1 # SPDX-License-Identifier: GPL-2.0-only
2 #
3 # For a description of the syntax of this configuration file,
4 # see Documentation/kbuild/kconfig-language.rst.
5 #
6
7 config 64BIT
8 bool
9
10 config 32BIT
11 bool
12
13 config RISCV
14 def_bool y
15 select ACPI_GENERIC_GSI if ACPI
16 select ACPI_MCFG if (ACPI && PCI)
17 select ACPI_PPTT if ACPI
18 select ACPI_REDUCED_HARDWARE_ONLY if ACPI
19 select ACPI_SPCR_TABLE if ACPI
20 select ARCH_DMA_DEFAULT_COHERENT
21 select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
22 select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM_VMEMMAP
23 select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG
24 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
25 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
26 select ARCH_HAS_BINFMT_FLAT
27 select ARCH_HAS_CURRENT_STACK_POINTER
28 select ARCH_HAS_DEBUG_VIRTUAL if MMU
29 select ARCH_HAS_DEBUG_VM_PGTABLE
30 select ARCH_HAS_DEBUG_WX
31 select ARCH_HAS_FAST_MULTIPLIER
32 select ARCH_HAS_FORTIFY_SOURCE
33 select ARCH_HAS_GCOV_PROFILE_ALL
34 select ARCH_HAS_GIGANTIC_PAGE
35 select ARCH_HAS_KCOV
36 select ARCH_HAS_KERNEL_FPU_SUPPORT if 64BIT && FPU
37 select ARCH_HAS_MEMBARRIER_CALLBACKS
38 select ARCH_HAS_MEMBARRIER_SYNC_CORE
39 select ARCH_HAS_MMIOWB
40 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
41 select ARCH_HAS_PMEM_API
42 select ARCH_HAS_PREPARE_SYNC_CORE_CMD
43 select ARCH_HAS_PTE_DEVMAP if 64BIT && MMU
44 select ARCH_HAS_PTE_SPECIAL
45 select ARCH_HAS_SET_DIRECT_MAP if MMU
46 select ARCH_HAS_SET_MEMORY if MMU
47 select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
48 select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL
49 select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
50 select ARCH_HAS_SYSCALL_WRAPPER
51 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
52 select ARCH_HAS_UBSAN
53 select ARCH_HAS_VDSO_DATA
54 select ARCH_KEEP_MEMBLOCK if ACPI
55 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if 64BIT && MMU
56 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
57 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
58 select ARCH_STACKWALK
59 select ARCH_SUPPORTS_ATOMIC_RMW
60 select ARCH_SUPPORTS_CFI_CLANG
61 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU
62 select ARCH_SUPPORTS_HUGETLBFS if MMU
63 # LLD >= 14: https://github.com/llvm/llvm-project/issues/50505
64 select ARCH_SUPPORTS_LTO_CLANG if LLD_VERSION >= 140000
65 select ARCH_SUPPORTS_LTO_CLANG_THIN if LLD_VERSION >= 140000
66 select ARCH_SUPPORTS_PAGE_TABLE_CHECK if MMU
67 select ARCH_SUPPORTS_PER_VMA_LOCK if MMU
68 select ARCH_SUPPORTS_RT
69 select ARCH_SUPPORTS_SHADOW_CALL_STACK if HAVE_SHADOW_CALL_STACK
70 select ARCH_USE_CMPXCHG_LOCKREF if 64BIT
71 select ARCH_USE_MEMTEST
72 select ARCH_USE_QUEUED_RWLOCKS
73 select ARCH_USE_SYM_ANNOTATIONS
74 select ARCH_USES_CFI_TRAPS if CFI_CLANG
75 select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH if MMU
76 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
77 select ARCH_WANT_FRAME_POINTERS
78 select ARCH_WANT_GENERAL_HUGETLB if !RISCV_ISA_SVNAPOT
79 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
80 select ARCH_WANT_LD_ORPHAN_WARN if !XIP_KERNEL
81 select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP
82 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
83 select ARCH_WANTS_NO_INSTR
84 select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE
85 select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU
86 select BUILDTIME_TABLE_SORT if MMU
87 select CLINT_TIMER if RISCV_M_MODE
88 select CLONE_BACKWARDS
89 select COMMON_CLK
90 select CPU_PM if CPU_IDLE || HIBERNATION || SUSPEND
91 select EDAC_SUPPORT
92 select FRAME_POINTER if PERF_EVENTS || (FUNCTION_TRACER && !DYNAMIC_FTRACE)
93 select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if DYNAMIC_FTRACE
94 select GENERIC_ARCH_TOPOLOGY
95 select GENERIC_ATOMIC64 if !64BIT
96 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
97 select GENERIC_CPU_DEVICES
98 select GENERIC_CPU_VULNERABILITIES
99 select GENERIC_EARLY_IOREMAP
100 select GENERIC_ENTRY
101 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
102 select GENERIC_IDLE_POLL_SETUP
103 select GENERIC_IOREMAP if MMU
104 select GENERIC_IRQ_IPI if SMP
105 select GENERIC_IRQ_IPI_MUX if SMP
106 select GENERIC_IRQ_MULTI_HANDLER
107 select GENERIC_IRQ_SHOW
108 select GENERIC_IRQ_SHOW_LEVEL
109 select GENERIC_LIB_DEVMEM_IS_ALLOWED
110 select GENERIC_PCI_IOMAP
111 select GENERIC_PTDUMP if MMU
112 select GENERIC_SCHED_CLOCK
113 select GENERIC_SMP_IDLE_THREAD
114 select GENERIC_TIME_VSYSCALL if MMU && 64BIT
115 select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO
116 select HARDIRQS_SW_RESEND
117 select HAS_IOPORT if MMU
118 select HAVE_ARCH_AUDITSYSCALL
119 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
120 select HAVE_ARCH_HUGE_VMAP if MMU && 64BIT
121 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
122 select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL
123 select HAVE_ARCH_KASAN if MMU && 64BIT
124 select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT
125 select HAVE_ARCH_KFENCE if MMU && 64BIT
126 select HAVE_ARCH_KGDB if !XIP_KERNEL
127 select HAVE_ARCH_KGDB_QXFER_PKT
128 select HAVE_ARCH_MMAP_RND_BITS if MMU
129 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
130 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
131 select HAVE_ARCH_SECCOMP_FILTER
132 select HAVE_ARCH_STACKLEAK
133 select HAVE_ARCH_THREAD_STRUCT_WHITELIST
134 select HAVE_ARCH_TRACEHOOK
135 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU
136 select HAVE_ARCH_USERFAULTFD_MINOR if 64BIT && USERFAULTFD
137 select HAVE_ARCH_VMAP_STACK if MMU && 64BIT
138 select HAVE_ASM_MODVERSIONS
139 select HAVE_CONTEXT_TRACKING_USER
140 select HAVE_DEBUG_KMEMLEAK
141 select HAVE_DMA_CONTIGUOUS if MMU
142 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && (CLANG_SUPPORTS_DYNAMIC_FTRACE || GCC_SUPPORTS_DYNAMIC_FTRACE)
143 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
144 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if HAVE_DYNAMIC_FTRACE
145 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
146 select HAVE_FUNCTION_GRAPH_TRACER
147 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
148 select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !PREEMPTION
149 select HAVE_EBPF_JIT if MMU
150 select HAVE_GUP_FAST if MMU
151 select HAVE_FUNCTION_ARG_ACCESS_API
152 select HAVE_FUNCTION_ERROR_INJECTION
153 select HAVE_GCC_PLUGINS
154 select HAVE_GENERIC_VDSO if MMU && 64BIT
155 select HAVE_IRQ_TIME_ACCOUNTING
156 select HAVE_KERNEL_BZIP2 if !XIP_KERNEL && !EFI_ZBOOT
157 select HAVE_KERNEL_GZIP if !XIP_KERNEL && !EFI_ZBOOT
158 select HAVE_KERNEL_LZ4 if !XIP_KERNEL && !EFI_ZBOOT
159 select HAVE_KERNEL_LZMA if !XIP_KERNEL && !EFI_ZBOOT
160 select HAVE_KERNEL_LZO if !XIP_KERNEL && !EFI_ZBOOT
161 select HAVE_KERNEL_UNCOMPRESSED if !XIP_KERNEL && !EFI_ZBOOT
162 select HAVE_KERNEL_ZSTD if !XIP_KERNEL && !EFI_ZBOOT
163 select HAVE_KERNEL_XZ if !XIP_KERNEL && !EFI_ZBOOT
164 select HAVE_KPROBES if !XIP_KERNEL
165 select HAVE_KRETPROBES if !XIP_KERNEL
166 # https://github.com/ClangBuiltLinux/linux/issues/1881
167 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if !LD_IS_LLD
168 select HAVE_MOVE_PMD
169 select HAVE_MOVE_PUD
170 select HAVE_PAGE_SIZE_4KB
171 select HAVE_PCI
172 select HAVE_PERF_EVENTS
173 select HAVE_PERF_REGS
174 select HAVE_PERF_USER_STACK_DUMP
175 select HAVE_POSIX_CPU_TIMERS_TASK_WORK
176 select HAVE_PREEMPT_DYNAMIC_KEY if !XIP_KERNEL
177 select HAVE_REGS_AND_STACK_ACCESS_API
178 select HAVE_RETHOOK if !XIP_KERNEL
179 select HAVE_RSEQ
180 select HAVE_RUST if RUSTC_SUPPORTS_RISCV && CC_IS_CLANG
181 select HAVE_SAMPLE_FTRACE_DIRECT
182 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
183 select HAVE_STACKPROTECTOR
184 select HAVE_SYSCALL_TRACEPOINTS
185 select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU
186 select IRQ_DOMAIN
187 select IRQ_FORCED_THREADING
188 select KASAN_VMALLOC if KASAN
189 select LOCK_MM_AND_FIND_VMA
190 select MMU_GATHER_RCU_TABLE_FREE if SMP && MMU
191 select MODULES_USE_ELF_RELA if MODULES
192 select OF
193 select OF_EARLY_FLATTREE
194 select OF_IRQ
195 select PCI_DOMAINS_GENERIC if PCI
196 select PCI_ECAM if (ACPI && PCI)
197 select PCI_MSI if PCI
198 select RISCV_ALTERNATIVE if !XIP_KERNEL
199 select RISCV_APLIC
200 select RISCV_IMSIC
201 select RISCV_INTC
202 select RISCV_TIMER if RISCV_SBI
203 select SIFIVE_PLIC
204 select SPARSE_IRQ
205 select SYSCTL_EXCEPTION_TRACE
206 select THREAD_INFO_IN_TASK
207 select TRACE_IRQFLAGS_SUPPORT
208 select UACCESS_MEMCPY if !MMU
209 select USER_STACKTRACE_SUPPORT
210 select ZONE_DMA32 if 64BIT
211
212 config RUSTC_SUPPORTS_RISCV
213 def_bool y
214 depends on 64BIT
215 # Shadow call stack requires rustc version 1.82+ due to use of the
216 # -Zsanitizer=shadow-call-stack flag.
217 depends on !SHADOW_CALL_STACK || RUSTC_VERSION >= 108200
218
219 config CLANG_SUPPORTS_DYNAMIC_FTRACE
220 def_bool CC_IS_CLANG
221 # https://github.com/ClangBuiltLinux/linux/issues/1817
222 depends on AS_IS_GNU || (AS_IS_LLVM && (LD_IS_LLD || LD_VERSION >= 23600))
223
224 config GCC_SUPPORTS_DYNAMIC_FTRACE
225 def_bool CC_IS_GCC
226 depends on $(cc-option,-fpatchable-function-entry=8)
227
228 config HAVE_SHADOW_CALL_STACK
229 def_bool $(cc-option,-fsanitize=shadow-call-stack)
230 # https://github.com/riscv-non-isa/riscv-elf-psabi-doc/commit/a484e843e6eeb51f0cb7b8819e50da6d2444d769
231 depends on $(ld-option,--no-relax-gp)
232
233 config RISCV_USE_LINKER_RELAXATION
234 def_bool y
235 # https://github.com/llvm/llvm-project/commit/6611d58f5bbcbec77262d392e2923e1d680f6985
236 depends on !LD_IS_LLD || LLD_VERSION >= 150000
237
238 # https://github.com/llvm/llvm-project/commit/bbc0f99f3bc96f1db16f649fc21dd18e5b0918f6
239 config ARCH_HAS_BROKEN_DWARF5
240 def_bool y
241 depends on RISCV_USE_LINKER_RELAXATION
242 # https://github.com/llvm/llvm-project/commit/1df5ea29b43690b6622db2cad7b745607ca4de6a
243 depends on AS_IS_LLVM && AS_VERSION < 180000
244 # https://github.com/llvm/llvm-project/commit/7ffabb61a5569444b5ac9322e22e5471cc5e4a77
245 depends on LD_IS_LLD && LLD_VERSION < 180000
246
247 config ARCH_MMAP_RND_BITS_MIN
248 default 18 if 64BIT
249 default 8
250
251 config ARCH_MMAP_RND_COMPAT_BITS_MIN
252 default 8
253
254 # max bits determined by the following formula:
255 # VA_BITS - PAGE_SHIFT - 3
256 config ARCH_MMAP_RND_BITS_MAX
257 default 24 if 64BIT # SV39 based
258 default 17
259
260 config ARCH_MMAP_RND_COMPAT_BITS_MAX
261 default 17
262
263 # set if we run in machine mode, cleared if we run in supervisor mode
264 config RISCV_M_MODE
265 bool "Build a kernel that runs in machine mode"
266 depends on !MMU
267 default y
268 help
269 Select this option if you want to run the kernel in M-mode,
270 without the assistance of any other firmware.
271
272 # set if we are running in S-mode and can use SBI calls
273 config RISCV_SBI
274 bool
275 depends on !RISCV_M_MODE
276 default y
277
278 config MMU
279 bool "MMU-based Paged Memory Management Support"
280 default y
281 help
282 Select if you want MMU-based virtualised addressing space
283 support by paged memory management. If unsure, say 'Y'.
284
285 config PAGE_OFFSET
286 hex
287 default 0x80000000 if !MMU && RISCV_M_MODE
288 default 0x80200000 if !MMU
289 default 0xc0000000 if 32BIT
290 default 0xff60000000000000 if 64BIT
291
292 config KASAN_SHADOW_OFFSET
293 hex
294 depends on KASAN_GENERIC
295 default 0xdfffffff00000000 if 64BIT
296 default 0xffffffff if 32BIT
297
298 config ARCH_FLATMEM_ENABLE
299 def_bool !NUMA
300
301 config ARCH_SPARSEMEM_ENABLE
302 def_bool y
303 depends on MMU
304 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM
305 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT
306
307 config ARCH_SELECT_MEMORY_MODEL
308 def_bool ARCH_SPARSEMEM_ENABLE
309
310 config ARCH_SUPPORTS_UPROBES
311 def_bool y
312
313 config STACKTRACE_SUPPORT
314 def_bool y
315
316 config GENERIC_BUG
317 def_bool y
318 depends on BUG
319 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
320
321 config GENERIC_BUG_RELATIVE_POINTERS
322 bool
323
324 config GENERIC_CALIBRATE_DELAY
325 def_bool y
326
327 config GENERIC_CSUM
328 def_bool y
329
330 config GENERIC_HWEIGHT
331 def_bool y
332
333 config FIX_EARLYCON_MEM
334 def_bool MMU
335
336 config ILLEGAL_POINTER_VALUE
337 hex
338 default 0 if 32BIT
339 default 0xdead000000000000 if 64BIT
340
341 config PGTABLE_LEVELS
342 int
343 default 5 if 64BIT
344 default 2
345
346 config LOCKDEP_SUPPORT
347 def_bool y
348
349 config RISCV_DMA_NONCOHERENT
350 bool
351 select ARCH_HAS_DMA_PREP_COHERENT
352 select ARCH_HAS_SETUP_DMA_OPS
353 select ARCH_HAS_SYNC_DMA_FOR_CPU
354 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
355 select DMA_BOUNCE_UNALIGNED_KMALLOC if SWIOTLB
356
357 config RISCV_NONSTANDARD_CACHE_OPS
358 bool
359 help
360 This enables function pointer support for non-standard noncoherent
361 systems to handle cache management.
362
363 config AS_HAS_INSN
364 def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)
365
366 config AS_HAS_OPTION_ARCH
367 # https://github.com/llvm/llvm-project/commit/9e8ed3403c191ab9c4903e8eeb8f732ff8a43cb4
368 def_bool y
369 depends on $(as-instr, .option arch$(comma) +m)
370
371 source "arch/riscv/Kconfig.socs"
372 source "arch/riscv/Kconfig.errata"
373
374 menu "Platform type"
375
376 config NONPORTABLE
377 bool "Allow configurations that result in non-portable kernels"
378 help
379 RISC-V kernel binaries are compatible between all known systems
380 whenever possible, but there are some use cases that can only be
381 satisfied by configurations that result in kernel binaries that are
382 not portable between systems.
383
384 Selecting N does not guarantee kernels will be portable to all known
385 systems. Selecting any of the options guarded by NONPORTABLE will
386 result in kernel binaries that are unlikely to be portable between
387 systems.
388
389 If unsure, say N.
390
391 choice
392 prompt "Base ISA"
393 default ARCH_RV64I
394 help
395 This selects the base ISA that this kernel will target and must match
396 the target platform.
397
398 config ARCH_RV32I
399 bool "RV32I"
400 depends on NONPORTABLE
401 select 32BIT
402 select GENERIC_LIB_ASHLDI3
403 select GENERIC_LIB_ASHRDI3
404 select GENERIC_LIB_LSHRDI3
405 select GENERIC_LIB_UCMPDI2
406
407 config ARCH_RV64I
408 bool "RV64I"
409 select 64BIT
410 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
411 select SWIOTLB if MMU
412
413 endchoice
414
415 # We must be able to map all physical memory into the kernel, but the compiler
416 # is still a bit more efficient when generating code if it's setup in a manner
417 # such that it can only map 2GiB of memory.
418 choice
419 prompt "Kernel Code Model"
420 default CMODEL_MEDLOW if 32BIT
421 default CMODEL_MEDANY if 64BIT
422
423 config CMODEL_MEDLOW
424 bool "medium low code model"
425 config CMODEL_MEDANY
426 bool "medium any code model"
427 endchoice
428
429 config MODULE_SECTIONS
430 bool
431 select HAVE_MOD_ARCH_SPECIFIC
432
433 config SMP
434 bool "Symmetric Multi-Processing"
435 help
436 This enables support for systems with more than one CPU. If
437 you say N here, the kernel will run on single and
438 multiprocessor machines, but will use only one CPU of a
439 multiprocessor machine. If you say Y here, the kernel will run
440 on many, but not all, single processor machines. On a single
441 processor machine, the kernel will run faster if you say N
442 here.
443
444 If you don't know what to do here, say N.
445
446 config SCHED_MC
447 bool "Multi-core scheduler support"
448 depends on SMP
449 help
450 Multi-core scheduler support improves the CPU scheduler's decision
451 making when dealing with multi-core CPU chips at a cost of slightly
452 increased overhead in some places. If unsure say N here.
453
454 config NR_CPUS
455 int "Maximum number of CPUs (2-512)"
456 depends on SMP
457 range 2 512 if !RISCV_SBI_V01
458 range 2 32 if RISCV_SBI_V01 && 32BIT
459 range 2 64 if RISCV_SBI_V01 && 64BIT
460 default "32" if 32BIT
461 default "64" if 64BIT
462
463 config HOTPLUG_CPU
464 bool "Support for hot-pluggable CPUs"
465 depends on SMP
466 select GENERIC_IRQ_MIGRATION
467 help
468
469 Say Y here to experiment with turning CPUs off and on. CPUs
470 can be controlled through /sys/devices/system/cpu.
471
472 Say N if you want to disable CPU hotplug.
473
474 choice
475 prompt "CPU Tuning"
476 default TUNE_GENERIC
477
478 config TUNE_GENERIC
479 bool "generic"
480
481 endchoice
482
483 # Common NUMA Features
484 config NUMA
485 bool "NUMA Memory Allocation and Scheduler Support"
486 depends on SMP && MMU
487 select ARCH_SUPPORTS_NUMA_BALANCING
488 select GENERIC_ARCH_NUMA
489 select HAVE_SETUP_PER_CPU_AREA
490 select NEED_PER_CPU_EMBED_FIRST_CHUNK
491 select NEED_PER_CPU_PAGE_FIRST_CHUNK
492 select OF_NUMA
493 select USE_PERCPU_NUMA_NODE_ID
494 help
495 Enable NUMA (Non-Uniform Memory Access) support.
496
497 The kernel will try to allocate memory used by a CPU on the
498 local memory of the CPU and add some more NUMA awareness to the kernel.
499
500 config NODES_SHIFT
501 int "Maximum NUMA Nodes (as a power of 2)"
502 range 1 10
503 default "2"
504 depends on NUMA
505 help
506 Specify the maximum number of NUMA Nodes available on the target
507 system. Increases memory reserved to accommodate various tables.
508
509 config RISCV_ALTERNATIVE
510 bool
511 depends on !XIP_KERNEL
512 help
513 This Kconfig allows the kernel to automatically patch the
514 erratum or cpufeature required by the execution platform at run
515 time. The code patching overhead is minimal, as it's only done
516 once at boot and once on each module load.
517
518 config RISCV_ALTERNATIVE_EARLY
519 bool
520 depends on RISCV_ALTERNATIVE
521 help
522 Allows early patching of the kernel for special errata
523
524 config RISCV_ISA_C
525 bool "Emit compressed instructions when building Linux"
526 default y
527 help
528 Adds "C" to the ISA subsets that the toolchain is allowed to emit
529 when building Linux, which results in compressed instructions in the
530 Linux binary.
531
532 If you don't know what to do here, say Y.
533
534 config RISCV_ISA_SVNAPOT
535 bool "Svnapot extension support for supervisor mode NAPOT pages"
536 depends on 64BIT && MMU
537 depends on RISCV_ALTERNATIVE
538 default y
539 help
540 Allow kernel to detect the Svnapot ISA-extension dynamically at boot
541 time and enable its usage.
542
543 The Svnapot extension is used to mark contiguous PTEs as a range
544 of contiguous virtual-to-physical translations for a naturally
545 aligned power-of-2 (NAPOT) granularity larger than the base 4KB page
546 size. When HUGETLBFS is also selected this option unconditionally
547 allocates some memory for each NAPOT page size supported by the kernel.
548 When optimizing for low memory consumption and for platforms without
549 the Svnapot extension, it may be better to say N here.
550
551 If you don't know what to do here, say Y.
552
553 config RISCV_ISA_SVPBMT
554 bool "Svpbmt extension support for supervisor mode page-based memory types"
555 depends on 64BIT && MMU
556 depends on RISCV_ALTERNATIVE
557 default y
558 help
559 Adds support to dynamically detect the presence of the Svpbmt
560 ISA-extension (Supervisor-mode: page-based memory types) and
561 enable its usage.
562
563 The memory type for a page contains a combination of attributes
564 that indicate the cacheability, idempotency, and ordering
565 properties for access to that page.
566
567 The Svpbmt extension is only available on 64-bit cpus.
568
569 If you don't know what to do here, say Y.
570
571 config TOOLCHAIN_HAS_V
572 bool
573 default y
574 depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64imv)
575 depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32imv)
576 depends on LLD_VERSION >= 140000 || LD_VERSION >= 23800
577 depends on AS_HAS_OPTION_ARCH
578
579 config RISCV_ISA_V
580 bool "VECTOR extension support"
581 depends on TOOLCHAIN_HAS_V
582 depends on FPU
583 select DYNAMIC_SIGFRAME
584 default y
585 help
586 Say N here if you want to disable all vector related procedure
587 in the kernel.
588
589 If you don't know what to do here, say Y.
590
591 config RISCV_ISA_V_DEFAULT_ENABLE
592 bool "Enable userspace Vector by default"
593 depends on RISCV_ISA_V
594 default y
595 help
596 Say Y here if you want to enable Vector in userspace by default.
597 Otherwise, userspace has to make explicit prctl() call to enable
598 Vector, or enable it via the sysctl interface.
599
600 If you don't know what to do here, say Y.
601
602 config RISCV_ISA_V_UCOPY_THRESHOLD
603 int "Threshold size for vectorized user copies"
604 depends on RISCV_ISA_V
605 default 768
606 help
607 Prefer using vectorized copy_to_user()/copy_from_user() when the
608 workload size exceeds this value.
609
610 config RISCV_ISA_V_PREEMPTIVE
611 bool "Run kernel-mode Vector with kernel preemption"
612 depends on PREEMPTION
613 depends on RISCV_ISA_V
614 default y
615 help
616 Usually, in-kernel SIMD routines are run with preemption disabled.
617 Functions which envoke long running SIMD thus must yield core's
618 vector unit to prevent blocking other tasks for too long.
619
620 This config allows kernel to run SIMD without explicitly disable
621 preemption. Enabling this config will result in higher memory
622 consumption due to the allocation of per-task's kernel Vector context.
623
624 config RISCV_ISA_ZAWRS
625 bool "Zawrs extension support for more efficient busy waiting"
626 depends on RISCV_ALTERNATIVE
627 default y
628 help
629 The Zawrs extension defines instructions to be used in polling loops
630 which allow a hart to enter a low-power state or to trap to the
631 hypervisor while waiting on a store to a memory location. Enable the
632 use of these instructions in the kernel when the Zawrs extension is
633 detected at boot.
634
635 If you don't know what to do here, say Y.
636
637 config TOOLCHAIN_HAS_ZBB
638 bool
639 default y
640 depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbb)
641 depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbb)
642 depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
643 depends on AS_HAS_OPTION_ARCH
644
645 # This symbol indicates that the toolchain supports all v1.0 vector crypto
646 # extensions, including Zvk*, Zvbb, and Zvbc. LLVM added all of these at once.
647 # binutils added all except Zvkb, then added Zvkb. So we just check for Zvkb.
648 config TOOLCHAIN_HAS_VECTOR_CRYPTO
649 def_bool $(as-instr, .option arch$(comma) +v$(comma) +zvkb)
650 depends on AS_HAS_OPTION_ARCH
651
652 config RISCV_ISA_ZBA
653 bool "Zba extension support for bit manipulation instructions"
654 default y
655 help
656 Add support for enabling optimisations in the kernel when the Zba
657 extension is detected at boot.
658
659 The Zba extension provides instructions to accelerate the generation
660 of addresses that index into arrays of basic data types.
661
662 If you don't know what to do here, say Y.
663
664 config RISCV_ISA_ZBB
665 bool "Zbb extension support for bit manipulation instructions"
666 depends on TOOLCHAIN_HAS_ZBB
667 depends on RISCV_ALTERNATIVE
668 default y
669 help
670 Adds support to dynamically detect the presence of the ZBB
671 extension (basic bit manipulation) and enable its usage.
672
673 The Zbb extension provides instructions to accelerate a number
674 of bit-specific operations (count bit population, sign extending,
675 bitrotation, etc).
676
677 If you don't know what to do here, say Y.
678
679 config TOOLCHAIN_HAS_ZBC
680 bool
681 default y
682 depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbc)
683 depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbc)
684 depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
685 depends on AS_HAS_OPTION_ARCH
686
687 config RISCV_ISA_ZBC
688 bool "Zbc extension support for carry-less multiplication instructions"
689 depends on TOOLCHAIN_HAS_ZBC
690 depends on MMU
691 depends on RISCV_ALTERNATIVE
692 default y
693 help
694 Adds support to dynamically detect the presence of the Zbc
695 extension (carry-less multiplication) and enable its usage.
696
697 The Zbc extension could accelerate CRC (cyclic redundancy check)
698 calculations.
699
700 If you don't know what to do here, say Y.
701
702 config RISCV_ISA_ZICBOM
703 bool "Zicbom extension support for non-coherent DMA operation"
704 depends on MMU
705 depends on RISCV_ALTERNATIVE
706 default y
707 select RISCV_DMA_NONCOHERENT
708 select DMA_DIRECT_REMAP
709 help
710 Adds support to dynamically detect the presence of the ZICBOM
711 extension (Cache Block Management Operations) and enable its
712 usage.
713
714 The Zicbom extension can be used to handle for example
715 non-coherent DMA support on devices that need it.
716
717 If you don't know what to do here, say Y.
718
719 config RISCV_ISA_ZICBOZ
720 bool "Zicboz extension support for faster zeroing of memory"
721 depends on RISCV_ALTERNATIVE
722 default y
723 help
724 Enable the use of the Zicboz extension (cbo.zero instruction)
725 when available.
726
727 The Zicboz extension is used for faster zeroing of memory.
728
729 If you don't know what to do here, say Y.
730
731 config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
732 def_bool y
733 # https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6dc
734 # https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=98416dbb0a62579d4a7a4a76bab51b5b52fec2cd
735 depends on AS_IS_GNU && AS_VERSION >= 23600
736 help
737 Binutils-2.38 and GCC-12.1.0 bumped the default ISA spec to the newer
738 20191213 version, which moves some instructions from the I extension to
739 the Zicsr and Zifencei extensions. This requires explicitly specifying
740 Zicsr and Zifencei when binutils >= 2.38 or GCC >= 12.1.0. Zicsr
741 and Zifencei are supported in binutils from version 2.36 onwards.
742 To make life easier, and avoid forcing toolchains that default to a
743 newer ISA spec to version 2.2, relax the check to binutils >= 2.36.
744 For clang < 17 or GCC < 11.3.0, for which this is not possible or need
745 special treatment, this is dealt with in TOOLCHAIN_NEEDS_OLD_ISA_SPEC.
746
747 config TOOLCHAIN_NEEDS_OLD_ISA_SPEC
748 def_bool y
749 depends on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
750 # https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
751 # https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=d29f5d6ab513c52fd872f532c492e35ae9fd6671
752 depends on (CC_IS_CLANG && CLANG_VERSION < 170000) || (CC_IS_GCC && GCC_VERSION < 110300)
753 help
754 Certain versions of clang and GCC do not support zicsr and zifencei via
755 -march. This option causes an older ISA spec compatible with these older
756 versions of clang and GCC to be passed to GAS, which has the same result
757 as passing zicsr and zifencei to -march.
758
759 config FPU
760 bool "FPU support"
761 default y
762 help
763 Say N here if you want to disable all floating-point related procedure
764 in the kernel.
765
766 If you don't know what to do here, say Y.
767
768 config IRQ_STACKS
769 bool "Independent irq & softirq stacks" if EXPERT
770 default y
771 select HAVE_IRQ_EXIT_ON_IRQ_STACK
772 select HAVE_SOFTIRQ_ON_OWN_STACK
773 help
774 Add independent irq & softirq stacks for percpu to prevent kernel stack
775 overflows. We may save some memory footprint by disabling IRQ_STACKS.
776
777 config THREAD_SIZE_ORDER
778 int "Kernel stack size (in power-of-two numbers of page size)" if VMAP_STACK && EXPERT
779 range 0 4
780 default 1 if 32BIT
781 default 2
782 help
783 Specify the Pages of thread stack size (from 4KB to 64KB), which also
784 affects irq stack size, which is equal to thread stack size.
785
786 config RISCV_MISALIGNED
787 bool
788 select SYSCTL_ARCH_UNALIGN_ALLOW
789 help
790 Embed support for emulating misaligned loads and stores.
791
792 choice
793 prompt "Unaligned Accesses Support"
794 default RISCV_PROBE_UNALIGNED_ACCESS
795 help
796 This determines the level of support for unaligned accesses. This
797 information is used by the kernel to perform optimizations. It is also
798 exposed to user space via the hwprobe syscall. The hardware will be
799 probed at boot by default.
800
801 config RISCV_PROBE_UNALIGNED_ACCESS
802 bool "Probe for hardware unaligned access support"
803 select RISCV_MISALIGNED
804 help
805 During boot, the kernel will run a series of tests to determine the
806 speed of unaligned accesses. This probing will dynamically determine
807 the speed of unaligned accesses on the underlying system. If unaligned
808 memory accesses trap into the kernel as they are not supported by the
809 system, the kernel will emulate the unaligned accesses to preserve the
810 UABI.
811
812 config RISCV_EMULATED_UNALIGNED_ACCESS
813 bool "Emulate unaligned access where system support is missing"
814 select RISCV_MISALIGNED
815 help
816 If unaligned memory accesses trap into the kernel as they are not
817 supported by the system, the kernel will emulate the unaligned
818 accesses to preserve the UABI. When the underlying system does support
819 unaligned accesses, the unaligned accesses are assumed to be slow.
820
821 config RISCV_SLOW_UNALIGNED_ACCESS
822 bool "Assume the system supports slow unaligned memory accesses"
823 depends on NONPORTABLE
824 help
825 Assume that the system supports slow unaligned memory accesses. The
826 kernel and userspace programs may not be able to run at all on systems
827 that do not support unaligned memory accesses.
828
829 config RISCV_EFFICIENT_UNALIGNED_ACCESS
830 bool "Assume the system supports fast unaligned memory accesses"
831 depends on NONPORTABLE
832 select DCACHE_WORD_ACCESS if MMU
833 select HAVE_EFFICIENT_UNALIGNED_ACCESS
834 help
835 Assume that the system supports fast unaligned memory accesses. When
836 enabled, this option improves the performance of the kernel on such
837 systems. However, the kernel and userspace programs will run much more
838 slowly, or will not be able to run at all, on systems that do not
839 support efficient unaligned memory accesses.
840
841 endchoice
842
843 source "arch/riscv/Kconfig.vendor"
844
845 endmenu # "Platform type"
846
847 menu "Kernel features"
848
849 source "kernel/Kconfig.hz"
850
851 config RISCV_SBI_V01
852 bool "SBI v0.1 support"
853 depends on RISCV_SBI
854 help
855 This config allows kernel to use SBI v0.1 APIs. This will be
856 deprecated in future once legacy M-mode software are no longer in use.
857
858 config RISCV_BOOT_SPINWAIT
859 bool "Spinwait booting method"
860 depends on SMP
861 default y if RISCV_SBI_V01 || RISCV_M_MODE
862 help
863 This enables support for booting Linux via spinwait method. In the
864 spinwait method, all cores randomly jump to Linux. One of the cores
865 gets chosen via lottery and all other keep spinning on a percpu
866 variable. This method cannot support CPU hotplug and sparse hartid
867 scheme. It should be only enabled for M-mode Linux or platforms relying
868 on older firmware without SBI HSM extension. All other platforms should
869 rely on ordered booting via SBI HSM extension which gets chosen
870 dynamically at runtime if the firmware supports it.
871
872 Since spinwait is incompatible with sparse hart IDs, it requires
873 NR_CPUS be large enough to contain the physical hart ID of the first
874 hart to enter Linux.
875
876 If unsure what to do here, say N.
877
878 config ARCH_SUPPORTS_KEXEC
879 def_bool y
880
881 config ARCH_SELECTS_KEXEC
882 def_bool y
883 depends on KEXEC
884 select HOTPLUG_CPU if SMP
885
886 config ARCH_SUPPORTS_KEXEC_FILE
887 def_bool 64BIT
888
889 config ARCH_SELECTS_KEXEC_FILE
890 def_bool y
891 depends on KEXEC_FILE
892 select HAVE_IMA_KEXEC if IMA
893 select KEXEC_ELF
894
895 config ARCH_SUPPORTS_KEXEC_PURGATORY
896 def_bool ARCH_SUPPORTS_KEXEC_FILE
897
898 config ARCH_SUPPORTS_CRASH_DUMP
899 def_bool y
900
901 config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
902 def_bool CRASH_RESERVE
903
904 config COMPAT
905 bool "Kernel support for 32-bit U-mode"
906 default 64BIT
907 depends on 64BIT && MMU
908 help
909 This option enables support for a 32-bit U-mode running under a 64-bit
910 kernel at S-mode. riscv32-specific components such as system calls,
911 the user helper functions (vdso), signal rt_frame functions and the
912 ptrace interface are handled appropriately by the kernel.
913
914 If you want to execute 32-bit userspace applications, say Y.
915
916 config PARAVIRT
917 bool "Enable paravirtualization code"
918 depends on RISCV_SBI
919 help
920 This changes the kernel so it can modify itself when it is run
921 under a hypervisor, potentially improving performance significantly
922 over full virtualization.
923
924 config PARAVIRT_TIME_ACCOUNTING
925 bool "Paravirtual steal time accounting"
926 depends on PARAVIRT
927 help
928 Select this option to enable fine granularity task steal time
929 accounting. Time spent executing other tasks in parallel with
930 the current vCPU is discounted from the vCPU power. To account for
931 that, there can be a small performance impact.
932
933 If in doubt, say N here.
934
935 config RELOCATABLE
936 bool "Build a relocatable kernel"
937 depends on MMU && 64BIT && !XIP_KERNEL
938 select MODULE_SECTIONS if MODULES
939 help
940 This builds a kernel as a Position Independent Executable (PIE),
941 which retains all relocation metadata required to relocate the
942 kernel binary at runtime to a different virtual address than the
943 address it was linked at.
944 Since RISCV uses the RELA relocation format, this requires a
945 relocation pass at runtime even if the kernel is loaded at the
946 same address it was linked at.
947
948 If unsure, say N.
949
950 config RANDOMIZE_BASE
951 bool "Randomize the address of the kernel image"
952 select RELOCATABLE
953 depends on MMU && 64BIT && !XIP_KERNEL
954 help
955 Randomizes the virtual address at which the kernel image is
956 loaded, as a security feature that deters exploit attempts
957 relying on knowledge of the location of kernel internals.
958
959 It is the bootloader's job to provide entropy, by passing a
960 random u64 value in /chosen/kaslr-seed at kernel entry.
961
962 When booting via the UEFI stub, it will invoke the firmware's
963 EFI_RNG_PROTOCOL implementation (if available) to supply entropy
964 to the kernel proper. In addition, it will randomise the physical
965 location of the kernel Image as well.
966
967 If unsure, say N.
968
969 endmenu # "Kernel features"
970
971 menu "Boot options"
972
973 config CMDLINE
974 string "Built-in kernel command line"
975 help
976 For most platforms, the arguments for the kernel's command line
977 are provided at run-time, during boot. However, there are cases
978 where either no arguments are being provided or the provided
979 arguments are insufficient or even invalid.
980
981 When that occurs, it is possible to define a built-in command
982 line here and choose how the kernel should use it later on.
983
984 choice
985 prompt "Built-in command line usage"
986 depends on CMDLINE != ""
987 default CMDLINE_FALLBACK
988 help
989 Choose how the kernel will handle the provided built-in command
990 line.
991
992 config CMDLINE_FALLBACK
993 bool "Use bootloader kernel arguments if available"
994 help
995 Use the built-in command line as fallback in case we get nothing
996 during boot. This is the default behaviour.
997
998 config CMDLINE_EXTEND
999 bool "Extend bootloader kernel arguments"
1000 help
1001 The command-line arguments provided during boot will be
1002 appended to the built-in command line. This is useful in
1003 cases where the provided arguments are insufficient and
1004 you don't want to or cannot modify them.
1005
1006 config CMDLINE_FORCE
1007 bool "Always use the default kernel command string"
1008 help
1009 Always use the built-in command line, even if we get one during
1010 boot. This is useful in case you need to override the provided
1011 command line on systems where you don't have or want control
1012 over it.
1013
1014 endchoice
1015
1016 config EFI_STUB
1017 bool
1018
1019 config EFI
1020 bool "UEFI runtime support"
1021 depends on OF && !XIP_KERNEL
1022 depends on MMU
1023 default y
1024 select ARCH_SUPPORTS_ACPI if 64BIT
1025 select EFI_GENERIC_STUB
1026 select EFI_PARAMS_FROM_FDT
1027 select EFI_RUNTIME_WRAPPERS
1028 select EFI_STUB
1029 select LIBFDT
1030 select RISCV_ISA_C
1031 select UCS2_STRING
1032 help
1033 This option provides support for runtime services provided
1034 by UEFI firmware (such as non-volatile variables, realtime
1035 clock, and platform reset). A UEFI stub is also provided to
1036 allow the kernel to be booted as an EFI application. This
1037 is only useful on systems that have UEFI firmware.
1038
1039 config DMI
1040 bool "Enable support for SMBIOS (DMI) tables"
1041 depends on EFI
1042 default y
1043 help
1044 This enables SMBIOS/DMI feature for systems.
1045
1046 This option is only useful on systems that have UEFI firmware.
1047 However, even with this option, the resultant kernel should
1048 continue to boot on existing non-UEFI platforms.
1049
1050 config CC_HAVE_STACKPROTECTOR_TLS
1051 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0)
1052
1053 config STACKPROTECTOR_PER_TASK
1054 def_bool y
1055 depends on !RANDSTRUCT
1056 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
1057
1058 config PHYS_RAM_BASE_FIXED
1059 bool "Explicitly specified physical RAM address"
1060 depends on NONPORTABLE
1061 default n
1062
1063 config PHYS_RAM_BASE
1064 hex "Platform Physical RAM address"
1065 depends on PHYS_RAM_BASE_FIXED
1066 default "0x80000000"
1067 help
1068 This is the physical address of RAM in the system. It has to be
1069 explicitly specified to run early relocations of read-write data
1070 from flash to RAM.
1071
1072 config XIP_KERNEL
1073 bool "Kernel Execute-In-Place from ROM"
1074 depends on MMU && SPARSEMEM && NONPORTABLE
1075 # This prevents XIP from being enabled by all{yes,mod}config, which
1076 # fail to build since XIP doesn't support large kernels.
1077 depends on !COMPILE_TEST
1078 select PHYS_RAM_BASE_FIXED
1079 help
1080 Execute-In-Place allows the kernel to run from non-volatile storage
1081 directly addressable by the CPU, such as NOR flash. This saves RAM
1082 space since the text section of the kernel is not loaded from flash
1083 to RAM. Read-write sections, such as the data section and stack,
1084 are still copied to RAM. The XIP kernel is not compressed since
1085 it has to run directly from flash, so it will take more space to
1086 store it. The flash address used to link the kernel object files,
1087 and for storing it, is configuration dependent. Therefore, if you
1088 say Y here, you must know the proper physical address where to
1089 store the kernel image depending on your own flash memory usage.
1090
1091 Also note that the make target becomes "make xipImage" rather than
1092 "make zImage" or "make Image". The final kernel binary to put in
1093 ROM memory will be arch/riscv/boot/xipImage.
1094
1095 SPARSEMEM is required because the kernel text and rodata that are
1096 flash resident are not backed by memmap, then any attempt to get
1097 a struct page on those regions will trigger a fault.
1098
1099 If unsure, say N.
1100
1101 config XIP_PHYS_ADDR
1102 hex "XIP Kernel Physical Location"
1103 depends on XIP_KERNEL
1104 default "0x21000000"
1105 help
1106 This is the physical address in your flash memory the kernel will
1107 be linked for and stored to. This address is dependent on your
1108 own flash usage.
1109
1110 config RISCV_ISA_FALLBACK
1111 bool "Permit falling back to parsing riscv,isa for extension support by default"
1112 default y
1113 help
1114 Parsing the "riscv,isa" devicetree property has been deprecated and
1115 replaced by a list of explicitly defined strings. For compatibility
1116 with existing platforms, the kernel will fall back to parsing the
1117 "riscv,isa" property if the replacements are not found.
1118
1119 Selecting N here will result in a kernel that does not use the
1120 fallback, unless the commandline "riscv_isa_fallback" parameter is
1121 present.
1122
1123 Please see the dt-binding, located at
1124 Documentation/devicetree/bindings/riscv/extensions.yaml for details
1125 on the replacement properties, "riscv,isa-base" and
1126 "riscv,isa-extensions".
1127
1128 config BUILTIN_DTB
1129 bool "Built-in device tree"
1130 depends on OF && NONPORTABLE
1131 help
1132 Build a device tree into the Linux image.
1133 This option should be selected if no bootloader is being used.
1134 If unsure, say N.
1135
1136
1137 config BUILTIN_DTB_SOURCE
1138 string "Built-in device tree source"
1139 depends on BUILTIN_DTB
1140 help
1141 DTS file path (without suffix, relative to arch/riscv/boot/dts)
1142 for the DTS file that will be used to produce the DTB linked into the
1143 kernel.
1144
1145 endmenu # "Boot options"
1146
1147 config PORTABLE
1148 bool
1149 default !NONPORTABLE
1150 select EFI
1151 select MMU
1152 select OF
1153
1154 config ARCH_PROC_KCORE_TEXT
1155 def_bool y
1156
1157 menu "Power management options"
1158
1159 source "kernel/power/Kconfig"
1160
1161 config ARCH_HIBERNATION_POSSIBLE
1162 def_bool y
1163
1164 config ARCH_HIBERNATION_HEADER
1165 def_bool HIBERNATION
1166
1167 config ARCH_SUSPEND_POSSIBLE
1168 def_bool y
1169
1170 endmenu # "Power management options"
1171
1172 menu "CPU Power Management"
1173
1174 source "drivers/cpuidle/Kconfig"
1175
1176 source "drivers/cpufreq/Kconfig"
1177
1178 endmenu # "CPU Power Management"
1179
1180 source "arch/riscv/kvm/Kconfig"
1181
1182 source "drivers/acpi/Kconfig"
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.