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cdfce8a055
Add spinlock support for x86_64, needed for SMP Signed-off-by: p-szafonimateusz <p-szafonimateusz@xiaomi.com>
71 lines
2.6 KiB
ArmAsm
71 lines
2.6 KiB
ArmAsm
/****************************************************************************
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* arch/x86/src/intel64/intel64_testset.S
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <arch/spinlock.h>
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.file "intel64_head.S"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/**************************************************************************
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* .text
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**************************************************************************/
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.text
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.code64
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/****************************************************************************
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* Name: up_testset
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*
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* Description:
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* Perform an atomic test and set operation on the provided spinlock.
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*
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* This function must be provided via the architecture-specific logic.
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*
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* Input Parameters:
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* lock - A reference to the spinlock object.
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*
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* Returned Value:
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* The spinlock is always locked upon return. The previous value of the
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* spinlock variable is returned, either SP_LOCKED if the spinlock was
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* previously locked (meaning that the test-and-set operation failed to
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* obtain the lock) or SP_UNLOCKED if the spinlock was previously unlocked
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* (meaning that we successfully obtained the lock).
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*
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****************************************************************************/
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.globl up_testset
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.type up_testset, @function
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up_testset:
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/* Set the value to be written (SP_LOCKED for test-and-set) */
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movq $SP_LOCKED, %rax
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/* Atomic exchange, the old value is returned in rax */
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xchg %rax, (%rdi)
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ret
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