Kconfig - OpenGrok cross reference for /linux-6.15/arch/riscv/Kconfig

1 # SPDX-License-Identifier: GPL-2.0-only
4 # see Documentation/kbuild/kconfig-language.rst.
70 	# LLD >= 14: https://github.com/llvm/llvm-project/issues/50505
226 	depends on 64BIT
228 	# -Zsanitizer=shadow-call-stack flag.
229 	depends on !SHADOW_CALL_STACK || RUSTC_VERSION >= 108200
234 	depends on AS_IS_GNU || (AS_IS_LLVM && (LD_IS_LLD || LD_VERSION >= 23600))
238 	depends on $(cc-option,-fpatchable-function-entry=8)
241 	def_bool $(cc-option,-fsanitize=shadow-call-stack)
242 …# https://github.com/riscv-non-isa/riscv-elf-psabi-doc/commit/a484e843e6eeb51f0cb7b8819e50da6d2444…
243 	depends on $(ld-option,--no-relax-gp)
247 	# https://github.com/llvm/llvm-project/commit/6611d58f5bbcbec77262d392e2923e1d680f6985
248 	depends on !LD_IS_LLD || LLD_VERSION >= 150000
250 # https://github.com/llvm/llvm-project/commit/bbc0f99f3bc96f1db16f649fc21dd18e5b0918f6
253 	depends on RISCV_USE_LINKER_RELAXATION
254 	# https://github.com/llvm/llvm-project/commit/1df5ea29b43690b6622db2cad7b745607ca4de6a
255 	depends on AS_IS_LLVM && AS_VERSION < 180000
256 	# https://github.com/llvm/llvm-project/commit/7ffabb61a5569444b5ac9322e22e5471cc5e4a77
257 	depends on LD_IS_LLD && LLD_VERSION < 180000
260 	default 18 if 64BIT
261 	default 8
264 	default 8
267 #  VA_BITS - PAGE_SHIFT - 3
269 	default 24 if 64BIT # SV39 based
270 	default 17
273 	default 17
278 	depends on !MMU
279 	default y
281 	  Select this option if you want to run the kernel in M-mode,
284 # set if we are running in S-mode and can use SBI calls
287 	depends on !RISCV_M_MODE
288 	default y
291 	bool "MMU-based Paged Memory Management Support"
292 	default y
294 	  Select if you want MMU-based virtualised addressing space
299 	depends on KASAN_GENERIC
300 	default 0xdfffffff00000000 if 64BIT
301 	default 0xffffffff if 32BIT
308 	depends on MMU
323 	depends on BUG
343 	default 0 if 32BIT
344 	default 0xdead000000000000 if 64BIT
348 	default 5 if 64BIT
349 	default 2
365 	  This enables function pointer support for non-standard noncoherent
369 	def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)
372 	# https://github.com/llvm/llvm-project/commit/9e8ed3403c191ab9c4903e8eeb8f732ff8a43cb4
374 	depends on $(as-instr, .option arch$(comma) +m)
382 	bool "Allow configurations that result in non-portable kernels"
384 	  RISC-V kernel binaries are compatible between all known systems
398 	default ARCH_RV64I
405 	depends on NONPORTABLE
425 	default CMODEL_MEDLOW if 32BIT
426 	default CMODEL_MEDANY if 64BIT
439 	bool "Symmetric Multi-Processing"
442 	  you say N here, the kernel will run on single and
445 	  on many, but not all, single processor machines. On a single
452 	bool "Multi-core scheduler support"
453 	depends on SMP
455 	  Multi-core scheduler support improves the CPU scheduler's decision
456 	  making when dealing with multi-core CPU chips at a cost of slightly
460 	int "Maximum number of CPUs (2-512)"
461 	depends on SMP
465 	default "32" if 32BIT
466 	default "64" if 64BIT
469 	bool "Support for hot-pluggable CPUs"
470 	depends on SMP
474 	  Say Y here to experiment with turning CPUs off and on.  CPUs
481 	default TUNE_GENERIC
491 	depends on SMP && MMU
500 	  Enable NUMA (Non-Uniform Memory Access) support.
502 	  The kernel will try to allocate memory used by a CPU on the
508 	default "2"
509 	depends on NUMA
511 	  Specify the maximum number of NUMA Nodes available on the target
515 	prompt "RISC-V spinlock type"
516 	default RISCV_COMBO_SPINLOCKS
523 	depends on SMP && MMU && NONPORTABLE
530 	  Select this if and only if Zabha or Ziccrse is available on your
539 	depends on SMP && MMU
549 	depends on !XIP_KERNEL
554 	  once at boot and once on each module load.
558 	depends on RISCV_ALTERNATIVE
564 	default y
568 	  Linux binary. This option produces a kernel that will not run on
575 	depends on 64BIT
576 	default y
586 	depends on 64BIT && MMU
587 	depends on RISCV_ALTERNATIVE
588 	default y
590 	  Enable support for the Svnapot ISA-extension when it is detected
594 	  of contiguous virtual-to-physical translations for a naturally
595 	  aligned power-of-2 (NAPOT) granularity larger than the base 4KB page
604 	bool "Svpbmt extension support for supervisor mode page-based memory types"
605 	depends on 64BIT && MMU
606 	depends on RISCV_ALTERNATIVE
607 	default y
609 	   Add support for the Svpbmt ISA-extension (Supervisor-mode:
610 	   page-based memory types) in the kernel when it is detected at boot.
616 	   The Svpbmt extension is only available on 64-bit cpus.
622 	default y
623 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64imv)
624 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32imv)
625 	depends on LLD_VERSION >= 140000 || LD_VERSION >= 23800
626 	depends on AS_HAS_OPTION_ARCH
630 	depends on TOOLCHAIN_HAS_V
631 	depends on FPU
633 	default y
642 	bool "Enable userspace Vector by default"
643 	depends on RISCV_ISA_V
644 	default y
646 	  Say Y here if you want to enable Vector in userspace by default.
654 	depends on RISCV_ISA_V
655 	default 768
661 	bool "Run kernel-mode Vector with kernel preemption"
662 	depends on PREEMPTION
663 	depends on RISCV_ISA_V
664 	default y
666 	  Usually, in-kernel SIMD routines are run with preemption disabled.
672 	  consumption due to the allocation of per-task's kernel Vector context.
676 	depends on RISCV_ALTERNATIVE
677 	default y
680 	  which allow a hart to enter a low-power state or to trap to the
681 	  hypervisor while waiting on a store to a memory location. Enable the
687 	default y
688 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zabha)
689 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zabha)
690 	depends on AS_HAS_OPTION_ARCH
694 	depends on TOOLCHAIN_HAS_ZABHA
695 	depends on RISCV_ALTERNATIVE
696 	default y
698 	  Enable the use of the Zabha ISA-extension to implement kernel
705 	default y
706 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zacas)
707 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zacas)
708 	depends on AS_HAS_OPTION_ARCH
712 	depends on TOOLCHAIN_HAS_ZACAS
713 	depends on RISCV_ALTERNATIVE
714 	default y
716 	  Enable the use of the Zacas ISA-extension to implement kernel atomic
723 	default y
724 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbb)
725 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbb)
726 	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
727 	depends on AS_HAS_OPTION_ARCH
733 	def_bool $(as-instr, .option arch$(comma) +v$(comma) +zvkb)
734 	depends on AS_HAS_OPTION_ARCH
738 	default y
739 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zba)
740 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zba)
741 	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
742 	depends on AS_HAS_OPTION_ARCH
746 	default y
758 	depends on RISCV_ALTERNATIVE
759 	default y
763 	   additionally depend on toolchain support for Zbb.
766 	   of bit-specific operations (count bit population, sign extending,
773 	default y
774 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbc)
775 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbc)
776 	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
777 	depends on AS_HAS_OPTION_ARCH
780 	bool "Zbc extension support for carry-less multiplication instructions"
781 	depends on TOOLCHAIN_HAS_ZBC
782 	depends on MMU
783 	depends on RISCV_ALTERNATIVE
784 	default y
787 	   extension (carry-less multiplication) and enable its usage.
796 	default y
797 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbkb)
798 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbkb)
799 	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
800 	depends on AS_HAS_OPTION_ARCH
804 	depends on TOOLCHAIN_HAS_ZBKB
805 	depends on RISCV_ALTERNATIVE
806 	default y
817 	bool "Zicbom extension support for non-coherent DMA operation"
818 	depends on MMU
819 	depends on RISCV_ALTERNATIVE
820 	default y
829 	   non-coherent DMA support on devices that need it.
835 	depends on RISCV_ALTERNATIVE
836 	default y
847 …# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6…
849 	depends on AS_IS_GNU && AS_VERSION >= 23600
851 	  Binutils-2.38 and GCC-12.1.0 bumped the default ISA spec to the newer
856 	  To make life easier, and avoid forcing toolchains that default to a
863 	depends on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
864 	# https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
866 	depends on (CC_IS_CLANG && CLANG_VERSION < 170000) || (CC_IS_GCC && GCC_VERSION < 110300)
869 	  -march. This option causes an older ISA spec compatible with these older
871 	  as passing zicsr and zifencei to -march.
875 	default y
885 	default y
893 	int "Kernel stack size (in power-of-two numbers of page size)" if VMAP_STACK && EXPERT
895 	default 1 if 32BIT
896 	default 2
917 	depends on RISCV_ISA_V
923 	default RISCV_PROBE_UNALIGNED_ACCESS
928 	  probed at boot by default.
936 	  the speed of unaligned accesses on the underlying system. If unaligned
952 	depends on NONPORTABLE
955 	  kernel and userspace programs may not be able to run at all on systems
960 	depends on NONPORTABLE
965 	  enabled, this option improves the performance of the kernel on such
967 	  slowly, or will not be able to run at all, on systems that do not
974 	depends on RISCV_ISA_V
975 	default RISCV_PROBE_VECTOR_UNALIGNED_ACCESS
980 	  probed at boot by default.
985 	depends on RISCV_ISA_V
989 	  will dynamically determine the speed of vector unaligned accesses on
994 	depends on NONPORTABLE
997 	  kernel and userspace programs may not be able to run at all on systems
1002 	depends on NONPORTABLE
1005 	  enabled, this option improves the performance of the kernel on such
1007 	  slowly, or will not be able to run at all, on systems that do not
1022 	depends on RISCV_SBI
1025 	  deprecated in future once legacy M-mode software are no longer in use.
1029 	depends on SMP
1030 	default y if RISCV_SBI_V01 || RISCV_M_MODE
1034 	  gets chosen via lottery and all other keep spinning on a percpu
1036 	  scheme. It should be only enabled for M-mode Linux or platforms relying
1037 	  on older firmware without SBI HSM extension. All other platforms should
1038 	  rely on ordered booting via SBI HSM extension which gets chosen
1052 	depends on KEXEC
1060 	depends on KEXEC_FILE
1077 	bool "Kernel support for 32-bit U-mode"
1078 	default 64BIT
1079 	depends on 64BIT && MMU
1081 	  This option enables support for a 32-bit U-mode running under a 64-bit
1082 	  kernel at S-mode. riscv32-specific components such as system calls,
1086 	  If you want to execute 32-bit userspace applications, say Y.
1090 	depends on RISCV_SBI
1098 	depends on PARAVIRT
1109 	depends on !XIP_KERNEL
1126         depends on MMU && 64BIT && !XIP_KERNEL
1130           relying on knowledge of the location of kernel internals.
1133           random u64 value in /chosen/kaslr-seed at kernel entry.
1147 	string "Built-in kernel command line"
1150 	  are provided at run-time, during boot. However, there are cases
1154 	  When that occurs, it is possible to define a built-in command
1155 	  line here and choose how the kernel should use it later on.
1158 	prompt "Built-in command line usage"
1159 	depends on CMDLINE != ""
1160 	default CMDLINE_FALLBACK
1162 	  Choose how the kernel will handle the provided built-in command
1168 	  Use the built-in command line as fallback in case we get nothing
1169 	  during boot. This is the default behaviour.
1174 	  The command-line arguments provided during boot will be
1175 	  appended to the built-in command line. This is useful in
1180 	bool "Always use the default kernel command string"
1182 	  Always use the built-in command line, even if we get one during
1184 	  command line on systems where you don't have or want control
1194 	depends on OF && !XIP_KERNEL
1195 	depends on MMU
1196 	default y
1207 	  by UEFI firmware (such as non-volatile variables, realtime
1210 	  is only useful on systems that have UEFI firmware.
1214 	depends on EFI
1215 	default y
1219 	  This option is only useful on systems that have UEFI firmware.
1221 	  continue to boot on existing non-UEFI platforms.
1224 …def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-…
1228 	depends on !RANDSTRUCT
1229 	depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
1233 	depends on NONPORTABLE
1234 	default n
1238 	depends on PHYS_RAM_BASE_FIXED
1239 	default "0x80000000"
1242 	  explicitly specified to run early relocations of read-write data
1246 	bool "Kernel Execute-In-Place from ROM"
1247 	depends on MMU && SPARSEMEM && NONPORTABLE
1250 	depends on !COMPILE_TEST
1253 	  Execute-In-Place allows the kernel to run from non-volatile storage
1256 	  to RAM.  Read-write sections, such as the data section and stack,
1262 	  store the kernel image depending on your own flash memory usage.
1270 	  a struct page on those regions will trigger a fault.
1276 	depends on XIP_KERNEL
1277 	default "0x21000000"
1280 	  be linked for and stored to.  This address is dependent on your
1284 	bool "Permit falling back to parsing riscv,isa for extension support by default"
1285 	default y
1296 	  Please see the dt-binding, located at
1298 	  on the replacement properties, "riscv,isa-base" and
1299 	  "riscv,isa-extensions".
1302 	bool "Built-in device tree"
1303 	depends on OF && NONPORTABLE
1312 	string "Built-in device tree source"
1313 	depends on BUILTIN_DTB
1323 	default !NONPORTABLE