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1da177e4 LT |
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 <linux/init.h> | |
14 | #include <asm/assembler.h> | |
e6ae744d | 15 | #include <asm/asm-offsets.h> |
1da177e4 LT |
16 | |
17 | .text | |
18 | .align 5 | |
19 | /* | |
20 | * ARMv3 optimised copy_user_page | |
21 | * | |
22 | * FIXME: do we need to handle cache stuff... | |
23 | */ | |
24 | ENTRY(v3_copy_user_page) | |
25 | stmfd sp!, {r4, lr} @ 2 | |
26 | mov r2, #PAGE_SZ/64 @ 1 | |
27 | ldmia r1!, {r3, r4, ip, lr} @ 4+1 | |
28 | 1: 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 | |
1b93a717 | 38 | ldmfd sp!, {r4, pc} @ 3 |
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39 | |
40 | .align 5 | |
41 | /* | |
42 | * ARMv3 optimised clear_user_page | |
43 | * | |
44 | * FIXME: do we need to handle cache stuff... | |
45 | */ | |
46 | ENTRY(v3_clear_user_page) | |
47 | str lr, [sp, #-4]! | |
48 | mov r1, #PAGE_SZ/64 @ 1 | |
49 | mov r2, #0 @ 1 | |
50 | mov r3, #0 @ 1 | |
51 | mov ip, #0 @ 1 | |
52 | mov lr, #0 @ 1 | |
53 | 1: stmia r0!, {r2, r3, ip, lr} @ 4 | |
54 | stmia r0!, {r2, r3, ip, lr} @ 4 | |
55 | stmia r0!, {r2, r3, ip, lr} @ 4 | |
56 | stmia r0!, {r2, r3, ip, lr} @ 4 | |
57 | subs r1, r1, #1 @ 1 | |
58 | bne 1b @ 1 | |
59 | ldr pc, [sp], #4 | |
60 | ||
61 | __INITDATA | |
62 | ||
63 | .type v3_user_fns, #object | |
64 | ENTRY(v3_user_fns) | |
65 | .long v3_clear_user_page | |
66 | .long v3_copy_user_page | |
67 | .size v3_user_fns, . - v3_user_fns |