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| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2017-01-09 17:28:31 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-01-12 12:31:09 +0000 |
| commit | 77c97b4ee21290f5f083173d957843b615abbff2 (patch) | |
| tree | f808443f1cf7c95776dd62c4047b2257e98a3d96 /arch/arm64/include | |
| parent | fe4fbdbcddeaab58a4f9b5297f28b8a4babf6f1f (diff) | |
| download | linux-77c97b4ee21290f5f083173d957843b615abbff2.tar.gz linux-77c97b4ee21290f5f083173d957843b615abbff2.tar.xz | |
arm64: cpufeature: Expose CPUID registers by emulation
This patch adds the hook for emulating MRS instruction to
export the 'user visible' value of supported system registers.
We emulate only the following id space for system registers:
Op0=3, Op1=0, CRn=0, CRm=[0, 4-7]
The rest will fall back to SIGILL. This capability is also
advertised via a new HWCAP_CPUID.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
[will: add missing static keyword to enable_mrs_emulation]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/sysreg.h | 4 | ||||
| -rw-r--r-- | arch/arm64/include/uapi/asm/hwcap.h | 1 |
2 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index 36ae882e2dcc..ac24b6e798b1 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -265,6 +265,10 @@ #define ID_AA64MMFR0_TGRAN_SUPPORTED ID_AA64MMFR0_TGRAN64_SUPPORTED #endif + +/* Safe value for MPIDR_EL1: Bit31:RES1, Bit30:U:0, Bit24:MT:0 */ +#define SYS_MPIDR_SAFE_VAL (1UL << 31) + #ifdef __ASSEMBLY__ .irp num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30 diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h index a739287ef6a3..773c90b05458 100644 --- a/arch/arm64/include/uapi/asm/hwcap.h +++ b/arch/arm64/include/uapi/asm/hwcap.h @@ -30,5 +30,6 @@ #define HWCAP_ATOMICS (1 << 8) #define HWCAP_FPHP (1 << 9) #define HWCAP_ASIMDHP (1 << 10) +#define HWCAP_CPUID (1 << 11) #endif /* _UAPI__ASM_HWCAP_H */ |