50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef VDSO_BARRIER_H_
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#define VDSO_BARRIER_H_
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namespace vdso {
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// Compiler Optimization barrier.
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inline void barrier(void) { __asm__ __volatile__("" ::: "memory"); }
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#if __x86_64__
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inline void memory_barrier(void) {
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__asm__ __volatile__("mfence" ::: "memory");
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}
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inline void read_barrier(void) { barrier(); }
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inline void write_barrier(void) { barrier(); }
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#elif __aarch64__
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inline void memory_barrier(void) {
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__asm__ __volatile__("dmb ish" ::: "memory");
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}
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inline void read_barrier(void) {
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__asm__ __volatile__("dmb ishld" ::: "memory");
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}
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inline void write_barrier(void) {
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__asm__ __volatile__("dmb ishst" ::: "memory");
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}
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#else
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#error "unsupported architecture"
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#endif
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} // namespace vdso
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#endif // VDSO_BARRIER_H_
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