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ARM: implement memset32 & memset64

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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>
This commit is contained in:
Matthew Wilcox 2017-09-08 16:14:00 -07:00 committed by Linus Torvalds
parent 4c51248533
commit fd1d362600
3 changed files with 34 additions and 6 deletions
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14
arch/arm/include/asm/string.h
View File

@ -24,6 +24,20 @@ extern void * memchr(const void *, int, __kernel_size_t);
#define __HAVE_ARCH_MEMSET
extern void * memset(void *, int, __kernel_size_t);
#define __HAVE_ARCH_MEMSET32
extern void *__memset32(uint32_t *, uint32_t v, __kernel_size_t);
static inline void *memset32(uint32_t *p, uint32_t v, __kernel_size_t n)
{
return __memset32(p, v, n * 4);
}
#define __HAVE_ARCH_MEMSET64
extern void *__memset64(uint64_t *, uint32_t low, __kernel_size_t, uint32_t hi);
static inline void *memset64(uint64_t *p, uint64_t v, __kernel_size_t n)
{
return __memset64(p, v, n * 8, v >> 32);
}
extern void __memzero(void *ptr, __kernel_size_t n);
#define memset(p,v,n) \

2
arch/arm/kernel/armksyms.c
View File

@ -87,6 +87,8 @@ EXPORT_SYMBOL(__raw_writesl);
EXPORT_SYMBOL(strchr);
EXPORT_SYMBOL(strrchr);
EXPORT_SYMBOL(memset);
EXPORT_SYMBOL(__memset32);
EXPORT_SYMBOL(__memset64);
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(memmove);
EXPORT_SYMBOL(memchr);

24
arch/arm/lib/memset.S
View File

@ -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)