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Checking for RDTSC support

Posted on 1998-01-02
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Last Modified: 2013-12-03
Is there a quick check you can do to find out if the RDTSC (time stamp)
instruction
is supported on the particular CPU that you're running on?

I know you can back this out by doing a bunch of tests to see what brand
and model
CPU you have, and then figuring out from that info if the RDTSC
instruction is supported,
but I'm hoping to have a simpler runtime check that doesn't require us
to keep track
of every CPU brand and model.

Currently if you execute the RDTSC on cpu's that don't support it, Win95
pops up a
box about an illegal instruction. Is there some way you can attempt to
execute the
RDTSC and then catch the fact that its not supported before Win95 gets
upset
about it? If so, will this work on NT also?

Thanks for any help you can give me-
Paul Titchener

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Question by:titchener
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by:
Arkadiy earned 300 total points
ID: 1409811
You probably should use structured exceptions. Something like this:
BOOL bCommandAccessible = TRUE;
__try
{
   asm{RDTSC ...}
}
__except(1)
{
  //the command is not accessible
  bCommandAccessible = FALSE;
  ASSERT(_exception_code() == 6); //6 means invalid instruction
}

That code applies to Visual C++. If you use something els, see help on _structured_ (not C++) exception handling.
P.S. I never tried this code to catch a bad command exception. I use it mostly for code 5 (GPF)
0
 

Author Comment

by:titchener
ID: 1409812
I didn't try the suggested approach in the answer yet, but
it makes sense and looks like it will probably work well.

Thanks,

Paul Titchener
0

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