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f1ec65ba | 1 | /** @file\r |
2 | \r | |
29874a8c | 3 | Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>\r |
0dc231c9 | 4 | Copyright (C) 2013, Red Hat, Inc.\r |
2b631390 | 5 | Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r |
f1ec65ba | 6 | \r |
7 | This program and the accompanying materials\r | |
8 | are licensed and made available under the terms and conditions of the BSD License\r | |
9 | which accompanies this distribution. The full text of the license may be found at\r | |
10 | http://opensource.org/licenses/bsd-license.php\r | |
11 | \r | |
12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
13 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
14 | \r | |
15 | **/\r | |
16 | \r | |
17 | #include "Uefi.h"\r | |
18 | #include <Library/BaseLib.h>\r | |
19 | #include <Library/BaseMemoryLib.h>\r | |
20 | #include <Library/DebugLib.h>\r | |
21 | #include <Library/IoLib.h>\r | |
22 | #include <Library/QemuFwCfgLib.h>\r | |
23 | #include <Library/MemoryAllocationLib.h>\r | |
24 | #include <Library/UefiBootServicesTableLib.h>\r | |
25 | \r | |
5297c0bf LE |
26 | #include "QemuFwCfgLibInternal.h"\r |
27 | \r | |
f1ec65ba | 28 | \r |
f1ec65ba | 29 | /**\r |
30 | Selects a firmware configuration item for reading.\r | |
31 | \r | |
32 | Following this call, any data read from this item will start from\r | |
33 | the beginning of the configuration item's data.\r | |
34 | \r | |
35 | @param[in] QemuFwCfgItem - Firmware Configuration item to read\r | |
36 | \r | |
37 | **/\r | |
38 | VOID\r | |
39 | EFIAPI\r | |
40 | QemuFwCfgSelectItem (\r | |
41 | IN FIRMWARE_CONFIG_ITEM QemuFwCfgItem\r | |
42 | )\r | |
43 | {\r | |
44 | DEBUG ((EFI_D_INFO, "Select Item: 0x%x\n", (UINT16)(UINTN) QemuFwCfgItem));\r | |
21ca2f28 | 45 | IoWrite16 (FW_CFG_IO_SELECTOR, (UINT16)(UINTN) QemuFwCfgItem);\r |
f1ec65ba | 46 | }\r |
47 | \r | |
f1ec65ba | 48 | /**\r |
49 | Reads firmware configuration bytes into a buffer\r | |
50 | \r | |
51 | @param[in] Size - Size in bytes to read\r | |
52 | @param[in] Buffer - Buffer to store data into (OPTIONAL if Size is 0)\r | |
53 | \r | |
54 | **/\r | |
55 | VOID\r | |
56 | EFIAPI\r | |
57 | InternalQemuFwCfgReadBytes (\r | |
58 | IN UINTN Size,\r | |
59 | IN VOID *Buffer OPTIONAL\r | |
60 | )\r | |
61 | {\r | |
2c8dcbc6 | 62 | if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {\r |
d055601e | 63 | InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, FW_CFG_DMA_CTL_READ);\r |
2c8dcbc6 LE |
64 | return;\r |
65 | }\r | |
509e6b5a | 66 | IoReadFifo8 (FW_CFG_IO_DATA, Size, Buffer);\r |
f1ec65ba | 67 | }\r |
68 | \r | |
69 | \r | |
70 | /**\r | |
71 | Reads firmware configuration bytes into a buffer\r | |
72 | \r | |
73 | If called multiple times, then the data read will\r | |
74 | continue at the offset of the firmware configuration\r | |
75 | item where the previous read ended.\r | |
76 | \r | |
77 | @param[in] Size - Size in bytes to read\r | |
78 | @param[in] Buffer - Buffer to store data into\r | |
79 | \r | |
80 | **/\r | |
81 | VOID\r | |
82 | EFIAPI\r | |
83 | QemuFwCfgReadBytes (\r | |
84 | IN UINTN Size,\r | |
85 | IN VOID *Buffer\r | |
86 | )\r | |
87 | {\r | |
0dc231c9 | 88 | if (InternalQemuFwCfgIsAvailable ()) {\r |
f1ec65ba | 89 | InternalQemuFwCfgReadBytes (Size, Buffer);\r |
90 | } else {\r | |
91 | ZeroMem (Buffer, Size);\r | |
92 | }\r | |
93 | }\r | |
94 | \r | |
29874a8c | 95 | /**\r |
96 | Write firmware configuration bytes from a buffer\r | |
97 | \r | |
98 | If called multiple times, then the data written will\r | |
99 | continue at the offset of the firmware configuration\r | |
100 | item where the previous write ended.\r | |
101 | \r | |
102 | @param[in] Size - Size in bytes to write\r | |
103 | @param[in] Buffer - Buffer to read data from\r | |
104 | \r | |
105 | **/\r | |
106 | VOID\r | |
107 | EFIAPI\r | |
108 | QemuFwCfgWriteBytes (\r | |
109 | IN UINTN Size,\r | |
110 | IN VOID *Buffer\r | |
111 | )\r | |
112 | {\r | |
0dc231c9 | 113 | if (InternalQemuFwCfgIsAvailable ()) {\r |
2c8dcbc6 | 114 | if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {\r |
d055601e | 115 | InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, FW_CFG_DMA_CTL_WRITE);\r |
2c8dcbc6 LE |
116 | return;\r |
117 | }\r | |
509e6b5a | 118 | IoWriteFifo8 (FW_CFG_IO_DATA, Size, Buffer);\r |
29874a8c | 119 | }\r |
120 | }\r | |
121 | \r | |
f1ec65ba | 122 | \r |
fcca9f67 LE |
123 | /**\r |
124 | Skip bytes in the firmware configuration item.\r | |
125 | \r | |
126 | Increase the offset of the firmware configuration item without transferring\r | |
127 | bytes between the item and a caller-provided buffer. Subsequent read, write\r | |
128 | or skip operations will commence at the increased offset.\r | |
129 | \r | |
130 | @param[in] Size Number of bytes to skip.\r | |
131 | **/\r | |
132 | VOID\r | |
133 | EFIAPI\r | |
134 | QemuFwCfgSkipBytes (\r | |
135 | IN UINTN Size\r | |
136 | )\r | |
137 | {\r | |
138 | UINTN ChunkSize;\r | |
139 | UINT8 SkipBuffer[256];\r | |
140 | \r | |
141 | if (!InternalQemuFwCfgIsAvailable ()) {\r | |
142 | return;\r | |
143 | }\r | |
144 | \r | |
145 | if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {\r | |
146 | InternalQemuFwCfgDmaBytes ((UINT32)Size, NULL, FW_CFG_DMA_CTL_SKIP);\r | |
147 | return;\r | |
148 | }\r | |
149 | \r | |
150 | //\r | |
151 | // Emulate the skip by reading data in chunks, and throwing it away. The\r | |
152 | // implementation below is suitable even for phases where RAM or dynamic\r | |
153 | // allocation is not available or appropriate. It also doesn't affect the\r | |
154 | // static data footprint for client modules. Large skips are not expected,\r | |
155 | // therefore this fallback is not performance critical. The size of\r | |
156 | // SkipBuffer is thought not to exert a large pressure on the stack in any\r | |
157 | // phase.\r | |
158 | //\r | |
159 | while (Size > 0) {\r | |
160 | ChunkSize = MIN (Size, sizeof SkipBuffer);\r | |
509e6b5a | 161 | IoReadFifo8 (FW_CFG_IO_DATA, ChunkSize, SkipBuffer);\r |
fcca9f67 LE |
162 | Size -= ChunkSize;\r |
163 | }\r | |
164 | }\r | |
165 | \r | |
166 | \r | |
f1ec65ba | 167 | /**\r |
168 | Reads a UINT8 firmware configuration value\r | |
169 | \r | |
170 | @return Value of Firmware Configuration item read\r | |
171 | \r | |
172 | **/\r | |
173 | UINT8\r | |
174 | EFIAPI\r | |
175 | QemuFwCfgRead8 (\r | |
176 | VOID\r | |
177 | )\r | |
178 | {\r | |
179 | UINT8 Result;\r | |
180 | \r | |
181 | QemuFwCfgReadBytes (sizeof (Result), &Result);\r | |
182 | \r | |
183 | return Result;\r | |
184 | }\r | |
185 | \r | |
186 | \r | |
187 | /**\r | |
188 | Reads a UINT16 firmware configuration value\r | |
189 | \r | |
190 | @return Value of Firmware Configuration item read\r | |
191 | \r | |
192 | **/\r | |
193 | UINT16\r | |
194 | EFIAPI\r | |
195 | QemuFwCfgRead16 (\r | |
196 | VOID\r | |
197 | )\r | |
198 | {\r | |
199 | UINT16 Result;\r | |
200 | \r | |
201 | QemuFwCfgReadBytes (sizeof (Result), &Result);\r | |
202 | \r | |
203 | return Result;\r | |
204 | }\r | |
205 | \r | |
206 | \r | |
207 | /**\r | |
208 | Reads a UINT32 firmware configuration value\r | |
209 | \r | |
210 | @return Value of Firmware Configuration item read\r | |
211 | \r | |
212 | **/\r | |
213 | UINT32\r | |
214 | EFIAPI\r | |
215 | QemuFwCfgRead32 (\r | |
216 | VOID\r | |
217 | )\r | |
218 | {\r | |
219 | UINT32 Result;\r | |
220 | \r | |
221 | QemuFwCfgReadBytes (sizeof (Result), &Result);\r | |
222 | \r | |
223 | return Result;\r | |
224 | }\r | |
225 | \r | |
226 | \r | |
227 | /**\r | |
228 | Reads a UINT64 firmware configuration value\r | |
229 | \r | |
230 | @return Value of Firmware Configuration item read\r | |
231 | \r | |
232 | **/\r | |
233 | UINT64\r | |
234 | EFIAPI\r | |
235 | QemuFwCfgRead64 (\r | |
236 | VOID\r | |
237 | )\r | |
238 | {\r | |
239 | UINT64 Result;\r | |
240 | \r | |
241 | QemuFwCfgReadBytes (sizeof (Result), &Result);\r | |
242 | \r | |
243 | return Result;\r | |
244 | }\r | |
245 | \r | |
246 | \r | |
0ac9bc9b | 247 | /**\r |
248 | Find the configuration item corresponding to the firmware configuration file.\r | |
249 | \r | |
250 | @param[in] Name - Name of file to look up.\r | |
251 | @param[out] Item - Configuration item corresponding to the file, to be passed\r | |
252 | to QemuFwCfgSelectItem ().\r | |
253 | @param[out] Size - Number of bytes in the file.\r | |
254 | \r | |
255 | @return RETURN_SUCCESS If file is found.\r | |
256 | RETURN_NOT_FOUND If file is not found.\r | |
257 | RETURN_UNSUPPORTED If firmware configuration is unavailable.\r | |
258 | \r | |
259 | **/\r | |
260 | RETURN_STATUS\r | |
261 | EFIAPI\r | |
262 | QemuFwCfgFindFile (\r | |
263 | IN CONST CHAR8 *Name,\r | |
264 | OUT FIRMWARE_CONFIG_ITEM *Item,\r | |
265 | OUT UINTN *Size\r | |
266 | )\r | |
267 | {\r | |
268 | UINT32 Count;\r | |
269 | UINT32 Idx;\r | |
270 | \r | |
0dc231c9 | 271 | if (!InternalQemuFwCfgIsAvailable ()) {\r |
0ac9bc9b | 272 | return RETURN_UNSUPPORTED;\r |
273 | }\r | |
274 | \r | |
275 | QemuFwCfgSelectItem (QemuFwCfgItemFileDir);\r | |
276 | Count = SwapBytes32 (QemuFwCfgRead32 ());\r | |
277 | \r | |
278 | for (Idx = 0; Idx < Count; ++Idx) {\r | |
279 | UINT32 FileSize;\r | |
280 | UINT16 FileSelect;\r | |
281 | UINT16 FileReserved;\r | |
6a904296 | 282 | CHAR8 FName[QEMU_FW_CFG_FNAME_SIZE];\r |
0ac9bc9b | 283 | \r |
284 | FileSize = QemuFwCfgRead32 ();\r | |
285 | FileSelect = QemuFwCfgRead16 ();\r | |
286 | FileReserved = QemuFwCfgRead16 ();\r | |
c6910aed | 287 | (VOID) FileReserved; /* Force a do-nothing reference. */\r |
0ac9bc9b | 288 | InternalQemuFwCfgReadBytes (sizeof (FName), FName);\r |
289 | \r | |
290 | if (AsciiStrCmp (Name, FName) == 0) {\r | |
291 | *Item = SwapBytes16 (FileSelect);\r | |
292 | *Size = SwapBytes32 (FileSize);\r | |
293 | return RETURN_SUCCESS;\r | |
294 | }\r | |
295 | }\r | |
296 | \r | |
297 | return RETURN_NOT_FOUND;\r | |
298 | }\r |