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ARM: 9274/1: Add hwcap for Speculative Store Bypassing Safe

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Speculative Store Bypassing Safe(FEAT_SSBS) is a feature present in
AArch32 state for Armv8 and is represented by ID_PFR2_EL1.SSBS
identification register.

This feature denotes the presence of PSTATE.ssbs bit and hence adding a
hwcap will enable the userspace to check it before trying to set/unset
this PSTATE.

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>
This commit is contained in:
Amit Daniel Kachhap
2022-11-17 07:10:35 +01:00
committed by Russell King (Oracle)
parent 3bda6d8848
commit fea53546be
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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@@ -44,5 +44,6 @@
#define HWCAP2_SHA2 (1 << 3)
#define HWCAP2_CRC32 (1 << 4)
#define HWCAP2_SB (1 << 5)
#define HWCAP2_SSBS (1 << 6)
#endif /* _UAPI__ASMARM_HWCAP_H */