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-rw-r--r--arch/arm64/include/asm/assembler.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index 1241fb211293..3c78835bba94 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -436,6 +436,27 @@ alternative_endif
.endm
/*
+ * Macro to perform an instruction cache maintenance for the interval
+ * [start, end)
+ *
+ * start, end: virtual addresses describing the region
+ * label: A label to branch to on user fault.
+ * Corrupts: tmp1, tmp2
+ */
+ .macro invalidate_icache_by_line start, end, tmp1, tmp2, label
+ icache_line_size \tmp1, \tmp2
+ sub \tmp2, \tmp1, #1
+ bic \tmp2, \start, \tmp2
+9997:
+USER(\label, ic ivau, \tmp2) // invalidate I line PoU
+ add \tmp2, \tmp2, \tmp1
+ cmp \tmp2, \end
+ b.lo 9997b
+ dsb ish
+ isb
+ .endm
+
+/*
* reset_pmuserenr_el0 - reset PMUSERENR_EL0 if PMUv3 present
*/
.macro reset_pmuserenr_el0, tmpreg