[NTVDM]: Partial revert to r67234: delays were in fact better than frequencies, in...

[reactos.git] / reactos / subsystems / mvdm / ntvdm / clock.h

diff --git a/reactos/subsystems/mvdm/ntvdm/clock.h b/reactos/subsystems/mvdm/ntvdm/clock.h
index 65111c5..fb48cd4 100644 (file)
--- a/reactos/subsystems/mvdm/ntvdm/clock.h
+++ b/reactos/subsystems/mvdm/ntvdm/clock.h
@@ -18,6 +18,9 @@
 #define HARDWARE_TIMER_ONESHOT (1 << 1)
 #define HARDWARE_TIMER_PRECISE (1 << 2)
 
+/* Converts a frequency in Hertz into a duration in nanoseconds */
+#define HZ_TO_NS(Freq) (ULONGLONG)(1000000000ULL / (ULONGLONG)(Freq))
+
 typedef VOID (FASTCALL *PHARDWARE_TIMER_PROC)(ULONGLONG ElapsedTime);
 
 typedef struct _HARDWARE_TIMER
@@ -35,7 +38,7 @@ typedef struct _HARDWARE_TIMER
 PHARDWARE_TIMER CreateHardwareTimer
 (
     ULONG Flags,
-    ULONG Frequency, // in Hz
+    ULONGLONG Delay, /* nanoseconds */
     PHARDWARE_TIMER_PROC Callback
 );
 VOID EnableHardwareTimer(PHARDWARE_TIMER Timer);