How to disable interrupts on win32 with masm32 to use rdtsc instruction

[edkedk]

Hi,

I want to check how many cpu-cycles certain routines i have coded consume, but i _must_ disable all interrupts during this moment, otherwise the rdtsc timestamps are not the real amount of cycles from the routine.

Windows does not like it when i use the "cli" instruction, it closes my win32 app.
What is the best option for me ?

ex.


mainloop:
...
...
<disable interrupts ?>

rdtsc
save dx:ax
call routine
rdtsc
sub dx:ax from saved dx:ax
rdtsc

<enable interrupts again?>

jmp mainloop if not keypressed



I hope someone can help me out.

Thanks for your time!


Bye,

Erik de Keijzer

[Mark Jones]

Hello Erik, in Win32 mode, try Michael's timers.asm or Petrozski's timing routines here:

http://www.masm32.com/board/index.php?topic=770.0

[Ghirai]

Or write a kmd?

[Mark_Larson]

  Someone posted a driver on the old forum that did this.  I'll see if I can find the link.

http://www.oldboard.assemblercode.com/index.php?topic=1762.30

[dioxin]

Erik,
   run your code in Windows 98, it may be scoffed at but it has a much more sensible approach to the user and doesn't try to stop you using CLI/STI.


Paul

[Mark Jones]

I heard that MS is dropping all support for 98/98SE/ME...

[dioxin]

Mark,
  MS may no longer support Win98 but Win98 doesn't stop working because of that.

Paul.

[Mark Jones]

So I wonder, is it more a financial push, the migration to newer versions of Windows?

Or are they trying to distance themselves from older code?