diff options
| author |   Will Deacon <will.deacon@arm.com> | 2018-06-14 11:21:34 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-12-06 16:47:04 +0000 |
| commit | bd4fb6d270bc423a9a4098108784f7f9254c4e6d (patch) | |
| tree | b795cee624fd00a3274c5d6efd89df71288cf1ff /arch/arm64/include/asm/cpucaps.h | |
| parent | arm64: capabilities: Batch cpu_enable callbacks (diff) | |
| download | linux-dev-bd4fb6d270bc423a9a4098108784f7f9254c4e6d.tar.xz linux-dev-bd4fb6d270bc423a9a4098108784f7f9254c4e6d.zip | |
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>
Diffstat (limited to 'arch/arm64/include/asm/cpucaps.h')
| -rw-r--r-- | arch/arm64/include/asm/cpucaps.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h index 6e2d254c09eb..b7f0709a21af 100644 --- a/arch/arm64/include/asm/cpucaps.h +++ b/arch/arm64/include/asm/cpucaps.h @@ -54,7 +54,8 @@ #define ARM64_HAS_CRC32 33 #define ARM64_SSBS 34 #define ARM64_WORKAROUND_1188873 35 +#define ARM64_HAS_SB 36 -#define ARM64_NCAPS 36 +#define ARM64_NCAPS 37 #endif /* __ASM_CPUCAPS_H */ |