[PATCH] Report support for optional ARMv8.2 half-precision floating point extension

george pee
2022-09-01T14:13:19Z

Report as fphp to be consistent with arm64

Signed-off-by: george pee <georgepee@gmail.com>
---
arch/arm/include/uapi/asm/hwcap.h | 1 +
arch/arm/kernel/setup.c | 1 +
arch/arm/vfp/vfpmodule.c | 2 ++
3 files changed, 4 insertions(+)

diff --git a/arch/arm/include/uapi/asm/hwcap.h b/arch/arm/include/uapi/asm/hwcap.h
index 990199d8b7c6..f975845ce5d3 100644
--- a/arch/arm/include/uapi/asm/hwcap.h
+++ b/arch/arm/include/uapi/asm/hwcap.h
@@ -28,6 +28,7 @@
#define HWCAP_IDIV (HWCAP_IDIVA | HWCAP_IDIVT)
#define HWCAP_LPAE (1 << 20)
#define HWCAP_EVTSTRM (1 << 21)
+#define HWCAP_FPHP (1 << 22)

/*
* 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..6694ced0552a 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -1249,6 +1249,7 @@ static const char *hwcap_str[] = {
"vfpd32",
"lpae",
"evtstrm",
+ "fphp",
NULL
};

diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 2cb355c1b5b7..cef8c64ce8bd 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -831,6 +831,8 @@ static int __init vfp_init(void)

if ((fmrx(MVFR1) & 0xf0000000) == 0x10000000)
elf_hwcap |= HWCAP_VFPv4;
+ if ((fmrx(MVFR1) & 0x0f000000) == 0x03000000)
+ elf_hwcap |= HWCAP_FPHP;
}
/* Extract the architecture version on pre-cpuid scheme */
} else {
--
2.37.3