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53e1e5c6 | 1 | /** @file\r |
2 | Device Abstraction: Search device list for a matching device.\r | |
3 | \r | |
4 | Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials are licensed and made available under\r | |
6 | the terms and conditions of the BSD License that accompanies this distribution.\r | |
7 | The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php.\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | **/\r | |
13 | #include <Uefi.h>\r | |
14 | #include <Library/BaseLib.h>\r | |
15 | #include <Library/BaseMemoryLib.h>\r | |
16 | \r | |
17 | #include <LibConfig.h>\r | |
18 | \r | |
19 | #include <errno.h>\r | |
20 | #include <kfile.h>\r | |
21 | #include <Device/Device.h>\r | |
22 | #include <MainData.h>\r | |
23 | \r | |
24 | /** Find a DeviceNode matching DevName or DevProto, or both.\r | |
25 | \r | |
26 | If DevName is NULL, then the device name is not used in the search.\r | |
27 | If DevProto is NULL, then the protocol GUID is not used in the search.\r | |
28 | If both are NULL, then INVALID_PARAMETER is returned.\r | |
29 | If both DevName and DevProto are specified, then both must match.\r | |
30 | If both are specified but only one matches, then DEVICE_ERROR is returned.\r | |
31 | \r | |
32 | @param DevName Name of the Device Abstraction to find.\r | |
33 | @param DevProto GUID of the Protocol associated with the Device Abstraction.\r | |
34 | @param Node Pointer to the pointer to receive the found Device Node's address.\r | |
35 | \r | |
36 | @retval RETURN_SUCCESS The desired Device Node was found.\r | |
37 | @retval RETURN_INVALID_PARAMETER Both DevName and DevProto are NULL or Node is NULL.\r | |
38 | @retval RETURN_DEVICE_ERROR DevName matched but DevProto did not.\r | |
39 | @retval RETURN_NOT_FOUND The desired device was not found.\r | |
40 | **/\r | |
41 | EFI_STATUS\r | |
42 | EFIAPI\r | |
43 | __DevSearch(\r | |
44 | IN CHAR16 *DevName,\r | |
45 | IN GUID *DevProto,\r | |
46 | OUT DeviceNode **Node\r | |
47 | )\r | |
48 | {\r | |
49 | RETURN_STATUS Status = RETURN_NOT_FOUND;\r | |
50 | DeviceNode *WorkNode;\r | |
51 | INT32 DevMatched;\r | |
52 | \r | |
53 | if(((DevName == NULL) && (DevProto == NULL)) || (Node == NULL)) {\r | |
54 | Status = RETURN_INVALID_PARAMETER;\r | |
55 | }\r | |
56 | else {\r | |
57 | if(IsListEmpty((LIST_ENTRY *)&daDeviceList)) {\r | |
58 | Status = RETURN_NOT_FOUND;\r | |
59 | }\r | |
60 | else {\r | |
61 | /* Traverse the list of Device Nodes hunting for a match */\r | |
62 | WorkNode = (DeviceNode *)GetFirstNode((LIST_ENTRY *)&daDeviceList);\r | |
63 | do {\r | |
64 | /* Use DevMatched to keep track of the three match conditions. */\r | |
65 | DevMatched = 0;\r | |
66 | if(DevName != NULL) {\r | |
67 | ++DevMatched;\r | |
68 | if(wcsncmp(DevName, WorkNode->DevName, wcslen(WorkNode->DevName)) == 0) {\r | |
69 | ++DevMatched;\r | |
70 | }\r | |
71 | }\r | |
72 | /* At this point, DevMatched has one of the following values:\r | |
73 | 0 DevName == NULL, no name comparison\r | |
74 | 1 DevName did not match WorkNode's name\r | |
75 | 2 DevName MATCHED\r | |
76 | */\r | |
77 | if((DevMatched != 1) && (DevProto != NULL) && (WorkNode->DevProto != NULL)) {\r | |
78 | /* Only bother with the GUID comparison if:\r | |
79 | * There was NOT a name mismatch\r | |
80 | * DevProto is NOT NULL -- there is a GUID to compare\r | |
81 | * WorkNode->DevProto is NOT NULL\r | |
82 | */\r | |
83 | if(CompareGuid(DevProto, WorkNode->DevProto)) {\r | |
84 | // GUIDs matched, we found it\r | |
85 | Status = RETURN_SUCCESS;\r | |
86 | *Node = WorkNode;\r | |
87 | break;\r | |
88 | }\r | |
89 | else {\r | |
90 | // GUIDs did not match\r | |
91 | if(DevMatched == 2) {\r | |
92 | // Name matched, GUID did not!\r | |
93 | Status = RETURN_DEVICE_ERROR;\r | |
94 | break; // Don't try any more, we have an internal problem\r | |
95 | }\r | |
96 | }\r | |
97 | }\r | |
98 | else {\r | |
99 | if(DevMatched == 2) {\r | |
100 | // Device Name matched, GUIDs skipped\r | |
101 | Status = RETURN_SUCCESS;\r | |
102 | *Node = WorkNode;\r | |
103 | break;\r | |
104 | }\r | |
105 | }\r | |
106 | // Check the next device in the list\r | |
107 | WorkNode = (DeviceNode *)GetNextNode(&daDeviceList, (LIST_ENTRY *)WorkNode);\r | |
108 | } while(&daDeviceList != (LIST_ENTRY *)WorkNode);\r | |
109 | }\r | |
110 | }\r | |
111 | return Status;\r | |
112 | }\r |