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authorWill Deacon <will.deacon@arm.com>2016-09-06 16:40:23 +0100
committerWill Deacon <will.deacon@arm.com>2016-09-09 18:12:28 +0100
commitf99a250cb6a3b301b101b4c0f5fcb80593bba6dc (patch)
treef22f51a75b8215b43807ba2186ec8f9e0a9d5827 /arch/arm64/include/asm/assembler.h
parent8a71f0c656e0521867931eecff54eb3a35ca65a7 (diff)
arm64: barriers: introduce nops and __nops macros for NOP sequences
NOP sequences tend to get used for padding out alternative sections and uarch-specific pipeline flushes in errata workarounds. This patch adds macros for generating these sequences as both inline asm blocks, but also as strings suitable for embedding in other asm blocks directly. Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/assembler.h')
-rw-r--r--arch/arm64/include/asm/assembler.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index f09a5ae48a44..28bfe6132eb6 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -87,6 +87,15 @@
.endm
/*
+ * NOP sequence
+ */
+ .macro nops, num
+ .rept \num
+ nop
+ .endr
+ .endm
+
+/*
* Emit an entry into the exception table
*/
.macro _asm_extable, from, to