31 lines
655 B
C++
31 lines
655 B
C++
/*
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* \brief Read time-stamp counter
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* \author Norman Feske
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* \date 2008-11-29
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*/
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/*
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* Copyright (C) 2008-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__X86__CPU__RDTSC_H_
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#define _INCLUDE__X86__CPU__RDTSC_H_
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#include <base/clock.h>
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namespace Genode {
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static inline cycles_t rdtsc()
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{
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uint32_t lo, hi;
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/* We cannot use "=A", since this would use %rax on x86_64 */
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__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
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return (uint64_t)hi << 32 | lo;
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}
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}
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#endif /* _INCLUDE__X86__CPU__RDTSC_H_ */
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