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1 | /** @file\r | |
2 | \r | |
3 | Stateful and implicitly initialized fw_cfg library implementation.\r | |
4 | \r | |
5 | Copyright (C) 2013 - 2014, Red Hat, Inc.\r | |
6 | Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>\r | |
7 | (C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>\r | |
8 | \r | |
9 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
10 | **/\r | |
11 | \r | |
12 | #include <Uefi.h>\r | |
13 | \r | |
14 | #include <Library/BaseLib.h>\r | |
15 | #include <Library/BaseMemoryLib.h>\r | |
16 | #include <Library/DebugLib.h>\r | |
17 | #include <Library/IoLib.h>\r | |
18 | #include <Library/QemuFwCfgLib.h>\r | |
19 | #include <Library/UefiBootServicesTableLib.h>\r | |
20 | \r | |
21 | #include <Protocol/FdtClient.h>\r | |
22 | \r | |
23 | STATIC UINTN mFwCfgSelectorAddress;\r | |
24 | STATIC UINTN mFwCfgDataAddress;\r | |
25 | STATIC UINTN mFwCfgDmaAddress;\r | |
26 | \r | |
27 | /**\r | |
28 | Reads firmware configuration bytes into a buffer\r | |
29 | \r | |
30 | @param[in] Size Size in bytes to read\r | |
31 | @param[in] Buffer Buffer to store data into (OPTIONAL if Size is 0)\r | |
32 | \r | |
33 | **/\r | |
34 | typedef\r | |
35 | VOID(EFIAPI READ_BYTES_FUNCTION)(\r | |
36 | IN UINTN Size,\r | |
37 | IN VOID *Buffer OPTIONAL\r | |
38 | );\r | |
39 | \r | |
40 | /**\r | |
41 | Writes bytes from a buffer to firmware configuration\r | |
42 | \r | |
43 | @param[in] Size Size in bytes to write\r | |
44 | @param[in] Buffer Buffer to transfer data from (OPTIONAL if Size is 0)\r | |
45 | \r | |
46 | **/\r | |
47 | typedef\r | |
48 | VOID(EFIAPI WRITE_BYTES_FUNCTION)(\r | |
49 | IN UINTN Size,\r | |
50 | IN VOID *Buffer OPTIONAL\r | |
51 | );\r | |
52 | \r | |
53 | /**\r | |
54 | Skips bytes in firmware configuration\r | |
55 | \r | |
56 | @param[in] Size Size in bytes to skip\r | |
57 | \r | |
58 | **/\r | |
59 | typedef\r | |
60 | VOID(EFIAPI SKIP_BYTES_FUNCTION)(\r | |
61 | IN UINTN Size\r | |
62 | );\r | |
63 | \r | |
64 | //\r | |
65 | // Forward declaration of the two implementations we have.\r | |
66 | //\r | |
67 | STATIC READ_BYTES_FUNCTION MmioReadBytes;\r | |
68 | STATIC WRITE_BYTES_FUNCTION MmioWriteBytes;\r | |
69 | STATIC SKIP_BYTES_FUNCTION MmioSkipBytes;\r | |
70 | STATIC READ_BYTES_FUNCTION DmaReadBytes;\r | |
71 | STATIC WRITE_BYTES_FUNCTION DmaWriteBytes;\r | |
72 | STATIC SKIP_BYTES_FUNCTION DmaSkipBytes;\r | |
73 | \r | |
74 | //\r | |
75 | // These correspond to the implementation we detect at runtime.\r | |
76 | //\r | |
77 | STATIC READ_BYTES_FUNCTION *InternalQemuFwCfgReadBytes = MmioReadBytes;\r | |
78 | STATIC WRITE_BYTES_FUNCTION *InternalQemuFwCfgWriteBytes = MmioWriteBytes;\r | |
79 | STATIC SKIP_BYTES_FUNCTION *InternalQemuFwCfgSkipBytes = MmioSkipBytes;\r | |
80 | \r | |
81 | /**\r | |
82 | Returns a boolean indicating if the firmware configuration interface\r | |
83 | is available or not.\r | |
84 | \r | |
85 | This function may change fw_cfg state.\r | |
86 | \r | |
87 | @retval TRUE The interface is available\r | |
88 | @retval FALSE The interface is not available\r | |
89 | \r | |
90 | **/\r | |
91 | BOOLEAN\r | |
92 | EFIAPI\r | |
93 | QemuFwCfgIsAvailable (\r | |
94 | VOID\r | |
95 | )\r | |
96 | {\r | |
97 | return (BOOLEAN)(mFwCfgSelectorAddress != 0 && mFwCfgDataAddress != 0);\r | |
98 | }\r | |
99 | \r | |
100 | RETURN_STATUS\r | |
101 | EFIAPI\r | |
102 | QemuFwCfgInitialize (\r | |
103 | VOID\r | |
104 | )\r | |
105 | {\r | |
106 | EFI_STATUS Status;\r | |
107 | FDT_CLIENT_PROTOCOL *FdtClient;\r | |
108 | CONST UINT64 *Reg;\r | |
109 | UINT32 RegSize;\r | |
110 | UINTN AddressCells, SizeCells;\r | |
111 | UINT64 FwCfgSelectorAddress;\r | |
112 | UINT64 FwCfgSelectorSize;\r | |
113 | UINT64 FwCfgDataAddress;\r | |
114 | UINT64 FwCfgDataSize;\r | |
115 | UINT64 FwCfgDmaAddress;\r | |
116 | UINT64 FwCfgDmaSize;\r | |
117 | \r | |
118 | Status = gBS->LocateProtocol (\r | |
119 | &gFdtClientProtocolGuid,\r | |
120 | NULL,\r | |
121 | (VOID **)&FdtClient\r | |
122 | );\r | |
123 | ASSERT_EFI_ERROR (Status);\r | |
124 | \r | |
125 | Status = FdtClient->FindCompatibleNodeReg (\r | |
126 | FdtClient,\r | |
127 | "qemu,fw-cfg-mmio",\r | |
128 | (CONST VOID **)&Reg,\r | |
129 | &AddressCells,\r | |
130 | &SizeCells,\r | |
131 | &RegSize\r | |
132 | );\r | |
133 | if (EFI_ERROR (Status)) {\r | |
134 | DEBUG ((\r | |
135 | DEBUG_WARN,\r | |
136 | "%a: No 'qemu,fw-cfg-mmio' compatible DT node found (Status == %r)\n",\r | |
137 | __FUNCTION__,\r | |
138 | Status\r | |
139 | ));\r | |
140 | return EFI_SUCCESS;\r | |
141 | }\r | |
142 | \r | |
143 | ASSERT (AddressCells == 2);\r | |
144 | ASSERT (SizeCells == 2);\r | |
145 | ASSERT (RegSize == 2 * sizeof (UINT64));\r | |
146 | \r | |
147 | FwCfgDataAddress = SwapBytes64 (Reg[0]);\r | |
148 | FwCfgDataSize = 8;\r | |
149 | FwCfgSelectorAddress = FwCfgDataAddress + FwCfgDataSize;\r | |
150 | FwCfgSelectorSize = 2;\r | |
151 | \r | |
152 | //\r | |
153 | // The following ASSERT()s express\r | |
154 | //\r | |
155 | // Address + Size - 1 <= MAX_UINTN\r | |
156 | //\r | |
157 | // for both registers, that is, that the last byte in each MMIO range is\r | |
158 | // expressible as a MAX_UINTN. The form below is mathematically\r | |
159 | // equivalent, and it also prevents any unsigned overflow before the\r | |
160 | // comparison.\r | |
161 | //\r | |
162 | ASSERT (FwCfgSelectorAddress <= MAX_UINTN - FwCfgSelectorSize + 1);\r | |
163 | ASSERT (FwCfgDataAddress <= MAX_UINTN - FwCfgDataSize + 1);\r | |
164 | \r | |
165 | mFwCfgSelectorAddress = FwCfgSelectorAddress;\r | |
166 | mFwCfgDataAddress = FwCfgDataAddress;\r | |
167 | \r | |
168 | DEBUG ((\r | |
169 | DEBUG_INFO,\r | |
170 | "Found FwCfg @ 0x%Lx/0x%Lx\n",\r | |
171 | FwCfgSelectorAddress,\r | |
172 | FwCfgDataAddress\r | |
173 | ));\r | |
174 | \r | |
175 | if (SwapBytes64 (Reg[1]) >= 0x18) {\r | |
176 | FwCfgDmaAddress = FwCfgDataAddress + 0x10;\r | |
177 | FwCfgDmaSize = 0x08;\r | |
178 | \r | |
179 | //\r | |
180 | // See explanation above.\r | |
181 | //\r | |
182 | ASSERT (FwCfgDmaAddress <= MAX_UINTN - FwCfgDmaSize + 1);\r | |
183 | \r | |
184 | DEBUG ((DEBUG_INFO, "Found FwCfg DMA @ 0x%Lx\n", FwCfgDmaAddress));\r | |
185 | } else {\r | |
186 | FwCfgDmaAddress = 0;\r | |
187 | }\r | |
188 | \r | |
189 | if (QemuFwCfgIsAvailable ()) {\r | |
190 | UINT32 Signature;\r | |
191 | \r | |
192 | QemuFwCfgSelectItem (QemuFwCfgItemSignature);\r | |
193 | Signature = QemuFwCfgRead32 ();\r | |
194 | if (Signature == SIGNATURE_32 ('Q', 'E', 'M', 'U')) {\r | |
195 | //\r | |
196 | // For DMA support, we require the DTB to advertise the register, and the\r | |
197 | // feature bitmap (which we read without DMA) to confirm the feature.\r | |
198 | //\r | |
199 | if (FwCfgDmaAddress != 0) {\r | |
200 | UINT32 Features;\r | |
201 | \r | |
202 | QemuFwCfgSelectItem (QemuFwCfgItemInterfaceVersion);\r | |
203 | Features = QemuFwCfgRead32 ();\r | |
204 | if ((Features & FW_CFG_F_DMA) != 0) {\r | |
205 | mFwCfgDmaAddress = FwCfgDmaAddress;\r | |
206 | InternalQemuFwCfgReadBytes = DmaReadBytes;\r | |
207 | InternalQemuFwCfgWriteBytes = DmaWriteBytes;\r | |
208 | InternalQemuFwCfgSkipBytes = DmaSkipBytes;\r | |
209 | }\r | |
210 | }\r | |
211 | } else {\r | |
212 | mFwCfgSelectorAddress = 0;\r | |
213 | mFwCfgDataAddress = 0;\r | |
214 | }\r | |
215 | }\r | |
216 | \r | |
217 | return RETURN_SUCCESS;\r | |
218 | }\r | |
219 | \r | |
220 | /**\r | |
221 | Selects a firmware configuration item for reading.\r | |
222 | \r | |
223 | Following this call, any data read from this item will start from the\r | |
224 | beginning of the configuration item's data.\r | |
225 | \r | |
226 | @param[in] QemuFwCfgItem Firmware Configuration item to read\r | |
227 | \r | |
228 | **/\r | |
229 | VOID\r | |
230 | EFIAPI\r | |
231 | QemuFwCfgSelectItem (\r | |
232 | IN FIRMWARE_CONFIG_ITEM QemuFwCfgItem\r | |
233 | )\r | |
234 | {\r | |
235 | if (QemuFwCfgIsAvailable ()) {\r | |
236 | MmioWrite16 (mFwCfgSelectorAddress, SwapBytes16 ((UINT16)QemuFwCfgItem));\r | |
237 | }\r | |
238 | }\r | |
239 | \r | |
240 | /**\r | |
241 | Slow READ_BYTES_FUNCTION.\r | |
242 | **/\r | |
243 | STATIC\r | |
244 | VOID\r | |
245 | EFIAPI\r | |
246 | MmioReadBytes (\r | |
247 | IN UINTN Size,\r | |
248 | IN VOID *Buffer OPTIONAL\r | |
249 | )\r | |
250 | {\r | |
251 | UINTN Left;\r | |
252 | UINT8 *Ptr;\r | |
253 | UINT8 *End;\r | |
254 | \r | |
255 | #if defined (MDE_CPU_AARCH64) || defined (MDE_CPU_RISCV64)\r | |
256 | Left = Size & 7;\r | |
257 | #else\r | |
258 | Left = Size & 3;\r | |
259 | #endif\r | |
260 | \r | |
261 | Size -= Left;\r | |
262 | Ptr = Buffer;\r | |
263 | End = Ptr + Size;\r | |
264 | \r | |
265 | #if defined (MDE_CPU_AARCH64) || defined (MDE_CPU_RISCV64)\r | |
266 | while (Ptr < End) {\r | |
267 | *(UINT64 *)Ptr = MmioRead64 (mFwCfgDataAddress);\r | |
268 | Ptr += 8;\r | |
269 | }\r | |
270 | \r | |
271 | if (Left & 4) {\r | |
272 | *(UINT32 *)Ptr = MmioRead32 (mFwCfgDataAddress);\r | |
273 | Ptr += 4;\r | |
274 | }\r | |
275 | \r | |
276 | #else\r | |
277 | while (Ptr < End) {\r | |
278 | *(UINT32 *)Ptr = MmioRead32 (mFwCfgDataAddress);\r | |
279 | Ptr += 4;\r | |
280 | }\r | |
281 | \r | |
282 | #endif\r | |
283 | \r | |
284 | if (Left & 2) {\r | |
285 | *(UINT16 *)Ptr = MmioRead16 (mFwCfgDataAddress);\r | |
286 | Ptr += 2;\r | |
287 | }\r | |
288 | \r | |
289 | if (Left & 1) {\r | |
290 | *Ptr = MmioRead8 (mFwCfgDataAddress);\r | |
291 | }\r | |
292 | }\r | |
293 | \r | |
294 | /**\r | |
295 | Transfer an array of bytes, or skip a number of bytes, using the DMA\r | |
296 | interface.\r | |
297 | \r | |
298 | @param[in] Size Size in bytes to transfer or skip.\r | |
299 | \r | |
300 | @param[in,out] Buffer Buffer to read data into or write data from. Ignored,\r | |
301 | and may be NULL, if Size is zero, or Control is\r | |
302 | FW_CFG_DMA_CTL_SKIP.\r | |
303 | \r | |
304 | @param[in] Control One of the following:\r | |
305 | FW_CFG_DMA_CTL_WRITE - write to fw_cfg from Buffer.\r | |
306 | FW_CFG_DMA_CTL_READ - read from fw_cfg into Buffer.\r | |
307 | FW_CFG_DMA_CTL_SKIP - skip bytes in fw_cfg.\r | |
308 | **/\r | |
309 | STATIC\r | |
310 | VOID\r | |
311 | DmaTransferBytes (\r | |
312 | IN UINTN Size,\r | |
313 | IN OUT VOID *Buffer OPTIONAL,\r | |
314 | IN UINT32 Control\r | |
315 | )\r | |
316 | {\r | |
317 | volatile FW_CFG_DMA_ACCESS Access;\r | |
318 | UINT32 Status;\r | |
319 | \r | |
320 | ASSERT (\r | |
321 | Control == FW_CFG_DMA_CTL_WRITE || Control == FW_CFG_DMA_CTL_READ ||\r | |
322 | Control == FW_CFG_DMA_CTL_SKIP\r | |
323 | );\r | |
324 | \r | |
325 | if (Size == 0) {\r | |
326 | return;\r | |
327 | }\r | |
328 | \r | |
329 | ASSERT (Size <= MAX_UINT32);\r | |
330 | \r | |
331 | Access.Control = SwapBytes32 (Control);\r | |
332 | Access.Length = SwapBytes32 ((UINT32)Size);\r | |
333 | Access.Address = SwapBytes64 ((UINT64)(UINTN)Buffer);\r | |
334 | \r | |
335 | //\r | |
336 | // We shouldn't start the transfer before setting up Access.\r | |
337 | //\r | |
338 | MemoryFence ();\r | |
339 | \r | |
340 | //\r | |
341 | // This will fire off the transfer.\r | |
342 | //\r | |
343 | #if defined (MDE_CPU_AARCH64) || defined (MDE_CPU_RISCV64)\r | |
344 | MmioWrite64 (mFwCfgDmaAddress, SwapBytes64 ((UINT64)&Access));\r | |
345 | #else\r | |
346 | MmioWrite32 ((UINT32)(mFwCfgDmaAddress + 4), SwapBytes32 ((UINT32)&Access));\r | |
347 | #endif\r | |
348 | \r | |
349 | //\r | |
350 | // We shouldn't look at Access.Control before starting the transfer.\r | |
351 | //\r | |
352 | MemoryFence ();\r | |
353 | \r | |
354 | do {\r | |
355 | Status = SwapBytes32 (Access.Control);\r | |
356 | ASSERT ((Status & FW_CFG_DMA_CTL_ERROR) == 0);\r | |
357 | } while (Status != 0);\r | |
358 | \r | |
359 | //\r | |
360 | // The caller will want to access the transferred data.\r | |
361 | //\r | |
362 | MemoryFence ();\r | |
363 | }\r | |
364 | \r | |
365 | /**\r | |
366 | Fast READ_BYTES_FUNCTION.\r | |
367 | **/\r | |
368 | STATIC\r | |
369 | VOID\r | |
370 | EFIAPI\r | |
371 | DmaReadBytes (\r | |
372 | IN UINTN Size,\r | |
373 | IN VOID *Buffer OPTIONAL\r | |
374 | )\r | |
375 | {\r | |
376 | DmaTransferBytes (Size, Buffer, FW_CFG_DMA_CTL_READ);\r | |
377 | }\r | |
378 | \r | |
379 | /**\r | |
380 | Reads firmware configuration bytes into a buffer\r | |
381 | \r | |
382 | If called multiple times, then the data read will continue at the offset of\r | |
383 | the firmware configuration item where the previous read ended.\r | |
384 | \r | |
385 | @param[in] Size Size in bytes to read\r | |
386 | @param[in] Buffer Buffer to store data into\r | |
387 | \r | |
388 | **/\r | |
389 | VOID\r | |
390 | EFIAPI\r | |
391 | QemuFwCfgReadBytes (\r | |
392 | IN UINTN Size,\r | |
393 | IN VOID *Buffer\r | |
394 | )\r | |
395 | {\r | |
396 | if (QemuFwCfgIsAvailable ()) {\r | |
397 | InternalQemuFwCfgReadBytes (Size, Buffer);\r | |
398 | } else {\r | |
399 | ZeroMem (Buffer, Size);\r | |
400 | }\r | |
401 | }\r | |
402 | \r | |
403 | /**\r | |
404 | Slow WRITE_BYTES_FUNCTION.\r | |
405 | **/\r | |
406 | STATIC\r | |
407 | VOID\r | |
408 | EFIAPI\r | |
409 | MmioWriteBytes (\r | |
410 | IN UINTN Size,\r | |
411 | IN VOID *Buffer OPTIONAL\r | |
412 | )\r | |
413 | {\r | |
414 | UINTN Idx;\r | |
415 | \r | |
416 | for (Idx = 0; Idx < Size; ++Idx) {\r | |
417 | MmioWrite8 (mFwCfgDataAddress, ((UINT8 *)Buffer)[Idx]);\r | |
418 | }\r | |
419 | }\r | |
420 | \r | |
421 | /**\r | |
422 | Fast WRITE_BYTES_FUNCTION.\r | |
423 | **/\r | |
424 | STATIC\r | |
425 | VOID\r | |
426 | EFIAPI\r | |
427 | DmaWriteBytes (\r | |
428 | IN UINTN Size,\r | |
429 | IN VOID *Buffer OPTIONAL\r | |
430 | )\r | |
431 | {\r | |
432 | DmaTransferBytes (Size, Buffer, FW_CFG_DMA_CTL_WRITE);\r | |
433 | }\r | |
434 | \r | |
435 | /**\r | |
436 | Write firmware configuration bytes from a buffer\r | |
437 | \r | |
438 | If called multiple times, then the data written will continue at the offset\r | |
439 | of the firmware configuration item where the previous write ended.\r | |
440 | \r | |
441 | @param[in] Size Size in bytes to write\r | |
442 | @param[in] Buffer Buffer to read data from\r | |
443 | \r | |
444 | **/\r | |
445 | VOID\r | |
446 | EFIAPI\r | |
447 | QemuFwCfgWriteBytes (\r | |
448 | IN UINTN Size,\r | |
449 | IN VOID *Buffer\r | |
450 | )\r | |
451 | {\r | |
452 | if (QemuFwCfgIsAvailable ()) {\r | |
453 | InternalQemuFwCfgWriteBytes (Size, Buffer);\r | |
454 | }\r | |
455 | }\r | |
456 | \r | |
457 | /**\r | |
458 | Slow SKIP_BYTES_FUNCTION.\r | |
459 | **/\r | |
460 | STATIC\r | |
461 | VOID\r | |
462 | EFIAPI\r | |
463 | MmioSkipBytes (\r | |
464 | IN UINTN Size\r | |
465 | )\r | |
466 | {\r | |
467 | UINTN ChunkSize;\r | |
468 | UINT8 SkipBuffer[256];\r | |
469 | \r | |
470 | //\r | |
471 | // Emulate the skip by reading data in chunks, and throwing it away. The\r | |
472 | // implementation below doesn't affect the static data footprint for client\r | |
473 | // modules. Large skips are not expected, therefore this fallback is not\r | |
474 | // performance critical. The size of SkipBuffer is thought not to exert a\r | |
475 | // large pressure on the stack.\r | |
476 | //\r | |
477 | while (Size > 0) {\r | |
478 | ChunkSize = MIN (Size, sizeof SkipBuffer);\r | |
479 | MmioReadBytes (ChunkSize, SkipBuffer);\r | |
480 | Size -= ChunkSize;\r | |
481 | }\r | |
482 | }\r | |
483 | \r | |
484 | /**\r | |
485 | Fast SKIP_BYTES_FUNCTION.\r | |
486 | **/\r | |
487 | STATIC\r | |
488 | VOID\r | |
489 | EFIAPI\r | |
490 | DmaSkipBytes (\r | |
491 | IN UINTN Size\r | |
492 | )\r | |
493 | {\r | |
494 | DmaTransferBytes (Size, NULL, FW_CFG_DMA_CTL_SKIP);\r | |
495 | }\r | |
496 | \r | |
497 | /**\r | |
498 | Skip bytes in the firmware configuration item.\r | |
499 | \r | |
500 | Increase the offset of the firmware configuration item without transferring\r | |
501 | bytes between the item and a caller-provided buffer. Subsequent read, write\r | |
502 | or skip operations will commence at the increased offset.\r | |
503 | \r | |
504 | @param[in] Size Number of bytes to skip.\r | |
505 | **/\r | |
506 | VOID\r | |
507 | EFIAPI\r | |
508 | QemuFwCfgSkipBytes (\r | |
509 | IN UINTN Size\r | |
510 | )\r | |
511 | {\r | |
512 | if (QemuFwCfgIsAvailable ()) {\r | |
513 | InternalQemuFwCfgSkipBytes (Size);\r | |
514 | }\r | |
515 | }\r | |
516 | \r | |
517 | /**\r | |
518 | Reads a UINT8 firmware configuration value\r | |
519 | \r | |
520 | @return Value of Firmware Configuration item read\r | |
521 | \r | |
522 | **/\r | |
523 | UINT8\r | |
524 | EFIAPI\r | |
525 | QemuFwCfgRead8 (\r | |
526 | VOID\r | |
527 | )\r | |
528 | {\r | |
529 | UINT8 Result;\r | |
530 | \r | |
531 | QemuFwCfgReadBytes (sizeof Result, &Result);\r | |
532 | return Result;\r | |
533 | }\r | |
534 | \r | |
535 | /**\r | |
536 | Reads a UINT16 firmware configuration value\r | |
537 | \r | |
538 | @return Value of Firmware Configuration item read\r | |
539 | \r | |
540 | **/\r | |
541 | UINT16\r | |
542 | EFIAPI\r | |
543 | QemuFwCfgRead16 (\r | |
544 | VOID\r | |
545 | )\r | |
546 | {\r | |
547 | UINT16 Result;\r | |
548 | \r | |
549 | QemuFwCfgReadBytes (sizeof Result, &Result);\r | |
550 | return Result;\r | |
551 | }\r | |
552 | \r | |
553 | /**\r | |
554 | Reads a UINT32 firmware configuration value\r | |
555 | \r | |
556 | @return Value of Firmware Configuration item read\r | |
557 | \r | |
558 | **/\r | |
559 | UINT32\r | |
560 | EFIAPI\r | |
561 | QemuFwCfgRead32 (\r | |
562 | VOID\r | |
563 | )\r | |
564 | {\r | |
565 | UINT32 Result;\r | |
566 | \r | |
567 | QemuFwCfgReadBytes (sizeof Result, &Result);\r | |
568 | return Result;\r | |
569 | }\r | |
570 | \r | |
571 | /**\r | |
572 | Reads a UINT64 firmware configuration value\r | |
573 | \r | |
574 | @return Value of Firmware Configuration item read\r | |
575 | \r | |
576 | **/\r | |
577 | UINT64\r | |
578 | EFIAPI\r | |
579 | QemuFwCfgRead64 (\r | |
580 | VOID\r | |
581 | )\r | |
582 | {\r | |
583 | UINT64 Result;\r | |
584 | \r | |
585 | QemuFwCfgReadBytes (sizeof Result, &Result);\r | |
586 | return Result;\r | |
587 | }\r | |
588 | \r | |
589 | /**\r | |
590 | Find the configuration item corresponding to the firmware configuration file.\r | |
591 | \r | |
592 | @param[in] Name Name of file to look up.\r | |
593 | @param[out] Item Configuration item corresponding to the file, to be passed\r | |
594 | to QemuFwCfgSelectItem ().\r | |
595 | @param[out] Size Number of bytes in the file.\r | |
596 | \r | |
597 | @retval RETURN_SUCCESS If file is found.\r | |
598 | @retval RETURN_NOT_FOUND If file is not found.\r | |
599 | @retval RETURN_UNSUPPORTED If firmware configuration is unavailable.\r | |
600 | \r | |
601 | **/\r | |
602 | RETURN_STATUS\r | |
603 | EFIAPI\r | |
604 | QemuFwCfgFindFile (\r | |
605 | IN CONST CHAR8 *Name,\r | |
606 | OUT FIRMWARE_CONFIG_ITEM *Item,\r | |
607 | OUT UINTN *Size\r | |
608 | )\r | |
609 | {\r | |
610 | UINT32 Count;\r | |
611 | UINT32 Idx;\r | |
612 | \r | |
613 | if (!QemuFwCfgIsAvailable ()) {\r | |
614 | return RETURN_UNSUPPORTED;\r | |
615 | }\r | |
616 | \r | |
617 | QemuFwCfgSelectItem (QemuFwCfgItemFileDir);\r | |
618 | Count = SwapBytes32 (QemuFwCfgRead32 ());\r | |
619 | \r | |
620 | for (Idx = 0; Idx < Count; ++Idx) {\r | |
621 | UINT32 FileSize;\r | |
622 | UINT16 FileSelect;\r | |
623 | CHAR8 FName[QEMU_FW_CFG_FNAME_SIZE];\r | |
624 | \r | |
625 | FileSize = QemuFwCfgRead32 ();\r | |
626 | FileSelect = QemuFwCfgRead16 ();\r | |
627 | QemuFwCfgRead16 (); // skip the field called "reserved"\r | |
628 | InternalQemuFwCfgReadBytes (sizeof (FName), FName);\r | |
629 | \r | |
630 | if (AsciiStrCmp (Name, FName) == 0) {\r | |
631 | *Item = (FIRMWARE_CONFIG_ITEM)SwapBytes16 (FileSelect);\r | |
632 | *Size = SwapBytes32 (FileSize);\r | |
633 | return RETURN_SUCCESS;\r | |
634 | }\r | |
635 | }\r | |
636 | \r | |
637 | return RETURN_NOT_FOUND;\r | |
638 | }\r |