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From:	Martin Str|mberg <ams AT speedy DOT ludd DOT ltu DOT se>
Subject:	Re: 64 bit access under DOS?
Newsgroups:	comp.os.msdos.djgpp
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Date:	12 Sep 2006 18:40:33 GMT
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Ivor Bowden <ivorlist AT peritek DOT com> wrote:
> 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.

I'm not sure if there are any 64-bit wide x86 instructions but the
cmpxchg8.

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

Unfortunately AMD64 instructions are only available in long 64-bit
(non-compatibility) mode and in long mode vm86 mode isn't supported,
so this won't happen.

> Any ideas or tips??

You're probably are out of luck.


Right,

						MartinS

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