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| author | Amit Daniel Kachhap <amit.kachhap@arm.com> | 2022-11-17 06:37:21 +0100 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-11-28 12:57:33 +0100 |
| commit | ce4835497c20991574fde492ab37ec666563d3e4 (patch) | |
| tree | fc5b68f7321f1e1b76bcf147275fe343ea2318e2 /arch/arm/vfp | |
| parent | ARM: 9269/1: vfp: Add hwcap for FEAT_DotProd (diff) | |
| download | linux-ce4835497c20991574fde492ab37ec666563d3e4.tar.xz linux-ce4835497c20991574fde492ab37ec666563d3e4.zip | |
ARM: 9270/1: vfp: Add hwcap for FEAT_FHM
Floating-point half-precision multiplication (FHM) is a feature present
in AArch32 state for Armv8 and is represented by ISAR6.FHM identification register.
This feature denotes the presence of VFMAL and VMFSL instructions and
hence adding a hwcap will enable the userspace to check it before
trying to use those instructions.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/vfp')
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 70f1e0f4eece..404c4f901132 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -845,6 +845,12 @@ static int __init vfp_init(void) isar6 = read_cpuid_ext(CPUID_EXT_ISAR6); if (cpuid_feature_extract_field(isar6, 4) == 0x1) elf_hwcap |= HWCAP_ASIMDDP; + /* + * Check for the presence of Advanced SIMD Floating point + * half-precision multiplication instructions. + */ + if (cpuid_feature_extract_field(isar6, 8) == 0x1) + elf_hwcap |= HWCAP_ASIMDFHM; /* Extract the architecture version on pre-cpuid scheme */ } else { |