| /* SPDX-License-Identifier: BSD-3-Clause */ |
| /* |
| * Copyright (c) 2016, Linaro Limited |
| * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. |
| * Copyright (c) 2014, STMicroelectronics International N.V. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * Neither the name of ARM nor the names of its contributors may be used |
| * to endorse or promote products derived from this software without specific |
| * prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <asm.S> |
| #include <kernel/spinlock.h> |
| #include <kernel/unwind.h> |
| |
| /* void __cpu_spin_lock(unsigned int *lock) */ |
| FUNC __cpu_spin_lock , : |
| UNWIND( .fnstart) |
| mov r2, #SPINLOCK_LOCK |
| 1: |
| ldrex r1, [r0] |
| cmp r1, #SPINLOCK_UNLOCK |
| wfene |
| strexeq r1, r2, [r0] |
| cmpeq r1, #0 |
| bne 1b |
| dmb |
| bx lr |
| UNWIND( .fnend) |
| END_FUNC __cpu_spin_lock |
| |
| /* int __cpu_spin_trylock(unsigned int *lock) - return 0 on success */ |
| FUNC __cpu_spin_trylock , : |
| UNWIND( .fnstart) |
| mov r2, #SPINLOCK_LOCK |
| mov r1, r0 |
| 1: |
| ldrex r0, [r1] |
| cmp r0, #0 |
| bne 1f |
| strex r0, r2, [r1] |
| cmp r0, #0 |
| bne 1b |
| dmb |
| bx lr |
| 1: |
| clrex |
| dmb |
| bx lr |
| UNWIND( .fnend) |
| END_FUNC __cpu_spin_trylock |
| |
| /* void __cpu_spin_unlock(unsigned int *lock) */ |
| FUNC __cpu_spin_unlock , : |
| UNWIND( .fnstart) |
| dmb |
| mov r1, #SPINLOCK_UNLOCK |
| str r1, [r0] |
| dsb |
| sev |
| bx lr |
| UNWIND( .fnend) |
| END_FUNC __cpu_spin_unlock |
