Geoff Levand | f9076ec | 2016-06-23 17:54:48 +0000 | [diff] [blame] | 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, "ax" |
| 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 swich to EL2 is needed. |
| 26 | * @entry: Location to jump to for soft reset. |
| 27 | * arg0: First argument passed to @entry. |
| 28 | * arg1: Second argument passed to @entry. |
| 29 | * arg2: Third argument passed to @entry. |
| 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 | */ |
| 35 | ENTRY(__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 | msr sctlr_el1, x12 |
| 41 | isb |
| 42 | |
| 43 | cbz x0, 1f // el2_switch? |
| 44 | mov x0, #HVC_SOFT_RESTART |
| 45 | hvc #0 // no return |
| 46 | |
| 47 | 1: mov x18, x1 // entry |
| 48 | mov x0, x2 // arg0 |
| 49 | mov x1, x3 // arg1 |
| 50 | mov x2, x4 // arg2 |
| 51 | br x18 |
| 52 | ENDPROC(__cpu_soft_restart) |
| 53 | |
| 54 | .popsection |