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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 | * Clear page @dest | |
24 | * | |
25 | * Parameters: | |
26 | * x0 - dest | |
27 | */ | |
28 | ENTRY(clear_page) | |
29 | mrs x1, dczid_el0 | |
30 | and w1, w1, #0xf | |
31 | mov x2, #4 | |
32 | lsl x1, x2, x1 | |
33 | ||
34 | 1: dc zva, x0 | |
35 | add x0, x0, x1 | |
36 | tst x0, #(PAGE_SIZE - 1) | |
37 | b.ne 1b | |
38 | ret | |
39 | ENDPROC(clear_page) |