}\r
\r
\r
+/**\r
+ Connect devices based on the boot order retrieved from QEMU.\r
+\r
+ Attempt to retrieve the "bootorder" fw_cfg file from QEMU. Translate the\r
+ OpenFirmware device paths therein to UEFI device path fragments. Connect the\r
+ devices identified by the UEFI devpath prefixes as narrowly as possible, then\r
+ connect all their child devices, recursively.\r
+\r
+ If this function fails, then platform BDS should fall back to\r
+ EfiBootManagerConnectAll(), or some other method for connecting any expected\r
+ boot devices.\r
+\r
+ @retval RETURN_SUCCESS The "bootorder" fw_cfg file has been\r
+ parsed, and the referenced device-subtrees\r
+ have been connected.\r
+\r
+ @retval RETURN_UNSUPPORTED QEMU's fw_cfg is not supported.\r
+\r
+ @retval RETURN_NOT_FOUND Empty or nonexistent "bootorder" fw_cfg\r
+ file.\r
+\r
+ @retval RETURN_INVALID_PARAMETER Parse error in the "bootorder" fw_cfg file.\r
+\r
+ @retval RETURN_OUT_OF_RESOURCES Memory allocation failed.\r
+\r
+ @return Error statuses propagated from underlying\r
+ functions.\r
+**/\r
+RETURN_STATUS\r
+EFIAPI\r
+ConnectDevicesFromQemu (\r
+ VOID\r
+ )\r
+{\r
+ RETURN_STATUS Status;\r
+ FIRMWARE_CONFIG_ITEM FwCfgItem;\r
+ UINTN FwCfgSize;\r
+ CHAR8 *FwCfg;\r
+ EFI_STATUS EfiStatus;\r
+ EXTRA_ROOT_BUS_MAP *ExtraPciRoots;\r
+ CONST CHAR8 *FwCfgPtr;\r
+ UINTN NumConnected;\r
+ UINTN TranslatedSize;\r
+ CHAR16 Translated[TRANSLATION_OUTPUT_SIZE];\r
+\r
+ Status = QemuFwCfgFindFile ("bootorder", &FwCfgItem, &FwCfgSize);\r
+ if (RETURN_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+\r
+ if (FwCfgSize == 0) {\r
+ return RETURN_NOT_FOUND;\r
+ }\r
+\r
+ FwCfg = AllocatePool (FwCfgSize);\r
+ if (FwCfg == NULL) {\r
+ return RETURN_OUT_OF_RESOURCES;\r
+ }\r
+\r
+ QemuFwCfgSelectItem (FwCfgItem);\r
+ QemuFwCfgReadBytes (FwCfgSize, FwCfg);\r
+ if (FwCfg[FwCfgSize - 1] != '\0') {\r
+ Status = RETURN_INVALID_PARAMETER;\r
+ goto FreeFwCfg;\r
+ }\r
+ DEBUG ((DEBUG_VERBOSE, "%a: FwCfg:\n", __FUNCTION__));\r
+ DEBUG ((DEBUG_VERBOSE, "%a\n", FwCfg));\r
+ DEBUG ((DEBUG_VERBOSE, "%a: FwCfg: <end>\n", __FUNCTION__));\r
+\r
+ if (FeaturePcdGet (PcdQemuBootOrderPciTranslation)) {\r
+ EfiStatus = CreateExtraRootBusMap (&ExtraPciRoots);\r
+ if (EFI_ERROR (EfiStatus)) {\r
+ Status = (RETURN_STATUS)EfiStatus;\r
+ goto FreeFwCfg;\r
+ }\r
+ } else {\r
+ ExtraPciRoots = NULL;\r
+ }\r
+\r
+ //\r
+ // Translate each OpenFirmware path to a UEFI devpath prefix.\r
+ //\r
+ FwCfgPtr = FwCfg;\r
+ NumConnected = 0;\r
+ TranslatedSize = ARRAY_SIZE (Translated);\r
+ Status = TranslateOfwPath (&FwCfgPtr, ExtraPciRoots, Translated,\r
+ &TranslatedSize);\r
+ while (!RETURN_ERROR (Status)) {\r
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r
+ EFI_HANDLE Controller;\r
+\r
+ //\r
+ // Convert the UEFI devpath prefix to binary representation.\r
+ //\r
+ ASSERT (Translated[TranslatedSize] == L'\0');\r
+ DevicePath = ConvertTextToDevicePath (Translated);\r
+ if (DevicePath == NULL) {\r
+ Status = RETURN_OUT_OF_RESOURCES;\r
+ goto FreeExtraPciRoots;\r
+ }\r
+ //\r
+ // Advance along DevicePath, connecting the nodes individually, and asking\r
+ // drivers not to produce sibling nodes. Retrieve the controller handle\r
+ // associated with the full DevicePath -- this is the device that QEMU's\r
+ // OFW devpath refers to.\r
+ //\r
+ EfiStatus = EfiBootManagerConnectDevicePath (DevicePath, &Controller);\r
+ FreePool (DevicePath);\r
+ if (EFI_ERROR (EfiStatus)) {\r
+ Status = (RETURN_STATUS)EfiStatus;\r
+ goto FreeExtraPciRoots;\r
+ }\r
+ //\r
+ // Because QEMU's OFW devpaths have lesser expressive power than UEFI\r
+ // devpaths (i.e., DevicePath is considered a prefix), connect the tree\r
+ // rooted at Controller, recursively. If no children are produced\r
+ // (EFI_NOT_FOUND), that's OK.\r
+ //\r
+ EfiStatus = gBS->ConnectController (Controller, NULL, NULL, TRUE);\r
+ if (EFI_ERROR (EfiStatus) && EfiStatus != EFI_NOT_FOUND) {\r
+ Status = (RETURN_STATUS)EfiStatus;\r
+ goto FreeExtraPciRoots;\r
+ }\r
+ ++NumConnected;\r
+ //\r
+ // Move to the next OFW devpath.\r
+ //\r
+ TranslatedSize = ARRAY_SIZE (Translated);\r
+ Status = TranslateOfwPath (&FwCfgPtr, ExtraPciRoots, Translated,\r
+ &TranslatedSize);\r
+ }\r
+\r
+ if (Status == RETURN_NOT_FOUND && NumConnected > 0) {\r
+ DEBUG ((DEBUG_INFO, "%a: %Lu OpenFirmware device path(s) connected\n",\r
+ __FUNCTION__, (UINT64)NumConnected));\r
+ Status = RETURN_SUCCESS;\r
+ }\r
+\r
+FreeExtraPciRoots:\r
+ if (ExtraPciRoots != NULL) {\r
+ DestroyExtraRootBusMap (ExtraPciRoots);\r
+ }\r
+\r
+FreeFwCfg:\r
+ FreePool (FwCfg);\r
+\r
+ return Status;\r
+}\r
+\r
+\r
/**\r
\r
Convert the UEFI DevicePath to full text representation with DevPathToText,\r
translated fragments against the current list of boot options, and rewrite\r
the BootOrder NvVar so that it corresponds to the order described in fw_cfg.\r
\r
- Platform BDS should call this function after EfiBootManagerConnectAll () and\r
- EfiBootManagerRefreshAllBootOption () return.\r
+ Platform BDS should call this function after connecting any expected boot\r
+ devices and calling EfiBootManagerRefreshAllBootOption ().\r
\r
@retval RETURN_SUCCESS BootOrder NvVar rewritten.\r
\r
projects / mirror_edk2.git / blobdiff