
2084 | to use a bzImage for capturing the crash dump and want to use a | |
2085 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | |
2086 | to be specifically compiled to run from a specific memory area | |
2087 | (normally a reserved region) and this option comes handy. | |
2088 | ||
ceefccc9 PA |
2089 | So if you are using bzImage for capturing the crash dump, |
2090 | leave the value here unchanged to 0x1000000 and set | |
2091 | CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux | |
2092 | for capturing the crash dump change this value to start of | |
2093 | the reserved region. In other words, it can be set based on | |
2094 | the "X" value as specified in the "crashkernel=YM@XM" | |
2095 | command line boot parameter passed to the panic-ed | |
330d4810 | 2096 | kernel. Please take a look at Documentation/admin-guide/kdump/kdump.rst |
ceefccc9 | 2097 | for more details about crash dumps. |
506f1d07 SR |
2098 | |
2099 | Usage of bzImage for capturing the crash dump is recommended as | |
2100 | one does not have to build two kernels. Same kernel can be used | |
2101 | as production kernel and capture kernel. Above option should have | |
2102 | gone away after relocatable bzImage support is introduced. But it | |
2103 | is present because there are users out there who continue to use | |
2104 | vmlinux for dump capture. This option should go away down the | |
2105 | line. | |
2106 | ||
2107 | Don't change this unless you know what you are doing. | |
2108 | ||
2109 | config RELOCATABLE | |
26717808 PA |
2110 | bool "Build a relocatable kernel" |
2111 | default y | |
8f9ca475 | 2112 | ---help--- |
506f1d07 SR |
2113 | This builds a kernel image that retains relocation information |
2114 | so it can be loaded someplace besides the default 1MB. | |
2115 | The relocations tend to make the kernel binary about 10% larger, | |
2116 | but are discarded at runtime. | |
2117 | ||
2118 | One use is for the kexec on panic case where the recovery kernel | |
2119 | must live at a different physical address than the primary | |
2120 | kernel. | |
2121 | ||
2122 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address | |
2123 | it has been loaded at and the compile time physical address | |
8ab3820f | 2124 | (CONFIG_PHYSICAL_START) is used as the minimum location. |
506f1d07 | 2125 | |
8ab3820f | 2126 | config RANDOMIZE_BASE |
e8581e3d | 2127 | bool "Randomize the address of the kernel image (KASLR)" |
8ab3820f | 2128 | depends on RELOCATABLE |
6807c846 | 2129 | default y |
8ab3820f | 2130 | ---help--- |
e8581e3d BH |
2131 | In support of Kernel Address Space Layout Randomization (KASLR), |
2132 | this randomizes the physical address at which the kernel image | |
2133 | is decompressed and the virtual address where the kernel | |
2134 | image is mapped, as a security feature that deters exploit | |
2135 | attempts relying on knowledge of the location of kernel | |
2136 | code internals. | |
2137 | ||
ed9f007e KC |
2138 | On 64-bit, the kernel physical and virtual addresses are |
2139 | randomized separately. The physical address will be anywhere | |
2140 | between 16MB and the top of physical memory (up to 64TB). The | |
2141 | virtual address will be randomized from 16MB up to 1GB (9 bits | |
2142 | of entropy). Note that this also reduces the memory space | |
2143 | available to kernel modules from 1.5GB to 1GB. | |
2144 | ||
2145 | On 32-bit, the kernel physical and virtual addresses are | |
2146 | randomized together. They will be randomized from 16MB up to | |
2147 | 512MB (8 bits of entropy). | |
e8581e3d BH |
2148 | |
2149 | Entropy is generated using the RDRAND instruction if it is | |
2150 | supported. If RDTSC is supported, its value is mixed into | |
2151 | the entropy pool as well. If neither RDRAND nor RDTSC are | |
ed9f007e KC |
2152 | supported, then entropy is read from the i8254 timer. The |
2153 | usable entropy is limited by the kernel being built using | |
2154 | 2GB addressing, and that PHYSICAL_ALIGN must be at a | |
2155 | minimum of 2MB. As a result, only 10 bits of entropy are | |
2156 | theoretically possible, but the implementations are further | |
2157 | limited due to memory layouts. | |
e8581e3d | 2158 | |
6807c846 | 2159 | If unsure, say Y. |
8ab3820f KC |
2160 | |
2161 | # Relocation on x86 needs some additional build support | |
845adf72 PA |
2162 | config X86_NEED_RELOCS |
2163 | def_bool y | |
8ab3820f | 2164 | depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE) |
845adf72 | 2165 | |
506f1d07 | 2166 | config PHYSICAL_ALIGN |
a0215061 | 2167 | hex "Alignment value to which kernel should be aligned" |
8ab3820f | 2168 | default "0x200000" |
a0215061 KC |
2169 | range 0x2000 0x1000000 if X86_32 |
2170 | range 0x200000 0x1000000 if X86_64 | |
8f9ca475 | 2171 | ---help--- |
506f1d07 SR |
2172 | This value puts the alignment restrictions on physical address |
2173 | where kernel is loaded and run from. Kernel is compiled for an | |
2174 | address which meets above alignment restriction. | |
2175 | ||
2176 | If bootloader loads the kernel at a non-aligned address and | |
2177 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | |
2178 | address aligned to above value and run from there. | |
2179 | ||
2180 | If bootloader loads the kernel at a non-aligned address and | |
2181 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | |
2182 | load address and decompress itself to the address it has been | |
2183 | compiled for and run from there. The address for which kernel is | |
2184 | compiled already meets above alignment restrictions. Hence the | |
2185 | end result is that kernel runs from a physical address meeting | |
2186 | above alignment restrictions. | |
2187 | ||
a0215061 KC |
2188 | On 32-bit this value must be a multiple of 0x2000. On 64-bit |
2189 | this value must be a multiple of 0x200000. | |
2190 | ||
506f1d07 SR |
2191 | Don't change this unless you know what you are doing. |
2192 | ||
eedb92ab KS |
2193 | config DYNAMIC_MEMORY_LAYOUT |
2194 | bool | |
2195 | ---help--- | |
2196 | This option makes base addresses of vmalloc and vmemmap as well as | |
2197 | __PAGE_OFFSET movable during boot. | |
2198 | ||
0483e1fa TG |
2199 | config RANDOMIZE_MEMORY |
2200 | bool "Randomize the kernel memory sections" | |
2201 | depends on X86_64 | |
2202 | depends on RANDOMIZE_BASE | |
eedb92ab | 2203 | select DYNAMIC_MEMORY_LAYOUT |
0483e1fa TG |
2204 | default RANDOMIZE_BASE |
2205 | ---help--- | |
2206 | Randomizes the base virtual address of kernel memory sections | |
2207 | (physical memory mapping, vmalloc & vmemmap). This security feature | |
2208 | makes exploits relying on predictable memory locations less reliable. | |
2209 | ||
2210 | The order of allocations remains unchanged. Entropy is generated in | |
2211 | the same way as RANDOMIZE_BASE. Current implementation in the optimal | |
2212 | configuration have in average 30,000 different possible virtual | |
2213 | addresses for each memory section. | |
2214 | ||
6807c846 | 2215 | If unsure, say Y. |
0483e1fa | 2216 | |
90397a41 TG |
2217 | config RANDOMIZE_MEMORY_PHYSICAL_PADDING |
2218 | hex "Physical memory mapping padding" if EXPERT | |
2219 | depends on RANDOMIZE_MEMORY | |
2220 | default "0xa" if MEMORY_HOTPLUG | |
2221 | default "0x0" | |
2222 | range 0x1 0x40 if MEMORY_HOTPLUG | |
2223 | range 0x0 0x40 | |
2224 | ---help--- | |
2225 | Define the padding in terabytes added to the existing physical | |
2226 | memory size during kernel memory randomization. It is useful | |
2227 | for memory hotplug support but reduces the entropy available for | |
2228 | address randomization. | |
2229 | ||
2230 | If unsure, leave at the default value. | |
2231 | ||
506f1d07 | 2232 | config HOTPLUG_CPU |
bebd024e | 2233 | def_bool y |
40b31360 | 2234 | depends on SMP |
506f1d07 | 2235 | |
80aa1dff FY |
2236 | config BOOTPARAM_HOTPLUG_CPU0 |
2237 | bool "Set default setting of cpu0_hotpluggable" | |
2c922cd0 | 2238 | depends on HOTPLUG_CPU |
80aa1dff FY |
2239 | ---help--- |
2240 | Set whether default state of cpu0_hotpluggable is on or off. | |
2241 | ||
2242 | Say Y here to enable CPU0 hotplug by default. If this switch | |
2243 | is turned on, there is no need to give cpu0_hotplug kernel | |
2244 | parameter and the CPU0 hotplug feature is enabled by default. | |
2245 | ||
2246 | Please note: there are two known CPU0 dependencies if you want | |
2247 | to enable the CPU0 hotplug feature either by this switch or by | |
2248 | cpu0_hotplug kernel parameter. | |
2249 | ||
2250 | First, resume from hibernate or suspend always starts from CPU0. | |
2251 | So hibernate and suspend are prevented if CPU0 is offline. | |
2252 | ||
2253 | Second dependency is PIC interrupts always go to CPU0. CPU0 can not | |
2254 | offline if any interrupt can not migrate out of CPU0. There may | |
2255 | be other CPU0 dependencies. | |
2256 | ||
2257 | Please make sure the dependencies are under your control before | |
2258 | you enable this feature. | |
2259 | ||
2260 | Say N if you don't want to enable CPU0 hotplug feature by default. | |
2261 | You still can enable the CPU0 hotplug feature at boot by kernel | |
2262 | parameter cpu0_hotplug. | |
2263 | ||
a71c8bc5 FY |
2264 | config DEBUG_HOTPLUG_CPU0 |
2265 | def_bool n | |
2266 | prompt "Debug CPU0 hotplug" | |
2c922cd0 | 2267 | depends on HOTPLUG_CPU |
a71c8bc5 FY |
2268 | ---help--- |
2269 | Enabling this option offlines CPU0 (if CPU0 can be offlined) as | |
2270 | soon as possible and boots up userspace with CPU0 offlined. User | |
2271 | can online CPU0 back after boot time. | |
2272 | ||
2273 | To debug CPU0 hotplug, you need to enable CPU0 offline/online | |
2274 | feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during | |
2275 | compilation or giving cpu0_hotplug kernel parameter at boot. | |
2276 | ||
2277 | If unsure, say N. | |
2278 | ||
506f1d07 | 2279 | config COMPAT_VDSO |
b0b49f26 AL |
2280 | def_bool n |
2281 | prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)" | |
953fee1d | 2282 | depends on COMPAT_32 |
8f9ca475 | 2283 | ---help--- |
b0b49f26 AL |
2284 | Certain buggy versions of glibc will crash if they are |
2285 | presented with a 32-bit vDSO that is not mapped at the address | |
2286 | indicated in its segment table. | |
e84446de | 2287 | |
b0b49f26 AL |
2288 | The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a |
2289 | and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and | |
2290 | 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is | |
2291 | the only released version with the bug, but OpenSUSE 9 | |
2292 | contains a buggy "glibc 2.3.2". | |
506f1d07 | 2293 | |
b0b49f26 AL |
2294 | The symptom of the bug is that everything crashes on startup, saying: |
2295 | dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed! | |
2296 | ||
2297 | Saying Y here changes the default value of the vdso32 boot | |
2298 | option from 1 to 0, which turns off the 32-bit vDSO entirely. | |
2299 | This works around the glibc bug but hurts performance. | |
2300 | ||
2301 | If unsure, say N: if you are compiling your own kernel, you | |
2302 | are unlikely to be using a buggy version of glibc. | |
506f1d07 | 2303 | |
3dc33bd3 KC |
2304 | choice |
2305 | prompt "vsyscall table for legacy applications" | |
2306 | depends on X86_64 | |
625b7b7f | 2307 | default LEGACY_VSYSCALL_XONLY |
3dc33bd3 KC |
2308 | help |
2309 | Legacy user code that does not know how to find the vDSO expects | |
2310 | to be able to issue three syscalls by calling fixed addresses in | |
2311 | kernel space. Since this location is not randomized with ASLR, | |
2312 | it can be used to assist security vulnerability exploitation. | |
2313 | ||
2314 | This setting can be changed at boot time via the kernel command | |
bd49e16e | 2315 | line parameter vsyscall=[emulate|xonly|none]. |
3dc33bd3 KC |
2316 | |
2317 | On a system with recent enough glibc (2.14 or newer) and no | |
2318 | static binaries, you can say None without a performance penalty | |
2319 | to improve security. | |
2320 | ||
bd49e16e | 2321 | If unsure, select "Emulate execution only". |
3dc33bd3 | 2322 | |
3dc33bd3 | 2323 | config LEGACY_VSYSCALL_EMULATE |
bd49e16e | 2324 | bool "Full emulation" |
3dc33bd3 | 2325 | help |
bd49e16e AL |
2326 | The kernel traps and emulates calls into the fixed vsyscall |
2327 | address mapping. This makes the mapping non-executable, but | |
2328 | it still contains readable known contents, which could be | |
2329 | used in certain rare security vulnerability exploits. This | |
2330 | configuration is recommended when using legacy userspace | |
2331 | that still uses vsyscalls along with legacy binary | |
2332 | instrumentation tools that require code to be readable. | |
2333 | ||
2334 | An example of this type of legacy userspace is running | |
2335 | Pin on an old binary that still uses vsyscalls. | |
2336 | ||
2337 | config LEGACY_VSYSCALL_XONLY | |
2338 | bool "Emulate execution only" | |
2339 | help | |
2340 | The kernel traps and emulates calls into the fixed vsyscall | |
2341 | address mapping and does not allow reads. This | |
2342 | configuration is recommended when userspace might use the | |
2343 | legacy vsyscall area but support for legacy binary | |
2344 | instrumentation of legacy code is not needed. It mitigates | |
2345 | certain uses of the vsyscall area as an ASLR-bypassing | |
2346 | buffer. | |
3dc33bd3 KC |
2347 | |
2348 | config LEGACY_VSYSCALL_NONE | |
2349 | bool "None" | |
2350 | help | |
2351 | There will be no vsyscall mapping at all. This will | |
2352 | eliminate any risk of ASLR bypass due to the vsyscall | |
2353 | fixed address mapping. Attempts to use the vsyscalls | |
2354 | will be reported to dmesg, so that either old or | |
2355 | malicious userspace programs can be identified. | |
2356 | ||
2357 | endchoice | |
2358 | ||
516cbf37 TB |
2359 | config CMDLINE_BOOL |
2360 | bool "Built-in kernel command line" | |
8f9ca475 | 2361 | ---help--- |
516cbf37 TB |
2362 | Allow for specifying boot arguments to the kernel at |
2363 | build time. On some systems (e.g. embedded ones), it is | |
2364 | necessary or convenient to provide some or all of the | |
2365 | kernel boot arguments with the kernel itself (that is, | |
2366 | to not rely on the boot loader to provide them.) | |
2367 | ||
2368 | To compile command line arguments into the kernel, | |
2369 | set this option to 'Y', then fill in the | |
69711ca1 | 2370 | boot arguments in CONFIG_CMDLINE. |
516cbf37 TB |
2371 | |
2372 | Systems with fully functional boot loaders (i.e. non-embedded) | |
2373 | should leave this option set to 'N'. | |
2374 | ||
2375 | config CMDLINE | |
2376 | string "Built-in kernel command string" | |
2377 | depends on CMDLINE_BOOL | |
2378 | default "" | |
8f9ca475 | 2379 | ---help--- |
516cbf37 TB |
2380 | Enter arguments here that should be compiled into the kernel |
2381 | image and used at boot time. If the boot loader provides a | |
2382 | command line at boot time, it is appended to this string to | |
2383 | form the full kernel command line, when the system boots. | |
2384 | ||
2385 | However, you can use the CONFIG_CMDLINE_OVERRIDE option to | |
2386 | change this behavior. | |
2387 | ||
2388 | In most cases, the command line (whether built-in or provided | |
2389 | by the boot loader) should specify the device for the root | |
2390 | file system. | |
2391 | ||
2392 | config CMDLINE_OVERRIDE | |
2393 | bool "Built-in command line overrides boot loader arguments" | |
516cbf37 | 2394 | depends on CMDLINE_BOOL |
8f9ca475 | 2395 | ---help--- |
516cbf37 TB |
2396 | Set this option to 'Y' to have the kernel ignore the boot loader |
2397 | command line, and use ONLY the built-in command line. | |
2398 | ||
2399 | This is used to work around broken boot loaders. This should | |
2400 | be set to 'N' under normal conditions. | |
2401 | ||
a5b9e5a2 AL |
2402 | config MODIFY_LDT_SYSCALL |
2403 | bool "Enable the LDT (local descriptor table)" if EXPERT | |
2404 | default y | |
2405 | ---help--- | |
2406 | Linux can allow user programs to install a per-process x86 | |
2407 | Local Descriptor Table (LDT) using the modify_ldt(2) system | |
2408 | call. This is required to run 16-bit or segmented code such as | |
2409 | DOSEMU or some Wine programs. It is also used by some very old | |
2410 | threading libraries. | |
2411 | ||
2412 | Enabling this feature adds a small amount of overhead to | |
2413 | context switches and increases the low-level kernel attack | |
2414 | surface. Disabling it removes the modify_ldt(2) system call. | |
2415 | ||
2416 | Saying 'N' here may make sense for embedded or server kernels. | |
2417 | ||
b700e7f0 SJ |
2418 | source "kernel/livepatch/Kconfig" |
2419 | ||
506f1d07 SR |
2420 | endmenu |
2421 | ||
3072e413 MH |
2422 | config ARCH_HAS_ADD_PAGES |
2423 | def_bool y | |
2424 | depends on X86_64 && ARCH_ENABLE_MEMORY_HOTPLUG | |
2425 | ||
506f1d07 SR |
2426 | config ARCH_ENABLE_MEMORY_HOTPLUG |
2427 | def_bool y | |
2428 | depends on X86_64 || (X86_32 && HIGHMEM) | |
2429 | ||
35551053 GH |
2430 | config ARCH_ENABLE_MEMORY_HOTREMOVE |
2431 | def_bool y | |
2432 | depends on MEMORY_HOTPLUG | |
2433 | ||
e534c7c5 | 2434 | config USE_PERCPU_NUMA_NODE_ID |
645a7919 | 2435 | def_bool y |
e534c7c5 LS |
2436 | depends on NUMA |
2437 | ||
9491846f KS |
2438 | config ARCH_ENABLE_SPLIT_PMD_PTLOCK |
2439 | def_bool y | |
2440 | depends on X86_64 || X86_PAE | |
2441 | ||
c177c81e NH |
2442 | config ARCH_ENABLE_HUGEPAGE_MIGRATION |
2443 | def_bool y | |
2444 | depends on X86_64 && HUGETLB_PAGE && MIGRATION | |
2445 | ||
9c670ea3 NH |
2446 | config ARCH_ENABLE_THP_MIGRATION |
2447 | def_bool y | |
2448 | depends on X86_64 && TRANSPARENT_HUGEPAGE | |
2449 | ||
da85f865 | 2450 | menu "Power management and ACPI options" |
e279b6c1 SR |
2451 | |
2452 | config ARCH_HIBERNATION_HEADER | |
3c2362e6 | 2453 | def_bool y |
44556530 | 2454 | depends on HIBERNATION |
e279b6c1 SR |
2455 | |
2456 | source "kernel/power/Kconfig" | |
2457 | ||
2458 | source "drivers/acpi/Kconfig" | |
2459 | ||
efafc8b2 FT |
2460 | source "drivers/sfi/Kconfig" |
2461 | ||
a6b68076 | 2462 | config X86_APM_BOOT |
6fc108a0 | 2463 | def_bool y |
282e5aab | 2464 | depends on APM |
a6b68076 | 2465 | |
e279b6c1 SR |
2466 | menuconfig APM |
2467 | tristate "APM (Advanced Power Management) BIOS support" | |
efefa6f6 | 2468 | depends on X86_32 && PM_SLEEP |
e279b6c1 SR |
2469 | ---help--- |
2470 | APM is a BIOS specification for saving power using several different | |
2471 | techniques. This is mostly useful for battery powered laptops with | |
2472 | APM compliant BIOSes. If you say Y here, the system time will be | |
2473 | reset after a RESUME operation, the /proc/apm device will provide | |
2474 | battery status information, and user-space programs will receive | |
2475 | notification of APM "events" (e.g. battery status change). | |
2476 | ||
2477 | If you select "Y" here, you can disable actual use of the APM | |
2478 | BIOS by passing the "apm=off" option to the kernel at boot time. | |
2479 | ||
2480 | Note that the APM support is almost completely disabled for | |
2481 | machines with more than one CPU. | |
2482 | ||
2483 | In order to use APM, you will need supporting software. For location | |
151f4e2b | 2484 | and more information, read <file:Documentation/power/apm-acpi.rst> |
2dc98fd3 | 2485 | and the Battery Powered Linux mini-HOWTO, available from |
e279b6c1 SR |
2486 | <http://www.tldp.org/docs.html#howto>. |
2487 | ||
2488 | This driver does not spin down disk drives (see the hdparm(8) | |
2489 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
2490 | VESA-compliant "green" monitors. | |
2491 | ||
2492 | This driver does not support the TI 4000M TravelMate and the ACER | |
2493 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" | |
2494 | desktop machines also don't have compliant BIOSes, and this driver | |
2495 | may cause those machines to panic during the boot phase. | |
2496 | ||
2497 | Generally, if you don't have a battery in your machine, there isn't | |
2498 | much point in using this driver and you should say N. If you get | |
2499 | random kernel OOPSes or reboots that don't seem to be related to | |
2500 | anything, try disabling/enabling this option (or disabling/enabling | |
2501 | APM in your BIOS). | |
2502 | ||
2503 | Some other things you should try when experiencing seemingly random, | |
2504 | "weird" problems: | |
2505 | ||
2506 | 1) make sure that you have enough swap space and that it is | |
2507 | enabled. | |
2508 | 2) pass the "no-hlt" option to the kernel | |
2509 | 3) switch on floating point emulation in the kernel and pass | |
2510 | the "no387" option to the kernel | |
2511 | 4) pass the "floppy=nodma" option to the kernel | |
2512 | 5) pass the "mem=4M" option to the kernel (thereby disabling | |
2513 | all but the first 4 MB of RAM) | |
2514 | 6) make sure that the CPU is not over clocked. | |
2515 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> | |
2516 | 8) disable the cache from your BIOS settings | |
2517 | 9) install a fan for the video card or exchange video RAM | |
2518 | 10) install a better fan for the CPU | |
2519 | 11) exchange RAM chips | |
2520 | 12) exchange the motherboard. | |
2521 | ||
2522 | To compile this driver as a module, choose M here: the | |
2523 | module will be called apm. | |
2524 | ||
2525 | if APM | |
2526 | ||
2527 | config APM_IGNORE_USER_SUSPEND | |
2528 | bool "Ignore USER SUSPEND" | |
8f9ca475 | 2529 | ---help--- |
e279b6c1 SR |
2530 | This option will ignore USER SUSPEND requests. On machines with a |
2531 | compliant APM BIOS, you want to say N. However, on the NEC Versa M | |
2532 | series notebooks, it is necessary to say Y because of a BIOS bug. | |
2533 | ||
2534 | config APM_DO_ENABLE | |
2535 | bool "Enable PM at boot time" | |
2536 | ---help--- | |
2537 | Enable APM features at boot time. From page 36 of the APM BIOS | |
2538 | specification: "When disabled, the APM BIOS does not automatically | |
2539 | power manage devices, enter the Standby State, enter the Suspend | |
2540 | State, or take power saving steps in response to CPU Idle calls." | |
2541 | This driver will make CPU Idle calls when Linux is idle (unless this | |
2542 | feature is turned off -- see "Do CPU IDLE calls", below). This | |
2543 | should always save battery power, but more complicated APM features | |
2544 | will be dependent on your BIOS implementation. You may need to turn | |
2545 | this option off if your computer hangs at boot time when using APM | |
2546 | support, or if it beeps continuously instead of suspending. Turn | |
2547 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba | |
2548 | T400CDT. This is off by default since most machines do fine without | |
2549 | this feature. | |
2550 | ||
2551 | config APM_CPU_IDLE | |
dd8af076 | 2552 | depends on CPU_IDLE |
e279b6c1 | 2553 | bool "Make CPU Idle calls when idle" |
8f9ca475 | 2554 | ---help--- |
e279b6c1 SR |
2555 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. |
2556 | On some machines, this can activate improved power savings, such as | |
2557 | a slowed CPU clock rate, when the machine is idle. These idle calls | |
2558 | are made after the idle loop has run for some length of time (e.g., | |
2559 | 333 mS). On some machines, this will cause a hang at boot time or | |
2560 | whenever the CPU becomes idle. (On machines with more than one CPU, | |
2561 | this option does nothing.) | |
2562 | ||
2563 | config APM_DISPLAY_BLANK | |
2564 | bool "Enable console blanking using APM" | |
8f9ca475 | 2565 | ---help--- |
e279b6c1 SR |
2566 | Enable console blanking using the APM. Some laptops can use this to |
2567 | turn off the LCD backlight when the screen blanker of the Linux | |
2568 | virtual console blanks the screen. Note that this is only used by | |
2569 | the virtual console screen blanker, and won't turn off the backlight | |
2570 | when using the X Window system. This also doesn't have anything to | |
2571 | do with your VESA-compliant power-saving monitor. Further, this | |
2572 | option doesn't work for all laptops -- it might not turn off your | |
2573 | backlight at all, or it might print a lot of errors to the console, | |
2574 | especially if you are using gpm. | |
2575 | ||
2576 | config APM_ALLOW_INTS | |
2577 | bool "Allow interrupts during APM BIOS calls" | |
8f9ca475 | 2578 | ---help--- |
e279b6c1 SR |
2579 | Normally we disable external interrupts while we are making calls to |
2580 | the APM BIOS as a measure to lessen the effects of a badly behaving | |
2581 | BIOS implementation. The BIOS should reenable interrupts if it | |
2582 | needs to. Unfortunately, some BIOSes do not -- especially those in | |
2583 | many of the newer IBM Thinkpads. If you experience hangs when you | |
2584 | suspend, try setting this to Y. Otherwise, say N. | |
2585 | ||
e279b6c1 SR |
2586 | endif # APM |
2587 | ||
bb0a56ec | 2588 | source "drivers/cpufreq/Kconfig" |
e279b6c1 SR |
2589 | |
2590 | source "drivers/cpuidle/Kconfig" | |
2591 | ||
27471fdb AH |
2592 | source "drivers/idle/Kconfig" |
2593 | ||
e279b6c1 SR |
2594 | endmenu |
2595 | ||
2596 | ||
2597 | menu "Bus options (PCI etc.)" | |
2598 | ||
e279b6c1 SR |
2599 | choice |
2600 | prompt "PCI access mode" | |
efefa6f6 | 2601 | depends on X86_32 && PCI |
e279b6c1 SR |
2602 | default PCI_GOANY |
2603 | ---help--- | |
2604 | On PCI systems, the BIOS can be used to detect the PCI devices and | |
2605 | determine their configuration. However, some old PCI motherboards | |
2606 | have BIOS bugs and may crash if this is done. Also, some embedded | |
2607 | PCI-based systems don't have any BIOS at all. Linux can also try to | |
2608 | detect the PCI hardware directly without using the BIOS. | |
2609 | ||
2610 | With this option, you can specify how Linux should detect the | |
2611 | PCI devices. If you choose "BIOS", the BIOS will be used, | |
2612 | if you choose "Direct", the BIOS won't be used, and if you | |
2613 | choose "MMConfig", then PCI Express MMCONFIG will be used. | |
2614 | If you choose "Any", the kernel will try MMCONFIG, then the | |
2615 | direct access method and falls back to the BIOS if that doesn't | |
2616 | work. If unsure, go with the default, which is "Any". | |
2617 | ||
2618 | config PCI_GOBIOS | |
2619 | bool "BIOS" | |
2620 | ||
2621 | config PCI_GOMMCONFIG | |
2622 | bool "MMConfig" | |
2623 | ||
2624 | config PCI_GODIRECT | |
2625 | bool "Direct" | |
2626 | ||
3ef0e1f8 | 2627 | config PCI_GOOLPC |
76fb6570 | 2628 | bool "OLPC XO-1" |
3ef0e1f8 AS |
2629 | depends on OLPC |
2630 | ||
2bdd1b03 AS |
2631 | config PCI_GOANY |
2632 | bool "Any" | |
2633 | ||
e279b6c1 SR |
2634 | endchoice |
2635 | ||
2636 | config PCI_BIOS | |
3c2362e6 | 2637 | def_bool y |
efefa6f6 | 2638 | depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) |
e279b6c1 SR |
2639 | |
2640 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. | |
2641 | config PCI_DIRECT | |
3c2362e6 | 2642 | def_bool y |
0aba496f | 2643 | depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG)) |
e279b6c1 SR |
2644 | |
2645 | config PCI_MMCONFIG | |
b45c9f36 JK |
2646 | bool "Support mmconfig PCI config space access" if X86_64 |
2647 | default y | |
8364e1f8 | 2648 | depends on PCI && (ACPI || SFI || JAILHOUSE_GUEST) |
b45c9f36 | 2649 | depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG) |
e279b6c1 | 2650 | |
3ef0e1f8 | 2651 | config PCI_OLPC |
2bdd1b03 AS |
2652 | def_bool y |
2653 | depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) | |
3ef0e1f8 | 2654 | |
b5401a96 AN |
2655 | config PCI_XEN |
2656 | def_bool y | |
2657 | depends on PCI && XEN | |
2658 | select SWIOTLB_XEN | |
2659 | ||
8364e1f8 JK |
2660 | config MMCONF_FAM10H |
2661 | def_bool y | |
2662 | depends on X86_64 && PCI_MMCONFIG && ACPI | |
e279b6c1 | 2663 | |
3f6ea84a | 2664 | config PCI_CNB20LE_QUIRK |
6a108a14 | 2665 | bool "Read CNB20LE Host Bridge Windows" if EXPERT |
6ea30386 | 2666 | depends on PCI |
3f6ea84a IS |
2667 | help |
2668 | Read the PCI windows out of the CNB20LE host bridge. This allows | |
2669 | PCI hotplug to work on systems with the CNB20LE chipset which do | |
2670 | not have ACPI. | |
2671 | ||
64a5fed6 BH |
2672 | There's no public spec for this chipset, and this functionality |
2673 | is known to be incomplete. | |
2674 | ||
2675 | You should say N unless you know you need this. | |
2676 | ||
3a495511 | 2677 | config ISA_BUS |
17a2a129 | 2678 | bool "ISA bus support on modern systems" if EXPERT |
3a495511 | 2679 | help |
17a2a129 WBG |
2680 | Expose ISA bus device drivers and options available for selection and |
2681 | configuration. Enable this option if your target machine has an ISA | |
2682 | bus. ISA is an older system, displaced by PCI and newer bus | |
2683 | architectures -- if your target machine is modern, it probably does | |
2684 | not have an ISA bus. | |
3a495511 WBG |
2685 | |
2686 | If unsure, say N. | |
2687 | ||
1c00f016 | 2688 | # x86_64 have no ISA slots, but can have ISA-style DMA. |
e279b6c1 | 2689 | config ISA_DMA_API |
1c00f016 DR |
2690 | bool "ISA-style DMA support" if (X86_64 && EXPERT) |
2691 | default y | |
2692 | help | |
2693 | Enables ISA-style DMA support for devices requiring such controllers. | |
2694 | If unsure, say Y. | |
e279b6c1 | 2695 | |
51e68d05 LT |
2696 | if X86_32 |
2697 | ||
e279b6c1 SR |
2698 | config ISA |
2699 | bool "ISA support" | |
8f9ca475 | 2700 | ---help--- |
e279b6c1 SR |
2701 | Find out whether you have ISA slots on your motherboard. ISA is the |
2702 | name of a bus system, i.e. the way the CPU talks to the other stuff | |
2703 | inside your box. Other bus systems are PCI, EISA, MicroChannel | |
2704 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; | |
2705 | newer boards don't support it. If you have ISA, say Y, otherwise N. | |
2706 | ||
e279b6c1 SR |
2707 | config SCx200 |
2708 | tristate "NatSemi SCx200 support" | |
8f9ca475 | 2709 | ---help--- |
e279b6c1 SR |
2710 | This provides basic support for National Semiconductor's |
2711 | (now AMD's) Geode processors. The driver probes for the | |
2712 | PCI-IDs of several on-chip devices, so its a good dependency | |
2713 | for other scx200_* drivers. | |
2714 | ||
2715 | If compiled as a module, the driver is named scx200. | |
2716 | ||
2717 | config SCx200HR_TIMER | |
2718 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" | |
592913ec | 2719 | depends on SCx200 |
e279b6c1 | 2720 | default y |
8f9ca475 | 2721 | ---help--- |
e279b6c1 SR |
2722 | This driver provides a clocksource built upon the on-chip |
2723 | 27MHz high-resolution timer. Its also a workaround for | |
2724 | NSC Geode SC-1100's buggy TSC, which loses time when the | |
2725 | processor goes idle (as is done by the scheduler). The | |
2726 | other workaround is idle=poll boot option. | |
2727 | ||
3ef0e1f8 AS |
2728 | config OLPC |
2729 | bool "One Laptop Per Child support" | |
54008979 | 2730 | depends on !X86_PAE |
3c554946 | 2731 | select GPIOLIB |
dc3119e7 | 2732 | select OF |
45bb1674 | 2733 | select OF_PROMTREE |
b4e51854 | 2734 | select IRQ_DOMAIN |
0c3d931b | 2735 | select OLPC_EC |
8f9ca475 | 2736 | ---help--- |
3ef0e1f8 AS |
2737 | Add support for detecting the unique features of the OLPC |
2738 | XO hardware. | |
2739 | ||
a3128588 DD |
2740 | config OLPC_XO1_PM |
2741 | bool "OLPC XO-1 Power Management" | |
fa112cf1 | 2742 | depends on OLPC && MFD_CS5535=y && PM_SLEEP |
bf1ebf00 | 2743 | ---help--- |
97c4cb71 | 2744 | Add support for poweroff and suspend of the OLPC XO-1 laptop. |
bf1ebf00 | 2745 | |
cfee9597 DD |
2746 | config OLPC_XO1_RTC |
2747 | bool "OLPC XO-1 Real Time Clock" | |
2748 | depends on OLPC_XO1_PM && RTC_DRV_CMOS | |
2749 | ---help--- | |
2750 | Add support for the XO-1 real time clock, which can be used as a | |
2751 | programmable wakeup source. | |
2752 | ||
7feda8e9 DD |
2753 | config OLPC_XO1_SCI |
2754 | bool "OLPC XO-1 SCI extras" | |
92e830f2 | 2755 | depends on OLPC && OLPC_XO1_PM && GPIO_CS5535=y |
ed8e47fe | 2756 | depends on INPUT=y |
d8d01a63 | 2757 | select POWER_SUPPLY |
7feda8e9 DD |
2758 | ---help--- |
2759 | Add support for SCI-based features of the OLPC XO-1 laptop: | |
7bc74b3d | 2760 | - EC-driven system wakeups |
7feda8e9 | 2761 | - Power button |
7bc74b3d | 2762 | - Ebook switch |
2cf2baea | 2763 | - Lid switch |
e1040ac6 DD |
2764 | - AC adapter status updates |
2765 | - Battery status updates | |
7feda8e9 | 2766 | |
a0f30f59 DD |
2767 | config OLPC_XO15_SCI |
2768 | bool "OLPC XO-1.5 SCI extras" | |
d8d01a63 DD |
2769 | depends on OLPC && ACPI |
2770 | select POWER_SUPPLY | |
a0f30f59 DD |
2771 | ---help--- |
2772 | Add support for SCI-based features of the OLPC XO-1.5 laptop: | |
2773 | - EC-driven system wakeups | |
2774 | - AC adapter status updates | |
2775 | - Battery status updates | |
bf1ebf00 | 2776 | |
d4f3e350 EW |
2777 | config ALIX |
2778 | bool "PCEngines ALIX System Support (LED setup)" | |
2779 | select GPIOLIB | |
2780 | ---help--- | |
2781 | This option enables system support for the PCEngines ALIX. | |
2782 | At present this just sets up LEDs for GPIO control on | |
2783 | ALIX2/3/6 boards. However, other system specific setup should | |
2784 | get added here. | |
2785 | ||
2786 | Note: You must still enable the drivers for GPIO and LED support | |
2787 | (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs | |
2788 | ||
2789 | Note: You have to set alix.force=1 for boards with Award BIOS. | |
2790 | ||
da4e3302 PP |
2791 | config NET5501 |
2792 | bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)" | |
2793 | select GPIOLIB | |
2794 | ---help--- | |
2795 | This option enables system support for the Soekris Engineering net5501. | |
2796 | ||
3197059a PP |
2797 | config GEOS |
2798 | bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)" | |
2799 | select GPIOLIB | |
2800 | depends on DMI | |
2801 | ---help--- | |
2802 | This option enables system support for the Traverse Technologies GEOS. | |
2803 | ||
7d029125 VD |
2804 | config TS5500 |
2805 | bool "Technologic Systems TS-5500 platform support" | |
2806 | depends on MELAN | |
2807 | select CHECK_SIGNATURE | |
2808 | select NEW_LEDS | |
2809 | select LEDS_CLASS | |
2810 | ---help--- | |
2811 | This option enables system support for the Technologic Systems TS-5500. | |
2812 | ||
bc0120fd SR |
2813 | endif # X86_32 |
2814 | ||
23ac4ae8 | 2815 | config AMD_NB |
e279b6c1 | 2816 | def_bool y |
0e152cd7 | 2817 | depends on CPU_SUP_AMD && PCI |
e279b6c1 | 2818 | |
e3263ab3 DR |
2819 | config X86_SYSFB |
2820 | bool "Mark VGA/VBE/EFI FB as generic system framebuffer" | |
2821 | help | |
2822 | Firmwares often provide initial graphics framebuffers so the BIOS, | |
2823 | bootloader or kernel can show basic video-output during boot for | |
2824 | user-guidance and debugging. Historically, x86 used the VESA BIOS | |
2825 | Extensions and EFI-framebuffers for this, which are mostly limited | |
2826 | to x86. | |
2827 | This option, if enabled, marks VGA/VBE/EFI framebuffers as generic | |
2828 | framebuffers so the new generic system-framebuffer drivers can be | |
2829 | used on x86. If the framebuffer is not compatible with the generic | |
e3a5dc08 | 2830 | modes, it is advertised as fallback platform framebuffer so legacy |
e3263ab3 DR |
2831 | drivers like efifb, vesafb and uvesafb can pick it up. |
2832 | If this option is not selected, all system framebuffers are always | |
2833 | marked as fallback platform framebuffers as usual. | |
2834 | ||
2835 | Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will | |
2836 | not be able to pick up generic system framebuffers if this option | |
2837 | is selected. You are highly encouraged to enable simplefb as | |
2838 | replacement if you select this option. simplefb can correctly deal | |
2839 | with generic system framebuffers. But you should still keep vesafb | |
2840 | and others enabled as fallback if a system framebuffer is | |
2841 | incompatible with simplefb. | |
2842 | ||
2843 | If unsure, say Y. | |
2844 | ||
e279b6c1 SR |
2845 | endmenu |
2846 | ||
2847 | ||
1572497c | 2848 | menu "Binary Emulations" |
e279b6c1 SR |
2849 | |
2850 | config IA32_EMULATION | |
2851 | bool "IA32 Emulation" | |
2852 | depends on X86_64 | |
39f88911 | 2853 | select ARCH_WANT_OLD_COMPAT_IPC |
d1603990 | 2854 | select BINFMT_ELF |
a97f52e6 | 2855 | select COMPAT_BINFMT_ELF |
39f88911 | 2856 | select COMPAT_OLD_SIGACTION |
8f9ca475 | 2857 | ---help--- |
5fd92e65 L |
2858 | Include code to run legacy 32-bit programs under a |
2859 | 64-bit kernel. You should likely turn this on, unless you're | |
2860 | 100% sure that you don't have any 32-bit programs left. | |
e279b6c1 SR |
2861 | |
2862 | config IA32_AOUT | |
8f9ca475 IM |
2863 | tristate "IA32 a.out support" |
2864 | depends on IA32_EMULATION | |
eac61655 | 2865 | depends on BROKEN |
8f9ca475 IM |
2866 | ---help--- |
2867 | Support old a.out binaries in the 32bit emulation. | |
e279b6c1 | 2868 | |
0bf62763 | 2869 | config X86_X32 |
6ea30386 | 2870 | bool "x32 ABI for 64-bit mode" |
9b54050b | 2871 | depends on X86_64 |
5fd92e65 L |
2872 | ---help--- |
2873 | Include code to run binaries for the x32 native 32-bit ABI | |
2874 | for 64-bit processors. An x32 process gets access to the | |
2875 | full 64-bit register file and wide data path while leaving | |
2876 | pointers at 32 bits for smaller memory footprint. | |
2877 | ||
2878 | You will need a recent binutils (2.22 or later) with | |
2879 | elf32_x86_64 support enabled to compile a kernel with this | |
2880 | option set. | |
2881 | ||
953fee1d IM |
2882 | config COMPAT_32 |
2883 | def_bool y | |
2884 | depends on IA32_EMULATION || X86_32 | |
2885 | select HAVE_UID16 | |
2886 | select OLD_SIGSUSPEND3 | |
2887 | ||
e279b6c1 | 2888 | config COMPAT |
3c2362e6 | 2889 | def_bool y |
0bf62763 | 2890 | depends on IA32_EMULATION || X86_X32 |
e279b6c1 | 2891 | |
3120e25e | 2892 | if COMPAT |
e279b6c1 | 2893 | config COMPAT_FOR_U64_ALIGNMENT |
3120e25e | 2894 | def_bool y |
e279b6c1 SR |
2895 | |
2896 | config SYSVIPC_COMPAT | |
3c2362e6 | 2897 | def_bool y |
3120e25e | 2898 | depends on SYSVIPC |
3120e25e | 2899 | endif |
ee009e4a | 2900 | |
e279b6c1 SR |
2901 | endmenu |
2902 | ||
2903 | ||
e5beae16 KP |
2904 | config HAVE_ATOMIC_IOMAP |
2905 | def_bool y | |
2906 | depends on X86_32 | |
2907 | ||
4692d77f AR |
2908 | config X86_DEV_DMA_OPS |
2909 | bool | |
f7219a53 | 2910 | |
e279b6c1 SR |
2911 | source "drivers/firmware/Kconfig" |
2912 | ||
edf88417 | 2913 | source "arch/x86/kvm/Kconfig" |