blob: d130a5ece5d55658b1c6cdd11f2721e7ea3f53f6 [file] [log] [blame]
Paulius Zaleckas28853ac2009-03-25 13:10:01 +02001/*
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 */
20static void __naked
21fa_copy_user_page(void *kto, const void *kfrom)
22{
23 asm("\
24 stmfd sp!, {r4, lr} @ 2\n\
25 mov r2, %0 @ 1\n\
261: 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
42void fa_copy_user_highpage(struct page *to, struct page *from,
Hans Ulli Krolla3be6322010-04-27 12:45:10 +020043 unsigned long vaddr, struct vm_area_struct *vma)
Paulius Zaleckas28853ac2009-03-25 13:10:01 +020044{
45 void *kto, *kfrom;
46
Cong Wang5472e862011-11-25 23:14:15 +080047 kto = kmap_atomic(to);
48 kfrom = kmap_atomic(from);
Paulius Zaleckas28853ac2009-03-25 13:10:01 +020049 fa_copy_user_page(kto, kfrom);
Cong Wang5472e862011-11-25 23:14:15 +080050 kunmap_atomic(kfrom);
51 kunmap_atomic(kto);
Paulius Zaleckas28853ac2009-03-25 13:10:01 +020052}
53
54/*
55 * Faraday optimised clear_user_page
56 *
57 * Same story as above.
58 */
59void fa_clear_user_highpage(struct page *page, unsigned long vaddr)
60{
Cong Wang5472e862011-11-25 23:14:15 +080061 void *ptr, *kaddr = kmap_atomic(page);
Paulius Zaleckas28853ac2009-03-25 13:10:01 +020062 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\
681: 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");
Cong Wang5472e862011-11-25 23:14:15 +080080 kunmap_atomic(kaddr);
Paulius Zaleckas28853ac2009-03-25 13:10:01 +020081}
82
83struct 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};