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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
| // SPDX-License-Identifier: GPL-2.0-only
| /*
| * linux/arch/arm/mm/copypage-feroceon.S
| *
| * Copyright (C) 2008 Marvell Semiconductors
| *
| * This handles copy_user_highpage and clear_user_page on Feroceon
| * more optimally than the generic implementations.
| */
| #include <linux/init.h>
| #include <linux/highmem.h>
|
| static void feroceon_copy_user_page(void *kto, const void *kfrom)
| {
| int tmp;
|
| asm volatile ("\
| 1: ldmia %1!, {r2 - r7, ip, lr} \n\
| pld [%1, #0] \n\
| pld [%1, #32] \n\
| pld [%1, #64] \n\
| pld [%1, #96] \n\
| pld [%1, #128] \n\
| pld [%1, #160] \n\
| pld [%1, #192] \n\
| stmia %0, {r2 - r7, ip, lr} \n\
| ldmia %1!, {r2 - r7, ip, lr} \n\
| mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
| add %0, %0, #32 \n\
| stmia %0, {r2 - r7, ip, lr} \n\
| ldmia %1!, {r2 - r7, ip, lr} \n\
| mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
| add %0, %0, #32 \n\
| stmia %0, {r2 - r7, ip, lr} \n\
| ldmia %1!, {r2 - r7, ip, lr} \n\
| mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
| add %0, %0, #32 \n\
| stmia %0, {r2 - r7, ip, lr} \n\
| ldmia %1!, {r2 - r7, ip, lr} \n\
| mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
| add %0, %0, #32 \n\
| stmia %0, {r2 - r7, ip, lr} \n\
| ldmia %1!, {r2 - r7, ip, lr} \n\
| mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
| add %0, %0, #32 \n\
| stmia %0, {r2 - r7, ip, lr} \n\
| ldmia %1!, {r2 - r7, ip, lr} \n\
| mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
| add %0, %0, #32 \n\
| stmia %0, {r2 - r7, ip, lr} \n\
| ldmia %1!, {r2 - r7, ip, lr} \n\
| mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
| add %0, %0, #32 \n\
| stmia %0, {r2 - r7, ip, lr} \n\
| subs %2, %2, #(32 * 8) \n\
| mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
| add %0, %0, #32 \n\
| bne 1b \n\
| mcr p15, 0, %2, c7, c10, 4 @ drain WB"
| : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
| : "2" (PAGE_SIZE)
| : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
| }
|
| void feroceon_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);
| flush_cache_page(vma, vaddr, page_to_pfn(from));
| feroceon_copy_user_page(kto, kfrom);
| kunmap_atomic(kfrom);
| kunmap_atomic(kto);
| }
|
| void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
| {
| void *ptr, *kaddr = kmap_atomic(page);
| asm volatile ("\
| mov r1, %2 \n\
| mov r2, #0 \n\
| mov r3, #0 \n\
| mov r4, #0 \n\
| mov r5, #0 \n\
| mov r6, #0 \n\
| mov r7, #0 \n\
| mov ip, #0 \n\
| mov lr, #0 \n\
| 1: stmia %0, {r2-r7, ip, lr} \n\
| subs r1, r1, #1 \n\
| mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
| add %0, %0, #32 \n\
| bne 1b \n\
| mcr p15, 0, r1, c7, c10, 4 @ drain WB"
| : "=r" (ptr)
| : "0" (kaddr), "I" (PAGE_SIZE / 32)
| : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
| kunmap_atomic(kaddr);
| }
|
| struct cpu_user_fns feroceon_user_fns __initdata = {
| .cpu_clear_user_highpage = feroceon_clear_user_highpage,
| .cpu_copy_user_highpage = feroceon_copy_user_highpage,
| };
|
|
