| commit | bd4fb6d270bc423a9a4098108784f7f9254c4e6d | [log] [tgz] |
|---|---|---|
| author | Will Deacon <will.deacon@arm.com> | Thu Jun 14 11:21:34 2018 +0100 |
| committer | Will Deacon <will.deacon@arm.com> | Thu Dec 06 16:47:04 2018 +0000 |
| tree | b795cee624fd00a3274c5d6efd89df71288cf1ff | |
| parent | 0b587c84e42151fc5a636c7cebf7b03b281dc672 [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>