| 1 | /*++\r |
| 2 | \r |
| 3 | Copyright (c) 2006, Intel Corporation \r |
| 4 | All rights reserved. This program and the accompanying materials \r |
| 5 | are licensed and made available under the terms and conditions of the BSD License \r |
| 6 | which accompanies this distribution. The full text of the license may be found at \r |
| 7 | http://opensource.org/licenses/bsd-license.php \r |
| 8 | \r |
| 9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r |
| 10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r |
| 11 | \r |
| 12 | Module Name:\r |
| 13 | \r |
| 14 | pool.c\r |
| 15 | \r |
| 16 | Abstract:\r |
| 17 | \r |
| 18 | EFI Memory pool management\r |
| 19 | \r |
| 20 | Revision History\r |
| 21 | \r |
| 22 | --*/\r |
| 23 | \r |
| 24 | #include <DxeMain.h>\r |
| 25 | \r |
| 26 | #define POOL_FREE_SIGNATURE EFI_SIGNATURE_32('p','f','r','0')\r |
| 27 | typedef struct {\r |
| 28 | UINT32 Signature;\r |
| 29 | UINT32 Index;\r |
| 30 | LIST_ENTRY Link;\r |
| 31 | } POOL_FREE;\r |
| 32 | \r |
| 33 | \r |
| 34 | #define POOL_HEAD_SIGNATURE EFI_SIGNATURE_32('p','h','d','0')\r |
| 35 | typedef struct {\r |
| 36 | UINT32 Signature;\r |
| 37 | UINT32 Size;\r |
| 38 | EFI_MEMORY_TYPE Type;\r |
| 39 | UINTN Reserved;\r |
| 40 | CHAR8 Data[1];\r |
| 41 | } POOL_HEAD;\r |
| 42 | \r |
| 43 | #define SIZE_OF_POOL_HEAD EFI_FIELD_OFFSET(POOL_HEAD,Data)\r |
| 44 | \r |
| 45 | #define POOL_TAIL_SIGNATURE EFI_SIGNATURE_32('p','t','a','l')\r |
| 46 | typedef struct {\r |
| 47 | UINT32 Signature;\r |
| 48 | UINT32 Size;\r |
| 49 | } POOL_TAIL;\r |
| 50 | \r |
| 51 | \r |
| 52 | #define POOL_SHIFT 7\r |
| 53 | \r |
| 54 | #define POOL_OVERHEAD (SIZE_OF_POOL_HEAD + sizeof(POOL_TAIL))\r |
| 55 | \r |
| 56 | #define HEAD_TO_TAIL(a) \\r |
| 57 | ((POOL_TAIL *) (((CHAR8 *) (a)) + (a)->Size - sizeof(POOL_TAIL)));\r |
| 58 | \r |
| 59 | \r |
| 60 | #define SIZE_TO_LIST(a) ((a) >> POOL_SHIFT)\r |
| 61 | #define LIST_TO_SIZE(a) ((a+1) << POOL_SHIFT)\r |
| 62 | \r |
| 63 | #define MAX_POOL_LIST SIZE_TO_LIST(DEFAULT_PAGE_ALLOCATION)\r |
| 64 | \r |
| 65 | #define MAX_POOL_SIZE (MAX_ADDRESS - POOL_OVERHEAD)\r |
| 66 | \r |
| 67 | //\r |
| 68 | // Globals\r |
| 69 | //\r |
| 70 | \r |
| 71 | #define POOL_SIGNATURE EFI_SIGNATURE_32('p','l','s','t')\r |
| 72 | typedef struct {\r |
| 73 | INTN Signature;\r |
| 74 | UINTN Used;\r |
| 75 | EFI_MEMORY_TYPE MemoryType;\r |
| 76 | LIST_ENTRY FreeList[MAX_POOL_LIST];\r |
| 77 | LIST_ENTRY Link;\r |
| 78 | } POOL; \r |
| 79 | \r |
| 80 | \r |
| 81 | POOL PoolHead[EfiMaxMemoryType];\r |
| 82 | LIST_ENTRY PoolHeadList;\r |
| 83 | \r |
| 84 | //\r |
| 85 | //\r |
| 86 | //\r |
| 87 | \r |
| 88 | VOID\r |
| 89 | CoreInitializePool (\r |
| 90 | VOID\r |
| 91 | )\r |
| 92 | /*++\r |
| 93 | \r |
| 94 | Routine Description:\r |
| 95 | \r |
| 96 | Called to initialize the pool.\r |
| 97 | \r |
| 98 | Arguments:\r |
| 99 | \r |
| 100 | None\r |
| 101 | \r |
| 102 | Returns:\r |
| 103 | \r |
| 104 | None\r |
| 105 | \r |
| 106 | --*/\r |
| 107 | {\r |
| 108 | UINTN Type;\r |
| 109 | UINTN Index;\r |
| 110 | \r |
| 111 | for (Type=0; Type < EfiMaxMemoryType; Type++) {\r |
| 112 | PoolHead[Type].Signature = 0;\r |
| 113 | PoolHead[Type].Used = 0;\r |
| 114 | PoolHead[Type].MemoryType = Type;\r |
| 115 | for (Index=0; Index < MAX_POOL_LIST; Index++) {\r |
| 116 | InitializeListHead (&PoolHead[Type].FreeList[Index]);\r |
| 117 | }\r |
| 118 | }\r |
| 119 | InitializeListHead (&PoolHeadList);\r |
| 120 | }\r |
| 121 | \r |
| 122 | \r |
| 123 | POOL *\r |
| 124 | LookupPoolHead (\r |
| 125 | IN EFI_MEMORY_TYPE MemoryType\r |
| 126 | )\r |
| 127 | /*++\r |
| 128 | \r |
| 129 | Routine Description:\r |
| 130 | \r |
| 131 | Look up pool head for specified memory type.\r |
| 132 | \r |
| 133 | Arguments:\r |
| 134 | \r |
| 135 | MemoryType - Memory type of which pool head is looked for\r |
| 136 | \r |
| 137 | Returns:\r |
| 138 | \r |
| 139 | Pointer of Corresponding pool head.\r |
| 140 | \r |
| 141 | --*/\r |
| 142 | {\r |
| 143 | LIST_ENTRY *Link;\r |
| 144 | POOL *Pool;\r |
| 145 | UINTN Index;\r |
| 146 | \r |
| 147 | if (MemoryType >= 0 && MemoryType < EfiMaxMemoryType) {\r |
| 148 | return &PoolHead[MemoryType];\r |
| 149 | }\r |
| 150 | \r |
| 151 | if (MemoryType < 0) {\r |
| 152 | \r |
| 153 | for (Link = PoolHeadList.ForwardLink; Link != &PoolHeadList; Link = Link->ForwardLink) {\r |
| 154 | Pool = CR(Link, POOL, Link, POOL_SIGNATURE);\r |
| 155 | if (Pool->MemoryType == MemoryType) {\r |
| 156 | return Pool;\r |
| 157 | }\r |
| 158 | }\r |
| 159 | \r |
| 160 | Pool = CoreAllocatePoolI (EfiBootServicesData, sizeof (POOL));\r |
| 161 | if (Pool == NULL) {\r |
| 162 | return NULL;\r |
| 163 | }\r |
| 164 | \r |
| 165 | Pool->Signature = POOL_SIGNATURE;\r |
| 166 | Pool->Used = 0;\r |
| 167 | Pool->MemoryType = MemoryType;\r |
| 168 | for (Index=0; Index < MAX_POOL_LIST; Index++) {\r |
| 169 | InitializeListHead (&Pool->FreeList[Index]);\r |
| 170 | }\r |
| 171 | \r |
| 172 | InsertHeadList (&PoolHeadList, &Pool->Link);\r |
| 173 | \r |
| 174 | return Pool;\r |
| 175 | }\r |
| 176 | \r |
| 177 | return NULL;\r |
| 178 | }\r |
| 179 | \r |
| 180 | \r |
| 181 | \r |
| 182 | EFI_STATUS\r |
| 183 | EFIAPI\r |
| 184 | CoreAllocatePool (\r |
| 185 | IN EFI_MEMORY_TYPE PoolType,\r |
| 186 | IN UINTN Size,\r |
| 187 | OUT VOID **Buffer\r |
| 188 | )\r |
| 189 | /*++\r |
| 190 | \r |
| 191 | Routine Description:\r |
| 192 | \r |
| 193 | Allocate pool of a particular type.\r |
| 194 | \r |
| 195 | Arguments:\r |
| 196 | \r |
| 197 | PoolType - Type of pool to allocate\r |
| 198 | \r |
| 199 | Size - The amount of pool to allocate\r |
| 200 | \r |
| 201 | Buffer - The address to return a pointer to the allocated pool\r |
| 202 | \r |
| 203 | Returns:\r |
| 204 | \r |
| 205 | EFI_INVALID_PARAMETER - PoolType not valid\r |
| 206 | \r |
| 207 | EFI_OUT_OF_RESOURCES - Size exceeds max pool size or allocation failed. \r |
| 208 | \r |
| 209 | EFI_SUCCESS - Pool successfully allocated.\r |
| 210 | \r |
| 211 | --*/\r |
| 212 | {\r |
| 213 | EFI_STATUS Status;\r |
| 214 | \r |
| 215 | //\r |
| 216 | // If it's not a valid type, fail it\r |
| 217 | //\r |
| 218 | if ((PoolType >= EfiMaxMemoryType && PoolType <= 0x7fffffff) ||\r |
| 219 | PoolType == EfiConventionalMemory) {\r |
| 220 | return EFI_INVALID_PARAMETER;\r |
| 221 | }\r |
| 222 | \r |
| 223 | *Buffer = NULL;\r |
| 224 | \r |
| 225 | //\r |
| 226 | // If size is too large, fail it\r |
| 227 | // Base on the EFI spec, return status of EFI_OUT_OF_RESOURCES\r |
| 228 | //\r |
| 229 | if (Size > MAX_POOL_SIZE) {\r |
| 230 | return EFI_OUT_OF_RESOURCES;\r |
| 231 | }\r |
| 232 | \r |
| 233 | //\r |
| 234 | // Acquire the memory lock and make the allocation\r |
| 235 | //\r |
| 236 | Status = CoreAcquireLockOrFail (&gMemoryLock);\r |
| 237 | if (EFI_ERROR (Status)) {\r |
| 238 | return EFI_OUT_OF_RESOURCES;\r |
| 239 | }\r |
| 240 | \r |
| 241 | *Buffer = CoreAllocatePoolI (PoolType, Size);\r |
| 242 | CoreReleaseMemoryLock ();\r |
| 243 | return (*Buffer != NULL) ? EFI_SUCCESS : EFI_OUT_OF_RESOURCES;\r |
| 244 | }\r |
| 245 | \r |
| 246 | \r |
| 247 | VOID *\r |
| 248 | CoreAllocatePoolI (\r |
| 249 | IN EFI_MEMORY_TYPE PoolType,\r |
| 250 | IN UINTN Size\r |
| 251 | )\r |
| 252 | /*++\r |
| 253 | \r |
| 254 | Routine Description:\r |
| 255 | \r |
| 256 | Internal function to allocate pool of a particular type.\r |
| 257 | \r |
| 258 | Caller must have the memory lock held\r |
| 259 | \r |
| 260 | \r |
| 261 | Arguments:\r |
| 262 | \r |
| 263 | PoolType - Type of pool to allocate\r |
| 264 | \r |
| 265 | Size - The amount of pool to allocate\r |
| 266 | \r |
| 267 | Returns:\r |
| 268 | \r |
| 269 | The allocate pool, or NULL\r |
| 270 | \r |
| 271 | --*/\r |
| 272 | {\r |
| 273 | POOL *Pool;\r |
| 274 | POOL_FREE *Free;\r |
| 275 | POOL_HEAD *Head;\r |
| 276 | POOL_TAIL *Tail;\r |
| 277 | CHAR8 *NewPage;\r |
| 278 | VOID *Buffer;\r |
| 279 | UINTN Index;\r |
| 280 | UINTN FSize;\r |
| 281 | UINTN offset;\r |
| 282 | UINTN Adjustment;\r |
| 283 | UINTN NoPages;\r |
| 284 | \r |
| 285 | ASSERT_LOCKED (&gMemoryLock);\r |
| 286 | \r |
| 287 | //\r |
| 288 | // Adjust the size by the pool header & tail overhead\r |
| 289 | //\r |
| 290 | \r |
| 291 | //\r |
| 292 | // Adjusting the Size to be of proper alignment so that\r |
| 293 | // we don't get an unaligned access fault later when\r |
| 294 | // pool_Tail is being initialized\r |
| 295 | //\r |
| 296 | ALIGN_VARIABLE (Size, Adjustment);\r |
| 297 | \r |
| 298 | Size += POOL_OVERHEAD;\r |
| 299 | Index = SIZE_TO_LIST(Size);\r |
| 300 | Pool = LookupPoolHead (PoolType);\r |
| 301 | if (Pool== NULL) {\r |
| 302 | return NULL;\r |
| 303 | }\r |
| 304 | Head = NULL;\r |
| 305 | \r |
| 306 | //\r |
| 307 | // If allocation is over max size, just allocate pages for the request\r |
| 308 | // (slow)\r |
| 309 | //\r |
| 310 | if (Index >= MAX_POOL_LIST) {\r |
| 311 | NoPages = EFI_SIZE_TO_PAGES(Size) + EFI_SIZE_TO_PAGES (DEFAULT_PAGE_ALLOCATION) - 1;\r |
| 312 | NoPages &= ~(EFI_SIZE_TO_PAGES (DEFAULT_PAGE_ALLOCATION) - 1);\r |
| 313 | Head = CoreAllocatePoolPages (PoolType, NoPages, DEFAULT_PAGE_ALLOCATION);\r |
| 314 | goto Done;\r |
| 315 | }\r |
| 316 | \r |
| 317 | //\r |
| 318 | // If there's no free pool in the proper list size, go get some more pages\r |
| 319 | //\r |
| 320 | if (IsListEmpty (&Pool->FreeList[Index])) {\r |
| 321 | \r |
| 322 | //\r |
| 323 | // Get another page\r |
| 324 | //\r |
| 325 | NewPage = CoreAllocatePoolPages(PoolType, EFI_SIZE_TO_PAGES (DEFAULT_PAGE_ALLOCATION), DEFAULT_PAGE_ALLOCATION);\r |
| 326 | if (NewPage == NULL) {\r |
| 327 | goto Done;\r |
| 328 | }\r |
| 329 | \r |
| 330 | //\r |
| 331 | // Carve up new page into free pool blocks\r |
| 332 | //\r |
| 333 | offset = 0;\r |
| 334 | while (offset < DEFAULT_PAGE_ALLOCATION) {\r |
| 335 | ASSERT (Index < MAX_POOL_LIST);\r |
| 336 | FSize = LIST_TO_SIZE(Index);\r |
| 337 | \r |
| 338 | while (offset + FSize <= DEFAULT_PAGE_ALLOCATION) {\r |
| 339 | Free = (POOL_FREE *) &NewPage[offset]; \r |
| 340 | Free->Signature = POOL_FREE_SIGNATURE;\r |
| 341 | Free->Index = (UINT32)Index;\r |
| 342 | InsertHeadList (&Pool->FreeList[Index], &Free->Link);\r |
| 343 | offset += FSize;\r |
| 344 | }\r |
| 345 | \r |
| 346 | Index -= 1;\r |
| 347 | }\r |
| 348 | \r |
| 349 | ASSERT (offset == DEFAULT_PAGE_ALLOCATION);\r |
| 350 | Index = SIZE_TO_LIST(Size);\r |
| 351 | }\r |
| 352 | \r |
| 353 | //\r |
| 354 | // Remove entry from free pool list\r |
| 355 | //\r |
| 356 | Free = CR (Pool->FreeList[Index].ForwardLink, POOL_FREE, Link, POOL_FREE_SIGNATURE);\r |
| 357 | RemoveEntryList (&Free->Link);\r |
| 358 | \r |
| 359 | Head = (POOL_HEAD *) Free;\r |
| 360 | \r |
| 361 | Done:\r |
| 362 | Buffer = NULL;\r |
| 363 | \r |
| 364 | if (Head != NULL) {\r |
| 365 | \r |
| 366 | //\r |
| 367 | // If we have a pool buffer, fill in the header & tail info\r |
| 368 | //\r |
| 369 | Head->Signature = POOL_HEAD_SIGNATURE;\r |
| 370 | Head->Size = (UINT32) Size;\r |
| 371 | Head->Type = (EFI_MEMORY_TYPE) PoolType;\r |
| 372 | Tail = HEAD_TO_TAIL (Head);\r |
| 373 | Tail->Signature = POOL_TAIL_SIGNATURE;\r |
| 374 | Tail->Size = (UINT32) Size;\r |
| 375 | Buffer = Head->Data;\r |
| 376 | DEBUG_CLEAR_MEMORY (Buffer, Size - POOL_OVERHEAD);\r |
| 377 | \r |
| 378 | DEBUG (\r |
| 379 | (EFI_D_POOL,\r |
| 380 | "AllcocatePoolI: Type %x, Addr %x (len %x) %,d\n",\r |
| 381 | PoolType, \r |
| 382 | Buffer, \r |
| 383 | Size - POOL_OVERHEAD, \r |
| 384 | Pool->Used)\r |
| 385 | );\r |
| 386 | \r |
| 387 | //\r |
| 388 | // Account the allocation\r |
| 389 | //\r |
| 390 | Pool->Used += Size;\r |
| 391 | \r |
| 392 | } else {\r |
| 393 | DEBUG ((EFI_D_ERROR | EFI_D_POOL, "AllocatePool: failed to allocate %d bytes\n", Size));\r |
| 394 | }\r |
| 395 | \r |
| 396 | return Buffer;\r |
| 397 | }\r |
| 398 | \r |
| 399 | \r |
| 400 | \r |
| 401 | EFI_STATUS\r |
| 402 | EFIAPI\r |
| 403 | CoreFreePool (\r |
| 404 | IN VOID *Buffer\r |
| 405 | )\r |
| 406 | /*++\r |
| 407 | \r |
| 408 | Routine Description:\r |
| 409 | \r |
| 410 | Frees pool.\r |
| 411 | \r |
| 412 | Arguments:\r |
| 413 | \r |
| 414 | Buffer - The allocated pool entry to free\r |
| 415 | \r |
| 416 | Returns:\r |
| 417 | \r |
| 418 | EFI_INVALID_PARAMETER - Buffer is not a valid value.\r |
| 419 | \r |
| 420 | EFI_SUCCESS - Pool successfully freed.\r |
| 421 | \r |
| 422 | --*/\r |
| 423 | {\r |
| 424 | EFI_STATUS Status;\r |
| 425 | \r |
| 426 | if (NULL == Buffer) {\r |
| 427 | return EFI_INVALID_PARAMETER;\r |
| 428 | }\r |
| 429 | \r |
| 430 | CoreAcquireMemoryLock ();\r |
| 431 | Status = CoreFreePoolI (Buffer);\r |
| 432 | CoreReleaseMemoryLock ();\r |
| 433 | return Status;\r |
| 434 | }\r |
| 435 | \r |
| 436 | \r |
| 437 | EFI_STATUS\r |
| 438 | CoreFreePoolI (\r |
| 439 | IN VOID *Buffer\r |
| 440 | )\r |
| 441 | /*++\r |
| 442 | \r |
| 443 | Routine Description:\r |
| 444 | \r |
| 445 | Internal function to free a pool entry.\r |
| 446 | \r |
| 447 | Caller must have the memory lock held\r |
| 448 | \r |
| 449 | \r |
| 450 | Arguments:\r |
| 451 | \r |
| 452 | Buffer - The allocated pool entry to free\r |
| 453 | \r |
| 454 | Returns:\r |
| 455 | \r |
| 456 | EFI_INVALID_PARAMETER - Buffer not valid\r |
| 457 | \r |
| 458 | EFI_SUCCESS - Buffer successfully freed.\r |
| 459 | \r |
| 460 | --*/\r |
| 461 | {\r |
| 462 | POOL *Pool;\r |
| 463 | POOL_HEAD *Head;\r |
| 464 | POOL_TAIL *Tail;\r |
| 465 | POOL_FREE *Free;\r |
| 466 | UINTN Index;\r |
| 467 | UINTN NoPages;\r |
| 468 | UINTN Size;\r |
| 469 | CHAR8 *NewPage;\r |
| 470 | UINTN FSize;\r |
| 471 | UINTN offset;\r |
| 472 | BOOLEAN AllFree;\r |
| 473 | \r |
| 474 | ASSERT(NULL != Buffer);\r |
| 475 | //\r |
| 476 | // Get the head & tail of the pool entry\r |
| 477 | //\r |
| 478 | Head = CR (Buffer, POOL_HEAD, Data, POOL_HEAD_SIGNATURE);\r |
| 479 | ASSERT(NULL != Head);\r |
| 480 | \r |
| 481 | if (Head->Signature != POOL_HEAD_SIGNATURE) {\r |
| 482 | return EFI_INVALID_PARAMETER;\r |
| 483 | }\r |
| 484 | \r |
| 485 | Tail = HEAD_TO_TAIL (Head);\r |
| 486 | ASSERT(NULL != Tail);\r |
| 487 | \r |
| 488 | //\r |
| 489 | // Debug\r |
| 490 | //\r |
| 491 | ASSERT (Tail->Signature == POOL_TAIL_SIGNATURE);\r |
| 492 | ASSERT (Head->Size == Tail->Size);\r |
| 493 | ASSERT_LOCKED (&gMemoryLock);\r |
| 494 | \r |
| 495 | if (Tail->Signature != POOL_TAIL_SIGNATURE) {\r |
| 496 | return EFI_INVALID_PARAMETER;\r |
| 497 | }\r |
| 498 | \r |
| 499 | if (Head->Size != Tail->Size) {\r |
| 500 | return EFI_INVALID_PARAMETER;\r |
| 501 | }\r |
| 502 | \r |
| 503 | //\r |
| 504 | // Determine the pool type and account for it\r |
| 505 | //\r |
| 506 | Size = Head->Size;\r |
| 507 | Pool = LookupPoolHead (Head->Type);\r |
| 508 | if (Pool == NULL) {\r |
| 509 | return EFI_INVALID_PARAMETER;\r |
| 510 | }\r |
| 511 | Pool->Used -= Size;\r |
| 512 | DEBUG ((EFI_D_POOL, "FreePool: %x (len %x) %,d\n", Head->Data, Head->Size - POOL_OVERHEAD, Pool->Used));\r |
| 513 | \r |
| 514 | //\r |
| 515 | // Determine the pool list \r |
| 516 | //\r |
| 517 | Index = SIZE_TO_LIST(Size);\r |
| 518 | DEBUG_CLEAR_MEMORY (Head, Size);\r |
| 519 | \r |
| 520 | //\r |
| 521 | // If it's not on the list, it must be pool pages\r |
| 522 | //\r |
| 523 | if (Index >= MAX_POOL_LIST) {\r |
| 524 | \r |
| 525 | //\r |
| 526 | // Return the memory pages back to free memory\r |
| 527 | //\r |
| 528 | NoPages = EFI_SIZE_TO_PAGES(Size) + EFI_SIZE_TO_PAGES (DEFAULT_PAGE_ALLOCATION) - 1;\r |
| 529 | NoPages &= ~(EFI_SIZE_TO_PAGES (DEFAULT_PAGE_ALLOCATION) - 1);\r |
| 530 | CoreFreePoolPages ((EFI_PHYSICAL_ADDRESS) (UINTN) Head, NoPages);\r |
| 531 | \r |
| 532 | } else {\r |
| 533 | \r |
| 534 | //\r |
| 535 | // Put the pool entry onto the free pool list\r |
| 536 | //\r |
| 537 | Free = (POOL_FREE *) Head;\r |
| 538 | ASSERT(NULL != Free);\r |
| 539 | Free->Signature = POOL_FREE_SIGNATURE;\r |
| 540 | Free->Index = (UINT32)Index;\r |
| 541 | InsertHeadList (&Pool->FreeList[Index], &Free->Link);\r |
| 542 | \r |
| 543 | //\r |
| 544 | // See if all the pool entries in the same page as Free are freed pool \r |
| 545 | // entries\r |
| 546 | //\r |
| 547 | NewPage = (CHAR8 *)((UINTN)Free & ~((DEFAULT_PAGE_ALLOCATION) -1));\r |
| 548 | Free = (POOL_FREE *) &NewPage[0];\r |
| 549 | ASSERT(NULL != Free);\r |
| 550 | \r |
| 551 | if (Free->Signature == POOL_FREE_SIGNATURE) {\r |
| 552 | \r |
| 553 | Index = Free->Index;\r |
| 554 | \r |
| 555 | AllFree = TRUE;\r |
| 556 | offset = 0;\r |
| 557 | \r |
| 558 | while ((offset < DEFAULT_PAGE_ALLOCATION) && (AllFree)) {\r |
| 559 | FSize = LIST_TO_SIZE(Index);\r |
| 560 | while (offset + FSize <= DEFAULT_PAGE_ALLOCATION) {\r |
| 561 | Free = (POOL_FREE *) &NewPage[offset];\r |
| 562 | ASSERT(NULL != Free);\r |
| 563 | if (Free->Signature != POOL_FREE_SIGNATURE) {\r |
| 564 | AllFree = FALSE;\r |
| 565 | }\r |
| 566 | offset += FSize;\r |
| 567 | }\r |
| 568 | Index -= 1;\r |
| 569 | }\r |
| 570 | \r |
| 571 | if (AllFree) {\r |
| 572 | \r |
| 573 | //\r |
| 574 | // All of the pool entries in the same page as Free are free pool \r |
| 575 | // entries\r |
| 576 | // Remove all of these pool entries from the free loop lists.\r |
| 577 | //\r |
| 578 | Free = (POOL_FREE *) &NewPage[0];\r |
| 579 | ASSERT(NULL != Free);\r |
| 580 | Index = Free->Index;\r |
| 581 | offset = 0;\r |
| 582 | \r |
| 583 | while (offset < DEFAULT_PAGE_ALLOCATION) {\r |
| 584 | FSize = LIST_TO_SIZE(Index);\r |
| 585 | while (offset + FSize <= DEFAULT_PAGE_ALLOCATION) {\r |
| 586 | Free = (POOL_FREE *) &NewPage[offset];\r |
| 587 | ASSERT(NULL != Free);\r |
| 588 | RemoveEntryList (&Free->Link);\r |
| 589 | offset += FSize;\r |
| 590 | }\r |
| 591 | Index -= 1;\r |
| 592 | }\r |
| 593 | \r |
| 594 | //\r |
| 595 | // Free the page\r |
| 596 | //\r |
| 597 | CoreFreePoolPages ((EFI_PHYSICAL_ADDRESS) (UINTN)NewPage, EFI_SIZE_TO_PAGES (DEFAULT_PAGE_ALLOCATION));\r |
| 598 | }\r |
| 599 | }\r |
| 600 | }\r |
| 601 | \r |
| 602 | //\r |
| 603 | // If this is an OS specific memory type, then check to see if the last \r |
| 604 | // portion of that memory type has been freed. If it has, then free the\r |
| 605 | // list entry for that memory type\r |
| 606 | //\r |
| 607 | if (Pool->MemoryType < 0 && Pool->Used == 0) {\r |
| 608 | RemoveEntryList (&Pool->Link);\r |
| 609 | CoreFreePoolI (Pool);\r |
| 610 | }\r |
| 611 | \r |
| 612 | return EFI_SUCCESS;\r |
| 613 | }\r |