1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * CPU reset routines 4 * 5 * Copyright (C) 2001 Deep Blue Solutions Ltd. 6 * Copyright (C) 2012 ARM Ltd. 7 * Copyright (C) 2015 Huawei Futurewei Technologies. 8 */ 9 10#include <linux/linkage.h> 11#include <asm/assembler.h> 12#include <asm/sysreg.h> 13#include <asm/virt.h> 14 15.text 16.pushsection .idmap.text, "awx" 17 18/* 19 * __cpu_soft_restart(el2_switch, entry, arg0, arg1, arg2) - Helper for 20 * cpu_soft_restart. 21 * 22 * @el2_switch: Flag to indicate a switch to EL2 is needed. 23 * @entry: Location to jump to for soft reset. 24 * arg0: First argument passed to @entry. (relocation list) 25 * arg1: Second argument passed to @entry.(physical kernel entry) 26 * arg2: Third argument passed to @entry. (physical dtb address) 27 * 28 * Put the CPU into the same state as it would be if it had been reset, and 29 * branch to what would be the reset vector. It must be executed with the 30 * flat identity mapping. 31 */ 32ENTRY(__cpu_soft_restart) 33 /* Clear sctlr_el1 flags. */ 34 mrs x12, sctlr_el1 35 ldr x13, =SCTLR_ELx_FLAGS 36 bic x12, x12, x13 37 pre_disable_mmu_workaround 38 msr sctlr_el1, x12 39 isb 40 41 cbz x0, 1f // el2_switch? 42 mov x0, #HVC_SOFT_RESTART 43 hvc #0 // no return 44 451: mov x18, x1 // entry 46 mov x0, x2 // arg0 47 mov x1, x3 // arg1 48 mov x2, x4 // arg2 49 br x18 50ENDPROC(__cpu_soft_restart) 51 52.popsection 53