Commit 62ea0d87 authored by Amit Daniel Kachhap's avatar Amit Daniel Kachhap Committed by Russell King (Oracle)
Browse files

ARM: 9269/1: vfp: Add hwcap for FEAT_DotProd 



Advanced Dot product is a feature present in AArch32 state for Armv8 and
is represented by ISAR6 identification register.

This feature denotes the presence of UDOT and SDOT instructions and hence adding a hwcap will enable the userspace to check it before trying to use those instructions.

Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarAmit Daniel Kachhap <amit.kachhap@arm.com>
Signed-off-by: default avatarRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
parent c00a19c8

arch/arm/include/uapi/asm/hwcap.h

+1 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#define HWCAP_EVTSTRM	(1 << 21)

#define HWCAP_FPHP	(1 << 22)

#define HWCAP_ASIMDHP	(1 << 23)

#define HWCAP_ASIMDDP	(1 << 24)



/*

 * HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2

arch/arm/kernel/setup.c

+1 −0
Original line number Diff line number Diff line
@@ -1251,6 +1251,7 @@ static const char *hwcap_str[] = { 
	"evtstrm",

	"fphp",

	"asimdhp",

	"asimddp",

	NULL

};

arch/arm/vfp/vfpmodule.c

+10 −0
Original line number Diff line number Diff line
@@ -774,6 +774,7 @@ static int __init vfp_init(void) 
{

	unsigned int vfpsid;

	unsigned int cpu_arch = cpu_architecture();

	unsigned int isar6;



	/*

	 * Enable the access to the VFP on all online CPUs so the
@@ -836,6 +837,15 @@ static int __init vfp_init(void) 
			if (((fmrx(MVFR1) & MVFR1_FPHP_MASK) >> MVFR1_FPHP_BIT) == 0x3)

				elf_hwcap |= HWCAP_FPHP;

		}



		/*

		 * Check for the presence of Advanced SIMD Dot Product

		 * instructions.

		 */

		isar6 = read_cpuid_ext(CPUID_EXT_ISAR6);

		if (cpuid_feature_extract_field(isar6, 4) == 0x1)

			elf_hwcap |= HWCAP_ASIMDDP;



	/* Extract the architecture version on pre-cpuid scheme */

	} else {

		if (vfpsid & FPSID_NODOUBLE) {