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
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
196 # https://github.com/llvm/llvm-project/commit/bbc0f99f3bc96f1db16f649fc21dd18e5b0918f6
200 	# https://github.com/llvm/llvm-project/commit/1df5ea29b43690b6622db2cad7b745607ca4de6a
202 	# https://github.com/llvm/llvm-project/commit/7ffabb61a5569444b5ac9322e22e5471cc5e4a77
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
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
248 	default 0xdfffffff00000000 if 64BIT
249 	default 0xffffffff if 32BIT
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
368 	default CMODEL_MEDLOW if 32BIT
369 	default CMODEL_MEDANY if 64BIT
382 	bool "Symmetric Multi-Processing"
395 	bool "Multi-core scheduler support"
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)"
408 	default "32" if 32BIT
409 	default "64" if 64BIT
412 	bool "Support for hot-pluggable CPUs"
424 	default TUNE_GENERIC
443 	  Enable NUMA (Non-Uniform Memory Access) support.
451 	default "2"
474 	default y
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"
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)
532 	default y
540 	bool "Enable userspace Vector by default"
542 	default y
544 	  Say Y here if you want to enable Vector in userspace by default.
553 	default 768
559 	bool "Run kernel-mode Vector with kernel preemption"
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)
585 	default y
591 	   of bit-specific operations (count bit population, sign extending,
597 	bool "Zicbom extension support for non-coherent DMA operation"
600 	default y
609 	   non-coherent DMA support on devices that need it.
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)
635 …# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6…
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
652 	# https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
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
723 	  deprecated in future once legacy M-mode software are no longer in use.
728 	default y if RISCV_SBI_V01 || RISCV_M_MODE
734 	  scheme. It should be only enabled for M-mode Linux or platforms relying
772 	bool "Kernel support for 32-bit U-mode"
773 	default 64BIT
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.
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
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
888 	default y
899 	  by UEFI firmware (such as non-volatile variables, realtime
905 …def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-…
915 	default n
920 	default "0x80000000"
923 	  explicitly specified to run early relocations of read-write data
927 	bool "Kernel Execute-In-Place from ROM"
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,
958 	default "0x21000000"
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"
985 	default y if XIP_KERNEL
991 	default !NONPORTABLE