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263559b8 | 1 | /** @file\r |
2 | \r | |
3 | Utility functions used by virtio device drivers.\r | |
4 | \r | |
8bc951a2 | 5 | Copyright (C) 2012-2016, Red Hat, Inc.\r |
56f65ed8 | 6 | Portion of Copyright (C) 2013, ARM Ltd.\r |
0a78d754 | 7 | Copyright (C) 2017, AMD Inc, All rights reserved.<BR>\r |
263559b8 | 8 | \r |
9 | This program and the accompanying materials are licensed and made available\r | |
10 | under the terms and conditions of the BSD License which accompanies this\r | |
11 | distribution. The full text of the license may be found at\r | |
12 | http://opensource.org/licenses/bsd-license.php\r | |
13 | \r | |
14 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r | |
15 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
16 | \r | |
17 | **/\r | |
18 | \r | |
e371e7e5 | 19 | #include <Library/BaseLib.h>\r |
263559b8 | 20 | #include <Library/BaseMemoryLib.h>\r |
21 | #include <Library/DebugLib.h>\r | |
22 | #include <Library/MemoryAllocationLib.h>\r | |
e371e7e5 | 23 | #include <Library/UefiBootServicesTableLib.h>\r |
263559b8 | 24 | \r |
25 | #include <Library/VirtioLib.h>\r | |
26 | \r | |
27 | \r | |
263559b8 | 28 | /**\r |
29 | \r | |
30 | Configure a virtio ring.\r | |
31 | \r | |
32 | This function sets up internal storage (the guest-host communication area)\r | |
33 | and lays out several "navigation" (ie. no-ownership) pointers to parts of\r | |
34 | that storage.\r | |
35 | \r | |
36 | Relevant sections from the virtio-0.9.5 spec:\r | |
37 | - 1.1 Virtqueues,\r | |
38 | - 2.3 Virtqueue Configuration.\r | |
39 | \r | |
40 | @param[in] The number of descriptors to allocate for the\r | |
41 | virtio ring, as requested by the host.\r | |
42 | \r | |
43 | @param[out] Ring The virtio ring to set up.\r | |
44 | \r | |
45 | @retval EFI_OUT_OF_RESOURCES AllocatePages() failed to allocate contiguous\r | |
46 | pages for the requested QueueSize. Fields of\r | |
47 | Ring have indeterminate value.\r | |
48 | \r | |
49 | @retval EFI_SUCCESS Allocation and setup successful. Ring->Base\r | |
50 | (and nothing else) is responsible for\r | |
51 | deallocation.\r | |
52 | \r | |
53 | **/\r | |
54 | EFI_STATUS\r | |
55 | EFIAPI\r | |
56 | VirtioRingInit (\r | |
57 | IN UINT16 QueueSize,\r | |
58 | OUT VRING *Ring\r | |
59 | )\r | |
60 | {\r | |
61 | UINTN RingSize;\r | |
62 | volatile UINT8 *RingPagesPtr;\r | |
63 | \r | |
64 | RingSize = ALIGN_VALUE (\r | |
65 | sizeof *Ring->Desc * QueueSize +\r | |
66 | sizeof *Ring->Avail.Flags +\r | |
67 | sizeof *Ring->Avail.Idx +\r | |
68 | sizeof *Ring->Avail.Ring * QueueSize +\r | |
69 | sizeof *Ring->Avail.UsedEvent,\r | |
70 | EFI_PAGE_SIZE);\r | |
71 | \r | |
72 | RingSize += ALIGN_VALUE (\r | |
73 | sizeof *Ring->Used.Flags +\r | |
74 | sizeof *Ring->Used.Idx +\r | |
75 | sizeof *Ring->Used.UsedElem * QueueSize +\r | |
76 | sizeof *Ring->Used.AvailEvent,\r | |
77 | EFI_PAGE_SIZE);\r | |
78 | \r | |
79 | Ring->NumPages = EFI_SIZE_TO_PAGES (RingSize);\r | |
80 | Ring->Base = AllocatePages (Ring->NumPages);\r | |
81 | if (Ring->Base == NULL) {\r | |
82 | return EFI_OUT_OF_RESOURCES;\r | |
83 | }\r | |
84 | SetMem (Ring->Base, RingSize, 0x00);\r | |
85 | RingPagesPtr = Ring->Base;\r | |
86 | \r | |
87 | Ring->Desc = (volatile VOID *) RingPagesPtr;\r | |
88 | RingPagesPtr += sizeof *Ring->Desc * QueueSize;\r | |
89 | \r | |
90 | Ring->Avail.Flags = (volatile VOID *) RingPagesPtr;\r | |
91 | RingPagesPtr += sizeof *Ring->Avail.Flags;\r | |
92 | \r | |
93 | Ring->Avail.Idx = (volatile VOID *) RingPagesPtr;\r | |
94 | RingPagesPtr += sizeof *Ring->Avail.Idx;\r | |
95 | \r | |
96 | Ring->Avail.Ring = (volatile VOID *) RingPagesPtr;\r | |
97 | RingPagesPtr += sizeof *Ring->Avail.Ring * QueueSize;\r | |
98 | \r | |
99 | Ring->Avail.UsedEvent = (volatile VOID *) RingPagesPtr;\r | |
100 | RingPagesPtr += sizeof *Ring->Avail.UsedEvent;\r | |
101 | \r | |
102 | RingPagesPtr = (volatile UINT8 *) Ring->Base +\r | |
103 | ALIGN_VALUE (RingPagesPtr - (volatile UINT8 *) Ring->Base,\r | |
104 | EFI_PAGE_SIZE);\r | |
105 | \r | |
106 | Ring->Used.Flags = (volatile VOID *) RingPagesPtr;\r | |
107 | RingPagesPtr += sizeof *Ring->Used.Flags;\r | |
108 | \r | |
109 | Ring->Used.Idx = (volatile VOID *) RingPagesPtr;\r | |
110 | RingPagesPtr += sizeof *Ring->Used.Idx;\r | |
111 | \r | |
112 | Ring->Used.UsedElem = (volatile VOID *) RingPagesPtr;\r | |
113 | RingPagesPtr += sizeof *Ring->Used.UsedElem * QueueSize;\r | |
114 | \r | |
115 | Ring->Used.AvailEvent = (volatile VOID *) RingPagesPtr;\r | |
116 | RingPagesPtr += sizeof *Ring->Used.AvailEvent;\r | |
117 | \r | |
118 | Ring->QueueSize = QueueSize;\r | |
119 | return EFI_SUCCESS;\r | |
120 | }\r | |
121 | \r | |
122 | \r | |
123 | /**\r | |
124 | \r | |
125 | Tear down the internal resources of a configured virtio ring.\r | |
126 | \r | |
127 | The caller is responsible to stop the host from using this ring before\r | |
128 | invoking this function: the VSTAT_DRIVER_OK bit must be clear in\r | |
129 | VhdrDeviceStatus.\r | |
130 | \r | |
131 | @param[out] Ring The virtio ring to clean up.\r | |
132 | \r | |
133 | **/\r | |
134 | VOID\r | |
135 | EFIAPI\r | |
136 | VirtioRingUninit (\r | |
137 | IN OUT VRING *Ring\r | |
138 | )\r | |
139 | {\r | |
140 | FreePages (Ring->Base, Ring->NumPages);\r | |
141 | SetMem (Ring, sizeof *Ring, 0x00);\r | |
142 | }\r | |
143 | \r | |
144 | \r | |
e371e7e5 | 145 | /**\r |
146 | \r | |
147 | Turn off interrupt notifications from the host, and prepare for appending\r | |
148 | multiple descriptors to the virtio ring.\r | |
149 | \r | |
150 | The calling driver must be in VSTAT_DRIVER_OK state.\r | |
151 | \r | |
f2965f4e | 152 | @param[in,out] Ring The virtio ring we intend to append descriptors to.\r |
e371e7e5 | 153 | \r |
154 | @param[out] Indices The DESC_INDICES structure to initialize.\r | |
155 | \r | |
156 | **/\r | |
157 | VOID\r | |
158 | EFIAPI\r | |
159 | VirtioPrepare (\r | |
160 | IN OUT VRING *Ring,\r | |
161 | OUT DESC_INDICES *Indices\r | |
162 | )\r | |
163 | {\r | |
164 | //\r | |
165 | // Prepare for virtio-0.9.5, 2.4.2 Receiving Used Buffers From the Device.\r | |
166 | // We're going to poll the answer, the host should not send an interrupt.\r | |
167 | //\r | |
168 | *Ring->Avail.Flags = (UINT16) VRING_AVAIL_F_NO_INTERRUPT;\r | |
169 | \r | |
170 | //\r | |
171 | // Prepare for virtio-0.9.5, 2.4.1 Supplying Buffers to the Device.\r | |
172 | //\r | |
635a3ca2 | 173 | // Since we support only one in-flight descriptor chain, we can always build\r |
174 | // that chain starting at entry #0 of the descriptor table.\r | |
175 | //\r | |
176 | Indices->HeadDescIdx = 0;\r | |
177 | Indices->NextDescIdx = Indices->HeadDescIdx;\r | |
e371e7e5 | 178 | }\r |
179 | \r | |
180 | \r | |
263559b8 | 181 | /**\r |
182 | \r | |
183 | Append a contiguous buffer for transmission / reception via the virtio ring.\r | |
184 | \r | |
635a3ca2 | 185 | This function implements the following section from virtio-0.9.5:\r |
263559b8 | 186 | - 2.4.1.1 Placing Buffers into the Descriptor Table\r |
263559b8 | 187 | \r |
188 | Free space is taken as granted, since the individual drivers support only\r | |
189 | synchronous requests and host side status is processed in lock-step with\r | |
190 | request submission. It is the calling driver's responsibility to verify the\r | |
191 | ring size in advance.\r | |
192 | \r | |
e371e7e5 | 193 | The caller is responsible for initializing *Indices with VirtioPrepare()\r |
194 | first.\r | |
195 | \r | |
11a5fdf4 | 196 | @param[in,out] Ring The virtio ring to append the buffer to, as a\r |
197 | descriptor.\r | |
198 | \r | |
199 | @param[in] BufferPhysAddr (Guest pseudo-physical) start address of the\r | |
200 | transmit / receive buffer.\r | |
201 | \r | |
202 | @param[in] BufferSize Number of bytes to transmit or receive.\r | |
203 | \r | |
204 | @param[in] Flags A bitmask of VRING_DESC_F_* flags. The caller\r | |
205 | computes this mask dependent on further buffers to\r | |
206 | append and transfer direction.\r | |
207 | VRING_DESC_F_INDIRECT is unsupported. The\r | |
208 | VRING_DESC.Next field is always set, but the host\r | |
209 | only interprets it dependent on VRING_DESC_F_NEXT.\r | |
210 | \r | |
211 | @param[in,out] Indices Indices->HeadDescIdx is not accessed.\r | |
212 | On input, Indices->NextDescIdx identifies the next\r | |
213 | descriptor to carry the buffer. On output,\r | |
214 | Indices->NextDescIdx is incremented by one, modulo\r | |
215 | 2^16.\r | |
263559b8 | 216 | \r |
217 | **/\r | |
218 | VOID\r | |
219 | EFIAPI\r | |
7fcacd6c | 220 | VirtioAppendDesc (\r |
e371e7e5 | 221 | IN OUT VRING *Ring,\r |
222 | IN UINTN BufferPhysAddr,\r | |
223 | IN UINT32 BufferSize,\r | |
224 | IN UINT16 Flags,\r | |
225 | IN OUT DESC_INDICES *Indices\r | |
263559b8 | 226 | )\r |
227 | {\r | |
228 | volatile VRING_DESC *Desc;\r | |
229 | \r | |
635a3ca2 | 230 | Desc = &Ring->Desc[Indices->NextDescIdx++ % Ring->QueueSize];\r |
263559b8 | 231 | Desc->Addr = BufferPhysAddr;\r |
232 | Desc->Len = BufferSize;\r | |
233 | Desc->Flags = Flags;\r | |
635a3ca2 | 234 | Desc->Next = Indices->NextDescIdx % Ring->QueueSize;\r |
e371e7e5 | 235 | }\r |
236 | \r | |
237 | \r | |
238 | /**\r | |
239 | \r | |
635a3ca2 | 240 | Notify the host about the descriptor chain just built, and wait until the\r |
241 | host processes it.\r | |
e371e7e5 | 242 | \r |
56f65ed8 | 243 | @param[in] VirtIo The target virtio device to notify.\r |
e371e7e5 | 244 | \r |
245 | @param[in] VirtQueueId Identifies the queue for the target device.\r | |
246 | \r | |
a7615fa8 | 247 | @param[in,out] Ring The virtio ring with descriptors to submit.\r |
e371e7e5 | 248 | \r |
a7615fa8 | 249 | @param[in] Indices Indices->NextDescIdx is not accessed.\r |
250 | Indices->HeadDescIdx identifies the head descriptor\r | |
251 | of the descriptor chain.\r | |
e371e7e5 | 252 | \r |
8bc951a2 LE |
253 | @param[out] UsedLen On success, the total number of bytes, consecutively\r |
254 | across the buffers linked by the descriptor chain,\r | |
255 | that the host wrote. May be NULL if the caller\r | |
256 | doesn't care, or can compute the same information\r | |
257 | from device-specific request structures linked by the\r | |
258 | descriptor chain.\r | |
e371e7e5 | 259 | \r |
56f65ed8 | 260 | @return Error code from VirtIo->SetQueueNotify() if it fails.\r |
e371e7e5 | 261 | \r |
262 | @retval EFI_SUCCESS Otherwise, the host processed all descriptors.\r | |
263 | \r | |
264 | **/\r | |
265 | EFI_STATUS\r | |
266 | EFIAPI\r | |
267 | VirtioFlush (\r | |
56f65ed8 OM |
268 | IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r |
269 | IN UINT16 VirtQueueId,\r | |
270 | IN OUT VRING *Ring,\r | |
8bc951a2 LE |
271 | IN DESC_INDICES *Indices,\r |
272 | OUT UINT32 *UsedLen OPTIONAL\r | |
e371e7e5 | 273 | )\r |
274 | {\r | |
635a3ca2 | 275 | UINT16 NextAvailIdx;\r |
8bc951a2 | 276 | UINT16 LastUsedIdx;\r |
e371e7e5 | 277 | EFI_STATUS Status;\r |
278 | UINTN PollPeriodUsecs;\r | |
279 | \r | |
635a3ca2 | 280 | //\r |
281 | // virtio-0.9.5, 2.4.1.2 Updating the Available Ring\r | |
282 | //\r | |
283 | // It is not exactly clear from the wording of the virtio-0.9.5\r | |
284 | // specification, but each entry in the Available Ring references only the\r | |
285 | // head descriptor of any given descriptor chain.\r | |
286 | //\r | |
287 | NextAvailIdx = *Ring->Avail.Idx;\r | |
8bc951a2 LE |
288 | //\r |
289 | // (Due to our lock-step progress, this is where the host will produce the\r | |
290 | // used element with the head descriptor's index in it.)\r | |
291 | //\r | |
292 | LastUsedIdx = NextAvailIdx;\r | |
635a3ca2 | 293 | Ring->Avail.Ring[NextAvailIdx++ % Ring->QueueSize] =\r |
294 | Indices->HeadDescIdx % Ring->QueueSize;\r | |
295 | \r | |
e371e7e5 | 296 | //\r |
297 | // virtio-0.9.5, 2.4.1.3 Updating the Index Field\r | |
298 | //\r | |
299 | MemoryFence();\r | |
635a3ca2 | 300 | *Ring->Avail.Idx = NextAvailIdx;\r |
e371e7e5 | 301 | \r |
302 | //\r | |
303 | // virtio-0.9.5, 2.4.1.4 Notifying the Device -- gratuitous notifications are\r | |
304 | // OK.\r | |
305 | //\r | |
306 | MemoryFence();\r | |
56f65ed8 | 307 | Status = VirtIo->SetQueueNotify (VirtIo, VirtQueueId);\r |
e371e7e5 | 308 | if (EFI_ERROR (Status)) {\r |
309 | return Status;\r | |
310 | }\r | |
311 | \r | |
312 | //\r | |
313 | // virtio-0.9.5, 2.4.2 Receiving Used Buffers From the Device\r | |
314 | // Wait until the host processes and acknowledges our descriptor chain. The\r | |
315 | // condition we use for polling is greatly simplified and relies on the\r | |
316 | // synchronous, lock-step progress.\r | |
317 | //\r | |
318 | // Keep slowing down until we reach a poll period of slightly above 1 ms.\r | |
319 | //\r | |
320 | PollPeriodUsecs = 1;\r | |
321 | MemoryFence();\r | |
635a3ca2 | 322 | while (*Ring->Used.Idx != NextAvailIdx) {\r |
e371e7e5 | 323 | gBS->Stall (PollPeriodUsecs); // calls AcpiTimerLib::MicroSecondDelay\r |
324 | \r | |
325 | if (PollPeriodUsecs < 1024) {\r | |
326 | PollPeriodUsecs *= 2;\r | |
327 | }\r | |
328 | MemoryFence();\r | |
329 | }\r | |
330 | \r | |
dc9447bd | 331 | MemoryFence();\r |
8bc951a2 LE |
332 | \r |
333 | if (UsedLen != NULL) {\r | |
334 | volatile CONST VRING_USED_ELEM *UsedElem;\r | |
335 | \r | |
336 | UsedElem = &Ring->Used.UsedElem[LastUsedIdx % Ring->QueueSize];\r | |
337 | ASSERT (UsedElem->Id == Indices->HeadDescIdx);\r | |
338 | *UsedLen = UsedElem->Len;\r | |
339 | }\r | |
340 | \r | |
e371e7e5 | 341 | return EFI_SUCCESS;\r |
263559b8 | 342 | }\r |
d0ece0d8 LE |
343 | \r |
344 | \r | |
345 | /**\r | |
346 | \r | |
347 | Report the feature bits to the VirtIo 1.0 device that the VirtIo 1.0 driver\r | |
348 | understands.\r | |
349 | \r | |
350 | In VirtIo 1.0, a device can reject a self-inconsistent feature bitmap through\r | |
351 | the new VSTAT_FEATURES_OK status bit. (For example if the driver requests a\r | |
352 | higher level feature but clears a prerequisite feature.) This function is a\r | |
353 | small wrapper around VIRTIO_DEVICE_PROTOCOL.SetGuestFeatures() that also\r | |
354 | verifies if the VirtIo 1.0 device accepts the feature bitmap.\r | |
355 | \r | |
356 | @param[in] VirtIo Report feature bits to this device.\r | |
357 | \r | |
358 | @param[in] Features The set of feature bits that the driver wishes\r | |
359 | to report. The caller is responsible to perform\r | |
360 | any masking before calling this function; the\r | |
361 | value is directly written with\r | |
362 | VIRTIO_DEVICE_PROTOCOL.SetGuestFeatures().\r | |
363 | \r | |
364 | @param[in,out] DeviceStatus On input, the status byte most recently written\r | |
365 | to the device's status register. On output (even\r | |
366 | on error), DeviceStatus will be updated so that\r | |
367 | it is suitable for further status bit\r | |
368 | manipulation and writing to the device's status\r | |
369 | register.\r | |
370 | \r | |
371 | @retval EFI_SUCCESS The device accepted the configuration in Features.\r | |
372 | \r | |
373 | @return EFI_UNSUPPORTED The device rejected the configuration in Features.\r | |
374 | \r | |
375 | @retval EFI_UNSUPPORTED VirtIo->Revision is smaller than 1.0.0.\r | |
376 | \r | |
377 | @return Error codes from the SetGuestFeatures(),\r | |
378 | SetDeviceStatus(), GetDeviceStatus() member\r | |
379 | functions.\r | |
380 | \r | |
381 | **/\r | |
382 | EFI_STATUS\r | |
383 | EFIAPI\r | |
384 | Virtio10WriteFeatures (\r | |
385 | IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r | |
386 | IN UINT64 Features,\r | |
387 | IN OUT UINT8 *DeviceStatus\r | |
388 | )\r | |
389 | {\r | |
390 | EFI_STATUS Status;\r | |
391 | \r | |
392 | if (VirtIo->Revision < VIRTIO_SPEC_REVISION (1, 0, 0)) {\r | |
393 | return EFI_UNSUPPORTED;\r | |
394 | }\r | |
395 | \r | |
396 | Status = VirtIo->SetGuestFeatures (VirtIo, Features);\r | |
397 | if (EFI_ERROR (Status)) {\r | |
398 | return Status;\r | |
399 | }\r | |
400 | \r | |
401 | *DeviceStatus |= VSTAT_FEATURES_OK;\r | |
402 | Status = VirtIo->SetDeviceStatus (VirtIo, *DeviceStatus);\r | |
403 | if (EFI_ERROR (Status)) {\r | |
404 | return Status;\r | |
405 | }\r | |
406 | \r | |
407 | Status = VirtIo->GetDeviceStatus (VirtIo, DeviceStatus);\r | |
408 | if (EFI_ERROR (Status)) {\r | |
409 | return Status;\r | |
410 | }\r | |
411 | \r | |
412 | if ((*DeviceStatus & VSTAT_FEATURES_OK) == 0) {\r | |
413 | Status = EFI_UNSUPPORTED;\r | |
414 | }\r | |
415 | \r | |
416 | return Status;\r | |
417 | }\r | |
0a78d754 BS |
418 | \r |
419 | /**\r | |
420 | Provides the virtio device address required to access system memory from a\r | |
421 | DMA bus master.\r | |
422 | \r | |
423 | The interface follows the same usage pattern as defined in UEFI spec 2.6\r | |
424 | (Section 13.2 PCI Root Bridge I/O Protocol)\r | |
425 | \r | |
426 | The VirtioMapAllBytesInSharedBuffer() is similar to VIRTIO_MAP_SHARED\r | |
427 | with exception that NumberOfBytes is IN-only parameter. The function\r | |
428 | maps all the bytes specified in NumberOfBytes param in one consecutive\r | |
429 | range.\r | |
430 | \r | |
431 | @param[in] VirtIo The virtio device for which the mapping is\r | |
432 | requested.\r | |
433 | \r | |
434 | @param[in] Operation Indicates if the bus master is going to\r | |
435 | read or write to system memory.\r | |
436 | \r | |
437 | @param[in] HostAddress The system memory address to map to shared\r | |
438 | buffer address.\r | |
439 | \r | |
440 | @param[in] NumberOfBytes Number of bytes to map.\r | |
441 | \r | |
442 | @param[out] DeviceAddress The resulting shared map address for the\r | |
443 | bus master to access the hosts HostAddress.\r | |
444 | \r | |
445 | @param[out] Mapping A resulting token to pass to\r | |
446 | VIRTIO_UNMAP_SHARED.\r | |
447 | \r | |
448 | \r | |
449 | @retval EFI_SUCCESS The NumberOfBytes is succesfully mapped.\r | |
450 | @retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a\r | |
451 | common buffer.\r | |
452 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r | |
453 | @retval EFI_OUT_OF_RESOURCES The request could not be completed due to\r | |
454 | a lack of resources. This includes the case\r | |
455 | when NumberOfBytes bytes cannot be mapped\r | |
456 | in one consecutive range.\r | |
457 | @retval EFI_DEVICE_ERROR The system hardware could not map the\r | |
458 | requested address.\r | |
459 | **/\r | |
460 | EFI_STATUS\r | |
461 | EFIAPI\r | |
462 | VirtioMapAllBytesInSharedBuffer (\r | |
463 | IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r | |
464 | IN VIRTIO_MAP_OPERATION Operation,\r | |
465 | IN VOID *HostAddress,\r | |
466 | IN UINTN NumberOfBytes,\r | |
467 | OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,\r | |
468 | OUT VOID **Mapping\r | |
469 | )\r | |
470 | {\r | |
471 | EFI_STATUS Status;\r | |
472 | VOID *MapInfo;\r | |
473 | UINTN Size;\r | |
474 | EFI_PHYSICAL_ADDRESS PhysicalAddress;\r | |
475 | \r | |
476 | Size = NumberOfBytes;\r | |
477 | Status = VirtIo->MapSharedBuffer (\r | |
478 | VirtIo,\r | |
479 | Operation,\r | |
480 | HostAddress,\r | |
481 | &Size,\r | |
482 | &PhysicalAddress,\r | |
483 | &MapInfo\r | |
484 | );\r | |
485 | if (EFI_ERROR (Status)) {\r | |
486 | return Status;\r | |
487 | }\r | |
488 | \r | |
489 | if (Size < NumberOfBytes) {\r | |
490 | goto Failed;\r | |
491 | }\r | |
492 | \r | |
493 | *Mapping = MapInfo;\r | |
494 | *DeviceAddress = PhysicalAddress;\r | |
495 | \r | |
496 | return EFI_SUCCESS;\r | |
497 | \r | |
498 | Failed:\r | |
499 | VirtIo->UnmapSharedBuffer (VirtIo, MapInfo);\r | |
500 | return EFI_OUT_OF_RESOURCES;\r | |
501 | }\r |