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arm64: HWCAP: encapsulate elf_hwcap

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The introduction of AT_HWCAP2 introduced accessors which ensure that
hwcap features are set and tested appropriately.

Let's now mandate access to elf_hwcap via these accessors by making
elf_hwcap static within cpufeature.c.

Signed-off-by: Andrew Murray <andrew.murray@arm.com>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Andrew Murray
2019-04-09 10:52:41 +01:00
committed by Will Deacon
parent aaba098fe6
commit aec0bff757
3 changed files with 38 additions and 17 deletions
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15
arch/arm64/include/asm/cpufeature.h
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@@ -392,19 +392,12 @@ extern DECLARE_BITMAP(boot_capabilities, ARM64_NPATCHABLE);
for_each_set_bit(cap, cpu_hwcaps, ARM64_NCAPS)
bool this_cpu_has_cap(unsigned int cap);
void cpu_set_feature(unsigned int num);
bool cpu_have_feature(unsigned int num);
unsigned long cpu_get_elf_hwcap(void);
unsigned long cpu_get_elf_hwcap2(void);
static inline void cpu_set_feature(unsigned int num)
{
WARN_ON(num >= MAX_CPU_FEATURES);
elf_hwcap |= BIT(num);
}
#define cpu_set_named_feature(name) cpu_set_feature(cpu_feature(name))
static inline bool cpu_have_feature(unsigned int num)
{
WARN_ON(num >= MAX_CPU_FEATURES);
return elf_hwcap & BIT(num);
}
#define cpu_have_named_feature(name) cpu_have_feature(cpu_feature(name))
/* System capability check for constant caps */