64 bit access under DOS?

Hi,

I have written a useful hardware debugging utility using the djgpp compiler, available at http://www.cwcgraphics.com/software_peritool.html .. It only runs under DOS, Linux and VxWorks - Not Windows 98SE or above.

I would like the memory test to function in 64 bit mode on the PCI bus for hardware that supports it. Currently I am using the _farpeek and _farpoke routines, after mapping in the physical address, and can test byte, word and long accesses.

I have test hardware that I know supports 64 bit accesses, because I can see them on the logic analyzer when running certain Windows operations.

I could use something like _farpeekll / _farpokell (long long). I'm not sure what else I would need to do to set up the system for these kind of accesses.

The other thought I had was to set up some assembly routines to use the AMD64 instructions.

Any ideas or tips??

Thanks,

Ivor Bowden


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