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From: "Cristiano" <cristiano DOT pi AT NSquipo DOT it>
Newsgroups: comp.os.msdos.djgpp
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Subject: Re: Reading the TSC
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Date: 16 Jan 2006 22:06:42 +0100
To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Rod Pemberton wrote:
> "Cristiano" <cristiano DOT pi AT NSquipo DOT it> wrote in message
> news:43cbed4a_1 AT x-privat DOT org...
>> I'm trying to write the Pentium time-stamp counter in a file under
>> MSDOS. DJGPP says that there is a parsing error. Please, could
>> somebody help me?
>>
> <snip>
>
>> Thanks
>> Cristiano
>
> I think this is more of what you want:
>
> #include <stdio.h>
>
> #define RDTSC(x) __asm__ __volatile__ ("rdtsc":"=A"(x));

Now it says that rdtsc is not a 386 instruction. Is there any flag to set?

> [...]. I didn't need to change the DPMI host to CWSDPR0
> which means the TSD CR4 bit is correct RM dos.  If you are under XP,
> etc., you may need to fixup CR4.

That's all double dutch to me. :-) I installed DJGPP 3 hours ago. :-)
Anyway, I should run that small program under pure DOS.

> There is a long thread on rdtsc by
> AL SANTINO 1/7/06 6:31PM in comp.lang.asm.x86.  It recommends the
> 'cpuid' instruction be thrown in there too.

I seen that thread, thank you.

Cristiano