Int 15 Fn 5302  R - Advanced Power Management Spec - Connect 16-bit Protm  [p]

   AX = 5302h
   BX = 0000h (device ID of system BIOS)

Return: CF clear if successful
       AX = real-mode segment base address of protected-mode 16-bit code
       segment
       BX = offset of entry point
       CX = real-mode segment base address of protected-mode 16-bit data
       segment
   CF set on error
       AH = error code (05h,06h,09h) (see AX=5300h)

Notes: the caller must initialize two consecutive descriptors with the
     returned segment base addresses; 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 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 16-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

See Also: AX=5301h,AX=5303h,AX=5304h