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

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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>
This commit is contained in:
Will Deacon 2018-06-14 11:21:34 +01:00
commit bd4fb6d270
8 changed files with 40 additions and 3 deletions
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