Yaya48
cf256aa081
Upstream: https://gitlab.com/qemu-project/qemu.git Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475
26 lines
665 B
C
26 lines
665 B
C
/*
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* Copyright (C) 2016, Emilio G. Cota <[email protected]>
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*
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* License: GNU GPL, version 2.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_PROCESSOR_H
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#define QEMU_PROCESSOR_H
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#if defined(__x86_64__)
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# define cpu_relax() asm volatile("rep; nop" ::: "memory")
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#elif defined(__aarch64__)
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# define cpu_relax() asm volatile("yield" ::: "memory")
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#elif defined(__powerpc64__)
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/* set Hardware Multi-Threading (HMT) priority to low; then back to medium */
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# define cpu_relax() asm volatile("or 1, 1, 1;" \
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"or 2, 2, 2;" ::: "memory")
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#else
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# define cpu_relax() barrier()
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#endif
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#endif /* QEMU_PROCESSOR_H */
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