lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[ARM] copypage: convert assembly files to C

Browse Source 
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2008-10-31 13:08:02 +00:00
committed by Russell King
parent 487ff32082
commit d73e60b714
10 changed files with 431 additions and 411 deletions
Download Patch File Download Diff File Expand all files Collapse all files

77
arch/arm/mm/copypage-v4wt.c Normal file
View File

@@ -0,0 +1,77 @@
/*
* linux/arch/arm/mm/copypage-v4wt.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.
*
* This is for CPUs with a writethrough cache and 'flush ID cache' is
* the only supported cache operation.
*/
#include <linux/init.h>
#include <asm/page.h>
/*
* 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.
*/
void __attribute__((naked))
v4wt_copy_user_page(void *kto, const void *kfrom, unsigned long vaddr)
{
asm("\
stmfd sp!, {r4, lr} @ 2\n\
mov r2, %0 @ 1\n\
ldmia r1!, {r3, r4, ip, lr} @ 4\n\
1: stmia r0!, {r3, r4, ip, lr} @ 4\n\
ldmia r1!, {r3, r4, ip, lr} @ 4+1\n\
stmia r0!, {r3, r4, ip, lr} @ 4\n\
ldmia r1!, {r3, r4, ip, lr} @ 4\n\
stmia r0!, {r3, r4, ip, lr} @ 4\n\
ldmia r1!, {r3, r4, ip, lr} @ 4\n\
subs r2, r2, #1 @ 1\n\
stmia r0!, {r3, r4, ip, lr} @ 4\n\
ldmneia r1!, {r3, r4, ip, lr} @ 4\n\
bne 1b @ 1\n\
mcr p15, 0, r2, c7, c7, 0 @ flush ID cache\n\
ldmfd sp!, {r4, pc} @ 3"
:
: "I" (PAGE_SIZE / 64));
}
/*
* ARMv4 optimised clear_user_page
*
* Same story as above.
*/
void __attribute__((naked))
v4wt_clear_user_page(void *kaddr, unsigned long vaddr)
{
asm("\
str lr, [sp, #-4]!\n\
mov r1, %0 @ 1\n\
mov r2, #0 @ 1\n\
mov r3, #0 @ 1\n\
mov ip, #0 @ 1\n\
mov lr, #0 @ 1\n\
1: stmia r0!, {r2, r3, ip, lr} @ 4\n\
stmia r0!, {r2, r3, ip, lr} @ 4\n\
stmia r0!, {r2, r3, ip, lr} @ 4\n\
stmia r0!, {r2, r3, ip, lr} @ 4\n\
subs r1, r1, #1 @ 1\n\
bne 1b @ 1\n\
mcr p15, 0, r2, c7, c7, 0 @ flush ID cache\n\
ldr pc, [sp], #4"
:
: "I" (PAGE_SIZE / 64));
}
struct cpu_user_fns v4wt_user_fns __initdata = {
.cpu_clear_user_page = v4wt_clear_user_page,
.cpu_copy_user_page = v4wt_copy_user_page,
};