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Signed-off-by: humzak711 <humzak711@gmail.com> This commit defines the UP_WFE() macro as the 'pause' instruction for x86_64. This optimization reduces power consumption and prevents pipeline flushes caused by memory ordering violations during contended spinlock acqusitions
34 lines
1.6 KiB
C
34 lines
1.6 KiB
C
/****************************************************************************
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* arch/x86_64/include/barriers.h
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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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#ifndef __ARCH_X86_64_INCLUDE_BARRIERS_H
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#define __ARCH_X86_64_INCLUDE_BARRIERS_H
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define UP_DSB() __asm__ __volatile__ ("mfence")
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#define UP_DMB() __asm__ __volatile__ ("mfence" ::: "memory")
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#define UP_RMB() __asm__ __volatile__ ("lfence" ::: "memory")
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#define UP_WMB() __asm__ __volatile__ ("sfence" ::: "memory")
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#define UP_WFE() __asm__ __volatile__ ("pause")
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#endif /* __ARCH_X86_64_INCLUDE_BARRIERS_H */
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