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MIPS: Add crc instruction support flag to elf_hwcap

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Indicate that CRC32 and CRC32C instuctions are supported by the CPU
through elf_hwcap flags.

This will be used by a follow-up commit that introduces crc32(c) crypto
acceleration modules and is required by GENERIC_CPU_AUTOPROBE feature.

Signed-off-by: Marcin Nowakowski <marcin.nowakowski@mips.com>
Signed-off-by: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18600/
This commit is contained in:
Marcin Nowakowski 2018-02-09 22:11:05 +00:00 committed by James Hogan
parent ab3d844129
commit 256211f2b0
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3 changed files with 5 additions and 0 deletions
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1
arch/mips/include/asm/mipsregs.h
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@ -664,6 +664,7 @@
#define MIPS_CONF5_FRE (_ULCAST_(1) << 8) #define MIPS_CONF5_FRE (_ULCAST_(1) << 8)
#define MIPS_CONF5_UFE (_ULCAST_(1) << 9) #define MIPS_CONF5_UFE (_ULCAST_(1) << 9)
#define MIPS_CONF5_CA2 (_ULCAST_(1) << 14) #define MIPS_CONF5_CA2 (_ULCAST_(1) << 14)
#define MIPS_CONF5_CRCP (_ULCAST_(1) << 18)
#define MIPS_CONF5_MSAEN (_ULCAST_(1) << 27) #define MIPS_CONF5_MSAEN (_ULCAST_(1) << 27)
#define MIPS_CONF5_EVA (_ULCAST_(1) << 28) #define MIPS_CONF5_EVA (_ULCAST_(1) << 28)
#define MIPS_CONF5_CV (_ULCAST_(1) << 29) #define MIPS_CONF5_CV (_ULCAST_(1) << 29)

1
arch/mips/include/uapi/asm/hwcap.h
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@ -5,5 +5,6 @@
/* HWCAP flags */ /* HWCAP flags */
#define HWCAP_MIPS_R6 (1 << 0) #define HWCAP_MIPS_R6 (1 << 0)
#define HWCAP_MIPS_MSA (1 << 1) #define HWCAP_MIPS_MSA (1 << 1)
#define HWCAP_MIPS_CRC32 (1 << 2)
#endif /* _UAPI_ASM_HWCAP_H */ #endif /* _UAPI_ASM_HWCAP_H */

3
arch/mips/kernel/cpu-probe.c
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@ -848,6 +848,9 @@ static inline unsigned int decode_config5(struct cpuinfo_mips *c)
if (config5 & MIPS_CONF5_CA2) if (config5 & MIPS_CONF5_CA2)
c->ases |= MIPS_ASE_MIPS16E2; c->ases |= MIPS_ASE_MIPS16E2;
if (config5 & MIPS_CONF5_CRCP)
elf_hwcap |= HWCAP_MIPS_CRC32;
return config5 & MIPS_CONF_M; return config5 & MIPS_CONF_M;
} }