X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 31 - dpmi 0.9 api - protected mode

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INT 31 - DPMI 0.9 API - protected mode - PHYSICAL ADDRESS MAPPING
        AX = 0800h
        BX:CX = physical address
        SI:DI = size in bytes
Return: CF set on error
        CF clear if successful
            BX:CX = linear address which maps the requested physical memory
Notes:  implementations may refuse this call because it can circumvent protects
        the caller must build an appropriate selector for the memory
        do not use for memory mapped in the first megabyte

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