1 /* SPDX-License-Identifier: GPL-2.0-only */ !! 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * linux/arch/arm/lib/copypage.S !! 3 * arch/alpha/lib/copy_page.S
4 * 4 *
5 * Copyright (C) 1995-1999 Russell King !! 5 * Copy an entire page.
6 * <<
7 * ASM optimised string functions <<
8 */ 6 */
9 #include <linux/linkage.h> !! 7 #include <linux/export.h>
10 #include <asm/assembler.h> !! 8 .text
11 #include <asm/asm-offsets.h> !! 9 .align 4
12 #include <asm/cache.h> !! 10 .global copy_page
>> 11 .ent copy_page
>> 12 copy_page:
>> 13 .prologue 0
13 14
14 #define COPY_COUNT (PAGE_SZ / (2 * L1_CACHE_BY !! 15 lda $18,128
>> 16 nop
>> 17 unop
>> 18 nop
15 19
16 .text !! 20 1: ldq $0,0($17)
17 .align 5 !! 21 ldq $1,8($17)
18 /* !! 22 ldq $2,16($17)
19 * StrongARM optimised copy_page routine !! 23 ldq $3,24($17)
20 * now 1.78bytes/cycle, was 1.60 bytes/cycle ( !! 24
21 * Note that we probably achieve closer to the !! 25 ldq $4,32($17)
22 * the core clock switching. !! 26 ldq $5,40($17)
23 */ !! 27 ldq $6,48($17)
24 ENTRY(copy_page) !! 28 ldq $7,56($17)
25 stmfd sp!, {r4, lr} !! 29
26 PLD( pld [r1, #0] !! 30 stq $0,0($16)
27 PLD( pld [r1, #L1_CACHE_BYTES] !! 31 subq $18,1,$18
28 mov r2, #COPY_COUNT !! 32 stq $1,8($16)
29 ldmia r1!, {r3, r4, ip, lr} !! 33 addq $17,64,$17
30 1: PLD( pld [r1, #2 * L1_CACHE_BYT !! 34
31 PLD( pld [r1, #3 * L1_CACHE_BYT !! 35 stq $2,16($16)
32 2: !! 36 stq $3,24($16)
33 .rept (2 * L1_CACHE_BYTES / 16 - 1) !! 37 stq $4,32($16)
34 stmia r0!, {r3, r4, ip, lr} !! 38 stq $5,40($16)
35 ldmia r1!, {r3, r4, ip, lr} !! 39
36 .endr !! 40 stq $6,48($16)
37 subs r2, r2, #1 !! 41 stq $7,56($16)
38 stmia r0!, {r3, r4, ip, lr} !! 42 addq $16,64,$16
39 ldmiagt r1!, {r3, r4, ip, lr} !! 43 bne $18, 1b
40 bgt 1b !! 44
41 PLD( ldmiaeq r1!, {r3, r4, ip, lr} !! 45 ret
42 PLD( beq 2b !! 46 nop
43 ldmfd sp!, {r4, pc} !! 47 unop
44 ENDPROC(copy_page) !! 48 nop
>> 49
>> 50 .end copy_page
>> 51 EXPORT_SYMBOL(copy_page)
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