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 */ 29ENTRY(copy_page) 30 /* Assume cache line size is 64 bytes. */ 31 prfm pldl1strm, [x1, #64] 321: 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 46ENDPROC(copy_page) 47