/**
* PIT 컨트롤러를 직접 사용하여 ms 동안 대기
*/
void kWaitUsingPIT( const char* pcParameterBuffer )
{
char vcParameter[ 100 ];
int iLength;
PARAMETERLIST stList;
long lMillisecond;
int i;
// 파라미터 초기화
kInitializeParameter( &stList, pcParameterBuffer );
if( kGetNextParameter( &stList, vcParameter ) == 0 )
{
kPrintf( "ex)wait 100(ms)\n" );
return ;
}
lMillisecond = kAToI( pcParameterBuffer, 10 );
kPrintf( "%d ms Sleep Start...\n", lMillisecond );
// 인터럽트를 비활성화하고 PIT 컨트롤러를 통해 직접 시간을 측정
kDisableInterrupt();
for( i = 0 ; i < lMillisecond / 30 ; i++ )
{
kWaitUsingDirectPIT( MSTOCOUNT( 30 ) );
}
kWaitUsingDirectPIT( MSTOCOUNT( lMillisecond % 30 ) );
kEnableInterrupt();
kPrintf( "%d ms Sleep Complete\n", lMillisecond );
// 타이머 복원
kInitializePIT( MSTOCOUNT( 1 ), TRUE );
}
// Wait for ms by PIT controller
void kWaitUsingPIT( const char * pcParameterBuffer )
{
char vcParameter[100];
int iLength;
PARAMETERLIST stList;
long lMillisecond;
int i;
// Initialize parameter
kInitializeParameter( &stList, pcParameterBuffer );
if (kGetNextParameter( &stList, vcParameter ) == 0 )
{
kPrintf( "ex) wait 100(ms)\n" );
return;
}
lMillisecond = kAToI( pcParameterBuffer, 10 );
kPrintf( "%d ms Sleep Start...\n", lMillisecond );
// Disable interrupt and measure the time by PIT controller
kDisableInterrupt();
for ( i = 0 ; i < lMillisecond / 30 ; i++ )
{
kWaitUsingDirectPIT( MSTOCOUNT( 30 ) );
}
kWaitUsingDirectPIT( MSTOCOUNT( lMillisecond % 30 ) );
kEnableInterrupt();
kPrintf( "%d ms Sleep Complete\n", lMillisecond );
// Restore kSetTimer
kInitializePIT( MSTOCOUNT( 1 ), TRUE );
}
/**
* 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 );
}
