| /* | |
| * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. | |
| * | |
| * SPDX-License-Identifier: BSD-3-Clause | |
| */ | |
| #include <asm_macros.S> | |
| .globl spin_lock | |
| .globl spin_unlock | |
| func spin_lock | |
| mov r2, #1 | |
| 1: | |
| ldrex r1, [r0] | |
| cmp r1, #0 | |
| wfene | |
| strexeq r1, r2, [r0] | |
| cmpeq r1, #0 | |
| bne 1b | |
| dmb | |
| bx lr | |
| endfunc spin_lock | |
| func spin_unlock | |
| mov r1, #0 | |
| stl r1, [r0] | |
| bx lr | |
| endfunc spin_unlock |