Messages in this thread | | | Date | Fri, 04 Sep 2015 13:00:10 +0100 | From | "Suzuki K. Poulose" <> | Subject | Re: [PATCH 1/3] arm64/cpufeature.h: Add macros for a cpu features testing |
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On 03/09/15 19:11, Alexander Kuleshov wrote: > This patch provides a couple of macros for the testing of processor > features (crypto and FP/SIMD) like support of SHA1, AES instructions, > support for FPU and etc. There is already a couple of places in the > arch/arm64/kernel where these processor features are tested and these > macros are facilitate this. > > Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com> > --- > arch/arm64/include/asm/cpufeature.h | 44 +++++++++++++++++++++++++++++++++++++ > 1 file changed, 44 insertions(+) > > diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h > index c104421..2919455 100644 > --- a/arch/arm64/include/asm/cpufeature.h > +++ b/arch/arm64/include/asm/cpufeature.h > @@ -28,7 +28,50 @@ > > #define ARM64_NCAPS 4 > > +/* > + * ID_AA64ISAR0_EL1 AES, bits [7:4] > + */ > +#define ID_AA64ISAR0_EL1_AES_MASK 4 > +#define ID_AA64ISAR0_EL1_AES(feature) \ > + (((feature >> ID_AA64ISAR0_EL1_AES_MASK) & 0xf) & 1UL) > +#define ID_AA64ISAR0_EL1_PMULL(feature) \ > + (((feature >> ID_AA64ISAR0_EL1_AES_MASK) & 0xf) & 2UL) > +
There is generic CPUID feature helper queued for 4.3, which can extract the feature bits
cpuid_feature_extract_field(feature, shift)
You might want to use it instead. Btw, I have a patch series(waiting for the merge window, before I post), which changes the way we initialise the HWCAP bits.
Thanks Suzuki
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