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| author | Matthew Wilcox <mawilcox@microsoft.com> | 2017-09-08 16:14:00 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-08 18:26:48 -0700 |
| commit | fd1d362600e2d2edb6262d8e05661424c1a315bf (patch) | |
| tree | a7386f39d0c7ba19711542ad74c55681842add70 /arch/arm/lib | |
| parent | 4c51248533adcfb01ba704ce5993ecbad5cc4c99 (diff) | |
| download | lwn-fd1d362600e2d2edb6262d8e05661424c1a315bf.tar.gz lwn-fd1d362600e2d2edb6262d8e05661424c1a315bf.zip | |
ARM: implement memset32 & memset64
Reuse the existing optimised memset implementation to implement an
optimised memset32 and memset64.
Link: http://lkml.kernel.org/r/20170720184539.31609-5-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Reviewed-by: Russell King <rmk+kernel@armlinux.org.uk>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: David Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm/lib')
| -rw-r--r-- | arch/arm/lib/memset.S | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/arch/arm/lib/memset.S b/arch/arm/lib/memset.S index 3c65e3bd790f..ed6d35d9cdb5 100644 --- a/arch/arm/lib/memset.S +++ b/arch/arm/lib/memset.S @@ -28,7 +28,7 @@ UNWIND( .fnstart ) 1: orr r1, r1, r1, lsl #8 orr r1, r1, r1, lsl #16 mov r3, r1 - cmp r2, #16 +7: cmp r2, #16 blt 4f #if ! CALGN(1)+0 @@ -41,7 +41,7 @@ UNWIND( .fnend ) UNWIND( .fnstart ) UNWIND( .save {r8, lr} ) mov r8, r1 - mov lr, r1 + mov lr, r3 2: subs r2, r2, #64 stmgeia ip!, {r1, r3, r8, lr} @ 64 bytes at a time. @@ -73,11 +73,11 @@ UNWIND( .fnend ) UNWIND( .fnstart ) UNWIND( .save {r4-r8, lr} ) mov r4, r1 - mov r5, r1 + mov r5, r3 mov r6, r1 - mov r7, r1 + mov r7, r3 mov r8, r1 - mov lr, r1 + mov lr, r3 cmp r2, #96 tstgt ip, #31 @@ -114,7 +114,7 @@ UNWIND( .fnstart ) tst r2, #4 strne r1, [ip], #4 /* - * When we get here, we've got less than 4 bytes to zero. We + * When we get here, we've got less than 4 bytes to set. We * may have an unaligned pointer as well. */ 5: tst r2, #2 @@ -135,3 +135,15 @@ UNWIND( .fnstart ) UNWIND( .fnend ) ENDPROC(memset) ENDPROC(mmioset) + +ENTRY(__memset32) +UNWIND( .fnstart ) + mov r3, r1 @ copy r1 to r3 and fall into memset64 +UNWIND( .fnend ) +ENDPROC(__memset32) +ENTRY(__memset64) +UNWIND( .fnstart ) + mov ip, r0 @ preserve r0 as return value + b 7b @ jump into the middle of memset +UNWIND( .fnend ) +ENDPROC(__memset64) |