projects / mirror_edk2.git / blame
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|---|---|---|
| 4af04335 DB |
1 | /** @file\r |
| 2 | Utility routines used by boot maintenance modules.\r | |
| 3 | \r | |
| d1102dba | 4 | Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>\r |
| 9d510e61 | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 4af04335 DB |
6 | \r |
| 7 | **/\r | |
| 8 | \r | |
| 9 | #include "BootMaintenanceManager.h"\r | |
| 10 | \r | |
| 11 | /**\r | |
| 12 | Function deletes the variable specified by VarName and VarGuid.\r | |
| 13 | \r | |
| 14 | @param VarName A Null-terminated Unicode string that is\r | |
| 15 | the name of the vendor's variable.\r | |
| 16 | \r | |
| 17 | @param VarGuid A unique identifier for the vendor.\r | |
| 18 | \r | |
| 19 | @retval EFI_SUCCESS The variable was found and removed\r | |
| 20 | @retval EFI_UNSUPPORTED The variable store was inaccessible\r | |
| 21 | @retval EFI_NOT_FOUND The variable was not found\r | |
| 22 | \r | |
| 23 | **/\r | |
| 24 | EFI_STATUS\r | |
| 25 | EfiLibDeleteVariable (\r | |
| 26 | IN CHAR16 *VarName,\r | |
| 27 | IN EFI_GUID *VarGuid\r | |
| 28 | )\r | |
| 29 | {\r | |
| 30 | return gRT->SetVariable (\r | |
| 31 | VarName,\r | |
| 32 | VarGuid,\r | |
| 33 | 0,\r | |
| 34 | 0,\r | |
| 35 | NULL\r | |
| 36 | );\r | |
| 37 | }\r | |
| 38 | \r | |
| 39 | /**\r | |
| 40 | Function is used to determine the number of device path instances\r | |
| 41 | that exist in a device path.\r | |
| 42 | \r | |
| 43 | \r | |
| 44 | @param DevicePath A pointer to a device path data structure.\r | |
| 45 | \r | |
| 46 | @return This function counts and returns the number of device path instances\r | |
| 47 | in DevicePath.\r | |
| 48 | \r | |
| 49 | **/\r | |
| 50 | UINTN\r | |
| 51 | EfiDevicePathInstanceCount (\r | |
| 52 | IN EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
| 53 | )\r | |
| 54 | {\r | |
| 55 | UINTN Count;\r | |
| 56 | UINTN Size;\r | |
| 57 | \r | |
| 58 | Count = 0;\r | |
| 59 | while (GetNextDevicePathInstance (&DevicePath, &Size) != NULL) {\r | |
| 60 | Count += 1;\r | |
| 61 | }\r | |
| 62 | \r | |
| 63 | return Count;\r | |
| 64 | }\r | |
| 65 | \r | |
| 66 | /**\r | |
| d1102dba | 67 | Get a string from the Data Hub record based on\r |
| 4af04335 DB |
68 | a device path.\r |
| 69 | \r | |
| 70 | @param DevPath The device Path.\r | |
| 71 | \r | |
| 72 | @return A string located from the Data Hub records based on\r | |
| 73 | the device path.\r | |
| 74 | @retval NULL If failed to get the String from Data Hub.\r | |
| 75 | \r | |
| 76 | **/\r | |
| 77 | UINT16 *\r | |
| 78 | EfiLibStrFromDatahub (\r | |
| 79 | IN EFI_DEVICE_PATH_PROTOCOL *DevPath\r | |
| 80 | )\r | |
| 81 | {\r | |
| 82 | return NULL;\r | |
| 83 | }\r |