| blob | cc63aef41e94e1a74be422beb51793b84fd11260 |
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 #
7 config 64BIT
8 bool
10 config 32BIT
11 bool
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_PREEMPT_LAZY
43 select ARCH_HAS_PREPARE_SYNC_CORE_CMD
44 select ARCH_HAS_PTE_DEVMAP if 64BIT && MMU
45 select ARCH_HAS_PTE_SPECIAL
46 select ARCH_HAS_SET_DIRECT_MAP if MMU
47 select ARCH_HAS_SET_MEMORY if MMU
48 select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
49 select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL
50 select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
51 select ARCH_HAS_SYSCALL_WRAPPER
52 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
53 select ARCH_HAS_UBSAN
54 select ARCH_HAS_VDSO_TIME_DATA
55 select ARCH_KEEP_MEMBLOCK if ACPI
56 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if 64BIT && MMU
57 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
58 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
59 select ARCH_STACKWALK
60 select ARCH_SUPPORTS_ATOMIC_RMW
61 select ARCH_SUPPORTS_CFI_CLANG
62 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU
63 select ARCH_SUPPORTS_HUGETLBFS if MMU
64 # LLD >= 14: https://github.com/llvm/llvm-project/issues/50505
65 select ARCH_SUPPORTS_LTO_CLANG if LLD_VERSION >= 140000
66 select ARCH_SUPPORTS_LTO_CLANG_THIN if LLD_VERSION >= 140000
67 select ARCH_SUPPORTS_PAGE_TABLE_CHECK if MMU
68 select ARCH_SUPPORTS_PER_VMA_LOCK if MMU
69 select ARCH_SUPPORTS_RT
70 select ARCH_SUPPORTS_SHADOW_CALL_STACK if HAVE_SHADOW_CALL_STACK
71 select ARCH_USE_CMPXCHG_LOCKREF if 64BIT
72 select ARCH_USE_MEMTEST
73 select ARCH_USE_QUEUED_RWLOCKS
74 select ARCH_USE_SYM_ANNOTATIONS
75 select ARCH_USES_CFI_TRAPS if CFI_CLANG
76 select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH if MMU
77 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
78 select ARCH_WANT_FRAME_POINTERS
79 select ARCH_WANT_GENERAL_HUGETLB if !RISCV_ISA_SVNAPOT
80 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
81 select ARCH_WANT_LD_ORPHAN_WARN if !XIP_KERNEL
82 select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP
83 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
84 select ARCH_WANTS_NO_INSTR
85 select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE
86 select ARCH_WEAK_RELEASE_ACQUIRE if ARCH_USE_QUEUED_SPINLOCKS
87 select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU
88 select BUILDTIME_TABLE_SORT if MMU
89 select CLINT_TIMER if RISCV_M_MODE
90 select CLONE_BACKWARDS
91 select COMMON_CLK
92 select CPU_PM if CPU_IDLE || HIBERNATION || SUSPEND
93 select EDAC_SUPPORT
94 select FRAME_POINTER if PERF_EVENTS || (FUNCTION_TRACER && !DYNAMIC_FTRACE)
95 select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if DYNAMIC_FTRACE
96 select GENERIC_ARCH_TOPOLOGY
97 select GENERIC_ATOMIC64 if !64BIT
98 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
99 select GENERIC_CPU_DEVICES
100 select GENERIC_CPU_VULNERABILITIES
101 select GENERIC_EARLY_IOREMAP
102 select GENERIC_ENTRY
103 select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
104 select GENERIC_IDLE_POLL_SETUP
105 select GENERIC_IOREMAP if MMU
106 select GENERIC_IRQ_IPI if SMP
107 select GENERIC_IRQ_IPI_MUX if SMP
108 select GENERIC_IRQ_MULTI_HANDLER
109 select GENERIC_IRQ_SHOW
110 select GENERIC_IRQ_SHOW_LEVEL
111 select GENERIC_LIB_DEVMEM_IS_ALLOWED
112 select GENERIC_PCI_IOMAP
113 select GENERIC_PTDUMP if MMU
114 select GENERIC_SCHED_CLOCK
115 select GENERIC_SMP_IDLE_THREAD
116 select GENERIC_TIME_VSYSCALL if MMU && 64BIT
117 select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO
118 select HARDIRQS_SW_RESEND
119 select HAS_IOPORT if MMU
120 select HAVE_ALIGNED_STRUCT_PAGE
121 select HAVE_ARCH_AUDITSYSCALL
122 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
123 select HAVE_ARCH_HUGE_VMAP if MMU && 64BIT
124 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
125 select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL
126 select HAVE_ARCH_KASAN if MMU && 64BIT
127 select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT
128 select HAVE_ARCH_KFENCE if MMU && 64BIT
129 select HAVE_ARCH_KGDB if !XIP_KERNEL
130 select HAVE_ARCH_KGDB_QXFER_PKT
131 select HAVE_ARCH_MMAP_RND_BITS if MMU
132 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
133 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
134 select HAVE_ARCH_SECCOMP_FILTER
135 select HAVE_ARCH_STACKLEAK
136 select HAVE_ARCH_THREAD_STRUCT_WHITELIST
137 select HAVE_ARCH_TRACEHOOK
138 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU
139 select HAVE_ARCH_USERFAULTFD_MINOR if 64BIT && USERFAULTFD
140 select HAVE_ARCH_VMAP_STACK if MMU && 64BIT
141 select HAVE_ASM_MODVERSIONS
142 select HAVE_CONTEXT_TRACKING_USER
143 select HAVE_DEBUG_KMEMLEAK
144 select HAVE_DMA_CONTIGUOUS if MMU
145 select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && (CLANG_SUPPORTS_DYNAMIC_FTRACE || GCC_SUPPORTS_DYNAMIC_FTRACE)
146 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
147 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if HAVE_DYNAMIC_FTRACE
148 select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
149 select HAVE_FUNCTION_GRAPH_TRACER
150 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
151 select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !PREEMPTION
152 select HAVE_EBPF_JIT if MMU
153 select HAVE_GUP_FAST if MMU
154 select HAVE_FUNCTION_ARG_ACCESS_API
155 select HAVE_FUNCTION_ERROR_INJECTION
156 select HAVE_GCC_PLUGINS
157 select HAVE_GENERIC_VDSO if MMU && 64BIT
158 select HAVE_IRQ_TIME_ACCOUNTING
159 select HAVE_KERNEL_BZIP2 if !XIP_KERNEL && !EFI_ZBOOT
160 select HAVE_KERNEL_GZIP if !XIP_KERNEL && !EFI_ZBOOT
161 select HAVE_KERNEL_LZ4 if !XIP_KERNEL && !EFI_ZBOOT
162 select HAVE_KERNEL_LZMA if !XIP_KERNEL && !EFI_ZBOOT
163 select HAVE_KERNEL_LZO if !XIP_KERNEL && !EFI_ZBOOT
164 select HAVE_KERNEL_UNCOMPRESSED if !XIP_KERNEL && !EFI_ZBOOT
165 select HAVE_KERNEL_ZSTD if !XIP_KERNEL && !EFI_ZBOOT
166 select HAVE_KERNEL_XZ if !XIP_KERNEL && !EFI_ZBOOT
167 select HAVE_KPROBES if !XIP_KERNEL
168 select HAVE_KRETPROBES if !XIP_KERNEL
169 # https://github.com/ClangBuiltLinux/linux/issues/1881
170 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if !LD_IS_LLD
171 select HAVE_MOVE_PMD
172 select HAVE_MOVE_PUD
173 select HAVE_PAGE_SIZE_4KB
174 select HAVE_PCI
175 select HAVE_PERF_EVENTS
176 select HAVE_PERF_REGS
177 select HAVE_PERF_USER_STACK_DUMP
178 select HAVE_POSIX_CPU_TIMERS_TASK_WORK
179 select HAVE_PREEMPT_DYNAMIC_KEY if !XIP_KERNEL
180 select HAVE_REGS_AND_STACK_ACCESS_API
181 select HAVE_RETHOOK if !XIP_KERNEL
182 select HAVE_RSEQ
183 select HAVE_RUST if RUSTC_SUPPORTS_RISCV && CC_IS_CLANG
184 select HAVE_SAMPLE_FTRACE_DIRECT
185 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
186 select HAVE_STACKPROTECTOR
187 select HAVE_SYSCALL_TRACEPOINTS
188 select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU
189 select IRQ_DOMAIN
190 select IRQ_FORCED_THREADING
191 select KASAN_VMALLOC if KASAN
192 select LOCK_MM_AND_FIND_VMA
193 select MMU_GATHER_RCU_TABLE_FREE if SMP && MMU
194 select MODULES_USE_ELF_RELA if MODULES
195 select OF
196 select OF_EARLY_FLATTREE
197 select OF_IRQ
198 select PCI_DOMAINS_GENERIC if PCI
199 select PCI_ECAM if (ACPI && PCI)
200 select PCI_MSI if PCI
201 select RISCV_ALTERNATIVE if !XIP_KERNEL
202 select RISCV_APLIC
203 select RISCV_IMSIC
204 select RISCV_INTC
205 select RISCV_TIMER if RISCV_SBI
206 select SIFIVE_PLIC
207 select SPARSE_IRQ
208 select SYSCTL_EXCEPTION_TRACE
209 select THREAD_INFO_IN_TASK
210 select TRACE_IRQFLAGS_SUPPORT
211 select UACCESS_MEMCPY if !MMU
212 select USER_STACKTRACE_SUPPORT
213 select ZONE_DMA32 if 64BIT
215 config RUSTC_SUPPORTS_RISCV
216 def_bool y
217 depends on 64BIT
218 # Shadow call stack requires rustc version 1.82+ due to use of the
219 # -Zsanitizer=shadow-call-stack flag.
220 depends on !SHADOW_CALL_STACK || RUSTC_VERSION >= 108200
222 config CLANG_SUPPORTS_DYNAMIC_FTRACE
223 def_bool CC_IS_CLANG
224 # https://github.com/ClangBuiltLinux/linux/issues/1817
225 depends on AS_IS_GNU || (AS_IS_LLVM && (LD_IS_LLD || LD_VERSION >= 23600))
227 config GCC_SUPPORTS_DYNAMIC_FTRACE
228 def_bool CC_IS_GCC
229 depends on $(cc-option,-fpatchable-function-entry=8)
231 config HAVE_SHADOW_CALL_STACK
232 def_bool $(cc-option,-fsanitize=shadow-call-stack)
233 # https://github.com/riscv-non-isa/riscv-elf-psabi-doc/commit/a484e843e6eeb51f0cb7b8819e50da6d2444d769
234 depends on $(ld-option,--no-relax-gp)
236 config RISCV_USE_LINKER_RELAXATION
237 def_bool y
238 # https://github.com/llvm/llvm-project/commit/6611d58f5bbcbec77262d392e2923e1d680f6985
239 depends on !LD_IS_LLD || LLD_VERSION >= 150000
241 # https://github.com/llvm/llvm-project/commit/bbc0f99f3bc96f1db16f649fc21dd18e5b0918f6
242 config ARCH_HAS_BROKEN_DWARF5
243 def_bool y
244 depends on RISCV_USE_LINKER_RELAXATION
245 # https://github.com/llvm/llvm-project/commit/1df5ea29b43690b6622db2cad7b745607ca4de6a
246 depends on AS_IS_LLVM && AS_VERSION < 180000
247 # https://github.com/llvm/llvm-project/commit/7ffabb61a5569444b5ac9322e22e5471cc5e4a77
248 depends on LD_IS_LLD && LLD_VERSION < 180000
250 config ARCH_MMAP_RND_BITS_MIN
251 default 18 if 64BIT
252 default 8
254 config ARCH_MMAP_RND_COMPAT_BITS_MIN
255 default 8
257 # max bits determined by the following formula:
258 # VA_BITS - PAGE_SHIFT - 3
259 config ARCH_MMAP_RND_BITS_MAX
260 default 24 if 64BIT # SV39 based
261 default 17
263 config ARCH_MMAP_RND_COMPAT_BITS_MAX
264 default 17
266 # set if we run in machine mode, cleared if we run in supervisor mode
267 config RISCV_M_MODE
268 bool "Build a kernel that runs in machine mode"
269 depends on !MMU
270 default y
271 help
272 Select this option if you want to run the kernel in M-mode,
273 without the assistance of any other firmware.
275 # set if we are running in S-mode and can use SBI calls
276 config RISCV_SBI
277 bool
278 depends on !RISCV_M_MODE
279 default y
281 config MMU
282 bool "MMU-based Paged Memory Management Support"
283 default y
284 help
285 Select if you want MMU-based virtualised addressing space
286 support by paged memory management. If unsure, say 'Y'.
288 config PAGE_OFFSET
289 hex
290 default 0x80000000 if !MMU && RISCV_M_MODE
291 default 0x80200000 if !MMU
292 default 0xc0000000 if 32BIT
293 default 0xff60000000000000 if 64BIT
295 config KASAN_SHADOW_OFFSET
296 hex
297 depends on KASAN_GENERIC
298 default 0xdfffffff00000000 if 64BIT
299 default 0xffffffff if 32BIT
301 config ARCH_FLATMEM_ENABLE
302 def_bool !NUMA
304 config ARCH_SPARSEMEM_ENABLE
305 def_bool y
306 depends on MMU
307 select SPARSEMEM_STATIC if 32BIT && SPARSEMEM
308 select SPARSEMEM_VMEMMAP_ENABLE if 64BIT
310 config ARCH_SELECT_MEMORY_MODEL
311 def_bool ARCH_SPARSEMEM_ENABLE
313 config ARCH_SUPPORTS_UPROBES
314 def_bool y
316 config STACKTRACE_SUPPORT
317 def_bool y
319 config GENERIC_BUG
320 def_bool y
321 depends on BUG
322 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
324 config GENERIC_BUG_RELATIVE_POINTERS
325 bool
327 config GENERIC_CALIBRATE_DELAY
328 def_bool y
330 config GENERIC_CSUM
331 def_bool y
333 config GENERIC_HWEIGHT
334 def_bool y
336 config FIX_EARLYCON_MEM
337 def_bool MMU
339 config ILLEGAL_POINTER_VALUE
340 hex
341 default 0 if 32BIT
342 default 0xdead000000000000 if 64BIT
344 config PGTABLE_LEVELS
345 int
346 default 5 if 64BIT
347 default 2
349 config LOCKDEP_SUPPORT
350 def_bool y
352 config RISCV_DMA_NONCOHERENT
353 bool
354 select ARCH_HAS_DMA_PREP_COHERENT
355 select ARCH_HAS_SETUP_DMA_OPS
356 select ARCH_HAS_SYNC_DMA_FOR_CPU
357 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
358 select DMA_BOUNCE_UNALIGNED_KMALLOC if SWIOTLB
360 config RISCV_NONSTANDARD_CACHE_OPS
361 bool
362 help
363 This enables function pointer support for non-standard noncoherent
364 systems to handle cache management.
366 config AS_HAS_INSN
367 def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)
369 config AS_HAS_OPTION_ARCH
370 # https://github.com/llvm/llvm-project/commit/9e8ed3403c191ab9c4903e8eeb8f732ff8a43cb4
371 def_bool y
372 depends on $(as-instr, .option arch$(comma) +m)
374 source "arch/riscv/Kconfig.socs"
375 source "arch/riscv/Kconfig.errata"
377 menu "Platform type"
379 config NONPORTABLE
380 bool "Allow configurations that result in non-portable kernels"
381 help
382 RISC-V kernel binaries are compatible between all known systems
383 whenever possible, but there are some use cases that can only be
384 satisfied by configurations that result in kernel binaries that are
385 not portable between systems.
387 Selecting N does not guarantee kernels will be portable to all known
388 systems. Selecting any of the options guarded by NONPORTABLE will
389 result in kernel binaries that are unlikely to be portable between
390 systems.
392 If unsure, say N.
394 choice
395 prompt "Base ISA"
396 default ARCH_RV64I
397 help
398 This selects the base ISA that this kernel will target and must match
399 the target platform.
401 config ARCH_RV32I
402 bool "RV32I"
403 depends on NONPORTABLE
404 select 32BIT
405 select GENERIC_LIB_ASHLDI3
406 select GENERIC_LIB_ASHRDI3
407 select GENERIC_LIB_LSHRDI3
408 select GENERIC_LIB_UCMPDI2
410 config ARCH_RV64I
411 bool "RV64I"
412 select 64BIT
413 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
414 select SWIOTLB if MMU
416 endchoice
418 # We must be able to map all physical memory into the kernel, but the compiler
419 # is still a bit more efficient when generating code if it's setup in a manner
420 # such that it can only map 2GiB of memory.
421 choice
422 prompt "Kernel Code Model"
423 default CMODEL_MEDLOW if 32BIT
424 default CMODEL_MEDANY if 64BIT
426 config CMODEL_MEDLOW
427 bool "medium low code model"
428 config CMODEL_MEDANY
429 bool "medium any code model"
430 endchoice
432 config MODULE_SECTIONS
433 bool
434 select HAVE_MOD_ARCH_SPECIFIC
436 config SMP
437 bool "Symmetric Multi-Processing"
438 help
439 This enables support for systems with more than one CPU. If
440 you say N here, the kernel will run on single and
441 multiprocessor machines, but will use only one CPU of a
442 multiprocessor machine. If you say Y here, the kernel will run
443 on many, but not all, single processor machines. On a single
444 processor machine, the kernel will run faster if you say N
445 here.
447 If you don't know what to do here, say N.
449 config SCHED_MC
450 bool "Multi-core scheduler support"
451 depends on SMP
452 help
453 Multi-core scheduler support improves the CPU scheduler's decision
454 making when dealing with multi-core CPU chips at a cost of slightly
455 increased overhead in some places. If unsure say N here.
457 config NR_CPUS
458 int "Maximum number of CPUs (2-512)"
459 depends on SMP
460 range 2 512 if !RISCV_SBI_V01
461 range 2 32 if RISCV_SBI_V01 && 32BIT
462 range 2 64 if RISCV_SBI_V01 && 64BIT
463 default "32" if 32BIT
464 default "64" if 64BIT
466 config HOTPLUG_CPU
467 bool "Support for hot-pluggable CPUs"
468 depends on SMP
469 select GENERIC_IRQ_MIGRATION
470 help
472 Say Y here to experiment with turning CPUs off and on. CPUs
473 can be controlled through /sys/devices/system/cpu.
475 Say N if you want to disable CPU hotplug.
477 choice
478 prompt "CPU Tuning"
479 default TUNE_GENERIC
481 config TUNE_GENERIC
482 bool "generic"
484 endchoice
486 # Common NUMA Features
487 config NUMA
488 bool "NUMA Memory Allocation and Scheduler Support"
489 depends on SMP && MMU
490 select ARCH_SUPPORTS_NUMA_BALANCING
491 select GENERIC_ARCH_NUMA
492 select HAVE_SETUP_PER_CPU_AREA
493 select NEED_PER_CPU_EMBED_FIRST_CHUNK
494 select NEED_PER_CPU_PAGE_FIRST_CHUNK
495 select OF_NUMA
496 select USE_PERCPU_NUMA_NODE_ID
497 help
498 Enable NUMA (Non-Uniform Memory Access) support.
500 The kernel will try to allocate memory used by a CPU on the
501 local memory of the CPU and add some more NUMA awareness to the kernel.
503 config NODES_SHIFT
504 int "Maximum NUMA Nodes (as a power of 2)"
505 range 1 10
506 default "2"
507 depends on NUMA
508 help
509 Specify the maximum number of NUMA Nodes available on the target
510 system. Increases memory reserved to accommodate various tables.
512 choice
513 prompt "RISC-V spinlock type"
514 default RISCV_COMBO_SPINLOCKS
516 config RISCV_TICKET_SPINLOCKS
517 bool "Using ticket spinlock"
519 config RISCV_QUEUED_SPINLOCKS
520 bool "Using queued spinlock"
521 depends on SMP && MMU && NONPORTABLE
522 select ARCH_USE_QUEUED_SPINLOCKS
523 help
524 The queued spinlock implementation requires the forward progress
525 guarantee of cmpxchg()/xchg() atomic operations: CAS with Zabha or
526 LR/SC with Ziccrse provide such guarantee.
528 Select this if and only if Zabha or Ziccrse is available on your
529 platform, RISCV_QUEUED_SPINLOCKS must not be selected for platforms
530 without one of those extensions.
532 If unsure, select RISCV_COMBO_SPINLOCKS, which will use qspinlocks
533 when supported and otherwise ticket spinlocks.
535 config RISCV_COMBO_SPINLOCKS
536 bool "Using combo spinlock"
537 depends on SMP && MMU
538 select ARCH_USE_QUEUED_SPINLOCKS
539 help
540 Embed both queued spinlock and ticket lock so that the spinlock
541 implementation can be chosen at runtime.
543 endchoice
545 config RISCV_ALTERNATIVE
546 bool
547 depends on !XIP_KERNEL
548 help
549 This Kconfig allows the kernel to automatically patch the
550 erratum or cpufeature required by the execution platform at run
551 time. The code patching overhead is minimal, as it's only done
552 once at boot and once on each module load.
554 config RISCV_ALTERNATIVE_EARLY
555 bool
556 depends on RISCV_ALTERNATIVE
557 help
558 Allows early patching of the kernel for special errata
560 config RISCV_ISA_C
561 bool "Emit compressed instructions when building Linux"
562 default y
563 help
564 Adds "C" to the ISA subsets that the toolchain is allowed to emit
565 when building Linux, which results in compressed instructions in the
566 Linux binary.
568 If you don't know what to do here, say Y.
570 config RISCV_ISA_SUPM
571 bool "Supm extension for userspace pointer masking"
572 depends on 64BIT
573 default y
574 help
575 Add support for pointer masking in userspace (Supm) when the
576 underlying hardware extension (Smnpm or Ssnpm) is detected at boot.
578 If this option is disabled, userspace will be unable to use
579 the prctl(PR_{SET,GET}_TAGGED_ADDR_CTRL) API.
581 config RISCV_ISA_SVNAPOT
582 bool "Svnapot extension support for supervisor mode NAPOT pages"
583 depends on 64BIT && MMU
584 depends on RISCV_ALTERNATIVE
585 default y
586 help
587 Allow kernel to detect the Svnapot ISA-extension dynamically at boot
588 time and enable its usage.
590 The Svnapot extension is used to mark contiguous PTEs as a range
591 of contiguous virtual-to-physical translations for a naturally
592 aligned power-of-2 (NAPOT) granularity larger than the base 4KB page
593 size. When HUGETLBFS is also selected this option unconditionally
594 allocates some memory for each NAPOT page size supported by the kernel.
595 When optimizing for low memory consumption and for platforms without
596 the Svnapot extension, it may be better to say N here.
598 If you don't know what to do here, say Y.
600 config RISCV_ISA_SVPBMT
601 bool "Svpbmt extension support for supervisor mode page-based memory types"
602 depends on 64BIT && MMU
603 depends on RISCV_ALTERNATIVE
604 default y
605 help
606 Adds support to dynamically detect the presence of the Svpbmt
607 ISA-extension (Supervisor-mode: page-based memory types) and
608 enable its usage.
610 The memory type for a page contains a combination of attributes
611 that indicate the cacheability, idempotency, and ordering
612 properties for access to that page.
614 The Svpbmt extension is only available on 64-bit cpus.
616 If you don't know what to do here, say Y.
618 config TOOLCHAIN_HAS_V
619 bool
620 default y
621 depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64imv)
622 depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32imv)
623 depends on LLD_VERSION >= 140000 || LD_VERSION >= 23800
624 depends on AS_HAS_OPTION_ARCH
626 config RISCV_ISA_V
627 bool "VECTOR extension support"
628 depends on TOOLCHAIN_HAS_V
629 depends on FPU
630 select DYNAMIC_SIGFRAME
631 default y
632 help
633 Say N here if you want to disable all vector related procedure
634 in the kernel.
636 If you don't know what to do here, say Y.
638 config RISCV_ISA_V_DEFAULT_ENABLE
639 bool "Enable userspace Vector by default"
640 depends on RISCV_ISA_V
641 default y
642 help
643 Say Y here if you want to enable Vector in userspace by default.
644 Otherwise, userspace has to make explicit prctl() call to enable
645 Vector, or enable it via the sysctl interface.
647 If you don't know what to do here, say Y.
649 config RISCV_ISA_V_UCOPY_THRESHOLD
650 int "Threshold size for vectorized user copies"
651 depends on RISCV_ISA_V
652 default 768
653 help
654 Prefer using vectorized copy_to_user()/copy_from_user() when the
655 workload size exceeds this value.
657 config RISCV_ISA_V_PREEMPTIVE
658 bool "Run kernel-mode Vector with kernel preemption"
659 depends on PREEMPTION
660 depends on RISCV_ISA_V
661 default y
662 help
663 Usually, in-kernel SIMD routines are run with preemption disabled.
664 Functions which envoke long running SIMD thus must yield core's
665 vector unit to prevent blocking other tasks for too long.
667 This config allows kernel to run SIMD without explicitly disable
668 preemption. Enabling this config will result in higher memory
669 consumption due to the allocation of per-task's kernel Vector context.
671 config RISCV_ISA_ZAWRS
672 bool "Zawrs extension support for more efficient busy waiting"
673 depends on RISCV_ALTERNATIVE
674 default y
675 help
676 The Zawrs extension defines instructions to be used in polling loops
677 which allow a hart to enter a low-power state or to trap to the
678 hypervisor while waiting on a store to a memory location. Enable the
679 use of these instructions in the kernel when the Zawrs extension is
680 detected at boot.
682 config TOOLCHAIN_HAS_ZABHA
683 bool
684 default y
685 depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zabha)
686 depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zabha)
687 depends on AS_HAS_OPTION_ARCH
689 config RISCV_ISA_ZABHA
690 bool "Zabha extension support for atomic byte/halfword operations"
691 depends on TOOLCHAIN_HAS_ZABHA
692 depends on RISCV_ALTERNATIVE
693 default y
694 help
695 Enable the use of the Zabha ISA-extension to implement kernel
696 byte/halfword atomic memory operations when it is detected at boot.
698 If you don't know what to do here, say Y.
700 config TOOLCHAIN_HAS_ZACAS
701 bool
702 default y
703 depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zacas)
704 depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zacas)
705 depends on AS_HAS_OPTION_ARCH
707 config RISCV_ISA_ZACAS
708 bool "Zacas extension support for atomic CAS"
709 depends on TOOLCHAIN_HAS_ZACAS
710 depends on RISCV_ALTERNATIVE
711 default y
712 help
713 Enable the use of the Zacas ISA-extension to implement kernel atomic
714 cmpxchg operations when it is detected at boot.
716 If you don't know what to do here, say Y.
718 config TOOLCHAIN_HAS_ZBB
719 bool
720 default y
721 depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbb)
722 depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbb)
723 depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
724 depends on AS_HAS_OPTION_ARCH
726 # This symbol indicates that the toolchain supports all v1.0 vector crypto
727 # extensions, including Zvk*, Zvbb, and Zvbc. LLVM added all of these at once.
728 # binutils added all except Zvkb, then added Zvkb. So we just check for Zvkb.
729 config TOOLCHAIN_HAS_VECTOR_CRYPTO
730 def_bool $(as-instr, .option arch$(comma) +v$(comma) +zvkb)
731 depends on AS_HAS_OPTION_ARCH
733 config RISCV_ISA_ZBA
734 bool "Zba extension support for bit manipulation instructions"
735 default y
736 help
737 Add support for enabling optimisations in the kernel when the Zba
738 extension is detected at boot.
740 The Zba extension provides instructions to accelerate the generation
741 of addresses that index into arrays of basic data types.
743 If you don't know what to do here, say Y.
745 config RISCV_ISA_ZBB
746 bool "Zbb extension support for bit manipulation instructions"
747 depends on TOOLCHAIN_HAS_ZBB
748 depends on RISCV_ALTERNATIVE
749 default y
750 help
751 Adds support to dynamically detect the presence of the ZBB
752 extension (basic bit manipulation) and enable its usage.
754 The Zbb extension provides instructions to accelerate a number
755 of bit-specific operations (count bit population, sign extending,
756 bitrotation, etc).
758 If you don't know what to do here, say Y.
760 config TOOLCHAIN_HAS_ZBC
761 bool
762 default y
763 depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbc)
764 depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbc)
765 depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
766 depends on AS_HAS_OPTION_ARCH
768 config RISCV_ISA_ZBC
769 bool "Zbc extension support for carry-less multiplication instructions"
770 depends on TOOLCHAIN_HAS_ZBC
771 depends on MMU
772 depends on RISCV_ALTERNATIVE
773 default y
774 help
775 Adds support to dynamically detect the presence of the Zbc
776 extension (carry-less multiplication) and enable its usage.
778 The Zbc extension could accelerate CRC (cyclic redundancy check)
779 calculations.
781 If you don't know what to do here, say Y.
783 config RISCV_ISA_ZICBOM
784 bool "Zicbom extension support for non-coherent DMA operation"
785 depends on MMU
786 depends on RISCV_ALTERNATIVE
787 default y
788 select RISCV_DMA_NONCOHERENT
789 select DMA_DIRECT_REMAP
790 help
791 Adds support to dynamically detect the presence of the ZICBOM
792 extension (Cache Block Management Operations) and enable its
793 usage.
795 The Zicbom extension can be used to handle for example
796 non-coherent DMA support on devices that need it.
798 If you don't know what to do here, say Y.
800 config RISCV_ISA_ZICBOZ
801 bool "Zicboz extension support for faster zeroing of memory"
802 depends on RISCV_ALTERNATIVE
803 default y
804 help
805 Enable the use of the Zicboz extension (cbo.zero instruction)
806 when available.
808 The Zicboz extension is used for faster zeroing of memory.
810 If you don't know what to do here, say Y.
812 config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
813 def_bool y
814 # https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6dc
815 # https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=98416dbb0a62579d4a7a4a76bab51b5b52fec2cd
816 depends on AS_IS_GNU && AS_VERSION >= 23600
817 help
818 Binutils-2.38 and GCC-12.1.0 bumped the default ISA spec to the newer
819 20191213 version, which moves some instructions from the I extension to
820 the Zicsr and Zifencei extensions. This requires explicitly specifying
821 Zicsr and Zifencei when binutils >= 2.38 or GCC >= 12.1.0. Zicsr
822 and Zifencei are supported in binutils from version 2.36 onwards.
823 To make life easier, and avoid forcing toolchains that default to a
824 newer ISA spec to version 2.2, relax the check to binutils >= 2.36.
825 For clang < 17 or GCC < 11.3.0, for which this is not possible or need
826 special treatment, this is dealt with in TOOLCHAIN_NEEDS_OLD_ISA_SPEC.
828 config TOOLCHAIN_NEEDS_OLD_ISA_SPEC
829 def_bool y
830 depends on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
831 # https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
832 # https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=d29f5d6ab513c52fd872f532c492e35ae9fd6671
833 depends on (CC_IS_CLANG && CLANG_VERSION < 170000) || (CC_IS_GCC && GCC_VERSION < 110300)
834 help
835 Certain versions of clang and GCC do not support zicsr and zifencei via
836 -march. This option causes an older ISA spec compatible with these older
837 versions of clang and GCC to be passed to GAS, which has the same result
838 as passing zicsr and zifencei to -march.
840 config FPU
841 bool "FPU support"
842 default y
843 help
844 Say N here if you want to disable all floating-point related procedure
845 in the kernel.
847 If you don't know what to do here, say Y.
849 config IRQ_STACKS
850 bool "Independent irq & softirq stacks" if EXPERT
851 default y
852 select HAVE_IRQ_EXIT_ON_IRQ_STACK
853 select HAVE_SOFTIRQ_ON_OWN_STACK
854 help
855 Add independent irq & softirq stacks for percpu to prevent kernel stack
856 overflows. We may save some memory footprint by disabling IRQ_STACKS.
858 config THREAD_SIZE_ORDER
859 int "Kernel stack size (in power-of-two numbers of page size)" if VMAP_STACK && EXPERT
860 range 0 4
861 default 1 if 32BIT
862 default 2
863 help
864 Specify the Pages of thread stack size (from 4KB to 64KB), which also
865 affects irq stack size, which is equal to thread stack size.
867 config RISCV_MISALIGNED
868 bool
869 help
870 Embed support for detecting and emulating misaligned
871 scalar or vector loads and stores.
873 config RISCV_SCALAR_MISALIGNED
874 bool
875 select RISCV_MISALIGNED
876 select SYSCTL_ARCH_UNALIGN_ALLOW
877 help
878 Embed support for emulating misaligned loads and stores.
880 config RISCV_VECTOR_MISALIGNED
881 bool
882 select RISCV_MISALIGNED
883 depends on RISCV_ISA_V
884 help
885 Enable detecting support for vector misaligned loads and stores.
887 choice
888 prompt "Unaligned Accesses Support"
889 default RISCV_PROBE_UNALIGNED_ACCESS
890 help
891 This determines the level of support for unaligned accesses. This
892 information is used by the kernel to perform optimizations. It is also
893 exposed to user space via the hwprobe syscall. The hardware will be
894 probed at boot by default.
896 config RISCV_PROBE_UNALIGNED_ACCESS
897 bool "Probe for hardware unaligned access support"
898 select RISCV_SCALAR_MISALIGNED
899 help
900 During boot, the kernel will run a series of tests to determine the
901 speed of unaligned accesses. This probing will dynamically determine
902 the speed of unaligned accesses on the underlying system. If unaligned
903 memory accesses trap into the kernel as they are not supported by the
904 system, the kernel will emulate the unaligned accesses to preserve the
905 UABI.
907 config RISCV_EMULATED_UNALIGNED_ACCESS
908 bool "Emulate unaligned access where system support is missing"
909 select RISCV_SCALAR_MISALIGNED
910 help
911 If unaligned memory accesses trap into the kernel as they are not
912 supported by the system, the kernel will emulate the unaligned
913 accesses to preserve the UABI. When the underlying system does support
914 unaligned accesses, the unaligned accesses are assumed to be slow.
916 config RISCV_SLOW_UNALIGNED_ACCESS
917 bool "Assume the system supports slow unaligned memory accesses"
918 depends on NONPORTABLE
919 help
920 Assume that the system supports slow unaligned memory accesses. The
921 kernel and userspace programs may not be able to run at all on systems
922 that do not support unaligned memory accesses.
924 config RISCV_EFFICIENT_UNALIGNED_ACCESS
925 bool "Assume the system supports fast unaligned memory accesses"
926 depends on NONPORTABLE
927 select DCACHE_WORD_ACCESS if MMU
928 select HAVE_EFFICIENT_UNALIGNED_ACCESS
929 help
930 Assume that the system supports fast unaligned memory accesses. When
931 enabled, this option improves the performance of the kernel on such
932 systems. However, the kernel and userspace programs will run much more
933 slowly, or will not be able to run at all, on systems that do not
934 support efficient unaligned memory accesses.
936 endchoice
938 choice
939 prompt "Vector unaligned Accesses Support"
940 depends on RISCV_ISA_V
941 default RISCV_PROBE_VECTOR_UNALIGNED_ACCESS
942 help
943 This determines the level of support for vector unaligned accesses. This
944 information is used by the kernel to perform optimizations. It is also
945 exposed to user space via the hwprobe syscall. The hardware will be
946 probed at boot by default.
948 config RISCV_PROBE_VECTOR_UNALIGNED_ACCESS
949 bool "Probe speed of vector unaligned accesses"
950 select RISCV_VECTOR_MISALIGNED
951 depends on RISCV_ISA_V
952 help
953 During boot, the kernel will run a series of tests to determine the
954 speed of vector unaligned accesses if they are supported. This probing
955 will dynamically determine the speed of vector unaligned accesses on
956 the underlying system if they are supported.
958 config RISCV_SLOW_VECTOR_UNALIGNED_ACCESS
959 bool "Assume the system supports slow vector unaligned memory accesses"
960 depends on NONPORTABLE
961 help
962 Assume that the system supports slow vector unaligned memory accesses. The
963 kernel and userspace programs may not be able to run at all on systems
964 that do not support unaligned memory accesses.
966 config RISCV_EFFICIENT_VECTOR_UNALIGNED_ACCESS
967 bool "Assume the system supports fast vector unaligned memory accesses"
968 depends on NONPORTABLE
969 help
970 Assume that the system supports fast vector unaligned memory accesses. When
971 enabled, this option improves the performance of the kernel on such
972 systems. However, the kernel and userspace programs will run much more
973 slowly, or will not be able to run at all, on systems that do not
974 support efficient unaligned memory accesses.
976 endchoice
978 source "arch/riscv/Kconfig.vendor"
980 endmenu # "Platform type"
982 menu "Kernel features"
984 source "kernel/Kconfig.hz"
986 config RISCV_SBI_V01
987 bool "SBI v0.1 support"
988 depends on RISCV_SBI
989 help
990 This config allows kernel to use SBI v0.1 APIs. This will be
991 deprecated in future once legacy M-mode software are no longer in use.
993 config RISCV_BOOT_SPINWAIT
994 bool "Spinwait booting method"
995 depends on SMP
996 default y if RISCV_SBI_V01 || RISCV_M_MODE
997 help
998 This enables support for booting Linux via spinwait method. In the
999 spinwait method, all cores randomly jump to Linux. One of the cores
1000 gets chosen via lottery and all other keep spinning on a percpu
1001 variable. This method cannot support CPU hotplug and sparse hartid
1002 scheme. It should be only enabled for M-mode Linux or platforms relying
1003 on older firmware without SBI HSM extension. All other platforms should
1004 rely on ordered booting via SBI HSM extension which gets chosen
1005 dynamically at runtime if the firmware supports it.
1007 Since spinwait is incompatible with sparse hart IDs, it requires
1008 NR_CPUS be large enough to contain the physical hart ID of the first
1009 hart to enter Linux.
1011 If unsure what to do here, say N.
1013 config ARCH_SUPPORTS_KEXEC
1014 def_bool y
1016 config ARCH_SELECTS_KEXEC
1017 def_bool y
1018 depends on KEXEC
1019 select HOTPLUG_CPU if SMP
1021 config ARCH_SUPPORTS_KEXEC_FILE
1022 def_bool 64BIT
1024 config ARCH_SELECTS_KEXEC_FILE
1025 def_bool y
1026 depends on KEXEC_FILE
1027 select HAVE_IMA_KEXEC if IMA
1028 select KEXEC_ELF
1030 config ARCH_SUPPORTS_KEXEC_PURGATORY
1031 def_bool ARCH_SUPPORTS_KEXEC_FILE
1033 config ARCH_SUPPORTS_CRASH_DUMP
1034 def_bool y
1036 config ARCH_DEFAULT_CRASH_DUMP
1037 def_bool y
1039 config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
1040 def_bool CRASH_RESERVE
1042 config COMPAT
1043 bool "Kernel support for 32-bit U-mode"
1044 default 64BIT
1045 depends on 64BIT && MMU
1046 help
1047 This option enables support for a 32-bit U-mode running under a 64-bit
1048 kernel at S-mode. riscv32-specific components such as system calls,
1049 the user helper functions (vdso), signal rt_frame functions and the
1050 ptrace interface are handled appropriately by the kernel.
1052 If you want to execute 32-bit userspace applications, say Y.
1054 config PARAVIRT
1055 bool "Enable paravirtualization code"
1056 depends on RISCV_SBI
1057 help
1058 This changes the kernel so it can modify itself when it is run
1059 under a hypervisor, potentially improving performance significantly
1060 over full virtualization.
1062 config PARAVIRT_TIME_ACCOUNTING
1063 bool "Paravirtual steal time accounting"
1064 depends on PARAVIRT
1065 help
1066 Select this option to enable fine granularity task steal time
1067 accounting. Time spent executing other tasks in parallel with
1068 the current vCPU is discounted from the vCPU power. To account for
1069 that, there can be a small performance impact.
1071 If in doubt, say N here.
1073 config RELOCATABLE
1074 bool "Build a relocatable kernel"
1075 depends on MMU && 64BIT && !XIP_KERNEL
1076 select MODULE_SECTIONS if MODULES
1077 help
1078 This builds a kernel as a Position Independent Executable (PIE),
1079 which retains all relocation metadata required to relocate the
1080 kernel binary at runtime to a different virtual address than the
1081 address it was linked at.
1082 Since RISCV uses the RELA relocation format, this requires a
1083 relocation pass at runtime even if the kernel is loaded at the
1084 same address it was linked at.
1086 If unsure, say N.
1088 config RANDOMIZE_BASE
1089 bool "Randomize the address of the kernel image"
1090 select RELOCATABLE
1091 depends on MMU && 64BIT && !XIP_KERNEL
1092 help
1093 Randomizes the virtual address at which the kernel image is
1094 loaded, as a security feature that deters exploit attempts
1095 relying on knowledge of the location of kernel internals.
1097 It is the bootloader's job to provide entropy, by passing a
1098 random u64 value in /chosen/kaslr-seed at kernel entry.
1100 When booting via the UEFI stub, it will invoke the firmware's
1101 EFI_RNG_PROTOCOL implementation (if available) to supply entropy
1102 to the kernel proper. In addition, it will randomise the physical
1103 location of the kernel Image as well.
1105 If unsure, say N.
1107 endmenu # "Kernel features"
1109 menu "Boot options"
1111 config CMDLINE
1112 string "Built-in kernel command line"
1113 help
1114 For most platforms, the arguments for the kernel's command line
1115 are provided at run-time, during boot. However, there are cases
1116 where either no arguments are being provided or the provided
1117 arguments are insufficient or even invalid.
1119 When that occurs, it is possible to define a built-in command
1120 line here and choose how the kernel should use it later on.
1122 choice
1123 prompt "Built-in command line usage"
1124 depends on CMDLINE != ""
1125 default CMDLINE_FALLBACK
1126 help
1127 Choose how the kernel will handle the provided built-in command
1128 line.
1130 config CMDLINE_FALLBACK
1131 bool "Use bootloader kernel arguments if available"
1132 help
1133 Use the built-in command line as fallback in case we get nothing
1134 during boot. This is the default behaviour.
1136 config CMDLINE_EXTEND
1137 bool "Extend bootloader kernel arguments"
1138 help
1139 The command-line arguments provided during boot will be
1140 appended to the built-in command line. This is useful in
1141 cases where the provided arguments are insufficient and
1142 you don't want to or cannot modify them.
1144 config CMDLINE_FORCE
1145 bool "Always use the default kernel command string"
1146 help
1147 Always use the built-in command line, even if we get one during
1148 boot. This is useful in case you need to override the provided
1149 command line on systems where you don't have or want control
1150 over it.
1152 endchoice
1154 config EFI_STUB
1155 bool
1157 config EFI
1158 bool "UEFI runtime support"
1159 depends on OF && !XIP_KERNEL
1160 depends on MMU
1161 default y
1162 select ARCH_SUPPORTS_ACPI if 64BIT
1163 select EFI_GENERIC_STUB
1164 select EFI_PARAMS_FROM_FDT
1165 select EFI_RUNTIME_WRAPPERS
1166 select EFI_STUB
1167 select LIBFDT
1168 select RISCV_ISA_C
1169 select UCS2_STRING
1170 help
1171 This option provides support for runtime services provided
1172 by UEFI firmware (such as non-volatile variables, realtime
1173 clock, and platform reset). A UEFI stub is also provided to
1174 allow the kernel to be booted as an EFI application. This
1175 is only useful on systems that have UEFI firmware.
1177 config DMI
1178 bool "Enable support for SMBIOS (DMI) tables"
1179 depends on EFI
1180 default y
1181 help
1182 This enables SMBIOS/DMI feature for systems.
1184 This option is only useful on systems that have UEFI firmware.
1185 However, even with this option, the resultant kernel should
1186 continue to boot on existing non-UEFI platforms.
1188 config CC_HAVE_STACKPROTECTOR_TLS
1189 def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0)
1191 config STACKPROTECTOR_PER_TASK
1192 def_bool y
1193 depends on !RANDSTRUCT
1194 depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
1196 config PHYS_RAM_BASE_FIXED
1197 bool "Explicitly specified physical RAM address"
1198 depends on NONPORTABLE
1199 default n
1201 config PHYS_RAM_BASE
1202 hex "Platform Physical RAM address"
1203 depends on PHYS_RAM_BASE_FIXED
1204 default "0x80000000"
1205 help
1206 This is the physical address of RAM in the system. It has to be
1207 explicitly specified to run early relocations of read-write data
1208 from flash to RAM.
1210 config XIP_KERNEL
1211 bool "Kernel Execute-In-Place from ROM"
1212 depends on MMU && SPARSEMEM && NONPORTABLE
1213 # This prevents XIP from being enabled by all{yes,mod}config, which
1214 # fail to build since XIP doesn't support large kernels.
1215 depends on !COMPILE_TEST
1216 select PHYS_RAM_BASE_FIXED
1217 help
1218 Execute-In-Place allows the kernel to run from non-volatile storage
1219 directly addressable by the CPU, such as NOR flash. This saves RAM
1220 space since the text section of the kernel is not loaded from flash
1221 to RAM. Read-write sections, such as the data section and stack,
1222 are still copied to RAM. The XIP kernel is not compressed since
1223 it has to run directly from flash, so it will take more space to
1224 store it. The flash address used to link the kernel object files,
1225 and for storing it, is configuration dependent. Therefore, if you
1226 say Y here, you must know the proper physical address where to
1227 store the kernel image depending on your own flash memory usage.
1229 Also note that the make target becomes "make xipImage" rather than
1230 "make zImage" or "make Image". The final kernel binary to put in
1231 ROM memory will be arch/riscv/boot/xipImage.
1233 SPARSEMEM is required because the kernel text and rodata that are
1234 flash resident are not backed by memmap, then any attempt to get
1235 a struct page on those regions will trigger a fault.
1237 If unsure, say N.
1239 config XIP_PHYS_ADDR
1240 hex "XIP Kernel Physical Location"
1241 depends on XIP_KERNEL
1242 default "0x21000000"
1243 help
1244 This is the physical address in your flash memory the kernel will
1245 be linked for and stored to. This address is dependent on your
1246 own flash usage.
1248 config RISCV_ISA_FALLBACK
1249 bool "Permit falling back to parsing riscv,isa for extension support by default"
1250 default y
1251 help
1252 Parsing the "riscv,isa" devicetree property has been deprecated and
1253 replaced by a list of explicitly defined strings. For compatibility
1254 with existing platforms, the kernel will fall back to parsing the
1255 "riscv,isa" property if the replacements are not found.
1257 Selecting N here will result in a kernel that does not use the
1258 fallback, unless the commandline "riscv_isa_fallback" parameter is
1259 present.
1261 Please see the dt-binding, located at
1262 Documentation/devicetree/bindings/riscv/extensions.yaml for details
1263 on the replacement properties, "riscv,isa-base" and
1264 "riscv,isa-extensions".
1266 config BUILTIN_DTB
1267 bool "Built-in device tree"
1268 depends on OF && NONPORTABLE
1269 help
1270 Build a device tree into the Linux image.
1271 This option should be selected if no bootloader is being used.
1272 If unsure, say N.
1275 config BUILTIN_DTB_SOURCE
1276 string "Built-in device tree source"
1277 depends on BUILTIN_DTB
1278 help
1279 DTS file path (without suffix, relative to arch/riscv/boot/dts)
1280 for the DTS file that will be used to produce the DTB linked into the
1281 kernel.
1283 endmenu # "Boot options"
1285 config PORTABLE
1286 bool
1287 default !NONPORTABLE
1288 select EFI
1289 select MMU
1290 select OF
1292 config ARCH_PROC_KCORE_TEXT
1293 def_bool y
1295 menu "Power management options"
1297 source "kernel/power/Kconfig"
1299 config ARCH_HIBERNATION_POSSIBLE
1300 def_bool y
1302 config ARCH_HIBERNATION_HEADER
1303 def_bool HIBERNATION
1305 config ARCH_SUSPEND_POSSIBLE
1306 def_bool y
1308 endmenu # "Power management options"
1310 menu "CPU Power Management"
1312 source "drivers/cpuidle/Kconfig"
1314 source "drivers/cpufreq/Kconfig"
1316 endmenu # "CPU Power Management"
1318 source "arch/riscv/kvm/Kconfig"
1320 source "drivers/acpi/Kconfig"