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INT 31 - DPMI 0.9 API - protected mode - GET STATE SAVE/RESTORE ADDRESSES
        AX = 0305h
Return: CF set on error
        CF clear if successfule
            AX = size in bytes of state buffer
            BX:CX = real mode address of procedure to save/restore state
            SI:DI / SI:EDI = protected mode procedure to save/restore state
Notes:  the buffer size will be zero if it is not necessary to preserve state
        16-bit programs should call SI:DI, 32-bit programs should call SI:EDI
        this function is only needed if using the raw mode switch service
SeeAlso: AX=0306h

Values to call state-save procedures with:
        AL = direction
            00h save state
            01h restore state
        ES:DI / ES:EDI -> state buffer
Return: all registers preserved