| /* | |
| * Copyright (C) 2012 ARM Ltd. | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License version 2 as | |
| * published by the Free Software Foundation. | |
| * | |
| * This program is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| * GNU General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU General Public License | |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| */ | |
| #include <linux/linkage.h> | |
| #include <linux/const.h> | |
| #include <asm/assembler.h> | |
| #include <asm/page.h> | |
| /* | |
| * Clear page @dest | |
| * | |
| * Parameters: | |
| * x0 - dest | |
| */ | |
| ENTRY(clear_page) | |
| mrs x1, dczid_el0 | |
| and w1, w1, #0xf | |
| mov x2, #4 | |
| lsl x1, x2, x1 | |
| 1: dc zva, x0 | |
| add x0, x0, x1 | |
| tst x0, #(PAGE_SIZE - 1) | |
| b.ne 1b | |
| ret | |
| ENDPROC(clear_page) |