1 /******************************************************************************
2 *
3 * Module Name: tbfadt - FADT table utilities
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2014, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include "acpi.h"
45 #include "accommon.h"
46 #include "actables.h"
47
48 #define _COMPONENT ACPI_TABLES
49 ACPI_MODULE_NAME ("tbfadt")
50
51 /* Local prototypes */
52
53 static void
54 AcpiTbInitGenericAddress (
55 ACPI_GENERIC_ADDRESS *GenericAddress,
56 UINT8 SpaceId,
57 UINT8 ByteWidth,
58 UINT64 Address,
59 char *RegisterName,
60 UINT8 Flags);
61
62 static void
63 AcpiTbConvertFadt (
64 void);
65
66 static void
67 AcpiTbSetupFadtRegisters (
68 void);
69
70 static UINT64
71 AcpiTbSelectAddress (
72 char *RegisterName,
73 UINT32 Address32,
74 UINT64 Address64);
75
76
77 /* Table for conversion of FADT to common internal format and FADT validation */
78
79 typedef struct acpi_fadt_info
80 {
81 char *Name;
82 UINT16 Address64;
83 UINT16 Address32;
84 UINT16 Length;
85 UINT8 DefaultLength;
86 UINT8 Flags;
87
88 } ACPI_FADT_INFO;
89
90 #define ACPI_FADT_OPTIONAL 0
91 #define ACPI_FADT_REQUIRED 1
92 #define ACPI_FADT_SEPARATE_LENGTH 2
93 #define ACPI_FADT_GPE_REGISTER 4
94
95 static ACPI_FADT_INFO FadtInfoTable[] =
96 {
97 {"Pm1aEventBlock",
98 ACPI_FADT_OFFSET (XPm1aEventBlock),
99 ACPI_FADT_OFFSET (Pm1aEventBlock),
100 ACPI_FADT_OFFSET (Pm1EventLength),
101 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
102 ACPI_FADT_REQUIRED},
103
104 {"Pm1bEventBlock",
105 ACPI_FADT_OFFSET (XPm1bEventBlock),
106 ACPI_FADT_OFFSET (Pm1bEventBlock),
107 ACPI_FADT_OFFSET (Pm1EventLength),
108 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
109 ACPI_FADT_OPTIONAL},
110
111 {"Pm1aControlBlock",
112 ACPI_FADT_OFFSET (XPm1aControlBlock),
113 ACPI_FADT_OFFSET (Pm1aControlBlock),
114 ACPI_FADT_OFFSET (Pm1ControlLength),
115 ACPI_PM1_REGISTER_WIDTH,
116 ACPI_FADT_REQUIRED},
117
118 {"Pm1bControlBlock",
119 ACPI_FADT_OFFSET (XPm1bControlBlock),
120 ACPI_FADT_OFFSET (Pm1bControlBlock),
121 ACPI_FADT_OFFSET (Pm1ControlLength),
122 ACPI_PM1_REGISTER_WIDTH,
123 ACPI_FADT_OPTIONAL},
124
125 {"Pm2ControlBlock",
126 ACPI_FADT_OFFSET (XPm2ControlBlock),
127 ACPI_FADT_OFFSET (Pm2ControlBlock),
128 ACPI_FADT_OFFSET (Pm2ControlLength),
129 ACPI_PM2_REGISTER_WIDTH,
130 ACPI_FADT_SEPARATE_LENGTH},
131
132 {"PmTimerBlock",
133 ACPI_FADT_OFFSET (XPmTimerBlock),
134 ACPI_FADT_OFFSET (PmTimerBlock),
135 ACPI_FADT_OFFSET (PmTimerLength),
136 ACPI_PM_TIMER_WIDTH,
137 ACPI_FADT_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */
138
139 {"Gpe0Block",
140 ACPI_FADT_OFFSET (XGpe0Block),
141 ACPI_FADT_OFFSET (Gpe0Block),
142 ACPI_FADT_OFFSET (Gpe0BlockLength),
143 0,
144 ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER},
145
146 {"Gpe1Block",
147 ACPI_FADT_OFFSET (XGpe1Block),
148 ACPI_FADT_OFFSET (Gpe1Block),
149 ACPI_FADT_OFFSET (Gpe1BlockLength),
150 0,
151 ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER}
152 };
153
154 #define ACPI_FADT_INFO_ENTRIES \
155 (sizeof (FadtInfoTable) / sizeof (ACPI_FADT_INFO))
156
157
158 /* Table used to split Event Blocks into separate status/enable registers */
159
160 typedef struct acpi_fadt_pm_info
161 {
162 ACPI_GENERIC_ADDRESS *Target;
163 UINT16 Source;
164 UINT8 RegisterNum;
165
166 } ACPI_FADT_PM_INFO;
167
168 static ACPI_FADT_PM_INFO FadtPmInfoTable[] =
169 {
170 {&AcpiGbl_XPm1aStatus,
171 ACPI_FADT_OFFSET (XPm1aEventBlock),
172 0},
173
174 {&AcpiGbl_XPm1aEnable,
175 ACPI_FADT_OFFSET (XPm1aEventBlock),
176 1},
177
178 {&AcpiGbl_XPm1bStatus,
179 ACPI_FADT_OFFSET (XPm1bEventBlock),
180 0},
181
182 {&AcpiGbl_XPm1bEnable,
183 ACPI_FADT_OFFSET (XPm1bEventBlock),
184 1}
185 };
186
187 #define ACPI_FADT_PM_INFO_ENTRIES \
188 (sizeof (FadtPmInfoTable) / sizeof (ACPI_FADT_PM_INFO))
189
190
191 /*******************************************************************************
192 *
193 * FUNCTION: AcpiTbInitGenericAddress
194 *
195 * PARAMETERS: GenericAddress - GAS struct to be initialized
196 * SpaceId - ACPI Space ID for this register
197 * ByteWidth - Width of this register
198 * Address - Address of the register
199 * RegisterName - ASCII name of the ACPI register
200 *
201 * RETURN: None
202 *
203 * DESCRIPTION: Initialize a Generic Address Structure (GAS)
204 * See the ACPI specification for a full description and
205 * definition of this structure.
206 *
207 ******************************************************************************/
208
209 static void
AcpiTbInitGenericAddress(ACPI_GENERIC_ADDRESS * GenericAddress,UINT8 SpaceId,UINT8 ByteWidth,UINT64 Address,char * RegisterName,UINT8 Flags)210 AcpiTbInitGenericAddress (
211 ACPI_GENERIC_ADDRESS *GenericAddress,
212 UINT8 SpaceId,
213 UINT8 ByteWidth,
214 UINT64 Address,
215 char *RegisterName,
216 UINT8 Flags)
217 {
218 UINT8 BitWidth;
219
220
221 /*
222 * Bit width field in the GAS is only one byte long, 255 max.
223 * Check for BitWidth overflow in GAS.
224 */
225 BitWidth = (UINT8) (ByteWidth * 8);
226 if (ByteWidth > 31) /* (31*8)=248, (32*8)=256 */
227 {
228 /*
229 * No error for GPE blocks, because we do not use the BitWidth
230 * for GPEs, the legacy length (ByteWidth) is used instead to
231 * allow for a large number of GPEs.
232 */
233 if (!(Flags & ACPI_FADT_GPE_REGISTER))
234 {
235 ACPI_ERROR ((AE_INFO,
236 "%s - 32-bit FADT register is too long (%u bytes, %u bits) "
237 "to convert to GAS struct - 255 bits max, truncating",
238 RegisterName, ByteWidth, (ByteWidth * 8)));
239 }
240
241 BitWidth = 255;
242 }
243
244 /*
245 * The 64-bit Address field is non-aligned in the byte packed
246 * GAS struct.
247 */
248 ACPI_MOVE_64_TO_64 (&GenericAddress->Address, &Address);
249
250 /* All other fields are byte-wide */
251
252 GenericAddress->SpaceId = SpaceId;
253 GenericAddress->BitWidth = BitWidth;
254 GenericAddress->BitOffset = 0;
255 GenericAddress->AccessWidth = 0; /* Access width ANY */
256 }
257
258
259 /*******************************************************************************
260 *
261 * FUNCTION: AcpiTbSelectAddress
262 *
263 * PARAMETERS: RegisterName - ASCII name of the ACPI register
264 * Address32 - 32-bit address of the register
265 * Address64 - 64-bit address of the register
266 *
267 * RETURN: The resolved 64-bit address
268 *
269 * DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within
270 * the FADT. Used for the FACS and DSDT addresses.
271 *
272 * NOTES:
273 *
274 * Check for FACS and DSDT address mismatches. An address mismatch between
275 * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
276 * DSDT/X_DSDT) could be a corrupted address field or it might indicate
277 * the presence of two FACS or two DSDT tables.
278 *
279 * November 2013:
280 * By default, as per the ACPICA specification, a valid 64-bit address is
281 * used regardless of the value of the 32-bit address. However, this
282 * behavior can be overridden via the AcpiGbl_Use32BitFadtAddresses flag.
283 *
284 ******************************************************************************/
285
286 static UINT64
AcpiTbSelectAddress(char * RegisterName,UINT32 Address32,UINT64 Address64)287 AcpiTbSelectAddress (
288 char *RegisterName,
289 UINT32 Address32,
290 UINT64 Address64)
291 {
292
293 if (!Address64)
294 {
295 /* 64-bit address is zero, use 32-bit address */
296
297 return ((UINT64) Address32);
298 }
299
300 if (Address32 &&
301 (Address64 != (UINT64) Address32))
302 {
303 /* Address mismatch between 32-bit and 64-bit versions */
304
305 ACPI_BIOS_WARNING ((AE_INFO,
306 "32/64X %s address mismatch in FADT: "
307 "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
308 RegisterName, Address32, ACPI_FORMAT_UINT64 (Address64),
309 AcpiGbl_Use32BitFadtAddresses ? 32 : 64));
310
311 /* 32-bit address override */
312
313 if (AcpiGbl_Use32BitFadtAddresses)
314 {
315 return ((UINT64) Address32);
316 }
317 }
318
319 /* Default is to use the 64-bit address */
320
321 return (Address64);
322 }
323
324
325 /*******************************************************************************
326 *
327 * FUNCTION: AcpiTbParseFadt
328 *
329 * PARAMETERS: TableIndex - Index for the FADT
330 *
331 * RETURN: None
332 *
333 * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
334 * (FADT contains the addresses of the DSDT and FACS)
335 *
336 ******************************************************************************/
337
338 void
AcpiTbParseFadt(UINT32 TableIndex)339 AcpiTbParseFadt (
340 UINT32 TableIndex)
341 {
342 UINT32 Length;
343 ACPI_TABLE_HEADER *Table;
344
345
346 /*
347 * The FADT has multiple versions with different lengths,
348 * and it contains pointers to both the DSDT and FACS tables.
349 *
350 * Get a local copy of the FADT and convert it to a common format
351 * Map entire FADT, assumed to be smaller than one page.
352 */
353 Length = AcpiGbl_RootTableList.Tables[TableIndex].Length;
354
355 Table = AcpiOsMapMemory (
356 AcpiGbl_RootTableList.Tables[TableIndex].Address, Length);
357 if (!Table)
358 {
359 return;
360 }
361
362 /*
363 * Validate the FADT checksum before we copy the table. Ignore
364 * checksum error as we want to try to get the DSDT and FACS.
365 */
366 (void) AcpiTbVerifyChecksum (Table, Length);
367
368 /* Create a local copy of the FADT in common ACPI 2.0+ format */
369
370 AcpiTbCreateLocalFadt (Table, Length);
371
372 /* All done with the real FADT, unmap it */
373
374 AcpiOsUnmapMemory (Table, Length);
375
376 /* Obtain the DSDT and FACS tables via their addresses within the FADT */
377
378 AcpiTbInstallFixedTable ((ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.XDsdt,
379 ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
380
381 /* If Hardware Reduced flag is set, there is no FACS */
382
383 if (!AcpiGbl_ReducedHardware)
384 {
385 AcpiTbInstallFixedTable ((ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.XFacs,
386 ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);
387 }
388 }
389
390
391 /*******************************************************************************
392 *
393 * FUNCTION: AcpiTbCreateLocalFadt
394 *
395 * PARAMETERS: Table - Pointer to BIOS FADT
396 * Length - Length of the table
397 *
398 * RETURN: None
399 *
400 * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
401 * Performs validation on some important FADT fields.
402 *
403 * NOTE: We create a local copy of the FADT regardless of the version.
404 *
405 ******************************************************************************/
406
407 void
AcpiTbCreateLocalFadt(ACPI_TABLE_HEADER * Table,UINT32 Length)408 AcpiTbCreateLocalFadt (
409 ACPI_TABLE_HEADER *Table,
410 UINT32 Length)
411 {
412
413 /*
414 * Check if the FADT is larger than the largest table that we expect
415 * (the ACPI 5.0 version). If so, truncate the table, and issue
416 * a warning.
417 */
418 if (Length > sizeof (ACPI_TABLE_FADT))
419 {
420 ACPI_BIOS_WARNING ((AE_INFO,
421 "FADT (revision %u) is longer than ACPI 5.0 version, "
422 "truncating length %u to %u",
423 Table->Revision, Length, (UINT32) sizeof (ACPI_TABLE_FADT)));
424 }
425
426 /* Clear the entire local FADT */
427
428 ACPI_MEMSET (&AcpiGbl_FADT, 0, sizeof (ACPI_TABLE_FADT));
429
430 /* Copy the original FADT, up to sizeof (ACPI_TABLE_FADT) */
431
432 ACPI_MEMCPY (&AcpiGbl_FADT, Table,
433 ACPI_MIN (Length, sizeof (ACPI_TABLE_FADT)));
434
435 /* Take a copy of the Hardware Reduced flag */
436
437 AcpiGbl_ReducedHardware = FALSE;
438 if (AcpiGbl_FADT.Flags & ACPI_FADT_HW_REDUCED)
439 {
440 AcpiGbl_ReducedHardware = TRUE;
441 }
442
443 /* Convert the local copy of the FADT to the common internal format */
444
445 AcpiTbConvertFadt ();
446
447 /* Initialize the global ACPI register structures */
448
449 AcpiTbSetupFadtRegisters ();
450 }
451
452
453 /*******************************************************************************
454 *
455 * FUNCTION: AcpiTbConvertFadt
456 *
457 * PARAMETERS: None - AcpiGbl_FADT is used.
458 *
459 * RETURN: None
460 *
461 * DESCRIPTION: Converts all versions of the FADT to a common internal format.
462 * Expand 32-bit addresses to 64-bit as necessary. Also validate
463 * important fields within the FADT.
464 *
465 * NOTE: AcpiGbl_FADT must be of size (ACPI_TABLE_FADT), and must
466 * contain a copy of the actual BIOS-provided FADT.
467 *
468 * Notes on 64-bit register addresses:
469 *
470 * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
471 * fields of the FADT for all ACPI register addresses.
472 *
473 * The 64-bit X fields are optional extensions to the original 32-bit FADT
474 * V1.0 fields. Even if they are present in the FADT, they are optional and
475 * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
476 * 32-bit V1.0 fields to the 64-bit X fields if the the 64-bit X field is
477 * originally zero.
478 *
479 * For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address
480 * fields are expanded to the corresponding 64-bit X fields in the internal
481 * common FADT.
482 *
483 * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
484 * to the corresponding 64-bit X fields, if the 64-bit field is originally
485 * zero. Adhering to the ACPI specification, we completely ignore the 32-bit
486 * field if the 64-bit field is valid, regardless of whether the host OS is
487 * 32-bit or 64-bit.
488 *
489 * Possible additional checks:
490 * (AcpiGbl_FADT.Pm1EventLength >= 4)
491 * (AcpiGbl_FADT.Pm1ControlLength >= 2)
492 * (AcpiGbl_FADT.PmTimerLength >= 4)
493 * Gpe block lengths must be multiple of 2
494 *
495 ******************************************************************************/
496
497 static void
AcpiTbConvertFadt(void)498 AcpiTbConvertFadt (
499 void)
500 {
501 char *Name;
502 ACPI_GENERIC_ADDRESS *Address64;
503 UINT32 Address32;
504 UINT8 Length;
505 UINT8 Flags;
506 UINT32 i;
507
508
509 /*
510 * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
511 * should be zero are indeed zero. This will workaround BIOSs that
512 * inadvertently place values in these fields.
513 *
514 * The ACPI 1.0 reserved fields that will be zeroed are the bytes located
515 * at offset 45, 55, 95, and the word located at offset 109, 110.
516 *
517 * Note: The FADT revision value is unreliable. Only the length can be
518 * trusted.
519 */
520 if (AcpiGbl_FADT.Header.Length <= ACPI_FADT_V2_SIZE)
521 {
522 AcpiGbl_FADT.PreferredProfile = 0;
523 AcpiGbl_FADT.PstateControl = 0;
524 AcpiGbl_FADT.CstControl = 0;
525 AcpiGbl_FADT.BootFlags = 0;
526 }
527
528 /*
529 * Now we can update the local FADT length to the length of the
530 * current FADT version as defined by the ACPI specification.
531 * Thus, we will have a common FADT internally.
532 */
533 AcpiGbl_FADT.Header.Length = sizeof (ACPI_TABLE_FADT);
534
535 /*
536 * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
537 * Later ACPICA code will always use the X 64-bit field.
538 */
539 AcpiGbl_FADT.XFacs = AcpiTbSelectAddress ("FACS",
540 AcpiGbl_FADT.Facs, AcpiGbl_FADT.XFacs);
541
542 AcpiGbl_FADT.XDsdt = AcpiTbSelectAddress ("DSDT",
543 AcpiGbl_FADT.Dsdt, AcpiGbl_FADT.XDsdt);
544
545 /* If Hardware Reduced flag is set, we are all done */
546
547 if (AcpiGbl_ReducedHardware)
548 {
549 return;
550 }
551
552 /* Examine all of the 64-bit extended address fields (X fields) */
553
554 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++)
555 {
556 /*
557 * Get the 32-bit and 64-bit addresses, as well as the register
558 * length and register name.
559 */
560 Address32 = *ACPI_ADD_PTR (UINT32,
561 &AcpiGbl_FADT, FadtInfoTable[i].Address32);
562
563 Address64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS,
564 &AcpiGbl_FADT, FadtInfoTable[i].Address64);
565
566 Length = *ACPI_ADD_PTR (UINT8,
567 &AcpiGbl_FADT, FadtInfoTable[i].Length);
568
569 Name = FadtInfoTable[i].Name;
570 Flags = FadtInfoTable[i].Flags;
571
572 /*
573 * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
574 * generic address structures as necessary. Later code will always use
575 * the 64-bit address structures.
576 *
577 * November 2013:
578 * Now always use the 64-bit address if it is valid (non-zero), in
579 * accordance with the ACPI specification which states that a 64-bit
580 * address supersedes the 32-bit version. This behavior can be
581 * overridden by the AcpiGbl_Use32BitFadtAddresses flag.
582 *
583 * During 64-bit address construction and verification,
584 * these cases are handled:
585 *
586 * Address32 zero, Address64 [don't care] - Use Address64
587 *
588 * Address32 non-zero, Address64 zero - Copy/use Address32
589 * Address32 non-zero == Address64 non-zero - Use Address64
590 * Address32 non-zero != Address64 non-zero - Warning, use Address64
591 *
592 * Override: if AcpiGbl_Use32BitFadtAddresses is TRUE, and:
593 * Address32 non-zero != Address64 non-zero - Warning, copy/use Address32
594 *
595 * Note: SpaceId is always I/O for 32-bit legacy address fields
596 */
597 if (Address32)
598 {
599 if (!Address64->Address)
600 {
601 /* 64-bit address is zero, use 32-bit address */
602
603 AcpiTbInitGenericAddress (Address64,
604 ACPI_ADR_SPACE_SYSTEM_IO,
605 *ACPI_ADD_PTR (UINT8, &AcpiGbl_FADT,
606 FadtInfoTable[i].Length),
607 (UINT64) Address32, Name, Flags);
608 }
609 else if (Address64->Address != (UINT64) Address32)
610 {
611 /* Address mismatch */
612
613 ACPI_BIOS_WARNING ((AE_INFO,
614 "32/64X address mismatch in FADT/%s: "
615 "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
616 Name, Address32,
617 ACPI_FORMAT_UINT64 (Address64->Address),
618 AcpiGbl_Use32BitFadtAddresses ? 32 : 64));
619
620 if (AcpiGbl_Use32BitFadtAddresses)
621 {
622 /* 32-bit address override */
623
624 AcpiTbInitGenericAddress (Address64,
625 ACPI_ADR_SPACE_SYSTEM_IO,
626 *ACPI_ADD_PTR (UINT8, &AcpiGbl_FADT,
627 FadtInfoTable[i].Length),
628 (UINT64) Address32, Name, Flags);
629 }
630 }
631 }
632
633 /*
634 * For each extended field, check for length mismatch between the
635 * legacy length field and the corresponding 64-bit X length field.
636 * Note: If the legacy length field is > 0xFF bits, ignore this
637 * check. (GPE registers can be larger than the 64-bit GAS structure
638 * can accomodate, 0xFF bits).
639 */
640 if (Address64->Address &&
641 (ACPI_MUL_8 (Length) <= ACPI_UINT8_MAX) &&
642 (Address64->BitWidth != ACPI_MUL_8 (Length)))
643 {
644 ACPI_BIOS_WARNING ((AE_INFO,
645 "32/64X length mismatch in FADT/%s: %u/%u",
646 Name, ACPI_MUL_8 (Length), Address64->BitWidth));
647 }
648
649 if (FadtInfoTable[i].Flags & ACPI_FADT_REQUIRED)
650 {
651 /*
652 * Field is required (PM1aEvent, PM1aControl).
653 * Both the address and length must be non-zero.
654 */
655 if (!Address64->Address || !Length)
656 {
657 ACPI_BIOS_ERROR ((AE_INFO,
658 "Required FADT field %s has zero address and/or length: "
659 "0x%8.8X%8.8X/0x%X",
660 Name, ACPI_FORMAT_UINT64 (Address64->Address), Length));
661 }
662 }
663 else if (FadtInfoTable[i].Flags & ACPI_FADT_SEPARATE_LENGTH)
664 {
665 /*
666 * Field is optional (PM2Control, GPE0, GPE1) AND has its own
667 * length field. If present, both the address and length must
668 * be valid.
669 */
670 if ((Address64->Address && !Length) ||
671 (!Address64->Address && Length))
672 {
673 ACPI_BIOS_WARNING ((AE_INFO,
674 "Optional FADT field %s has zero address or length: "
675 "0x%8.8X%8.8X/0x%X",
676 Name, ACPI_FORMAT_UINT64 (Address64->Address), Length));
677 }
678 }
679 }
680 }
681
682
683 /*******************************************************************************
684 *
685 * FUNCTION: AcpiTbSetupFadtRegisters
686 *
687 * PARAMETERS: None, uses AcpiGbl_FADT.
688 *
689 * RETURN: None
690 *
691 * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
692 * force FADT register definitions to their default lengths.
693 *
694 ******************************************************************************/
695
696 static void
AcpiTbSetupFadtRegisters(void)697 AcpiTbSetupFadtRegisters (
698 void)
699 {
700 ACPI_GENERIC_ADDRESS *Target64;
701 ACPI_GENERIC_ADDRESS *Source64;
702 UINT8 Pm1RegisterByteWidth;
703 UINT32 i;
704
705
706 /*
707 * Optionally check all register lengths against the default values and
708 * update them if they are incorrect.
709 */
710 if (AcpiGbl_UseDefaultRegisterWidths)
711 {
712 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++)
713 {
714 Target64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS, &AcpiGbl_FADT,
715 FadtInfoTable[i].Address64);
716
717 /*
718 * If a valid register (Address != 0) and the (DefaultLength > 0)
719 * (Not a GPE register), then check the width against the default.
720 */
721 if ((Target64->Address) &&
722 (FadtInfoTable[i].DefaultLength > 0) &&
723 (FadtInfoTable[i].DefaultLength != Target64->BitWidth))
724 {
725 ACPI_BIOS_WARNING ((AE_INFO,
726 "Invalid length for FADT/%s: %u, using default %u",
727 FadtInfoTable[i].Name, Target64->BitWidth,
728 FadtInfoTable[i].DefaultLength));
729
730 /* Incorrect size, set width to the default */
731
732 Target64->BitWidth = FadtInfoTable[i].DefaultLength;
733 }
734 }
735 }
736
737 /*
738 * Get the length of the individual PM1 registers (enable and status).
739 * Each register is defined to be (event block length / 2). Extra divide
740 * by 8 converts bits to bytes.
741 */
742 Pm1RegisterByteWidth = (UINT8)
743 ACPI_DIV_16 (AcpiGbl_FADT.XPm1aEventBlock.BitWidth);
744
745 /*
746 * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
747 * registers. These addresses do not appear (directly) in the FADT, so it
748 * is useful to pre-calculate them from the PM1 Event Block definitions.
749 *
750 * The PM event blocks are split into two register blocks, first is the
751 * PM Status Register block, followed immediately by the PM Enable
752 * Register block. Each is of length (Pm1EventLength/2)
753 *
754 * Note: The PM1A event block is required by the ACPI specification.
755 * However, the PM1B event block is optional and is rarely, if ever,
756 * used.
757 */
758
759 for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++)
760 {
761 Source64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS, &AcpiGbl_FADT,
762 FadtPmInfoTable[i].Source);
763
764 if (Source64->Address)
765 {
766 AcpiTbInitGenericAddress (FadtPmInfoTable[i].Target,
767 Source64->SpaceId, Pm1RegisterByteWidth,
768 Source64->Address +
769 (FadtPmInfoTable[i].RegisterNum * Pm1RegisterByteWidth),
770 "PmRegisters", 0);
771 }
772 }
773 }
774