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f27bb139 MZ |
1 | /* |
2 | * Copyright (C) 2012 ARM Ltd. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | ||
17 | #include <linux/linkage.h> | |
18 | #include <linux/const.h> | |
19 | #include <asm/assembler.h> | |
20 | #include <asm/page.h> | |
21 | ||
22 | /* | |
23 | * Copy a page from src to dest (both are page aligned) | |
24 | * | |
25 | * Parameters: | |
26 | * x0 - dest | |
27 | * x1 - src | |
28 | */ | |
29 | ENTRY(copy_page) | |
30 | /* Assume cache line size is 64 bytes. */ | |
31 | prfm pldl1strm, [x1, #64] | |
32 | 1: ldp x2, x3, [x1] | |
33 | ldp x4, x5, [x1, #16] | |
34 | ldp x6, x7, [x1, #32] | |
35 | ldp x8, x9, [x1, #48] | |
36 | add x1, x1, #64 | |
37 | prfm pldl1strm, [x1, #64] | |
38 | stnp x2, x3, [x0] | |
39 | stnp x4, x5, [x0, #16] | |
40 | stnp x6, x7, [x0, #32] | |
41 | stnp x8, x9, [x0, #48] | |
42 | add x0, x0, #64 | |
43 | tst x1, #(PAGE_SIZE - 1) | |
44 | b.ne 1b | |
45 | ret | |
46 | ENDPROC(copy_page) |