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45 lines
874 B
C++
45 lines
874 B
C++
/*
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* \brief Trace timestamp
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* \author Josef Soentgen
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* \date 2013-02-12
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*
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* Serialized reading of tsc on x86_64.
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*/
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/*
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* Copyright (C) 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__TRACE_TIMESTAMP_H_
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#define _INCLUDE__TRACE_TIMESTAMP_H_
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#include <base/fixed_stdint.h>
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namespace Genode { namespace Trace {
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typedef uint64_t Timestamp;
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inline Timestamp timestamp() __attribute((always_inline));
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inline Timestamp timestamp()
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{
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uint32_t lo, hi;
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__asm__ __volatile__ (
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"xorl %%eax,%%eax\n\t"
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"cpuid\n\t"
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:
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:
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: "%rax", "%rbx", "%rcx", "%rdx"
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);
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__asm__ __volatile__ (
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"rdtsc" : "=a" (lo), "=d" (hi)
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);
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return (uint64_t)hi << 32 | lo;
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}
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} }
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#endif /* _INCLUDE__TRACE_TIMESTAMP_H_ */
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