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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 | |
45 | IoWrite16 (0x510, (UINT16)(UINTN) QemuFwCfgItem);\r | |
46 | }\r | |
47 | \r | |
48 | \r | |
2c8dcbc6 LE |
49 | /**\r |
50 | Transfer an array of bytes using the DMA interface.\r | |
51 | \r | |
52 | @param[in] Size Size in bytes to transfer.\r | |
53 | @param[in,out] Buffer Buffer to read data into or write data from. May be\r | |
54 | NULL if Size is zero.\r | |
55 | @param[in] Write TRUE if writing to fw_cfg from Buffer, FALSE if\r | |
56 | reading from fw_cfg into Buffer.\r | |
57 | **/\r | |
58 | VOID\r | |
59 | InternalQemuFwCfgDmaBytes (\r | |
60 | IN UINT32 Size,\r | |
61 | IN OUT VOID *Buffer OPTIONAL,\r | |
62 | IN BOOLEAN Write\r | |
63 | )\r | |
64 | {\r | |
65 | volatile FW_CFG_DMA_ACCESS Access;\r | |
66 | UINT32 AccessHigh, AccessLow;\r | |
67 | UINT32 Status;\r | |
68 | \r | |
69 | if (Size == 0) {\r | |
70 | return;\r | |
71 | }\r | |
72 | \r | |
73 | Access.Control = SwapBytes32 (\r | |
74 | Write ? FW_CFG_DMA_CTL_WRITE : FW_CFG_DMA_CTL_READ\r | |
75 | );\r | |
76 | Access.Length = SwapBytes32 (Size);\r | |
77 | Access.Address = SwapBytes64 ((UINTN)Buffer);\r | |
78 | \r | |
79 | //\r | |
80 | // Delimit the transfer from (a) modifications to Access, (b) in case of a\r | |
81 | // write, from writes to Buffer by the caller.\r | |
82 | //\r | |
83 | MemoryFence ();\r | |
84 | \r | |
85 | //\r | |
86 | // Start the transfer.\r | |
87 | //\r | |
88 | AccessHigh = (UINT32)RShiftU64 ((UINTN)&Access, 32);\r | |
89 | AccessLow = (UINT32)(UINTN)&Access;\r | |
90 | IoWrite32 (0x514, SwapBytes32 (AccessHigh));\r | |
91 | IoWrite32 (0x518, SwapBytes32 (AccessLow));\r | |
92 | \r | |
93 | //\r | |
94 | // Don't look at Access.Control before starting the transfer.\r | |
95 | //\r | |
96 | MemoryFence ();\r | |
97 | \r | |
98 | //\r | |
99 | // Wait for the transfer to complete.\r | |
100 | //\r | |
101 | do {\r | |
102 | Status = SwapBytes32 (Access.Control);\r | |
103 | ASSERT ((Status & FW_CFG_DMA_CTL_ERROR) == 0);\r | |
104 | } while (Status != 0);\r | |
105 | \r | |
106 | //\r | |
107 | // After a read, the caller will want to use Buffer.\r | |
108 | //\r | |
109 | MemoryFence ();\r | |
110 | }\r | |
111 | \r | |
112 | \r | |
f1ec65ba | 113 | /**\r |
114 | Reads firmware configuration bytes into a buffer\r | |
115 | \r | |
116 | @param[in] Size - Size in bytes to read\r | |
117 | @param[in] Buffer - Buffer to store data into (OPTIONAL if Size is 0)\r | |
118 | \r | |
119 | **/\r | |
120 | VOID\r | |
121 | EFIAPI\r | |
122 | InternalQemuFwCfgReadBytes (\r | |
123 | IN UINTN Size,\r | |
124 | IN VOID *Buffer OPTIONAL\r | |
125 | )\r | |
126 | {\r | |
2c8dcbc6 LE |
127 | if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {\r |
128 | InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, FALSE);\r | |
129 | return;\r | |
130 | }\r | |
f1ec65ba | 131 | IoReadFifo8 (0x511, Size, Buffer);\r |
132 | }\r | |
133 | \r | |
134 | \r | |
135 | /**\r | |
136 | Reads firmware configuration bytes into a buffer\r | |
137 | \r | |
138 | If called multiple times, then the data read will\r | |
139 | continue at the offset of the firmware configuration\r | |
140 | item where the previous read ended.\r | |
141 | \r | |
142 | @param[in] Size - Size in bytes to read\r | |
143 | @param[in] Buffer - Buffer to store data into\r | |
144 | \r | |
145 | **/\r | |
146 | VOID\r | |
147 | EFIAPI\r | |
148 | QemuFwCfgReadBytes (\r | |
149 | IN UINTN Size,\r | |
150 | IN VOID *Buffer\r | |
151 | )\r | |
152 | {\r | |
0dc231c9 | 153 | if (InternalQemuFwCfgIsAvailable ()) {\r |
f1ec65ba | 154 | InternalQemuFwCfgReadBytes (Size, Buffer);\r |
155 | } else {\r | |
156 | ZeroMem (Buffer, Size);\r | |
157 | }\r | |
158 | }\r | |
159 | \r | |
29874a8c | 160 | /**\r |
161 | Write firmware configuration bytes from a buffer\r | |
162 | \r | |
163 | If called multiple times, then the data written will\r | |
164 | continue at the offset of the firmware configuration\r | |
165 | item where the previous write ended.\r | |
166 | \r | |
167 | @param[in] Size - Size in bytes to write\r | |
168 | @param[in] Buffer - Buffer to read data from\r | |
169 | \r | |
170 | **/\r | |
171 | VOID\r | |
172 | EFIAPI\r | |
173 | QemuFwCfgWriteBytes (\r | |
174 | IN UINTN Size,\r | |
175 | IN VOID *Buffer\r | |
176 | )\r | |
177 | {\r | |
0dc231c9 | 178 | if (InternalQemuFwCfgIsAvailable ()) {\r |
2c8dcbc6 LE |
179 | if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {\r |
180 | InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, TRUE);\r | |
181 | return;\r | |
182 | }\r | |
29874a8c | 183 | IoWriteFifo8 (0x511, Size, Buffer);\r |
184 | }\r | |
185 | }\r | |
186 | \r | |
f1ec65ba | 187 | \r |
188 | /**\r | |
189 | Reads a UINT8 firmware configuration value\r | |
190 | \r | |
191 | @return Value of Firmware Configuration item read\r | |
192 | \r | |
193 | **/\r | |
194 | UINT8\r | |
195 | EFIAPI\r | |
196 | QemuFwCfgRead8 (\r | |
197 | VOID\r | |
198 | )\r | |
199 | {\r | |
200 | UINT8 Result;\r | |
201 | \r | |
202 | QemuFwCfgReadBytes (sizeof (Result), &Result);\r | |
203 | \r | |
204 | return Result;\r | |
205 | }\r | |
206 | \r | |
207 | \r | |
208 | /**\r | |
209 | Reads a UINT16 firmware configuration value\r | |
210 | \r | |
211 | @return Value of Firmware Configuration item read\r | |
212 | \r | |
213 | **/\r | |
214 | UINT16\r | |
215 | EFIAPI\r | |
216 | QemuFwCfgRead16 (\r | |
217 | VOID\r | |
218 | )\r | |
219 | {\r | |
220 | UINT16 Result;\r | |
221 | \r | |
222 | QemuFwCfgReadBytes (sizeof (Result), &Result);\r | |
223 | \r | |
224 | return Result;\r | |
225 | }\r | |
226 | \r | |
227 | \r | |
228 | /**\r | |
229 | Reads a UINT32 firmware configuration value\r | |
230 | \r | |
231 | @return Value of Firmware Configuration item read\r | |
232 | \r | |
233 | **/\r | |
234 | UINT32\r | |
235 | EFIAPI\r | |
236 | QemuFwCfgRead32 (\r | |
237 | VOID\r | |
238 | )\r | |
239 | {\r | |
240 | UINT32 Result;\r | |
241 | \r | |
242 | QemuFwCfgReadBytes (sizeof (Result), &Result);\r | |
243 | \r | |
244 | return Result;\r | |
245 | }\r | |
246 | \r | |
247 | \r | |
248 | /**\r | |
249 | Reads a UINT64 firmware configuration value\r | |
250 | \r | |
251 | @return Value of Firmware Configuration item read\r | |
252 | \r | |
253 | **/\r | |
254 | UINT64\r | |
255 | EFIAPI\r | |
256 | QemuFwCfgRead64 (\r | |
257 | VOID\r | |
258 | )\r | |
259 | {\r | |
260 | UINT64 Result;\r | |
261 | \r | |
262 | QemuFwCfgReadBytes (sizeof (Result), &Result);\r | |
263 | \r | |
264 | return Result;\r | |
265 | }\r | |
266 | \r | |
267 | \r | |
0ac9bc9b | 268 | /**\r |
269 | Find the configuration item corresponding to the firmware configuration file.\r | |
270 | \r | |
271 | @param[in] Name - Name of file to look up.\r | |
272 | @param[out] Item - Configuration item corresponding to the file, to be passed\r | |
273 | to QemuFwCfgSelectItem ().\r | |
274 | @param[out] Size - Number of bytes in the file.\r | |
275 | \r | |
276 | @return RETURN_SUCCESS If file is found.\r | |
277 | RETURN_NOT_FOUND If file is not found.\r | |
278 | RETURN_UNSUPPORTED If firmware configuration is unavailable.\r | |
279 | \r | |
280 | **/\r | |
281 | RETURN_STATUS\r | |
282 | EFIAPI\r | |
283 | QemuFwCfgFindFile (\r | |
284 | IN CONST CHAR8 *Name,\r | |
285 | OUT FIRMWARE_CONFIG_ITEM *Item,\r | |
286 | OUT UINTN *Size\r | |
287 | )\r | |
288 | {\r | |
289 | UINT32 Count;\r | |
290 | UINT32 Idx;\r | |
291 | \r | |
0dc231c9 | 292 | if (!InternalQemuFwCfgIsAvailable ()) {\r |
0ac9bc9b | 293 | return RETURN_UNSUPPORTED;\r |
294 | }\r | |
295 | \r | |
296 | QemuFwCfgSelectItem (QemuFwCfgItemFileDir);\r | |
297 | Count = SwapBytes32 (QemuFwCfgRead32 ());\r | |
298 | \r | |
299 | for (Idx = 0; Idx < Count; ++Idx) {\r | |
300 | UINT32 FileSize;\r | |
301 | UINT16 FileSelect;\r | |
302 | UINT16 FileReserved;\r | |
6a904296 | 303 | CHAR8 FName[QEMU_FW_CFG_FNAME_SIZE];\r |
0ac9bc9b | 304 | \r |
305 | FileSize = QemuFwCfgRead32 ();\r | |
306 | FileSelect = QemuFwCfgRead16 ();\r | |
307 | FileReserved = QemuFwCfgRead16 ();\r | |
c6910aed | 308 | (VOID) FileReserved; /* Force a do-nothing reference. */\r |
0ac9bc9b | 309 | InternalQemuFwCfgReadBytes (sizeof (FName), FName);\r |
310 | \r | |
311 | if (AsciiStrCmp (Name, FName) == 0) {\r | |
312 | *Item = SwapBytes16 (FileSelect);\r | |
313 | *Size = SwapBytes32 (FileSize);\r | |
314 | return RETURN_SUCCESS;\r | |
315 | }\r | |
316 | }\r | |
317 | \r | |
318 | return RETURN_NOT_FOUND;\r | |
319 | }\r | |
14eb7a5b LE |
320 | \r |
321 | \r | |
322 | /**\r | |
323 | Determine if S3 support is explicitly enabled.\r | |
324 | \r | |
325 | @retval TRUE if S3 support is explicitly enabled.\r | |
326 | FALSE otherwise. This includes unavailability of the firmware\r | |
327 | configuration interface.\r | |
328 | **/\r | |
329 | BOOLEAN\r | |
330 | EFIAPI\r | |
331 | QemuFwCfgS3Enabled (\r | |
332 | VOID\r | |
333 | )\r | |
334 | {\r | |
335 | RETURN_STATUS Status;\r | |
336 | FIRMWARE_CONFIG_ITEM FwCfgItem;\r | |
337 | UINTN FwCfgSize;\r | |
338 | UINT8 SystemStates[6];\r | |
339 | \r | |
340 | Status = QemuFwCfgFindFile ("etc/system-states", &FwCfgItem, &FwCfgSize);\r | |
341 | if (Status != RETURN_SUCCESS || FwCfgSize != sizeof SystemStates) {\r | |
342 | return FALSE;\r | |
343 | }\r | |
344 | QemuFwCfgSelectItem (FwCfgItem);\r | |
345 | QemuFwCfgReadBytes (sizeof SystemStates, SystemStates);\r | |
346 | return (BOOLEAN) (SystemStates[3] & BIT7);\r | |
347 | }\r |