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_BY
15
16 .text
17 .align 5
18 /*
19 * StrongARM optimised copy_page routine
20 * now 1.78bytes/cycle, was 1.60 bytes/cycle (
21 * Note that we probably achieve closer to the
22 * the core clock switching.
23 */
24 ENTRY(copy_page)
25 stmfd sp!, {r4, lr}
26 PLD( pld [r1, #0]
27 PLD( pld [r1, #L1_CACHE_BYTES]
28 mov r2, #COPY_COUNT
29 ldmia r1!, {r3, r4, ip, lr}
30 1: PLD( pld [r1, #2 * L1_CACHE_BYT
31 PLD( pld [r1, #3 * L1_CACHE_BYT
32 2:
33 .rept (2 * L1_CACHE_BYTES / 16 - 1)
34 stmia r0!, {r3, r4, ip, lr}
35 ldmia r1!, {r3, r4, ip, lr}
36 .endr
37 subs r2, r2, #1
38 stmia r0!, {r3, r4, ip, lr}
39 ldmiagt r1!, {r3, r4, ip, lr}
40 bgt 1b
41 PLD( ldmiaeq r1!, {r3, r4, ip, lr}
42 PLD( beq 2b
43 ldmfd sp!, {r4, pc}
44 ENDPROC(copy_page)
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