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f9d129e6 BS |
1 | /** @file\r |
2 | \r | |
812568fb LE |
3 | The protocol provides support to allocate, free, map and umap a DMA buffer\r |
4 | for bus master (e.g PciHostBridge). When SEV is enabled, the DMA operations\r | |
5 | must be performed on unencrypted buffer hence we use a bounce buffer to map\r | |
6 | the guest buffer into an unencrypted DMA buffer.\r | |
f9d129e6 BS |
7 | \r |
8 | Copyright (c) 2017, AMD Inc. All rights reserved.<BR>\r | |
9 | Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>\r | |
10 | \r | |
11 | This program and the accompanying materials are licensed and made available\r | |
12 | under the terms and conditions of the BSD License which accompanies this\r | |
13 | distribution. The full text of the license may be found at\r | |
14 | http://opensource.org/licenses/bsd-license.php\r | |
15 | \r | |
16 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
17 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
18 | \r | |
19 | **/\r | |
20 | \r | |
21 | #include "AmdSevIoMmu.h"\r | |
22 | \r | |
23 | typedef struct {\r | |
24 | EDKII_IOMMU_OPERATION Operation;\r | |
25 | UINTN NumberOfBytes;\r | |
26 | UINTN NumberOfPages;\r | |
c7ef2ed2 | 27 | EFI_PHYSICAL_ADDRESS CryptedAddress;\r |
dc194ce3 | 28 | EFI_PHYSICAL_ADDRESS PlainTextAddress;\r |
f9d129e6 BS |
29 | } MAP_INFO;\r |
30 | \r | |
31 | #define NO_MAPPING (VOID *) (UINTN) -1\r | |
32 | \r | |
33 | /**\r | |
812568fb LE |
34 | Provides the controller-specific addresses required to access system memory\r |
35 | from a DMA bus master. On SEV guest, the DMA operations must be performed on\r | |
36 | shared buffer hence we allocate a bounce buffer to map the HostAddress to a\r | |
37 | DeviceAddress. The Encryption attribute is removed from the DeviceAddress\r | |
38 | buffer.\r | |
f9d129e6 BS |
39 | \r |
40 | @param This The protocol instance pointer.\r | |
41 | @param Operation Indicates if the bus master is going to read or\r | |
42 | write to system memory.\r | |
812568fb LE |
43 | @param HostAddress The system memory address to map to the PCI\r |
44 | controller.\r | |
f9d129e6 | 45 | @param NumberOfBytes On input the number of bytes to map. On output\r |
812568fb LE |
46 | the number of bytes that were mapped.\r |
47 | @param DeviceAddress The resulting map address for the bus master\r | |
48 | PCI controller to use to access the hosts\r | |
49 | HostAddress.\r | |
f9d129e6 BS |
50 | @param Mapping A resulting value to pass to Unmap().\r |
51 | \r | |
812568fb LE |
52 | @retval EFI_SUCCESS The range was mapped for the returned\r |
53 | NumberOfBytes.\r | |
54 | @retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common\r | |
55 | buffer.\r | |
f9d129e6 | 56 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r |
812568fb LE |
57 | @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a\r |
58 | lack of resources.\r | |
59 | @retval EFI_DEVICE_ERROR The system hardware could not map the requested\r | |
60 | address.\r | |
f9d129e6 BS |
61 | \r |
62 | **/\r | |
63 | EFI_STATUS\r | |
64 | EFIAPI\r | |
65 | IoMmuMap (\r | |
66 | IN EDKII_IOMMU_PROTOCOL *This,\r | |
67 | IN EDKII_IOMMU_OPERATION Operation,\r | |
68 | IN VOID *HostAddress,\r | |
69 | IN OUT UINTN *NumberOfBytes,\r | |
70 | OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,\r | |
71 | OUT VOID **Mapping\r | |
72 | )\r | |
73 | {\r | |
74 | EFI_STATUS Status;\r | |
75 | EFI_PHYSICAL_ADDRESS PhysicalAddress;\r | |
76 | MAP_INFO *MapInfo;\r | |
77 | EFI_PHYSICAL_ADDRESS DmaMemoryTop;\r | |
78 | EFI_ALLOCATE_TYPE AllocateType;\r | |
79 | \r | |
80 | if (HostAddress == NULL || NumberOfBytes == NULL || DeviceAddress == NULL ||\r | |
81 | Mapping == NULL) {\r | |
82 | return EFI_INVALID_PARAMETER;\r | |
83 | }\r | |
84 | \r | |
85 | //\r | |
86 | // Make sure that Operation is valid\r | |
87 | //\r | |
88 | if ((UINT32) Operation >= EdkiiIoMmuOperationMaximum) {\r | |
89 | return EFI_INVALID_PARAMETER;\r | |
90 | }\r | |
91 | PhysicalAddress = (EFI_PHYSICAL_ADDRESS) (UINTN) HostAddress;\r | |
92 | \r | |
93 | DmaMemoryTop = (UINTN)-1;\r | |
94 | AllocateType = AllocateAnyPages;\r | |
95 | \r | |
96 | if (((Operation != EdkiiIoMmuOperationBusMasterRead64 &&\r | |
97 | Operation != EdkiiIoMmuOperationBusMasterWrite64 &&\r | |
98 | Operation != EdkiiIoMmuOperationBusMasterCommonBuffer64)) &&\r | |
99 | ((PhysicalAddress + *NumberOfBytes) > SIZE_4GB)) {\r | |
100 | //\r | |
101 | // If the root bridge or the device cannot handle performing DMA above\r | |
102 | // 4GB but any part of the DMA transfer being mapped is above 4GB, then\r | |
103 | // map the DMA transfer to a buffer below 4GB.\r | |
104 | //\r | |
105 | DmaMemoryTop = SIZE_4GB - 1;\r | |
106 | AllocateType = AllocateMaxAddress;\r | |
107 | \r | |
108 | if (Operation == EdkiiIoMmuOperationBusMasterCommonBuffer ||\r | |
109 | Operation == EdkiiIoMmuOperationBusMasterCommonBuffer64) {\r | |
110 | //\r | |
111 | // Common Buffer operations can not be remapped. If the common buffer\r | |
812568fb LE |
112 | // if above 4GB, then it is not possible to generate a mapping, so\r |
113 | // return an error.\r | |
f9d129e6 BS |
114 | //\r |
115 | return EFI_UNSUPPORTED;\r | |
116 | }\r | |
117 | }\r | |
118 | \r | |
119 | //\r | |
120 | // CommandBuffer was allocated by us (AllocateBuffer) and is already in\r | |
121 | // unencryted buffer so no need to create bounce buffer\r | |
122 | //\r | |
123 | if (Operation == EdkiiIoMmuOperationBusMasterCommonBuffer ||\r | |
124 | Operation == EdkiiIoMmuOperationBusMasterCommonBuffer64) {\r | |
125 | *Mapping = NO_MAPPING;\r | |
126 | *DeviceAddress = PhysicalAddress;\r | |
127 | \r | |
128 | return EFI_SUCCESS;\r | |
129 | }\r | |
130 | \r | |
131 | //\r | |
132 | // Allocate a MAP_INFO structure to remember the mapping when Unmap() is\r | |
133 | // called later.\r | |
134 | //\r | |
135 | MapInfo = AllocatePool (sizeof (MAP_INFO));\r | |
136 | if (MapInfo == NULL) {\r | |
137 | *NumberOfBytes = 0;\r | |
138 | return EFI_OUT_OF_RESOURCES;\r | |
139 | }\r | |
140 | \r | |
141 | //\r | |
142 | // Initialize the MAP_INFO structure\r | |
143 | //\r | |
144 | MapInfo->Operation = Operation;\r | |
145 | MapInfo->NumberOfBytes = *NumberOfBytes;\r | |
146 | MapInfo->NumberOfPages = EFI_SIZE_TO_PAGES (MapInfo->NumberOfBytes);\r | |
c7ef2ed2 | 147 | MapInfo->CryptedAddress = PhysicalAddress;\r |
dc194ce3 | 148 | MapInfo->PlainTextAddress = DmaMemoryTop;\r |
f9d129e6 BS |
149 | \r |
150 | //\r | |
151 | // Allocate a buffer to map the transfer to.\r | |
152 | //\r | |
153 | Status = gBS->AllocatePages (\r | |
154 | AllocateType,\r | |
155 | EfiBootServicesData,\r | |
156 | MapInfo->NumberOfPages,\r | |
dc194ce3 | 157 | &MapInfo->PlainTextAddress\r |
f9d129e6 BS |
158 | );\r |
159 | if (EFI_ERROR (Status)) {\r | |
160 | FreePool (MapInfo);\r | |
161 | *NumberOfBytes = 0;\r | |
162 | return Status;\r | |
163 | }\r | |
164 | \r | |
165 | //\r | |
166 | // Clear the memory encryption mask from the device buffer\r | |
167 | //\r | |
812568fb LE |
168 | Status = MemEncryptSevClearPageEncMask (\r |
169 | 0,\r | |
dc194ce3 | 170 | MapInfo->PlainTextAddress,\r |
812568fb LE |
171 | MapInfo->NumberOfPages,\r |
172 | TRUE\r | |
173 | );\r | |
f9d129e6 BS |
174 | ASSERT_EFI_ERROR(Status);\r |
175 | \r | |
176 | //\r | |
177 | // If this is a read operation from the Bus Master's point of view,\r | |
178 | // then copy the contents of the real buffer into the mapped buffer\r | |
179 | // so the Bus Master can read the contents of the real buffer.\r | |
180 | //\r | |
181 | if (Operation == EdkiiIoMmuOperationBusMasterRead ||\r | |
182 | Operation == EdkiiIoMmuOperationBusMasterRead64) {\r | |
183 | CopyMem (\r | |
dc194ce3 | 184 | (VOID *) (UINTN) MapInfo->PlainTextAddress,\r |
c7ef2ed2 | 185 | (VOID *) (UINTN) MapInfo->CryptedAddress,\r |
f9d129e6 BS |
186 | MapInfo->NumberOfBytes\r |
187 | );\r | |
188 | }\r | |
189 | \r | |
190 | //\r | |
191 | // The DeviceAddress is the address of the maped buffer below 4GB\r | |
192 | //\r | |
dc194ce3 | 193 | *DeviceAddress = MapInfo->PlainTextAddress;\r |
f9d129e6 BS |
194 | \r |
195 | //\r | |
196 | // Return a pointer to the MAP_INFO structure in Mapping\r | |
197 | //\r | |
198 | *Mapping = MapInfo;\r | |
199 | \r | |
812568fb LE |
200 | DEBUG ((\r |
201 | DEBUG_VERBOSE,\r | |
c7ef2ed2 | 202 | "%a PlainText 0x%Lx Crypted 0x%Lx Pages 0x%Lx Bytes 0x%Lx\n",\r |
812568fb | 203 | __FUNCTION__,\r |
dc194ce3 | 204 | MapInfo->PlainTextAddress,\r |
c7ef2ed2 | 205 | MapInfo->CryptedAddress,\r |
60aa3a0e LE |
206 | (UINT64)MapInfo->NumberOfPages,\r |
207 | (UINT64)MapInfo->NumberOfBytes\r | |
812568fb | 208 | ));\r |
f9d129e6 BS |
209 | \r |
210 | return EFI_SUCCESS;\r | |
211 | }\r | |
212 | \r | |
213 | /**\r | |
214 | Completes the Map() operation and releases any corresponding resources.\r | |
215 | \r | |
216 | @param This The protocol instance pointer.\r | |
217 | @param Mapping The mapping value returned from Map().\r | |
218 | \r | |
219 | @retval EFI_SUCCESS The range was unmapped.\r | |
812568fb LE |
220 | @retval EFI_INVALID_PARAMETER Mapping is not a value that was returned by\r |
221 | Map().\r | |
222 | @retval EFI_DEVICE_ERROR The data was not committed to the target system\r | |
223 | memory.\r | |
f9d129e6 BS |
224 | **/\r |
225 | EFI_STATUS\r | |
226 | EFIAPI\r | |
227 | IoMmuUnmap (\r | |
228 | IN EDKII_IOMMU_PROTOCOL *This,\r | |
229 | IN VOID *Mapping\r | |
230 | )\r | |
231 | {\r | |
232 | MAP_INFO *MapInfo;\r | |
233 | EFI_STATUS Status;\r | |
234 | \r | |
235 | if (Mapping == NULL) {\r | |
236 | return EFI_INVALID_PARAMETER;\r | |
237 | }\r | |
238 | \r | |
239 | //\r | |
240 | // See if the Map() operation associated with this Unmap() required a mapping\r | |
241 | // buffer. If a mapping buffer was not required, then this function simply\r | |
242 | // buffer. If a mapping buffer was not required, then this function simply\r | |
243 | //\r | |
244 | if (Mapping == NO_MAPPING) {\r | |
245 | return EFI_SUCCESS;\r | |
246 | }\r | |
247 | \r | |
248 | MapInfo = (MAP_INFO *)Mapping;\r | |
249 | \r | |
250 | //\r | |
251 | // If this is a write operation from the Bus Master's point of view,\r | |
252 | // then copy the contents of the mapped buffer into the real buffer\r | |
253 | // so the processor can read the contents of the real buffer.\r | |
254 | //\r | |
255 | if (MapInfo->Operation == EdkiiIoMmuOperationBusMasterWrite ||\r | |
256 | MapInfo->Operation == EdkiiIoMmuOperationBusMasterWrite64) {\r | |
257 | CopyMem (\r | |
c7ef2ed2 | 258 | (VOID *) (UINTN) MapInfo->CryptedAddress,\r |
dc194ce3 | 259 | (VOID *) (UINTN) MapInfo->PlainTextAddress,\r |
f9d129e6 BS |
260 | MapInfo->NumberOfBytes\r |
261 | );\r | |
262 | }\r | |
263 | \r | |
812568fb LE |
264 | DEBUG ((\r |
265 | DEBUG_VERBOSE,\r | |
c7ef2ed2 | 266 | "%a PlainText 0x%Lx Crypted 0x%Lx Pages 0x%Lx Bytes 0x%Lx\n",\r |
812568fb | 267 | __FUNCTION__,\r |
dc194ce3 | 268 | MapInfo->PlainTextAddress,\r |
c7ef2ed2 | 269 | MapInfo->CryptedAddress,\r |
60aa3a0e LE |
270 | (UINT64)MapInfo->NumberOfPages,\r |
271 | (UINT64)MapInfo->NumberOfBytes\r | |
812568fb | 272 | ));\r |
f9d129e6 BS |
273 | //\r |
274 | // Restore the memory encryption mask\r | |
275 | //\r | |
812568fb LE |
276 | Status = MemEncryptSevSetPageEncMask (\r |
277 | 0,\r | |
dc194ce3 | 278 | MapInfo->PlainTextAddress,\r |
812568fb LE |
279 | MapInfo->NumberOfPages,\r |
280 | TRUE\r | |
281 | );\r | |
f9d129e6 BS |
282 | ASSERT_EFI_ERROR(Status);\r |
283 | \r | |
284 | //\r | |
285 | // Free the mapped buffer and the MAP_INFO structure.\r | |
286 | //\r | |
dc194ce3 | 287 | gBS->FreePages (MapInfo->PlainTextAddress, MapInfo->NumberOfPages);\r |
f9d129e6 BS |
288 | FreePool (Mapping);\r |
289 | return EFI_SUCCESS;\r | |
290 | }\r | |
291 | \r | |
292 | /**\r | |
293 | Allocates pages that are suitable for an OperationBusMasterCommonBuffer or\r | |
294 | OperationBusMasterCommonBuffer64 mapping.\r | |
295 | \r | |
296 | @param This The protocol instance pointer.\r | |
297 | @param Type This parameter is not used and must be ignored.\r | |
812568fb LE |
298 | @param MemoryType The type of memory to allocate,\r |
299 | EfiBootServicesData or EfiRuntimeServicesData.\r | |
f9d129e6 | 300 | @param Pages The number of pages to allocate.\r |
812568fb LE |
301 | @param HostAddress A pointer to store the base system memory\r |
302 | address of the allocated range.\r | |
303 | @param Attributes The requested bit mask of attributes for the\r | |
304 | allocated range.\r | |
f9d129e6 BS |
305 | \r |
306 | @retval EFI_SUCCESS The requested memory pages were allocated.\r | |
812568fb LE |
307 | @retval EFI_UNSUPPORTED Attributes is unsupported. The only legal\r |
308 | attribute bits are MEMORY_WRITE_COMBINE and\r | |
309 | MEMORY_CACHED.\r | |
f9d129e6 BS |
310 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r |
311 | @retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.\r | |
312 | \r | |
313 | **/\r | |
314 | EFI_STATUS\r | |
315 | EFIAPI\r | |
316 | IoMmuAllocateBuffer (\r | |
317 | IN EDKII_IOMMU_PROTOCOL *This,\r | |
318 | IN EFI_ALLOCATE_TYPE Type,\r | |
319 | IN EFI_MEMORY_TYPE MemoryType,\r | |
320 | IN UINTN Pages,\r | |
321 | IN OUT VOID **HostAddress,\r | |
322 | IN UINT64 Attributes\r | |
323 | )\r | |
324 | {\r | |
325 | EFI_STATUS Status;\r | |
326 | EFI_PHYSICAL_ADDRESS PhysicalAddress;\r | |
327 | \r | |
328 | //\r | |
329 | // Validate Attributes\r | |
330 | //\r | |
331 | if ((Attributes & EDKII_IOMMU_ATTRIBUTE_INVALID_FOR_ALLOCATE_BUFFER) != 0) {\r | |
332 | return EFI_UNSUPPORTED;\r | |
333 | }\r | |
334 | \r | |
335 | //\r | |
336 | // Check for invalid inputs\r | |
337 | //\r | |
338 | if (HostAddress == NULL) {\r | |
339 | return EFI_INVALID_PARAMETER;\r | |
340 | }\r | |
341 | \r | |
342 | //\r | |
343 | // The only valid memory types are EfiBootServicesData and\r | |
344 | // EfiRuntimeServicesData\r | |
345 | //\r | |
346 | if (MemoryType != EfiBootServicesData &&\r | |
347 | MemoryType != EfiRuntimeServicesData) {\r | |
348 | return EFI_INVALID_PARAMETER;\r | |
349 | }\r | |
350 | \r | |
351 | PhysicalAddress = (UINTN)-1;\r | |
352 | if ((Attributes & EDKII_IOMMU_ATTRIBUTE_DUAL_ADDRESS_CYCLE) == 0) {\r | |
353 | //\r | |
354 | // Limit allocations to memory below 4GB\r | |
355 | //\r | |
356 | PhysicalAddress = SIZE_4GB - 1;\r | |
357 | }\r | |
358 | Status = gBS->AllocatePages (\r | |
359 | AllocateMaxAddress,\r | |
360 | MemoryType,\r | |
361 | Pages,\r | |
362 | &PhysicalAddress\r | |
363 | );\r | |
364 | if (!EFI_ERROR (Status)) {\r | |
365 | *HostAddress = (VOID *) (UINTN) PhysicalAddress;\r | |
366 | \r | |
367 | //\r | |
368 | // Clear memory encryption mask\r | |
369 | //\r | |
370 | Status = MemEncryptSevClearPageEncMask (0, PhysicalAddress, Pages, TRUE);\r | |
371 | ASSERT_EFI_ERROR(Status);\r | |
372 | }\r | |
373 | \r | |
812568fb LE |
374 | DEBUG ((\r |
375 | DEBUG_VERBOSE,\r | |
376 | "%a Address 0x%Lx Pages 0x%Lx\n",\r | |
377 | __FUNCTION__,\r | |
378 | PhysicalAddress,\r | |
60aa3a0e | 379 | (UINT64)Pages\r |
812568fb | 380 | ));\r |
f9d129e6 BS |
381 | return Status;\r |
382 | }\r | |
383 | \r | |
384 | /**\r | |
385 | Frees memory that was allocated with AllocateBuffer().\r | |
386 | \r | |
387 | @param This The protocol instance pointer.\r | |
388 | @param Pages The number of pages to free.\r | |
812568fb LE |
389 | @param HostAddress The base system memory address of the allocated\r |
390 | range.\r | |
f9d129e6 BS |
391 | \r |
392 | @retval EFI_SUCCESS The requested memory pages were freed.\r | |
812568fb LE |
393 | @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and\r |
394 | Pages was not allocated with AllocateBuffer().\r | |
f9d129e6 BS |
395 | \r |
396 | **/\r | |
397 | EFI_STATUS\r | |
398 | EFIAPI\r | |
399 | IoMmuFreeBuffer (\r | |
400 | IN EDKII_IOMMU_PROTOCOL *This,\r | |
401 | IN UINTN Pages,\r | |
402 | IN VOID *HostAddress\r | |
403 | )\r | |
404 | {\r | |
405 | EFI_STATUS Status;\r | |
406 | \r | |
407 | //\r | |
408 | // Set memory encryption mask\r | |
409 | //\r | |
812568fb LE |
410 | Status = MemEncryptSevSetPageEncMask (\r |
411 | 0,\r | |
412 | (EFI_PHYSICAL_ADDRESS)(UINTN)HostAddress,\r | |
413 | Pages,\r | |
414 | TRUE\r | |
415 | );\r | |
f9d129e6 BS |
416 | ASSERT_EFI_ERROR(Status);\r |
417 | \r | |
812568fb LE |
418 | DEBUG ((\r |
419 | DEBUG_VERBOSE,\r | |
420 | "%a Address 0x%Lx Pages 0x%Lx\n",\r | |
421 | __FUNCTION__,\r | |
60aa3a0e LE |
422 | (UINT64)(UINTN)HostAddress,\r |
423 | (UINT64)Pages\r | |
812568fb | 424 | ));\r |
f9d129e6 BS |
425 | return gBS->FreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) HostAddress, Pages);\r |
426 | }\r | |
427 | \r | |
428 | \r | |
429 | /**\r | |
430 | Set IOMMU attribute for a system memory.\r | |
431 | \r | |
432 | If the IOMMU protocol exists, the system memory cannot be used\r | |
433 | for DMA by default.\r | |
434 | \r | |
435 | When a device requests a DMA access for a system memory,\r | |
436 | the device driver need use SetAttribute() to update the IOMMU\r | |
437 | attribute to request DMA access (read and/or write).\r | |
438 | \r | |
439 | The DeviceHandle is used to identify which device submits the request.\r | |
812568fb LE |
440 | The IOMMU implementation need translate the device path to an IOMMU device\r |
441 | ID, and set IOMMU hardware register accordingly.\r | |
f9d129e6 BS |
442 | 1) DeviceHandle can be a standard PCI device.\r |
443 | The memory for BusMasterRead need set EDKII_IOMMU_ACCESS_READ.\r | |
444 | The memory for BusMasterWrite need set EDKII_IOMMU_ACCESS_WRITE.\r | |
812568fb LE |
445 | The memory for BusMasterCommonBuffer need set\r |
446 | EDKII_IOMMU_ACCESS_READ|EDKII_IOMMU_ACCESS_WRITE.\r | |
447 | After the memory is used, the memory need set 0 to keep it being\r | |
448 | protected.\r | |
f9d129e6 | 449 | 2) DeviceHandle can be an ACPI device (ISA, I2C, SPI, etc).\r |
812568fb LE |
450 | The memory for DMA access need set EDKII_IOMMU_ACCESS_READ and/or\r |
451 | EDKII_IOMMU_ACCESS_WRITE.\r | |
f9d129e6 BS |
452 | \r |
453 | @param[in] This The protocol instance pointer.\r | |
812568fb LE |
454 | @param[in] DeviceHandle The device who initiates the DMA access\r |
455 | request.\r | |
f9d129e6 BS |
456 | @param[in] Mapping The mapping value returned from Map().\r |
457 | @param[in] IoMmuAccess The IOMMU access.\r | |
458 | \r | |
812568fb LE |
459 | @retval EFI_SUCCESS The IoMmuAccess is set for the memory range\r |
460 | specified by DeviceAddress and Length.\r | |
f9d129e6 | 461 | @retval EFI_INVALID_PARAMETER DeviceHandle is an invalid handle.\r |
812568fb LE |
462 | @retval EFI_INVALID_PARAMETER Mapping is not a value that was returned by\r |
463 | Map().\r | |
464 | @retval EFI_INVALID_PARAMETER IoMmuAccess specified an illegal combination\r | |
465 | of access.\r | |
f9d129e6 | 466 | @retval EFI_UNSUPPORTED DeviceHandle is unknown by the IOMMU.\r |
812568fb LE |
467 | @retval EFI_UNSUPPORTED The bit mask of IoMmuAccess is not supported\r |
468 | by the IOMMU.\r | |
469 | @retval EFI_UNSUPPORTED The IOMMU does not support the memory range\r | |
470 | specified by Mapping.\r | |
471 | @retval EFI_OUT_OF_RESOURCES There are not enough resources available to\r | |
472 | modify the IOMMU access.\r | |
473 | @retval EFI_DEVICE_ERROR The IOMMU device reported an error while\r | |
474 | attempting the operation.\r | |
f9d129e6 BS |
475 | \r |
476 | **/\r | |
477 | EFI_STATUS\r | |
478 | EFIAPI\r | |
479 | IoMmuSetAttribute (\r | |
480 | IN EDKII_IOMMU_PROTOCOL *This,\r | |
481 | IN EFI_HANDLE DeviceHandle,\r | |
482 | IN VOID *Mapping,\r | |
483 | IN UINT64 IoMmuAccess\r | |
484 | )\r | |
485 | {\r | |
486 | return EFI_UNSUPPORTED;\r | |
487 | }\r | |
488 | \r | |
489 | EDKII_IOMMU_PROTOCOL mAmdSev = {\r | |
490 | EDKII_IOMMU_PROTOCOL_REVISION,\r | |
491 | IoMmuSetAttribute,\r | |
492 | IoMmuMap,\r | |
493 | IoMmuUnmap,\r | |
494 | IoMmuAllocateBuffer,\r | |
495 | IoMmuFreeBuffer,\r | |
496 | };\r | |
497 | \r | |
498 | /**\r | |
499 | Initialize Iommu Protocol.\r | |
500 | \r | |
501 | **/\r | |
db125079 | 502 | EFI_STATUS\r |
f9d129e6 BS |
503 | EFIAPI\r |
504 | AmdSevInstallIoMmuProtocol (\r | |
505 | VOID\r | |
506 | )\r | |
507 | {\r | |
508 | EFI_STATUS Status;\r | |
509 | EFI_HANDLE Handle;\r | |
510 | \r | |
511 | Handle = NULL;\r | |
512 | Status = gBS->InstallMultipleProtocolInterfaces (\r | |
513 | &Handle,\r | |
514 | &gEdkiiIoMmuProtocolGuid, &mAmdSev,\r | |
515 | NULL\r | |
516 | );\r | |
db125079 | 517 | return Status;\r |
f9d129e6 | 518 | }\r |