+ EFI_STATUS Status;\r
+ XENBUS_DEVICE *Dev;\r
+ EFI_PCI_IO_PROTOCOL *PciIo;\r
+ EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *BarDesc;\r
+ UINT64 MmioAddr;\r
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r
+\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiPciIoProtocolGuid,\r
+ (VOID **) &PciIo,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_BY_DRIVER\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiDevicePathProtocolGuid,\r
+ (VOID **) &DevicePath,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_BY_DRIVER\r
+ );\r
+\r
+ if (EFI_ERROR (Status)) {\r
+ goto ErrorOpenningProtocol;\r
+ }\r
+\r
+ Dev = AllocateZeroPool (sizeof (*Dev));\r
+ Dev->Signature = XENBUS_DEVICE_SIGNATURE;\r
+ Dev->This = This;\r
+ Dev->ControllerHandle = ControllerHandle;\r
+ Dev->PciIo = PciIo;\r
+ Dev->DevicePath = DevicePath;\r
+ InitializeListHead (&Dev->ChildList);\r
+\r
+ EfiAcquireLock (&mMyDeviceLock);\r
+ if (mMyDevice != NULL) {\r
+ EfiReleaseLock (&mMyDeviceLock);\r
+ //\r
+ // There is already a XenBus running, only one can be used at a time.\r
+ //\r
+ Status = EFI_ALREADY_STARTED;\r
+ goto ErrorAllocated;\r
+ }\r
+ mMyDevice = Dev;\r
+ EfiReleaseLock (&mMyDeviceLock);\r
+\r
+ //\r
+ // The BAR1 of this PCI device is used for shared memory and is supposed to\r
+ // look like MMIO. The address space of the BAR1 will be used to map the\r
+ // Grant Table.\r
+ //\r
+ Status = PciIo->GetBarAttributes (PciIo, PCI_BAR_IDX1, NULL, (VOID**) &BarDesc);\r
+ ASSERT_EFI_ERROR (Status);\r
+ ASSERT (BarDesc->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM);\r
+\r
+ /* Get a Memory address for mapping the Grant Table. */\r
+ DEBUG ((EFI_D_INFO, "XenBus: BAR at %LX\n", BarDesc->AddrRangeMin));\r
+ MmioAddr = BarDesc->AddrRangeMin;\r
+ FreePool (BarDesc);\r
+\r
+ Status = XenGetSharedInfoPage (Dev);\r
+ if (EFI_ERROR (Status)) {\r
+ DEBUG ((EFI_D_ERROR, "XenBus: Unable to get the shared info page.\n"));\r
+ Status = EFI_UNSUPPORTED;\r
+ goto ErrorAllocated;\r
+ }\r
+\r
+ XenGrantTableInit (Dev, MmioAddr);\r
+\r
+ Status = XenStoreInit (Dev);\r
+ ASSERT_EFI_ERROR (Status);\r
+\r
+ XenBusEnumerateBus (Dev);\r
+\r
+ Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_CALLBACK,\r
+ NotifyExitBoot,\r
+ (VOID*) Dev,\r
+ &Dev->ExitBootEvent);\r
+ ASSERT_EFI_ERROR (Status);\r
+\r
+ return EFI_SUCCESS;\r
+\r
+ErrorAllocated:\r
+ FreePool (Dev);\r
+ gBS->CloseProtocol (ControllerHandle, &gEfiDevicePathProtocolGuid,\r
+ This->DriverBindingHandle, ControllerHandle);\r
+ErrorOpenningProtocol:\r
+ gBS->CloseProtocol (ControllerHandle, &gEfiPciIoProtocolGuid,\r
+ This->DriverBindingHandle, ControllerHandle);\r
+ return Status;\r