1 # SPDX-License-Identifier: GPL-2.0-only
2 #
3 # For a description of the syntax of this conf
4 # see Documentation/kbuild/kconfig-language.rs
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 A
19 select ACPI_SPCR_TABLE if ACPI
20 select ARCH_DMA_DEFAULT_COHERENT
21 select ARCH_ENABLE_HUGEPAGE_MIGRATION
22 select ARCH_ENABLE_MEMORY_HOTPLUG if S
23 select ARCH_ENABLE_MEMORY_HOTREMOVE if
24 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if
25 select ARCH_ENABLE_THP_MIGRATION if TR
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
37 select ARCH_HAS_MEMBARRIER_CALLBACKS
38 select ARCH_HAS_MEMBARRIER_SYNC_CORE
39 select ARCH_HAS_MMIOWB
40 select ARCH_HAS_NON_OVERLAPPING_ADDRES
41 select ARCH_HAS_PMEM_API
42 select ARCH_HAS_PREPARE_SYNC_CORE_CMD
43 select ARCH_HAS_PTE_DEVMAP if 64BIT &&
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 M
48 select ARCH_HAS_STRICT_MODULE_RWX if M
49 select ARCH_HAS_SYNC_CORE_BEFORE_USERM
50 select ARCH_HAS_SYSCALL_WRAPPER
51 select ARCH_HAS_TICK_BROADCAST if GENE
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_ENABL
56 select ARCH_OPTIONAL_KERNEL_RWX if ARC
57 select ARCH_OPTIONAL_KERNEL_RWX_DEFAUL
58 select ARCH_STACKWALK
59 select ARCH_SUPPORTS_ATOMIC_RMW
60 select ARCH_SUPPORTS_CFI_CLANG
61 select ARCH_SUPPORTS_DEBUG_PAGEALLOC i
62 select ARCH_SUPPORTS_HUGETLBFS if MMU
63 # LLD >= 14: https://github.com/llvm/l
64 select ARCH_SUPPORTS_LTO_CLANG if LLD_
65 select ARCH_SUPPORTS_LTO_CLANG_THIN if
66 select ARCH_SUPPORTS_PAGE_TABLE_CHECK
67 select ARCH_SUPPORTS_PER_VMA_LOCK if M
68 select ARCH_SUPPORTS_RT
69 select ARCH_SUPPORTS_SHADOW_CALL_STACK
70 select ARCH_USE_CMPXCHG_LOCKREF if 64B
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_CLAN
75 select ARCH_WANT_BATCHED_UNMAP_TLB_FLU
76 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_
77 select ARCH_WANT_FRAME_POINTERS
78 select ARCH_WANT_GENERAL_HUGETLB if !R
79 select ARCH_WANT_HUGE_PMD_SHARE if 64B
80 select ARCH_WANT_LD_ORPHAN_WARN if !XI
81 select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP
82 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEM
83 select ARCH_WANTS_NO_INSTR
84 select ARCH_WANTS_THP_SWAP if HAVE_ARC
85 select BINFMT_FLAT_NO_DATA_START_OFFSE
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 || HIBERNATI
91 select EDAC_SUPPORT
92 select FRAME_POINTER if PERF_EVENTS ||
93 select FTRACE_MCOUNT_USE_PATCHABLE_FUN
94 select GENERIC_ARCH_TOPOLOGY
95 select GENERIC_ATOMIC64 if !64BIT
96 select GENERIC_CLOCKEVENTS_BROADCAST i
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_GE
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 &&
115 select GENERIC_VDSO_TIME_NS if HAVE_GE
116 select HARDIRQS_SW_RESEND
117 select HAS_IOPORT if MMU
118 select HAVE_ARCH_AUDITSYSCALL
119 select HAVE_ARCH_HUGE_VMALLOC if HAVE_
120 select HAVE_ARCH_HUGE_VMAP if MMU && 6
121 select HAVE_ARCH_JUMP_LABEL if !XIP_KE
122 select HAVE_ARCH_JUMP_LABEL_RELATIVE i
123 select HAVE_ARCH_KASAN if MMU && 64BIT
124 select HAVE_ARCH_KASAN_VMALLOC if MMU
125 select HAVE_ARCH_KFENCE if MMU && 64BI
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
130 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFS
131 select HAVE_ARCH_SECCOMP_FILTER
132 select HAVE_ARCH_STACKLEAK
133 select HAVE_ARCH_THREAD_STRUCT_WHITELI
134 select HAVE_ARCH_TRACEHOOK
135 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
136 select HAVE_ARCH_USERFAULTFD_MINOR if
137 select HAVE_ARCH_VMAP_STACK if MMU &&
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_KER
143 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT
144 select HAVE_DYNAMIC_FTRACE_WITH_ARGS i
145 select HAVE_FTRACE_MCOUNT_RECORD if !X
146 select HAVE_FUNCTION_GRAPH_TRACER
147 select HAVE_FUNCTION_GRAPH_RETVAL if H
148 select HAVE_FUNCTION_TRACER if !XIP_KE
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 && 64B
155 select HAVE_IRQ_TIME_ACCOUNTING
156 select HAVE_KERNEL_BZIP2 if !XIP_KERNE
157 select HAVE_KERNEL_GZIP if !XIP_KERNEL
158 select HAVE_KERNEL_LZ4 if !XIP_KERNEL
159 select HAVE_KERNEL_LZMA if !XIP_KERNEL
160 select HAVE_KERNEL_LZO if !XIP_KERNEL
161 select HAVE_KERNEL_UNCOMPRESSED if !XI
162 select HAVE_KERNEL_ZSTD if !XIP_KERNEL
163 select HAVE_KERNEL_XZ if !XIP_KERNEL &
164 select HAVE_KPROBES if !XIP_KERNEL
165 select HAVE_KRETPROBES if !XIP_KERNEL
166 # https://github.com/ClangBuiltLinux/l
167 select HAVE_LD_DEAD_CODE_DATA_ELIMINAT
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 !XI
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_RIS
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 HOTPL
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 SM
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_KERNE
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 ver
216 # -Zsanitizer=shadow-call-stack flag.
217 depends on !SHADOW_CALL_STACK || RUSTC
218
219 config CLANG_SUPPORTS_DYNAMIC_FTRACE
220 def_bool CC_IS_CLANG
221 # https://github.com/ClangBuiltLinux/l
222 depends on AS_IS_GNU || (AS_IS_LLVM &&
223
224 config GCC_SUPPORTS_DYNAMIC_FTRACE
225 def_bool CC_IS_GCC
226 depends on $(cc-option,-fpatchable-fun
227
228 config HAVE_SHADOW_CALL_STACK
229 def_bool $(cc-option,-fsanitize=shadow
230 # https://github.com/riscv-non-isa/ris
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
236 depends on !LD_IS_LLD || LLD_VERSION >
237
238 # https://github.com/llvm/llvm-project/commit/
239 config ARCH_HAS_BROKEN_DWARF5
240 def_bool y
241 depends on RISCV_USE_LINKER_RELAXATION
242 # https://github.com/llvm/llvm-project
243 depends on AS_IS_LLVM && AS_VERSION <
244 # https://github.com/llvm/llvm-project
245 depends on LD_IS_LLD && LLD_VERSION <
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
264 config RISCV_M_MODE
265 bool "Build a kernel that runs in mach
266 depends on !MMU
267 default y
268 help
269 Select this option if you want to ru
270 without the assistance of any other
271
272 # set if we are running in S-mode and can use
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 Managemen
280 default y
281 help
282 Select if you want MMU-based virtual
283 support by paged memory management.
284
285 config PAGE_OFFSET
286 hex
287 default 0x80000000 if !MMU && RISCV_M_
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 && SP
305 select SPARSEMEM_VMEMMAP_ENABLE if 64B
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 i
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
356
357 config RISCV_NONSTANDARD_CACHE_OPS
358 bool
359 help
360 This enables function pointer suppor
361 systems to handle cache management.
362
363 config AS_HAS_INSN
364 def_bool $(as-instr,.insn r 51$(comma)
365
366 config AS_HAS_OPTION_ARCH
367 # https://github.com/llvm/llvm-project
368 def_bool y
369 depends on $(as-instr, .option arch$(c
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
378 help
379 RISC-V kernel binaries are compatibl
380 whenever possible, but there are som
381 satisfied by configurations that res
382 not portable between systems.
383
384 Selecting N does not guarantee kerne
385 systems. Selecting any of the optio
386 result in kernel binaries that are u
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
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_
411 select SWIOTLB if MMU
412
413 endchoice
414
415 # We must be able to map all physical memory i
416 # is still a bit more efficient when generatin
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 wit
437 you say N here, the kernel will run
438 multiprocessor machines, but will us
439 multiprocessor machine. If you say Y
440 on many, but not all, single process
441 processor machine, the kernel will r
442 here.
443
444 If you don't know what to do here, s
445
446 config SCHED_MC
447 bool "Multi-core scheduler support"
448 depends on SMP
449 help
450 Multi-core scheduler support improve
451 making when dealing with multi-core
452 increased overhead in some places. I
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 turnin
470 can be controlled through /sys/devic
471
472 Say N if you want to disable CPU hot
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 Sched
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 Acce
496
497 The kernel will try to allocate memo
498 local memory of the CPU and add some
499
500 config NODES_SHIFT
501 int "Maximum NUMA Nodes (as a power of
502 range 1 10
503 default "2"
504 depends on NUMA
505 help
506 Specify the maximum number of NUMA N
507 system. Increases memory reserved t
508
509 config RISCV_ALTERNATIVE
510 bool
511 depends on !XIP_KERNEL
512 help
513 This Kconfig allows the kernel to au
514 erratum or cpufeature required by th
515 time. The code patching overhead is
516 once at boot and once on each module
517
518 config RISCV_ALTERNATIVE_EARLY
519 bool
520 depends on RISCV_ALTERNATIVE
521 help
522 Allows early patching of the kernel
523
524 config RISCV_ISA_C
525 bool "Emit compressed instructions whe
526 default y
527 help
528 Adds "C" to the ISA subsets that the
529 when building Linux, which results i
530 Linux binary.
531
532 If you don't know what to do here, s
533
534 config RISCV_ISA_SVNAPOT
535 bool "Svnapot extension support for su
536 depends on 64BIT && MMU
537 depends on RISCV_ALTERNATIVE
538 default y
539 help
540 Allow kernel to detect the Svnapot I
541 time and enable its usage.
542
543 The Svnapot extension is used to mar
544 of contiguous virtual-to-physical tr
545 aligned power-of-2 (NAPOT) granulari
546 size. When HUGETLBFS is also selecte
547 allocates some memory for each NAPOT
548 When optimizing for low memory consu
549 the Svnapot extension, it may be bet
550
551 If you don't know what to do here, s
552
553 config RISCV_ISA_SVPBMT
554 bool "Svpbmt extension support for sup
555 depends on 64BIT && MMU
556 depends on RISCV_ALTERNATIVE
557 default y
558 help
559 Adds support to dynamically detect
560 ISA-extension (Supervisor-mode: pag
561 enable its usage.
562
563 The memory type for a page contains
564 that indicate the cacheability, ide
565 properties for access to that page.
566
567 The Svpbmt extension is only availa
568
569 If you don't know what to do here,
570
571 config TOOLCHAIN_HAS_V
572 bool
573 default y
574 depends on !64BIT || $(cc-option,-mabi
575 depends on !32BIT || $(cc-option,-mabi
576 depends on LLD_VERSION >= 140000 || LD
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 al
587 in the kernel.
588
589 If you don't know what to do here, s
590
591 config RISCV_ISA_V_DEFAULT_ENABLE
592 bool "Enable userspace Vector by defau
593 depends on RISCV_ISA_V
594 default y
595 help
596 Say Y here if you want to enable Vec
597 Otherwise, userspace has to make exp
598 Vector, or enable it via the sysctl
599
600 If you don't know what to do here, s
601
602 config RISCV_ISA_V_UCOPY_THRESHOLD
603 int "Threshold size for vectorized use
604 depends on RISCV_ISA_V
605 default 768
606 help
607 Prefer using vectorized copy_to_user
608 workload size exceeds this value.
609
610 config RISCV_ISA_V_PREEMPTIVE
611 bool "Run kernel-mode Vector with kern
612 depends on PREEMPTION
613 depends on RISCV_ISA_V
614 default y
615 help
616 Usually, in-kernel SIMD routines are
617 Functions which envoke long running
618 vector unit to prevent blocking othe
619
620 This config allows kernel to run SIM
621 preemption. Enabling this config wil
622 consumption due to the allocation of
623
624 config RISCV_ISA_ZAWRS
625 bool "Zawrs extension support for more
626 depends on RISCV_ALTERNATIVE
627 default y
628 help
629 The Zawrs extension defines instruct
630 which allow a hart to enter a low-po
631 hypervisor while waiting on a store
632 use of these instructions in the ker
633 detected at boot.
634
635 If you don't know what to do here, s
636
637 config TOOLCHAIN_HAS_ZBB
638 bool
639 default y
640 depends on !64BIT || $(cc-option,-mabi
641 depends on !32BIT || $(cc-option,-mabi
642 depends on LLD_VERSION >= 150000 || LD
643 depends on AS_HAS_OPTION_ARCH
644
645 # This symbol indicates that the toolchain sup
646 # extensions, including Zvk*, Zvbb, and Zvbc.
647 # binutils added all except Zvkb, then added Z
648 config TOOLCHAIN_HAS_VECTOR_CRYPTO
649 def_bool $(as-instr, .option arch$(com
650 depends on AS_HAS_OPTION_ARCH
651
652 config RISCV_ISA_ZBA
653 bool "Zba extension support for bit ma
654 default y
655 help
656 Add support for enabling optimisati
657 extension is detected at boot.
658
659 The Zba extension provides instruct
660 of addresses that index into arrays
661
662 If you don't know what to do here,
663
664 config RISCV_ISA_ZBB
665 bool "Zbb extension support for bit ma
666 depends on TOOLCHAIN_HAS_ZBB
667 depends on RISCV_ALTERNATIVE
668 default y
669 help
670 Adds support to dynamically detect
671 extension (basic bit manipulation)
672
673 The Zbb extension provides instruct
674 of bit-specific operations (count b
675 bitrotation, etc).
676
677 If you don't know what to do here,
678
679 config TOOLCHAIN_HAS_ZBC
680 bool
681 default y
682 depends on !64BIT || $(cc-option,-mabi
683 depends on !32BIT || $(cc-option,-mabi
684 depends on LLD_VERSION >= 150000 || LD
685 depends on AS_HAS_OPTION_ARCH
686
687 config RISCV_ISA_ZBC
688 bool "Zbc extension support for carry-
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
695 extension (carry-less multiplicatio
696
697 The Zbc extension could accelerate
698 calculations.
699
700 If you don't know what to do here,
701
702 config RISCV_ISA_ZICBOM
703 bool "Zicbom extension support for non
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
711 extension (Cache Block Management O
712 usage.
713
714 The Zicbom extension can be used to
715 non-coherent DMA support on devices
716
717 If you don't know what to do here,
718
719 config RISCV_ISA_ZICBOZ
720 bool "Zicboz extension support for fas
721 depends on RISCV_ALTERNATIVE
722 default y
723 help
724 Enable the use of the Zicboz extens
725 when available.
726
727 The Zicboz extension is used for fa
728
729 If you don't know what to do here,
730
731 config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
732 def_bool y
733 # https://sourceware.org/git/?p=binuti
734 # https://gcc.gnu.org/git/?p=gcc.git;a
735 depends on AS_IS_GNU && AS_VERSION >=
736 help
737 Binutils-2.38 and GCC-12.1.0 bumped
738 20191213 version, which moves some i
739 the Zicsr and Zifencei extensions. T
740 Zicsr and Zifencei when binutils >=
741 and Zifencei are supported in binuti
742 To make life easier, and avoid forci
743 newer ISA spec to version 2.2, relax
744 For clang < 17 or GCC < 11.3.0, for
745 special treatment, this is dealt wit
746
747 config TOOLCHAIN_NEEDS_OLD_ISA_SPEC
748 def_bool y
749 depends on TOOLCHAIN_NEEDS_EXPLICIT_ZI
750 # https://github.com/llvm/llvm-project
751 # https://gcc.gnu.org/git/?p=gcc.git;a
752 depends on (CC_IS_CLANG && CLANG_VERSI
753 help
754 Certain versions of clang and GCC do
755 -march. This option causes an older
756 versions of clang and GCC to be pass
757 as passing zicsr and zifencei to -ma
758
759 config FPU
760 bool "FPU support"
761 default y
762 help
763 Say N here if you want to disable al
764 in the kernel.
765
766 If you don't know what to do here, s
767
768 config IRQ_STACKS
769 bool "Independent irq & softirq stacks
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
775 overflows. We may save some memory f
776
777 config THREAD_SIZE_ORDER
778 int "Kernel stack size (in power-of-tw
779 range 0 4
780 default 1 if 32BIT
781 default 2
782 help
783 Specify the Pages of thread stack si
784 affects irq stack size, which is equ
785
786 config RISCV_MISALIGNED
787 bool
788 select SYSCTL_ARCH_UNALIGN_ALLOW
789 help
790 Embed support for emulating misalign
791
792 choice
793 prompt "Unaligned Accesses Support"
794 default RISCV_PROBE_UNALIGNED_ACCESS
795 help
796 This determines the level of support
797 information is used by the kernel to
798 exposed to user space via the hwprob
799 probed at boot by default.
800
801 config RISCV_PROBE_UNALIGNED_ACCESS
802 bool "Probe for hardware unaligned acc
803 select RISCV_MISALIGNED
804 help
805 During boot, the kernel will run a s
806 speed of unaligned accesses. This pr
807 the speed of unaligned accesses on t
808 memory accesses trap into the kernel
809 system, the kernel will emulate the
810 UABI.
811
812 config RISCV_EMULATED_UNALIGNED_ACCESS
813 bool "Emulate unaligned access where s
814 select RISCV_MISALIGNED
815 help
816 If unaligned memory accesses trap in
817 supported by the system, the kernel
818 accesses to preserve the UABI. When
819 unaligned accesses, the unaligned ac
820
821 config RISCV_SLOW_UNALIGNED_ACCESS
822 bool "Assume the system supports slow
823 depends on NONPORTABLE
824 help
825 Assume that the system supports slow
826 kernel and userspace programs may no
827 that do not support unaligned memory
828
829 config RISCV_EFFICIENT_UNALIGNED_ACCESS
830 bool "Assume the system supports fast
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
836 enabled, this option improves the pe
837 systems. However, the kernel and use
838 slowly, or will not be able to run a
839 support efficient unaligned memory a
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
856 deprecated in future once legacy M-m
857
858 config RISCV_BOOT_SPINWAIT
859 bool "Spinwait booting method"
860 depends on SMP
861 default y if RISCV_SBI_V01 || RISCV_M_
862 help
863 This enables support for booting Lin
864 spinwait method, all cores randomly
865 gets chosen via lottery and all othe
866 variable. This method cannot support
867 scheme. It should be only enabled fo
868 on older firmware without SBI HSM ex
869 rely on ordered booting via SBI HSM
870 dynamically at runtime if the firmwa
871
872 Since spinwait is incompatible with
873 NR_CPUS be large enough to contain t
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_RESERVATIO
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
910 kernel at S-mode. riscv32-specific c
911 the user helper functions (vdso), si
912 ptrace interface are handled appropr
913
914 If you want to execute 32-bit usersp
915
916 config PARAVIRT
917 bool "Enable paravirtualization code"
918 depends on RISCV_SBI
919 help
920 This changes the kernel so it can mo
921 under a hypervisor, potentially impr
922 over full virtualization.
923
924 config PARAVIRT_TIME_ACCOUNTING
925 bool "Paravirtual steal time accountin
926 depends on PARAVIRT
927 help
928 Select this option to enable fine gr
929 accounting. Time spent executing oth
930 the current vCPU is discounted from
931 that, there can be a small performan
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 I
941 which retains all relocation metadat
942 kernel binary at runtime to a differ
943 address it was linked at.
944 Since RISCV uses the RELA relocation
945 relocation pass at runtime even if t
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 ker
952 select RELOCATABLE
953 depends on MMU && 64BIT && !XIP_KERNEL
954 help
955 Randomizes the virtual address at wh
956 loaded, as a security feature that d
957 relying on knowledge of the location
958
959 It is the bootloader's job to provid
960 random u64 value in /chosen/kaslr-se
961
962 When booting via the UEFI stub, it w
963 EFI_RNG_PROTOCOL implementation (if
964 to the kernel proper. In addition, i
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 fo
977 are provided at run-time, during boo
978 where either no arguments are being
979 arguments are insufficient or even i
980
981 When that occurs, it is possible to
982 line here and choose how the kernel
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 th
990 line.
991
992 config CMDLINE_FALLBACK
993 bool "Use bootloader kernel arguments
994 help
995 Use the built-in command line as fal
996 during boot. This is the default beh
997
998 config CMDLINE_EXTEND
999 bool "Extend bootloader kernel argumen
1000 help
1001 The command-line arguments provided
1002 appended to the built-in command li
1003 cases where the provided arguments
1004 you don't want to or cannot modify
1005
1006 config CMDLINE_FORCE
1007 bool "Always use the default kernel c
1008 help
1009 Always use the built-in command lin
1010 boot. This is useful in case you ne
1011 command line on systems where you d
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 ru
1034 by UEFI firmware (such as non-volat
1035 clock, and platform reset). A UEFI
1036 allow the kernel to be booted as an
1037 is only useful on systems that have
1038
1039 config DMI
1040 bool "Enable support for SMBIOS (DMI)
1041 depends on EFI
1042 default y
1043 help
1044 This enables SMBIOS/DMI feature for
1045
1046 This option is only useful on syste
1047 However, even with this option, the
1048 continue to boot on existing non-UE
1049
1050 config CC_HAVE_STACKPROTECTOR_TLS
1051 def_bool $(cc-option,-mstack-protecto
1052
1053 config STACKPROTECTOR_PER_TASK
1054 def_bool y
1055 depends on !RANDSTRUCT
1056 depends on STACKPROTECTOR && CC_HAVE_
1057
1058 config PHYS_RAM_BASE_FIXED
1059 bool "Explicitly specified physical R
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
1069 explicitly specified to run early r
1070 from flash to RAM.
1071
1072 config XIP_KERNEL
1073 bool "Kernel Execute-In-Place from RO
1074 depends on MMU && SPARSEMEM && NONPOR
1075 # This prevents XIP from being enable
1076 # fail to build since XIP doesn't sup
1077 depends on !COMPILE_TEST
1078 select PHYS_RAM_BASE_FIXED
1079 help
1080 Execute-In-Place allows the kernel
1081 directly addressable by the CPU, su
1082 space since the text section of the
1083 to RAM. Read-write sections, such
1084 are still copied to RAM. The XIP k
1085 it has to run directly from flash,
1086 store it. The flash address used t
1087 and for storing it, is configuratio
1088 say Y here, you must know the prope
1089 store the kernel image depending on
1090
1091 Also note that the make target beco
1092 "make zImage" or "make Image". The
1093 ROM memory will be arch/riscv/boot/
1094
1095 SPARSEMEM is required because the k
1096 flash resident are not backed by me
1097 a struct page on those regions will
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 you
1107 be linked for and stored to. This
1108 own flash usage.
1109
1110 config RISCV_ISA_FALLBACK
1111 bool "Permit falling back to parsing
1112 default y
1113 help
1114 Parsing the "riscv,isa" devicetree
1115 replaced by a list of explicitly de
1116 with existing platforms, the kernel
1117 "riscv,isa" property if the replace
1118
1119 Selecting N here will result in a k
1120 fallback, unless the commandline "r
1121 present.
1122
1123 Please see the dt-binding, located
1124 Documentation/devicetree/bindings/r
1125 on the replacement properties, "ris
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
1133 This option should be selected if n
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, rela
1142 for the DTS file that will be used
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"
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