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245bdd2c RC |
1 | /** @file\r |
2 | \r | |
3 | Null implementation of the fw_cfg library.\r | |
4 | \r | |
5 | Copyright (C) 2020, Rebecca Cran <rebecca@bsdio.com>\r | |
6 | Copyright (C) 2013, Red Hat, Inc.\r | |
7 | Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>\r | |
8 | Copyright (c) 2017, Advanced Micro Devices. All rights reserved.<BR>\r | |
9 | \r | |
10 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
11 | **/\r | |
12 | \r | |
13 | #include <Library/DebugLib.h>\r | |
14 | #include <Library/QemuFwCfgLib.h>\r | |
15 | \r | |
16 | /**\r | |
17 | Returns a boolean indicating if the firmware configuration interface\r | |
18 | is available or not.\r | |
19 | \r | |
20 | This function may change fw_cfg state.\r | |
21 | \r | |
22 | @retval TRUE The interface is available\r | |
23 | @retval FALSE The interface is not available\r | |
24 | \r | |
25 | **/\r | |
26 | BOOLEAN\r | |
27 | EFIAPI\r | |
28 | QemuFwCfgIsAvailable (\r | |
29 | VOID\r | |
30 | )\r | |
31 | {\r | |
32 | return FALSE;\r | |
33 | }\r | |
34 | \r | |
245bdd2c RC |
35 | /**\r |
36 | Selects a firmware configuration item for reading.\r | |
37 | \r | |
38 | Following this call, any data read from this item will start from\r | |
39 | the beginning of the configuration item's data.\r | |
40 | \r | |
41 | @param[in] QemuFwCfgItem - Firmware Configuration item to read\r | |
42 | \r | |
43 | **/\r | |
44 | VOID\r | |
45 | EFIAPI\r | |
46 | QemuFwCfgSelectItem (\r | |
ac0a286f | 47 | IN FIRMWARE_CONFIG_ITEM QemuFwCfgItem\r |
245bdd2c RC |
48 | )\r |
49 | {\r | |
50 | ASSERT (FALSE);\r | |
51 | }\r | |
52 | \r | |
245bdd2c RC |
53 | /**\r |
54 | Reads firmware configuration bytes into a buffer\r | |
55 | \r | |
56 | If called multiple times, then the data read will\r | |
57 | continue at the offset of the firmware configuration\r | |
58 | item where the previous read ended.\r | |
59 | \r | |
60 | @param[in] Size - Size in bytes to read\r | |
61 | @param[in] Buffer - Buffer to store data into\r | |
62 | \r | |
63 | **/\r | |
64 | VOID\r | |
65 | EFIAPI\r | |
66 | QemuFwCfgReadBytes (\r | |
ac0a286f MK |
67 | IN UINTN Size,\r |
68 | IN VOID *Buffer OPTIONAL\r | |
245bdd2c RC |
69 | )\r |
70 | {\r | |
71 | ASSERT (FALSE);\r | |
72 | }\r | |
73 | \r | |
245bdd2c RC |
74 | /**\r |
75 | Writes firmware configuration bytes from a buffer\r | |
76 | \r | |
77 | If called multiple times, then the data written will\r | |
78 | continue at the offset of the firmware configuration\r | |
79 | item where the previous write ended.\r | |
80 | \r | |
81 | @param[in] Size - Size in bytes to write\r | |
82 | @param[in] Buffer - Buffer to read data from\r | |
83 | \r | |
84 | **/\r | |
85 | VOID\r | |
86 | EFIAPI\r | |
87 | QemuFwCfgWriteBytes (\r | |
ac0a286f MK |
88 | IN UINTN Size,\r |
89 | IN VOID *Buffer\r | |
245bdd2c RC |
90 | )\r |
91 | {\r | |
92 | ASSERT (FALSE);\r | |
93 | }\r | |
94 | \r | |
245bdd2c RC |
95 | /**\r |
96 | Skip bytes in the firmware configuration item.\r | |
97 | \r | |
98 | Increase the offset of the firmware configuration item without transferring\r | |
99 | bytes between the item and a caller-provided buffer. Subsequent read, write\r | |
100 | or skip operations will commence at the increased offset.\r | |
101 | \r | |
102 | @param[in] Size Number of bytes to skip.\r | |
103 | **/\r | |
104 | VOID\r | |
105 | EFIAPI\r | |
106 | QemuFwCfgSkipBytes (\r | |
ac0a286f | 107 | IN UINTN Size\r |
245bdd2c RC |
108 | )\r |
109 | {\r | |
110 | ASSERT (FALSE);\r | |
111 | }\r | |
112 | \r | |
245bdd2c RC |
113 | /**\r |
114 | Reads a UINT8 firmware configuration value\r | |
115 | \r | |
116 | @return Value of Firmware Configuration item read\r | |
117 | \r | |
118 | **/\r | |
119 | UINT8\r | |
120 | EFIAPI\r | |
121 | QemuFwCfgRead8 (\r | |
122 | VOID\r | |
123 | )\r | |
124 | {\r | |
125 | ASSERT (FALSE);\r | |
126 | return 0;\r | |
127 | }\r | |
128 | \r | |
245bdd2c RC |
129 | /**\r |
130 | Reads a UINT16 firmware configuration value\r | |
131 | \r | |
132 | @return Value of Firmware Configuration item read\r | |
133 | \r | |
134 | **/\r | |
135 | UINT16\r | |
136 | EFIAPI\r | |
137 | QemuFwCfgRead16 (\r | |
138 | VOID\r | |
139 | )\r | |
140 | {\r | |
141 | ASSERT (FALSE);\r | |
142 | return 0;\r | |
143 | }\r | |
144 | \r | |
245bdd2c RC |
145 | /**\r |
146 | Reads a UINT32 firmware configuration value\r | |
147 | \r | |
148 | @return Value of Firmware Configuration item read\r | |
149 | \r | |
150 | **/\r | |
151 | UINT32\r | |
152 | EFIAPI\r | |
153 | QemuFwCfgRead32 (\r | |
154 | VOID\r | |
155 | )\r | |
156 | {\r | |
157 | ASSERT (FALSE);\r | |
158 | return 0;\r | |
159 | }\r | |
160 | \r | |
245bdd2c RC |
161 | /**\r |
162 | Reads a UINT64 firmware configuration value\r | |
163 | \r | |
164 | @return Value of Firmware Configuration item read\r | |
165 | \r | |
166 | **/\r | |
167 | UINT64\r | |
168 | EFIAPI\r | |
169 | QemuFwCfgRead64 (\r | |
170 | VOID\r | |
171 | )\r | |
172 | {\r | |
173 | ASSERT (FALSE);\r | |
174 | return 0;\r | |
175 | }\r | |
176 | \r | |
245bdd2c RC |
177 | /**\r |
178 | Find the configuration item corresponding to the firmware configuration file.\r | |
179 | \r | |
180 | @param[in] Name - Name of file to look up.\r | |
181 | @param[out] Item - Configuration item corresponding to the file, to be passed\r | |
182 | to QemuFwCfgSelectItem ().\r | |
183 | @param[out] Size - Number of bytes in the file.\r | |
184 | \r | |
185 | @return RETURN_SUCCESS If file is found.\r | |
186 | RETURN_NOT_FOUND If file is not found.\r | |
187 | RETURN_UNSUPPORTED If firmware configuration is unavailable.\r | |
188 | \r | |
189 | **/\r | |
190 | RETURN_STATUS\r | |
191 | EFIAPI\r | |
192 | QemuFwCfgFindFile (\r | |
193 | IN CONST CHAR8 *Name,\r | |
194 | OUT FIRMWARE_CONFIG_ITEM *Item,\r | |
195 | OUT UINTN *Size\r | |
196 | )\r | |
197 | {\r | |
198 | return RETURN_UNSUPPORTED;\r | |
199 | }\r |