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Commit b3f15378 authored by Suzuki K. Poulose's avatar Suzuki K. Poulose Committed by Catalin Marinas
Browse files

arm64: Read system wide CPUID value 



Add an API for reading the safe CPUID value across the
system from the new infrastructure.

Signed-off-by: default avatarSuzuki K. Poulose <suzuki.poulose@arm.com>
Tested-by: default avatarDave Martin <Dave.Martin@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 3086d391

arch/arm64/include/asm/cpufeature.h

+2 −0
Original line number Diff line number Diff line
@@ -144,6 +144,8 @@ void check_local_cpu_features(void); 
bool cpu_supports_mixed_endian_el0(void);

bool system_supports_mixed_endian_el0(void);



u64 read_system_reg(u32 id);



#endif /* __ASSEMBLY__ */



#endif

arch/arm64/kernel/cpufeature.c

+9 −0
Original line number Diff line number Diff line
@@ -590,6 +590,15 @@ void update_cpu_features(int cpu, 
	update_mixed_endian_el0_support(info);

}



u64 read_system_reg(u32 id)

{

	struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id);



	/* We shouldn't get a request for an unsupported register */

	BUG_ON(!regp);

	return regp->sys_val;

}



static bool

feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry)

{