Messages in this thread Patch in this message | | | From | Greentime Hu <> | Subject | [PATCH 04/13] riscv: Extending cpufeature.c to detect V-extension | Date | Fri, 12 Jun 2020 15:09:53 +0800 |
| |
From: Guo Ren <guoren@linux.alibaba.com>
From: Guo Ren <ren_guo@c-sky.com>
Current cpufeature.c doesn't support detecting V-extension, because "rv64" also contain a 'v' letter and we need to skip it.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Reviewed-by: Anup Patel <anup@brainfault.org> --- arch/riscv/include/uapi/asm/hwcap.h | 1 + arch/riscv/kernel/cpufeature.c | 4 +++- 2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/include/uapi/asm/hwcap.h b/arch/riscv/include/uapi/asm/hwcap.h index dee98ee28318..a913e9a38819 100644 --- a/arch/riscv/include/uapi/asm/hwcap.h +++ b/arch/riscv/include/uapi/asm/hwcap.h @@ -21,5 +21,6 @@ #define COMPAT_HWCAP_ISA_F (1 << ('F' - 'A')) #define COMPAT_HWCAP_ISA_D (1 << ('D' - 'A')) #define COMPAT_HWCAP_ISA_C (1 << ('C' - 'A')) +#define COMPAT_HWCAP_ISA_V (1 << ('V' - 'A')) #endif /* _UAPI_ASM_RISCV_HWCAP_H */ diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index a5ad00043104..c8527d770c98 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -30,6 +30,7 @@ void riscv_fill_hwcap(void) isa2hwcap['f'] = isa2hwcap['F'] = COMPAT_HWCAP_ISA_F; isa2hwcap['d'] = isa2hwcap['D'] = COMPAT_HWCAP_ISA_D; isa2hwcap['c'] = isa2hwcap['C'] = COMPAT_HWCAP_ISA_C; + isa2hwcap['v'] = isa2hwcap['V'] = COMPAT_HWCAP_ISA_V; elf_hwcap = 0; @@ -44,7 +45,8 @@ void riscv_fill_hwcap(void) continue; } - for (i = 0; i < strlen(isa); ++i) + /* Skip rv64/rv32 to support v/V:vector */ + for (i = 4; i < strlen(isa); ++i) this_hwcap |= isa2hwcap[(unsigned char)(isa[i])]; /* -- 2.27.0
| |