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