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Commit | Line | Data |
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f9d129e6 BS |
1 | /** @file\r |
2 | \r | |
812568fb | 3 | The protocol provides support to allocate, free, map and umap a DMA buffer\r |
25201821 MX |
4 | for bus master (e.g PciHostBridge). When SEV or TDX is enabled, the DMA\r |
5 | operations must be performed on unencrypted buffer hence we use a bounce\r | |
6 | buffer to map 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 | |
b26f0cf9 | 11 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
f9d129e6 BS |
12 | \r |
13 | **/\r | |
14 | \r | |
25201821 MX |
15 | #include <Library/PcdLib.h>\r |
16 | #include <ConfidentialComputingGuestAttr.h>\r | |
f9d129e6 | 17 | #include "AmdSevIoMmu.h"\r |
c4e76d2f | 18 | #include "IoMmuInternal.h"\r |
f9d129e6 | 19 | \r |
d0c9afea | 20 | //\r |
9ed745b9 LE |
21 | // List of the MAP_INFO structures that have been set up by IoMmuMap() and not\r |
22 | // yet torn down by IoMmuUnmap(). The list represents the full set of mappings\r | |
23 | // currently in effect.\r | |
d0c9afea | 24 | //\r |
ac0a286f | 25 | STATIC LIST_ENTRY mMapInfos = INITIALIZE_LIST_HEAD_VARIABLE (mMapInfos);\r |
d0c9afea | 26 | \r |
c4e76d2f MX |
27 | //\r |
28 | // Indicate if the feature of reserved memory is supported in DMA operation.\r | |
29 | //\r | |
30 | BOOLEAN mReservedSharedMemSupported = FALSE;\r | |
58e68140 | 31 | \r |
2ad6ba80 LE |
32 | //\r |
33 | // ASCII names for EDKII_IOMMU_OPERATION constants, for debug logging.\r | |
34 | //\r | |
ac0a286f | 35 | STATIC CONST CHAR8 *CONST\r |
2ad6ba80 LE |
36 | mBusMasterOperationName[EdkiiIoMmuOperationMaximum] = {\r |
37 | "Read",\r | |
38 | "Write",\r | |
39 | "CommonBuffer",\r | |
40 | "Read64",\r | |
41 | "Write64",\r | |
42 | "CommonBuffer64"\r | |
43 | };\r | |
44 | \r | |
f9d129e6 | 45 | /**\r |
812568fb | 46 | Provides the controller-specific addresses required to access system memory\r |
25201821 | 47 | from a DMA bus master. On SEV/TDX guest, the DMA operations must be performed on\r |
812568fb LE |
48 | shared buffer hence we allocate a bounce buffer to map the HostAddress to a\r |
49 | DeviceAddress. The Encryption attribute is removed from the DeviceAddress\r | |
50 | buffer.\r | |
f9d129e6 BS |
51 | \r |
52 | @param This The protocol instance pointer.\r | |
53 | @param Operation Indicates if the bus master is going to read or\r | |
54 | write to system memory.\r | |
812568fb LE |
55 | @param HostAddress The system memory address to map to the PCI\r |
56 | controller.\r | |
f9d129e6 | 57 | @param NumberOfBytes On input the number of bytes to map. On output\r |
812568fb LE |
58 | the number of bytes that were mapped.\r |
59 | @param DeviceAddress The resulting map address for the bus master\r | |
60 | PCI controller to use to access the hosts\r | |
61 | HostAddress.\r | |
f9d129e6 BS |
62 | @param Mapping A resulting value to pass to Unmap().\r |
63 | \r | |
812568fb LE |
64 | @retval EFI_SUCCESS The range was mapped for the returned\r |
65 | NumberOfBytes.\r | |
66 | @retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common\r | |
67 | buffer.\r | |
f9d129e6 | 68 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r |
812568fb LE |
69 | @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a\r |
70 | lack of resources.\r | |
71 | @retval EFI_DEVICE_ERROR The system hardware could not map the requested\r | |
72 | address.\r | |
f9d129e6 BS |
73 | \r |
74 | **/\r | |
75 | EFI_STATUS\r | |
76 | EFIAPI\r | |
77 | IoMmuMap (\r | |
ac0a286f MK |
78 | IN EDKII_IOMMU_PROTOCOL *This,\r |
79 | IN EDKII_IOMMU_OPERATION Operation,\r | |
80 | IN VOID *HostAddress,\r | |
81 | IN OUT UINTN *NumberOfBytes,\r | |
82 | OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,\r | |
83 | OUT VOID **Mapping\r | |
f9d129e6 BS |
84 | )\r |
85 | {\r | |
ac0a286f MK |
86 | EFI_STATUS Status;\r |
87 | MAP_INFO *MapInfo;\r | |
88 | EFI_ALLOCATE_TYPE AllocateType;\r | |
89 | COMMON_BUFFER_HEADER *CommonBufferHeader;\r | |
90 | VOID *DecryptionSource;\r | |
f9d129e6 | 91 | \r |
2ad6ba80 LE |
92 | DEBUG ((\r |
93 | DEBUG_VERBOSE,\r | |
94 | "%a: Operation=%a Host=0x%p Bytes=0x%Lx\n",\r | |
95 | __FUNCTION__,\r | |
96 | ((Operation >= 0 &&\r | |
97 | Operation < ARRAY_SIZE (mBusMasterOperationName)) ?\r | |
98 | mBusMasterOperationName[Operation] :\r | |
99 | "Invalid"),\r | |
100 | HostAddress,\r | |
101 | (UINT64)((NumberOfBytes == NULL) ? 0 : *NumberOfBytes)\r | |
102 | ));\r | |
103 | \r | |
ac0a286f MK |
104 | if ((HostAddress == NULL) || (NumberOfBytes == NULL) || (DeviceAddress == NULL) ||\r |
105 | (Mapping == NULL))\r | |
106 | {\r | |
f9d129e6 BS |
107 | return EFI_INVALID_PARAMETER;\r |
108 | }\r | |
109 | \r | |
c4e76d2f MX |
110 | Status = EFI_SUCCESS;\r |
111 | \r | |
f9d129e6 BS |
112 | //\r |
113 | // Allocate a MAP_INFO structure to remember the mapping when Unmap() is\r | |
114 | // called later.\r | |
115 | //\r | |
9ed745b9 LE |
116 | MapInfo = AllocatePool (sizeof (MAP_INFO));\r |
117 | if (MapInfo == NULL) {\r | |
118 | Status = EFI_OUT_OF_RESOURCES;\r | |
119 | goto Failed;\r | |
f9d129e6 BS |
120 | }\r |
121 | \r | |
122 | //\r | |
e130229c | 123 | // Initialize the MAP_INFO structure, except the PlainTextAddress field\r |
f9d129e6 | 124 | //\r |
d0c9afea | 125 | ZeroMem (&MapInfo->Link, sizeof MapInfo->Link);\r |
c4e76d2f MX |
126 | MapInfo->Signature = MAP_INFO_SIG;\r |
127 | MapInfo->Operation = Operation;\r | |
128 | MapInfo->NumberOfBytes = *NumberOfBytes;\r | |
129 | MapInfo->NumberOfPages = EFI_SIZE_TO_PAGES (MapInfo->NumberOfBytes);\r | |
130 | MapInfo->CryptedAddress = (UINTN)HostAddress;\r | |
131 | MapInfo->ReservedMemBitmap = 0;\r | |
f9d129e6 BS |
132 | \r |
133 | //\r | |
e130229c | 134 | // In the switch statement below, we point "MapInfo->PlainTextAddress" to the\r |
58e68140 | 135 | // plaintext buffer, according to Operation. We also set "DecryptionSource".\r |
e130229c LE |
136 | //\r |
137 | MapInfo->PlainTextAddress = MAX_ADDRESS;\r | |
ac0a286f MK |
138 | AllocateType = AllocateAnyPages;\r |
139 | DecryptionSource = (VOID *)(UINTN)MapInfo->CryptedAddress;\r | |
e130229c | 140 | switch (Operation) {\r |
e130229c | 141 | //\r |
ac0a286f MK |
142 | // For BusMasterRead[64] and BusMasterWrite[64] operations, a bounce buffer\r |
143 | // is necessary regardless of whether the original (crypted) buffer crosses\r | |
144 | // the 4GB limit or not -- we have to allocate a separate plaintext buffer.\r | |
145 | // The only variable is whether the plaintext buffer should be under 4GB.\r | |
e130229c | 146 | //\r |
ac0a286f MK |
147 | case EdkiiIoMmuOperationBusMasterRead:\r |
148 | case EdkiiIoMmuOperationBusMasterWrite:\r | |
149 | MapInfo->PlainTextAddress = BASE_4GB - 1;\r | |
150 | AllocateType = AllocateMaxAddress;\r | |
e130229c | 151 | //\r |
ac0a286f | 152 | // fall through\r |
e130229c | 153 | //\r |
ac0a286f MK |
154 | case EdkiiIoMmuOperationBusMasterRead64:\r |
155 | case EdkiiIoMmuOperationBusMasterWrite64:\r | |
e130229c | 156 | //\r |
ac0a286f | 157 | // Allocate the implicit plaintext bounce buffer.\r |
e130229c | 158 | //\r |
c4e76d2f MX |
159 | Status = IoMmuAllocateBounceBuffer (\r |
160 | AllocateType,\r | |
161 | EfiBootServicesData,\r | |
162 | MapInfo\r | |
163 | );\r | |
ac0a286f MK |
164 | if (EFI_ERROR (Status)) {\r |
165 | goto FreeMapInfo;\r | |
166 | }\r | |
167 | \r | |
168 | break;\r | |
169 | \r | |
58e68140 | 170 | //\r |
ac0a286f MK |
171 | // For BusMasterCommonBuffer[64] operations, a to-be-plaintext buffer and a\r |
172 | // stash buffer (for in-place decryption) have been allocated already, with\r | |
173 | // AllocateBuffer(). We only check whether the address of the to-be-plaintext\r | |
174 | // buffer is low enough for the requested operation.\r | |
e130229c | 175 | //\r |
ac0a286f MK |
176 | case EdkiiIoMmuOperationBusMasterCommonBuffer:\r |
177 | if ((MapInfo->CryptedAddress > BASE_4GB) ||\r | |
178 | (EFI_PAGES_TO_SIZE (MapInfo->NumberOfPages) >\r | |
179 | BASE_4GB - MapInfo->CryptedAddress))\r | |
180 | {\r | |
181 | //\r | |
182 | // CommonBuffer operations cannot be remapped. If the common buffer is\r | |
183 | // above 4GB, then it is not possible to generate a mapping, so return an\r | |
184 | // error.\r | |
185 | //\r | |
186 | Status = EFI_UNSUPPORTED;\r | |
187 | goto FreeMapInfo;\r | |
188 | }\r | |
e130229c | 189 | \r |
e130229c | 190 | //\r |
ac0a286f | 191 | // fall through\r |
e130229c | 192 | //\r |
ac0a286f MK |
193 | case EdkiiIoMmuOperationBusMasterCommonBuffer64:\r |
194 | //\r | |
195 | // The buffer at MapInfo->CryptedAddress comes from AllocateBuffer().\r | |
196 | //\r | |
197 | MapInfo->PlainTextAddress = MapInfo->CryptedAddress;\r | |
198 | //\r | |
199 | // Stash the crypted data.\r | |
200 | //\r | |
201 | CommonBufferHeader = (COMMON_BUFFER_HEADER *)(\r | |
202 | (UINTN)MapInfo->CryptedAddress - EFI_PAGE_SIZE\r | |
203 | );\r | |
204 | ASSERT (CommonBufferHeader->Signature == COMMON_BUFFER_SIG);\r | |
205 | CopyMem (\r | |
206 | CommonBufferHeader->StashBuffer,\r | |
207 | (VOID *)(UINTN)MapInfo->CryptedAddress,\r | |
208 | MapInfo->NumberOfBytes\r | |
209 | );\r | |
210 | //\r | |
211 | // Point "DecryptionSource" to the stash buffer so that we decrypt\r | |
212 | // it to the original location, after the switch statement.\r | |
213 | //\r | |
c4e76d2f MX |
214 | DecryptionSource = CommonBufferHeader->StashBuffer;\r |
215 | MapInfo->ReservedMemBitmap = CommonBufferHeader->ReservedMemBitmap;\r | |
ac0a286f MK |
216 | break;\r |
217 | \r | |
218 | default:\r | |
219 | //\r | |
220 | // Operation is invalid\r | |
221 | //\r | |
222 | Status = EFI_INVALID_PARAMETER;\r | |
223 | goto FreeMapInfo;\r | |
f9d129e6 BS |
224 | }\r |
225 | \r | |
25201821 MX |
226 | if (CC_GUEST_IS_SEV (PcdGet64 (PcdConfidentialComputingGuestAttr))) {\r |
227 | //\r | |
228 | // Clear the memory encryption mask on the plaintext buffer.\r | |
229 | //\r | |
230 | Status = MemEncryptSevClearPageEncMask (\r | |
231 | 0,\r | |
232 | MapInfo->PlainTextAddress,\r | |
233 | MapInfo->NumberOfPages\r | |
234 | );\r | |
235 | } else if (CC_GUEST_IS_TDX (PcdGet64 (PcdConfidentialComputingGuestAttr))) {\r | |
236 | //\r | |
237 | // Set the memory shared bit.\r | |
c4e76d2f MX |
238 | // If MapInfo->ReservedMemBitmap is 0, it means the bounce buffer is not allocated\r |
239 | // from the pre-allocated shared memory, so it must be converted to shared memory here.\r | |
25201821 | 240 | //\r |
c4e76d2f MX |
241 | if (MapInfo->ReservedMemBitmap == 0) {\r |
242 | Status = MemEncryptTdxSetPageSharedBit (\r | |
243 | 0,\r | |
244 | MapInfo->PlainTextAddress,\r | |
245 | MapInfo->NumberOfPages\r | |
246 | );\r | |
247 | }\r | |
25201821 MX |
248 | } else {\r |
249 | ASSERT (FALSE);\r | |
250 | }\r | |
251 | \r | |
f1658838 LE |
252 | ASSERT_EFI_ERROR (Status);\r |
253 | if (EFI_ERROR (Status)) {\r | |
254 | CpuDeadLoop ();\r | |
255 | }\r | |
f9d129e6 BS |
256 | \r |
257 | //\r | |
258 | // If this is a read operation from the Bus Master's point of view,\r | |
259 | // then copy the contents of the real buffer into the mapped buffer\r | |
260 | // so the Bus Master can read the contents of the real buffer.\r | |
261 | //\r | |
58e68140 LE |
262 | // For BusMasterCommonBuffer[64] operations, the CopyMem() below will decrypt\r |
263 | // the original data (from the stash buffer) back to the original location.\r | |
264 | //\r | |
ac0a286f MK |
265 | if ((Operation == EdkiiIoMmuOperationBusMasterRead) ||\r |
266 | (Operation == EdkiiIoMmuOperationBusMasterRead64) ||\r | |
267 | (Operation == EdkiiIoMmuOperationBusMasterCommonBuffer) ||\r | |
268 | (Operation == EdkiiIoMmuOperationBusMasterCommonBuffer64))\r | |
269 | {\r | |
f9d129e6 | 270 | CopyMem (\r |
ac0a286f | 271 | (VOID *)(UINTN)MapInfo->PlainTextAddress,\r |
58e68140 | 272 | DecryptionSource,\r |
f9d129e6 BS |
273 | MapInfo->NumberOfBytes\r |
274 | );\r | |
275 | }\r | |
276 | \r | |
9ed745b9 LE |
277 | //\r |
278 | // Track all MAP_INFO structures.\r | |
279 | //\r | |
280 | InsertHeadList (&mMapInfos, &MapInfo->Link);\r | |
f9d129e6 | 281 | //\r |
e130229c | 282 | // Populate output parameters.\r |
f9d129e6 | 283 | //\r |
dc194ce3 | 284 | *DeviceAddress = MapInfo->PlainTextAddress;\r |
f9d129e6 BS |
285 | *Mapping = MapInfo;\r |
286 | \r | |
812568fb LE |
287 | DEBUG ((\r |
288 | DEBUG_VERBOSE,\r | |
c4e76d2f | 289 | "%a: Mapping=0x%p Device(PlainText)=0x%Lx Crypted=0x%Lx Pages=0x%Lx, ReservedMemBitmap=0x%Lx\n",\r |
812568fb | 290 | __FUNCTION__,\r |
2ad6ba80 | 291 | MapInfo,\r |
dc194ce3 | 292 | MapInfo->PlainTextAddress,\r |
c7ef2ed2 | 293 | MapInfo->CryptedAddress,\r |
c4e76d2f MX |
294 | (UINT64)MapInfo->NumberOfPages,\r |
295 | MapInfo->ReservedMemBitmap\r | |
812568fb | 296 | ));\r |
f9d129e6 BS |
297 | \r |
298 | return EFI_SUCCESS;\r | |
e130229c LE |
299 | \r |
300 | FreeMapInfo:\r | |
301 | FreePool (MapInfo);\r | |
302 | \r | |
303 | Failed:\r | |
304 | *NumberOfBytes = 0;\r | |
305 | return Status;\r | |
f9d129e6 BS |
306 | }\r |
307 | \r | |
308 | /**\r | |
309 | Completes the Map() operation and releases any corresponding resources.\r | |
310 | \r | |
550acd08 LE |
311 | This is an internal worker function that only extends the Map() API with\r |
312 | the MemoryMapLocked parameter.\r | |
313 | \r | |
f9d129e6 BS |
314 | @param This The protocol instance pointer.\r |
315 | @param Mapping The mapping value returned from Map().\r | |
550acd08 LE |
316 | @param MemoryMapLocked The function is executing on the stack of\r |
317 | gBS->ExitBootServices(); changes to the UEFI\r | |
318 | memory map are forbidden.\r | |
f9d129e6 BS |
319 | \r |
320 | @retval EFI_SUCCESS The range was unmapped.\r | |
812568fb LE |
321 | @retval EFI_INVALID_PARAMETER Mapping is not a value that was returned by\r |
322 | Map().\r | |
323 | @retval EFI_DEVICE_ERROR The data was not committed to the target system\r | |
324 | memory.\r | |
f9d129e6 | 325 | **/\r |
550acd08 | 326 | STATIC\r |
f9d129e6 BS |
327 | EFI_STATUS\r |
328 | EFIAPI\r | |
550acd08 | 329 | IoMmuUnmapWorker (\r |
ac0a286f MK |
330 | IN EDKII_IOMMU_PROTOCOL *This,\r |
331 | IN VOID *Mapping,\r | |
332 | IN BOOLEAN MemoryMapLocked\r | |
f9d129e6 BS |
333 | )\r |
334 | {\r | |
ac0a286f MK |
335 | MAP_INFO *MapInfo;\r |
336 | EFI_STATUS Status;\r | |
337 | COMMON_BUFFER_HEADER *CommonBufferHeader;\r | |
338 | VOID *EncryptionTarget;\r | |
f9d129e6 | 339 | \r |
550acd08 LE |
340 | DEBUG ((\r |
341 | DEBUG_VERBOSE,\r | |
342 | "%a: Mapping=0x%p MemoryMapLocked=%d\n",\r | |
343 | __FUNCTION__,\r | |
344 | Mapping,\r | |
345 | MemoryMapLocked\r | |
346 | ));\r | |
a1d6a9dc | 347 | \r |
f9d129e6 BS |
348 | if (Mapping == NULL) {\r |
349 | return EFI_INVALID_PARAMETER;\r | |
350 | }\r | |
351 | \r | |
58e68140 | 352 | MapInfo = (MAP_INFO *)Mapping;\r |
25201821 | 353 | Status = EFI_SUCCESS;\r |
f9d129e6 | 354 | //\r |
58e68140 | 355 | // set CommonBufferHeader to suppress incorrect compiler/analyzer warnings\r |
f9d129e6 | 356 | //\r |
58e68140 | 357 | CommonBufferHeader = NULL;\r |
f9d129e6 BS |
358 | \r |
359 | //\r | |
58e68140 LE |
360 | // For BusMasterWrite[64] operations and BusMasterCommonBuffer[64] operations\r |
361 | // we have to encrypt the results, ultimately to the original place (i.e.,\r | |
362 | // "MapInfo->CryptedAddress").\r | |
f9d129e6 | 363 | //\r |
58e68140 LE |
364 | // For BusMasterCommonBuffer[64] operations however, this encryption has to\r |
365 | // land in-place, so divert the encryption to the stash buffer first.\r | |
366 | //\r | |
367 | EncryptionTarget = (VOID *)(UINTN)MapInfo->CryptedAddress;\r | |
368 | \r | |
369 | switch (MapInfo->Operation) {\r | |
ac0a286f MK |
370 | case EdkiiIoMmuOperationBusMasterCommonBuffer:\r |
371 | case EdkiiIoMmuOperationBusMasterCommonBuffer64:\r | |
372 | ASSERT (MapInfo->PlainTextAddress == MapInfo->CryptedAddress);\r | |
373 | \r | |
374 | CommonBufferHeader = (COMMON_BUFFER_HEADER *)(\r | |
375 | (UINTN)MapInfo->PlainTextAddress - EFI_PAGE_SIZE\r | |
376 | );\r | |
377 | ASSERT (CommonBufferHeader->Signature == COMMON_BUFFER_SIG);\r | |
378 | EncryptionTarget = CommonBufferHeader->StashBuffer;\r | |
58e68140 LE |
379 | //\r |
380 | // fall through\r | |
381 | //\r | |
382 | \r | |
ac0a286f MK |
383 | case EdkiiIoMmuOperationBusMasterWrite:\r |
384 | case EdkiiIoMmuOperationBusMasterWrite64:\r | |
385 | CopyMem (\r | |
386 | EncryptionTarget,\r | |
387 | (VOID *)(UINTN)MapInfo->PlainTextAddress,\r | |
388 | MapInfo->NumberOfBytes\r | |
389 | );\r | |
390 | break;\r | |
58e68140 | 391 | \r |
ac0a286f MK |
392 | default:\r |
393 | //\r | |
394 | // nothing to encrypt after BusMasterRead[64] operations\r | |
395 | //\r | |
396 | break;\r | |
f9d129e6 BS |
397 | }\r |
398 | \r | |
25201821 MX |
399 | if (CC_GUEST_IS_SEV (PcdGet64 (PcdConfidentialComputingGuestAttr))) {\r |
400 | //\r | |
401 | // Restore the memory encryption mask on the area we used to hold the\r | |
402 | // plaintext.\r | |
403 | //\r | |
404 | Status = MemEncryptSevSetPageEncMask (\r | |
405 | 0,\r | |
406 | MapInfo->PlainTextAddress,\r | |
407 | MapInfo->NumberOfPages\r | |
408 | );\r | |
409 | } else if (CC_GUEST_IS_TDX (PcdGet64 (PcdConfidentialComputingGuestAttr))) {\r | |
410 | //\r | |
411 | // Restore the memory shared bit mask on the area we used to hold the\r | |
412 | // plaintext.\r | |
413 | //\r | |
c4e76d2f MX |
414 | if (MapInfo->ReservedMemBitmap == 0) {\r |
415 | Status = MemEncryptTdxClearPageSharedBit (\r | |
416 | 0,\r | |
417 | MapInfo->PlainTextAddress,\r | |
418 | MapInfo->NumberOfPages\r | |
419 | );\r | |
420 | }\r | |
25201821 MX |
421 | } else {\r |
422 | ASSERT (FALSE);\r | |
423 | }\r | |
424 | \r | |
f1658838 LE |
425 | ASSERT_EFI_ERROR (Status);\r |
426 | if (EFI_ERROR (Status)) {\r | |
427 | CpuDeadLoop ();\r | |
428 | }\r | |
f9d129e6 BS |
429 | \r |
430 | //\r | |
58e68140 LE |
431 | // For BusMasterCommonBuffer[64] operations, copy the stashed data to the\r |
432 | // original (now encrypted) location.\r | |
433 | //\r | |
434 | // For all other operations, fill the late bounce buffer (which existed as\r | |
550acd08 LE |
435 | // plaintext at some point) with zeros, and then release it (unless the UEFI\r |
436 | // memory map is locked).\r | |
58e68140 | 437 | //\r |
ac0a286f MK |
438 | if ((MapInfo->Operation == EdkiiIoMmuOperationBusMasterCommonBuffer) ||\r |
439 | (MapInfo->Operation == EdkiiIoMmuOperationBusMasterCommonBuffer64))\r | |
440 | {\r | |
58e68140 LE |
441 | CopyMem (\r |
442 | (VOID *)(UINTN)MapInfo->CryptedAddress,\r | |
443 | CommonBufferHeader->StashBuffer,\r | |
444 | MapInfo->NumberOfBytes\r | |
445 | );\r | |
446 | } else {\r | |
447 | ZeroMem (\r | |
448 | (VOID *)(UINTN)MapInfo->PlainTextAddress,\r | |
449 | EFI_PAGES_TO_SIZE (MapInfo->NumberOfPages)\r | |
450 | );\r | |
c4e76d2f | 451 | \r |
550acd08 | 452 | if (!MemoryMapLocked) {\r |
c4e76d2f | 453 | IoMmuFreeBounceBuffer (MapInfo);\r |
550acd08 | 454 | }\r |
58e68140 LE |
455 | }\r |
456 | \r | |
9ed745b9 | 457 | //\r |
550acd08 LE |
458 | // Forget the MAP_INFO structure, then free it (unless the UEFI memory map is\r |
459 | // locked).\r | |
9ed745b9 LE |
460 | //\r |
461 | RemoveEntryList (&MapInfo->Link);\r | |
550acd08 LE |
462 | if (!MemoryMapLocked) {\r |
463 | FreePool (MapInfo);\r | |
464 | }\r | |
9ed745b9 | 465 | \r |
f9d129e6 BS |
466 | return EFI_SUCCESS;\r |
467 | }\r | |
468 | \r | |
550acd08 LE |
469 | /**\r |
470 | Completes the Map() operation and releases any corresponding resources.\r | |
471 | \r | |
472 | @param This The protocol instance pointer.\r | |
473 | @param Mapping The mapping value returned from Map().\r | |
474 | \r | |
475 | @retval EFI_SUCCESS The range was unmapped.\r | |
476 | @retval EFI_INVALID_PARAMETER Mapping is not a value that was returned by\r | |
477 | Map().\r | |
478 | @retval EFI_DEVICE_ERROR The data was not committed to the target system\r | |
479 | memory.\r | |
480 | **/\r | |
481 | EFI_STATUS\r | |
482 | EFIAPI\r | |
483 | IoMmuUnmap (\r | |
ac0a286f MK |
484 | IN EDKII_IOMMU_PROTOCOL *This,\r |
485 | IN VOID *Mapping\r | |
550acd08 LE |
486 | )\r |
487 | {\r | |
488 | return IoMmuUnmapWorker (\r | |
489 | This,\r | |
490 | Mapping,\r | |
491 | FALSE // MemoryMapLocked\r | |
492 | );\r | |
493 | }\r | |
494 | \r | |
f9d129e6 BS |
495 | /**\r |
496 | Allocates pages that are suitable for an OperationBusMasterCommonBuffer or\r | |
497 | OperationBusMasterCommonBuffer64 mapping.\r | |
498 | \r | |
499 | @param This The protocol instance pointer.\r | |
500 | @param Type This parameter is not used and must be ignored.\r | |
812568fb LE |
501 | @param MemoryType The type of memory to allocate,\r |
502 | EfiBootServicesData or EfiRuntimeServicesData.\r | |
f9d129e6 | 503 | @param Pages The number of pages to allocate.\r |
812568fb LE |
504 | @param HostAddress A pointer to store the base system memory\r |
505 | address of the allocated range.\r | |
506 | @param Attributes The requested bit mask of attributes for the\r | |
507 | allocated range.\r | |
f9d129e6 BS |
508 | \r |
509 | @retval EFI_SUCCESS The requested memory pages were allocated.\r | |
812568fb LE |
510 | @retval EFI_UNSUPPORTED Attributes is unsupported. The only legal\r |
511 | attribute bits are MEMORY_WRITE_COMBINE and\r | |
512 | MEMORY_CACHED.\r | |
f9d129e6 BS |
513 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r |
514 | @retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.\r | |
515 | \r | |
516 | **/\r | |
517 | EFI_STATUS\r | |
518 | EFIAPI\r | |
519 | IoMmuAllocateBuffer (\r | |
ac0a286f MK |
520 | IN EDKII_IOMMU_PROTOCOL *This,\r |
521 | IN EFI_ALLOCATE_TYPE Type,\r | |
522 | IN EFI_MEMORY_TYPE MemoryType,\r | |
523 | IN UINTN Pages,\r | |
524 | IN OUT VOID **HostAddress,\r | |
525 | IN UINT64 Attributes\r | |
f9d129e6 BS |
526 | )\r |
527 | {\r | |
ac0a286f MK |
528 | EFI_STATUS Status;\r |
529 | EFI_PHYSICAL_ADDRESS PhysicalAddress;\r | |
530 | VOID *StashBuffer;\r | |
531 | UINTN CommonBufferPages;\r | |
532 | COMMON_BUFFER_HEADER *CommonBufferHeader;\r | |
c4e76d2f | 533 | UINT32 ReservedMemBitmap;\r |
f9d129e6 | 534 | \r |
80ddd336 LE |
535 | DEBUG ((\r |
536 | DEBUG_VERBOSE,\r | |
537 | "%a: MemoryType=%u Pages=0x%Lx Attributes=0x%Lx\n",\r | |
538 | __FUNCTION__,\r | |
539 | (UINT32)MemoryType,\r | |
540 | (UINT64)Pages,\r | |
541 | Attributes\r | |
542 | ));\r | |
543 | \r | |
f9d129e6 BS |
544 | //\r |
545 | // Validate Attributes\r | |
546 | //\r | |
547 | if ((Attributes & EDKII_IOMMU_ATTRIBUTE_INVALID_FOR_ALLOCATE_BUFFER) != 0) {\r | |
548 | return EFI_UNSUPPORTED;\r | |
549 | }\r | |
550 | \r | |
551 | //\r | |
552 | // Check for invalid inputs\r | |
553 | //\r | |
554 | if (HostAddress == NULL) {\r | |
555 | return EFI_INVALID_PARAMETER;\r | |
556 | }\r | |
557 | \r | |
558 | //\r | |
559 | // The only valid memory types are EfiBootServicesData and\r | |
560 | // EfiRuntimeServicesData\r | |
561 | //\r | |
ac0a286f MK |
562 | if ((MemoryType != EfiBootServicesData) &&\r |
563 | (MemoryType != EfiRuntimeServicesData))\r | |
564 | {\r | |
f9d129e6 BS |
565 | return EFI_INVALID_PARAMETER;\r |
566 | }\r | |
567 | \r | |
58e68140 LE |
568 | //\r |
569 | // We'll need a header page for the COMMON_BUFFER_HEADER structure.\r | |
570 | //\r | |
571 | if (Pages > MAX_UINTN - 1) {\r | |
572 | return EFI_OUT_OF_RESOURCES;\r | |
573 | }\r | |
ac0a286f | 574 | \r |
58e68140 LE |
575 | CommonBufferPages = Pages + 1;\r |
576 | \r | |
577 | //\r | |
578 | // Allocate the stash in EfiBootServicesData type memory.\r | |
579 | //\r | |
580 | // Map() will temporarily save encrypted data in the stash for\r | |
581 | // BusMasterCommonBuffer[64] operations, so the data can be decrypted to the\r | |
582 | // original location.\r | |
583 | //\r | |
584 | // Unmap() will temporarily save plaintext data in the stash for\r | |
585 | // BusMasterCommonBuffer[64] operations, so the data can be encrypted to the\r | |
586 | // original location.\r | |
587 | //\r | |
588 | // StashBuffer always resides in encrypted memory.\r | |
589 | //\r | |
590 | StashBuffer = AllocatePages (Pages);\r | |
591 | if (StashBuffer == NULL) {\r | |
592 | return EFI_OUT_OF_RESOURCES;\r | |
593 | }\r | |
594 | \r | |
f9d129e6 BS |
595 | PhysicalAddress = (UINTN)-1;\r |
596 | if ((Attributes & EDKII_IOMMU_ATTRIBUTE_DUAL_ADDRESS_CYCLE) == 0) {\r | |
597 | //\r | |
598 | // Limit allocations to memory below 4GB\r | |
599 | //\r | |
600 | PhysicalAddress = SIZE_4GB - 1;\r | |
601 | }\r | |
ac0a286f | 602 | \r |
c4e76d2f MX |
603 | Status = IoMmuAllocateCommonBuffer (\r |
604 | MemoryType,\r | |
605 | CommonBufferPages,\r | |
606 | &PhysicalAddress,\r | |
607 | &ReservedMemBitmap\r | |
608 | );\r | |
609 | \r | |
58e68140 LE |
610 | if (EFI_ERROR (Status)) {\r |
611 | goto FreeStashBuffer;\r | |
f9d129e6 BS |
612 | }\r |
613 | \r | |
58e68140 | 614 | CommonBufferHeader = (VOID *)(UINTN)PhysicalAddress;\r |
ac0a286f | 615 | PhysicalAddress += EFI_PAGE_SIZE;\r |
58e68140 | 616 | \r |
c4e76d2f MX |
617 | CommonBufferHeader->Signature = COMMON_BUFFER_SIG;\r |
618 | CommonBufferHeader->StashBuffer = StashBuffer;\r | |
619 | CommonBufferHeader->ReservedMemBitmap = ReservedMemBitmap;\r | |
58e68140 LE |
620 | \r |
621 | *HostAddress = (VOID *)(UINTN)PhysicalAddress;\r | |
622 | \r | |
812568fb LE |
623 | DEBUG ((\r |
624 | DEBUG_VERBOSE,\r | |
80ddd336 | 625 | "%a: Host=0x%Lx Stash=0x%p\n",\r |
812568fb LE |
626 | __FUNCTION__,\r |
627 | PhysicalAddress,\r | |
80ddd336 | 628 | StashBuffer\r |
812568fb | 629 | ));\r |
58e68140 LE |
630 | return EFI_SUCCESS;\r |
631 | \r | |
632 | FreeStashBuffer:\r | |
633 | FreePages (StashBuffer, Pages);\r | |
f9d129e6 BS |
634 | return Status;\r |
635 | }\r | |
636 | \r | |
637 | /**\r | |
638 | Frees memory that was allocated with AllocateBuffer().\r | |
639 | \r | |
640 | @param This The protocol instance pointer.\r | |
641 | @param Pages The number of pages to free.\r | |
812568fb LE |
642 | @param HostAddress The base system memory address of the allocated\r |
643 | range.\r | |
f9d129e6 BS |
644 | \r |
645 | @retval EFI_SUCCESS The requested memory pages were freed.\r | |
812568fb LE |
646 | @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and\r |
647 | Pages was not allocated with AllocateBuffer().\r | |
f9d129e6 BS |
648 | \r |
649 | **/\r | |
650 | EFI_STATUS\r | |
651 | EFIAPI\r | |
652 | IoMmuFreeBuffer (\r | |
ac0a286f MK |
653 | IN EDKII_IOMMU_PROTOCOL *This,\r |
654 | IN UINTN Pages,\r | |
655 | IN VOID *HostAddress\r | |
f9d129e6 BS |
656 | )\r |
657 | {\r | |
ac0a286f MK |
658 | UINTN CommonBufferPages;\r |
659 | COMMON_BUFFER_HEADER *CommonBufferHeader;\r | |
58e68140 | 660 | \r |
1afbb85f LE |
661 | DEBUG ((\r |
662 | DEBUG_VERBOSE,\r | |
663 | "%a: Host=0x%p Pages=0x%Lx\n",\r | |
664 | __FUNCTION__,\r | |
665 | HostAddress,\r | |
666 | (UINT64)Pages\r | |
667 | ));\r | |
668 | \r | |
ac0a286f | 669 | CommonBufferPages = Pages + 1;\r |
58e68140 | 670 | CommonBufferHeader = (COMMON_BUFFER_HEADER *)(\r |
ac0a286f MK |
671 | (UINTN)HostAddress - EFI_PAGE_SIZE\r |
672 | );\r | |
f9d129e6 BS |
673 | \r |
674 | //\r | |
58e68140 | 675 | // Check the signature.\r |
f9d129e6 | 676 | //\r |
58e68140 LE |
677 | ASSERT (CommonBufferHeader->Signature == COMMON_BUFFER_SIG);\r |
678 | if (CommonBufferHeader->Signature != COMMON_BUFFER_SIG) {\r | |
679 | return EFI_INVALID_PARAMETER;\r | |
680 | }\r | |
681 | \r | |
682 | //\r | |
683 | // Free the stash buffer. This buffer was always encrypted, so no need to\r | |
684 | // zero it.\r | |
685 | //\r | |
686 | FreePages (CommonBufferHeader->StashBuffer, Pages);\r | |
f9d129e6 | 687 | \r |
58e68140 LE |
688 | //\r |
689 | // Release the common buffer itself. Unmap() has re-encrypted it in-place, so\r | |
690 | // no need to zero it.\r | |
691 | //\r | |
c4e76d2f | 692 | return IoMmuFreeCommonBuffer (CommonBufferHeader, CommonBufferPages);\r |
f9d129e6 BS |
693 | }\r |
694 | \r | |
f9d129e6 BS |
695 | /**\r |
696 | Set IOMMU attribute for a system memory.\r | |
697 | \r | |
698 | If the IOMMU protocol exists, the system memory cannot be used\r | |
699 | for DMA by default.\r | |
700 | \r | |
701 | When a device requests a DMA access for a system memory,\r | |
702 | the device driver need use SetAttribute() to update the IOMMU\r | |
703 | attribute to request DMA access (read and/or write).\r | |
704 | \r | |
705 | The DeviceHandle is used to identify which device submits the request.\r | |
812568fb LE |
706 | The IOMMU implementation need translate the device path to an IOMMU device\r |
707 | ID, and set IOMMU hardware register accordingly.\r | |
f9d129e6 BS |
708 | 1) DeviceHandle can be a standard PCI device.\r |
709 | The memory for BusMasterRead need set EDKII_IOMMU_ACCESS_READ.\r | |
710 | The memory for BusMasterWrite need set EDKII_IOMMU_ACCESS_WRITE.\r | |
812568fb LE |
711 | The memory for BusMasterCommonBuffer need set\r |
712 | EDKII_IOMMU_ACCESS_READ|EDKII_IOMMU_ACCESS_WRITE.\r | |
713 | After the memory is used, the memory need set 0 to keep it being\r | |
714 | protected.\r | |
f9d129e6 | 715 | 2) DeviceHandle can be an ACPI device (ISA, I2C, SPI, etc).\r |
812568fb LE |
716 | The memory for DMA access need set EDKII_IOMMU_ACCESS_READ and/or\r |
717 | EDKII_IOMMU_ACCESS_WRITE.\r | |
f9d129e6 BS |
718 | \r |
719 | @param[in] This The protocol instance pointer.\r | |
812568fb LE |
720 | @param[in] DeviceHandle The device who initiates the DMA access\r |
721 | request.\r | |
f9d129e6 BS |
722 | @param[in] Mapping The mapping value returned from Map().\r |
723 | @param[in] IoMmuAccess The IOMMU access.\r | |
724 | \r | |
812568fb LE |
725 | @retval EFI_SUCCESS The IoMmuAccess is set for the memory range\r |
726 | specified by DeviceAddress and Length.\r | |
f9d129e6 | 727 | @retval EFI_INVALID_PARAMETER DeviceHandle is an invalid handle.\r |
812568fb LE |
728 | @retval EFI_INVALID_PARAMETER Mapping is not a value that was returned by\r |
729 | Map().\r | |
730 | @retval EFI_INVALID_PARAMETER IoMmuAccess specified an illegal combination\r | |
731 | of access.\r | |
f9d129e6 | 732 | @retval EFI_UNSUPPORTED DeviceHandle is unknown by the IOMMU.\r |
812568fb LE |
733 | @retval EFI_UNSUPPORTED The bit mask of IoMmuAccess is not supported\r |
734 | by the IOMMU.\r | |
735 | @retval EFI_UNSUPPORTED The IOMMU does not support the memory range\r | |
736 | specified by Mapping.\r | |
737 | @retval EFI_OUT_OF_RESOURCES There are not enough resources available to\r | |
738 | modify the IOMMU access.\r | |
739 | @retval EFI_DEVICE_ERROR The IOMMU device reported an error while\r | |
740 | attempting the operation.\r | |
f9d129e6 BS |
741 | \r |
742 | **/\r | |
743 | EFI_STATUS\r | |
744 | EFIAPI\r | |
745 | IoMmuSetAttribute (\r | |
746 | IN EDKII_IOMMU_PROTOCOL *This,\r | |
747 | IN EFI_HANDLE DeviceHandle,\r | |
748 | IN VOID *Mapping,\r | |
749 | IN UINT64 IoMmuAccess\r | |
750 | )\r | |
751 | {\r | |
752 | return EFI_UNSUPPORTED;\r | |
753 | }\r | |
754 | \r | |
25201821 | 755 | EDKII_IOMMU_PROTOCOL mIoMmu = {\r |
f9d129e6 BS |
756 | EDKII_IOMMU_PROTOCOL_REVISION,\r |
757 | IoMmuSetAttribute,\r | |
758 | IoMmuMap,\r | |
759 | IoMmuUnmap,\r | |
760 | IoMmuAllocateBuffer,\r | |
761 | IoMmuFreeBuffer,\r | |
762 | };\r | |
763 | \r | |
7aee391f LE |
764 | /**\r |
765 | Notification function that is queued when gBS->ExitBootServices() signals the\r | |
766 | EFI_EVENT_GROUP_EXIT_BOOT_SERVICES event group. This function signals another\r | |
767 | event, received as Context, and returns.\r | |
768 | \r | |
769 | Signaling an event in this context is safe. The UEFI spec allows\r | |
770 | gBS->SignalEvent() to return EFI_SUCCESS only; EFI_OUT_OF_RESOURCES is not\r | |
771 | listed, hence memory is not allocated. The edk2 implementation also does not\r | |
772 | release memory (and we only have to care about the edk2 implementation\r | |
773 | because EDKII_IOMMU_PROTOCOL is edk2-specific anyway).\r | |
774 | \r | |
775 | @param[in] Event Event whose notification function is being invoked.\r | |
776 | Event is permitted to request the queueing of this\r | |
777 | function at TPL_CALLBACK or TPL_NOTIFY task\r | |
778 | priority level.\r | |
779 | \r | |
780 | @param[in] EventToSignal Identifies the EFI_EVENT to signal. EventToSignal\r | |
781 | is permitted to request the queueing of its\r | |
782 | notification function only at TPL_CALLBACK level.\r | |
783 | **/\r | |
784 | STATIC\r | |
785 | VOID\r | |
786 | EFIAPI\r | |
25201821 | 787 | IoMmuExitBoot (\r |
ac0a286f MK |
788 | IN EFI_EVENT Event,\r |
789 | IN VOID *EventToSignal\r | |
7aee391f LE |
790 | )\r |
791 | {\r | |
792 | //\r | |
793 | // (1) The NotifyFunctions of all the events in\r | |
794 | // EFI_EVENT_GROUP_EXIT_BOOT_SERVICES will have been queued before\r | |
25201821 | 795 | // IoMmuExitBoot() is entered.\r |
7aee391f | 796 | //\r |
25201821 | 797 | // (2) IoMmuExitBoot() is executing minimally at TPL_CALLBACK.\r |
7aee391f | 798 | //\r |
25201821 | 799 | // (3) IoMmuExitBoot() has been queued in unspecified order relative to the\r |
7aee391f LE |
800 | // NotifyFunctions of all the other events in\r |
801 | // EFI_EVENT_GROUP_EXIT_BOOT_SERVICES whose NotifyTpl is the same as\r | |
802 | // Event's.\r | |
803 | //\r | |
804 | // Consequences:\r | |
805 | //\r | |
806 | // - If Event's NotifyTpl is TPL_CALLBACK, then some other NotifyFunctions\r | |
25201821 | 807 | // queued at TPL_CALLBACK may be invoked after IoMmuExitBoot() returns.\r |
7aee391f LE |
808 | //\r |
809 | // - If Event's NotifyTpl is TPL_NOTIFY, then some other NotifyFunctions\r | |
25201821 | 810 | // queued at TPL_NOTIFY may be invoked after IoMmuExitBoot() returns; plus\r |
7aee391f LE |
811 | // *all* NotifyFunctions queued at TPL_CALLBACK will be invoked strictly\r |
812 | // after all NotifyFunctions queued at TPL_NOTIFY, including\r | |
25201821 | 813 | // IoMmuExitBoot(), have been invoked.\r |
7aee391f LE |
814 | //\r |
815 | // - By signaling EventToSignal here, whose NotifyTpl is TPL_CALLBACK, we\r | |
816 | // queue EventToSignal's NotifyFunction after the NotifyFunctions of *all*\r | |
817 | // events in EFI_EVENT_GROUP_EXIT_BOOT_SERVICES.\r | |
818 | //\r | |
819 | DEBUG ((DEBUG_VERBOSE, "%a\n", __FUNCTION__));\r | |
820 | gBS->SignalEvent (EventToSignal);\r | |
821 | }\r | |
822 | \r | |
823 | /**\r | |
824 | Notification function that is queued after the notification functions of all\r | |
825 | events in the EFI_EVENT_GROUP_EXIT_BOOT_SERVICES event group. The same memory\r | |
826 | map restrictions apply.\r | |
827 | \r | |
828 | This function unmaps all currently existing IOMMU mappings.\r | |
829 | \r | |
830 | @param[in] Event Event whose notification function is being invoked. Event\r | |
831 | is permitted to request the queueing of this function\r | |
832 | only at TPL_CALLBACK task priority level.\r | |
833 | \r | |
834 | @param[in] Context Ignored.\r | |
835 | **/\r | |
836 | STATIC\r | |
837 | VOID\r | |
838 | EFIAPI\r | |
25201821 | 839 | IoMmuUnmapAllMappings (\r |
ac0a286f MK |
840 | IN EFI_EVENT Event,\r |
841 | IN VOID *Context\r | |
7aee391f LE |
842 | )\r |
843 | {\r | |
ac0a286f MK |
844 | LIST_ENTRY *Node;\r |
845 | LIST_ENTRY *NextNode;\r | |
846 | MAP_INFO *MapInfo;\r | |
7aee391f LE |
847 | \r |
848 | DEBUG ((DEBUG_VERBOSE, "%a\n", __FUNCTION__));\r | |
849 | \r | |
850 | //\r | |
851 | // All drivers that had set up IOMMU mappings have halted their respective\r | |
852 | // controllers by now; tear down the mappings.\r | |
853 | //\r | |
854 | for (Node = GetFirstNode (&mMapInfos); Node != &mMapInfos; Node = NextNode) {\r | |
855 | NextNode = GetNextNode (&mMapInfos, Node);\r | |
ac0a286f | 856 | MapInfo = CR (Node, MAP_INFO, Link, MAP_INFO_SIG);\r |
7aee391f | 857 | IoMmuUnmapWorker (\r |
25201821 | 858 | &mIoMmu, // This\r |
7aee391f LE |
859 | MapInfo, // Mapping\r |
860 | TRUE // MemoryMapLocked\r | |
861 | );\r | |
862 | }\r | |
c4e76d2f MX |
863 | \r |
864 | //\r | |
865 | // Release the reserved shared memory as well.\r | |
866 | //\r | |
867 | IoMmuReleaseReservedSharedMem (TRUE);\r | |
7aee391f LE |
868 | }\r |
869 | \r | |
f9d129e6 BS |
870 | /**\r |
871 | Initialize Iommu Protocol.\r | |
872 | \r | |
873 | **/\r | |
db125079 | 874 | EFI_STATUS\r |
f9d129e6 | 875 | EFIAPI\r |
25201821 | 876 | InstallIoMmuProtocol (\r |
f9d129e6 BS |
877 | VOID\r |
878 | )\r | |
879 | {\r | |
880 | EFI_STATUS Status;\r | |
7aee391f LE |
881 | EFI_EVENT UnmapAllMappingsEvent;\r |
882 | EFI_EVENT ExitBootEvent;\r | |
f9d129e6 BS |
883 | EFI_HANDLE Handle;\r |
884 | \r | |
7aee391f LE |
885 | //\r |
886 | // Create the "late" event whose notification function will tear down all\r | |
887 | // left-over IOMMU mappings.\r | |
888 | //\r | |
889 | Status = gBS->CreateEvent (\r | |
890 | EVT_NOTIFY_SIGNAL, // Type\r | |
891 | TPL_CALLBACK, // NotifyTpl\r | |
25201821 | 892 | IoMmuUnmapAllMappings, // NotifyFunction\r |
7aee391f LE |
893 | NULL, // NotifyContext\r |
894 | &UnmapAllMappingsEvent // Event\r | |
895 | );\r | |
896 | if (EFI_ERROR (Status)) {\r | |
897 | return Status;\r | |
898 | }\r | |
899 | \r | |
900 | //\r | |
901 | // Create the event whose notification function will be queued by\r | |
902 | // gBS->ExitBootServices() and will signal the event created above.\r | |
903 | //\r | |
904 | Status = gBS->CreateEvent (\r | |
905 | EVT_SIGNAL_EXIT_BOOT_SERVICES, // Type\r | |
906 | TPL_CALLBACK, // NotifyTpl\r | |
25201821 | 907 | IoMmuExitBoot, // NotifyFunction\r |
7aee391f LE |
908 | UnmapAllMappingsEvent, // NotifyContext\r |
909 | &ExitBootEvent // Event\r | |
910 | );\r | |
911 | if (EFI_ERROR (Status)) {\r | |
912 | goto CloseUnmapAllMappingsEvent;\r | |
913 | }\r | |
914 | \r | |
f9d129e6 BS |
915 | Handle = NULL;\r |
916 | Status = gBS->InstallMultipleProtocolInterfaces (\r | |
917 | &Handle,\r | |
ac0a286f | 918 | &gEdkiiIoMmuProtocolGuid,\r |
25201821 | 919 | &mIoMmu,\r |
f9d129e6 BS |
920 | NULL\r |
921 | );\r | |
7aee391f LE |
922 | if (EFI_ERROR (Status)) {\r |
923 | goto CloseExitBootEvent;\r | |
924 | }\r | |
925 | \r | |
c4e76d2f MX |
926 | //\r |
927 | // Currently only Tdx guest support Reserved shared memory for DMA operation.\r | |
928 | //\r | |
929 | if (CC_GUEST_IS_TDX (PcdGet64 (PcdConfidentialComputingGuestAttr))) {\r | |
930 | mReservedSharedMemSupported = TRUE;\r | |
931 | Status = IoMmuInitReservedSharedMem ();\r | |
932 | if (EFI_ERROR (Status)) {\r | |
933 | mReservedSharedMemSupported = FALSE;\r | |
934 | } else {\r | |
935 | DEBUG ((DEBUG_INFO, "%a: Feature of reserved memory for DMA is supported.\n", __FUNCTION__));\r | |
936 | }\r | |
937 | }\r | |
938 | \r | |
7aee391f LE |
939 | return EFI_SUCCESS;\r |
940 | \r | |
941 | CloseExitBootEvent:\r | |
942 | gBS->CloseEvent (ExitBootEvent);\r | |
943 | \r | |
944 | CloseUnmapAllMappingsEvent:\r | |
945 | gBS->CloseEvent (UnmapAllMappingsEvent);\r | |
946 | \r | |
db125079 | 947 | return Status;\r |
f9d129e6 | 948 | }\r |