| Sandrine Bailleux | 3cd87d7 | 2018-10-09 11:12:55 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2018, Arm Limited. All rights reserved. | ||||
| 3 | * | ||||
| 4 | * SPDX-License-Identifier: BSD-3-Clause | ||||
| 5 | */ | ||||
| 6 | |||||
| 7 | #include <asm_macros.S> | ||||
| 8 | |||||
| 9 | .globl init_spinlock | ||||
| 10 | .globl spin_lock | ||||
| 11 | .globl spin_unlock | ||||
| 12 | |||||
| 13 | func init_spinlock | ||||
| 14 | mov r1, #0 | ||||
| 15 | str r1, [r0] | ||||
| 16 | bx lr | ||||
| 17 | endfunc init_spinlock | ||||
| 18 | |||||
| 19 | func spin_lock | ||||
| 20 | mov r2, #1 | ||||
| 21 | 1: | ||||
| 22 | ldrex r1, [r0] | ||||
| 23 | cmp r1, #0 | ||||
| 24 | wfene | ||||
| 25 | strexeq r1, r2, [r0] | ||||
| 26 | cmpeq r1, #0 | ||||
| 27 | bne 1b | ||||
| 28 | dmb | ||||
| 29 | bx lr | ||||
| 30 | endfunc spin_lock | ||||
| 31 | |||||
| 32 | |||||
| 33 | func spin_unlock | ||||
| 34 | mov r1, #0 | ||||
| 35 | stl r1, [r0] | ||||
| 36 | bx lr | ||||
| 37 | endfunc spin_unlock | ||||