diff options
Diffstat (limited to 'arch/arm/lib/string.S')
| -rw-r--r-- | arch/arm/lib/string.S | 53 |
1 files changed, 42 insertions, 11 deletions
diff --git a/arch/arm/lib/string.S b/arch/arm/lib/string.S index b54c902a4..17daa9d26 100644 --- a/arch/arm/lib/string.S +++ b/arch/arm/lib/string.S @@ -1,24 +1,55 @@ /* * linux/arch/arm/lib/string.S * - * Copyright (C) 1995, 1996 Russell King + * Copyright (C) 1995-1998 Russell King + * + * This is commonly used to clear the frame buffer and the frame + * backing buffer. As such, it will be rarely called with r2 < 32. + * + * Optimisations by Matthew Wilcox */ #include <linux/linkage.h> #include <asm/assembler.h> .text # Prototype: char *strrchr(const char *s,char c); -@ r0 = pointer, r1 = length - .global memzero -memzero: stmfd sp!, {lr} - mov r2, #0 - mov r3, #0 - mov ip, #0 - mov lr, #0 -1: subs r1, r1, #4*8 - stmgeia r0!, {r2, r3, ip, lr} - stmgeia r0!, {r2, r3, ip, lr} +/* + * Prototype: void memzero(void *d, size_t n) + */ +ENTRY(memzero) + mov r2, r1 + mov r1, #0 +/* + * Prototype: void memsetl(unsigned long *d, unsigned long c, size_t n) + */ +ENTRY(memsetl) + teq r2, #0 + RETINSTR(moveq,pc,lr) + stmfd sp!, {lr} + mov lr, r1 + mov r3, r1 + mov ip, r1 + + @ r2 = {32 ... 4} + +1: subs r2, r2, #32 + stmgeia r0!, {r1, r3, ip, lr} + stmgeia r0!, {r1, r3, ip, lr} bgt 1b + LOADREGS(eqfd, sp!, {pc}) + + @ r2 can be {-4 ... -28} + + cmp r2, #-16 + stmgeia r0!, {r1, r3, ip, lr} + addlts r2, r2, #16 + LOADREGS(eqfd, sp!, {pc}) + + @ r2 can be {-4 ... -12} + + cmp r2, #-8 + stmgeia r0!, {r1, r3} + strne r1, [r0] LOADREGS(fd, sp!, {pc}) .global __page_memcpy |