Commit | Line | Data |
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28853ac8 PZ |
1 | /* |
2 | * linux/arch/arm/lib/copypage-fa.S | |
3 | * | |
4 | * Copyright (C) 2005 Faraday Corp. | |
5 | * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> | |
6 | * | |
7 | * Based on copypage-v4wb.S: | |
8 | * Copyright (C) 1995-1999 Russell King | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | #include <linux/init.h> | |
15 | #include <linux/highmem.h> | |
16 | ||
17 | /* | |
18 | * Faraday optimised copy_user_page | |
19 | */ | |
20 | static void __naked | |
21 | fa_copy_user_page(void *kto, const void *kfrom) | |
22 | { | |
23 | asm("\ | |
24 | stmfd sp!, {r4, lr} @ 2\n\ | |
25 | mov r2, %0 @ 1\n\ | |
26 | 1: ldmia r1!, {r3, r4, ip, lr} @ 4\n\ | |
27 | stmia r0, {r3, r4, ip, lr} @ 4\n\ | |
28 | mcr p15, 0, r0, c7, c14, 1 @ 1 clean and invalidate D line\n\ | |
29 | add r0, r0, #16 @ 1\n\ | |
30 | ldmia r1!, {r3, r4, ip, lr} @ 4\n\ | |
31 | stmia r0, {r3, r4, ip, lr} @ 4\n\ | |
32 | mcr p15, 0, r0, c7, c14, 1 @ 1 clean and invalidate D line\n\ | |
33 | add r0, r0, #16 @ 1\n\ | |
34 | subs r2, r2, #1 @ 1\n\ | |
35 | bne 1b @ 1\n\ | |
36 | mcr p15, 0, r2, c7, c10, 4 @ 1 drain WB\n\ | |
37 | ldmfd sp!, {r4, pc} @ 3" | |
38 | : | |
39 | : "I" (PAGE_SIZE / 32)); | |
40 | } | |
41 | ||
42 | void fa_copy_user_highpage(struct page *to, struct page *from, | |
a3be6327 | 43 | unsigned long vaddr, struct vm_area_struct *vma) |
28853ac8 PZ |
44 | { |
45 | void *kto, *kfrom; | |
46 | ||
47 | kto = kmap_atomic(to, KM_USER0); | |
48 | kfrom = kmap_atomic(from, KM_USER1); | |
49 | fa_copy_user_page(kto, kfrom); | |
50 | kunmap_atomic(kfrom, KM_USER1); | |
51 | kunmap_atomic(kto, KM_USER0); | |
52 | } | |
53 | ||
54 | /* | |
55 | * Faraday optimised clear_user_page | |
56 | * | |
57 | * Same story as above. | |
58 | */ | |
59 | void fa_clear_user_highpage(struct page *page, unsigned long vaddr) | |
60 | { | |
61 | void *ptr, *kaddr = kmap_atomic(page, KM_USER0); | |
62 | asm volatile("\ | |
63 | mov r1, %2 @ 1\n\ | |
64 | mov r2, #0 @ 1\n\ | |
65 | mov r3, #0 @ 1\n\ | |
66 | mov ip, #0 @ 1\n\ | |
67 | mov lr, #0 @ 1\n\ | |
68 | 1: stmia %0, {r2, r3, ip, lr} @ 4\n\ | |
69 | mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ | |
70 | add %0, %0, #16 @ 1\n\ | |
71 | stmia %0, {r2, r3, ip, lr} @ 4\n\ | |
72 | mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ | |
73 | add %0, %0, #16 @ 1\n\ | |
74 | subs r1, r1, #1 @ 1\n\ | |
75 | bne 1b @ 1\n\ | |
76 | mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB" | |
77 | : "=r" (ptr) | |
78 | : "0" (kaddr), "I" (PAGE_SIZE / 32) | |
79 | : "r1", "r2", "r3", "ip", "lr"); | |
80 | kunmap_atomic(kaddr, KM_USER0); | |
81 | } | |
82 | ||
83 | struct cpu_user_fns fa_user_fns __initdata = { | |
84 | .cpu_clear_user_highpage = fa_clear_user_highpage, | |
85 | .cpu_copy_user_highpage = fa_copy_user_highpage, | |
86 | }; |