genode/os/include/x86_64/trace/timestamp.h
2013-08-15 09:22:50 +02:00

45 lines
874 B
C++

/*
* \brief Trace timestamp
* \author Josef Soentgen
* \date 2013-02-12
*
* Serialized reading of tsc on x86_64.
*/
/*
* Copyright (C) 2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__TRACE_TIMESTAMP_H_
#define _INCLUDE__TRACE_TIMESTAMP_H_
#include <base/fixed_stdint.h>
namespace Genode { namespace Trace {
typedef uint64_t Timestamp;
inline Timestamp timestamp() __attribute((always_inline));
inline Timestamp timestamp()
{
uint32_t lo, hi;
__asm__ __volatile__ (
"xorl %%eax,%%eax\n\t"
"cpuid\n\t"
:
:
: "%rax", "%rbx", "%rcx", "%rdx"
);
__asm__ __volatile__ (
"rdtsc" : "=a" (lo), "=d" (hi)
);
return (uint64_t)hi << 32 | lo;
}
} }
#endif /* _INCLUDE__TRACE_TIMESTAMP_H_ */