Linux->Nasm->Flush ports

yousafsajjad · 07-09-2010, 04:07 PM

Hi,

I am using the following code to flush port:

in al, 081h
out 081h, al

but it is giving me segmentation fault. Does anyone how I can do it.

TimothyEBaldwin · 07-09-2010, 06:03 PM

That's because the process does not have permission to access to that IO address. On a traditional PC is the ISA DMA controller, so writing to it is dangerous.

What are you trying to do?

yousafsajjad · 07-09-2010, 11:21 PM

yeah you are right .. i am calling an assembly function from C. So I need to get permission to that port using ioperm() first and than it works.