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From:	"Charles Sandmann" <cwsdpmi AT earthlink DOT net>
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Subject:	Re: freedos and cwsdpmi with djgpp under Linux?
Date:	Mon, 17 Aug 2009 19:51:19 -0500
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> regs.x.ax = 0x0900;  /* Allocate extended memory block */
> regs.x.dx = size_pg_align / XMS_BLOCK;
> __dpmi_simulate_real_mode_procedure_retf(&regs);
>  it fails.  Can anyone shed some light on this?

cwsdpmi allocates the largest XMS memory block available
when it starts up.  If there is only one block, it takes it all.

If you absolutely need an XMS block, you need to
"prepare" for it before running CWSDPMI (such as
allocate the block you need, allocate a second tiny block,
release the first block).

If you need an XMS block for another purpose (such as
a DMA buffer) - consider using DOS memory if it is large
enough, or just using a DJGPP allocated memory block
and using something like the code in
http://clio.rice.edu/djgpp/cwsdma.zip (or cwsdma2.zip,
I don't remember the difference anymore) to get the
physical addresses of the associated memory blocks.

- Raw text -