diff options
Diffstat (limited to 'core/arch/arm/kernel/spin_lock_a64.S')
| -rw-r--r-- | core/arch/arm/kernel/spin_lock_a64.S | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/core/arch/arm/kernel/spin_lock_a64.S b/core/arch/arm/kernel/spin_lock_a64.S new file mode 100644 index 0000000..97fce42 --- /dev/null +++ b/core/arch/arm/kernel/spin_lock_a64.S @@ -0,0 +1,89 @@ +/* + * Copyright (c) 2015, Linaro Limited + * 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. + * + * 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. + */ + +/* + * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 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> + +/* void __cpu_spin_lock(unsigned int *lock); */ +FUNC __cpu_spin_lock , : + mov w2, #SPINLOCK_LOCK + sevl +l1: wfe +l2: ldaxr w1, [x0] + cbnz w1, l1 + stxr w1, w2, [x0] + cbnz w1, l2 + ret +END_FUNC __cpu_spin_lock + +/* unsigned int __cpu_spin_trylock(unsigned int *lock); */ +FUNC __cpu_spin_trylock , : + mov x1, x0 + mov w2, #SPINLOCK_LOCK +.loop: ldaxr w0, [x1] + cbnz w0, .cpu_spin_trylock_out + stxr w0, w2, [x1] + cbnz w0, .loop +.cpu_spin_trylock_out: + ret +END_FUNC __cpu_spin_trylock + +/* void __cpu_spin_unlock(unsigned int *lock); */ +FUNC __cpu_spin_unlock , : + stlr wzr, [x0] + ret +END_FUNC __cpu_spin_unlock |