reactos/subsystems/mvdm/ntvdm/clock.h

   1 /*
   2  * COPYRIGHT:       GPL - See COPYING in the top level directory
   3  * PROJECT:         ReactOS Virtual DOS Machine
   4  * FILE:            subsystems/mvdm/ntvdm/clock.h
   5  * PURPOSE:         Clock for VDM
   6  * PROGRAMMERS:     Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
   7  *                  Hermes Belusca-Maito (hermes.belusca@sfr.fr)
   8  */
   9
  10 #ifndef _CLOCK_H_
  11 #define _CLOCK_H_
  12
  13 /* DEFINITIONS ****************************************************************/
  14
  15 #define HARDWARE_TIMER_ENABLED (1 << 0)
  16 #define HARDWARE_TIMER_ONESHOT (1 << 1)
  17 #define HARDWARE_TIMER_PRECISE (1 << 2)
  18
  19 /* Converts a frequency in Hertz into a duration in nanoseconds */
  20 #define HZ_TO_NS(Freq) (ULONGLONG)(1000000000ULL / (ULONGLONG)(Freq))
  21
  22 typedef VOID (FASTCALL *PHARDWARE_TIMER_PROC)(ULONGLONG ElapsedTime);
  23
  24 typedef struct _HARDWARE_TIMER
  25 {
  26     LIST_ENTRY Link;
  27     ULONG Flags;
  28     LONG EnableCount;
  29     ULONGLONG Delay;
  30     LARGE_INTEGER LastTick;
  31     PHARDWARE_TIMER_PROC Callback;
  32 } HARDWARE_TIMER, *PHARDWARE_TIMER;
  33
  34 /* FUNCTIONS ******************************************************************/
  35
  36 PHARDWARE_TIMER CreateHardwareTimer
  37 (
  38     ULONG Flags,
  39     ULONGLONG Delay, /* nanoseconds */
  40     PHARDWARE_TIMER_PROC Callback
  41 );
  42 VOID EnableHardwareTimer(PHARDWARE_TIMER Timer);
  43 VOID DisableHardwareTimer(PHARDWARE_TIMER Timer);
  44 VOID SetHardwareTimerDelay(PHARDWARE_TIMER Timer, ULONGLONG NewDelay);
  45 VOID DestroyHardwareTimer(PHARDWARE_TIMER Timer);
  46
  47 ULONGLONG GetCycleCount(VOID);
  48 ULONGLONG GetCycleSpeed(VOID);
  49
  50 VOID ClockUpdate(VOID);
  51 BOOLEAN ClockInitialize(VOID);
  52
  53 #endif // _CLOCK_H_
  54
  55 /* EOF */