Linux Kernel  3.7.1
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copypage-feroceon.c
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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  *
10  * This handles copy_user_highpage and clear_user_page on Feroceon
11  * more optimally than the generic implementations.
12  */
13 #include <linux/init.h>
14 #include <linux/highmem.h>
15 
16 static void __naked
17 feroceon_copy_user_page(void *kto, const void *kfrom)
18 {
19  asm("\
20  stmfd sp!, {r4-r9, lr} \n\
21  mov ip, %2 \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  : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE));
68 }
69 
70 void feroceon_copy_user_highpage(struct page *to, struct page *from,
71  unsigned long vaddr, struct vm_area_struct *vma)
72 {
73  void *kto, *kfrom;
74 
75  kto = kmap_atomic(to);
76  kfrom = kmap_atomic(from);
77  flush_cache_page(vma, vaddr, page_to_pfn(from));
78  feroceon_copy_user_page(kto, kfrom);
79  kunmap_atomic(kfrom);
80  kunmap_atomic(kto);
81 }
82 
83 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
84 {
85  void *ptr, *kaddr = kmap_atomic(page);
86  asm volatile ("\
87  mov r1, %2 \n\
88  mov r2, #0 \n\
89  mov r3, #0 \n\
90  mov r4, #0 \n\
91  mov r5, #0 \n\
92  mov r6, #0 \n\
93  mov r7, #0 \n\
94  mov ip, #0 \n\
95  mov lr, #0 \n\
96 1: stmia %0, {r2-r7, ip, lr} \n\
97  subs r1, r1, #1 \n\
98  mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
99  add %0, %0, #32 \n\
100  bne 1b \n\
101  mcr p15, 0, r1, c7, c10, 4 @ drain WB"
102  : "=r" (ptr)
103  : "0" (kaddr), "I" (PAGE_SIZE / 32)
104  : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
105  kunmap_atomic(kaddr);
106 }
107 
108 struct cpu_user_fns feroceon_user_fns __initdata = {
109  .cpu_clear_user_highpage = feroceon_clear_user_highpage,
110  .cpu_copy_user_highpage = feroceon_copy_user_highpage,
111 };
112