Int 1A Fn B18E  - Pci Bios V2.1+ - Get Irq Routing Information (32-bit)    [X]

   AX = B18Eh
   BX = 0000h
   DS = segment/selector for PCI BIOS data
       (real mode: F000h; 16-bit PM: physical 000F0000h; 32-bit PM: as
       specified by BIOS32 services directory)
   ES:(E)DI -> IRQ routing table header (see #0955 at AX=B406h)

Return: CF clear if successful
       AH = 00h
       BX = bit map of IRQ channels permanently dedicated to PCI
       WORD ES:[DI] = size of returned data
   CF set on error
       AH = error code (59h) (see #0939)
       WORD ES:[DI] = required size of buffer

See Also: AX=B10Fh,AX=B406h,INT 2F/AX=1684h/BX=304Ch