1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /*
3 * linux/arch/arm/lib/copypage-fa.S
4 *
5 * Copyright (C) 2005 Faraday Corp.
6 * Copyright (C) 2008-2009 Paulius Zaleckas <
7 *
8 * Based on copypage-v4wb.S:
9 * Copyright (C) 1995-1999 Russell King
10 */
11 #include <linux/init.h>
12 #include <linux/highmem.h>
13
14 /*
15 * Faraday optimised copy_user_page
16 */
17 static void fa_copy_user_page(void *kto, const
18 {
19 int tmp;
20
21 asm volatile ("\
22 1: ldmia %1!, {r3, r4, ip, lr}
23 stmia %0, {r3, r4, ip, lr}
24 mcr p15, 0, %0, c7, c14, 1
25 add %0, %0, #16
26 ldmia %1!, {r3, r4, ip, lr}
27 stmia %0, {r3, r4, ip, lr}
28 mcr p15, 0, %0, c7, c14, 1
29 add %0, %0, #16
30 subs %2, %2, #1
31 bne 1b
32 mcr p15, 0, %2, c7, c10, 4
33 : "+&r" (kto), "+&r" (kfrom), "=&r" (t
34 : "2" (PAGE_SIZE / 32)
35 : "r3", "r4", "ip", "lr");
36 }
37
38 void fa_copy_user_highpage(struct page *to, st
39 unsigned long vaddr, struct vm_area_st
40 {
41 void *kto, *kfrom;
42
43 kto = kmap_atomic(to);
44 kfrom = kmap_atomic(from);
45 fa_copy_user_page(kto, kfrom);
46 kunmap_atomic(kfrom);
47 kunmap_atomic(kto);
48 }
49
50 /*
51 * Faraday optimised clear_user_page
52 *
53 * Same story as above.
54 */
55 void fa_clear_user_highpage(struct page *page,
56 {
57 void *ptr, *kaddr = kmap_atomic(page);
58 asm volatile("\
59 mov r1, %2
60 mov r2, #0
61 mov r3, #0
62 mov ip, #0
63 mov lr, #0
64 1: stmia %0, {r2, r3, ip, lr}
65 mcr p15, 0, %0, c7, c14, 1
66 add %0, %0, #16
67 stmia %0, {r2, r3, ip, lr}
68 mcr p15, 0, %0, c7, c14, 1
69 add %0, %0, #16
70 subs r1, r1, #1
71 bne 1b
72 mcr p15, 0, r1, c7, c10, 4
73 : "=r" (ptr)
74 : "" (kaddr), "I" (PAGE_SIZE / 32)
75 : "r1", "r2", "r3", "ip", "lr");
76 kunmap_atomic(kaddr);
77 }
78
79 struct cpu_user_fns fa_user_fns __initdata = {
80 .cpu_clear_user_highpage = fa_clear_us
81 .cpu_copy_user_highpage = fa_copy_user
82 };
83
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