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-rw-r--r--arch/arm64/lib/copy_page.S17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S
index 2534533..4c1e700 100644
--- a/arch/arm64/lib/copy_page.S
+++ b/arch/arm64/lib/copy_page.S
@@ -18,6 +18,8 @@
#include <linux/const.h>
#include <asm/assembler.h>
#include <asm/page.h>
+#include <asm/cpufeature.h>
+#include <asm/alternative.h>
/*
* Copy a page from src to dest (both are page aligned)
@@ -27,6 +29,15 @@
* x1 - src
*/
ENTRY(copy_page)
+alternative_if_not ARM64_HAS_NO_HW_PREFETCH
+ nop
+ nop
+alternative_else
+ # Prefetch two cache lines ahead.
+ prfm pldl1strm, [x1, #128]
+ prfm pldl1strm, [x1, #256]
+alternative_endif
+
ldp x2, x3, [x1]
ldp x4, x5, [x1, #16]
ldp x6, x7, [x1, #32]
@@ -41,6 +52,12 @@ ENTRY(copy_page)
1:
subs x18, x18, #128
+alternative_if_not ARM64_HAS_NO_HW_PREFETCH
+ nop
+alternative_else
+ prfm pldl1strm, [x1, #384]
+alternative_endif
+
stnp x2, x3, [x0]
ldp x2, x3, [x1]
stnp x4, x5, [x0, #16]
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