]>
Commit | Line | Data |
---|---|---|
4b1bf81c | 1 | /** @file\r |
2 | PEIM to produce gPeiUsb2HostControllerPpiGuid based on gPeiUsbControllerPpiGuid\r | |
3 | which is used to enable recovery function from USB Drivers.\r | |
4 | \r | |
d1102dba LG |
5 | Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>\r |
6 | \r | |
9d510e61 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
4b1bf81c | 8 | \r |
9 | **/\r | |
10 | \r | |
11 | #include "EhcPeim.h"\r | |
12 | \r | |
13 | /**\r | |
14 | Allocate a block of memory to be used by the buffer pool.\r | |
15 | \r | |
16 | @param Ehc The EHCI device.\r | |
17 | @param Pool The buffer pool to allocate memory for.\r | |
18 | @param Pages How many pages to allocate.\r | |
19 | \r | |
20 | @return The allocated memory block or NULL if failed.\r | |
21 | \r | |
22 | **/\r | |
23 | USBHC_MEM_BLOCK *\r | |
24 | UsbHcAllocMemBlock (\r | |
1436aea4 MK |
25 | IN PEI_USB2_HC_DEV *Ehc,\r |
26 | IN USBHC_MEM_POOL *Pool,\r | |
27 | IN UINTN Pages\r | |
4b1bf81c | 28 | )\r |
29 | {\r | |
1436aea4 MK |
30 | USBHC_MEM_BLOCK *Block;\r |
31 | VOID *BufHost;\r | |
32 | VOID *Mapping;\r | |
33 | EFI_PHYSICAL_ADDRESS MappedAddr;\r | |
34 | EFI_STATUS Status;\r | |
35 | UINTN PageNumber;\r | |
36 | EFI_PHYSICAL_ADDRESS TempPtr;\r | |
37 | \r | |
38 | Mapping = NULL;\r | |
39 | PageNumber = sizeof (USBHC_MEM_BLOCK)/PAGESIZE +1;\r | |
40 | Status = PeiServicesAllocatePages (\r | |
41 | EfiBootServicesCode,\r | |
42 | PageNumber,\r | |
43 | &TempPtr\r | |
44 | );\r | |
4b1bf81c | 45 | \r |
46 | if (EFI_ERROR (Status)) {\r | |
1436aea4 | 47 | return NULL;\r |
4b1bf81c | 48 | }\r |
1436aea4 | 49 | \r |
4b1bf81c | 50 | ZeroMem ((VOID *)(UINTN)TempPtr, PageNumber*EFI_PAGE_SIZE);\r |
d1102dba | 51 | \r |
4b1bf81c | 52 | //\r |
53 | // each bit in the bit array represents USBHC_MEM_UNIT\r | |
54 | // bytes of memory in the memory block.\r | |
55 | //\r | |
56 | ASSERT (USBHC_MEM_UNIT * 8 <= EFI_PAGE_SIZE);\r | |
d1102dba | 57 | \r |
1436aea4 MK |
58 | Block = (USBHC_MEM_BLOCK *)(UINTN)TempPtr;\r |
59 | Block->BufLen = EFI_PAGES_TO_SIZE (Pages);\r | |
60 | Block->BitsLen = Block->BufLen / (USBHC_MEM_UNIT * 8);\r | |
d1102dba | 61 | \r |
4b1bf81c | 62 | PageNumber = (Block->BitsLen)/PAGESIZE +1;\r |
1436aea4 MK |
63 | Status = PeiServicesAllocatePages (\r |
64 | EfiBootServicesCode,\r | |
65 | PageNumber,\r | |
66 | &TempPtr\r | |
67 | );\r | |
68 | \r | |
69 | if (EFI_ERROR (Status)) {\r | |
70 | return NULL;\r | |
71 | }\r | |
d1102dba | 72 | \r |
d1102dba | 73 | ZeroMem ((VOID *)(UINTN)TempPtr, PageNumber*EFI_PAGE_SIZE);\r |
4b1bf81c | 74 | \r |
1436aea4 | 75 | Block->Bits = (UINT8 *)(UINTN)TempPtr;\r |
4b1bf81c | 76 | \r |
2c656af0 SZ |
77 | Status = IoMmuAllocateBuffer (\r |
78 | Ehc->IoMmu,\r | |
4b1bf81c | 79 | Pages,\r |
1436aea4 | 80 | (VOID **)&BufHost,\r |
2c656af0 SZ |
81 | &MappedAddr,\r |
82 | &Mapping\r | |
4b1bf81c | 83 | );\r |
2c656af0 SZ |
84 | if (EFI_ERROR (Status)) {\r |
85 | return NULL;\r | |
86 | }\r | |
1436aea4 | 87 | \r |
2c656af0 | 88 | ZeroMem (BufHost, Pages*EFI_PAGE_SIZE);\r |
4b1bf81c | 89 | \r |
4b1bf81c | 90 | //\r |
91 | // Check whether the data structure used by the host controller\r | |
92 | // should be restricted into the same 4G\r | |
93 | //\r | |
94 | if (Pool->Check4G && (Pool->Which4G != USB_HC_HIGH_32BIT (MappedAddr))) {\r | |
1436aea4 | 95 | return NULL;\r |
4b1bf81c | 96 | }\r |
97 | \r | |
1436aea4 MK |
98 | Block->BufHost = BufHost;\r |
99 | Block->Buf = (UINT8 *)((UINTN)MappedAddr);\r | |
100 | Block->Mapping = Mapping;\r | |
101 | Block->Next = NULL;\r | |
4b1bf81c | 102 | \r |
103 | return Block;\r | |
4b1bf81c | 104 | }\r |
105 | \r | |
106 | /**\r | |
107 | Free the memory block from the memory pool.\r | |
108 | \r | |
2c656af0 | 109 | @param Ehc The EHCI device.\r |
4b1bf81c | 110 | @param Pool The memory pool to free the block from.\r |
111 | @param Block The memory block to free.\r | |
112 | \r | |
113 | **/\r | |
114 | VOID\r | |
115 | UsbHcFreeMemBlock (\r | |
1436aea4 MK |
116 | IN PEI_USB2_HC_DEV *Ehc,\r |
117 | IN USBHC_MEM_POOL *Pool,\r | |
118 | IN USBHC_MEM_BLOCK *Block\r | |
4b1bf81c | 119 | )\r |
120 | {\r | |
121 | ASSERT ((Pool != NULL) && (Block != NULL));\r | |
2c656af0 SZ |
122 | \r |
123 | IoMmuFreeBuffer (Ehc->IoMmu, EFI_SIZE_TO_PAGES (Block->BufLen), Block->BufHost, Block->Mapping);\r | |
4b1bf81c | 124 | }\r |
125 | \r | |
126 | /**\r | |
127 | Alloc some memory from the block.\r | |
128 | \r | |
129 | @param Block The memory block to allocate memory from.\r | |
130 | @param Units Number of memory units to allocate.\r | |
131 | \r | |
132 | @return The pointer to the allocated memory. If couldn't allocate the needed memory,\r | |
133 | the return value is NULL.\r | |
134 | \r | |
135 | **/\r | |
136 | VOID *\r | |
137 | UsbHcAllocMemFromBlock (\r | |
1436aea4 MK |
138 | IN USBHC_MEM_BLOCK *Block,\r |
139 | IN UINTN Units\r | |
4b1bf81c | 140 | )\r |
141 | {\r | |
1436aea4 MK |
142 | UINTN Byte;\r |
143 | UINT8 Bit;\r | |
144 | UINTN StartByte;\r | |
145 | UINT8 StartBit;\r | |
146 | UINTN Available;\r | |
147 | UINTN Count;\r | |
4b1bf81c | 148 | \r |
149 | ASSERT ((Block != 0) && (Units != 0));\r | |
150 | \r | |
1436aea4 MK |
151 | StartByte = 0;\r |
152 | StartBit = 0;\r | |
153 | Available = 0;\r | |
4b1bf81c | 154 | \r |
155 | for (Byte = 0, Bit = 0; Byte < Block->BitsLen;) {\r | |
156 | //\r | |
157 | // If current bit is zero, the corresponding memory unit is\r | |
158 | // available, otherwise we need to restart our searching.\r | |
159 | // Available counts the consective number of zero bit.\r | |
160 | //\r | |
161 | if (!USB_HC_BIT_IS_SET (Block->Bits[Byte], Bit)) {\r | |
162 | Available++;\r | |
163 | \r | |
164 | if (Available >= Units) {\r | |
165 | break;\r | |
166 | }\r | |
167 | \r | |
168 | NEXT_BIT (Byte, Bit);\r | |
4b1bf81c | 169 | } else {\r |
170 | NEXT_BIT (Byte, Bit);\r | |
171 | \r | |
1436aea4 MK |
172 | Available = 0;\r |
173 | StartByte = Byte;\r | |
174 | StartBit = Bit;\r | |
4b1bf81c | 175 | }\r |
176 | }\r | |
177 | \r | |
178 | if (Available < Units) {\r | |
179 | return NULL;\r | |
180 | }\r | |
d1102dba | 181 | \r |
4b1bf81c | 182 | //\r |
183 | // Mark the memory as allocated\r | |
184 | //\r | |
1436aea4 MK |
185 | Byte = StartByte;\r |
186 | Bit = StartBit;\r | |
4b1bf81c | 187 | \r |
188 | for (Count = 0; Count < Units; Count++) {\r | |
189 | ASSERT (!USB_HC_BIT_IS_SET (Block->Bits[Byte], Bit));\r | |
190 | \r | |
1436aea4 | 191 | Block->Bits[Byte] = (UINT8)(Block->Bits[Byte] | (UINT8)USB_HC_BIT (Bit));\r |
4b1bf81c | 192 | NEXT_BIT (Byte, Bit);\r |
193 | }\r | |
194 | \r | |
195 | return Block->Buf + (StartByte * 8 + StartBit) * USBHC_MEM_UNIT;\r | |
196 | }\r | |
197 | \r | |
2c656af0 SZ |
198 | /**\r |
199 | Calculate the corresponding pci bus address according to the Mem parameter.\r | |
200 | \r | |
201 | @param Pool The memory pool of the host controller.\r | |
202 | @param Mem The pointer to host memory.\r | |
203 | @param Size The size of the memory region.\r | |
204 | \r | |
205 | @return the pci memory address\r | |
206 | **/\r | |
207 | EFI_PHYSICAL_ADDRESS\r | |
208 | UsbHcGetPciAddressForHostMem (\r | |
1436aea4 MK |
209 | IN USBHC_MEM_POOL *Pool,\r |
210 | IN VOID *Mem,\r | |
211 | IN UINTN Size\r | |
2c656af0 SZ |
212 | )\r |
213 | {\r | |
1436aea4 MK |
214 | USBHC_MEM_BLOCK *Head;\r |
215 | USBHC_MEM_BLOCK *Block;\r | |
216 | UINTN AllocSize;\r | |
217 | EFI_PHYSICAL_ADDRESS PhyAddr;\r | |
218 | UINTN Offset;\r | |
2c656af0 SZ |
219 | \r |
220 | Head = Pool->Head;\r | |
221 | AllocSize = USBHC_MEM_ROUND (Size);\r | |
222 | \r | |
223 | if (Mem == NULL) {\r | |
224 | return 0;\r | |
225 | }\r | |
226 | \r | |
227 | for (Block = Head; Block != NULL; Block = Block->Next) {\r | |
228 | //\r | |
229 | // scan the memory block list for the memory block that\r | |
230 | // completely contains the allocated memory.\r | |
231 | //\r | |
1436aea4 | 232 | if ((Block->BufHost <= (UINT8 *)Mem) && (((UINT8 *)Mem + AllocSize) <= (Block->BufHost + Block->BufLen))) {\r |
2c656af0 SZ |
233 | break;\r |
234 | }\r | |
235 | }\r | |
236 | \r | |
237 | ASSERT ((Block != NULL));\r | |
238 | //\r | |
239 | // calculate the pci memory address for host memory address.\r | |
240 | //\r | |
1436aea4 MK |
241 | Offset = (UINT8 *)Mem - Block->BufHost;\r |
242 | PhyAddr = (EFI_PHYSICAL_ADDRESS)(UINTN)(Block->Buf + Offset);\r | |
2c656af0 SZ |
243 | return PhyAddr;\r |
244 | }\r | |
245 | \r | |
4b1bf81c | 246 | /**\r |
247 | Insert the memory block to the pool's list of the blocks.\r | |
248 | \r | |
249 | @param Head The head of the memory pool's block list.\r | |
250 | @param Block The memory block to insert.\r | |
251 | \r | |
252 | **/\r | |
253 | VOID\r | |
254 | UsbHcInsertMemBlockToPool (\r | |
1436aea4 MK |
255 | IN USBHC_MEM_BLOCK *Head,\r |
256 | IN USBHC_MEM_BLOCK *Block\r | |
4b1bf81c | 257 | )\r |
258 | {\r | |
259 | ASSERT ((Head != NULL) && (Block != NULL));\r | |
260 | Block->Next = Head->Next;\r | |
261 | Head->Next = Block;\r | |
262 | }\r | |
263 | \r | |
264 | /**\r | |
265 | Is the memory block empty?\r | |
266 | \r | |
267 | @param Block The memory block to check.\r | |
268 | \r | |
269 | @retval TRUE The memory block is empty.\r | |
270 | @retval FALSE The memory block isn't empty.\r | |
271 | \r | |
272 | **/\r | |
273 | BOOLEAN\r | |
274 | UsbHcIsMemBlockEmpty (\r | |
1436aea4 | 275 | IN USBHC_MEM_BLOCK *Block\r |
4b1bf81c | 276 | )\r |
277 | {\r | |
1436aea4 | 278 | UINTN Index;\r |
d1102dba | 279 | \r |
4b1bf81c | 280 | for (Index = 0; Index < Block->BitsLen; Index++) {\r |
281 | if (Block->Bits[Index] != 0) {\r | |
282 | return FALSE;\r | |
283 | }\r | |
284 | }\r | |
285 | \r | |
286 | return TRUE;\r | |
287 | }\r | |
288 | \r | |
4b1bf81c | 289 | /**\r |
290 | Initialize the memory management pool for the host controller.\r | |
d1102dba | 291 | \r |
4b1bf81c | 292 | @param Ehc The EHCI device.\r |
293 | @param Check4G Whether the host controller requires allocated memory.\r | |
294 | from one 4G address space.\r | |
295 | @param Which4G The 4G memory area each memory allocated should be from.\r | |
296 | \r | |
297 | @retval EFI_SUCCESS The memory pool is initialized.\r | |
298 | @retval EFI_OUT_OF_RESOURCE Fail to init the memory pool.\r | |
299 | \r | |
300 | **/\r | |
301 | USBHC_MEM_POOL *\r | |
302 | UsbHcInitMemPool (\r | |
1436aea4 MK |
303 | IN PEI_USB2_HC_DEV *Ehc,\r |
304 | IN BOOLEAN Check4G,\r | |
305 | IN UINT32 Which4G\r | |
4b1bf81c | 306 | )\r |
307 | {\r | |
1436aea4 MK |
308 | USBHC_MEM_POOL *Pool;\r |
309 | UINTN PageNumber;\r | |
310 | EFI_STATUS Status;\r | |
311 | EFI_PHYSICAL_ADDRESS TempPtr;\r | |
312 | \r | |
313 | PageNumber = sizeof (USBHC_MEM_POOL)/PAGESIZE +1;\r | |
314 | Status = PeiServicesAllocatePages (\r | |
315 | EfiBootServicesCode,\r | |
316 | PageNumber,\r | |
317 | &TempPtr\r | |
318 | );\r | |
319 | \r | |
320 | if (EFI_ERROR (Status)) {\r | |
321 | return NULL;\r | |
322 | }\r | |
4b1bf81c | 323 | \r |
d1102dba | 324 | ZeroMem ((VOID *)(UINTN)TempPtr, PageNumber*EFI_PAGE_SIZE);\r |
4b1bf81c | 325 | \r |
1436aea4 | 326 | Pool = (USBHC_MEM_POOL *)((UINTN)TempPtr);\r |
4b1bf81c | 327 | \r |
328 | Pool->Check4G = Check4G;\r | |
329 | Pool->Which4G = Which4G;\r | |
330 | Pool->Head = UsbHcAllocMemBlock (Ehc, Pool, USBHC_MEM_DEFAULT_PAGES);\r | |
331 | \r | |
332 | if (Pool->Head == NULL) {\r | |
333 | Pool = NULL;\r | |
334 | }\r | |
335 | \r | |
336 | return Pool;\r | |
337 | }\r | |
338 | \r | |
339 | /**\r | |
340 | Release the memory management pool.\r | |
2c656af0 SZ |
341 | \r |
342 | @param Ehc The EHCI device.\r | |
4b1bf81c | 343 | @param Pool The USB memory pool to free.\r |
344 | \r | |
345 | @retval EFI_DEVICE_ERROR Fail to free the memory pool.\r | |
346 | @retval EFI_SUCCESS The memory pool is freed.\r | |
347 | \r | |
348 | **/\r | |
349 | EFI_STATUS\r | |
350 | UsbHcFreeMemPool (\r | |
1436aea4 MK |
351 | IN PEI_USB2_HC_DEV *Ehc,\r |
352 | IN USBHC_MEM_POOL *Pool\r | |
4b1bf81c | 353 | )\r |
354 | {\r | |
1436aea4 | 355 | USBHC_MEM_BLOCK *Block;\r |
4b1bf81c | 356 | \r |
357 | ASSERT (Pool->Head != NULL);\r | |
358 | \r | |
359 | //\r | |
360 | // Unlink all the memory blocks from the pool, then free them.\r | |
4b1bf81c | 361 | //\r |
2c656af0 SZ |
362 | for (Block = Pool->Head->Next; Block != NULL; Block = Block->Next) {\r |
363 | UsbHcFreeMemBlock (Ehc, Pool, Block);\r | |
4b1bf81c | 364 | }\r |
365 | \r | |
2c656af0 | 366 | UsbHcFreeMemBlock (Ehc, Pool, Pool->Head);\r |
4b1bf81c | 367 | \r |
368 | return EFI_SUCCESS;\r | |
369 | }\r | |
370 | \r | |
371 | /**\r | |
372 | Allocate some memory from the host controller's memory pool\r | |
373 | which can be used to communicate with host controller.\r | |
d1102dba | 374 | \r |
4b1bf81c | 375 | @param Ehc The EHCI device.\r |
376 | @param Pool The host controller's memory pool.\r | |
377 | @param Size Size of the memory to allocate.\r | |
378 | \r | |
379 | @return The allocated memory or NULL.\r | |
380 | \r | |
381 | **/\r | |
382 | VOID *\r | |
383 | UsbHcAllocateMem (\r | |
1436aea4 MK |
384 | IN PEI_USB2_HC_DEV *Ehc,\r |
385 | IN USBHC_MEM_POOL *Pool,\r | |
386 | IN UINTN Size\r | |
4b1bf81c | 387 | )\r |
388 | {\r | |
1436aea4 MK |
389 | USBHC_MEM_BLOCK *Head;\r |
390 | USBHC_MEM_BLOCK *Block;\r | |
391 | USBHC_MEM_BLOCK *NewBlock;\r | |
392 | VOID *Mem;\r | |
393 | UINTN AllocSize;\r | |
394 | UINTN Pages;\r | |
4b1bf81c | 395 | \r |
396 | Mem = NULL;\r | |
397 | AllocSize = USBHC_MEM_ROUND (Size);\r | |
398 | Head = Pool->Head;\r | |
399 | ASSERT (Head != NULL);\r | |
400 | \r | |
401 | //\r | |
402 | // First check whether current memory blocks can satisfy the allocation.\r | |
403 | //\r | |
404 | for (Block = Head; Block != NULL; Block = Block->Next) {\r | |
405 | Mem = UsbHcAllocMemFromBlock (Block, AllocSize / USBHC_MEM_UNIT);\r | |
406 | \r | |
407 | if (Mem != NULL) {\r | |
408 | ZeroMem (Mem, Size);\r | |
409 | break;\r | |
410 | }\r | |
411 | }\r | |
412 | \r | |
413 | if (Mem != NULL) {\r | |
414 | return Mem;\r | |
415 | }\r | |
416 | \r | |
417 | //\r | |
418 | // Create a new memory block if there is not enough memory\r | |
419 | // in the pool. If the allocation size is larger than the\r | |
420 | // default page number, just allocate a large enough memory\r | |
421 | // block. Otherwise allocate default pages.\r | |
422 | //\r | |
423 | if (AllocSize > EFI_PAGES_TO_SIZE (USBHC_MEM_DEFAULT_PAGES)) {\r | |
424 | Pages = EFI_SIZE_TO_PAGES (AllocSize) + 1;\r | |
425 | } else {\r | |
426 | Pages = USBHC_MEM_DEFAULT_PAGES;\r | |
427 | }\r | |
1436aea4 MK |
428 | \r |
429 | NewBlock = UsbHcAllocMemBlock (Ehc, Pool, Pages);\r | |
4b1bf81c | 430 | \r |
431 | if (NewBlock == NULL) {\r | |
432 | return NULL;\r | |
433 | }\r | |
d1102dba | 434 | \r |
4b1bf81c | 435 | //\r |
436 | // Add the new memory block to the pool, then allocate memory from it\r | |
437 | //\r | |
438 | UsbHcInsertMemBlockToPool (Head, NewBlock);\r | |
439 | Mem = UsbHcAllocMemFromBlock (NewBlock, AllocSize / USBHC_MEM_UNIT);\r | |
440 | \r | |
441 | if (Mem != NULL) {\r | |
442 | ZeroMem (Mem, Size);\r | |
443 | }\r | |
444 | \r | |
445 | return Mem;\r | |
446 | }\r | |
447 | \r | |
448 | /**\r | |
449 | Free the allocated memory back to the memory pool.\r | |
450 | \r | |
2c656af0 | 451 | @param Ehc The EHCI device.\r |
4b1bf81c | 452 | @param Pool The memory pool of the host controller.\r |
453 | @param Mem The memory to free.\r | |
454 | @param Size The size of the memory to free.\r | |
455 | \r | |
456 | **/\r | |
457 | VOID\r | |
458 | UsbHcFreeMem (\r | |
1436aea4 MK |
459 | IN PEI_USB2_HC_DEV *Ehc,\r |
460 | IN USBHC_MEM_POOL *Pool,\r | |
461 | IN VOID *Mem,\r | |
462 | IN UINTN Size\r | |
4b1bf81c | 463 | )\r |
464 | {\r | |
1436aea4 MK |
465 | USBHC_MEM_BLOCK *Head;\r |
466 | USBHC_MEM_BLOCK *Block;\r | |
467 | UINT8 *ToFree;\r | |
468 | UINTN AllocSize;\r | |
469 | UINTN Byte;\r | |
470 | UINTN Bit;\r | |
471 | UINTN Count;\r | |
4b1bf81c | 472 | \r |
473 | Head = Pool->Head;\r | |
474 | AllocSize = USBHC_MEM_ROUND (Size);\r | |
1436aea4 | 475 | ToFree = (UINT8 *)Mem;\r |
4b1bf81c | 476 | \r |
477 | for (Block = Head; Block != NULL; Block = Block->Next) {\r | |
478 | //\r | |
479 | // scan the memory block list for the memory block that\r | |
480 | // completely contains the memory to free.\r | |
481 | //\r | |
482 | if ((Block->Buf <= ToFree) && ((ToFree + AllocSize) <= (Block->Buf + Block->BufLen))) {\r | |
483 | //\r | |
484 | // compute the start byte and bit in the bit array\r | |
485 | //\r | |
1436aea4 MK |
486 | Byte = ((ToFree - Block->Buf) / USBHC_MEM_UNIT) / 8;\r |
487 | Bit = ((ToFree - Block->Buf) / USBHC_MEM_UNIT) % 8;\r | |
4b1bf81c | 488 | \r |
489 | //\r | |
2048c585 | 490 | // reset associated bits in bit array\r |
4b1bf81c | 491 | //\r |
492 | for (Count = 0; Count < (AllocSize / USBHC_MEM_UNIT); Count++) {\r | |
493 | ASSERT (USB_HC_BIT_IS_SET (Block->Bits[Byte], Bit));\r | |
494 | \r | |
1436aea4 | 495 | Block->Bits[Byte] = (UINT8)(Block->Bits[Byte] ^ USB_HC_BIT (Bit));\r |
4b1bf81c | 496 | NEXT_BIT (Byte, Bit);\r |
497 | }\r | |
498 | \r | |
499 | break;\r | |
500 | }\r | |
501 | }\r | |
502 | \r | |
503 | //\r | |
504 | // If Block == NULL, it means that the current memory isn't\r | |
505 | // in the host controller's pool. This is critical because\r | |
506 | // the caller has passed in a wrong memory point\r | |
507 | //\r | |
508 | ASSERT (Block != NULL);\r | |
509 | \r | |
510 | //\r | |
511 | // Release the current memory block if it is empty and not the head\r | |
512 | //\r | |
513 | if ((Block != Head) && UsbHcIsMemBlockEmpty (Block)) {\r | |
2c656af0 | 514 | UsbHcFreeMemBlock (Ehc, Pool, Block);\r |
4b1bf81c | 515 | }\r |
516 | \r | |
1436aea4 | 517 | return;\r |
4b1bf81c | 518 | }\r |