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 */ 28ENTRY(clear_page) 29 mrs x1, dczid_el0 30 and w1, w1, #0xf 31 mov x2, #4 32 lsl x1, x2, x1 33 341: dc zva, x0 35 add x0, x0, x1 36 tst x0, #(PAGE_SIZE - 1) 37 b.ne 1b 38 ret 39ENDPROC(clear_page) 40EXPORT_SYMBOL(clear_page) 41