Reading model specific registers (MSRs)

[xtknight]

It seems like this should be a fairly straightforward operation. So here is the inline x86 asm code I'm trying. I move 10h (IA32_TIME_STAMP_COUNTER) into the ecx register, which is supposed to be TSC (time stamp counter). Yeah, I know, I could just use rdtsc, but eventually I'm going to read another MSR so I wanted to test it with this first.

Why oh why does it crash? The rdtsc function below it is fine. ReadMSR() crashes right after the 'rdmsr' asm operation is called.

 

[xtknight]

Well, apparently in Windows NT you need to write a kernel-mode driver to access MSRs. In Linux, super-user mode is enough. Does Windows NT expose an API so I can get MSRs?

 

[letdown427]

Bump

About all the help I can offer so far.