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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 |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
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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
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