Int8 matrix multiplication (FEAT_AA32I8MM) is a feature present in AArch32 state for Armv8 and is represented by ISAR6.I8MM identification register.
This feature denotes the presence of VSMMLA, VSUDOT, VUMMLA, VUSMMLA and
VUSDOT 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>
#define HWCAP_ASIMDDP (1 << 24)
#define HWCAP_ASIMDFHM (1 << 25)
#define HWCAP_ASIMDBF16 (1 << 26)
+#define HWCAP_I8MM (1 << 27)
/*
* HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2
"asimddp",
"asimdfhm",
"asimdbf16",
+ "i8mm",
NULL
};
*/
if (cpuid_feature_extract_field(isar6, 20) == 0x1)
elf_hwcap |= HWCAP_ASIMDBF16;
+ /*
+ * Check for the presence of Advanced SIMD and floating point
+ * Int8 matrix multiplication instructions instructions.
+ */
+ if (cpuid_feature_extract_field(isar6, 24) == 0x1)
+ elf_hwcap |= HWCAP_I8MM;
/* Extract the architecture version on pre-cpuid scheme */
} else {