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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 */
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,
43 unsigned long vaddr, struct vm_area_struct *vma)
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 */
59void 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\
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");
80 kunmap_atomic(kaddr, KM_USER0);
81}
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};
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/lib/copypage-fa.S
4 *
5 * Copyright (C) 2005 Faraday Corp.
6 * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
7 *
8 * Based on copypage-v4wb.S:
9 * Copyright (C) 1995-1999 Russell King
10 */
11#include <linux/init.h>
12#include <linux/highmem.h>
13
14/*
15 * Faraday optimised copy_user_page
16 */
17static void fa_copy_user_page(void *kto, const void *kfrom)
18{
19 int tmp;
20
21 asm volatile ("\
221: ldmia %1!, {r3, r4, ip, lr} @ 4\n\
23 stmia %0, {r3, r4, ip, lr} @ 4\n\
24 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
25 add %0, %0, #16 @ 1\n\
26 ldmia %1!, {r3, r4, ip, lr} @ 4\n\
27 stmia %0, {r3, r4, ip, lr} @ 4\n\
28 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
29 add %0, %0, #16 @ 1\n\
30 subs %2, %2, #1 @ 1\n\
31 bne 1b @ 1\n\
32 mcr p15, 0, %2, c7, c10, 4 @ 1 drain WB"
33 : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
34 : "2" (PAGE_SIZE / 32)
35 : "r3", "r4", "ip", "lr");
36}
37
38void fa_copy_user_highpage(struct page *to, struct page *from,
39 unsigned long vaddr, struct vm_area_struct *vma)
40{
41 void *kto, *kfrom;
42
43 kto = kmap_atomic(to);
44 kfrom = kmap_atomic(from);
45 fa_copy_user_page(kto, kfrom);
46 kunmap_atomic(kfrom);
47 kunmap_atomic(kto);
48}
49
50/*
51 * Faraday optimised clear_user_page
52 *
53 * Same story as above.
54 */
55void fa_clear_user_highpage(struct page *page, unsigned long vaddr)
56{
57 void *ptr, *kaddr = kmap_atomic(page);
58 asm volatile("\
59 mov r1, %2 @ 1\n\
60 mov r2, #0 @ 1\n\
61 mov r3, #0 @ 1\n\
62 mov ip, #0 @ 1\n\
63 mov lr, #0 @ 1\n\
641: stmia %0, {r2, r3, ip, lr} @ 4\n\
65 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
66 add %0, %0, #16 @ 1\n\
67 stmia %0, {r2, r3, ip, lr} @ 4\n\
68 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
69 add %0, %0, #16 @ 1\n\
70 subs r1, r1, #1 @ 1\n\
71 bne 1b @ 1\n\
72 mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB"
73 : "=r" (ptr)
74 : "0" (kaddr), "I" (PAGE_SIZE / 32)
75 : "r1", "r2", "r3", "ip", "lr");
76 kunmap_atomic(kaddr);
77}
78
79struct cpu_user_fns fa_user_fns __initdata = {
80 .cpu_clear_user_highpage = fa_clear_user_highpage,
81 .cpu_copy_user_highpage = fa_copy_user_highpage,
82};