1/* 2 * CPU reset routines 3 * 4 * Copyright (C) 2001 Deep Blue Solutions Ltd. 5 * Copyright (C) 2012 ARM Ltd. 6 * Copyright (C) 2015 Huawei Futurewei Technologies. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13#include <linux/linkage.h> 14#include <asm/assembler.h> 15#include <asm/sysreg.h> 16#include <asm/virt.h> 17 18.text 19.pushsection .idmap.text, "awx" 20 21/* 22 * __cpu_soft_restart(el2_switch, entry, arg0, arg1, arg2) - Helper for 23 * cpu_soft_restart. 24 * 25 * @el2_switch: Flag to indicate a switch to EL2 is needed. 26 * @entry: Location to jump to for soft reset. 27 * arg0: First argument passed to @entry. (relocation list) 28 * arg1: Second argument passed to @entry.(physical kernel entry) 29 * arg2: Third argument passed to @entry. (physical dtb address) 30 * 31 * Put the CPU into the same state as it would be if it had been reset, and 32 * branch to what would be the reset vector. It must be executed with the 33 * flat identity mapping. 34 */ 35ENTRY(__cpu_soft_restart) 36 /* Clear sctlr_el1 flags. */ 37 mrs x12, sctlr_el1 38 ldr x13, =SCTLR_ELx_FLAGS 39 bic x12, x12, x13 40 pre_disable_mmu_workaround 41 msr sctlr_el1, x12 42 isb 43 44 cbz x0, 1f // el2_switch? 45 mov x0, #HVC_SOFT_RESTART 46 hvc #0 // no return 47 481: mov x18, x1 // entry 49 mov x0, x2 // arg0 50 mov x1, x3 // arg1 51 mov x2, x4 // arg2 52 br x18 53ENDPROC(__cpu_soft_restart) 54 55.popsection 56