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From: "Charles Sandmann" <cwsdpmi AT earthlink DOT net>
Newsgroups: comp.os.msdos.djgpp
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Subject: Re: freedos and cwsdpmi with djgpp under Linux?
Date: Tue, 18 Aug 2009 22:52:42 -0500
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

>> Allocated 8M DMA buffer at DJGPP address 0x93b00, physical 0x113b00
>> Virtual: 0x1000  Physical: 0x100000  Size: 0x13000
>> Virtual: 0x91000  Physical: 0x916000  Size: 0x1000
>> Virtual: 0x92000  Physical: 0x914000  Size: 0x1000
>> Virtual: 0x93000  Physical: 0x113000  Size: 0x1000
>> Virtual: 0x94000  Physical: 0x115000  Size: 0x7ff000
>> Virtual: 0x893000  Physical: 0x114000  Size: 0x1000
>> Virtual: 0x897000  Physical: 0x915000  Size: 0x1000
>>
>>  Looking at the Physical address, it's apparent that they are not
>> contiguous.  If I used XMS would I get a contiguous one?

Wait a second here ... Note the text allocated 8MB buffer @ 93b00
The rest of the virtual/physical descriptions are for most of
the rest of your image (0x13000 at start of memory, some
stack at 0x916000, expanding down, some malloc increase at
0x113000).  So expecting that you want 4KB aligned memory,
allocating 8MB, then rounding up to nearest 4MB page
0x94000 - you get 4MB - 4KB of buffer to play with.
(the other strangeness in memory layout has to deal with
sbrk setting boundaries around the memory block).

So it appears you have the 1MB buffer you need here.