diff options
Diffstat (limited to 'PcAtChipsetPkg/IsaAcpiDxe')
| -rw-r--r-- | PcAtChipsetPkg/IsaAcpiDxe/PcatIsaAcpi.c | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/PcAtChipsetPkg/IsaAcpiDxe/PcatIsaAcpi.c b/PcAtChipsetPkg/IsaAcpiDxe/PcatIsaAcpi.c index e8789e5d11..468f193955 100644 --- a/PcAtChipsetPkg/IsaAcpiDxe/PcatIsaAcpi.c +++ b/PcAtChipsetPkg/IsaAcpiDxe/PcatIsaAcpi.c @@ -73,6 +73,10 @@ PcatIsaAcpiDriverBindingSupported ( EFI_STATUS Status;
EFI_PCI_IO_PROTOCOL *PciIo;
PCI_TYPE00 Pci;
+ UINTN SegmentNumber;
+ UINTN BusNumber;
+ UINTN DeviceNumber;
+ UINTN FunctionNumber;
//
// Get PciIo protocol instance
@@ -110,10 +114,25 @@ PcatIsaAcpiDriverBindingSupported ( //
// See if this is an Intel PCI to ISA bridge in Positive Decode Mode
//
- if (Pci.Hdr.ClassCode[1] == PCI_CLASS_BRIDGE_ISA_PDECODE &&
- Pci.Hdr.VendorId == 0x8086 &&
- (Pci.Hdr.DeviceId & 0xF000) == 0x7000) {
- Status = EFI_SUCCESS;
+ if (Pci.Hdr.ClassCode[1] == PCI_CLASS_BRIDGE_ISA_PDECODE &&
+ Pci.Hdr.VendorId == 0x8086 ) {
+ //
+ // See if this is on Function #0 to avoid false positives on
+ // PCI_CLASS_BRIDGE_OTHER that has the same value as
+ // PCI_CLASS_BRIDGE_ISA_PDECODE
+ //
+ Status = PciIo->GetLocation (
+ PciIo,
+ &SegmentNumber,
+ &BusNumber,
+ &DeviceNumber,
+ &FunctionNumber
+ );
+ if (!EFI_ERROR (Status) && FunctionNumber == 0) {
+ Status = EFI_SUCCESS;
+ } else {
+ Status = EFI_UNSUPPORTED;
+ }
}
}
}
|