summaryrefslogtreecommitdiffstats
path: root/arch/arm64/include/asm/cpufeature.h
diff options
context:
space:
mode:
authorMarc Zyngier <marc.zyngier@arm.com>2016-04-22 12:25:32 +0100
committerWill Deacon <will.deacon@arm.com>2016-04-25 15:13:05 +0100
commite3661b128e53ee281e1e7c589a5b647890bd6d7c (patch)
tree456828adc71dc6cc53861c704a55ce425805db83 /arch/arm64/include/asm/cpufeature.h
parent92406f0cc9e3d5cc77bf3de6d68c9c2373dcd701 (diff)
downloadop-kernel-dev-e3661b128e53ee281e1e7c589a5b647890bd6d7c.zip
op-kernel-dev-e3661b128e53ee281e1e7c589a5b647890bd6d7c.tar.gz
arm64: Allow a capability to be checked on a single CPU
Now that the capabilities are only available once all the CPUs have booted, we're unable to check for a particular feature in any subsystem that gets initialized before then. In order to support this, introduce a local_cpu_has_cap() function that tests for the presence of a given capability independently of the whole framework. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> [ Added preemptible() check ] Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> [will: remove duplicate initialisation of caps in this_cpu_has_cap] Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cpufeature.h')
-rw-r--r--arch/arm64/include/asm/cpufeature.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index e501e4a..d39db63 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -109,6 +109,8 @@ struct arm64_cpu_capabilities {
extern DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS);
+bool this_cpu_has_cap(unsigned int cap);
+
static inline bool cpu_have_feature(unsigned int num)
{
return elf_hwcap & (1UL << num);
OpenPOWER on IntegriCloud