Function GetPciADR

rEFIt_UEFI/Platform/FixBiosDsdt.cpp:553–592

}

VOID GetPciADR(IN EFI_DEVICE_PATH_PROTOCOL *DevicePath, OUT UINT32 *Addr1, OUT UINT32 *Addr2, OUT UINT32 *Addr3)
{
  PCI_DEVICE_PATH *PciNode;
  UINTN           PciNodeCount;
  EFI_DEVICE_PATH_PROTOCOL *TmpDevicePath = DuplicateDevicePath(DevicePath);

  // default to 0
  if (Addr1 != NULL) *Addr1 = 0;
  if (Addr2 != NULL) *Addr2 = 0xFFFE; //some code we will consider as "non-exists" b/c 0 is meaningful value
                                      // as well as 0xFFFF
  if (Addr3 != NULL) *Addr3 = 0xFFFE;
  if (!TmpDevicePath) {
    return;
  }

  // sanity check - expecting ACPI path for PciRoot
  if (TmpDevicePath->Type != ACPI_DEVICE_PATH && TmpDevicePath->SubType != ACPI_DP) {
    FreePool(TmpDevicePath);
    return;
  }

  PciNodeCount = 0;
  while (TmpDevicePath && !IsDevicePathEndType(TmpDevicePath)) {
    if (TmpDevicePath->Type == HARDWARE_DEVICE_PATH && TmpDevicePath->SubType == HW_PCI_DP) {
      PciNodeCount++;
      PciNode = (PCI_DEVICE_PATH *)TmpDevicePath;
      if (PciNodeCount == 1 && Addr1 != NULL) {
        *Addr1 = (PciNode->Device << 16) | PciNode->Function;
      } else if (PciNodeCount == 2 && Addr2 != NULL) {
        *Addr2 = (PciNode->Device << 16) | PciNode->Function;
      } else if (PciNodeCount == 3 && Addr3 != NULL) {
        *Addr3 = (PciNode->Device << 16) | PciNode->Function;
      } else {
        break;
      }
    }
    TmpDevicePath = NextDevicePathNode(TmpDevicePath);
  }
  return;
}

/* Discussion
 Native USB mean for those chipsets IOUSBFamily set some "errata"