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v3.15
 
 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/asm-offsets.h>
15#include <asm/cache.h>
16
17#define COPY_COUNT (PAGE_SZ / (2 * L1_CACHE_BYTES) PLD( -1 ))
18
19		.text
20		.align	5
21/*
22 * StrongARM optimised copy_page routine
23 * now 1.78bytes/cycle, was 1.60 bytes/cycle (50MHz bus -> 89MB/s)
24 * Note that we probably achieve closer to the 100MB/s target with
25 * the core clock switching.
26 */
27ENTRY(copy_page)
28		stmfd	sp!, {r4, lr}			@	2
29	PLD(	pld	[r1, #0]		)
30	PLD(	pld	[r1, #L1_CACHE_BYTES]		)
31		mov	r2, #COPY_COUNT			@	1
32		ldmia	r1!, {r3, r4, ip, lr}		@	4+1
331:	PLD(	pld	[r1, #2 * L1_CACHE_BYTES])
34	PLD(	pld	[r1, #3 * L1_CACHE_BYTES])
352:
36	.rept	(2 * L1_CACHE_BYTES / 16 - 1)
37		stmia	r0!, {r3, r4, ip, lr}		@	4
38		ldmia	r1!, {r3, r4, ip, lr}		@	4
39	.endr
40		subs	r2, r2, #1			@	1
41		stmia	r0!, {r3, r4, ip, lr}		@	4
42		ldmgtia	r1!, {r3, r4, ip, lr}		@	4
43		bgt	1b				@	1
44	PLD(	ldmeqia r1!, {r3, r4, ip, lr}	)
45	PLD(	beq	2b			)
46		ldmfd	sp!, {r4, pc}			@	3
47ENDPROC(copy_page)
v5.9
 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 *  linux/arch/arm/lib/copypage.S
 4 *
 5 *  Copyright (C) 1995-1999 Russell King
 6 *
 
 
 
 
 7 *  ASM optimised string functions
 8 */
 9#include <linux/linkage.h>
10#include <asm/assembler.h>
11#include <asm/asm-offsets.h>
12#include <asm/cache.h>
13
14#define COPY_COUNT (PAGE_SZ / (2 * L1_CACHE_BYTES) PLD( -1 ))
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	PLD(	pld	[r1, #0]		)
27	PLD(	pld	[r1, #L1_CACHE_BYTES]		)
28		mov	r2, #COPY_COUNT			@	1
29		ldmia	r1!, {r3, r4, ip, lr}		@	4+1
301:	PLD(	pld	[r1, #2 * L1_CACHE_BYTES])
31	PLD(	pld	[r1, #3 * L1_CACHE_BYTES])
322:
33	.rept	(2 * L1_CACHE_BYTES / 16 - 1)
34		stmia	r0!, {r3, r4, ip, lr}		@	4
35		ldmia	r1!, {r3, r4, ip, lr}		@	4
36	.endr
37		subs	r2, r2, #1			@	1
38		stmia	r0!, {r3, r4, ip, lr}		@	4
39		ldmiagt	r1!, {r3, r4, ip, lr}		@	4
40		bgt	1b				@	1
41	PLD(	ldmiaeq r1!, {r3, r4, ip, lr}	)
42	PLD(	beq	2b			)
43		ldmfd	sp!, {r4, pc}			@	3
44ENDPROC(copy_page)