Compatibility: DPMI [optional] 1.0+
Expects: AX    0508H
ESI   memory block handle (as obtained via INT 31H 0504H)
EBX   base offset of page(s) to map
ECX   number of pages
EDX   physical address of device memory (page-aligned)
                                                                  
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
                                                                  
Info: This maps the physical addresses assigned to a device into the
linear addresses of a block allocated via INT 31H 0504H.

This is designed to make it possible to page-out physical memory
that is ordinarily assigned to a device, such as a video memory
buffer or a Weitek numeric coprocessor.

See Also: DPMI API
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INT 31H 0508H: Map Device in Memory Block