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
feroceon_copy_user_page(void * kto,const void * kfrom)16 static void feroceon_copy_user_page(void *kto, const void *kfrom)
17 {
18 int tmp;
19
20 asm volatile ("\
21 1: ldmia %1!, {r2 - r7, ip, lr} \n\
22 pld [%1, #0] \n\
23 pld [%1, #32] \n\
24 pld [%1, #64] \n\
25 pld [%1, #96] \n\
26 pld [%1, #128] \n\
27 pld [%1, #160] \n\
28 pld [%1, #192] \n\
29 stmia %0, {r2 - r7, ip, lr} \n\
30 ldmia %1!, {r2 - r7, ip, lr} \n\
31 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
32 add %0, %0, #32 \n\
33 stmia %0, {r2 - r7, ip, lr} \n\
34 ldmia %1!, {r2 - r7, ip, lr} \n\
35 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
36 add %0, %0, #32 \n\
37 stmia %0, {r2 - r7, ip, lr} \n\
38 ldmia %1!, {r2 - r7, ip, lr} \n\
39 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
40 add %0, %0, #32 \n\
41 stmia %0, {r2 - r7, ip, lr} \n\
42 ldmia %1!, {r2 - r7, ip, lr} \n\
43 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
44 add %0, %0, #32 \n\
45 stmia %0, {r2 - r7, ip, lr} \n\
46 ldmia %1!, {r2 - r7, ip, lr} \n\
47 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
48 add %0, %0, #32 \n\
49 stmia %0, {r2 - r7, ip, lr} \n\
50 ldmia %1!, {r2 - r7, ip, lr} \n\
51 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
52 add %0, %0, #32 \n\
53 stmia %0, {r2 - r7, ip, lr} \n\
54 ldmia %1!, {r2 - r7, ip, lr} \n\
55 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
56 add %0, %0, #32 \n\
57 stmia %0, {r2 - r7, ip, lr} \n\
58 subs %2, %2, #(32 * 8) \n\
59 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
60 add %0, %0, #32 \n\
61 bne 1b \n\
62 mcr p15, 0, %2, c7, c10, 4 @ drain WB"
63 : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
64 : "2" (PAGE_SIZE)
65 : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
66 }
67
feroceon_copy_user_highpage(struct page * to,struct page * from,unsigned long vaddr,struct vm_area_struct * vma)68 void feroceon_copy_user_highpage(struct page *to, struct page *from,
69 unsigned long vaddr, struct vm_area_struct *vma)
70 {
71 void *kto, *kfrom;
72
73 kto = kmap_atomic(to);
74 kfrom = kmap_atomic(from);
75 flush_cache_page(vma, vaddr, page_to_pfn(from));
76 feroceon_copy_user_page(kto, kfrom);
77 kunmap_atomic(kfrom);
78 kunmap_atomic(kto);
79 }
80
feroceon_clear_user_highpage(struct page * page,unsigned long vaddr)81 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
82 {
83 void *ptr, *kaddr = kmap_atomic(page);
84 asm volatile ("\
85 mov r1, %2 \n\
86 mov r2, #0 \n\
87 mov r3, #0 \n\
88 mov r4, #0 \n\
89 mov r5, #0 \n\
90 mov r6, #0 \n\
91 mov r7, #0 \n\
92 mov ip, #0 \n\
93 mov lr, #0 \n\
94 1: stmia %0, {r2-r7, ip, lr} \n\
95 subs r1, r1, #1 \n\
96 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
97 add %0, %0, #32 \n\
98 bne 1b \n\
99 mcr p15, 0, r1, c7, c10, 4 @ drain WB"
100 : "=r" (ptr)
101 : "0" (kaddr), "I" (PAGE_SIZE / 32)
102 : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
103 kunmap_atomic(kaddr);
104 }
105
106 struct cpu_user_fns feroceon_user_fns __initdata = {
107 .cpu_clear_user_highpage = feroceon_clear_user_highpage,
108 .cpu_copy_user_highpage = feroceon_copy_user_highpage,
109 };
110
111