| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * CPU reset routines |
| * |
| * Copyright (C) 2001 Deep Blue Solutions Ltd. |
| * Copyright (C) 2012 ARM Ltd. |
| * Copyright (C) 2015 Huawei Futurewei Technologies. |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| #include <asm/sysreg.h> |
| #include <asm/virt.h> |
| |
| .text |
| .pushsection .idmap.text, "awx" |
| |
| /* |
| * __cpu_soft_restart(el2_switch, entry, arg0, arg1, arg2) - Helper for |
| * cpu_soft_restart. |
| * |
| * @el2_switch: Flag to indicate a switch to EL2 is needed. |
| * @entry: Location to jump to for soft reset. |
| * arg0: First argument passed to @entry. (relocation list) |
| * arg1: Second argument passed to @entry.(physical kernel entry) |
| * arg2: Third argument passed to @entry. (physical dtb address) |
| * |
| * Put the CPU into the same state as it would be if it had been reset, and |
| * branch to what would be the reset vector. It must be executed with the |
| * flat identity mapping. |
| */ |
| SYM_CODE_START(__cpu_soft_restart) |
| /* Clear sctlr_el1 flags. */ |
| mrs x12, sctlr_el1 |
| mov_q x13, SCTLR_ELx_FLAGS |
| bic x12, x12, x13 |
| pre_disable_mmu_workaround |
| msr sctlr_el1, x12 |
| isb |
| |
| cbz x0, 1f // el2_switch? |
| mov x0, #HVC_SOFT_RESTART |
| hvc #0 // no return |
| |
| 1: mov x8, x1 // entry |
| mov x0, x2 // arg0 |
| mov x1, x3 // arg1 |
| mov x2, x4 // arg2 |
| br x8 |
| SYM_CODE_END(__cpu_soft_restart) |
| |
| .popsection |
