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);
48	kfrom = kmap_atomic(from);
49	fa_copy_user_page(kto, kfrom);
50	kunmap_atomic(kfrom);
51	kunmap_atomic(kto);
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);
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);
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};
87