| /* |
| * 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 |