1caab277bSThomas Gleixner/* SPDX-License-Identifier: GPL-2.0-only */ 2f27bb139SMarc Zyngier/* 3f27bb139SMarc Zyngier * Copyright (C) 2012 ARM Ltd. 4f27bb139SMarc Zyngier */ 5f27bb139SMarc Zyngier 6f27bb139SMarc Zyngier#include <linux/linkage.h> 7f27bb139SMarc Zyngier#include <linux/const.h> 8f27bb139SMarc Zyngier#include <asm/assembler.h> 9f27bb139SMarc Zyngier#include <asm/page.h> 10f27bb139SMarc Zyngier 11f27bb139SMarc Zyngier/* 12f27bb139SMarc Zyngier * Clear page @dest 13f27bb139SMarc Zyngier * 14f27bb139SMarc Zyngier * Parameters: 15f27bb139SMarc Zyngier * x0 - dest 16f27bb139SMarc Zyngier */ 17*0f61f6beSMark RutlandSYM_FUNC_START(__pi_clear_page) 18f27bb139SMarc Zyngier mrs x1, dczid_el0 19f0616abdSReiji Watanabe tbnz x1, #4, 2f /* Branch if DC ZVA is prohibited */ 20f27bb139SMarc Zyngier and w1, w1, #0xf 21f27bb139SMarc Zyngier mov x2, #4 22f27bb139SMarc Zyngier lsl x1, x2, x1 23f27bb139SMarc Zyngier 24f27bb139SMarc Zyngier1: dc zva, x0 25f27bb139SMarc Zyngier add x0, x0, x1 26f27bb139SMarc Zyngier tst x0, #(PAGE_SIZE - 1) 27f27bb139SMarc Zyngier b.ne 1b 28f27bb139SMarc Zyngier ret 29f0616abdSReiji Watanabe 30f0616abdSReiji Watanabe2: stnp xzr, xzr, [x0] 31f0616abdSReiji Watanabe stnp xzr, xzr, [x0, #16] 32f0616abdSReiji Watanabe stnp xzr, xzr, [x0, #32] 33f0616abdSReiji Watanabe stnp xzr, xzr, [x0, #48] 34f0616abdSReiji Watanabe add x0, x0, #64 35f0616abdSReiji Watanabe tst x0, #(PAGE_SIZE - 1) 36f0616abdSReiji Watanabe b.ne 2b 37f0616abdSReiji Watanabe ret 38*0f61f6beSMark RutlandSYM_FUNC_END(__pi_clear_page) 39*0f61f6beSMark RutlandSYM_FUNC_ALIAS(clear_page, __pi_clear_page) 4050fdecb2SMark RutlandEXPORT_SYMBOL(clear_page) 41