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 ldp x2, x3, [x1] 31 ldp x4, x5, [x1, #16] 32 ldp x6, x7, [x1, #32] 33 ldp x8, x9, [x1, #48] 34 ldp x10, x11, [x1, #64] 35 ldp x12, x13, [x1, #80] 36 ldp x14, x15, [x1, #96] 37 ldp x16, x17, [x1, #112] 38 39 mov x18, #(PAGE_SIZE - 128) 40 add x1, x1, #128 411: 42 subs x18, x18, #128 43 44 stnp x2, x3, [x0] 45 ldp x2, x3, [x1] 46 stnp x4, x5, [x0, #16] 47 ldp x4, x5, [x1, #16] 48 stnp x6, x7, [x0, #32] 49 ldp x6, x7, [x1, #32] 50 stnp x8, x9, [x0, #48] 51 ldp x8, x9, [x1, #48] 52 stnp x10, x11, [x0, #64] 53 ldp x10, x11, [x1, #64] 54 stnp x12, x13, [x0, #80] 55 ldp x12, x13, [x1, #80] 56 stnp x14, x15, [x0, #96] 57 ldp x14, x15, [x1, #96] 58 stnp x16, x17, [x0, #112] 59 ldp x16, x17, [x1, #112] 60 61 add x0, x0, #128 62 add x1, x1, #128 63 64 b.gt 1b 65 66 stnp x2, x3, [x0] 67 stnp x4, x5, [x0, #16] 68 stnp x6, x7, [x0, #32] 69 stnp x8, x9, [x0, #48] 70 stnp x10, x11, [x0, #64] 71 stnp x12, x13, [x0, #80] 72 stnp x14, x15, [x0, #96] 73 stnp x16, x17, [x0, #112] 74 75 ret 76ENDPROC(copy_page) 77