typedef unsigned short ushort;
typedef unsigned char uchar;

ushort inport( ushort portid )
 {
  _DX = portid;
  __emit__( 0x66, 0xED );
  return _AX;
 }

void outport( ushort portid, ushort data )
 {
  _DX = portid;
  _AX = data;
  __emit__( 0x66, 0xEF );
 }

uchar inportb( ushort portid )
 {
  _DX = portid;
  __emit__( 0xEC );
  return _AL;
 }

void outportb( ushort portid, uchar data )
 {
  _DX = portid;
  _AL = data;
  __emit__( 0xEE ); }

void cli( void )
{
 __emit__( 0xFA );
}

void sti( void )
{
 __emit__( 0xFB );
}

#else
#error NOT FLAT memory model
#endif
请教高手，为何在运行时错误总指向上述红色代码。急...！在线等...

thread stopped C:\Docments and Settings\Administrator\桌面\BBD.NEW\AC_MDI.exe:Fault:privileged instruction at 0x4019ba