1d2912cb1SThomas Gleixner/* SPDX-License-Identifier: GPL-2.0-only */ 2f9076ecfSGeoff Levand/* 3f9076ecfSGeoff Levand * CPU reset routines 4f9076ecfSGeoff Levand * 5f9076ecfSGeoff Levand * Copyright (C) 2001 Deep Blue Solutions Ltd. 6f9076ecfSGeoff Levand * Copyright (C) 2012 ARM Ltd. 7f9076ecfSGeoff Levand * Copyright (C) 2015 Huawei Futurewei Technologies. 8f9076ecfSGeoff Levand */ 9f9076ecfSGeoff Levand 10f9076ecfSGeoff Levand#include <linux/linkage.h> 11f9076ecfSGeoff Levand#include <asm/assembler.h> 12f9076ecfSGeoff Levand#include <asm/sysreg.h> 13f9076ecfSGeoff Levand#include <asm/virt.h> 14f9076ecfSGeoff Levand 15f9076ecfSGeoff Levand.text 16439e70e2SWill Deacon.pushsection .idmap.text, "awx" 17f9076ecfSGeoff Levand 18f9076ecfSGeoff Levand/* 19f9076ecfSGeoff Levand * __cpu_soft_restart(el2_switch, entry, arg0, arg1, arg2) - Helper for 20f9076ecfSGeoff Levand * cpu_soft_restart. 21f9076ecfSGeoff Levand * 224c9e7e64SAKASHI Takahiro * @el2_switch: Flag to indicate a switch to EL2 is needed. 23f9076ecfSGeoff Levand * @entry: Location to jump to for soft reset. 244c9e7e64SAKASHI Takahiro * arg0: First argument passed to @entry. (relocation list) 254c9e7e64SAKASHI Takahiro * arg1: Second argument passed to @entry.(physical kernel entry) 264c9e7e64SAKASHI Takahiro * arg2: Third argument passed to @entry. (physical dtb address) 27f9076ecfSGeoff Levand * 28f9076ecfSGeoff Levand * Put the CPU into the same state as it would be if it had been reset, and 29f9076ecfSGeoff Levand * branch to what would be the reset vector. It must be executed with the 30f9076ecfSGeoff Levand * flat identity mapping. 31f9076ecfSGeoff Levand */ 32f9076ecfSGeoff LevandENTRY(__cpu_soft_restart) 33f9076ecfSGeoff Levand /* Clear sctlr_el1 flags. */ 34f9076ecfSGeoff Levand mrs x12, sctlr_el1 35f9076ecfSGeoff Levand ldr x13, =SCTLR_ELx_FLAGS 36f9076ecfSGeoff Levand bic x12, x12, x13 373060e9f0SShanker Donthineni pre_disable_mmu_workaround 38f9076ecfSGeoff Levand msr sctlr_el1, x12 39f9076ecfSGeoff Levand isb 40f9076ecfSGeoff Levand 41f9076ecfSGeoff Levand cbz x0, 1f // el2_switch? 42f9076ecfSGeoff Levand mov x0, #HVC_SOFT_RESTART 43f9076ecfSGeoff Levand hvc #0 // no return 44f9076ecfSGeoff Levand 45*500d14afSArd Biesheuvel1: mov x8, x1 // entry 46f9076ecfSGeoff Levand mov x0, x2 // arg0 47f9076ecfSGeoff Levand mov x1, x3 // arg1 48f9076ecfSGeoff Levand mov x2, x4 // arg2 49*500d14afSArd Biesheuvel br x8 50f9076ecfSGeoff LevandENDPROC(__cpu_soft_restart) 51f9076ecfSGeoff Levand 52f9076ecfSGeoff Levand.popsection 53