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1 | /** @file\r | |
2 | Functions implementation for Bus Specific Driver Override protocol.\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>\r | |
5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
6 | \r | |
7 | **/\r | |
8 | \r | |
9 | #include "PciBus.h"\r | |
10 | \r | |
11 | /**\r | |
12 | Initializes a PCI Driver Override Instance.\r | |
13 | \r | |
14 | @param PciIoDevice PCI Device instance.\r | |
15 | \r | |
16 | **/\r | |
17 | VOID\r | |
18 | InitializePciDriverOverrideInstance (\r | |
19 | IN OUT PCI_IO_DEVICE *PciIoDevice\r | |
20 | )\r | |
21 | {\r | |
22 | PciIoDevice->PciDriverOverride.GetDriver = GetDriver;\r | |
23 | }\r | |
24 | \r | |
25 | /**\r | |
26 | Find the image handle whose path equals to ImagePath.\r | |
27 | \r | |
28 | @param ImagePath Image path.\r | |
29 | \r | |
30 | @return Image handle.\r | |
31 | **/\r | |
32 | EFI_HANDLE\r | |
33 | LocateImageHandle (\r | |
34 | IN EFI_DEVICE_PATH_PROTOCOL *ImagePath\r | |
35 | )\r | |
36 | {\r | |
37 | EFI_STATUS Status;\r | |
38 | EFI_HANDLE *Handles;\r | |
39 | UINTN Index;\r | |
40 | UINTN HandleNum;\r | |
41 | EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r | |
42 | UINTN ImagePathSize;\r | |
43 | EFI_HANDLE ImageHandle;\r | |
44 | \r | |
45 | Status = gBS->LocateHandleBuffer (\r | |
46 | ByProtocol,\r | |
47 | &gEfiLoadedImageDevicePathProtocolGuid,\r | |
48 | NULL,\r | |
49 | &HandleNum,\r | |
50 | &Handles\r | |
51 | );\r | |
52 | if (EFI_ERROR (Status)) {\r | |
53 | return NULL;\r | |
54 | }\r | |
55 | \r | |
56 | ImageHandle = NULL;\r | |
57 | ImagePathSize = GetDevicePathSize (ImagePath);\r | |
58 | \r | |
59 | for (Index = 0; Index < HandleNum; Index++) {\r | |
60 | Status = gBS->HandleProtocol (Handles[Index], &gEfiLoadedImageDevicePathProtocolGuid, (VOID **)&DevicePath);\r | |
61 | if (EFI_ERROR (Status)) {\r | |
62 | continue;\r | |
63 | }\r | |
64 | \r | |
65 | if ((ImagePathSize == GetDevicePathSize (DevicePath)) &&\r | |
66 | (CompareMem (ImagePath, DevicePath, ImagePathSize) == 0)\r | |
67 | )\r | |
68 | {\r | |
69 | ImageHandle = Handles[Index];\r | |
70 | break;\r | |
71 | }\r | |
72 | }\r | |
73 | \r | |
74 | FreePool (Handles);\r | |
75 | return ImageHandle;\r | |
76 | }\r | |
77 | \r | |
78 | /**\r | |
79 | Uses a bus specific algorithm to retrieve a driver image handle for a controller.\r | |
80 | \r | |
81 | @param This A pointer to the EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_PROTOCOL instance.\r | |
82 | @param DriverImageHandle On input, a pointer to the previous driver image handle returned\r | |
83 | by GetDriver(). On output, a pointer to the next driver\r | |
84 | image handle. Passing in a NULL, will return the first driver\r | |
85 | image handle.\r | |
86 | \r | |
87 | @retval EFI_SUCCESS A bus specific override driver is returned in DriverImageHandle.\r | |
88 | @retval EFI_NOT_FOUND The end of the list of override drivers was reached.\r | |
89 | A bus specific override driver is not returned in DriverImageHandle.\r | |
90 | @retval EFI_INVALID_PARAMETER DriverImageHandle is not a handle that was returned on a\r | |
91 | previous call to GetDriver().\r | |
92 | \r | |
93 | **/\r | |
94 | EFI_STATUS\r | |
95 | EFIAPI\r | |
96 | GetDriver (\r | |
97 | IN EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_PROTOCOL *This,\r | |
98 | IN OUT EFI_HANDLE *DriverImageHandle\r | |
99 | )\r | |
100 | {\r | |
101 | PCI_IO_DEVICE *PciIoDevice;\r | |
102 | LIST_ENTRY *Link;\r | |
103 | PCI_DRIVER_OVERRIDE_LIST *Override;\r | |
104 | BOOLEAN ReturnNext;\r | |
105 | \r | |
106 | Override = NULL;\r | |
107 | PciIoDevice = PCI_IO_DEVICE_FROM_PCI_DRIVER_OVERRIDE_THIS (This);\r | |
108 | ReturnNext = (BOOLEAN)(*DriverImageHandle == NULL);\r | |
109 | for ( Link = GetFirstNode (&PciIoDevice->OptionRomDriverList)\r | |
110 | ; !IsNull (&PciIoDevice->OptionRomDriverList, Link)\r | |
111 | ; Link = GetNextNode (&PciIoDevice->OptionRomDriverList, Link)\r | |
112 | )\r | |
113 | {\r | |
114 | Override = DRIVER_OVERRIDE_FROM_LINK (Link);\r | |
115 | \r | |
116 | if (ReturnNext) {\r | |
117 | if (Override->DriverImageHandle == NULL) {\r | |
118 | Override->DriverImageHandle = LocateImageHandle (Override->DriverImagePath);\r | |
119 | }\r | |
120 | \r | |
121 | if (Override->DriverImageHandle == NULL) {\r | |
122 | //\r | |
123 | // The Option ROM identified by Override->DriverImagePath is not loaded.\r | |
124 | //\r | |
125 | continue;\r | |
126 | } else {\r | |
127 | *DriverImageHandle = Override->DriverImageHandle;\r | |
128 | return EFI_SUCCESS;\r | |
129 | }\r | |
130 | }\r | |
131 | \r | |
132 | if (*DriverImageHandle == Override->DriverImageHandle) {\r | |
133 | ReturnNext = TRUE;\r | |
134 | }\r | |
135 | }\r | |
136 | \r | |
137 | ASSERT (IsNull (&PciIoDevice->OptionRomDriverList, Link));\r | |
138 | //\r | |
139 | // ReturnNext indicates a handle match happens.\r | |
140 | // If all nodes are checked without handle match happening,\r | |
141 | // the DriverImageHandle should be a invalid handle.\r | |
142 | //\r | |
143 | if (ReturnNext) {\r | |
144 | return EFI_NOT_FOUND;\r | |
145 | } else {\r | |
146 | return EFI_INVALID_PARAMETER;\r | |
147 | }\r | |
148 | }\r | |
149 | \r | |
150 | /**\r | |
151 | Add an overriding driver image.\r | |
152 | \r | |
153 | @param PciIoDevice Instance of PciIo device.\r | |
154 | @param DriverImageHandle Image handle of newly added driver image.\r | |
155 | @param DriverImagePath Device path of newly added driver image.\r | |
156 | \r | |
157 | @retval EFI_SUCCESS Successfully added driver.\r | |
158 | @retval EFI_OUT_OF_RESOURCES No memory resource for new driver instance.\r | |
159 | @retval other Some error occurred when locating gEfiLoadedImageProtocolGuid.\r | |
160 | \r | |
161 | **/\r | |
162 | EFI_STATUS\r | |
163 | AddDriver (\r | |
164 | IN PCI_IO_DEVICE *PciIoDevice,\r | |
165 | IN EFI_HANDLE DriverImageHandle,\r | |
166 | IN EFI_DEVICE_PATH_PROTOCOL *DriverImagePath\r | |
167 | )\r | |
168 | {\r | |
169 | PCI_DRIVER_OVERRIDE_LIST *Node;\r | |
170 | \r | |
171 | //\r | |
172 | // Caller should pass in either Image Handle or Image Path, but not both.\r | |
173 | //\r | |
174 | ASSERT ((DriverImageHandle == NULL) || (DriverImagePath == NULL));\r | |
175 | \r | |
176 | Node = AllocateZeroPool (sizeof (PCI_DRIVER_OVERRIDE_LIST));\r | |
177 | if (Node == NULL) {\r | |
178 | return EFI_OUT_OF_RESOURCES;\r | |
179 | }\r | |
180 | \r | |
181 | Node->Signature = DRIVER_OVERRIDE_SIGNATURE;\r | |
182 | Node->DriverImageHandle = DriverImageHandle;\r | |
183 | Node->DriverImagePath = DuplicateDevicePath (DriverImagePath);\r | |
184 | \r | |
185 | InsertTailList (&PciIoDevice->OptionRomDriverList, &Node->Link);\r | |
186 | \r | |
187 | PciIoDevice->BusOverride = TRUE;\r | |
188 | return EFI_SUCCESS;\r | |
189 | }\r |