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Commit bf500618 authored by Suzuki K Poulose's avatar Suzuki K Poulose Committed by Catalin Marinas
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arm64: Add support for Half precision floating point 

ARMv8.2 extensions [1] include an optional feature, which supports
half precision(16bit) floating point/asimd data processing
instructions. This patch adds support for detecting and exposing
the same to the userspace via HWCAPs

[1] https://community.arm.com/groups/processors/blog/2016/01/05/armv8-a-architecture-evolution



Signed-off-by: default avatarSuzuki K. Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 3eca86e7

arch/arm64/include/uapi/asm/hwcap.h

+2 −0
Original line number Diff line number Diff line
@@ -28,5 +28,7 @@ 
#define HWCAP_SHA2		(1 << 6)

#define HWCAP_CRC32		(1 << 7)

#define HWCAP_ATOMICS		(1 << 8)

#define HWCAP_FPHP		(1 << 9)

#define HWCAP_ASIMDHP		(1 << 10)



#endif /* _UAPI__ASM_HWCAP_H */

arch/arm64/kernel/cpufeature.c

+2 −0
Original line number Diff line number Diff line
@@ -737,7 +737,9 @@ static const struct arm64_cpu_capabilities arm64_hwcaps[] = { 
	HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_CRC32_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, HWCAP_CRC32),

	HWCAP_CAP(SYS_ID_AA64ISAR0_EL1, ID_AA64ISAR0_ATOMICS_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, HWCAP_ATOMICS),

	HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, FTR_SIGNED, 0, CAP_HWCAP, HWCAP_FP),

	HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_FP_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, HWCAP_FPHP),

	HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, FTR_SIGNED, 0, CAP_HWCAP, HWCAP_ASIMD),

	HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, HWCAP_ASIMDHP),

#ifdef CONFIG_COMPAT

	HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, FTR_UNSIGNED, 2, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_PMULL),

	HWCAP_CAP(SYS_ID_ISAR5_EL1, ID_ISAR5_AES_SHIFT, FTR_UNSIGNED, 1, CAP_COMPAT_HWCAP2, COMPAT_HWCAP2_AES),

arch/arm64/kernel/cpuinfo.c

+2 −0
Original line number Diff line number Diff line
@@ -59,6 +59,8 @@ static const char *const hwcap_str[] = { 
	"sha2",

	"crc32",

	"atomics",

	"fphp",

	"asimdhp",

	NULL

};