INT 15 - Advanced Power Management Spec - CONNECT 32-BIT PROTMODE INTERFACE
        AX = 5303h
        BX = 0000h (device ID of system BIOS)
Return: CF clear if successful
            AX = real-mode segment base address of protected-mode 32-bit code
                segment
            EBX = offset of entry point
            CX = real-mode segment base address of protected-mode 16-bit code
                segment
            DX = real-mode segment base address of protected-mode 16-bit data
                segment
        CF set on error
            AH = error code (07h,08h,09h) (see AX=5300h)
Notes:  the caller must initialize three consecutive descriptors with the
          returned segment base addresses for 32-bit code, 16-bit code, and
          16-bit data, respectively; these descriptors must be valid whenever
          the protected-mode interface is called, and will have their limits
          arbitrarily set to 64K.
        the protected mode interface is invoked by making a far call to the
          32-bit code segment with the same register values as for INT 15; it
          must be invoked while CPL=0, the code segment descriptor must have a
          DPL of 0, the stack must be in a 32-bit segment and have enough room
          for BIOS use and possible interrupts, and the current I/O permission
          bit map must allow access to the I/O ports used for power management.
        functions 00h-03h are not available from protected mode
SeeAlso: AX=5302h,AX=5304h