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
7config 64BIT
8	bool
9
10config 32BIT
11	bool
12
13config 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
212config 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
219config 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
224config GCC_SUPPORTS_DYNAMIC_FTRACE
225	def_bool CC_IS_GCC
226	depends on $(cc-option,-fpatchable-function-entry=8)
227
228config 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
233config 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
239config 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
247config ARCH_MMAP_RND_BITS_MIN
248	default 18 if 64BIT
249	default 8
250
251config ARCH_MMAP_RND_COMPAT_BITS_MIN
252	default 8
253
254# max bits determined by the following formula:
255#  VA_BITS - PAGE_SHIFT - 3
256config ARCH_MMAP_RND_BITS_MAX
257	default 24 if 64BIT # SV39 based
258	default 17
259
260config 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
264config 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
273config RISCV_SBI
274	bool
275	depends on !RISCV_M_MODE
276	default y
277
278config 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
285config 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
292config KASAN_SHADOW_OFFSET
293	hex
294	depends on KASAN_GENERIC
295	default 0xdfffffff00000000 if 64BIT
296	default 0xffffffff if 32BIT
297
298config ARCH_FLATMEM_ENABLE
299	def_bool !NUMA
300
301config 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
307config ARCH_SELECT_MEMORY_MODEL
308	def_bool ARCH_SPARSEMEM_ENABLE
309
310config ARCH_SUPPORTS_UPROBES
311	def_bool y
312
313config STACKTRACE_SUPPORT
314	def_bool y
315
316config GENERIC_BUG
317	def_bool y
318	depends on BUG
319	select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
320
321config GENERIC_BUG_RELATIVE_POINTERS
322	bool
323
324config GENERIC_CALIBRATE_DELAY
325	def_bool y
326
327config GENERIC_CSUM
328	def_bool y
329
330config GENERIC_HWEIGHT
331	def_bool y
332
333config FIX_EARLYCON_MEM
334	def_bool MMU
335
336config ILLEGAL_POINTER_VALUE
337	hex
338	default 0 if 32BIT
339	default 0xdead000000000000 if 64BIT
340
341config PGTABLE_LEVELS
342	int
343	default 5 if 64BIT
344	default 2
345
346config LOCKDEP_SUPPORT
347	def_bool y
348
349config 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
357config 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
363config AS_HAS_INSN
364	def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)
365
366config 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
371source "arch/riscv/Kconfig.socs"
372source "arch/riscv/Kconfig.errata"
373
374menu "Platform type"
375
376config 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
391choice
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
398config 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
407config ARCH_RV64I
408	bool "RV64I"
409	select 64BIT
410	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
411	select SWIOTLB if MMU
412
413endchoice
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.
418choice
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"
427endchoice
428
429config MODULE_SECTIONS
430	bool
431	select HAVE_MOD_ARCH_SPECIFIC
432
433config 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
446config 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
454config 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
463config 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
474choice
475	prompt "CPU Tuning"
476	default TUNE_GENERIC
477
478config TUNE_GENERIC
479	bool "generic"
480
481endchoice
482
483# Common NUMA Features
484config 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
500config 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
509config 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
518config RISCV_ALTERNATIVE_EARLY
519	bool
520	depends on RISCV_ALTERNATIVE
521	help
522	  Allows early patching of the kernel for special errata
523
524config 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
534config 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
553config 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
571config 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
579config 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
591config 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
602config 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
610config 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
624config 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
637config 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.
648config TOOLCHAIN_HAS_VECTOR_CRYPTO
649	def_bool $(as-instr, .option arch$(comma) +v$(comma) +zvkb)
650	depends on AS_HAS_OPTION_ARCH
651
652config 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
664config 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
679config 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
687config 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
702config 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
719config 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
731config 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
747config 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
759config 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
768config 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
777config 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
786config RISCV_MISALIGNED
787	bool
788	select SYSCTL_ARCH_UNALIGN_ALLOW
789	help
790	  Embed support for emulating misaligned loads and stores.
791
792choice
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
801config 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
812config 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
821config 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
829config 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
841endchoice
842
843source "arch/riscv/Kconfig.vendor"
844
845endmenu # "Platform type"
846
847menu "Kernel features"
848
849source "kernel/Kconfig.hz"
850
851config 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
858config 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
878config ARCH_SUPPORTS_KEXEC
879	def_bool y
880
881config ARCH_SELECTS_KEXEC
882	def_bool y
883	depends on KEXEC
884	select HOTPLUG_CPU if SMP
885
886config ARCH_SUPPORTS_KEXEC_FILE
887	def_bool 64BIT
888
889config 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
895config ARCH_SUPPORTS_KEXEC_PURGATORY
896	def_bool ARCH_SUPPORTS_KEXEC_FILE
897
898config ARCH_SUPPORTS_CRASH_DUMP
899	def_bool y
900
901config ARCH_DEFAULT_CRASH_DUMP
902	def_bool y
903
904config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
905	def_bool CRASH_RESERVE
906
907config COMPAT
908	bool "Kernel support for 32-bit U-mode"
909	default 64BIT
910	depends on 64BIT && MMU
911	help
912	  This option enables support for a 32-bit U-mode running under a 64-bit
913	  kernel at S-mode. riscv32-specific components such as system calls,
914	  the user helper functions (vdso), signal rt_frame functions and the
915	  ptrace interface are handled appropriately by the kernel.
916
917	  If you want to execute 32-bit userspace applications, say Y.
918
919config PARAVIRT
920	bool "Enable paravirtualization code"
921	depends on RISCV_SBI
922	help
923	  This changes the kernel so it can modify itself when it is run
924	  under a hypervisor, potentially improving performance significantly
925	  over full virtualization.
926
927config PARAVIRT_TIME_ACCOUNTING
928	bool "Paravirtual steal time accounting"
929	depends on PARAVIRT
930	help
931	  Select this option to enable fine granularity task steal time
932	  accounting. Time spent executing other tasks in parallel with
933	  the current vCPU is discounted from the vCPU power. To account for
934	  that, there can be a small performance impact.
935
936	  If in doubt, say N here.
937
938config RELOCATABLE
939	bool "Build a relocatable kernel"
940	depends on MMU && 64BIT && !XIP_KERNEL
941	select MODULE_SECTIONS if MODULES
942	help
943          This builds a kernel as a Position Independent Executable (PIE),
944          which retains all relocation metadata required to relocate the
945          kernel binary at runtime to a different virtual address than the
946          address it was linked at.
947          Since RISCV uses the RELA relocation format, this requires a
948          relocation pass at runtime even if the kernel is loaded at the
949          same address it was linked at.
950
951          If unsure, say N.
952
953config RANDOMIZE_BASE
954        bool "Randomize the address of the kernel image"
955        select RELOCATABLE
956        depends on MMU && 64BIT && !XIP_KERNEL
957        help
958          Randomizes the virtual address at which the kernel image is
959          loaded, as a security feature that deters exploit attempts
960          relying on knowledge of the location of kernel internals.
961
962          It is the bootloader's job to provide entropy, by passing a
963          random u64 value in /chosen/kaslr-seed at kernel entry.
964
965          When booting via the UEFI stub, it will invoke the firmware's
966          EFI_RNG_PROTOCOL implementation (if available) to supply entropy
967          to the kernel proper. In addition, it will randomise the physical
968          location of the kernel Image as well.
969
970          If unsure, say N.
971
972endmenu # "Kernel features"
973
974menu "Boot options"
975
976config CMDLINE
977	string "Built-in kernel command line"
978	help
979	  For most platforms, the arguments for the kernel's command line
980	  are provided at run-time, during boot. However, there are cases
981	  where either no arguments are being provided or the provided
982	  arguments are insufficient or even invalid.
983
984	  When that occurs, it is possible to define a built-in command
985	  line here and choose how the kernel should use it later on.
986
987choice
988	prompt "Built-in command line usage"
989	depends on CMDLINE != ""
990	default CMDLINE_FALLBACK
991	help
992	  Choose how the kernel will handle the provided built-in command
993	  line.
994
995config CMDLINE_FALLBACK
996	bool "Use bootloader kernel arguments if available"
997	help
998	  Use the built-in command line as fallback in case we get nothing
999	  during boot. This is the default behaviour.
1000
1001config CMDLINE_EXTEND
1002	bool "Extend bootloader kernel arguments"
1003	help
1004	  The command-line arguments provided during boot will be
1005	  appended to the built-in command line. This is useful in
1006	  cases where the provided arguments are insufficient and
1007	  you don't want to or cannot modify them.
1008
1009config CMDLINE_FORCE
1010	bool "Always use the default kernel command string"
1011	help
1012	  Always use the built-in command line, even if we get one during
1013	  boot. This is useful in case you need to override the provided
1014	  command line on systems where you don't have or want control
1015	  over it.
1016
1017endchoice
1018
1019config EFI_STUB
1020	bool
1021
1022config EFI
1023	bool "UEFI runtime support"
1024	depends on OF && !XIP_KERNEL
1025	depends on MMU
1026	default y
1027	select ARCH_SUPPORTS_ACPI if 64BIT
1028	select EFI_GENERIC_STUB
1029	select EFI_PARAMS_FROM_FDT
1030	select EFI_RUNTIME_WRAPPERS
1031	select EFI_STUB
1032	select LIBFDT
1033	select RISCV_ISA_C
1034	select UCS2_STRING
1035	help
1036	  This option provides support for runtime services provided
1037	  by UEFI firmware (such as non-volatile variables, realtime
1038	  clock, and platform reset). A UEFI stub is also provided to
1039	  allow the kernel to be booted as an EFI application. This
1040	  is only useful on systems that have UEFI firmware.
1041
1042config DMI
1043	bool "Enable support for SMBIOS (DMI) tables"
1044	depends on EFI
1045	default y
1046	help
1047	  This enables SMBIOS/DMI feature for systems.
1048
1049	  This option is only useful on systems that have UEFI firmware.
1050	  However, even with this option, the resultant kernel should
1051	  continue to boot on existing non-UEFI platforms.
1052
1053config CC_HAVE_STACKPROTECTOR_TLS
1054	def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0)
1055
1056config STACKPROTECTOR_PER_TASK
1057	def_bool y
1058	depends on !RANDSTRUCT
1059	depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
1060
1061config PHYS_RAM_BASE_FIXED
1062	bool "Explicitly specified physical RAM address"
1063	depends on NONPORTABLE
1064	default n
1065
1066config PHYS_RAM_BASE
1067	hex "Platform Physical RAM address"
1068	depends on PHYS_RAM_BASE_FIXED
1069	default "0x80000000"
1070	help
1071	  This is the physical address of RAM in the system. It has to be
1072	  explicitly specified to run early relocations of read-write data
1073	  from flash to RAM.
1074
1075config XIP_KERNEL
1076	bool "Kernel Execute-In-Place from ROM"
1077	depends on MMU && SPARSEMEM && NONPORTABLE
1078	# This prevents XIP from being enabled by all{yes,mod}config, which
1079	# fail to build since XIP doesn't support large kernels.
1080	depends on !COMPILE_TEST
1081	select PHYS_RAM_BASE_FIXED
1082	help
1083	  Execute-In-Place allows the kernel to run from non-volatile storage
1084	  directly addressable by the CPU, such as NOR flash. This saves RAM
1085	  space since the text section of the kernel is not loaded from flash
1086	  to RAM.  Read-write sections, such as the data section and stack,
1087	  are still copied to RAM.  The XIP kernel is not compressed since
1088	  it has to run directly from flash, so it will take more space to
1089	  store it.  The flash address used to link the kernel object files,
1090	  and for storing it, is configuration dependent. Therefore, if you
1091	  say Y here, you must know the proper physical address where to
1092	  store the kernel image depending on your own flash memory usage.
1093
1094	  Also note that the make target becomes "make xipImage" rather than
1095	  "make zImage" or "make Image".  The final kernel binary to put in
1096	  ROM memory will be arch/riscv/boot/xipImage.
1097
1098	  SPARSEMEM is required because the kernel text and rodata that are
1099	  flash resident are not backed by memmap, then any attempt to get
1100	  a struct page on those regions will trigger a fault.
1101
1102	  If unsure, say N.
1103
1104config XIP_PHYS_ADDR
1105	hex "XIP Kernel Physical Location"
1106	depends on XIP_KERNEL
1107	default "0x21000000"
1108	help
1109	  This is the physical address in your flash memory the kernel will
1110	  be linked for and stored to.  This address is dependent on your
1111	  own flash usage.
1112
1113config RISCV_ISA_FALLBACK
1114	bool "Permit falling back to parsing riscv,isa for extension support by default"
1115	default y
1116	help
1117	  Parsing the "riscv,isa" devicetree property has been deprecated and
1118	  replaced by a list of explicitly defined strings. For compatibility
1119	  with existing platforms, the kernel will fall back to parsing the
1120	  "riscv,isa" property if the replacements are not found.
1121
1122	  Selecting N here will result in a kernel that does not use the
1123	  fallback, unless the commandline "riscv_isa_fallback" parameter is
1124	  present.
1125
1126	  Please see the dt-binding, located at
1127	  Documentation/devicetree/bindings/riscv/extensions.yaml for details
1128	  on the replacement properties, "riscv,isa-base" and
1129	  "riscv,isa-extensions".
1130
1131config BUILTIN_DTB
1132	bool "Built-in device tree"
1133	depends on OF && NONPORTABLE
1134	help
1135	  Build a device tree into the Linux image.
1136	  This option should be selected if no bootloader is being used.
1137	  If unsure, say N.
1138
1139
1140config BUILTIN_DTB_SOURCE
1141	string "Built-in device tree source"
1142	depends on BUILTIN_DTB
1143	help
1144	  DTS file path (without suffix, relative to arch/riscv/boot/dts)
1145	  for the DTS file that will be used to produce the DTB linked into the
1146	  kernel.
1147
1148endmenu # "Boot options"
1149
1150config PORTABLE
1151	bool
1152	default !NONPORTABLE
1153	select EFI
1154	select MMU
1155	select OF
1156
1157config ARCH_PROC_KCORE_TEXT
1158	def_bool y
1159
1160menu "Power management options"
1161
1162source "kernel/power/Kconfig"
1163
1164config ARCH_HIBERNATION_POSSIBLE
1165	def_bool y
1166
1167config ARCH_HIBERNATION_HEADER
1168	def_bool HIBERNATION
1169
1170config ARCH_SUSPEND_POSSIBLE
1171	def_bool y
1172
1173endmenu # "Power management options"
1174
1175menu "CPU Power Management"
1176
1177source "drivers/cpuidle/Kconfig"
1178
1179source "drivers/cpufreq/Kconfig"
1180
1181endmenu # "CPU Power Management"
1182
1183source "arch/riscv/kvm/Kconfig"
1184
1185source "drivers/acpi/Kconfig"
1186