| Soby Mathew | 748be1d | 2016-05-05 14:10:46 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. | ||||
| 3 | * | ||||
| dp-arm | fa3cf0b | 2017-05-03 09:38:09 +0100 | [diff] [blame] | 4 | * SPDX-License-Identifier: BSD-3-Clause |
| Soby Mathew | 748be1d | 2016-05-05 14:10:46 +0100 | [diff] [blame] | 5 | */ |
| 6 | |||||
| 7 | #include <asm_macros.S> | ||||
| 8 | |||||
| 9 | .globl spin_lock | ||||
| 10 | .globl spin_unlock | ||||
| 11 | |||||
| 12 | |||||
| 13 | func spin_lock | ||||
| 14 | mov r2, #1 | ||||
| 15 | 1: | ||||
| 16 | ldrex r1, [r0] | ||||
| 17 | cmp r1, #0 | ||||
| 18 | wfene | ||||
| 19 | strexeq r1, r2, [r0] | ||||
| 20 | cmpeq r1, #0 | ||||
| 21 | bne 1b | ||||
| 22 | dmb | ||||
| 23 | bx lr | ||||
| 24 | endfunc spin_lock | ||||
| 25 | |||||
| 26 | |||||
| 27 | func spin_unlock | ||||
| 28 | mov r1, #0 | ||||
| 29 | stl r1, [r0] | ||||
| 30 | bx lr | ||||
| 31 | endfunc spin_unlock | ||||