On 10 Jan 2003 17:38:30 UT, [EMAIL PROTECTED] wrote:
>I've checked this in detail now: DOS32FLATDS may be used
>at INIT time of DEVICEs as well.
You are right ! But my tests here showed, that it will only work for
memory areas that are truly allocated by VMAlloc. I do get strange
results, if the area in question is a mapping of some physical location.
Funny enough, it works for both types of memory when called at task
time. That's why I assumed DOS32FLATDS wouldn't be usable at INIT.
BTW, a while ago I noticed another subtile difference between alloc-
ated and mapped memory regions: VMGlobalToProcess refuses to
work on mapped memory areas. I know, it's a bit off-topic for this list,
but if anyone has an idea why, I'd appreciate...
>As a proof, there is a largely modified (i.e. mostly rewritten) VFDisk.sys
>(virtual floppy driver) now which no longer allocates its memory in
>(contiguous) physical address space>(using AllocPhys) but in linear
>address space (physically discontiguous, using VMAlloc).
I assume, your virtual floppy driver doesn't require the non-virtual pre-
sence of a virtual floppy adapter ;-))).
Cheers
--
Ruediger "Rudi" Ihle
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