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| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-11-26 11:06:19 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-11-26 11:06:19 -0300 |
| commit | 2ea352d5960ad469f5712cf3e293db97beac4e01 (patch) | |
| tree | c24ae19073f2884867b310ee193d36a82075b60f /arch/arm64/include/asm/cpufeature.h | |
| parent | Merge branch 'x86/core' into perf/core, to resolve conflicts and to pick up completed topic tree (diff) | |
| parent | Merge tag 'for-linus-5.5-1' of git://github.com/cminyard/linux-ipmi (diff) | |
| download | linux-dev-2ea352d5960ad469f5712cf3e293db97beac4e01.tar.xz linux-dev-2ea352d5960ad469f5712cf3e293db97beac4e01.zip | |
Merge remote-tracking branch 'torvalds/master' into perf/core
To pick up BPF changes we'll need.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'arch/arm64/include/asm/cpufeature.h')
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 9cde5d2e768f..4261d55e8506 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -659,6 +659,20 @@ static inline u32 id_aa64mmfr0_parange_to_phys_shift(int parange) default: return CONFIG_ARM64_PA_BITS; } } + +/* Check whether hardware update of the Access flag is supported */ +static inline bool cpu_has_hw_af(void) +{ + u64 mmfr1; + + if (!IS_ENABLED(CONFIG_ARM64_HW_AFDBM)) + return false; + + mmfr1 = read_cpuid(ID_AA64MMFR1_EL1); + return cpuid_feature_extract_unsigned_field(mmfr1, + ID_AA64MMFR1_HADBS_SHIFT); +} + #endif /* __ASSEMBLY__ */ #endif |