/**
* 타임 스탬프 카운터를 읽음
*/
void kReadTimeStampCounter( const char* pcParameterBuffer )
{
QWORD qwTSC;
qwTSC = kReadTSC();
kPrintf( "Time Stamp Counter = %q\n", qwTSC );
}
/**
* 프로세서의 속도를 측정
*/
static void kMeasureProcessorSpeed( const char* pcParameterBuffer )
{
int i;
QWORD qwLastTSC, qwTotalTSC = 0;
kPrintf( "Now Measuring." );
// 10초 동안 변화한 타임 스탬프 카운터를 이용하여 프로세서의 속도를 간접적으로 측정
kDisableInterrupt();
for( i = 0 ; i < 200 ; i++ )
{
qwLastTSC = kReadTSC();
kWaitUsingDirectPIT( MSTOCOUNT( 50 ) );
qwTotalTSC += kReadTSC() - qwLastTSC;
kPrintf( "." );
}
// 타이머 복원
kInitializePIT( MSTOCOUNT( 1 ), TRUE );
kEnableInterrupt();
kPrintf( "\nCPU Speed = %d MHz\n", qwTotalTSC / 10 / 1000 / 1000 );
}
// Measure the speed of processor
void kMeasureProcessorSpeed( const char * pcParameterBuffer )
{
int i;
QWORD qwLastTSC, qwTotalTSC = 0;
kPrintf( "Now Measuring." );
// For 10 seconds, calculate processor speed by measuring the change of time stamp
kDisableInterrupt();
for ( i = 0 ; i < 200 ; i++ )
{
qwLastTSC = kReadTSC();
kWaitUsingDirectPIT( MSTOCOUNT( 50 ) );
qwTotalTSC += kReadTSC() - qwLastTSC;
kPrintf( "." );
}
// Restore timer
kInitializePIT( MSTOCOUNT( 1 ), TRUE );
kEnableInterrupt();
kPrintf( "\nCPU Speed = %d MHz\n", qwTotalTSC / 10 / 1000 / 1000 );
}