| /* | |
| * Copyright (c) 2018, Arm Limited. All rights reserved. | |
| * | |
| * SPDX-License-Identifier: BSD-3-Clause | |
| */ | |
| #include <asm_macros.S> | |
| .globl init_spinlock | |
| .globl spin_lock | |
| .globl spin_unlock | |
| func init_spinlock | |
| str wzr, [x0] | |
| ret | |
| endfunc init_spinlock | |
| func spin_lock | |
| mov w2, #1 | |
| sevl | |
| l1: wfe | |
| l2: ldaxr w1, [x0] | |
| cbnz w1, l1 | |
| stxr w1, w2, [x0] | |
| cbnz w1, l2 | |
| ret | |
| endfunc spin_lock | |
| func spin_unlock | |
| stlr wzr, [x0] | |
| ret | |
| endfunc spin_unlock |