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/linux/arch/riscv/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
4 # see Documentation/kbuild/kconfig-language.rst.
13 config RISCV config
65 # clang >= 17: https://github.com/llvm/llvm-project/commit/62fa708ceb027713b386c7e0efda994f8bdc27e2
234 # -Zsanitizer=shadow-call-stack flag.
244 depends on $(cc-option,-fpatchable-function-entry=8)
248 def_bool $(cc-option,-fsanitize=shadow-call-stack)
249 …# https://github.com/riscv-non-isa/riscv-elf-psabi-doc/commit/a484e843e6eeb51f0cb7b8819e50da6d2444…
250 depends on $(ld-option,--no-relax-gp)
252 # https://github.com/llvm/llvm-project/commit/bbc0f99f3bc96f1db16f649fc21dd18e5b0918f6
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H A DMakefile2 # architecture-specific flags and dependencies.
9 LDFLAGS_vmlinux := -z norelro
11 LDFLAGS_vmlinux += -shared -Bsymbolic -z notext
12 KBUILD_CFLAGS += -fPIE
15 LDFLAGS_vmlinux += --no-relax
16 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
18 CC_FLAGS_FTRACE := -fpatchable-function-entry=8,4
20 CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2
25 KBUILD_CFLAGS_MODULE += -mcmodel=medany
33 KBUILD_CFLAGS += -mabi=lp64
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/linux/Documentation/arch/riscv/
H A Dhwprobe.rst1 .. SPDX-License-Identifier: GPL-2.0
3 RISC-V Hardware Probing Interface
4 ---------------------------------
6 The RISC-V hardware probing interface is based around a single syscall, which
18 The arguments are split into three groups: an array of key-value pairs, a CPU
19 set, and some flags. The key-value pairs are supplied with a count. Userspace
22 will be cleared to -1, and its value set to 0. The CPU set is defined by
23 CPU_SET(3) with size ``cpusetsize`` bytes. For value-like keys (eg. vendor,
25 have the same value. Otherwise -1 will be returned. For boolean-like keys, the
33 by sys_riscv_hwprobe() to only those which match each of the key-value pairs.
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/linux/arch/riscv/kernel/
H A Dcpufeature.c1 // SPDX-License-Identifier: GPL-2.0-only
24 #include <asm/text-patching.h>
32 #define NUM_ALPHA_EXTS ('z' - 'a' + 1)
43 /* Per-cpu ISA extensions. */
49 * riscv_isa_extension_base() - Get base extension word
63 * __riscv_isa_extension_available() - Check whether given extension
89 return -EPROBE_DEFER; in riscv_ext_f_depends()
96 pr_err("Zicbom detected in ISA string, disabling as no cbom-block-size found\n"); in riscv_ext_zicbom_validate()
97 return -EINVAL; in riscv_ext_zicbom_validate()
100 pr_err("Zicbom disabled as cbom-block-size present, but is not a power-of-2\n"); in riscv_ext_zicbom_validate()
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H A Dsys_hwprobe.c1 // SPDX-License-Identifier: GPL-2.0-only
4 * are supported by the hardware. See Documentation/arch/riscv/hwprobe.rst for
30 u64 id = -1ULL; in hwprobe_arch_id()
34 if (pair->key != RISCV_HWPROBE_KEY_MVENDORID && in hwprobe_arch_id()
35 pair->key != RISCV_HWPROBE_KEY_MIMPID && in hwprobe_arch_id()
36 pair->key != RISCV_HWPROBE_KEY_MARCHID) in hwprobe_arch_id()
42 switch (pair->key) { in hwprobe_arch_id()
60 * If there's a mismatch for the given set, return -1 in the in hwprobe_arch_id()
64 id = -1ULL; in hwprobe_arch_id()
70 pair->value = id; in hwprobe_arch_id()
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