https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 4b119e21d0c66c22e8ca03df05d9de623d0eb50f authored by Linus Torvalds on 17 April 2008, 02:49:44 UTC
Linux 2.6.25
Linux 2.6.25
Tip revision: 4b119e2
copypage-v4wt.S
/*
* 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/asm-offsets.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