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+/** @file
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+
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+ Copyright (c) 2021, Ampere Computing LLC. All rights reserved.<BR>
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+
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+ SPDX-License-Identifier: BSD-2-Clause-Patent
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+
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+**/
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+
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+#include <Uefi.h>
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+
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+#include <Guid/RootComplexInfoHob.h>
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+#include <Library/DebugLib.h>
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+#include <Library/HobLib.h>
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+#include <Library/Ac01PcieLib.h>
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+#include <Library/TimerLib.h>
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+#include <Library/UefiBootServicesTableLib.h>
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+#include <Protocol/DevicePath.h>
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+#include <Protocol/PciHostBridgeResourceAllocation.h>
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+#include <Protocol/PciPlatform.h>
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+
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+#pragma pack(1)
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+typedef struct {
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+ ACPI_HID_DEVICE_PATH AcpiDevicePath;
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+ EFI_DEVICE_PATH_PROTOCOL EndDevicePath;
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+} EFI_PCI_ROOT_BRIDGE_DEVICE_PATH;
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+#pragma pack ()
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+
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+/**
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+ Callback funciton for EndEnumeration notification from PCI stack.
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+
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+ @param[in] RootBridgeIndex Index to identify of PCIE Root bridge.
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+ @param[in] Phase The phase of enumeration as informed from PCI stack.
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+**/
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+VOID
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+NotifyPhaseCallBack (
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+ IN UINTN RootBridgeIndex,
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+ IN EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PHASE Phase
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+ )
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+{
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+ AC01_ROOT_COMPLEX *RootComplexList;
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+ VOID *Hob;
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+
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+ Hob = GetFirstGuidHob (&gRootComplexInfoHobGuid);
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+ if (Hob == NULL) {
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+ return;
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+ }
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+
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+ RootComplexList = (AC01_ROOT_COMPLEX *)GET_GUID_HOB_DATA (Hob);
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+
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+ switch (Phase) {
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+ case EfiPciHostBridgeEndEnumeration:
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+ Ac01PcieCoreEndEnumeration (&RootComplexList[RootBridgeIndex]);
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+ break;
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+
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+ case EfiPciHostBridgeBeginEnumeration:
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+ // 100ms that help fixing completion timeout issue
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+ MicroSecondDelay (100000);
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+ break;
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+
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+ case EfiPciHostBridgeBeginBusAllocation:
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+ case EfiPciHostBridgeEndBusAllocation:
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+ case EfiPciHostBridgeBeginResourceAllocation:
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+ case EfiPciHostBridgeAllocateResources:
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+ case EfiPciHostBridgeSetResources:
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+ case EfiPciHostBridgeFreeResources:
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+ case EfiPciHostBridgeEndResourceAllocation:
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+ case EfiMaxPciHostBridgeEnumerationPhase:
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+ break;
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+ }
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+}
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+
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+/**
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+
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+ Perform initialization by the phase indicated.
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+
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+ @param This Pointer to the EFI_PCI_PLATFORM_PROTOCOL instance.
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+ @param HostBridge The associated PCI host bridge handle.
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+ @param Phase The phase of the PCI controller enumeration.
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+ @param ChipsetPhase Defines the execution phase of the PCI chipset driver.
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+
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+ @retval EFI_SUCCESS Must return with success.
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+
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+**/
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+EFI_STATUS
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+EFIAPI
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+PhaseNotify (
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+ IN EFI_PCI_PLATFORM_PROTOCOL *This,
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+ IN EFI_HANDLE HostBridge,
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+ IN EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PHASE Phase,
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+ IN EFI_PCI_CHIPSET_EXECUTION_PHASE ChipsetPhase
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+ )
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+{
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+ EFI_PCI_ROOT_BRIDGE_DEVICE_PATH *RootBridgeDevPath;
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+ EFI_HANDLE RootBridgeHandle = NULL;
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+ EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL *ResAlloc = NULL;
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+ EFI_STATUS Status;
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+
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+ if (ChipsetPhase != ChipsetExit) {
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+ return EFI_SUCCESS;
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+ }
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+
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+ //
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+ // Get HostBridgeInstance from HostBridge handle.
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+ //
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+ Status = gBS->HandleProtocol (
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+ HostBridge,
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+ &gEfiPciHostBridgeResourceAllocationProtocolGuid,
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+ (VOID **)&ResAlloc
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+ );
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+
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+ while (TRUE) {
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+ Status = ResAlloc->GetNextRootBridge (ResAlloc, &RootBridgeHandle);
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+ if (EFI_ERROR (Status)) {
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+ break;
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+ }
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+
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+ Status = gBS->HandleProtocol (
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+ RootBridgeHandle,
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+ &gEfiDevicePathProtocolGuid,
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+ (VOID **)&RootBridgeDevPath
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+ );
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+ if (EFI_ERROR (Status)) {
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+ DEBUG ((DEBUG_ERROR, "%a %d: Failed to locate RootBridge DevicePath\n", __FUNCTION__, __LINE__));
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+ break;
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+ }
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+
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+ NotifyPhaseCallBack (RootBridgeDevPath->AcpiDevicePath.UID, Phase);
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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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+/**
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+
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+ The PlatformPrepController() function can be used to notify the platform driver so that
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+ it can perform platform-specific actions. No specific actions are required.
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+ Several notification points are defined at this time. More synchronization points may be
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+ added as required in the future. The PCI bus driver calls the platform driver twice for
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+ every PCI controller-once before the PCI Host Bridge Resource Allocation Protocol driver
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+ is notified, and once after the PCI Host Bridge Resource Allocation Protocol driver has
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+ been notified.
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+ This member function may not perform any error checking on the input parameters. It also
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+ does not return any error codes. If this member function detects any error condition, it
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+ needs to handle those errors on its own because there is no way to surface any errors to
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+ the caller.
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+
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+ @param This Pointer to the EFI_PCI_PLATFORM_PROTOCOL instance.
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+ @param HostBridge The associated PCI host bridge handle.
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+ @param RootBridge The associated PCI root bridge handle.
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+ @param PciAddress The address of the PCI device on the PCI bus.
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+ @param Phase The phase of the PCI controller enumeration.
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+ @param ChipsetPhase Defines the execution phase of the PCI chipset driver.
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+
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+ @retval EFI_SUCCESS The function completed successfully.
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+ @retval EFI_UNSUPPORTED Not supported.
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+
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+**/
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+EFI_STATUS
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+EFIAPI
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+PlatformPrepController (
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+ IN EFI_PCI_PLATFORM_PROTOCOL *This,
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+ IN EFI_HANDLE HostBridge,
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+ IN EFI_HANDLE RootBridge,
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+ IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_ADDRESS PciAddress,
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+ IN EFI_PCI_CONTROLLER_RESOURCE_ALLOCATION_PHASE Phase,
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+ IN EFI_PCI_CHIPSET_EXECUTION_PHASE ChipsetPhase
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+ )
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+{
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+ return EFI_UNSUPPORTED;
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+}
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+
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+/**
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+ Set the PciPolicy as EFI_RESERVE_ISA_IO_NO_ALIAS | EFI_RESERVE_VGA_IO_NO_ALIAS.
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+
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+ @param This The pointer to the Protocol itself.
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+ @param PciPolicy The returned Policy.
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+
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+ @retval EFI_UNSUPPORTED Function not supported.
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+ @retval EFI_INVALID_PARAMETER Invalid PciPolicy value.
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+
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+**/
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+EFI_STATUS
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+EFIAPI
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+GetPlatformPolicy (
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+ IN CONST EFI_PCI_PLATFORM_PROTOCOL *This,
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+ OUT EFI_PCI_PLATFORM_POLICY *PciPolicy
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+ )
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+{
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+ return EFI_UNSUPPORTED;
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+}
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+
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+/**
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+
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+ Return a PCI ROM image for the onboard device represented by PciHandle.
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+
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+ @param This Protocol instance pointer.
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+ @param PciHandle PCI device to return the ROM image for.
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+ @param RomImage PCI Rom Image for onboard device.
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+ @param RomSize Size of RomImage in bytes.
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+
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+ @retval EFI_SUCCESS RomImage is valid.
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+ @retval EFI_NOT_FOUND No RomImage.
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+
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+**/
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+EFI_STATUS
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+EFIAPI
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+GetPciRom (
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+ IN CONST EFI_PCI_PLATFORM_PROTOCOL *This,
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+ IN EFI_HANDLE PciHandle,
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+ OUT VOID **RomImage,
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+ OUT UINTN *RomSize
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+ )
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+{
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+ return EFI_NOT_FOUND;
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+}
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+
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+//
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+// Interface defintion of PCI Platform protocol.
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+//
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+EFI_PCI_PLATFORM_PROTOCOL mPciPlatformProtocol = {
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+ .PlatformNotify = PhaseNotify,
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+ .PlatformPrepController = PlatformPrepController,
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+ .GetPlatformPolicy = GetPlatformPolicy,
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+ .GetPciRom = GetPciRom
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+};
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+
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+/**
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+
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+ The Entry point of the Pci Platform Driver.
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+
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+ @param ImageHandle Handle to the image.
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+ @param SystemTable Handle to System Table.
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+
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+ @retval EFI_STATUS Status of the function calling.
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+
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+**/
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+EFI_STATUS
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+PciPlatformDriverEntry (
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+ IN EFI_HANDLE ImageHandle,
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+ IN EFI_SYSTEM_TABLE *SystemTable
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+ )
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+{
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+ EFI_STATUS Status;
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+ EFI_HANDLE PciPlatformHandle;
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+
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+ //
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+ // Install on a new handle
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+ //
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+ PciPlatformHandle = NULL;
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+ Status = gBS->InstallMultipleProtocolInterfaces (
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+ &PciPlatformHandle,
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+ &gEfiPciPlatformProtocolGuid,
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+ &mPciPlatformProtocol,
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+ NULL
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+ );
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+
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+ return Status;
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+}
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