| 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 | str wzr, [x0] | ||||
| 15 | ret | ||||
| 16 | endfunc init_spinlock | ||||
| 17 | |||||
| 18 | func spin_lock | ||||
| 19 | mov w2, #1 | ||||
| 20 | sevl | ||||
| 21 | l1: wfe | ||||
| 22 | l2: ldaxr w1, [x0] | ||||
| 23 | cbnz w1, l1 | ||||
| 24 | stxr w1, w2, [x0] | ||||
| 25 | cbnz w1, l2 | ||||
| 26 | ret | ||||
| 27 | endfunc spin_lock | ||||
| 28 | |||||
| 29 | |||||
| 30 | func spin_unlock | ||||
| 31 | stlr wzr, [x0] | ||||
| 32 | ret | ||||
| 33 | endfunc spin_unlock | ||||