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/* * 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> #include <asm/cpufeature.h> #include <asm/alternative.h> /* * Copy a page from src to dest (both are page aligned) * * Parameters: * x0 - dest * x1 - src */ ENTRY(copy_page) alternative_if ARM64_HAS_NO_HW_PREFETCH // Prefetch three cache lines ahead. prfm pldl1strm, [x1, #128] prfm pldl1strm, [x1, #256] prfm pldl1strm, [x1, #384] alternative_else_nop_endif ldp x2, x3, [x1] ldp x4, x5, [x1, #16] ldp x6, x7, [x1, #32] ldp x8, x9, [x1, #48] ldp x10, x11, [x1, #64] ldp x12, x13, [x1, #80] ldp x14, x15, [x1, #96] ldp x16, x17, [x1, #112] mov x18, #(PAGE_SIZE - 128) add x1, x1, #128 1: subs x18, x18, #128 alternative_if ARM64_HAS_NO_HW_PREFETCH prfm pldl1strm, [x1, #384] alternative_else_nop_endif stnp x2, x3, [x0] ldp x2, x3, [x1] stnp x4, x5, [x0, #16] ldp x4, x5, [x1, #16] stnp x6, x7, [x0, #32] ldp x6, x7, [x1, #32] stnp x8, x9, [x0, #48] ldp x8, x9, [x1, #48] stnp x10, x11, [x0, #64] ldp x10, x11, [x1, #64] stnp x12, x13, [x0, #80] ldp x12, x13, [x1, #80] stnp x14, x15, [x0, #96] ldp x14, x15, [x1, #96] stnp x16, x17, [x0, #112] ldp x16, x17, [x1, #112] add x0, x0, #128 add x1, x1, #128 b.gt 1b stnp x2, x3, [x0] stnp x4, x5, [x0, #16] stnp x6, x7, [x0, #32] stnp x8, x9, [x0, #48] stnp x10, x11, [x0, #64] stnp x12, x13, [x0, #80] stnp x14, x15, [x0, #96] stnp x16, x17, [x0, #112] ret ENDPROC(copy_page) |