| Marc Zyngier | f27bb13 | 2012-03-05 11:49:33 +0000 | [diff] [blame] | 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) |