VTDAPI_Start_User_Timer

; Obtain the entry point address in VTDAPI_Addr
mov di, SEG TimerParams
mov es, di
mov bx, OFFSET TimerParams
mov ax, VTDAPI_Start_User_Timer
call VTDAPI_Addr

mov word ptr [Timer_ID+2], dx
mov word ptr [Timer_ID], ax
 

Starts the timer and register a timer callback to be called at periodic intervals. Limited to 32 timers.

• Returns a 32-bit handle to the timer.

TimerParams

Address of VTDAPI_Timer_Parameters structure.