On Fri, 10 Jan 2003 18:38:07 +0100 (CET), Daniela Engert wrote:
>>> Memory objects in this so called linear address
>>>space are addressable from any context by means of
>>>the DOS32FLATDS selector;
>>Are you sure ? AFAIK, DOS32FLATDS requires the code to
>>run at ring 0. I seem to remember, that I had to move some
>>INIT code to INITCOMPLETE in order to use this approach.
>I've checked this in detail now: DOS32FLATDS may be used at INIT time
>of DEVICEs as well. 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). There is no mapping to any GDT selector
>anywhere just plain flat addressing. This change not only makes the
>driver much easier and more concise, but rather stops it from its
>annoying tendency of failing to allocate large chunks of physically
>contiguous memory :-)
This means that OS/2 will remap the selector at INIT time.
Anyway, this would also mean that OS/2 will remap on any Open/Close/IOCTL/etc done by
the INIT driver. If
it's working, good. I'm just working on USB for Rexx and will continue on GCONFIG in 1
or 2 days. (this means
rewriting again, argghh)
cu, Kiewitz
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