aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mm/copypage-v3.c
blob: 3935bddd4769f654aac0f6bfb509927fd4dad622 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
/*
 *  linux/arch/arm/mm/copypage-v3.c
 *
 *  Copyright (C) 1995-1999 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/init.h>
#include <linux/highmem.h>

/*
 * ARMv3 optimised copy_user_highpage
 *
 * FIXME: do we need to handle cache stuff...
 */
static void __naked
v3_copy_user_page(void *kto, const void *kfrom)
{
	asm("\n\
	stmfd	sp!, {r4, lr}			@	2\n\
	mov	r2, %2				@	1\n\
	ldmia	%0!, {r3, r4, ip, lr}		@	4+1\n\
1:	stmia	%1!, {r3, r4, ip, lr}		@	4\n\
	ldmia	%0!, {r3, r4, ip, lr}		@	4+1\n\
	stmia	%1!, {r3, r4, ip, lr}		@	4\n\
	ldmia	%0!, {r3, r4, ip, lr}		@	4+1\n\
	stmia	%1!, {r3, r4, ip, lr}		@	4\n\
	ldmia	%0!, {r3, r4, ip, lr}		@	4\n\
	subs	r2, r2, #1			@	1\n\
	stmia	%1!, {r3, r4, ip, lr}		@	4\n\
	ldmneia	%0!, {r3, r4, ip, lr}		@	4\n\
	bne	1b				@	1\n\
	ldmfd	sp!, {r4, pc}			@	3"
	:
	: "r" (kfrom), "r" (kto), "I" (PAGE_SIZE / 64));
}

void v3_copy_user_highpage(struct page *to, struct page *from,
	unsigned long vaddr, struct vm_area_struct *vma)
{
	void *kto, *kfrom;

	kto = kmap_atomic(to);
	kfrom = kmap_atomic(from);
	v3_copy_user_page(kto, kfrom);
	kunmap_atomic(kfrom);
	kunmap_atomic(kto);
}

/*
 * ARMv3 optimised clear_user_page
 *
 * FIXME: do we need to handle cache stuff...
 */
void v3_clear_user_highpage(struct page *page, unsigned long vaddr)
{
	void *ptr, *kaddr = kmap_atomic(page);
	asm volatile("\n\
	mov	r1, %2				@ 1\n\
	mov	r2, #0				@ 1\n\
	mov	r3, #0				@ 1\n\
	mov	ip, #0				@ 1\n\
	mov	lr, #0				@ 1\n\
1:	stmia	%0!, {r2, r3, ip, lr}		@ 4\n\
	stmia	%0!, {r2, r3, ip, lr}		@ 4\n\
	stmia	%0!, {r2, r3, ip, lr}		@ 4\n\
	stmia	%0!, {r2, r3, ip, lr}		@ 4\n\
	subs	r1, r1, #1			@ 1\n\
	bne	1b				@ 1"
	: "=r" (ptr)
	: "0" (kaddr), "I" (PAGE_SIZE / 64)
	: "r1", "r2", "r3", "ip", "lr");
	kunmap_atomic(kaddr);
}

struct cpu_user_fns v3_user_fns __initdata = {
	.cpu_clear_user_highpage = v3_clear_user_highpage,
	.cpu_copy_user_highpage	= v3_copy_user_highpage,
};