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d73e60b7 RK |
1 | /* |
2 | * linux/arch/arm/mm/copypage-feroceon.S | |
3 | * | |
4 | * Copyright (C) 2008 Marvell Semiconductors | |
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 | * | |
063b0a42 | 10 | * This handles copy_user_highpage and clear_user_page on Feroceon |
d73e60b7 RK |
11 | * more optimally than the generic implementations. |
12 | */ | |
13 | #include <linux/init.h> | |
063b0a42 | 14 | #include <linux/highmem.h> |
d73e60b7 | 15 | |
446c92b2 | 16 | static void __naked |
063b0a42 | 17 | feroceon_copy_user_page(void *kto, const void *kfrom) |
d73e60b7 RK |
18 | { |
19 | asm("\ | |
20 | stmfd sp!, {r4-r9, lr} \n\ | |
21 | mov ip, %0 \n\ | |
22 | 1: mov lr, r1 \n\ | |
23 | ldmia r1!, {r2 - r9} \n\ | |
24 | pld [lr, #32] \n\ | |
25 | pld [lr, #64] \n\ | |
26 | pld [lr, #96] \n\ | |
27 | pld [lr, #128] \n\ | |
28 | pld [lr, #160] \n\ | |
29 | pld [lr, #192] \n\ | |
30 | pld [lr, #224] \n\ | |
31 | stmia r0, {r2 - r9} \n\ | |
32 | ldmia r1!, {r2 - r9} \n\ | |
33 | mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ | |
34 | add r0, r0, #32 \n\ | |
35 | stmia r0, {r2 - r9} \n\ | |
36 | ldmia r1!, {r2 - r9} \n\ | |
37 | mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ | |
38 | add r0, r0, #32 \n\ | |
39 | stmia r0, {r2 - r9} \n\ | |
40 | ldmia r1!, {r2 - r9} \n\ | |
41 | mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ | |
42 | add r0, r0, #32 \n\ | |
43 | stmia r0, {r2 - r9} \n\ | |
44 | ldmia r1!, {r2 - r9} \n\ | |
45 | mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ | |
46 | add r0, r0, #32 \n\ | |
47 | stmia r0, {r2 - r9} \n\ | |
48 | ldmia r1!, {r2 - r9} \n\ | |
49 | mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ | |
50 | add r0, r0, #32 \n\ | |
51 | stmia r0, {r2 - r9} \n\ | |
52 | ldmia r1!, {r2 - r9} \n\ | |
53 | mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ | |
54 | add r0, r0, #32 \n\ | |
55 | stmia r0, {r2 - r9} \n\ | |
56 | ldmia r1!, {r2 - r9} \n\ | |
57 | mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ | |
58 | add r0, r0, #32 \n\ | |
59 | stmia r0, {r2 - r9} \n\ | |
60 | subs ip, ip, #(32 * 8) \n\ | |
61 | mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ | |
62 | add r0, r0, #32 \n\ | |
63 | bne 1b \n\ | |
64 | mcr p15, 0, ip, c7, c10, 4 @ drain WB\n\ | |
65 | ldmfd sp!, {r4-r9, pc}" | |
66 | : | |
67 | : "I" (PAGE_SIZE)); | |
68 | } | |
69 | ||
063b0a42 RK |
70 | void feroceon_copy_user_highpage(struct page *to, struct page *from, |
71 | unsigned long vaddr) | |
72 | { | |
73 | void *kto, *kfrom; | |
74 | ||
75 | kto = kmap_atomic(to, KM_USER0); | |
76 | kfrom = kmap_atomic(from, KM_USER1); | |
77 | feroceon_copy_user_page(kto, kfrom); | |
78 | kunmap_atomic(kfrom, KM_USER1); | |
79 | kunmap_atomic(kto, KM_USER0); | |
80 | } | |
81 | ||
303c6443 | 82 | void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr) |
d73e60b7 | 83 | { |
43ae286b NP |
84 | void *ptr, *kaddr = kmap_atomic(page, KM_USER0); |
85 | asm volatile ("\ | |
86 | mov r1, %2 \n\ | |
d73e60b7 RK |
87 | mov r2, #0 \n\ |
88 | mov r3, #0 \n\ | |
89 | mov r4, #0 \n\ | |
90 | mov r5, #0 \n\ | |
91 | mov r6, #0 \n\ | |
92 | mov r7, #0 \n\ | |
93 | mov ip, #0 \n\ | |
94 | mov lr, #0 \n\ | |
303c6443 | 95 | 1: stmia %0, {r2-r7, ip, lr} \n\ |
d73e60b7 | 96 | subs r1, r1, #1 \n\ |
303c6443 | 97 | mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ |
43ae286b | 98 | add %0, %0, #32 \n\ |
d73e60b7 | 99 | bne 1b \n\ |
303c6443 | 100 | mcr p15, 0, r1, c7, c10, 4 @ drain WB" |
43ae286b NP |
101 | : "=r" (ptr) |
102 | : "0" (kaddr), "I" (PAGE_SIZE / 32) | |
303c6443 RK |
103 | : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr"); |
104 | kunmap_atomic(kaddr, KM_USER0); | |
d73e60b7 RK |
105 | } |
106 | ||
107 | struct cpu_user_fns feroceon_user_fns __initdata = { | |
303c6443 | 108 | .cpu_clear_user_highpage = feroceon_clear_user_highpage, |
063b0a42 | 109 | .cpu_copy_user_highpage = feroceon_copy_user_highpage, |
d73e60b7 RK |
110 | }; |
111 |