- Check that the memory location that we are trying to read is valid
[reactos.git] / reactos / drivers / bus / acpi / acpica / tables / tbutils.c
1 /******************************************************************************
2 *
3 * Module Name: tbutils - table utilities
4 *
5 *****************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************/
115
116 #define __TBUTILS_C__
117
118 #include "acpi.h"
119 #include "accommon.h"
120 #include "actables.h"
121
122 #define _COMPONENT ACPI_TABLES
123 ACPI_MODULE_NAME ("tbutils")
124
125 /* Local prototypes */
126
127 static void
128 AcpiTbFixString (
129 char *String,
130 ACPI_SIZE Length);
131
132 static void
133 AcpiTbCleanupTableHeader (
134 ACPI_TABLE_HEADER *OutHeader,
135 ACPI_TABLE_HEADER *Header);
136
137 static ACPI_PHYSICAL_ADDRESS
138 AcpiTbGetRootTableEntry (
139 UINT8 *TableEntry,
140 UINT32 TableEntrySize);
141
142
143 /*******************************************************************************
144 *
145 * FUNCTION: AcpiTbInitializeFacs
146 *
147 * PARAMETERS: None
148 *
149 * RETURN: Status
150 *
151 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
152 * for accessing the Global Lock and Firmware Waking Vector
153 *
154 ******************************************************************************/
155
156 ACPI_STATUS
157 AcpiTbInitializeFacs (
158 void)
159 {
160 ACPI_STATUS Status;
161
162
163 Status = AcpiGetTableByIndex (ACPI_TABLE_INDEX_FACS,
164 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &AcpiGbl_FACS));
165 return (Status);
166 }
167
168
169 /*******************************************************************************
170 *
171 * FUNCTION: AcpiTbTablesLoaded
172 *
173 * PARAMETERS: None
174 *
175 * RETURN: TRUE if required ACPI tables are loaded
176 *
177 * DESCRIPTION: Determine if the minimum required ACPI tables are present
178 * (FADT, FACS, DSDT)
179 *
180 ******************************************************************************/
181
182 BOOLEAN
183 AcpiTbTablesLoaded (
184 void)
185 {
186
187 if (AcpiGbl_RootTableList.Count >= 3)
188 {
189 return (TRUE);
190 }
191
192 return (FALSE);
193 }
194
195
196 /*******************************************************************************
197 *
198 * FUNCTION: AcpiTbFixString
199 *
200 * PARAMETERS: String - String to be repaired
201 * Length - Maximum length
202 *
203 * RETURN: None
204 *
205 * DESCRIPTION: Replace every non-printable or non-ascii byte in the string
206 * with a question mark '?'.
207 *
208 ******************************************************************************/
209
210 static void
211 AcpiTbFixString (
212 char *String,
213 ACPI_SIZE Length)
214 {
215
216 while (Length && *String)
217 {
218 if (!ACPI_IS_PRINT (*String))
219 {
220 *String = '?';
221 }
222 String++;
223 Length--;
224 }
225 }
226
227
228 /*******************************************************************************
229 *
230 * FUNCTION: AcpiTbCleanupTableHeader
231 *
232 * PARAMETERS: OutHeader - Where the cleaned header is returned
233 * Header - Input ACPI table header
234 *
235 * RETURN: Returns the cleaned header in OutHeader
236 *
237 * DESCRIPTION: Copy the table header and ensure that all "string" fields in
238 * the header consist of printable characters.
239 *
240 ******************************************************************************/
241
242 static void
243 AcpiTbCleanupTableHeader (
244 ACPI_TABLE_HEADER *OutHeader,
245 ACPI_TABLE_HEADER *Header)
246 {
247
248 ACPI_MEMCPY (OutHeader, Header, sizeof (ACPI_TABLE_HEADER));
249
250 AcpiTbFixString (OutHeader->Signature, ACPI_NAME_SIZE);
251 AcpiTbFixString (OutHeader->OemId, ACPI_OEM_ID_SIZE);
252 AcpiTbFixString (OutHeader->OemTableId, ACPI_OEM_TABLE_ID_SIZE);
253 AcpiTbFixString (OutHeader->AslCompilerId, ACPI_NAME_SIZE);
254 }
255
256
257 /*******************************************************************************
258 *
259 * FUNCTION: AcpiTbPrintTableHeader
260 *
261 * PARAMETERS: Address - Table physical address
262 * Header - Table header
263 *
264 * RETURN: None
265 *
266 * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
267 *
268 ******************************************************************************/
269
270 void
271 AcpiTbPrintTableHeader (
272 ACPI_PHYSICAL_ADDRESS Address,
273 ACPI_TABLE_HEADER *Header)
274 {
275 ACPI_TABLE_HEADER LocalHeader;
276
277
278 /*
279 * The reason that the Address is cast to a void pointer is so that we
280 * can use %p which will work properly on both 32-bit and 64-bit hosts.
281 */
282 if (ACPI_COMPARE_NAME (Header->Signature, ACPI_SIG_FACS))
283 {
284 /* FACS only has signature and length fields */
285
286 ACPI_INFO ((AE_INFO, "%4.4s %p %05X",
287 Header->Signature, ACPI_CAST_PTR (void, Address),
288 Header->Length));
289 }
290 else if (ACPI_COMPARE_NAME (Header->Signature, ACPI_SIG_RSDP))
291 {
292 /* RSDP has no common fields */
293
294 ACPI_MEMCPY (LocalHeader.OemId,
295 ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->OemId, ACPI_OEM_ID_SIZE);
296 AcpiTbFixString (LocalHeader.OemId, ACPI_OEM_ID_SIZE);
297
298 ACPI_INFO ((AE_INFO, "RSDP %p %05X (v%.2d %6.6s)",
299 ACPI_CAST_PTR (void, Address),
300 (ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Revision > 0) ?
301 ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Length : 20,
302 ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Revision,
303 LocalHeader.OemId));
304 }
305 else
306 {
307 /* Standard ACPI table with full common header */
308
309 AcpiTbCleanupTableHeader (&LocalHeader, Header);
310
311 ACPI_INFO ((AE_INFO,
312 "%4.4s %p %05X (v%.2d %6.6s %8.8s %08X %4.4s %08X)",
313 LocalHeader.Signature, ACPI_CAST_PTR (void, Address),
314 LocalHeader.Length, LocalHeader.Revision, LocalHeader.OemId,
315 LocalHeader.OemTableId, LocalHeader.OemRevision,
316 LocalHeader.AslCompilerId, LocalHeader.AslCompilerRevision));
317 }
318 }
319
320
321 /*******************************************************************************
322 *
323 * FUNCTION: AcpiTbValidateChecksum
324 *
325 * PARAMETERS: Table - ACPI table to verify
326 * Length - Length of entire table
327 *
328 * RETURN: Status
329 *
330 * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
331 * exception on bad checksum.
332 *
333 ******************************************************************************/
334
335 ACPI_STATUS
336 AcpiTbVerifyChecksum (
337 ACPI_TABLE_HEADER *Table,
338 UINT32 Length)
339 {
340 UINT8 Checksum;
341
342
343 /* Compute the checksum on the table */
344
345 Checksum = AcpiTbChecksum (ACPI_CAST_PTR (UINT8, Table), Length);
346
347 /* Checksum ok? (should be zero) */
348
349 if (Checksum)
350 {
351 ACPI_WARNING ((AE_INFO,
352 "Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X",
353 Table->Signature, Table->Checksum,
354 (UINT8) (Table->Checksum - Checksum)));
355
356 #if (ACPI_CHECKSUM_ABORT)
357 return (AE_BAD_CHECKSUM);
358 #endif
359 }
360
361 return (AE_OK);
362 }
363
364
365 /*******************************************************************************
366 *
367 * FUNCTION: AcpiTbChecksum
368 *
369 * PARAMETERS: Buffer - Pointer to memory region to be checked
370 * Length - Length of this memory region
371 *
372 * RETURN: Checksum (UINT8)
373 *
374 * DESCRIPTION: Calculates circular checksum of memory region.
375 *
376 ******************************************************************************/
377
378 UINT8
379 AcpiTbChecksum (
380 UINT8 *Buffer,
381 UINT32 Length)
382 {
383 UINT8 Sum = 0;
384 UINT8 *End = Buffer + Length;
385
386
387 while (Buffer < End)
388 {
389 Sum = (UINT8) (Sum + *(Buffer++));
390 }
391
392 return Sum;
393 }
394
395
396 /*******************************************************************************
397 *
398 * FUNCTION: AcpiTbInstallTable
399 *
400 * PARAMETERS: Address - Physical address of DSDT or FACS
401 * Signature - Table signature, NULL if no need to
402 * match
403 * TableIndex - Index into root table array
404 *
405 * RETURN: None
406 *
407 * DESCRIPTION: Install an ACPI table into the global data structure. The
408 * table override mechanism is implemented here to allow the host
409 * OS to replace any table before it is installed in the root
410 * table array.
411 *
412 ******************************************************************************/
413
414 void
415 AcpiTbInstallTable (
416 ACPI_PHYSICAL_ADDRESS Address,
417 char *Signature,
418 UINT32 TableIndex)
419 {
420 UINT8 Flags;
421 ACPI_STATUS Status;
422 ACPI_TABLE_HEADER *TableToInstall;
423 ACPI_TABLE_HEADER *MappedTable;
424 ACPI_TABLE_HEADER *OverrideTable = NULL;
425
426
427 if (!Address)
428 {
429 ACPI_ERROR ((AE_INFO, "Null physical address for ACPI table [%s]",
430 Signature));
431 return;
432 }
433
434 /* Map just the table header */
435
436 MappedTable = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
437 if (!MappedTable)
438 {
439 return;
440 }
441
442 /* If a particular signature is expected (DSDT/FACS), it must match */
443
444 if (Signature &&
445 !ACPI_COMPARE_NAME (MappedTable->Signature, Signature))
446 {
447 ACPI_ERROR ((AE_INFO,
448 "Invalid signature 0x%X for ACPI table, expected [%s]",
449 *ACPI_CAST_PTR (UINT32, MappedTable->Signature), Signature));
450 goto UnmapAndExit;
451 }
452
453 /*
454 * ACPI Table Override:
455 *
456 * Before we install the table, let the host OS override it with a new
457 * one if desired. Any table within the RSDT/XSDT can be replaced,
458 * including the DSDT which is pointed to by the FADT.
459 */
460 Status = AcpiOsTableOverride (MappedTable, &OverrideTable);
461 if (ACPI_SUCCESS (Status) && OverrideTable)
462 {
463 ACPI_INFO ((AE_INFO,
464 "%4.4s @ 0x%p Table override, replaced with:",
465 MappedTable->Signature, ACPI_CAST_PTR (void, Address)));
466
467 AcpiGbl_RootTableList.Tables[TableIndex].Pointer = OverrideTable;
468 Address = ACPI_PTR_TO_PHYSADDR (OverrideTable);
469
470 TableToInstall = OverrideTable;
471 Flags = ACPI_TABLE_ORIGIN_OVERRIDE;
472 }
473 else
474 {
475 TableToInstall = MappedTable;
476 Flags = ACPI_TABLE_ORIGIN_MAPPED;
477 }
478
479 /* Initialize the table entry */
480
481 AcpiGbl_RootTableList.Tables[TableIndex].Address = Address;
482 AcpiGbl_RootTableList.Tables[TableIndex].Length = TableToInstall->Length;
483 AcpiGbl_RootTableList.Tables[TableIndex].Flags = Flags;
484
485 ACPI_MOVE_32_TO_32 (
486 &(AcpiGbl_RootTableList.Tables[TableIndex].Signature),
487 TableToInstall->Signature);
488
489 AcpiTbPrintTableHeader (Address, TableToInstall);
490
491 if (TableIndex == ACPI_TABLE_INDEX_DSDT)
492 {
493 /* Global integer width is based upon revision of the DSDT */
494
495 AcpiUtSetIntegerWidth (TableToInstall->Revision);
496 }
497
498 UnmapAndExit:
499 AcpiOsUnmapMemory (MappedTable, sizeof (ACPI_TABLE_HEADER));
500 }
501
502
503 /*******************************************************************************
504 *
505 * FUNCTION: AcpiTbGetRootTableEntry
506 *
507 * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry
508 * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT)
509 *
510 * RETURN: Physical address extracted from the root table
511 *
512 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
513 * both 32-bit and 64-bit platforms
514 *
515 * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on
516 * 64-bit platforms.
517 *
518 ******************************************************************************/
519
520 static ACPI_PHYSICAL_ADDRESS
521 AcpiTbGetRootTableEntry (
522 UINT8 *TableEntry,
523 UINT32 TableEntrySize)
524 {
525 UINT64 Address64;
526
527
528 /*
529 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
530 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
531 */
532 if (TableEntrySize == sizeof (UINT32))
533 {
534 /*
535 * 32-bit platform, RSDT: Return 32-bit table entry
536 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
537 */
538 return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR (UINT32, TableEntry)));
539 }
540 else
541 {
542 /*
543 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
544 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
545 * return 64-bit
546 */
547 ACPI_MOVE_64_TO_64 (&Address64, TableEntry);
548
549 #if ACPI_MACHINE_WIDTH == 32
550 if (Address64 > ACPI_UINT32_MAX)
551 {
552 /* Will truncate 64-bit address to 32 bits, issue warning */
553
554 ACPI_WARNING ((AE_INFO,
555 "64-bit Physical Address in XSDT is too large (%8.8X%8.8X),"
556 " truncating",
557 ACPI_FORMAT_UINT64 (Address64)));
558 }
559 #endif
560 return ((ACPI_PHYSICAL_ADDRESS) (Address64));
561 }
562 }
563
564
565 /*******************************************************************************
566 *
567 * FUNCTION: AcpiTbParseRootTable
568 *
569 * PARAMETERS: Rsdp - Pointer to the RSDP
570 *
571 * RETURN: Status
572 *
573 * DESCRIPTION: This function is called to parse the Root System Description
574 * Table (RSDT or XSDT)
575 *
576 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
577 * be mapped and cannot be copied because it contains the actual
578 * memory location of the ACPI Global Lock.
579 *
580 ******************************************************************************/
581
582 ACPI_STATUS
583 AcpiTbParseRootTable (
584 ACPI_PHYSICAL_ADDRESS RsdpAddress)
585 {
586 ACPI_TABLE_RSDP *Rsdp;
587 UINT32 TableEntrySize;
588 UINT32 i;
589 UINT32 TableCount;
590 ACPI_TABLE_HEADER *Table;
591 ACPI_PHYSICAL_ADDRESS Address;
592 UINT32 Length;
593 UINT8 *TableEntry;
594 ACPI_STATUS Status;
595
596
597 ACPI_FUNCTION_TRACE (TbParseRootTable);
598
599
600 /*
601 * Map the entire RSDP and extract the address of the RSDT or XSDT
602 */
603 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP));
604 if (!Rsdp)
605 {
606 return_ACPI_STATUS (AE_NO_MEMORY);
607 }
608
609 AcpiTbPrintTableHeader (RsdpAddress,
610 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp));
611
612 /* Differentiate between RSDT and XSDT root tables */
613
614 if (Rsdp->Revision > 1 && Rsdp->XsdtPhysicalAddress)
615 {
616 /*
617 * Root table is an XSDT (64-bit physical addresses). We must use the
618 * XSDT if the revision is > 1 and the XSDT pointer is present, as per
619 * the ACPI specification.
620 */
621 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress;
622 TableEntrySize = sizeof (UINT64);
623 }
624 else
625 {
626 /* Root table is an RSDT (32-bit physical addresses) */
627
628 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
629 TableEntrySize = sizeof (UINT32);
630 }
631
632 /*
633 * It is not possible to map more than one entry in some environments,
634 * so unmap the RSDP here before mapping other tables
635 */
636 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP));
637
638
639 /* Map the RSDT/XSDT table header to get the full table length */
640
641 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
642 if (!Table)
643 {
644 return_ACPI_STATUS (AE_NO_MEMORY);
645 }
646
647 AcpiTbPrintTableHeader (Address, Table);
648
649 /* Get the length of the full table, verify length and map entire table */
650
651 Length = Table->Length;
652 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
653
654 if (Length < sizeof (ACPI_TABLE_HEADER))
655 {
656 ACPI_ERROR ((AE_INFO, "Invalid length 0x%X in RSDT/XSDT", Length));
657 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
658 }
659
660 Table = AcpiOsMapMemory (Address, Length);
661 if (!Table)
662 {
663 return_ACPI_STATUS (AE_NO_MEMORY);
664 }
665
666 /* Validate the root table checksum */
667
668 Status = AcpiTbVerifyChecksum (Table, Length);
669 if (ACPI_FAILURE (Status))
670 {
671 AcpiOsUnmapMemory (Table, Length);
672 return_ACPI_STATUS (Status);
673 }
674
675 /* Calculate the number of tables described in the root table */
676
677 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
678 TableEntrySize);
679
680 /*
681 * First two entries in the table array are reserved for the DSDT
682 * and FACS, which are not actually present in the RSDT/XSDT - they
683 * come from the FADT
684 */
685 TableEntry = ACPI_CAST_PTR (UINT8, Table) + sizeof (ACPI_TABLE_HEADER);
686 AcpiGbl_RootTableList.Count = 2;
687
688 /*
689 * Initialize the root table array from the RSDT/XSDT
690 */
691 for (i = 0; i < TableCount; i++)
692 {
693 if (AcpiGbl_RootTableList.Count >= AcpiGbl_RootTableList.Size)
694 {
695 /* There is no more room in the root table array, attempt resize */
696
697 Status = AcpiTbResizeRootTableList ();
698 if (ACPI_FAILURE (Status))
699 {
700 ACPI_WARNING ((AE_INFO, "Truncating %u table entries!",
701 (unsigned) (TableCount -
702 (AcpiGbl_RootTableList.Count - 2))));
703 break;
704 }
705 }
706
707 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
708
709 AcpiGbl_RootTableList.Tables[AcpiGbl_RootTableList.Count].Address =
710 AcpiTbGetRootTableEntry (TableEntry, TableEntrySize);
711
712 TableEntry += TableEntrySize;
713 AcpiGbl_RootTableList.Count++;
714 }
715
716 /*
717 * It is not possible to map more than one entry in some environments,
718 * so unmap the root table here before mapping other tables
719 */
720 AcpiOsUnmapMemory (Table, Length);
721
722 /*
723 * Complete the initialization of the root table array by examining
724 * the header of each table
725 */
726 for (i = 2; i < AcpiGbl_RootTableList.Count; i++)
727 {
728 AcpiTbInstallTable (AcpiGbl_RootTableList.Tables[i].Address,
729 NULL, i);
730
731 /* Special case for FADT - get the DSDT and FACS */
732
733 if (ACPI_COMPARE_NAME (
734 &AcpiGbl_RootTableList.Tables[i].Signature, ACPI_SIG_FADT))
735 {
736 AcpiTbParseFadt (i);
737 }
738 }
739
740 return_ACPI_STATUS (AE_OK);
741 }