Int 15 Fn 5303  - Advanced Power Management Spec - Connect 32-bit Protmod  [p]

   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

See Also: AX=5301h,AX=5302h,AX=5304h