Kconfig - OpenGrok cross reference for /linux-6.8/arch/riscv/Kconfig

1 # SPDX-License-Identifier: GPL-2.0-only
4 # see Documentation/kbuild/kconfig-language.rst.
177 	# https://github.com/llvm/llvm-project/commit/6ab8927931851bb42b2c93a00801dc499d7d9b1e
178 	depends on CLANG_VERSION >= 130000
180 	depends on AS_IS_GNU || (AS_IS_LLVM && (LD_IS_LLD || LD_VERSION >= 23600))
184 	depends on $(cc-option,-fpatchable-function-entry=8)
187 	def_bool $(cc-option,-fsanitize=shadow-call-stack)
188 …# https://github.com/riscv-non-isa/riscv-elf-psabi-doc/commit/a484e843e6eeb51f0cb7b8819e50da6d2444…
189 	depends on $(ld-option,--no-relax-gp)
193 	# https://github.com/llvm/llvm-project/commit/6611d58f5bbcbec77262d392e2923e1d680f6985
194 	depends on !LD_IS_LLD || LLD_VERSION >= 150000
196 # https://github.com/llvm/llvm-project/commit/bbc0f99f3bc96f1db16f649fc21dd18e5b0918f6
199 	depends on RISCV_USE_LINKER_RELAXATION
200 	# https://github.com/llvm/llvm-project/commit/1df5ea29b43690b6622db2cad7b745607ca4de6a
201 	depends on AS_IS_LLVM && AS_VERSION < 180000
202 	# https://github.com/llvm/llvm-project/commit/7ffabb61a5569444b5ac9322e22e5471cc5e4a77
203 	depends on LD_IS_LLD && LLD_VERSION < 180000
206 	default 18 if 64BIT
207 	default 8
210 	default 8
213 #  VA_BITS - PAGE_SHIFT - 3
215 	default 24 if 64BIT # SV39 based
216 	default 17
219 	default 17
224 	default !MMU
226 # set if we are running in S-mode and can use SBI calls
229 	depends on !RISCV_M_MODE
230 	default y
233 	bool "MMU-based Paged Memory Management Support"
234 	default y
236 	  Select if you want MMU-based virtualised addressing space
241 	default 0xC0000000 if 32BIT && MMU
242 	default 0x80000000 if !MMU
243 	default 0xff60000000000000 if 64BIT
247 	depends on KASAN_GENERIC
248 	default 0xdfffffff00000000 if 64BIT
249 	default 0xffffffff if 32BIT
256 	depends on MMU
271 	depends on BUG
291 	default 5 if 64BIT
292 	default 2
308 	  This enables function pointer support for non-standard noncoherent
312 	def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)
317 	depends on $(as-instr, .option arch$(comma) +m)
325 	bool "Allow configurations that result in non-portable kernels"
327 	  RISC-V kernel binaries are compatible between all known systems
341 	default ARCH_RV64I
348 	depends on NONPORTABLE
368 	default CMODEL_MEDLOW if 32BIT
369 	default CMODEL_MEDANY if 64BIT
382 	bool "Symmetric Multi-Processing"
385 	  you say N here, the kernel will run on single and
388 	  on many, but not all, single processor machines. On a single
395 	bool "Multi-core scheduler support"
396 	depends on SMP
398 	  Multi-core scheduler support improves the CPU scheduler's decision
399 	  making when dealing with multi-core CPU chips at a cost of slightly
403 	int "Maximum number of CPUs (2-512)"
404 	depends on SMP
408 	default "32" if 32BIT
409 	default "64" if 64BIT
412 	bool "Support for hot-pluggable CPUs"
413 	depends on SMP
417 	  Say Y here to experiment with turning CPUs off and on.  CPUs
424 	default TUNE_GENERIC
434 	depends on SMP && MMU
443 	  Enable NUMA (Non-Uniform Memory Access) support.
445 	  The kernel will try to allocate memory used by a CPU on the
451 	default "2"
452 	depends on NUMA
454 	  Specify the maximum number of NUMA Nodes available on the target
459 	depends on !XIP_KERNEL
464 	  once at boot and once on each module load.
468 	depends on RISCV_ALTERNATIVE
474 	default y
484 	depends on 64BIT && MMU
485 	depends on RISCV_ALTERNATIVE
486 	default y
488 	  Allow kernel to detect the Svnapot ISA-extension dynamically at boot
492 	  of contiguous virtual-to-physical translations for a naturally
493 	  aligned power-of-2 (NAPOT) granularity larger than the base 4KB page
502 	bool "Svpbmt extension support for supervisor mode page-based memory types"
503 	depends on 64BIT && MMU
504 	depends on RISCV_ALTERNATIVE
505 	default y
508 	   ISA-extension (Supervisor-mode: page-based memory types) and
515 	   The Svpbmt extension is only available on 64-bit cpus.
521 	default y
522 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64iv)
523 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32iv)
524 	depends on LLD_VERSION >= 140000 || LD_VERSION >= 23800
525 	depends on AS_HAS_OPTION_ARCH
529 	depends on TOOLCHAIN_HAS_V
530 	depends on FPU
532 	default y
540 	bool "Enable userspace Vector by default"
541 	depends on RISCV_ISA_V
542 	default y
544 	  Say Y here if you want to enable Vector in userspace by default.
552 	depends on RISCV_ISA_V
553 	default 768
559 	bool "Run kernel-mode Vector with kernel preemption"
560 	depends on PREEMPTION
561 	depends on RISCV_ISA_V
562 	default y
564 	  Usually, in-kernel SIMD routines are run with preemption disabled.
570 	  consumption due to the allocation of per-task's kernel Vector context.
574 	default y
575 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbb)
576 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbb)
577 	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
578 	depends on AS_HAS_OPTION_ARCH
582 	depends on TOOLCHAIN_HAS_ZBB
583 	depends on MMU
584 	depends on RISCV_ALTERNATIVE
585 	default y
591 	   of bit-specific operations (count bit population, sign extending,
597 	bool "Zicbom extension support for non-coherent DMA operation"
598 	depends on MMU
599 	depends on RISCV_ALTERNATIVE
600 	default y
609 	   non-coherent DMA support on devices that need it.
615 	depends on MMU
616 	depends on RISCV_ALTERNATIVE
617 	default y
628 	default y
629 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zihintpause)
630 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zihintpause)
631 	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23600
635 …# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6…
637 	depends on AS_IS_GNU && AS_VERSION >= 23600
639 	  Binutils-2.38 and GCC-12.1.0 bumped the default ISA spec to the newer
644 	  To make life easier, and avoid forcing toolchains that default to a
651 	depends on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
652 	# https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
654 	depends on (CC_IS_CLANG && CLANG_VERSION < 170000) || (CC_IS_GCC && GCC_VERSION < 110300)
657 	  -march. This option causes an older ISA spec compatible with these older
659 	  as passing zicsr and zifencei to -march.
663 	default y
665 	  Say N here if you want to disable all floating-point related procedure
672 	default y
680 	int "Kernel stack size (in power-of-two numbers of page size)" if VMAP_STACK && EXPERT
682 	default 1 if 32BIT && !KASAN
683 	default 3 if 64BIT && KASAN
684 	default 2
692 	default y
700 	depends on NONPORTABLE
706 	  improves the performance of the kernel on such CPUs.  However, the
708 	  on CPUs that do not support efficient unaligned memory accesses.
720 	depends on RISCV_SBI
723 	  deprecated in future once legacy M-mode software are no longer in use.
727 	depends on SMP
728 	default y if RISCV_SBI_V01 || RISCV_M_MODE
732 	  gets chosen via lottery and all other keep spinning on a percpu
734 	  scheme. It should be only enabled for M-mode Linux or platforms relying
735 	  on older firmware without SBI HSM extension. All other platforms should
736 	  rely on ordered booting via SBI HSM extension which gets chosen
750 	depends on KEXEC
758 	depends on KEXEC_FILE
772 	bool "Kernel support for 32-bit U-mode"
773 	default 64BIT
774 	depends on 64BIT && MMU
776 	  This option enables support for a 32-bit U-mode running under a 64-bit
777 	  kernel at S-mode. riscv32-specific components such as system calls,
781 	  If you want to execute 32-bit userspace applications, say Y.
785 	depends on RISCV_SBI
793 	depends on PARAVIRT
804 	depends on MMU && 64BIT && !XIP_KERNEL
819         depends on MMU && 64BIT && !XIP_KERNEL
823           relying on knowledge of the location of kernel internals.
826           random u64 value in /chosen/kaslr-seed at kernel entry.
840 	string "Built-in kernel command line"
843 	  are provided at run-time, during boot. However, there are cases
847 	  When that occurs, it is possible to define a built-in command
848 	  line here and choose how the kernel should use it later on.
851 	prompt "Built-in command line usage" if CMDLINE != ""
852 	default CMDLINE_FALLBACK
854 	  Choose how the kernel will handle the provided built-in command
860 	  Use the built-in command line as fallback in case we get nothing
861 	  during boot. This is the default behaviour.
866 	  The command-line arguments provided during boot will be
867 	  appended to the built-in command line. This is useful in
872 	bool "Always use the default kernel command string"
874 	  Always use the built-in command line, even if we get one during
876 	  command line on systems where you don't have or want control
886 	depends on OF && !XIP_KERNEL
887 	depends on MMU
888 	default y
899 	  by UEFI firmware (such as non-volatile variables, realtime
902 	  is only useful on systems that have UEFI firmware.
905 …def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-…
909 	depends on !RANDSTRUCT
910 	depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
914 	depends on NONPORTABLE
915 	default n
919 	depends on PHYS_RAM_BASE_FIXED
920 	default "0x80000000"
923 	  explicitly specified to run early relocations of read-write data
927 	bool "Kernel Execute-In-Place from ROM"
928 	depends on MMU && SPARSEMEM && NONPORTABLE
931 	depends on !COMPILE_TEST
934 	  Execute-In-Place allows the kernel to run from non-volatile storage
937 	  to RAM.  Read-write sections, such as the data section and stack,
943 	  store the kernel image depending on your own flash memory usage.
951 	  a struct page on those regions will trigger a fault.
957 	depends on XIP_KERNEL
958 	default "0x21000000"
961 	  be linked for and stored to.  This address is dependent on your
965 	bool "Permit falling back to parsing riscv,isa for extension support by default"
966 	default y
977 	  Please see the dt-binding, located at
979 	  on the replacement properties, "riscv,isa-base" and
980 	  "riscv,isa-extensions".
983 	bool "Built-in device tree"
984 	depends on OF && NONPORTABLE
985 	default y if XIP_KERNEL
991 	default !NONPORTABLE
1003 # Hibernation is only possible on systems where the SBI implementation has