1/****************************************************************************** 2 * 3 * Module Name: tbxfroot - Find the root ACPI table (RSDT)
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4 * $Revision: 72 $
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4 * $Revision: 73 $ |
5 * 6 *****************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2004, Intel Corp. 13 * All rights reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial portion of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 * 67 * 3.3. Redistribution of Executable. Redistribution in executable form of any 68 * substantial portion of the Covered Code or modification must reproduce the 69 * above Copyright Notice, and the following Disclaimer and Export Compliance 70 * provision in the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3.4. Intel retains all right, title, and interest in and to the Original 74 * Intel Code. 75 * 76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77 * Intel shall be used in advertising or otherwise to promote the sale, use or 78 * other dealings in products derived from or relating to the Covered Code 79 * without prior written authorization from Intel. 80 * 81 * 4. Disclaimer and Export Compliance 82 * 83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89 * PARTICULAR PURPOSE. 90 * 91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98 * LIMITED REMEDY. 99 * 100 * 4.3. Licensee shall not export, either directly or indirectly, any of this 101 * software or system incorporating such software without first obtaining any 102 * required license or other approval from the U. S. Department of Commerce or 103 * any other agency or department of the United States Government. In the 104 * event Licensee exports any such software from the United States or 105 * re-exports any such software from a foreign destination, Licensee shall 106 * ensure that the distribution and export/re-export of the software is in 107 * compliance with all laws, regulations, orders, or other restrictions of the 108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109 * any of its subsidiaries will export/re-export any technical data, process, 110 * software, or service, directly or indirectly, to any country for which the 111 * United States government or any agency thereof requires an export license, 112 * other governmental approval, or letter of assurance, without first obtaining 113 * such license, approval or letter. 114 * 115 *****************************************************************************/ 116 117#define __TBXFROOT_C__ 118 119#include "acpi.h" 120#include "actables.h" 121 122 123#define _COMPONENT ACPI_TABLES 124 ACPI_MODULE_NAME ("tbxfroot") 125 126 127/******************************************************************************* 128 * 129 * FUNCTION: AcpiTbFindTable 130 * 131 * PARAMETERS: Signature - String with ACPI table signature 132 * OemId - String with the table OEM ID 133 * OemTableId - String with the OEM Table ID. 134 * 135 * RETURN: Status 136 * 137 * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the 138 * Signature, OEM ID and OEM Table ID. 139 * 140 ******************************************************************************/ 141 142ACPI_STATUS 143AcpiTbFindTable ( 144 char *Signature, 145 char *OemId, 146 char *OemTableId, 147 ACPI_TABLE_HEADER **TablePtr) 148{ 149 ACPI_STATUS Status; 150 ACPI_TABLE_HEADER *Table; 151 152 153 ACPI_FUNCTION_TRACE ("TbFindTable"); 154 155 156 /* Validate string lengths */ 157 158 if ((ACPI_STRLEN (Signature) > ACPI_NAME_SIZE) || 159 (ACPI_STRLEN (OemId) > sizeof (Table->OemId)) || 160 (ACPI_STRLEN (OemTableId) > sizeof (Table->OemTableId))) 161 { 162 return_ACPI_STATUS (AE_AML_STRING_LIMIT); 163 } 164 165 /* Find the table */ 166 167 Status = AcpiGetFirmwareTable (Signature, 1, 168 ACPI_LOGICAL_ADDRESSING, &Table); 169 if (ACPI_FAILURE (Status)) 170 { 171 return_ACPI_STATUS (Status); 172 } 173 174 /* Check OemId and OemTableId */ 175 176 if ((OemId[0] && ACPI_STRCMP (OemId, Table->OemId)) || 177 (OemTableId[0] && ACPI_STRCMP (OemTableId, Table->OemTableId))) 178 { 179 return_ACPI_STATUS (AE_AML_NAME_NOT_FOUND); 180 } 181 182 *TablePtr = Table; 183 return_ACPI_STATUS (AE_OK); 184} 185 186 187/******************************************************************************* 188 * 189 * FUNCTION: AcpiGetFirmwareTable 190 * 191 * PARAMETERS: Signature - Any ACPI table signature 192 * Instance - the non zero instance of the table, allows 193 * support for multiple tables of the same type 194 * Flags - Physical/Virtual support 195 * RetBuffer - pointer to a structure containing a buffer to 196 * receive the table 197 * 198 * RETURN: Status 199 * 200 * DESCRIPTION: This function is called to get an ACPI table. The caller 201 * supplies an OutBuffer large enough to contain the entire ACPI 202 * table. Upon completion 203 * the OutBuffer->Length field will indicate the number of bytes 204 * copied into the OutBuffer->BufPtr buffer. This table will be 205 * a complete table including the header. 206 * 207 ******************************************************************************/ 208 209ACPI_STATUS 210AcpiGetFirmwareTable ( 211 ACPI_STRING Signature, 212 UINT32 Instance, 213 UINT32 Flags, 214 ACPI_TABLE_HEADER **TablePointer) 215{ 216 ACPI_POINTER RsdpAddress; 217 ACPI_POINTER Address; 218 ACPI_STATUS Status; 219 ACPI_TABLE_HEADER Header; 220 ACPI_TABLE_DESC TableInfo; 221 ACPI_TABLE_DESC RsdtInfo; 222 UINT32 TableCount; 223 UINT32 i; 224 UINT32 j; 225 226 227 ACPI_FUNCTION_TRACE ("AcpiGetFirmwareTable"); 228 229 230 /* 231 * Ensure that at least the table manager is initialized. We don't 232 * require that the entire ACPI subsystem is up for this interface 233 */ 234 235 /* 236 * If we have a buffer, we must have a length too 237 */ 238 if ((Instance == 0) || 239 (!Signature) || 240 (!TablePointer)) 241 { 242 return_ACPI_STATUS (AE_BAD_PARAMETER); 243 } 244 245 RsdtInfo.Pointer = NULL; 246 247 if (!AcpiGbl_RSDP) 248 { 249 /* Get the RSDP */ 250 251 Status = AcpiOsGetRootPointer (Flags, &RsdpAddress); 252 if (ACPI_FAILURE (Status)) 253 { 254 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "RSDP not found\n")); 255 return_ACPI_STATUS (AE_NO_ACPI_TABLES); 256 } 257 258 /* Map and validate the RSDP */ 259 260 if ((Flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) 261 { 262 Status = AcpiOsMapMemory (RsdpAddress.Pointer.Physical, sizeof (RSDP_DESCRIPTOR), 263 (void *) &AcpiGbl_RSDP); 264 if (ACPI_FAILURE (Status)) 265 { 266 return_ACPI_STATUS (Status); 267 } 268 } 269 else 270 { 271 AcpiGbl_RSDP = RsdpAddress.Pointer.Logical; 272 } 273 274 /* 275 * The signature and checksum must both be correct 276 */ 277 if (ACPI_STRNCMP ((char *) AcpiGbl_RSDP, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) 278 { 279 /* Nope, BAD Signature */ 280 281 return_ACPI_STATUS (AE_BAD_SIGNATURE); 282 } 283 284 if (AcpiTbChecksum (AcpiGbl_RSDP, ACPI_RSDP_CHECKSUM_LENGTH) != 0) 285 { 286 /* Nope, BAD Checksum */ 287 288 return_ACPI_STATUS (AE_BAD_CHECKSUM); 289 } 290 } 291 292 /* Get the RSDT and validate it */ 293 294 AcpiTbGetRsdtAddress (&Address); 295 296 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 297 "RSDP located at %p, RSDT physical=%8.8X%8.8X \n", 298 AcpiGbl_RSDP, 299 ACPI_FORMAT_UINT64 (Address.Pointer.Value))); 300 301 /* Insert ProcessorMode flags */ 302 303 Address.PointerType |= Flags; 304 305 Status = AcpiTbGetTable (&Address, &RsdtInfo); 306 if (ACPI_FAILURE (Status)) 307 { 308 return_ACPI_STATUS (Status); 309 } 310 311 Status = AcpiTbValidateRsdt (RsdtInfo.Pointer); 312 if (ACPI_FAILURE (Status)) 313 { 314 goto Cleanup; 315 } 316 317 /* Get the number of table pointers within the RSDT */ 318 319 TableCount = AcpiTbGetTableCount (AcpiGbl_RSDP, RsdtInfo.Pointer); 320 321 Address.PointerType = AcpiGbl_TableFlags | Flags; 322 323 /* 324 * Search the RSDT/XSDT for the correct instance of the 325 * requested table 326 */ 327 for (i = 0, j = 0; i < TableCount; i++) 328 { 329 /* Get the next table pointer, handle RSDT vs. XSDT */ 330 331 if (AcpiGbl_RSDP->Revision < 2) 332 { 333 Address.Pointer.Value = (ACPI_CAST_PTR (RSDT_DESCRIPTOR, RsdtInfo.Pointer))->TableOffsetEntry[i]; 334 } 335 else 336 { 337 Address.Pointer.Value = ACPI_GET_ADDRESS ( 338 (ACPI_CAST_PTR (XSDT_DESCRIPTOR, RsdtInfo.Pointer))->TableOffsetEntry[i]); 339 } 340 341 /* Get the table header */ 342 343 Status = AcpiTbGetTableHeader (&Address, &Header); 344 if (ACPI_FAILURE (Status)) 345 { 346 goto Cleanup; 347 } 348 349 /* Compare table signatures and table instance */ 350 351 if (!ACPI_STRNCMP (Header.Signature, Signature, ACPI_NAME_SIZE)) 352 { 353 /* An instance of the table was found */ 354 355 j++; 356 if (j >= Instance) 357 { 358 /* Found the correct instance, get the entire table */ 359 360 Status = AcpiTbGetTableBody (&Address, &Header, &TableInfo); 361 if (ACPI_FAILURE (Status)) 362 { 363 goto Cleanup; 364 } 365 366 *TablePointer = TableInfo.Pointer; 367 goto Cleanup; 368 } 369 } 370 } 371 372 /* Did not find the table */ 373 374 Status = AE_NOT_EXIST; 375 376 377Cleanup: 378 AcpiOsUnmapMemory (RsdtInfo.Pointer, (ACPI_SIZE) RsdtInfo.Pointer->Length); 379 return_ACPI_STATUS (Status); 380} 381 382 383/* TBD: Move to a new file */ 384 385#if ACPI_MACHINE_WIDTH != 16 386 387/******************************************************************************* 388 * 389 * FUNCTION: AcpiFindRootPointer 390 * 391 * PARAMETERS: **RsdpAddress - Where to place the RSDP address 392 * Flags - Logical/Physical addressing 393 * 394 * RETURN: Status, Physical address of the RSDP 395 * 396 * DESCRIPTION: Find the RSDP 397 * 398 ******************************************************************************/ 399 400ACPI_STATUS 401AcpiFindRootPointer ( 402 UINT32 Flags, 403 ACPI_POINTER *RsdpAddress) 404{ 405 ACPI_TABLE_DESC TableInfo; 406 ACPI_STATUS Status; 407 408 409 ACPI_FUNCTION_TRACE ("AcpiFindRootPointer"); 410 411 412 /* Get the RSDP */ 413 414 Status = AcpiTbFindRsdp (&TableInfo, Flags); 415 if (ACPI_FAILURE (Status)) 416 { 417 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "RSDP structure not found, %s Flags=%X\n", 418 AcpiFormatException (Status), Flags)); 419 return_ACPI_STATUS (AE_NO_ACPI_TABLES); 420 } 421 422 RsdpAddress->PointerType = ACPI_PHYSICAL_POINTER; 423 RsdpAddress->Pointer.Physical = TableInfo.PhysicalAddress; 424 return_ACPI_STATUS (AE_OK); 425} 426 427 428/******************************************************************************* 429 * 430 * FUNCTION: AcpiTbScanMemoryForRsdp 431 * 432 * PARAMETERS: StartAddress - Starting pointer for search 433 * Length - Maximum length to search 434 * 435 * RETURN: Pointer to the RSDP if found, otherwise NULL. 436 * 437 * DESCRIPTION: Search a block of memory for the RSDP signature 438 * 439 ******************************************************************************/ 440 441UINT8 * 442AcpiTbScanMemoryForRsdp ( 443 UINT8 *StartAddress, 444 UINT32 Length) 445{ 446 UINT32 Offset; 447 UINT8 *MemRover; 448 449 450 ACPI_FUNCTION_TRACE ("TbScanMemoryForRsdp"); 451 452 453 /* Search from given start addr for the requested length */ 454 455 for (Offset = 0, MemRover = StartAddress; 456 Offset < Length; 457 Offset += ACPI_RSDP_SCAN_STEP, MemRover += ACPI_RSDP_SCAN_STEP) 458 { 459 460 /* The signature and checksum must both be correct */ 461 462 if (ACPI_STRNCMP ((char *) MemRover, 463 RSDP_SIG, sizeof (RSDP_SIG)-1) == 0 && 464 AcpiTbChecksum (MemRover, ACPI_RSDP_CHECKSUM_LENGTH) == 0) 465 { 466 /* If so, we have found the RSDP */ 467 468 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 469 "RSDP located at physical address %p\n",MemRover)); 470 return_PTR (MemRover); 471 } 472 } 473 474 /* Searched entire block, no RSDP was found */ 475 476 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,"Searched entire block, no RSDP was found.\n")); 477 return_PTR (NULL); 478} 479 480 481/******************************************************************************* 482 * 483 * FUNCTION: AcpiTbFindRsdp 484 * 485 * PARAMETERS: *TableInfo - Where the table info is returned 486 * Flags - Current memory mode (logical vs. 487 * physical addressing) 488 *
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489 * RETURN: Status
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489 * RETURN: Status, RSDP physical address |
490 * 491 * DESCRIPTION: Search lower 1Mbyte of memory for the root system descriptor 492 * pointer structure. If it is found, set *RSDP to point to it. 493 *
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494 * NOTE: The RSDP must be either in the first 1K of the Extended
495 * BIOS Data Area or between E0000 and FFFFF (ACPI 1.0 section
496 * 5.2.2; assertion #421).
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494 * NOTE1: The RSDP must be either in the first 1K of the Extended 495 * BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.) 496 * Only a 32-bit physical address is necessary. |
497 *
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498 * NOTE2: This function is always available, regardless of the 499 * initialization state of the rest of ACPI. 500 * |
501 ******************************************************************************/ 502 503ACPI_STATUS 504AcpiTbFindRsdp ( 505 ACPI_TABLE_DESC *TableInfo, 506 UINT32 Flags) 507{ 508 UINT8 *TablePtr; 509 UINT8 *MemRover;
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507 UINT64 PhysAddr;
508 ACPI_STATUS Status = AE_OK;
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510 UINT32 PhysicalAddress; 511 ACPI_STATUS Status; |
512 513 514 ACPI_FUNCTION_TRACE ("TbFindRsdp"); 515 516 517 /* 518 * Scan supports either 1) Logical addressing or 2) Physical addressing 519 */ 520 if ((Flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) 521 { 522 /*
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520 * 1) Search EBDA (low memory) paragraphs
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523 * 1a) Get the location of the EBDA |
524 */
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522 Status = AcpiOsMapMemory ((UINT64) ACPI_LO_RSDP_WINDOW_BASE, ACPI_LO_RSDP_WINDOW_SIZE,
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525 Status = AcpiOsMapMemory ((ACPI_PHYSICAL_ADDRESS) ACPI_EBDA_PTR_LOCATION, 526 ACPI_EBDA_PTR_LENGTH, |
527 (void *) &TablePtr); 528 if (ACPI_FAILURE (Status)) 529 {
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526 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %X for length %X\n",
527 ACPI_LO_RSDP_WINDOW_BASE, ACPI_LO_RSDP_WINDOW_SIZE));
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530 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %8.8X for length %X\n", 531 ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH)); |
532 return_ACPI_STATUS (Status); 533 } 534
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531 MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_LO_RSDP_WINDOW_SIZE);
532 AcpiOsUnmapMemory (TablePtr, ACPI_LO_RSDP_WINDOW_SIZE);
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535 ACPI_MOVE_16_TO_32 (&PhysicalAddress, TablePtr); 536 PhysicalAddress <<= 4; /* Convert segment to physical address */ 537 AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_PTR_LENGTH); |
538
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534 if (MemRover)
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539 /* EBDA present? */ 540 541 if (PhysicalAddress > 0x400) |
542 {
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536 /* Found it, return the physical address */
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543 /* 544 * 1b) Search EBDA paragraphs (EBDA is required to be a minimum of 1K length) 545 */ 546 Status = AcpiOsMapMemory ((ACPI_PHYSICAL_ADDRESS) PhysicalAddress, 547 ACPI_EBDA_WINDOW_SIZE, 548 (void *) &TablePtr); 549 if (ACPI_FAILURE (Status)) 550 { 551 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %8.8X for length %X\n", 552 PhysicalAddress, ACPI_EBDA_WINDOW_SIZE)); 553 return_ACPI_STATUS (Status); 554 } |
555
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538 PhysAddr = ACPI_LO_RSDP_WINDOW_BASE;
539 PhysAddr += ACPI_PTR_DIFF (MemRover,TablePtr);
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556 MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_EBDA_WINDOW_SIZE); 557 AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_WINDOW_SIZE); |
558
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541 TableInfo->PhysicalAddress = PhysAddr;
542 return_ACPI_STATUS (AE_OK);
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559 if (MemRover) 560 { 561 /* Found it, return the physical address */ 562 563 PhysicalAddress += ACPI_PTR_DIFF (MemRover, TablePtr); 564 565 TableInfo->PhysicalAddress = (ACPI_PHYSICAL_ADDRESS) PhysicalAddress; 566 return_ACPI_STATUS (AE_OK); 567 } |
568 } 569 570 /*
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546 * 2) Search upper memory: 16-byte boundaries in E0000h-F0000h
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571 * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh |
572 */
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548 Status = AcpiOsMapMemory ((UINT64) ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE,
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573 Status = AcpiOsMapMemory ((ACPI_PHYSICAL_ADDRESS) ACPI_HI_RSDP_WINDOW_BASE, 574 ACPI_HI_RSDP_WINDOW_SIZE, |
575 (void *) &TablePtr); 576 if (ACPI_FAILURE (Status)) 577 {
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552 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %X for length %X\n",
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578 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %8.8X for length %X\n", |
579 ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE)); 580 return_ACPI_STATUS (Status); 581 } 582 583 MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE); 584 AcpiOsUnmapMemory (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE); 585 586 if (MemRover) 587 { 588 /* Found it, return the physical address */ 589
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564 PhysAddr = ACPI_HI_RSDP_WINDOW_BASE;
565 PhysAddr += ACPI_PTR_DIFF (MemRover, TablePtr);
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590 PhysicalAddress = ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (MemRover, TablePtr); |
591
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567 TableInfo->PhysicalAddress = PhysAddr;
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592 TableInfo->PhysicalAddress = (ACPI_PHYSICAL_ADDRESS) PhysicalAddress; |
593 return_ACPI_STATUS (AE_OK); 594 } 595 } 596 597 /* 598 * Physical addressing 599 */ 600 else 601 { 602 /*
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578 * 1) Search EBDA (low memory) paragraphs
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603 * 1a) Get the location of the EBDA |
604 */
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580 MemRover = AcpiTbScanMemoryForRsdp (ACPI_PHYSADDR_TO_PTR (ACPI_LO_RSDP_WINDOW_BASE),
581 ACPI_LO_RSDP_WINDOW_SIZE);
582 if (MemRover)
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605 ACPI_MOVE_16_TO_32 (&PhysicalAddress, ACPI_EBDA_PTR_LOCATION); 606 PhysicalAddress <<= 4; /* Convert segment to physical address */ 607 608 /* EBDA present? */ 609 610 if (PhysicalAddress > 0x400) |
611 {
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584 /* Found it, return the physical address */
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612 /* 613 * 1b) Search EBDA paragraphs (EBDA is required to be a minimum of 1K length) 614 */ 615 MemRover = AcpiTbScanMemoryForRsdp (ACPI_PHYSADDR_TO_PTR (PhysicalAddress), 616 ACPI_EBDA_WINDOW_SIZE); 617 if (MemRover) 618 { 619 /* Found it, return the physical address */ |
620
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586 TableInfo->PhysicalAddress = ACPI_TO_INTEGER (MemRover);
587 return_ACPI_STATUS (AE_OK);
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621 TableInfo->PhysicalAddress = ACPI_TO_INTEGER (MemRover); 622 return_ACPI_STATUS (AE_OK); 623 } |
624 } 625 626 /*
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591 * 2) Search upper memory: 16-byte boundaries in E0000h-F0000h
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627 * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh |
628 */ 629 MemRover = AcpiTbScanMemoryForRsdp (ACPI_PHYSADDR_TO_PTR (ACPI_HI_RSDP_WINDOW_BASE), 630 ACPI_HI_RSDP_WINDOW_SIZE); 631 if (MemRover) 632 { 633 /* Found it, return the physical address */ 634 635 TableInfo->PhysicalAddress = ACPI_TO_INTEGER (MemRover); 636 return_ACPI_STATUS (AE_OK); 637 } 638 } 639 640 /* RSDP signature was not found */ 641 642 return_ACPI_STATUS (AE_NOT_FOUND); 643} 644 645#endif 646
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