1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2012 ARM Ltd.
4 */
5
6 #include <linux/linkage.h>
7 #include <linux/const.h>
8 #include <asm/assembler.h>
9 #include <asm/page.h>
10 #include <asm/cpufeature.h>
11 #include <asm/alternative.h>
12
13 /*
14 * Copy a page from src to dest (both are page
15 *
16 * Parameters:
17 * x0 - dest
18 * x1 - src
19 */
20 SYM_FUNC_START(__pi_copy_page)
21 ldp x2, x3, [x1]
22 ldp x4, x5, [x1, #16]
23 ldp x6, x7, [x1, #32]
24 ldp x8, x9, [x1, #48]
25 ldp x10, x11, [x1, #64]
26 ldp x12, x13, [x1, #80]
27 ldp x14, x15, [x1, #96]
28 ldp x16, x17, [x1, #112]
29
30 add x0, x0, #256
31 add x1, x1, #128
32 1:
33 tst x0, #(PAGE_SIZE - 1)
34
35 stnp x2, x3, [x0, #-256]
36 ldp x2, x3, [x1]
37 stnp x4, x5, [x0, #16 - 256]
38 ldp x4, x5, [x1, #16]
39 stnp x6, x7, [x0, #32 - 256]
40 ldp x6, x7, [x1, #32]
41 stnp x8, x9, [x0, #48 - 256]
42 ldp x8, x9, [x1, #48]
43 stnp x10, x11, [x0, #64 - 256]
44 ldp x10, x11, [x1, #64]
45 stnp x12, x13, [x0, #80 - 256]
46 ldp x12, x13, [x1, #80]
47 stnp x14, x15, [x0, #96 - 256]
48 ldp x14, x15, [x1, #96]
49 stnp x16, x17, [x0, #112 - 256]
50 ldp x16, x17, [x1, #112]
51
52 add x0, x0, #128
53 add x1, x1, #128
54
55 b.ne 1b
56
57 stnp x2, x3, [x0, #-256]
58 stnp x4, x5, [x0, #16 - 256]
59 stnp x6, x7, [x0, #32 - 256]
60 stnp x8, x9, [x0, #48 - 256]
61 stnp x10, x11, [x0, #64 - 256]
62 stnp x12, x13, [x0, #80 - 256]
63 stnp x14, x15, [x0, #96 - 256]
64 stnp x16, x17, [x0, #112 - 256]
65
66 ret
67 SYM_FUNC_END(__pi_copy_page)
68 SYM_FUNC_ALIAS(copy_page, __pi_copy_page)
69 EXPORT_SYMBOL(copy_page)
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