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
16static void __naked
17feroceon_copy_user_page(void *kto, const void *kfrom)
18{
19	asm("\
20	stmfd	sp!, {r4-r9, lr}		\n\
21	mov	ip, %2				\n\
221:	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
70void 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
83void 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\
961:	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
108struct 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
113