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20752cb8 HW |
1 | /** @file\r |
2 | The driver entry point for RamDiskDxe driver.\r | |
3 | \r | |
4 | Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. 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 | **/\r | |
14 | \r | |
15 | #include "RamDiskImpl.h"\r | |
16 | \r | |
17 | //\r | |
18 | // Handle for the EFI_RAM_DISK_PROTOCOL instance\r | |
19 | //\r | |
20 | EFI_HANDLE mRamDiskHandle = NULL;\r | |
21 | \r | |
22 | //\r | |
23 | // The EFI_RAM_DISK_PROTOCOL instances that is installed onto the driver\r | |
24 | // handle\r | |
25 | //\r | |
26 | EFI_RAM_DISK_PROTOCOL mRamDiskProtocol = {\r | |
27 | RamDiskRegister,\r | |
28 | RamDiskUnregister\r | |
29 | };\r | |
30 | \r | |
31 | //\r | |
32 | // RamDiskDxe driver maintains a list of registered RAM disks.\r | |
33 | //\r | |
34 | LIST_ENTRY RegisteredRamDisks;\r | |
35 | UINTN ListEntryNum;\r | |
36 | \r | |
37 | \r | |
38 | /**\r | |
39 | The entry point for RamDiskDxe driver.\r | |
40 | \r | |
41 | @param[in] ImageHandle The image handle of the driver.\r | |
42 | @param[in] SystemTable The system table.\r | |
43 | \r | |
44 | @retval EFI_ALREADY_STARTED The driver already exists in system.\r | |
45 | @retval EFI_OUT_OF_RESOURCES Fail to execute entry point due to lack of\r | |
46 | resources.\r | |
47 | @retval EFI_SUCCES All the related protocols are installed on\r | |
48 | the driver.\r | |
49 | \r | |
50 | **/\r | |
51 | EFI_STATUS\r | |
52 | EFIAPI\r | |
53 | RamDiskDxeEntryPoint (\r | |
54 | IN EFI_HANDLE ImageHandle,\r | |
55 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
56 | )\r | |
57 | {\r | |
58 | EFI_STATUS Status;\r | |
59 | RAM_DISK_CONFIG_PRIVATE_DATA *ConfigPrivate;\r | |
60 | VOID *DummyInterface;\r | |
61 | \r | |
62 | //\r | |
63 | // If already started, return.\r | |
64 | //\r | |
65 | Status = gBS->LocateProtocol (\r | |
66 | &gEfiRamDiskProtocolGuid,\r | |
67 | NULL,\r | |
68 | &DummyInterface\r | |
69 | );\r | |
70 | if (!EFI_ERROR (Status)) {\r | |
71 | DEBUG ((EFI_D_INFO, "Driver already started!\n"));\r | |
72 | return EFI_ALREADY_STARTED;\r | |
73 | }\r | |
74 | \r | |
75 | //\r | |
76 | // Create a private data structure.\r | |
77 | //\r | |
78 | ConfigPrivate = AllocateCopyPool (sizeof (RAM_DISK_CONFIG_PRIVATE_DATA), &mRamDiskConfigPrivateDataTemplate);\r | |
79 | if (ConfigPrivate == NULL) {\r | |
80 | return EFI_OUT_OF_RESOURCES;\r | |
81 | }\r | |
82 | \r | |
83 | //\r | |
84 | // Install RAM disk configuration form\r | |
85 | //\r | |
86 | Status = InstallRamDiskConfigForm (ConfigPrivate);\r | |
87 | if (EFI_ERROR (Status)) {\r | |
88 | goto ErrorExit;\r | |
89 | }\r | |
90 | \r | |
91 | //\r | |
92 | // Install the EFI_RAM_DISK_PROTOCOL and RAM disk private data onto a\r | |
93 | // new handle\r | |
94 | //\r | |
95 | Status = gBS->InstallMultipleProtocolInterfaces (\r | |
96 | &mRamDiskHandle,\r | |
97 | &gEfiRamDiskProtocolGuid,\r | |
98 | &mRamDiskProtocol,\r | |
99 | &gEfiCallerIdGuid,\r | |
100 | ConfigPrivate,\r | |
101 | NULL\r | |
102 | );\r | |
103 | if (EFI_ERROR (Status)) {\r | |
104 | goto ErrorExit;\r | |
105 | }\r | |
106 | \r | |
107 | //\r | |
108 | // Initialize the list of registered RAM disks maintained by the driver\r | |
109 | //\r | |
110 | InitializeListHead (&RegisteredRamDisks);\r | |
111 | \r | |
112 | return EFI_SUCCESS;\r | |
113 | \r | |
114 | ErrorExit:\r | |
115 | if (ConfigPrivate != NULL) {\r | |
116 | UninstallRamDiskConfigForm (ConfigPrivate);\r | |
117 | }\r | |
118 | \r | |
119 | return Status;\r | |
120 | }\r | |
121 | \r | |
122 | \r | |
123 | /**\r | |
124 | Unload the RamDiskDxe driver and its configuration form.\r | |
125 | \r | |
126 | @param[in] ImageHandle The driver's image handle.\r | |
127 | \r | |
128 | @retval EFI_SUCCESS The RamDiskDxe driver and its configuration\r | |
129 | form is unloaded.\r | |
130 | @retval Others Failed to unload the form.\r | |
131 | \r | |
132 | **/\r | |
133 | EFI_STATUS\r | |
134 | EFIAPI\r | |
135 | RamDiskDxeUnload (\r | |
136 | IN EFI_HANDLE ImageHandle\r | |
137 | )\r | |
138 | {\r | |
139 | EFI_STATUS Status;\r | |
140 | RAM_DISK_CONFIG_PRIVATE_DATA *ConfigPrivate;\r | |
141 | \r | |
142 | Status = gBS->HandleProtocol (\r | |
143 | mRamDiskHandle,\r | |
144 | &gEfiCallerIdGuid,\r | |
145 | (VOID **) &ConfigPrivate\r | |
146 | );\r | |
147 | if (EFI_ERROR (Status)) {\r | |
148 | return Status;\r | |
149 | }\r | |
150 | \r | |
151 | ASSERT (ConfigPrivate->Signature == RAM_DISK_CONFIG_PRIVATE_DATA_SIGNATURE);\r | |
152 | \r | |
153 | //\r | |
154 | // Unregister all registered RAM disks\r | |
155 | //\r | |
156 | UnregisterAllRamDisks ();\r | |
157 | \r | |
158 | gBS->UninstallMultipleProtocolInterfaces (\r | |
159 | mRamDiskHandle,\r | |
160 | &gEfiRamDiskProtocolGuid,\r | |
161 | &mRamDiskProtocol,\r | |
162 | &gEfiCallerIdGuid,\r | |
163 | ConfigPrivate,\r | |
164 | NULL\r | |
165 | );\r | |
166 | \r | |
167 | UninstallRamDiskConfigForm (ConfigPrivate);\r | |
168 | \r | |
169 | return EFI_SUCCESS;\r | |
170 | }\r |