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723102c7 AB |
1 | /** @file\r |
2 | \r | |
3 | Generic non-coherent implementation of DmaLib.h\r | |
4 | \r | |
5 | Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r | |
6 | Copyright (c) 2015 - 2017, Linaro, Ltd. All rights reserved.<BR>\r | |
7 | \r | |
878b807a | 8 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
723102c7 AB |
9 | \r |
10 | **/\r | |
11 | \r | |
12 | #include <PiDxe.h>\r | |
13 | #include <Library/BaseLib.h>\r | |
14 | #include <Library/DebugLib.h>\r | |
15 | #include <Library/DmaLib.h>\r | |
16 | #include <Library/DxeServicesTableLib.h>\r | |
17 | #include <Library/MemoryAllocationLib.h>\r | |
18 | #include <Library/UefiBootServicesTableLib.h>\r | |
19 | #include <Library/IoLib.h>\r | |
20 | #include <Library/BaseMemoryLib.h>\r | |
21 | \r | |
22 | #include <Protocol/Cpu.h>\r | |
23 | \r | |
24 | typedef struct {\r | |
25 | EFI_PHYSICAL_ADDRESS HostAddress;\r | |
26 | VOID *BufferAddress;\r | |
27 | UINTN NumberOfBytes;\r | |
28 | DMA_MAP_OPERATION Operation;\r | |
29 | BOOLEAN DoubleBuffer;\r | |
30 | } MAP_INFO_INSTANCE;\r | |
31 | \r | |
32 | \r | |
33 | typedef struct {\r | |
34 | LIST_ENTRY Link;\r | |
35 | VOID *HostAddress;\r | |
36 | UINTN NumPages;\r | |
37 | UINT64 Attributes;\r | |
38 | } UNCACHED_ALLOCATION;\r | |
39 | \r | |
40 | STATIC EFI_CPU_ARCH_PROTOCOL *mCpu;\r | |
41 | STATIC LIST_ENTRY UncachedAllocationList;\r | |
42 | \r | |
62a75650 AB |
43 | STATIC PHYSICAL_ADDRESS mDmaHostAddressLimit;\r |
44 | \r | |
723102c7 AB |
45 | STATIC\r |
46 | PHYSICAL_ADDRESS\r | |
47 | HostToDeviceAddress (\r | |
48 | IN VOID *Address\r | |
49 | )\r | |
50 | {\r | |
51 | return (PHYSICAL_ADDRESS)(UINTN)Address + PcdGet64 (PcdDmaDeviceOffset);\r | |
52 | }\r | |
53 | \r | |
62a75650 AB |
54 | /**\r |
55 | Allocates one or more 4KB pages of a certain memory type at a specified\r | |
56 | alignment.\r | |
57 | \r | |
58 | Allocates the number of 4KB pages specified by Pages of a certain memory type\r | |
59 | with an alignment specified by Alignment. The allocated buffer is returned.\r | |
60 | If Pages is 0, then NULL is returned. If there is not enough memory at the\r | |
61 | specified alignment remaining to satisfy the request, then NULL is returned.\r | |
62 | If Alignment is not a power of two and Alignment is not zero, then ASSERT().\r | |
63 | If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, then ASSERT().\r | |
64 | \r | |
65 | @param MemoryType The type of memory to allocate.\r | |
66 | @param Pages The number of 4 KB pages to allocate.\r | |
67 | @param Alignment The requested alignment of the allocation.\r | |
68 | Must be a power of two.\r | |
69 | If Alignment is zero, then byte alignment is\r | |
70 | used.\r | |
71 | \r | |
72 | @return A pointer to the allocated buffer or NULL if allocation fails.\r | |
73 | \r | |
74 | **/\r | |
75 | STATIC\r | |
76 | VOID *\r | |
77 | InternalAllocateAlignedPages (\r | |
78 | IN EFI_MEMORY_TYPE MemoryType,\r | |
79 | IN UINTN Pages,\r | |
80 | IN UINTN Alignment\r | |
81 | )\r | |
82 | {\r | |
83 | EFI_STATUS Status;\r | |
84 | EFI_PHYSICAL_ADDRESS Memory;\r | |
85 | UINTN AlignedMemory;\r | |
86 | UINTN AlignmentMask;\r | |
87 | UINTN UnalignedPages;\r | |
88 | UINTN RealPages;\r | |
89 | \r | |
90 | //\r | |
91 | // Alignment must be a power of two or zero.\r | |
92 | //\r | |
93 | ASSERT ((Alignment & (Alignment - 1)) == 0);\r | |
94 | \r | |
95 | if (Pages == 0) {\r | |
96 | return NULL;\r | |
97 | }\r | |
98 | if (Alignment > EFI_PAGE_SIZE) {\r | |
99 | //\r | |
100 | // Calculate the total number of pages since alignment is larger than page\r | |
101 | // size.\r | |
102 | //\r | |
103 | AlignmentMask = Alignment - 1;\r | |
104 | RealPages = Pages + EFI_SIZE_TO_PAGES (Alignment);\r | |
105 | //\r | |
106 | // Make sure that Pages plus EFI_SIZE_TO_PAGES (Alignment) does not\r | |
107 | // overflow.\r | |
108 | //\r | |
109 | ASSERT (RealPages > Pages);\r | |
110 | \r | |
111 | Memory = mDmaHostAddressLimit;\r | |
112 | Status = gBS->AllocatePages (AllocateMaxAddress, MemoryType, RealPages,\r | |
113 | &Memory);\r | |
114 | if (EFI_ERROR (Status)) {\r | |
115 | return NULL;\r | |
116 | }\r | |
117 | AlignedMemory = ((UINTN)Memory + AlignmentMask) & ~AlignmentMask;\r | |
118 | UnalignedPages = EFI_SIZE_TO_PAGES (AlignedMemory - (UINTN)Memory);\r | |
119 | if (UnalignedPages > 0) {\r | |
120 | //\r | |
121 | // Free first unaligned page(s).\r | |
122 | //\r | |
123 | Status = gBS->FreePages (Memory, UnalignedPages);\r | |
124 | ASSERT_EFI_ERROR (Status);\r | |
125 | }\r | |
126 | Memory = AlignedMemory + EFI_PAGES_TO_SIZE (Pages);\r | |
127 | UnalignedPages = RealPages - Pages - UnalignedPages;\r | |
128 | if (UnalignedPages > 0) {\r | |
129 | //\r | |
130 | // Free last unaligned page(s).\r | |
131 | //\r | |
132 | Status = gBS->FreePages (Memory, UnalignedPages);\r | |
133 | ASSERT_EFI_ERROR (Status);\r | |
134 | }\r | |
135 | } else {\r | |
136 | //\r | |
137 | // Do not over-allocate pages in this case.\r | |
138 | //\r | |
139 | Memory = mDmaHostAddressLimit;\r | |
140 | Status = gBS->AllocatePages (AllocateMaxAddress, MemoryType, Pages,\r | |
141 | &Memory);\r | |
142 | if (EFI_ERROR (Status)) {\r | |
143 | return NULL;\r | |
144 | }\r | |
145 | AlignedMemory = (UINTN)Memory;\r | |
146 | }\r | |
147 | return (VOID *)AlignedMemory;\r | |
148 | }\r | |
149 | \r | |
723102c7 AB |
150 | /**\r |
151 | Provides the DMA controller-specific addresses needed to access system memory.\r | |
152 | \r | |
153 | Operation is relative to the DMA bus master.\r | |
154 | \r | |
155 | @param Operation Indicates if the bus master is going to read or\r | |
156 | write to system memory.\r | |
157 | @param HostAddress The system memory address to map to the DMA\r | |
158 | controller.\r | |
159 | @param NumberOfBytes On input the number of bytes to map. On output\r | |
160 | the number of bytes that were mapped.\r | |
161 | @param DeviceAddress The resulting map address for the bus master\r | |
162 | controller to use to access the host's\r | |
163 | HostAddress.\r | |
164 | @param Mapping A resulting value to pass to Unmap().\r | |
165 | \r | |
166 | @retval EFI_SUCCESS The range was mapped for the returned\r | |
167 | NumberOfBytes.\r | |
168 | @retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common\r | |
169 | buffer.\r | |
170 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r | |
171 | @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack\r | |
172 | of resources.\r | |
173 | @retval EFI_DEVICE_ERROR The system hardware could not map the requested\r | |
174 | address.\r | |
175 | \r | |
176 | **/\r | |
177 | EFI_STATUS\r | |
178 | EFIAPI\r | |
179 | DmaMap (\r | |
180 | IN DMA_MAP_OPERATION Operation,\r | |
181 | IN VOID *HostAddress,\r | |
182 | IN OUT UINTN *NumberOfBytes,\r | |
183 | OUT PHYSICAL_ADDRESS *DeviceAddress,\r | |
184 | OUT VOID **Mapping\r | |
185 | )\r | |
186 | {\r | |
187 | EFI_STATUS Status;\r | |
188 | MAP_INFO_INSTANCE *Map;\r | |
189 | VOID *Buffer;\r | |
190 | EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;\r | |
191 | UINTN AllocSize;\r | |
192 | \r | |
193 | if (HostAddress == NULL ||\r | |
194 | NumberOfBytes == NULL ||\r | |
195 | DeviceAddress == NULL ||\r | |
196 | Mapping == NULL ) {\r | |
197 | return EFI_INVALID_PARAMETER;\r | |
198 | }\r | |
199 | \r | |
200 | if (Operation >= MapOperationMaximum) {\r | |
201 | return EFI_INVALID_PARAMETER;\r | |
202 | }\r | |
203 | \r | |
204 | *DeviceAddress = HostToDeviceAddress (HostAddress);\r | |
205 | \r | |
206 | // Remember range so we can flush on the other side\r | |
207 | Map = AllocatePool (sizeof (MAP_INFO_INSTANCE));\r | |
208 | if (Map == NULL) {\r | |
209 | return EFI_OUT_OF_RESOURCES;\r | |
210 | }\r | |
211 | \r | |
62a75650 AB |
212 | if (((UINTN)HostAddress + *NumberOfBytes) > mDmaHostAddressLimit) {\r |
213 | \r | |
214 | if (Operation == MapOperationBusMasterCommonBuffer) {\r | |
215 | goto CommonBufferError;\r | |
216 | }\r | |
217 | \r | |
218 | AllocSize = ALIGN_VALUE (*NumberOfBytes, mCpu->DmaBufferAlignment);\r | |
219 | Map->BufferAddress = InternalAllocateAlignedPages (EfiBootServicesData,\r | |
220 | EFI_SIZE_TO_PAGES (AllocSize),\r | |
221 | mCpu->DmaBufferAlignment);\r | |
222 | if (Map->BufferAddress == NULL) {\r | |
223 | Status = EFI_OUT_OF_RESOURCES;\r | |
224 | goto FreeMapInfo;\r | |
225 | }\r | |
226 | \r | |
227 | if (Map->Operation == MapOperationBusMasterRead) {\r | |
228 | CopyMem (Map->BufferAddress, (VOID *)(UINTN)Map->HostAddress,\r | |
229 | *NumberOfBytes);\r | |
230 | }\r | |
231 | mCpu->FlushDataCache (mCpu, (UINTN)Map->BufferAddress, AllocSize,\r | |
232 | EfiCpuFlushTypeWriteBack);\r | |
233 | \r | |
234 | *DeviceAddress = HostToDeviceAddress (Map->BufferAddress);\r | |
235 | } else if (Operation != MapOperationBusMasterRead &&\r | |
723102c7 AB |
236 | ((((UINTN)HostAddress & (mCpu->DmaBufferAlignment - 1)) != 0) ||\r |
237 | ((*NumberOfBytes & (mCpu->DmaBufferAlignment - 1)) != 0))) {\r | |
238 | \r | |
239 | // Get the cacheability of the region\r | |
240 | Status = gDS->GetMemorySpaceDescriptor ((UINTN)HostAddress, &GcdDescriptor);\r | |
241 | if (EFI_ERROR(Status)) {\r | |
242 | goto FreeMapInfo;\r | |
243 | }\r | |
244 | \r | |
245 | // If the mapped buffer is not an uncached buffer\r | |
246 | if ((GcdDescriptor.Attributes & (EFI_MEMORY_WB | EFI_MEMORY_WT)) != 0) {\r | |
247 | //\r | |
248 | // Operations of type MapOperationBusMasterCommonBuffer are only allowed\r | |
249 | // on uncached buffers.\r | |
250 | //\r | |
251 | if (Operation == MapOperationBusMasterCommonBuffer) {\r | |
62a75650 | 252 | goto CommonBufferError;\r |
723102c7 AB |
253 | }\r |
254 | \r | |
255 | //\r | |
256 | // If the buffer does not fill entire cache lines we must double buffer\r | |
257 | // into a suitably aligned allocation that allows us to invalidate the\r | |
258 | // cache without running the risk of corrupting adjacent unrelated data.\r | |
259 | // Note that pool allocations are guaranteed to be 8 byte aligned, so\r | |
260 | // we only have to add (alignment - 8) worth of padding.\r | |
261 | //\r | |
262 | Map->DoubleBuffer = TRUE;\r | |
263 | AllocSize = ALIGN_VALUE (*NumberOfBytes, mCpu->DmaBufferAlignment) +\r | |
264 | (mCpu->DmaBufferAlignment - 8);\r | |
265 | Map->BufferAddress = AllocatePool (AllocSize);\r | |
266 | if (Map->BufferAddress == NULL) {\r | |
267 | Status = EFI_OUT_OF_RESOURCES;\r | |
268 | goto FreeMapInfo;\r | |
269 | }\r | |
270 | \r | |
271 | Buffer = ALIGN_POINTER (Map->BufferAddress, mCpu->DmaBufferAlignment);\r | |
272 | *DeviceAddress = HostToDeviceAddress (Buffer);\r | |
273 | \r | |
274 | //\r | |
275 | // Get rid of any dirty cachelines covering the double buffer. This\r | |
276 | // prevents them from being written back unexpectedly, potentially\r | |
277 | // overwriting the data we receive from the device.\r | |
278 | //\r | |
279 | mCpu->FlushDataCache (mCpu, (UINTN)Buffer, *NumberOfBytes,\r | |
280 | EfiCpuFlushTypeWriteBack);\r | |
281 | } else {\r | |
282 | Map->DoubleBuffer = FALSE;\r | |
283 | }\r | |
284 | } else {\r | |
285 | Map->DoubleBuffer = FALSE;\r | |
286 | \r | |
287 | DEBUG_CODE_BEGIN ();\r | |
288 | \r | |
289 | //\r | |
290 | // The operation type check above only executes if the buffer happens to be\r | |
291 | // misaligned with respect to CWG, but even if it is aligned, we should not\r | |
292 | // allow arbitrary buffers to be used for creating consistent mappings.\r | |
293 | // So duplicate the check here when running in DEBUG mode, just to assert\r | |
294 | // that we are not trying to create a consistent mapping for cached memory.\r | |
295 | //\r | |
296 | Status = gDS->GetMemorySpaceDescriptor ((UINTN)HostAddress, &GcdDescriptor);\r | |
297 | ASSERT_EFI_ERROR(Status);\r | |
298 | \r | |
299 | ASSERT (Operation != MapOperationBusMasterCommonBuffer ||\r | |
300 | (GcdDescriptor.Attributes & (EFI_MEMORY_WB | EFI_MEMORY_WT)) == 0);\r | |
301 | \r | |
302 | DEBUG_CODE_END ();\r | |
303 | \r | |
304 | // Flush the Data Cache (should not have any effect if the memory region is\r | |
305 | // uncached)\r | |
306 | mCpu->FlushDataCache (mCpu, (UINTN)HostAddress, *NumberOfBytes,\r | |
307 | EfiCpuFlushTypeWriteBackInvalidate);\r | |
308 | }\r | |
309 | \r | |
310 | Map->HostAddress = (UINTN)HostAddress;\r | |
311 | Map->NumberOfBytes = *NumberOfBytes;\r | |
312 | Map->Operation = Operation;\r | |
313 | \r | |
314 | *Mapping = Map;\r | |
315 | \r | |
316 | return EFI_SUCCESS;\r | |
317 | \r | |
62a75650 AB |
318 | CommonBufferError:\r |
319 | DEBUG ((DEBUG_ERROR,\r | |
320 | "%a: Operation type 'MapOperationBusMasterCommonBuffer' is only "\r | |
321 | "supported\non memory regions that were allocated using "\r | |
322 | "DmaAllocateBuffer ()\n", __FUNCTION__));\r | |
323 | Status = EFI_UNSUPPORTED;\r | |
723102c7 AB |
324 | FreeMapInfo:\r |
325 | FreePool (Map);\r | |
326 | \r | |
327 | return Status;\r | |
328 | }\r | |
329 | \r | |
330 | \r | |
331 | /**\r | |
332 | Completes the DmaMapBusMasterRead(), DmaMapBusMasterWrite(), or\r | |
333 | DmaMapBusMasterCommonBuffer() operation and releases any corresponding\r | |
334 | resources.\r | |
335 | \r | |
336 | @param Mapping The mapping value returned from DmaMap*().\r | |
337 | \r | |
338 | @retval EFI_SUCCESS The range was unmapped.\r | |
339 | @retval EFI_DEVICE_ERROR The data was not committed to the target system\r | |
340 | memory.\r | |
341 | @retval EFI_INVALID_PARAMETER An inconsistency was detected between the\r | |
342 | mapping type and the DoubleBuffer field\r | |
343 | \r | |
344 | **/\r | |
345 | EFI_STATUS\r | |
346 | EFIAPI\r | |
347 | DmaUnmap (\r | |
348 | IN VOID *Mapping\r | |
349 | )\r | |
350 | {\r | |
351 | MAP_INFO_INSTANCE *Map;\r | |
352 | EFI_STATUS Status;\r | |
353 | VOID *Buffer;\r | |
62a75650 | 354 | UINTN AllocSize;\r |
723102c7 AB |
355 | \r |
356 | if (Mapping == NULL) {\r | |
357 | ASSERT (FALSE);\r | |
358 | return EFI_INVALID_PARAMETER;\r | |
359 | }\r | |
360 | \r | |
361 | Map = (MAP_INFO_INSTANCE *)Mapping;\r | |
362 | \r | |
363 | Status = EFI_SUCCESS;\r | |
62a75650 AB |
364 | if (((UINTN)Map->HostAddress + Map->NumberOfBytes) > mDmaHostAddressLimit) {\r |
365 | AllocSize = ALIGN_VALUE (Map->NumberOfBytes, mCpu->DmaBufferAlignment);\r | |
366 | if (Map->Operation == MapOperationBusMasterWrite) {\r | |
367 | mCpu->FlushDataCache (mCpu, (UINTN)Map->BufferAddress, AllocSize,\r | |
368 | EfiCpuFlushTypeInvalidate);\r | |
369 | CopyMem ((VOID *)(UINTN)Map->HostAddress, Map->BufferAddress,\r | |
370 | Map->NumberOfBytes);\r | |
371 | }\r | |
372 | FreePages (Map->BufferAddress, EFI_SIZE_TO_PAGES (AllocSize));\r | |
373 | } else if (Map->DoubleBuffer) {\r | |
374 | \r | |
723102c7 AB |
375 | ASSERT (Map->Operation == MapOperationBusMasterWrite);\r |
376 | \r | |
377 | if (Map->Operation != MapOperationBusMasterWrite) {\r | |
378 | Status = EFI_INVALID_PARAMETER;\r | |
379 | } else {\r | |
380 | Buffer = ALIGN_POINTER (Map->BufferAddress, mCpu->DmaBufferAlignment);\r | |
381 | \r | |
382 | mCpu->FlushDataCache (mCpu, (UINTN)Buffer, Map->NumberOfBytes,\r | |
383 | EfiCpuFlushTypeInvalidate);\r | |
384 | \r | |
385 | CopyMem ((VOID *)(UINTN)Map->HostAddress, Buffer, Map->NumberOfBytes);\r | |
386 | \r | |
387 | FreePool (Map->BufferAddress);\r | |
388 | }\r | |
389 | } else {\r | |
390 | if (Map->Operation == MapOperationBusMasterWrite) {\r | |
391 | //\r | |
392 | // Make sure we read buffer from uncached memory and not the cache\r | |
393 | //\r | |
394 | mCpu->FlushDataCache (mCpu, Map->HostAddress, Map->NumberOfBytes,\r | |
395 | EfiCpuFlushTypeInvalidate);\r | |
396 | }\r | |
397 | }\r | |
398 | \r | |
399 | FreePool (Map);\r | |
400 | \r | |
401 | return Status;\r | |
402 | }\r | |
403 | \r | |
404 | /**\r | |
405 | Allocates pages that are suitable for an DmaMap() of type\r | |
406 | MapOperationBusMasterCommonBuffer mapping.\r | |
407 | \r | |
408 | @param MemoryType The type of memory to allocate,\r | |
409 | EfiBootServicesData or EfiRuntimeServicesData.\r | |
410 | @param Pages The number of pages to allocate.\r | |
411 | @param HostAddress A pointer to store the base system memory\r | |
412 | address of the allocated range.\r | |
413 | \r | |
414 | @retval EFI_SUCCESS The requested memory pages were allocated.\r | |
415 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r | |
416 | @retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.\r | |
417 | \r | |
418 | **/\r | |
419 | EFI_STATUS\r | |
420 | EFIAPI\r | |
421 | DmaAllocateBuffer (\r | |
422 | IN EFI_MEMORY_TYPE MemoryType,\r | |
423 | IN UINTN Pages,\r | |
424 | OUT VOID **HostAddress\r | |
425 | )\r | |
426 | {\r | |
427 | return DmaAllocateAlignedBuffer (MemoryType, Pages, 0, HostAddress);\r | |
428 | }\r | |
429 | \r | |
430 | /**\r | |
431 | Allocates pages that are suitable for an DmaMap() of type\r | |
432 | MapOperationBusMasterCommonBuffer mapping, at the requested alignment.\r | |
433 | \r | |
434 | @param MemoryType The type of memory to allocate,\r | |
435 | EfiBootServicesData or EfiRuntimeServicesData.\r | |
436 | @param Pages The number of pages to allocate.\r | |
437 | @param Alignment Alignment in bytes of the base of the returned\r | |
438 | buffer (must be a power of 2)\r | |
439 | @param HostAddress A pointer to store the base system memory\r | |
440 | address of the allocated range.\r | |
441 | \r | |
442 | @retval EFI_SUCCESS The requested memory pages were allocated.\r | |
443 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r | |
444 | @retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.\r | |
445 | \r | |
446 | **/\r | |
447 | EFI_STATUS\r | |
448 | EFIAPI\r | |
449 | DmaAllocateAlignedBuffer (\r | |
450 | IN EFI_MEMORY_TYPE MemoryType,\r | |
451 | IN UINTN Pages,\r | |
452 | IN UINTN Alignment,\r | |
453 | OUT VOID **HostAddress\r | |
454 | )\r | |
455 | {\r | |
456 | EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;\r | |
457 | VOID *Allocation;\r | |
458 | UINT64 MemType;\r | |
459 | UNCACHED_ALLOCATION *Alloc;\r | |
460 | EFI_STATUS Status;\r | |
461 | \r | |
462 | if (Alignment == 0) {\r | |
463 | Alignment = EFI_PAGE_SIZE;\r | |
464 | }\r | |
465 | \r | |
466 | if (HostAddress == NULL ||\r | |
467 | (Alignment & (Alignment - 1)) != 0) {\r | |
468 | return EFI_INVALID_PARAMETER;\r | |
469 | }\r | |
470 | \r | |
62a75650 AB |
471 | if (MemoryType == EfiBootServicesData ||\r |
472 | MemoryType == EfiRuntimeServicesData) {\r | |
473 | Allocation = InternalAllocateAlignedPages (MemoryType, Pages, Alignment);\r | |
723102c7 AB |
474 | } else {\r |
475 | return EFI_INVALID_PARAMETER;\r | |
476 | }\r | |
477 | \r | |
478 | if (Allocation == NULL) {\r | |
479 | return EFI_OUT_OF_RESOURCES;\r | |
480 | }\r | |
481 | \r | |
482 | // Get the cacheability of the region\r | |
483 | Status = gDS->GetMemorySpaceDescriptor ((UINTN)Allocation, &GcdDescriptor);\r | |
484 | if (EFI_ERROR(Status)) {\r | |
485 | goto FreeBuffer;\r | |
486 | }\r | |
487 | \r | |
488 | // Choose a suitable uncached memory type that is supported by the region\r | |
489 | if (GcdDescriptor.Capabilities & EFI_MEMORY_WC) {\r | |
490 | MemType = EFI_MEMORY_WC;\r | |
491 | } else if (GcdDescriptor.Capabilities & EFI_MEMORY_UC) {\r | |
492 | MemType = EFI_MEMORY_UC;\r | |
493 | } else {\r | |
494 | Status = EFI_UNSUPPORTED;\r | |
495 | goto FreeBuffer;\r | |
496 | }\r | |
497 | \r | |
498 | Alloc = AllocatePool (sizeof *Alloc);\r | |
499 | if (Alloc == NULL) {\r | |
500 | goto FreeBuffer;\r | |
501 | }\r | |
502 | \r | |
503 | Alloc->HostAddress = Allocation;\r | |
504 | Alloc->NumPages = Pages;\r | |
505 | Alloc->Attributes = GcdDescriptor.Attributes;\r | |
506 | \r | |
507 | InsertHeadList (&UncachedAllocationList, &Alloc->Link);\r | |
508 | \r | |
509 | // Remap the region with the new attributes\r | |
510 | Status = gDS->SetMemorySpaceAttributes ((PHYSICAL_ADDRESS)(UINTN)Allocation,\r | |
511 | EFI_PAGES_TO_SIZE (Pages),\r | |
512 | MemType);\r | |
513 | if (EFI_ERROR (Status)) {\r | |
514 | goto FreeAlloc;\r | |
515 | }\r | |
516 | \r | |
517 | Status = mCpu->FlushDataCache (mCpu,\r | |
518 | (PHYSICAL_ADDRESS)(UINTN)Allocation,\r | |
519 | EFI_PAGES_TO_SIZE (Pages),\r | |
520 | EfiCpuFlushTypeInvalidate);\r | |
521 | if (EFI_ERROR (Status)) {\r | |
522 | goto FreeAlloc;\r | |
523 | }\r | |
524 | \r | |
525 | *HostAddress = Allocation;\r | |
526 | \r | |
527 | return EFI_SUCCESS;\r | |
528 | \r | |
529 | FreeAlloc:\r | |
530 | RemoveEntryList (&Alloc->Link);\r | |
531 | FreePool (Alloc);\r | |
532 | \r | |
533 | FreeBuffer:\r | |
534 | FreePages (Allocation, Pages);\r | |
535 | return Status;\r | |
536 | }\r | |
537 | \r | |
538 | \r | |
539 | /**\r | |
540 | Frees memory that was allocated with DmaAllocateBuffer().\r | |
541 | \r | |
542 | @param Pages The number of pages to free.\r | |
543 | @param HostAddress The base system memory address of the allocated\r | |
544 | range.\r | |
545 | \r | |
546 | @retval EFI_SUCCESS The requested memory pages were freed.\r | |
547 | @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and\r | |
548 | Pages was not allocated with\r | |
549 | DmaAllocateBuffer().\r | |
550 | \r | |
551 | **/\r | |
552 | EFI_STATUS\r | |
553 | EFIAPI\r | |
554 | DmaFreeBuffer (\r | |
555 | IN UINTN Pages,\r | |
556 | IN VOID *HostAddress\r | |
557 | )\r | |
558 | {\r | |
559 | LIST_ENTRY *Link;\r | |
560 | UNCACHED_ALLOCATION *Alloc;\r | |
561 | BOOLEAN Found;\r | |
562 | EFI_STATUS Status;\r | |
563 | \r | |
564 | if (HostAddress == NULL) {\r | |
565 | return EFI_INVALID_PARAMETER;\r | |
566 | }\r | |
567 | \r | |
568 | for (Link = GetFirstNode (&UncachedAllocationList), Found = FALSE;\r | |
569 | !IsNull (&UncachedAllocationList, Link);\r | |
570 | Link = GetNextNode (&UncachedAllocationList, Link)) {\r | |
571 | \r | |
572 | Alloc = BASE_CR (Link, UNCACHED_ALLOCATION, Link);\r | |
573 | if (Alloc->HostAddress == HostAddress && Alloc->NumPages == Pages) {\r | |
574 | Found = TRUE;\r | |
575 | break;\r | |
576 | }\r | |
577 | }\r | |
578 | \r | |
579 | if (!Found) {\r | |
580 | ASSERT (FALSE);\r | |
581 | return EFI_INVALID_PARAMETER;\r | |
582 | }\r | |
583 | \r | |
584 | RemoveEntryList (&Alloc->Link);\r | |
585 | \r | |
586 | Status = gDS->SetMemorySpaceAttributes ((PHYSICAL_ADDRESS)(UINTN)HostAddress,\r | |
587 | EFI_PAGES_TO_SIZE (Pages),\r | |
588 | Alloc->Attributes);\r | |
589 | if (EFI_ERROR (Status)) {\r | |
590 | goto FreeAlloc;\r | |
591 | }\r | |
592 | \r | |
593 | //\r | |
594 | // If we fail to restore the original attributes, it is better to leak the\r | |
595 | // memory than to return it to the heap\r | |
596 | //\r | |
597 | FreePages (HostAddress, Pages);\r | |
598 | \r | |
599 | FreeAlloc:\r | |
600 | FreePool (Alloc);\r | |
601 | return Status;\r | |
602 | }\r | |
603 | \r | |
604 | \r | |
605 | EFI_STATUS\r | |
606 | EFIAPI\r | |
607 | NonCoherentDmaLibConstructor (\r | |
608 | IN EFI_HANDLE ImageHandle,\r | |
609 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
610 | )\r | |
611 | {\r | |
612 | InitializeListHead (&UncachedAllocationList);\r | |
613 | \r | |
62a75650 AB |
614 | //\r |
615 | // Ensure that the combination of DMA addressing offset and limit produces\r | |
616 | // a sane value.\r | |
617 | //\r | |
618 | ASSERT (PcdGet64 (PcdDmaDeviceLimit) > PcdGet64 (PcdDmaDeviceOffset));\r | |
619 | \r | |
620 | mDmaHostAddressLimit = PcdGet64 (PcdDmaDeviceLimit) -\r | |
621 | PcdGet64 (PcdDmaDeviceOffset);\r | |
622 | \r | |
723102c7 AB |
623 | // Get the Cpu protocol for later use\r |
624 | return gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&mCpu);\r | |
625 | }\r |