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49 lines
1.1 KiB
C++
49 lines
1.1 KiB
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_32.
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*/
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/*
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* Copyright (C) 2013-2017 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 Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__SPEC__X86_32__TRACE__TIMESTAMP_H_
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#define _INCLUDE__SPEC__X86_32__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()
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{
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uint64_t t;
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__asm__ __volatile__ (
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"pushl %%ebx\n\t" /* ebx is reserved in PIC mode, but clobbered by cpuid */
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"xorl %%eax,%%eax\n\t" /* provide constant argument to cpuid to reduce variance */
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"cpuid\n\t" /* synchronise, i.e. finish all preceeding instructions */
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"popl %%ebx\n\t"
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:
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:
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: "%eax", "%ecx", "%edx"
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);
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__asm__ __volatile__ (
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"rdtsc"
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: "=A" (t)
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:
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: "memory" /* prevent reordering of asm statements */
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);
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return t;
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}
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} }
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#endif /* _INCLUDE__SPEC__X86_32__TRACE__TIMESTAMP_H_ */
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