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ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
fbe934d6 PD |
2 | # |
3 | # For a description of the syntax of this configuration file, | |
cd238eff | 4 | # see Documentation/kbuild/kconfig-language.rst. |
fbe934d6 PD |
5 | # |
6 | ||
c3e4ed01 CH |
7 | config 64BIT |
8 | bool | |
9 | ||
10 | config 32BIT | |
11 | bool | |
12 | ||
fbe934d6 PD |
13 | config RISCV |
14 | def_bool y | |
15 | select OF | |
16 | select OF_EARLY_FLATTREE | |
17 | select OF_IRQ | |
ad97f9df | 18 | select ARCH_HAS_BINFMT_FLAT |
fbe934d6 PD |
19 | select ARCH_WANT_FRAME_POINTERS |
20 | select CLONE_BACKWARDS | |
21 | select COMMON_CLK | |
22 | select GENERIC_CLOCKEVENTS | |
fbe934d6 PD |
23 | select GENERIC_IRQ_SHOW |
24 | select GENERIC_PCI_IOMAP | |
9b9afe4a | 25 | select GENERIC_SCHED_CLOCK |
6bd33e1e CH |
26 | select GENERIC_STRNCPY_FROM_USER if MMU |
27 | select GENERIC_STRNLEN_USER if MMU | |
fbe934d6 | 28 | select GENERIC_SMP_IDLE_THREAD |
09afac77 | 29 | select GENERIC_ATOMIC64 if !64BIT |
38af5782 | 30 | select GENERIC_IOREMAP |
59c4da86 | 31 | select GENERIC_PTDUMP if MMU |
efe75c49 | 32 | select HAVE_ARCH_AUDITSYSCALL |
5340627e | 33 | select HAVE_ARCH_SECCOMP_FILTER |
2ff2b7ec | 34 | select HAVE_ASM_MODVERSIONS |
5ec9c4ff | 35 | select HAVE_MEMBLOCK_NODE_MAP |
6bd33e1e | 36 | select HAVE_DMA_CONTIGUOUS if MMU |
b90edb33 | 37 | select HAVE_FUTEX_CMPXCHG if FUTEX |
178e9fc4 | 38 | select HAVE_PERF_EVENTS |
98a93b0b MH |
39 | select HAVE_PERF_REGS |
40 | select HAVE_PERF_USER_STACK_DUMP | |
5aeb1b36 | 41 | select HAVE_SYSCALL_TRACEPOINTS |
fbe934d6 | 42 | select IRQ_DOMAIN |
fbe934d6 PD |
43 | select SPARSE_IRQ |
44 | select SYSCTL_EXCEPTION_TRACE | |
45 | select HAVE_ARCH_TRACEHOOK | |
eb01d42a | 46 | select HAVE_PCI |
fbe934d6 | 47 | select MODULES_USE_ELF_RELA if MODULES |
2cffc956 | 48 | select MODULE_SECTIONS if MODULES |
fbe934d6 | 49 | select THREAD_INFO_IN_TASK |
2eac9c2d | 50 | select PCI_DOMAINS_GENERIC if PCI |
eb01d42a | 51 | select PCI_MSI if PCI |
fbe934d6 | 52 | select RISCV_TIMER |
cc6c9848 | 53 | select GENERIC_IRQ_MULTI_HANDLER |
03f11f03 | 54 | select GENERIC_ARCH_TOPOLOGY if SMP |
3010a5ea | 55 | select ARCH_HAS_PTE_SPECIAL |
b012980d | 56 | select ARCH_HAS_MMIOWB |
21e24140 | 57 | select ARCH_HAS_DEBUG_VIRTUAL if MMU |
93bbb255 | 58 | select HAVE_EBPF_JIT if MMU |
91abaeaa | 59 | select EDAC_SUPPORT |
9e953cda | 60 | select ARCH_HAS_GIGANTIC_PAGE |
395a21ff | 61 | select ARCH_HAS_SET_DIRECT_MAP |
d3ab332a | 62 | select ARCH_HAS_SET_MEMORY |
a5fe13c7 | 63 | select ARCH_HAS_STRICT_KERNEL_RWX if MMU |
9e953cda | 64 | select ARCH_WANT_HUGE_PMD_SHARE if 64BIT |
d95f1a54 | 65 | select SPARSEMEM_STATIC if 32BIT |
54c95a11 | 66 | select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU |
6bd33e1e | 67 | select HAVE_ARCH_MMAP_RND_BITS if MMU |
0da310e8 | 68 | select ARCH_HAS_GCOV_PROFILE_ALL |
20bda4ed | 69 | select HAVE_COPY_THREAD_TLS |
8ad8b727 | 70 | select HAVE_ARCH_KASAN if MMU && 64BIT |
54c95a11 AG |
71 | |
72 | config ARCH_MMAP_RND_BITS_MIN | |
73 | default 18 if 64BIT | |
74 | default 8 | |
75 | ||
76 | # max bits determined by the following formula: | |
77 | # VA_BITS - PAGE_SHIFT - 3 | |
78 | config ARCH_MMAP_RND_BITS_MAX | |
79 | default 24 if 64BIT # SV39 based | |
80 | default 17 | |
fbe934d6 | 81 | |
a4c3733d CH |
82 | # set if we run in machine mode, cleared if we run in supervisor mode |
83 | config RISCV_M_MODE | |
84 | bool | |
6bd33e1e | 85 | default !MMU |
a4c3733d | 86 | |
eded8bc6 DLM |
87 | # set if we are running in S-mode and can use SBI calls |
88 | config RISCV_SBI | |
89 | bool | |
90 | depends on !RISCV_M_MODE | |
91 | default y | |
92 | ||
fbe934d6 | 93 | config MMU |
6bd33e1e CH |
94 | bool "MMU-based Paged Memory Management Support" |
95 | default y | |
96 | help | |
97 | Select if you want MMU-based virtualised addressing space | |
98 | support by paged memory management. If unsure, say 'Y'. | |
fbe934d6 | 99 | |
5ec9c4ff CH |
100 | config ZONE_DMA32 |
101 | bool | |
f1306f04 | 102 | default y if 64BIT |
5ec9c4ff | 103 | |
d95f1a54 LG |
104 | config VA_BITS |
105 | int | |
106 | default 32 if 32BIT | |
107 | default 39 if 64BIT | |
108 | ||
109 | config PA_BITS | |
110 | int | |
111 | default 34 if 32BIT | |
112 | default 56 if 64BIT | |
113 | ||
fbe934d6 PD |
114 | config PAGE_OFFSET |
115 | hex | |
116 | default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB | |
6bd33e1e | 117 | default 0x80000000 if 64BIT && !MMU |
fbe934d6 PD |
118 | default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB |
119 | default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB | |
120 | ||
d95f1a54 LG |
121 | config ARCH_FLATMEM_ENABLE |
122 | def_bool y | |
123 | ||
124 | config ARCH_SPARSEMEM_ENABLE | |
125 | def_bool y | |
aa273420 | 126 | depends on MMU |
d95f1a54 LG |
127 | select SPARSEMEM_VMEMMAP_ENABLE |
128 | ||
129 | config ARCH_SELECT_MEMORY_MODEL | |
130 | def_bool ARCH_SPARSEMEM_ENABLE | |
131 | ||
9e953cda AG |
132 | config ARCH_WANT_GENERAL_HUGETLB |
133 | def_bool y | |
134 | ||
5fde3db5 ZL |
135 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
136 | def_bool y | |
137 | ||
9e953cda | 138 | config SYS_SUPPORTS_HUGETLBFS |
69868418 | 139 | depends on MMU |
9e953cda AG |
140 | def_bool y |
141 | ||
fbe934d6 PD |
142 | config STACKTRACE_SUPPORT |
143 | def_bool y | |
144 | ||
10626c32 AK |
145 | config TRACE_IRQFLAGS_SUPPORT |
146 | def_bool y | |
147 | ||
fbe934d6 PD |
148 | config GENERIC_BUG |
149 | def_bool y | |
150 | depends on BUG | |
151 | select GENERIC_BUG_RELATIVE_POINTERS if 64BIT | |
152 | ||
153 | config GENERIC_BUG_RELATIVE_POINTERS | |
154 | bool | |
155 | ||
156 | config GENERIC_CALIBRATE_DELAY | |
157 | def_bool y | |
158 | ||
159 | config GENERIC_CSUM | |
160 | def_bool y | |
161 | ||
162 | config GENERIC_HWEIGHT | |
163 | def_bool y | |
164 | ||
f2c17aab | 165 | config FIX_EARLYCON_MEM |
0312a3d4 | 166 | def_bool MMU |
f2c17aab | 167 | |
fbe934d6 PD |
168 | config PGTABLE_LEVELS |
169 | int | |
170 | default 3 if 64BIT | |
171 | default 2 | |
172 | ||
0cbb8a32 LO |
173 | source "arch/riscv/Kconfig.socs" |
174 | ||
fbe934d6 PD |
175 | menu "Platform type" |
176 | ||
177 | choice | |
178 | prompt "Base ISA" | |
179 | default ARCH_RV64I | |
180 | help | |
86cca81a | 181 | This selects the base ISA that this kernel will target and must match |
fbe934d6 PD |
182 | the target platform. |
183 | ||
184 | config ARCH_RV32I | |
185 | bool "RV32I" | |
fbe934d6 | 186 | select 32BIT |
e3d59805 MR |
187 | select GENERIC_LIB_ASHLDI3 |
188 | select GENERIC_LIB_ASHRDI3 | |
189 | select GENERIC_LIB_LSHRDI3 | |
8f79125d | 190 | select GENERIC_LIB_UCMPDI2 |
6bd33e1e | 191 | select MMU |
fbe934d6 PD |
192 | |
193 | config ARCH_RV64I | |
194 | bool "RV64I" | |
fbe934d6 | 195 | select 64BIT |
c12d3362 | 196 | select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000 |
10626c32 AK |
197 | select HAVE_FUNCTION_TRACER |
198 | select HAVE_FUNCTION_GRAPH_TRACER | |
a1d2a6b4 | 199 | select HAVE_FTRACE_MCOUNT_RECORD |
6bd33e1e CH |
200 | select HAVE_DYNAMIC_FTRACE if MMU |
201 | select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE | |
202 | select SWIOTLB if MMU | |
fbe934d6 PD |
203 | |
204 | endchoice | |
205 | ||
206 | # We must be able to map all physical memory into the kernel, but the compiler | |
207 | # is still a bit more efficient when generating code if it's setup in a manner | |
208 | # such that it can only map 2GiB of memory. | |
209 | choice | |
210 | prompt "Kernel Code Model" | |
211 | default CMODEL_MEDLOW if 32BIT | |
212 | default CMODEL_MEDANY if 64BIT | |
213 | ||
214 | config CMODEL_MEDLOW | |
215 | bool "medium low code model" | |
216 | config CMODEL_MEDANY | |
217 | bool "medium any code model" | |
218 | endchoice | |
219 | ||
ab1ef68e ZL |
220 | config MODULE_SECTIONS |
221 | bool | |
222 | select HAVE_MOD_ARCH_SPECIFIC | |
223 | ||
fbe934d6 PD |
224 | choice |
225 | prompt "Maximum Physical Memory" | |
226 | default MAXPHYSMEM_2GB if 32BIT | |
227 | default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW | |
228 | default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY | |
229 | ||
230 | config MAXPHYSMEM_2GB | |
231 | bool "2GiB" | |
232 | config MAXPHYSMEM_128GB | |
233 | depends on 64BIT && CMODEL_MEDANY | |
234 | bool "128GiB" | |
235 | endchoice | |
236 | ||
237 | ||
238 | config SMP | |
239 | bool "Symmetric Multi-Processing" | |
240 | help | |
241 | This enables support for systems with more than one CPU. If | |
242 | you say N here, the kernel will run on single and | |
243 | multiprocessor machines, but will use only one CPU of a | |
244 | multiprocessor machine. If you say Y here, the kernel will run | |
245 | on many, but not all, single processor machines. On a single | |
246 | processor machine, the kernel will run faster if you say N | |
247 | here. | |
248 | ||
249 | If you don't know what to do here, say N. | |
250 | ||
251 | config NR_CPUS | |
252 | int "Maximum number of CPUs (2-32)" | |
253 | range 2 32 | |
254 | depends on SMP | |
255 | default "8" | |
256 | ||
f1e58583 AP |
257 | config HOTPLUG_CPU |
258 | bool "Support for hot-pluggable CPUs" | |
259 | depends on SMP | |
260 | select GENERIC_IRQ_MIGRATION | |
261 | help | |
262 | ||
263 | Say Y here to experiment with turning CPUs off and on. CPUs | |
264 | can be controlled through /sys/devices/system/cpu. | |
265 | ||
266 | Say N if you want to disable CPU hotplug. | |
267 | ||
fbe934d6 PD |
268 | choice |
269 | prompt "CPU Tuning" | |
270 | default TUNE_GENERIC | |
271 | ||
272 | config TUNE_GENERIC | |
273 | bool "generic" | |
274 | ||
275 | endchoice | |
276 | ||
277 | config RISCV_ISA_C | |
278 | bool "Emit compressed instructions when building Linux" | |
279 | default y | |
280 | help | |
281 | Adds "C" to the ISA subsets that the toolchain is allowed to emit | |
282 | when building Linux, which results in compressed instructions in the | |
283 | Linux binary. | |
284 | ||
285 | If you don't know what to do here, say Y. | |
286 | ||
178e9fc4 AK |
287 | menu "supported PMU type" |
288 | depends on PERF_EVENTS | |
289 | ||
290 | config RISCV_BASE_PMU | |
291 | bool "Base Performance Monitoring Unit" | |
292 | def_bool y | |
293 | help | |
294 | A base PMU that serves as a reference implementation and has limited | |
295 | feature of perf. It can run on any RISC-V machines so serves as the | |
296 | fallback, but this option can also be disable to reduce kernel size. | |
297 | ||
298 | endmenu | |
299 | ||
9671f706 AK |
300 | config FPU |
301 | bool "FPU support" | |
302 | default y | |
303 | help | |
304 | Say N here if you want to disable all floating-point related procedure | |
305 | in the kernel. | |
306 | ||
307 | If you don't know what to do here, say Y. | |
308 | ||
fbe934d6 PD |
309 | endmenu |
310 | ||
aef53f97 | 311 | menu "Kernel features" |
fbe934d6 | 312 | |
fbe934d6 PD |
313 | source "kernel/Kconfig.hz" |
314 | ||
5340627e DA |
315 | config SECCOMP |
316 | bool "Enable seccomp to safely compute untrusted bytecode" | |
317 | help | |
318 | This kernel feature is useful for number crunching applications | |
319 | that may need to compute untrusted bytecode during their | |
320 | execution. By using pipes or other transports made available to | |
321 | the process as file descriptors supporting the read/write | |
322 | syscalls, it's possible to isolate those applications in | |
323 | their own address space using seccomp. Once seccomp is | |
324 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled | |
325 | and the task is only allowed to execute a few safe syscalls | |
326 | defined by each seccomp mode. | |
327 | ||
efca1398 AP |
328 | config RISCV_SBI_V01 |
329 | bool "SBI v0.1 support" | |
330 | default y | |
331 | depends on RISCV_SBI | |
332 | help | |
333 | This config allows kernel to use SBI v0.1 APIs. This will be | |
334 | deprecated in future once legacy M-mode software are no longer in use. | |
fbe934d6 PD |
335 | endmenu |
336 | ||
aef53f97 NK |
337 | menu "Boot options" |
338 | ||
3aed8c43 NK |
339 | config CMDLINE |
340 | string "Built-in kernel command line" | |
aef53f97 | 341 | help |
3aed8c43 NK |
342 | For most platforms, the arguments for the kernel's command line |
343 | are provided at run-time, during boot. However, there are cases | |
344 | where either no arguments are being provided or the provided | |
345 | arguments are insufficient or even invalid. | |
aef53f97 | 346 | |
3aed8c43 NK |
347 | When that occurs, it is possible to define a built-in command |
348 | line here and choose how the kernel should use it later on. | |
aef53f97 | 349 | |
3aed8c43 NK |
350 | choice |
351 | prompt "Built-in command line usage" if CMDLINE != "" | |
352 | default CMDLINE_FALLBACK | |
353 | help | |
354 | Choose how the kernel will handle the provided built-in command | |
355 | line. | |
aef53f97 | 356 | |
3aed8c43 NK |
357 | config CMDLINE_FALLBACK |
358 | bool "Use bootloader kernel arguments if available" | |
aef53f97 | 359 | help |
3aed8c43 NK |
360 | Use the built-in command line as fallback in case we get nothing |
361 | during boot. This is the default behaviour. | |
362 | ||
363 | config CMDLINE_EXTEND | |
364 | bool "Extend bootloader kernel arguments" | |
365 | help | |
366 | The command-line arguments provided during boot will be | |
367 | appended to the built-in command line. This is useful in | |
368 | cases where the provided arguments are insufficient and | |
369 | you don't want to or cannot modify them. | |
370 | ||
aef53f97 NK |
371 | |
372 | config CMDLINE_FORCE | |
3aed8c43 | 373 | bool "Always use the default kernel command string" |
aef53f97 | 374 | help |
3aed8c43 NK |
375 | Always use the built-in command line, even if we get one during |
376 | boot. This is useful in case you need to override the provided | |
377 | command line on systems where you don't have or want control | |
378 | over it. | |
aef53f97 | 379 | |
3aed8c43 | 380 | endchoice |
aef53f97 NK |
381 | |
382 | endmenu | |
383 | ||
fbe934d6 PD |
384 | menu "Power management options" |
385 | ||
8636a1f9 | 386 | source "kernel/power/Kconfig" |
fbe934d6 PD |
387 | |
388 | endmenu |