ARM: 9273/1: Add hwcap for Speculation Barrier(SB)

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Speculation Barrier(FEAT_SB) is a feature present in AArch32 state for
Armv8 and is represented by ISAR6.SB identification register.

This feature denotes the presence of SB instruction and hence adding a
hwcap will enable the userspace to check it before trying to use this
instruction.

This commit adds the ID feature bit detection, and uses elf_hwcap2
accordingly.

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>

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Amit Daniel Kachhap 2022-11-17 07:05:19 +01:00 • committed by Russell King (Oracle)

parent 956ca3a4eb

commit 3bda6d8848

2 changed files with 9 additions and 0 deletions

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1

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

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8

arch/arm/kernel/setup.c

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