mirror of https://github.com/acidanthera/audk.git
974 lines
21 KiB
C
974 lines
21 KiB
C
/*++
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Copyright (c) 2005 - 2006, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name:
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PciDeviceSupport.c
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Abstract:
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This file provides routine to support Pci device node manipulation
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Revision History
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--*/
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#include "PciBus.h"
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//
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// This device structure is serviced as a header.
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// Its Next field points to the first root bridge device node
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//
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LIST_ENTRY gPciDevicePool;
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EFI_STATUS
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InitializePciDevicePool (
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VOID
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)
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/*++
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Routine Description:
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Initialize the gPciDevicePool
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Arguments:
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Returns:
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None
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--*/
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{
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InitializeListHead (&gPciDevicePool);
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return EFI_SUCCESS;
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}
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EFI_STATUS
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InsertRootBridge (
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IN PCI_IO_DEVICE *RootBridge
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)
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/*++
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Routine Description:
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Insert a root bridge into PCI device pool
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Arguments:
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RootBridge - A pointer to the PCI_IO_DEVICE.
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Returns:
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None
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--*/
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{
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InsertTailList (&gPciDevicePool, &(RootBridge->Link));
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return EFI_SUCCESS;
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}
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EFI_STATUS
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InsertPciDevice (
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PCI_IO_DEVICE *Bridge,
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PCI_IO_DEVICE *PciDeviceNode
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)
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/*++
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Routine Description:
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This function is used to insert a PCI device node under
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a bridge
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Arguments:
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Bridge - A pointer to the PCI_IO_DEVICE.
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PciDeviceNode - A pointer to the PCI_IO_DEVICE.
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Returns:
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None
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--*/
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{
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InsertTailList (&Bridge->ChildList, &(PciDeviceNode->Link));
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PciDeviceNode->Parent = Bridge;
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return EFI_SUCCESS;
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}
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EFI_STATUS
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DestroyRootBridge (
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IN PCI_IO_DEVICE *RootBridge
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)
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/*++
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Routine Description:
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Arguments:
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RootBridge - A pointer to the PCI_IO_DEVICE.
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Returns:
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None
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--*/
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{
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DestroyPciDeviceTree (RootBridge);
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gBS->FreePool (RootBridge);
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return EFI_SUCCESS;
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}
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EFI_STATUS
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DestroyPciDeviceTree (
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IN PCI_IO_DEVICE *Bridge
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)
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/*++
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Routine Description:
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Destroy all the pci device node under the bridge.
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Bridge itself is not included.
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Arguments:
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Bridge - A pointer to the PCI_IO_DEVICE.
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Returns:
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None
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--*/
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{
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LIST_ENTRY *CurrentLink;
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PCI_IO_DEVICE *Temp;
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while (!IsListEmpty (&Bridge->ChildList)) {
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CurrentLink = Bridge->ChildList.ForwardLink;
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//
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// Remove this node from the linked list
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//
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RemoveEntryList (CurrentLink);
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Temp = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
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if (IS_PCI_BRIDGE (&(Temp->Pci))) {
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DestroyPciDeviceTree (Temp);
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}
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gBS->FreePool (Temp);
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}
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return EFI_SUCCESS;
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}
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EFI_STATUS
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DestroyRootBridgeByHandle (
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EFI_HANDLE Controller
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)
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/*++
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Routine Description:
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Destroy all device nodes under the root bridge
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specified by Controller.
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The root bridge itself is also included.
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Arguments:
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Controller - An efi handle.
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Returns:
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None
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--*/
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{
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LIST_ENTRY *CurrentLink;
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PCI_IO_DEVICE *Temp;
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CurrentLink = gPciDevicePool.ForwardLink;
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while (CurrentLink && CurrentLink != &gPciDevicePool) {
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Temp = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
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if (Temp->Handle == Controller) {
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RemoveEntryList (CurrentLink);
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DestroyPciDeviceTree (Temp);
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gBS->FreePool(Temp);
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return EFI_SUCCESS;
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}
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CurrentLink = CurrentLink->ForwardLink;
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}
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return EFI_NOT_FOUND;
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}
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EFI_STATUS
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RegisterPciDevice (
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IN EFI_HANDLE Controller,
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IN PCI_IO_DEVICE *PciIoDevice,
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OUT EFI_HANDLE *Handle OPTIONAL
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)
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/*++
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Routine Description:
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This function registers the PCI IO device. It creates a handle for this PCI IO device
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(if the handle does not exist), attaches appropriate protocols onto the handle, does
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necessary initialization, and sets up parent/child relationship with its bus controller.
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Arguments:
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Controller - An EFI handle for the PCI bus controller.
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PciIoDevice - A PCI_IO_DEVICE pointer to the PCI IO device to be registered.
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Handle - A pointer to hold the EFI handle for the PCI IO device.
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Returns:
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EFI_SUCCESS - The PCI device is successfully registered.
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Others - An error occurred when registering the PCI device.
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--*/
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{
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EFI_STATUS Status;
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UINT8 PciExpressCapRegOffset;
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//
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// Install the pciio protocol, device path protocol and
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// Bus Specific Driver Override Protocol
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//
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if (PciIoDevice->BusOverride) {
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Status = gBS->InstallMultipleProtocolInterfaces (
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&PciIoDevice->Handle,
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&gEfiDevicePathProtocolGuid,
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PciIoDevice->DevicePath,
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&gEfiPciIoProtocolGuid,
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&PciIoDevice->PciIo,
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&gEfiBusSpecificDriverOverrideProtocolGuid,
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&PciIoDevice->PciDriverOverride,
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NULL
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);
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} else {
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Status = gBS->InstallMultipleProtocolInterfaces (
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&PciIoDevice->Handle,
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&gEfiDevicePathProtocolGuid,
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PciIoDevice->DevicePath,
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&gEfiPciIoProtocolGuid,
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&PciIoDevice->PciIo,
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NULL
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);
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}
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if (EFI_ERROR (Status)) {
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return Status;
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} else {
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Status = gBS->OpenProtocol (
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Controller,
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&gEfiPciRootBridgeIoProtocolGuid,
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(VOID **)&(PciIoDevice->PciRootBridgeIo),
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gPciBusDriverBinding.DriverBindingHandle,
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PciIoDevice->Handle,
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EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
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);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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}
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if (Handle != NULL) {
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*Handle = PciIoDevice->Handle;
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}
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//
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// Detect if PCI Express Device
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//
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PciExpressCapRegOffset = 0;
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Status = LocateCapabilityRegBlock (
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PciIoDevice,
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EFI_PCI_CAPABILITY_ID_PCIEXP,
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&PciExpressCapRegOffset,
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NULL
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);
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if (!EFI_ERROR (Status)) {
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PciIoDevice->IsPciExp = TRUE;
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DEBUG ((EFI_D_ERROR, "PciExp - %x (B-%x, D-%x, F-%x)\n", PciIoDevice->IsPciExp, PciIoDevice->BusNumber, PciIoDevice->DeviceNumber, PciIoDevice->FunctionNumber));
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}
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//
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// Indicate the pci device is registered
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//
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PciIoDevice->Registered = TRUE;
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return EFI_SUCCESS;
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}
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EFI_STATUS
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DeRegisterPciDevice (
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IN EFI_HANDLE Controller,
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IN EFI_HANDLE Handle
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)
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/*++
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Routine Description:
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This function is used to de-register the PCI device from the EFI,
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That includes un-installing PciIo protocol from the specified PCI
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device handle.
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Arguments:
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Controller - An efi handle.
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Handle - An efi handle.
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Returns:
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None
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--*/
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{
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EFI_PCI_IO_PROTOCOL *PciIo;
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EFI_STATUS Status;
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PCI_IO_DEVICE *PciIoDevice;
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PCI_IO_DEVICE *Node;
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LIST_ENTRY *CurrentLink;
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EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;
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Status = gBS->OpenProtocol (
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Handle,
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&gEfiPciIoProtocolGuid,
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(VOID **) &PciIo,
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gPciBusDriverBinding.DriverBindingHandle,
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Controller,
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EFI_OPEN_PROTOCOL_GET_PROTOCOL
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);
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if (!EFI_ERROR (Status)) {
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PciIoDevice = PCI_IO_DEVICE_FROM_PCI_IO_THIS (PciIo);
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//
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// If it is already de-registered
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//
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if (!PciIoDevice->Registered) {
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return EFI_SUCCESS;
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}
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//
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// If it is PPB, first de-register its children
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//
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if (IS_PCI_BRIDGE (&(PciIoDevice->Pci))) {
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CurrentLink = PciIoDevice->ChildList.ForwardLink;
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while (CurrentLink && CurrentLink != &PciIoDevice->ChildList) {
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Node = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
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Status = DeRegisterPciDevice (Controller, Node->Handle);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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CurrentLink = CurrentLink->ForwardLink;
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}
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}
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//
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// First disconnect this device
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//
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// PciIoDevice->PciIo.Attributes(&(PciIoDevice->PciIo),
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// EfiPciIoAttributeOperationDisable,
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// EFI_PCI_DEVICE_ENABLE,
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// NULL
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// );
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//
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// Close the child handle
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//
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Status = gBS->CloseProtocol (
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Controller,
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&gEfiPciRootBridgeIoProtocolGuid,
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gPciBusDriverBinding.DriverBindingHandle,
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Handle
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);
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//
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// Un-install the device path protocol and pci io protocol
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//
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if (PciIoDevice->BusOverride) {
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Status = gBS->UninstallMultipleProtocolInterfaces (
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Handle,
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&gEfiDevicePathProtocolGuid,
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PciIoDevice->DevicePath,
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&gEfiPciIoProtocolGuid,
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&PciIoDevice->PciIo,
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&gEfiBusSpecificDriverOverrideProtocolGuid,
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&PciIoDevice->PciDriverOverride,
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NULL
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);
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} else {
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Status = gBS->UninstallMultipleProtocolInterfaces (
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Handle,
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&gEfiDevicePathProtocolGuid,
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PciIoDevice->DevicePath,
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&gEfiPciIoProtocolGuid,
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&PciIoDevice->PciIo,
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NULL
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);
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}
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if (EFI_ERROR (Status)) {
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gBS->OpenProtocol (
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Controller,
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&gEfiPciRootBridgeIoProtocolGuid,
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(VOID **) &PciRootBridgeIo,
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gPciBusDriverBinding.DriverBindingHandle,
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Handle,
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EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
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);
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return Status;
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}
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//
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// The Device Driver should disable this device after disconnect
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// so the Pci Bus driver will not touch this device any more.
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// Restore the register field to the original value
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//
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PciIoDevice->Registered = FALSE;
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PciIoDevice->Handle = NULL;
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} else {
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//
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// Handle may be closed before
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//
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return EFI_SUCCESS;
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}
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return EFI_SUCCESS;
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}
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EFI_STATUS
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EnableBridgeAttributes (
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IN PCI_IO_DEVICE *PciIoDevice
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)
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{
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PCI_TYPE01 PciData;
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//
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// NOTE: We should not set EFI_PCI_DEVICE_ENABLE for a bridge
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// directly, because some legacy BIOS will NOT assign
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// IO or Memory resource for a bridge who has no child
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// device. So we add check IO or Memory here.
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//
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PciIoDevice->PciIo.Pci.Read (
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&PciIoDevice->PciIo,
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EfiPciIoWidthUint8,
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0,
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sizeof (PciData),
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&PciData
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);
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if ((((PciData.Bridge.IoBase & 0xF) == 0) &&
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(PciData.Bridge.IoBase != 0 || PciData.Bridge.IoLimit != 0)) ||
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(((PciData.Bridge.IoBase & 0xF) == 1) &&
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((PciData.Bridge.IoBase & 0xF0) != 0 || (PciData.Bridge.IoLimit & 0xF0) != 0 || PciData.Bridge.IoBaseUpper16 != 0 || PciData.Bridge.IoLimitUpper16 != 0))) {
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PciIoDevice->PciIo.Attributes(
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&(PciIoDevice->PciIo),
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EfiPciIoAttributeOperationEnable,
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(EFI_PCI_IO_ATTRIBUTE_IO | EFI_PCI_IO_ATTRIBUTE_BUS_MASTER),
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NULL
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);
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}
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if ((PciData.Bridge.MemoryBase & 0xFFF0) != 0 || (PciData.Bridge.MemoryLimit & 0xFFF0) != 0) {
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PciIoDevice->PciIo.Attributes(
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&(PciIoDevice->PciIo),
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EfiPciIoAttributeOperationEnable,
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(EFI_PCI_IO_ATTRIBUTE_MEMORY | EFI_PCI_IO_ATTRIBUTE_BUS_MASTER),
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NULL
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);
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}
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if ((((PciData.Bridge.PrefetchableMemoryBase & 0xF) == 0) &&
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(PciData.Bridge.PrefetchableMemoryBase != 0 || PciData.Bridge.PrefetchableMemoryLimit != 0)) ||
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(((PciData.Bridge.PrefetchableMemoryBase & 0xF) == 1) &&
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((PciData.Bridge.PrefetchableMemoryBase & 0xFFF0) != 0 || (PciData.Bridge.PrefetchableMemoryLimit & 0xFFF0) != 0 || PciData.Bridge.PrefetchableBaseUpper32 != 0 || PciData.Bridge.PrefetchableLimitUpper32 != 0))) {
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PciIoDevice->PciIo.Attributes(
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&(PciIoDevice->PciIo),
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EfiPciIoAttributeOperationEnable,
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(EFI_PCI_IO_ATTRIBUTE_MEMORY | EFI_PCI_IO_ATTRIBUTE_BUS_MASTER),
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NULL
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);
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}
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return EFI_SUCCESS;
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}
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|
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EFI_STATUS
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StartPciDevicesOnBridge (
|
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IN EFI_HANDLE Controller,
|
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IN PCI_IO_DEVICE *RootBridge,
|
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IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
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)
|
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/*++
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Routine Description:
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Start to manage the PCI device on specified the root bridge or PCI-PCI Bridge
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|
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Arguments:
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Controller - An efi handle.
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RootBridge - A pointer to the PCI_IO_DEVICE.
|
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RemainingDevicePath - A pointer to the EFI_DEVICE_PATH_PROTOCOL.
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NumberOfChildren - Children number.
|
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ChildHandleBuffer - A pointer to the child handle buffer.
|
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|
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Returns:
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None
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--*/
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{
|
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PCI_IO_DEVICE *Temp;
|
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PCI_IO_DEVICE *PciIoDevice;
|
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EFI_DEV_PATH_PTR Node;
|
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EFI_DEVICE_PATH_PROTOCOL *CurrentDevicePath;
|
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EFI_STATUS Status;
|
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LIST_ENTRY *CurrentLink;
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|
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CurrentLink = RootBridge->ChildList.ForwardLink;
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while (CurrentLink && CurrentLink != &RootBridge->ChildList) {
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Temp = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
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if (RemainingDevicePath != NULL) {
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Node.DevPath = RemainingDevicePath;
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|
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if (Node.Pci->Device != Temp->DeviceNumber ||
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Node.Pci->Function != Temp->FunctionNumber) {
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CurrentLink = CurrentLink->ForwardLink;
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continue;
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}
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|
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//
|
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// Check if the device has been assigned with required resource
|
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//
|
|
if (!Temp->Allocated) {
|
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return EFI_NOT_READY;
|
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}
|
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|
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//
|
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// Check if the current node has been registered before
|
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// If it is not, register it
|
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//
|
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if (!Temp->Registered) {
|
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PciIoDevice = Temp;
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|
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Status = RegisterPciDevice (
|
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Controller,
|
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PciIoDevice,
|
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NULL
|
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);
|
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|
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}
|
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|
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//
|
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// Get the next device path
|
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//
|
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CurrentDevicePath = NextDevicePathNode (RemainingDevicePath);
|
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if (IsDevicePathEnd (CurrentDevicePath)) {
|
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return EFI_SUCCESS;
|
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}
|
|
|
|
//
|
|
// If it is a PPB
|
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//
|
|
if (IS_PCI_BRIDGE (&(Temp->Pci))) {
|
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Status = StartPciDevicesOnBridge (
|
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Controller,
|
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Temp,
|
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CurrentDevicePath
|
|
);
|
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EnableBridgeAttributes (Temp);
|
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|
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return Status;
|
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} else {
|
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|
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//
|
|
// Currently, the PCI bus driver only support PCI-PCI bridge
|
|
//
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
} else {
|
|
|
|
//
|
|
// If remaining device path is NULL,
|
|
// try to enable all the pci devices under this bridge
|
|
//
|
|
|
|
if (!Temp->Registered && Temp->Allocated) {
|
|
|
|
PciIoDevice = Temp;
|
|
|
|
Status = RegisterPciDevice (
|
|
Controller,
|
|
PciIoDevice,
|
|
NULL
|
|
);
|
|
|
|
}
|
|
|
|
if (IS_PCI_BRIDGE (&(Temp->Pci))) {
|
|
Status = StartPciDevicesOnBridge (
|
|
Controller,
|
|
Temp,
|
|
RemainingDevicePath
|
|
);
|
|
EnableBridgeAttributes (Temp);
|
|
}
|
|
|
|
CurrentLink = CurrentLink->ForwardLink;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
return EFI_NOT_FOUND;
|
|
}
|
|
|
|
EFI_STATUS
|
|
StartPciDevices (
|
|
IN EFI_HANDLE Controller,
|
|
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Start to manage the PCI device according to RemainingDevicePath
|
|
If RemainingDevicePath == NULL, the PCI bus driver will start
|
|
to manage all the PCI devices it found previously
|
|
|
|
Arguments:
|
|
Controller - An efi handle.
|
|
RemainingDevicePath - A pointer to the EFI_DEVICE_PATH_PROTOCOL.
|
|
|
|
Returns:
|
|
|
|
None
|
|
|
|
--*/
|
|
{
|
|
EFI_DEV_PATH_PTR Node;
|
|
PCI_IO_DEVICE *RootBridge;
|
|
LIST_ENTRY *CurrentLink;
|
|
|
|
if (RemainingDevicePath != NULL) {
|
|
|
|
//
|
|
// Check if the RemainingDevicePath is valid
|
|
//
|
|
Node.DevPath = RemainingDevicePath;
|
|
if (Node.DevPath->Type != HARDWARE_DEVICE_PATH ||
|
|
Node.DevPath->SubType != HW_PCI_DP ||
|
|
DevicePathNodeLength (Node.DevPath) != sizeof (PCI_DEVICE_PATH)
|
|
) {
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
}
|
|
|
|
CurrentLink = gPciDevicePool.ForwardLink;
|
|
|
|
while (CurrentLink && CurrentLink != &gPciDevicePool) {
|
|
|
|
RootBridge = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
|
|
//
|
|
// Locate the right root bridge to start
|
|
//
|
|
if (RootBridge->Handle == Controller) {
|
|
StartPciDevicesOnBridge (
|
|
Controller,
|
|
RootBridge,
|
|
RemainingDevicePath
|
|
);
|
|
}
|
|
|
|
CurrentLink = CurrentLink->ForwardLink;
|
|
}
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
PCI_IO_DEVICE *
|
|
CreateRootBridge (
|
|
IN EFI_HANDLE RootBridgeHandle
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
|
|
Arguments:
|
|
RootBridgeHandle - An efi handle.
|
|
|
|
Returns:
|
|
|
|
None
|
|
|
|
--*/
|
|
{
|
|
|
|
EFI_STATUS Status;
|
|
PCI_IO_DEVICE *Dev;
|
|
|
|
Dev = NULL;
|
|
Status = gBS->AllocatePool (
|
|
EfiBootServicesData,
|
|
sizeof (PCI_IO_DEVICE),
|
|
(VOID **) &Dev
|
|
);
|
|
|
|
if (EFI_ERROR (Status)) {
|
|
return NULL;
|
|
}
|
|
|
|
ZeroMem (Dev, sizeof (PCI_IO_DEVICE));
|
|
Dev->Signature = PCI_IO_DEVICE_SIGNATURE;
|
|
Dev->Handle = RootBridgeHandle;
|
|
InitializeListHead (&Dev->ChildList);
|
|
|
|
return Dev;
|
|
}
|
|
|
|
PCI_IO_DEVICE *
|
|
GetRootBridgeByHandle (
|
|
EFI_HANDLE RootBridgeHandle
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
|
|
Arguments:
|
|
|
|
RootBridgeHandle - An efi handle.
|
|
|
|
Returns:
|
|
|
|
None
|
|
|
|
--*/
|
|
{
|
|
PCI_IO_DEVICE *RootBridgeDev;
|
|
LIST_ENTRY *CurrentLink;
|
|
|
|
CurrentLink = gPciDevicePool.ForwardLink;
|
|
|
|
while (CurrentLink && CurrentLink != &gPciDevicePool) {
|
|
|
|
RootBridgeDev = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
|
|
if (RootBridgeDev->Handle == RootBridgeHandle) {
|
|
return RootBridgeDev;
|
|
}
|
|
|
|
CurrentLink = CurrentLink->ForwardLink;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
BOOLEAN
|
|
RootBridgeExisted (
|
|
IN EFI_HANDLE RootBridgeHandle
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This function searches if RootBridgeHandle has already existed
|
|
in current device pool.
|
|
|
|
If so, it means the given root bridge has been already enumerated.
|
|
|
|
Arguments:
|
|
|
|
RootBridgeHandle - An efi handle.
|
|
|
|
Returns:
|
|
|
|
None
|
|
|
|
--*/
|
|
{
|
|
PCI_IO_DEVICE *Bridge;
|
|
|
|
Bridge = GetRootBridgeByHandle (RootBridgeHandle);
|
|
|
|
if (Bridge != NULL) {
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
BOOLEAN
|
|
PciDeviceExisted (
|
|
IN PCI_IO_DEVICE *Bridge,
|
|
IN PCI_IO_DEVICE *PciIoDevice
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Arguments:
|
|
|
|
Bridge - A pointer to the PCI_IO_DEVICE.
|
|
PciIoDevice - A pointer to the PCI_IO_DEVICE.
|
|
|
|
Returns:
|
|
|
|
None
|
|
|
|
--*/
|
|
{
|
|
|
|
PCI_IO_DEVICE *Temp;
|
|
LIST_ENTRY *CurrentLink;
|
|
|
|
CurrentLink = Bridge->ChildList.ForwardLink;
|
|
|
|
while (CurrentLink && CurrentLink != &Bridge->ChildList) {
|
|
|
|
Temp = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
|
|
|
|
if (Temp == PciIoDevice) {
|
|
return TRUE;
|
|
}
|
|
|
|
if (!IsListEmpty (&Temp->ChildList)) {
|
|
if (PciDeviceExisted (Temp, PciIoDevice)) {
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
CurrentLink = CurrentLink->ForwardLink;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
PCI_IO_DEVICE *
|
|
ActiveVGADeviceOnTheSameSegment (
|
|
IN PCI_IO_DEVICE *VgaDevice
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Arguments:
|
|
|
|
VgaDevice - A pointer to the PCI_IO_DEVICE.
|
|
|
|
Returns:
|
|
|
|
None
|
|
|
|
--*/
|
|
{
|
|
LIST_ENTRY *CurrentLink;
|
|
PCI_IO_DEVICE *Temp;
|
|
|
|
CurrentLink = gPciDevicePool.ForwardLink;
|
|
|
|
while (CurrentLink && CurrentLink != &gPciDevicePool) {
|
|
|
|
Temp = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
|
|
|
|
if (Temp->PciRootBridgeIo->SegmentNumber == VgaDevice->PciRootBridgeIo->SegmentNumber) {
|
|
|
|
Temp = ActiveVGADeviceOnTheRootBridge (Temp);
|
|
|
|
if (Temp != NULL) {
|
|
return Temp;
|
|
}
|
|
}
|
|
|
|
CurrentLink = CurrentLink->ForwardLink;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
PCI_IO_DEVICE *
|
|
ActiveVGADeviceOnTheRootBridge (
|
|
IN PCI_IO_DEVICE *RootBridge
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Arguments:
|
|
|
|
RootBridge - A pointer to the PCI_IO_DEVICE.
|
|
|
|
Returns:
|
|
|
|
None
|
|
|
|
--*/
|
|
{
|
|
LIST_ENTRY *CurrentLink;
|
|
PCI_IO_DEVICE *Temp;
|
|
|
|
CurrentLink = RootBridge->ChildList.ForwardLink;
|
|
|
|
while (CurrentLink && CurrentLink != &RootBridge->ChildList) {
|
|
|
|
Temp = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
|
|
|
|
if (IS_PCI_VGA(&Temp->Pci) &&
|
|
(Temp->Attributes &
|
|
(EFI_PCI_IO_ATTRIBUTE_VGA_MEMORY |
|
|
EFI_PCI_IO_ATTRIBUTE_VGA_IO |
|
|
EFI_PCI_IO_ATTRIBUTE_VGA_IO_16))) {
|
|
return Temp;
|
|
}
|
|
|
|
if (IS_PCI_BRIDGE (&Temp->Pci)) {
|
|
|
|
Temp = ActiveVGADeviceOnTheRootBridge (Temp);
|
|
|
|
if (Temp != NULL) {
|
|
return Temp;
|
|
}
|
|
}
|
|
|
|
CurrentLink = CurrentLink->ForwardLink;
|
|
}
|
|
|
|
return NULL;
|
|
}
|