1/*
2 *  linux/arch/arm/lib/copypage.S
3 *
4 *  Copyright (C) 1995-1999 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 *  ASM optimised string functions
11 */
12#include <linux/linkage.h>
13#include <asm/assembler.h>
14#include <asm/constants.h>
15
16		.text
17		.align	5
18/*
19 * StrongARM optimised copy_page routine
20 * now 1.78bytes/cycle, was 1.60 bytes/cycle (50MHz bus -> 89MB/s)
21 * Note that we probably achieve closer to the 100MB/s target with
22 * the core clock switching.
23 */
24ENTRY(copy_page)
25		stmfd	sp!, {r4, lr}			@	2
26		mov	r2, #PAGE_SZ/64			@	1
27		ldmia	r1!, {r3, r4, ip, lr}		@	4+1
281:		stmia	r0!, {r3, r4, ip, lr}		@	4
29		ldmia	r1!, {r3, r4, ip, lr}		@	4+1
30		stmia	r0!, {r3, r4, ip, lr}		@	4
31		ldmia	r1!, {r3, r4, ip, lr}		@	4+1
32		stmia	r0!, {r3, r4, ip, lr}		@	4
33		ldmia	r1!, {r3, r4, ip, lr}		@	4
34		subs	r2, r2, #1			@	1
35		stmia	r0!, {r3, r4, ip, lr}		@	4
36		ldmneia	r1!, {r3, r4, ip, lr}		@	4
37		bne	1b				@	1
38		LOADREGS(fd, sp!, {r4, pc})		@	3
39