From: george pee <georgepee@gmail.com>
To: unlisted-recipients:; (no To-header on input)
Cc: george pee <georgepee@gmail.com>,
Russell King <linux@armlinux.org.uk>,
Ard Biesheuvel <ardb@kernel.org>,
"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
Linus Walleij <linus.walleij@linaro.org>,
Nicolas Pitre <nico@fluxnic.net>,
Keith Packard <keithpac@amazon.com>,
Austin Kim <austindh.kim@gmail.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2] ARM : Support for optional ARMv8.2 half-precision floating point extension
Date: Mon, 12 Sep 2022 08:24:58 -0500 [thread overview]
Message-ID: <20220912132501.1812575-1-georgepee@gmail.com> (raw)
Report feature /proc/cpuinfo 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/entry-armv.S | 3 ++-
arch/arm/kernel/setup.c | 1 +
arch/arm/vfp/vfpmodule.c | 2 ++
4 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm/include/uapi/asm/hwcap.h b/arch/arm/include/uapi/asm/hwcap.h
index 990199d8b7c6..5d635dce8853 100644
--- a/arch/arm/include/uapi/asm/hwcap.h
+++ b/arch/arm/include/uapi/asm/hwcap.h
@@ -37,5 +37,6 @@
#define HWCAP2_SHA1 (1 << 2)
#define HWCAP2_SHA2 (1 << 3)
#define HWCAP2_CRC32 (1 << 4)
+#define HWCAP2_FPHP (1 << 5)
#endif /* _UAPI__ASMARM_HWCAP_H */
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index c39303e5c234..161f8df852e1 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -625,11 +625,12 @@ call_fpe:
ret.w lr @ CP#6
ret.w lr @ CP#7
ret.w lr @ CP#8
- ret.w lr @ CP#9
#ifdef CONFIG_VFP
+ W(b) do_vfp @ CP#9 (VFP/FP16)
W(b) do_vfp @ CP#10 (VFP)
W(b) do_vfp @ CP#11 (VFP)
#else
+ ret.w lr @ CP#9
ret.w lr @ CP#10 (VFP)
ret.w lr @ CP#11 (VFP)
#endif
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 1e8a50a97edf..8887d0f447d6 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -1258,6 +1258,7 @@ static const char *hwcap2_str[] = {
"sha1",
"sha2",
"crc32",
+ "fphp",
NULL
};
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 2cb355c1b5b7..0806b0b1f2c7 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_hwcap2 |= HWCAP2_FPHP;
}
/* Extract the architecture version on pre-cpuid scheme */
} else {
--
2.37.3
next reply other threads:[~2022-09-12 13:25 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-12 13:24 george pee [this message]
2022-11-03 13:40 ` George Pee
2022-11-03 16:18 ` Linus Walleij
2022-11-03 16:59 ` Mark Brown
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