diff options
Diffstat (limited to 'arch/arm/mm/copypage-v4wt.S')
| -rw-r--r-- | arch/arm/mm/copypage-v4wt.S | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/arm/mm/copypage-v4wt.S b/arch/arm/mm/copypage-v4wt.S new file mode 100644 index 0000000..9767939 --- /dev/null +++ b/arch/arm/mm/copypage-v4wt.S @@ -0,0 +1,73 @@ +/* + * linux/arch/arm/lib/copypage-v4.S + * + * Copyright (C) 1995-1999 Russell King + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * ASM optimised string functions + * + * This is for CPUs with a writethrough cache and 'flush ID cache' is + * the only supported cache operation. + */ +#include <linux/linkage.h> +#include <linux/init.h> +#include <asm/constants.h> + + .text + .align 5 +/* + * ARMv4 optimised copy_user_page + * + * Since we have writethrough caches, we don't have to worry about + * dirty data in the cache. However, we do have to ensure that + * subsequent reads are up to date. + */ +ENTRY(v4wt_copy_user_page) + stmfd sp!, {r4, lr} @ 2 + mov r2, #PAGE_SZ/64 @ 1 + ldmia r1!, {r3, r4, ip, lr} @ 4 +1: stmia r0!, {r3, r4, ip, lr} @ 4 + ldmia r1!, {r3, r4, ip, lr} @ 4+1 + stmia r0!, {r3, r4, ip, lr} @ 4 + ldmia r1!, {r3, r4, ip, lr} @ 4 + stmia r0!, {r3, r4, ip, lr} @ 4 + ldmia r1!, {r3, r4, ip, lr} @ 4 + subs r2, r2, #1 @ 1 + stmia r0!, {r3, r4, ip, lr} @ 4 + ldmneia r1!, {r3, r4, ip, lr} @ 4 + bne 1b @ 1 + mcr p15, 0, r2, c7, c7, 0 @ flush ID cache + ldmfd sp!, {r4, pc} @ 3 + + .align 5 +/* + * ARMv4 optimised clear_user_page + * + * Same story as above. + */ +ENTRY(v4wt_clear_user_page) + str lr, [sp, #-4]! + mov r1, #PAGE_SZ/64 @ 1 + mov r2, #0 @ 1 + mov r3, #0 @ 1 + mov ip, #0 @ 1 + mov lr, #0 @ 1 +1: stmia r0!, {r2, r3, ip, lr} @ 4 + stmia r0!, {r2, r3, ip, lr} @ 4 + stmia r0!, {r2, r3, ip, lr} @ 4 + stmia r0!, {r2, r3, ip, lr} @ 4 + subs r1, r1, #1 @ 1 + bne 1b @ 1 + mcr p15, 0, r2, c7, c7, 0 @ flush ID cache + ldr pc, [sp], #4 + + __INITDATA + + .type v4wt_user_fns, #object +ENTRY(v4wt_user_fns) + .long v4wt_clear_user_page + .long v4wt_copy_user_page + .size v4wt_user_fns, . - v4wt_user_fns |