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Commit c80aba80 authored by Suzuki K Poulose's avatar Suzuki K Poulose Committed by Will Deacon
Browse files

arm64: Add helpers for detecting AArch32 support at EL0 



Adds a helper to extract the support for AArch32 at EL0

Tested-by: default avatarYury Norov <ynorov@caviumnetworks.com>
Signed-off-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 75283501

arch/arm64/include/asm/cpufeature.h

+7 −0
Original line number Diff line number Diff line
@@ -170,6 +170,13 @@ static inline bool id_aa64mmfr0_mixed_endian_el0(u64 mmfr0) 
		cpuid_feature_extract_unsigned_field(mmfr0, ID_AA64MMFR0_BIGENDEL0_SHIFT) == 0x1;

}



static inline bool id_aa64pfr0_32bit_el0(u64 pfr0)

{

	u32 val = cpuid_feature_extract_unsigned_field(pfr0, ID_AA64PFR0_EL0_SHIFT);



	return val == ID_AA64PFR0_EL0_32BIT_64BIT;

}



void __init setup_cpu_features(void);



void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps,

arch/arm64/include/asm/sysreg.h

+1 −0
Original line number Diff line number Diff line
@@ -115,6 +115,7 @@ 
#define ID_AA64PFR0_ASIMD_SUPPORTED	0x0

#define ID_AA64PFR0_EL1_64BIT_ONLY	0x1

#define ID_AA64PFR0_EL0_64BIT_ONLY	0x1

#define ID_AA64PFR0_EL0_32BIT_64BIT	0x2



/* id_aa64mmfr0 */

#define ID_AA64MMFR0_TGRAN4_SHIFT	28