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| author | Amit Daniel Kachhap <amit.kachhap@arm.com> | 2022-11-17 06:28:22 +0100 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-11-28 11:57:32 +0000 |
| commit | c00a19c8b143db31d660ee965e6a6f782ef090ff (patch) | |
| tree | a86521291809833382af989671c895bd85b6c3a6 | |
| parent | 74c344e6f153dd9ae97c99ad751723e4030d4af9 (diff) | |
| download | linux-c00a19c8b143db31d660ee965e6a6f782ef090ff.tar.bz2 | |
ARM: 9268/1: vfp: Add hwcap FPHP and ASIMDHP for FEAT_FP16
Floating point half-precision (FPHP) and Advanced SIMD half-precision
(ASIMDHP) are VFP features (FEAT_FP16) represented by MVFR1 identification register. These capabilities can optionally exist with VFPv3 and mandatory with VFPv4. Both these new features exist for Armv8 architecture in AArch32 state.
These hwcaps may be useful for the userspace to add conditional check
before trying to use FEAT_FP16 feature specific 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>
| -rw-r--r-- | arch/arm/include/asm/vfp.h | 6 | ||||
| -rw-r--r-- | arch/arm/include/uapi/asm/hwcap.h | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/setup.c | 2 | ||||
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 4 |
4 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/include/asm/vfp.h b/arch/arm/include/asm/vfp.h index 19928bfb4f9c..157ea3426158 100644 --- a/arch/arm/include/asm/vfp.h +++ b/arch/arm/include/asm/vfp.h @@ -87,6 +87,12 @@ #define MVFR0_DP_BIT (8) #define MVFR0_DP_MASK (0xf << MVFR0_DP_BIT) +/* MVFR1 bits */ +#define MVFR1_ASIMDHP_BIT (20) +#define MVFR1_ASIMDHP_MASK (0xf << MVFR1_ASIMDHP_BIT) +#define MVFR1_FPHP_BIT (24) +#define MVFR1_FPHP_MASK (0xf << MVFR1_FPHP_BIT) + /* Bit patterns for decoding the packaged operation descriptors */ #define VFPOPDESC_LENGTH_BIT (9) #define VFPOPDESC_LENGTH_MASK (0x07 << VFPOPDESC_LENGTH_BIT) diff --git a/arch/arm/include/uapi/asm/hwcap.h b/arch/arm/include/uapi/asm/hwcap.h index 990199d8b7c6..8b6f690f0ac4 100644 --- a/arch/arm/include/uapi/asm/hwcap.h +++ b/arch/arm/include/uapi/asm/hwcap.h @@ -28,6 +28,8 @@ #define HWCAP_IDIV (HWCAP_IDIVA | HWCAP_IDIVT) #define HWCAP_LPAE (1 << 20) #define HWCAP_EVTSTRM (1 << 21) +#define HWCAP_FPHP (1 << 22) +#define HWCAP_ASIMDHP (1 << 23) /* * HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2 diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 1e8a50a97edf..870e5d5c5b5b 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -1249,6 +1249,8 @@ static const char *hwcap_str[] = { "vfpd32", "lpae", "evtstrm", + "fphp", + "asimdhp", NULL }; diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 2cb355c1b5b7..55dcd96c7e3b 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -831,6 +831,10 @@ static int __init vfp_init(void) if ((fmrx(MVFR1) & 0xf0000000) == 0x10000000) elf_hwcap |= HWCAP_VFPv4; + if (((fmrx(MVFR1) & MVFR1_ASIMDHP_MASK) >> MVFR1_ASIMDHP_BIT) == 0x2) + elf_hwcap |= HWCAP_ASIMDHP; + if (((fmrx(MVFR1) & MVFR1_FPHP_MASK) >> MVFR1_FPHP_BIT) == 0x3) + elf_hwcap |= HWCAP_FPHP; } /* Extract the architecture version on pre-cpuid scheme */ } else { |