diff options
| author | Geoff Levand <geoff@infradead.org> | 2016-04-27 17:47:10 +0100 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2016-11-10 15:54:54 +0800 |
| commit | 5249f3c1e453fc3a1661976e94500da09f2cdcf1 (patch) | |
| tree | 4bfb300e6aa98b95523b59815e6e8e3ca16cce82 /arch | |
| parent | 5a13294e6edc1ab1816a0c8e7fa5b930d33871da (diff) | |
arm64: Add new asm macro copy_page
Kexec and hibernate need to copy pages of memory, but may not have all
of the kernel mapped, and are unable to call copy_page().
Add a simplistic copy_page() macro, that can be inlined in these
situations. lib/copy_page.S provides a bigger better version, but
uses more registers.
Signed-off-by: Geoff Levand <geoff@infradead.org>
[Changed asm label to 9998, added commit message]
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from commit 5003dbde45961dd7ab3d8a09ab9ad8bcb604db40)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/assembler.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index 55fab0a827d9..3c6d0df4b6bb 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -24,6 +24,7 @@ #define __ASM_ASSEMBLER_H #include <asm/asm-offsets.h> +#include <asm/page.h> #include <asm/pgtable-hwdef.h> #include <asm/ptrace.h> #include <asm/thread_info.h> @@ -274,6 +275,24 @@ lr .req x30 // link register .endm /* + * copy_page - copy src to dest using temp registers t1-t8 + */ + .macro copy_page dest:req src:req t1:req t2:req t3:req t4:req t5:req t6:req t7:req t8:req +9998: ldp \t1, \t2, [\src] + ldp \t3, \t4, [\src, #16] + ldp \t5, \t6, [\src, #32] + ldp \t7, \t8, [\src, #48] + add \src, \src, #64 + stnp \t1, \t2, [\dest] + stnp \t3, \t4, [\dest, #16] + stnp \t5, \t6, [\dest, #32] + stnp \t7, \t8, [\dest, #48] + add \dest, \dest, #64 + tst \src, #(PAGE_SIZE - 1) + b.ne 9998b + .endm + +/* * Annotate a function as position independent, i.e., safe to be called before * the kernel virtual mapping is activated. */ |