Compatibility: DPMI 0.9+
Expects: AX    0800H
BX:CX physical address of memory
SI:DI size of region to map, in bytes
                                                                  
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
BX:CX linear address usable to access physical memory
                                                                  
Info: This converts a physical address into a linear address.

This allows device drivers to access device-defined memory
addresses above 1 MB such as the Weitek math chip (usually mapped
at 3 GB) or hardware such as video coprocessors' memory aperture.

See Also: DPMI API
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INT 31H 0800H: Physical Address Mapping