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| author | Will Deacon <will.deacon@arm.com> | 2018-02-05 15:34:16 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-02-06 22:53:28 +0000 |
| commit | 669474e772b952b14f4de4845a1558fd4c0414a4 (patch) | |
| tree | 95e11d01c1c6eb07b25fbc271dc90222718a3c8e /arch/arm64/include/asm/assembler.h | |
| parent | 439e70e27a51fe374806f460848066b237b0c10b (diff) | |
| download | linux-669474e772b952b14f4de4845a1558fd4c0414a4.tar.bz2 | |
arm64: barrier: Add CSDB macros to control data-value prediction
For CPUs capable of data value prediction, CSDB waits for any outstanding
predictions to architecturally resolve before allowing speculative execution
to continue. Provide macros to expose it to the arch code.
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/assembler.h')
| -rw-r--r-- | arch/arm64/include/asm/assembler.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index 544878a9f29e..1f44b4255a28 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -116,6 +116,13 @@ .endm /* + * Value prediction barrier + */ + .macro csdb + hint #20 + .endm + +/* * NOP sequence */ .macro nops, num |