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d73e60b7 RK |
1 | /* |
2 | * linux/arch/arm/mm/copypage-v3.c | |
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 | #include <linux/init.h> | |
063b0a42 | 11 | #include <linux/highmem.h> |
d73e60b7 RK |
12 | |
13 | /* | |
063b0a42 | 14 | * ARMv3 optimised copy_user_highpage |
d73e60b7 RK |
15 | * |
16 | * FIXME: do we need to handle cache stuff... | |
17 | */ | |
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18 | static void __attribute__((naked)) |
19 | v3_copy_user_page(void *kto, const void *kfrom) | |
d73e60b7 RK |
20 | { |
21 | asm("\n\ | |
22 | stmfd sp!, {r4, lr} @ 2\n\ | |
23 | mov r2, %2 @ 1\n\ | |
24 | ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\ | |
25 | 1: stmia %1!, {r3, r4, ip, lr} @ 4\n\ | |
26 | ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\ | |
27 | stmia %1!, {r3, r4, ip, lr} @ 4\n\ | |
28 | ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\ | |
29 | stmia %1!, {r3, r4, ip, lr} @ 4\n\ | |
30 | ldmia %0!, {r3, r4, ip, lr} @ 4\n\ | |
31 | subs r2, r2, #1 @ 1\n\ | |
32 | stmia %1!, {r3, r4, ip, lr} @ 4\n\ | |
33 | ldmneia %0!, {r3, r4, ip, lr} @ 4\n\ | |
34 | bne 1b @ 1\n\ | |
35 | ldmfd sp!, {r4, pc} @ 3" | |
36 | : | |
37 | : "r" (kfrom), "r" (kto), "I" (PAGE_SIZE / 64)); | |
38 | } | |
39 | ||
063b0a42 RK |
40 | void v3_copy_user_highpage(struct page *to, struct page *from, |
41 | unsigned long vaddr) | |
42 | { | |
43 | void *kto, *kfrom; | |
44 | ||
45 | kto = kmap_atomic(to, KM_USER0); | |
46 | kfrom = kmap_atomic(from, KM_USER1); | |
47 | v3_copy_user_page(kto, kfrom); | |
48 | kunmap_atomic(kfrom, KM_USER1); | |
49 | kunmap_atomic(kto, KM_USER0); | |
50 | } | |
51 | ||
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52 | /* |
53 | * ARMv3 optimised clear_user_page | |
54 | * | |
55 | * FIXME: do we need to handle cache stuff... | |
56 | */ | |
303c6443 | 57 | void v3_clear_user_highpage(struct page *page, unsigned long vaddr) |
d73e60b7 | 58 | { |
43ae286b NP |
59 | void *ptr, *kaddr = kmap_atomic(page, KM_USER0); |
60 | asm volatile("\n\ | |
61 | mov r1, %2 @ 1\n\ | |
d73e60b7 RK |
62 | mov r2, #0 @ 1\n\ |
63 | mov r3, #0 @ 1\n\ | |
64 | mov ip, #0 @ 1\n\ | |
65 | mov lr, #0 @ 1\n\ | |
66 | 1: stmia %0!, {r2, r3, ip, lr} @ 4\n\ | |
67 | stmia %0!, {r2, r3, ip, lr} @ 4\n\ | |
68 | stmia %0!, {r2, r3, ip, lr} @ 4\n\ | |
69 | stmia %0!, {r2, r3, ip, lr} @ 4\n\ | |
70 | subs r1, r1, #1 @ 1\n\ | |
303c6443 | 71 | bne 1b @ 1" |
43ae286b NP |
72 | : "=r" (ptr) |
73 | : "0" (kaddr), "I" (PAGE_SIZE / 64) | |
303c6443 RK |
74 | : "r1", "r2", "r3", "ip", "lr"); |
75 | kunmap_atomic(kaddr, KM_USER0); | |
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76 | } |
77 | ||
78 | struct cpu_user_fns v3_user_fns __initdata = { | |
303c6443 | 79 | .cpu_clear_user_highpage = v3_clear_user_highpage, |
063b0a42 | 80 | .cpu_copy_user_highpage = v3_copy_user_highpage, |
d73e60b7 | 81 | }; |