/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2012 ARM Ltd. */ #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 */ SYM_FUNC_START_PI(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] add x0, x0, #256 add x1, x1, #128 1: tst x0, #(PAGE_SIZE - 1) alternative_if ARM64_HAS_NO_HW_PREFETCH prfm pldl1strm, [x1, #384] alternative_else_nop_endif stnp x2, x3, [x0, #-256] ldp x2, x3, [x1] stnp x4, x5, [x0, #16 - 256] ldp x4, x5, [x1, #16] stnp x6, x7, [x0, #32 - 256] ldp x6, x7, [x1, #32] stnp x8, x9, [x0, #48 - 256] ldp x8, x9, [x1, #48] stnp x10, x11, [x0, #64 - 256] ldp x10, x11, [x1, #64] stnp x12, x13, [x0, #80 - 256] ldp x12, x13, [x1, #80] stnp x14, x15, [x0, #96 - 256] ldp x14, x15, [x1, #96] stnp x16, x17, [x0, #112 - 256] ldp x16, x17, [x1, #112] add x0, x0, #128 add x1, x1, #128 b.ne 1b stnp x2, x3, [x0, #-256] stnp x4, x5, [x0, #16 - 256] stnp x6, x7, [x0, #32 - 256] stnp x8, x9, [x0, #48 - 256] stnp x10, x11, [x0, #64 - 256] stnp x12, x13, [x0, #80 - 256] stnp x14, x15, [x0, #96 - 256] stnp x16, x17, [x0, #112 - 256] ret SYM_FUNC_END_PI(copy_page) EXPORT_SYMBOL(copy_page)