1 # SPDX-License-Identifier: GPL-2.0
6 select ACPI_GENERIC_GSI if ACPI
7 select ACPI_MCFG if ACPI
8 select ACPI_HOTPLUG_CPU if ACPI_PROCESSOR && HOTPLUG_CPU
9 select ACPI_PPTT if ACPI
10 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
11 select ARCH_BINFMT_ELF_STATE
12 select ARCH_DISABLE_KASAN_INLINE
13 select ARCH_ENABLE_MEMORY_HOTPLUG
14 select ARCH_ENABLE_MEMORY_HOTREMOVE
15 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
16 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
17 select ARCH_HAS_CPU_FINALIZE_INIT
18 select ARCH_HAS_FORTIFY_SOURCE
20 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
21 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
22 select ARCH_HAS_PTE_SPECIAL
23 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
24 select ARCH_INLINE_READ_LOCK if !PREEMPTION
25 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
26 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
27 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
28 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
29 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
30 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
31 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
32 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
33 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
34 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
35 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
36 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
37 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
38 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
39 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
40 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
41 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
42 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
43 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
44 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
45 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
46 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
47 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
48 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
49 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
50 select ARCH_KEEP_MEMBLOCK
51 select ARCH_MIGHT_HAVE_PC_PARPORT
52 select ARCH_MIGHT_HAVE_PC_SERIO
53 select ARCH_SPARSEMEM_ENABLE
55 select ARCH_SUPPORTS_ACPI
56 select ARCH_SUPPORTS_ATOMIC_RMW
57 select ARCH_SUPPORTS_HUGETLBFS
58 select ARCH_SUPPORTS_LTO_CLANG
59 select ARCH_SUPPORTS_LTO_CLANG_THIN
60 select ARCH_SUPPORTS_NUMA_BALANCING
61 select ARCH_USE_BUILTIN_BSWAP
62 select ARCH_USE_CMPXCHG_LOCKREF
63 select ARCH_USE_QUEUED_RWLOCKS
64 select ARCH_USE_QUEUED_SPINLOCKS
65 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
66 select ARCH_WANT_LD_ORPHAN_WARN
67 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
68 select ARCH_WANTS_NO_INSTR
69 select BUILDTIME_TABLE_SORT
73 select GENERIC_CLOCKEVENTS
74 select GENERIC_CMOS_UPDATE
75 select GENERIC_CPU_AUTOPROBE
76 select GENERIC_CPU_DEVICES
78 select GENERIC_GETTIMEOFDAY
79 select GENERIC_IOREMAP if !ARCH_IOREMAP
80 select GENERIC_IRQ_MULTI_HANDLER
81 select GENERIC_IRQ_PROBE
82 select GENERIC_IRQ_SHOW
83 select GENERIC_LIB_ASHLDI3
84 select GENERIC_LIB_ASHRDI3
85 select GENERIC_LIB_CMPDI2
86 select GENERIC_LIB_LSHRDI3
87 select GENERIC_LIB_UCMPDI2
88 select GENERIC_LIB_DEVMEM_IS_ALLOWED
89 select GENERIC_PCI_IOMAP
90 select GENERIC_SCHED_CLOCK
91 select GENERIC_SMP_IDLE_THREAD
92 select GENERIC_TIME_VSYSCALL
93 select GENERIC_VDSO_TIME_NS
96 select HAVE_ARCH_AUDITSYSCALL
97 select HAVE_ARCH_JUMP_LABEL
98 select HAVE_ARCH_JUMP_LABEL_RELATIVE
99 select HAVE_ARCH_KASAN
100 select HAVE_ARCH_KFENCE
101 select HAVE_ARCH_KGDB if PERF_EVENTS
102 select HAVE_ARCH_MMAP_RND_BITS if MMU
103 select HAVE_ARCH_SECCOMP
104 select HAVE_ARCH_SECCOMP_FILTER
105 select HAVE_ARCH_TRACEHOOK
106 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
107 select HAVE_ASM_MODVERSIONS
108 select HAVE_CONTEXT_TRACKING_USER
109 select HAVE_C_RECORDMCOUNT
110 select HAVE_DEBUG_KMEMLEAK
111 select HAVE_DEBUG_STACKOVERFLOW
112 select HAVE_DMA_CONTIGUOUS
113 select HAVE_DYNAMIC_FTRACE
114 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
115 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
116 select HAVE_DYNAMIC_FTRACE_WITH_REGS
118 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
119 select HAVE_EXIT_THREAD
121 select HAVE_FTRACE_MCOUNT_RECORD
122 select HAVE_FUNCTION_ARG_ACCESS_API
123 select HAVE_FUNCTION_ERROR_INJECTION
124 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
125 select HAVE_FUNCTION_GRAPH_TRACER
126 select HAVE_FUNCTION_TRACER
127 select HAVE_GCC_PLUGINS
128 select HAVE_GENERIC_VDSO
129 select HAVE_HW_BREAKPOINT if PERF_EVENTS
130 select HAVE_IOREMAP_PROT
131 select HAVE_IRQ_EXIT_ON_IRQ_STACK
132 select HAVE_IRQ_TIME_ACCOUNTING
134 select HAVE_KPROBES_ON_FTRACE
135 select HAVE_KRETPROBES
136 select HAVE_MOD_ARCH_SPECIFIC
139 select HAVE_PERF_EVENTS
140 select HAVE_PERF_REGS
141 select HAVE_PERF_USER_STACK_DUMP
142 select HAVE_PREEMPT_DYNAMIC_KEY
143 select HAVE_REGS_AND_STACK_ACCESS_API
147 select HAVE_SAMPLE_FTRACE_DIRECT
148 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
149 select HAVE_SETUP_PER_CPU_AREA if NUMA
150 select HAVE_STACKPROTECTOR
151 select HAVE_SYSCALL_TRACEPOINTS
153 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
154 select IRQ_FORCED_THREADING
155 select IRQ_LOONGARCH_CPU
156 select LOCK_MM_AND_FIND_VMA
157 select MMU_GATHER_MERGE_VMAS if MMU
158 select MODULES_USE_ELF_RELA if MODULES
159 select NEED_PER_CPU_EMBED_FIRST_CHUNK
160 select NEED_PER_CPU_PAGE_FIRST_CHUNK
162 select OF_EARLY_FLATTREE
164 select PCI_DOMAINS_GENERIC
165 select PCI_ECAM if ACPI
167 select PCI_MSI_ARCH_FALLBACKS
169 select PERF_USE_VMALLOC
173 select SYSCTL_ARCH_UNALIGN_ALLOW
174 select SYSCTL_ARCH_UNALIGN_NO_WARN
175 select SYSCTL_EXCEPTION_TRACE
177 select TRACE_IRQFLAGS_SUPPORT
178 select USE_PERCPU_NUMA_NODE_ID
179 select USER_STACKTRACE_SUPPORT
192 config GENERIC_BUG_RELATIVE_POINTERS
194 depends on GENERIC_BUG
196 config GENERIC_CALIBRATE_DELAY
202 config GENERIC_HWEIGHT
205 config L1_CACHE_SHIFT
209 config LOCKDEP_SUPPORT
213 config STACKTRACE_SUPPORT
217 # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the
218 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
219 # are shared between architectures, and specifically expecting the symbols.
220 config MACH_LOONGSON32
223 config MACH_LOONGSON64
226 config FIX_EARLYCON_MEM
229 config PGTABLE_2LEVEL
232 config PGTABLE_3LEVEL
235 config PGTABLE_4LEVEL
238 config PGTABLE_LEVELS
240 default 2 if PGTABLE_2LEVEL
241 default 3 if PGTABLE_3LEVEL
242 default 4 if PGTABLE_4LEVEL
244 config SCHED_OMIT_FRAME_POINTER
248 config AS_HAS_EXPLICIT_RELOCS
249 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
251 config AS_HAS_FCSR_CLASS
252 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
254 config AS_HAS_LSX_EXTENSION
255 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
257 config AS_HAS_LASX_EXTENSION
258 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0)
260 config AS_HAS_LBT_EXTENSION
261 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0)
263 config AS_HAS_LVZ_EXTENSION
264 def_bool $(as-instr,hvcl 0)
266 menu "Kernel type and options"
268 source "kernel/Kconfig.hz"
271 prompt "Page Table Layout"
272 default 16KB_2LEVEL if 32BIT
273 default 16KB_3LEVEL if 64BIT
275 Allows choosing the page table layout, which is a combination
276 of page size and page table levels. The size of virtual memory
277 address space are determined by the page table layout.
280 bool "4KB with 3 levels"
281 select HAVE_PAGE_SIZE_4KB
282 select PGTABLE_3LEVEL
284 This option selects 4KB page size with 3 level page tables, which
285 support a maximum of 39 bits of application virtual memory.
288 bool "4KB with 4 levels"
289 select HAVE_PAGE_SIZE_4KB
290 select PGTABLE_4LEVEL
292 This option selects 4KB page size with 4 level page tables, which
293 support a maximum of 48 bits of application virtual memory.
296 bool "16KB with 2 levels"
297 select HAVE_PAGE_SIZE_16KB
298 select PGTABLE_2LEVEL
300 This option selects 16KB page size with 2 level page tables, which
301 support a maximum of 36 bits of application virtual memory.
304 bool "16KB with 3 levels"
305 select HAVE_PAGE_SIZE_16KB
306 select PGTABLE_3LEVEL
308 This option selects 16KB page size with 3 level page tables, which
309 support a maximum of 47 bits of application virtual memory.
312 bool "64KB with 2 levels"
313 select HAVE_PAGE_SIZE_64KB
314 select PGTABLE_2LEVEL
316 This option selects 64KB page size with 2 level page tables, which
317 support a maximum of 42 bits of application virtual memory.
320 bool "64KB with 3 levels"
321 select HAVE_PAGE_SIZE_64KB
322 select PGTABLE_3LEVEL
324 This option selects 64KB page size with 3 level page tables, which
325 support a maximum of 55 bits of application virtual memory.
330 string "Built-in kernel command line"
332 For most platforms, the arguments for the kernel's command line
333 are provided at run-time, during boot. However, there are cases
334 where either no arguments are being provided or the provided
335 arguments are insufficient or even invalid.
337 When that occurs, it is possible to define a built-in command
338 line here and choose how the kernel should use it later on.
341 prompt "Kernel command line type"
342 default CMDLINE_BOOTLOADER
344 Choose how the kernel will handle the provided built-in command
347 config CMDLINE_BOOTLOADER
348 bool "Use bootloader kernel arguments if available"
350 Prefer the command-line passed by the boot loader if available.
351 Use the built-in command line as fallback in case we get nothing
352 during boot. This is the default behaviour.
354 config CMDLINE_EXTEND
355 bool "Use built-in to extend bootloader kernel arguments"
357 The command-line arguments provided during boot will be
358 appended to the built-in command line. This is useful in
359 cases where the provided arguments are insufficient and
360 you don't want to or cannot modify them.
363 bool "Always use the built-in kernel command string"
365 Always use the built-in command line, even if we get one during
366 boot. This is useful in case you need to override the provided
367 command line on systems where you don't have or want control
373 bool "Enable built-in dtb in kernel"
376 Some existing systems do not provide a canonical device tree to
377 the kernel at boot time. Let's provide a device tree table in the
378 kernel, keyed by the dts filename, containing the relevant DTBs.
380 Built-in DTBs are generic enough and can be used as references.
382 config BUILTIN_DTB_NAME
383 string "Source file for built-in dtb"
384 depends on BUILTIN_DTB
386 Base name (without suffix, relative to arch/loongarch/boot/dts/)
387 for the DTS file that will be used to produce the DTB linked into
391 bool "Enable DMI scanning"
392 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
395 This enables SMBIOS/DMI feature for systems, and scanning of
396 DMI to identify machine quirks.
399 bool "EFI runtime service support"
401 select EFI_RUNTIME_WRAPPERS
403 This enables the kernel to use EFI runtime services that are
404 available (such as the EFI variable services).
407 bool "EFI boot stub support"
410 select EFI_GENERIC_STUB
412 This kernel feature allows the kernel to be loaded directly by
413 EFI firmware without the use of a bootloader.
416 bool "SMT scheduler support"
419 Improves scheduler's performance when there are multiple
420 threads in one physical core.
423 bool "Multi-Processing support"
425 This enables support for systems with more than one CPU. If you have
426 a system with only one CPU, say N. If you have a system with more
429 If you say N here, the kernel will run on uni- and multiprocessor
430 machines, but will use only one CPU of a multiprocessor machine. If
431 you say Y here, the kernel will run on many, but not all,
432 uniprocessor machines. On a uniprocessor machine, the kernel
433 will run faster if you say N here.
435 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
437 If you don't know what to do here, say N.
440 bool "Support for hot-pluggable CPUs"
442 select GENERIC_IRQ_MIGRATION
444 Say Y here to allow turning CPUs off and on. CPUs can be
445 controlled through /sys/devices/system/cpu.
446 (Note: power management support will enable this option
447 automatically on SMP systems. )
448 Say N if you want to disable CPU hotplug.
451 int "Maximum number of CPUs (2-256)"
456 This allows you to specify the maximum number of CPUs which this
462 select ACPI_NUMA if ACPI
464 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
465 support. This option improves performance on systems with more
466 than one NUMA node; on single node systems it is generally better
467 to leave it disabled.
474 config ARCH_FORCE_MAX_ORDER
475 int "Maximum zone order"
476 default "13" if PAGE_SIZE_64KB
477 default "11" if PAGE_SIZE_16KB
480 The kernel memory allocator divides physically contiguous memory
481 blocks into "zones", where each zone is a power of two number of
482 pages. This option selects the largest power of two that the kernel
483 keeps in the memory allocator. If you need to allocate very large
484 blocks of physically contiguous memory, then you may need to
487 The page size is not necessarily 4KB. Keep this in mind
488 when choosing a value for this option.
491 bool "Enable LoongArch DMW-based ioremap()"
493 We use generic TLB-based ioremap() by default since it has page
494 protection support. However, you can enable LoongArch DMW-based
495 ioremap() for better performance.
497 config ARCH_WRITECOMBINE
498 bool "Enable WriteCombine (WUC) for ioremap()"
500 LoongArch maintains cache coherency in hardware, but when paired
501 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which
502 is similar to WriteCombine) is out of the scope of cache coherency
503 machanism for PCIe devices (this is a PCIe protocol violation, which
504 may be fixed in newer chipsets).
506 This means WUC can only used for write-only memory regions now, so
507 this option is disabled by default, making WUC silently fallback to
508 SUC for ioremap(). You can enable this option if the kernel is ensured
509 to run on hardware without this bug.
511 You can override this setting via writecombine=on/off boot parameter.
513 config ARCH_STRICT_ALIGN
514 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT
517 Not all LoongArch cores support h/w unaligned access, we can use
518 -mstrict-align build parameter to prevent unaligned accesses.
520 CPUs with h/w unaligned access support:
521 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
523 CPUs without h/w unaligned access support:
524 Loongson-2K500/2K1000.
526 This option is enabled by default to make the kernel be able to run
527 on all LoongArch systems. But you can disable it manually if you want
528 to run kernel only on systems with h/w unaligned access support in
529 order to optimise for performance.
536 bool "Support for the Loongson SIMD Extension"
537 depends on AS_HAS_LSX_EXTENSION
539 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers
540 and a set of SIMD instructions to operate on them. When this option
541 is enabled the kernel will support allocating & switching LSX
542 vector register contexts. If you know that your kernel will only be
543 running on CPUs which do not support LSX or that your userland will
544 not be making use of it then you may wish to say N here to reduce
545 the size & complexity of your kernel.
550 bool "Support for the Loongson Advanced SIMD Extension"
551 depends on CPU_HAS_LSX
552 depends on AS_HAS_LASX_EXTENSION
554 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector
555 registers and a set of SIMD instructions to operate on them. When this
556 option is enabled the kernel will support allocating & switching LASX
557 vector register contexts. If you know that your kernel will only be
558 running on CPUs which do not support LASX or that your userland will
559 not be making use of it then you may wish to say N here to reduce
560 the size & complexity of your kernel.
565 bool "Support for the Loongson Binary Translation Extension"
566 depends on AS_HAS_LBT_EXTENSION
568 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0
569 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop).
570 Enabling this option allows the kernel to allocate and switch registers
573 If you want to use this feature, such as the Loongson Architecture
574 Translator (LAT), say Y.
576 config CPU_HAS_PREFETCH
580 config ARCH_SUPPORTS_KEXEC
583 config ARCH_SUPPORTS_CRASH_DUMP
586 config ARCH_SELECTS_CRASH_DUMP
588 depends on CRASH_DUMP
591 config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
595 bool "Relocatable kernel"
597 This builds the kernel as a Position Independent Executable (PIE),
598 which retains all relocation metadata required, so as to relocate
599 the kernel binary at runtime to a different virtual address from
602 config RANDOMIZE_BASE
603 bool "Randomize the address of the kernel (KASLR)"
604 depends on RELOCATABLE
606 Randomizes the physical and virtual address at which the
607 kernel image is loaded, as a security feature that
608 deters exploit attempts relying on knowledge of the location
611 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET.
615 config RANDOMIZE_BASE_MAX_OFFSET
616 hex "Maximum KASLR offset" if EXPERT
617 depends on RANDOMIZE_BASE
621 When KASLR is active, this provides the maximum offset that will
622 be applied to the kernel image. It should be set according to the
623 amount of physical RAM available in the target system.
625 This is limited by the size of the lower address memory, 256MB.
629 config ARCH_SELECT_MEMORY_MODEL
632 config ARCH_FLATMEM_ENABLE
636 config ARCH_SPARSEMEM_ENABLE
638 select SPARSEMEM_VMEMMAP_ENABLE
640 Say Y to support efficient handling of sparse physical memory,
641 for architectures which are either NUMA (Non-Uniform Memory Access)
642 or have huge holes in the physical address space for other reasons.
643 See <file:Documentation/mm/numa.rst> for more.
645 config ARCH_MEMORY_PROBE
647 depends on MEMORY_HOTPLUG
653 config ARCH_MMAP_RND_BITS_MIN
656 config ARCH_MMAP_RND_BITS_MAX
659 config ARCH_SUPPORTS_UPROBES
662 config KASAN_SHADOW_OFFSET
667 menu "Power management options"
669 config ARCH_SUSPEND_POSSIBLE
672 config ARCH_HIBERNATION_POSSIBLE
675 source "kernel/power/Kconfig"
676 source "drivers/acpi/Kconfig"
680 source "arch/loongarch/kvm/Kconfig"