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author	Will Deacon <will.deacon@arm.com>
	Thu, 14 Jun 2018 10:21:34 +0000 (11:21 +0100)
committer	Will Deacon <will.deacon@arm.com>
	Thu, 6 Dec 2018 16:47:04 +0000 (16:47 +0000)
commit	bd4fb6d270bc423a9a4098108784f7f9254c4e6d
tree	b795cee624fd00a3274c5d6efd89df71288cf1ff	tree \| snapshot
parent	0b587c84e42151fc5a636c7cebf7b03b281dc672	commit \| diff

arm64: Add support for SB barrier and patch in over DSB; ISB sequences

We currently use a DSB; ISB sequence to inhibit speculation in set_fs().
Whilst this works for current CPUs, future CPUs may implement a new SB
barrier instruction which acts as an architected speculation barrier.

On CPUs that support it, patch in an SB; NOP sequence over the DSB; ISB
sequence and advertise the presence of the new instruction to userspace.

Signed-off-by: Will Deacon <will.deacon@arm.com>

John Crispins staging tree

RSS Atom

arch/arm64/include/asm/assembler.h		diff \| blob \| history
arch/arm64/include/asm/barrier.h		diff \| blob \| history
arch/arm64/include/asm/cpucaps.h		diff \| blob \| history
arch/arm64/include/asm/sysreg.h		diff \| blob \| history
arch/arm64/include/asm/uaccess.h		diff \| blob \| history
arch/arm64/include/uapi/asm/hwcap.h		diff \| blob \| history
arch/arm64/kernel/cpufeature.c		diff \| blob \| history
arch/arm64/kernel/cpuinfo.c		diff \| blob \| history