1 /******************************************************************************
3 * Module Name: tbfadt - FADT table utilities
5 *****************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
12 * All rights reserved.
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
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
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;
37 * The above copyright and patent license is granted only if the following
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.
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
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
72 * 3.4. Intel retains all right, title, and interest in and to the Original
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.
80 * 4. Disclaimer and Export Compliance
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
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
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.
114 *****************************************************************************
116 * Alternatively, you may choose to be licensed under the terms of the
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
150 *****************************************************************************/
153 #include "accommon.h"
154 #include "actables.h"
156 #define _COMPONENT ACPI_TABLES
157 ACPI_MODULE_NAME ("tbfadt")
159 /* Local prototypes */
162 AcpiTbInitGenericAddress (
163 ACPI_GENERIC_ADDRESS
*GenericAddress
,
167 const char *RegisterName
,
175 AcpiTbSetupFadtRegisters (
179 AcpiTbSelectAddress (
185 /* Table for conversion of FADT to common internal format and FADT validation */
187 typedef struct acpi_fadt_info
198 #define ACPI_FADT_OPTIONAL 0
199 #define ACPI_FADT_REQUIRED 1
200 #define ACPI_FADT_SEPARATE_LENGTH 2
201 #define ACPI_FADT_GPE_REGISTER 4
203 static ACPI_FADT_INFO FadtInfoTable
[] =
206 ACPI_FADT_OFFSET (XPm1aEventBlock
),
207 ACPI_FADT_OFFSET (Pm1aEventBlock
),
208 ACPI_FADT_OFFSET (Pm1EventLength
),
209 ACPI_PM1_REGISTER_WIDTH
* 2, /* Enable + Status register */
213 ACPI_FADT_OFFSET (XPm1bEventBlock
),
214 ACPI_FADT_OFFSET (Pm1bEventBlock
),
215 ACPI_FADT_OFFSET (Pm1EventLength
),
216 ACPI_PM1_REGISTER_WIDTH
* 2, /* Enable + Status register */
220 ACPI_FADT_OFFSET (XPm1aControlBlock
),
221 ACPI_FADT_OFFSET (Pm1aControlBlock
),
222 ACPI_FADT_OFFSET (Pm1ControlLength
),
223 ACPI_PM1_REGISTER_WIDTH
,
227 ACPI_FADT_OFFSET (XPm1bControlBlock
),
228 ACPI_FADT_OFFSET (Pm1bControlBlock
),
229 ACPI_FADT_OFFSET (Pm1ControlLength
),
230 ACPI_PM1_REGISTER_WIDTH
,
234 ACPI_FADT_OFFSET (XPm2ControlBlock
),
235 ACPI_FADT_OFFSET (Pm2ControlBlock
),
236 ACPI_FADT_OFFSET (Pm2ControlLength
),
237 ACPI_PM2_REGISTER_WIDTH
,
238 ACPI_FADT_SEPARATE_LENGTH
},
241 ACPI_FADT_OFFSET (XPmTimerBlock
),
242 ACPI_FADT_OFFSET (PmTimerBlock
),
243 ACPI_FADT_OFFSET (PmTimerLength
),
245 ACPI_FADT_SEPARATE_LENGTH
}, /* ACPI 5.0A: Timer is optional */
248 ACPI_FADT_OFFSET (XGpe0Block
),
249 ACPI_FADT_OFFSET (Gpe0Block
),
250 ACPI_FADT_OFFSET (Gpe0BlockLength
),
252 ACPI_FADT_SEPARATE_LENGTH
| ACPI_FADT_GPE_REGISTER
},
255 ACPI_FADT_OFFSET (XGpe1Block
),
256 ACPI_FADT_OFFSET (Gpe1Block
),
257 ACPI_FADT_OFFSET (Gpe1BlockLength
),
259 ACPI_FADT_SEPARATE_LENGTH
| ACPI_FADT_GPE_REGISTER
}
262 #define ACPI_FADT_INFO_ENTRIES \
263 (sizeof (FadtInfoTable) / sizeof (ACPI_FADT_INFO))
266 /* Table used to split Event Blocks into separate status/enable registers */
268 typedef struct acpi_fadt_pm_info
270 ACPI_GENERIC_ADDRESS
*Target
;
276 static ACPI_FADT_PM_INFO FadtPmInfoTable
[] =
278 {&AcpiGbl_XPm1aStatus
,
279 ACPI_FADT_OFFSET (XPm1aEventBlock
),
282 {&AcpiGbl_XPm1aEnable
,
283 ACPI_FADT_OFFSET (XPm1aEventBlock
),
286 {&AcpiGbl_XPm1bStatus
,
287 ACPI_FADT_OFFSET (XPm1bEventBlock
),
290 {&AcpiGbl_XPm1bEnable
,
291 ACPI_FADT_OFFSET (XPm1bEventBlock
),
295 #define ACPI_FADT_PM_INFO_ENTRIES \
296 (sizeof (FadtPmInfoTable) / sizeof (ACPI_FADT_PM_INFO))
299 /*******************************************************************************
301 * FUNCTION: AcpiTbInitGenericAddress
303 * PARAMETERS: GenericAddress - GAS struct to be initialized
304 * SpaceId - ACPI Space ID for this register
305 * ByteWidth - Width of this register
306 * Address - Address of the register
307 * RegisterName - ASCII name of the ACPI register
311 * DESCRIPTION: Initialize a Generic Address Structure (GAS)
312 * See the ACPI specification for a full description and
313 * definition of this structure.
315 ******************************************************************************/
318 AcpiTbInitGenericAddress (
319 ACPI_GENERIC_ADDRESS
*GenericAddress
,
323 const char *RegisterName
,
330 * Bit width field in the GAS is only one byte long, 255 max.
331 * Check for BitWidth overflow in GAS.
333 BitWidth
= (UINT8
) (ByteWidth
* 8);
334 if (ByteWidth
> 31) /* (31*8)=248, (32*8)=256 */
337 * No error for GPE blocks, because we do not use the BitWidth
338 * for GPEs, the legacy length (ByteWidth) is used instead to
339 * allow for a large number of GPEs.
341 if (!(Flags
& ACPI_FADT_GPE_REGISTER
))
343 ACPI_ERROR ((AE_INFO
,
344 "%s - 32-bit FADT register is too long (%u bytes, %u bits) "
345 "to convert to GAS struct - 255 bits max, truncating",
346 RegisterName
, ByteWidth
, (ByteWidth
* 8)));
353 * The 64-bit Address field is non-aligned in the byte packed
356 ACPI_MOVE_64_TO_64 (&GenericAddress
->Address
, &Address
);
358 /* All other fields are byte-wide */
360 GenericAddress
->SpaceId
= SpaceId
;
361 GenericAddress
->BitWidth
= BitWidth
;
362 GenericAddress
->BitOffset
= 0;
363 GenericAddress
->AccessWidth
= 0; /* Access width ANY */
367 /*******************************************************************************
369 * FUNCTION: AcpiTbSelectAddress
371 * PARAMETERS: RegisterName - ASCII name of the ACPI register
372 * Address32 - 32-bit address of the register
373 * Address64 - 64-bit address of the register
375 * RETURN: The resolved 64-bit address
377 * DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within
378 * the FADT. Used for the FACS and DSDT addresses.
382 * Check for FACS and DSDT address mismatches. An address mismatch between
383 * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
384 * DSDT/X_DSDT) could be a corrupted address field or it might indicate
385 * the presence of two FACS or two DSDT tables.
388 * By default, as per the ACPICA specification, a valid 64-bit address is
389 * used regardless of the value of the 32-bit address. However, this
390 * behavior can be overridden via the AcpiGbl_Use32BitFadtAddresses flag.
392 ******************************************************************************/
395 AcpiTbSelectAddress (
403 /* 64-bit address is zero, use 32-bit address */
405 return ((UINT64
) Address32
);
409 (Address64
!= (UINT64
) Address32
))
411 /* Address mismatch between 32-bit and 64-bit versions */
413 ACPI_BIOS_WARNING ((AE_INFO
,
414 "32/64X %s address mismatch in FADT: "
415 "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
416 RegisterName
, Address32
, ACPI_FORMAT_UINT64 (Address64
),
417 AcpiGbl_Use32BitFadtAddresses
? 32 : 64));
419 /* 32-bit address override */
421 if (AcpiGbl_Use32BitFadtAddresses
)
423 return ((UINT64
) Address32
);
427 /* Default is to use the 64-bit address */
433 /*******************************************************************************
435 * FUNCTION: AcpiTbParseFadt
441 * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
442 * (FADT contains the addresses of the DSDT and FACS)
444 ******************************************************************************/
451 ACPI_TABLE_HEADER
*Table
;
452 ACPI_TABLE_DESC
*FadtDesc
;
457 * The FADT has multiple versions with different lengths,
458 * and it contains pointers to both the DSDT and FACS tables.
460 * Get a local copy of the FADT and convert it to a common format
461 * Map entire FADT, assumed to be smaller than one page.
463 FadtDesc
= &AcpiGbl_RootTableList
.Tables
[AcpiGbl_FadtIndex
];
464 Status
= AcpiTbGetTable (FadtDesc
, &Table
);
465 if (ACPI_FAILURE (Status
))
469 Length
= FadtDesc
->Length
;
472 * Validate the FADT checksum before we copy the table. Ignore
473 * checksum error as we want to try to get the DSDT and FACS.
475 (void) AcpiTbVerifyChecksum (Table
, Length
);
477 /* Create a local copy of the FADT in common ACPI 2.0+ format */
479 AcpiTbCreateLocalFadt (Table
, Length
);
481 /* All done with the real FADT, unmap it */
483 AcpiTbPutTable (FadtDesc
);
485 /* Obtain the DSDT and FACS tables via their addresses within the FADT */
487 AcpiTbInstallStandardTable (
488 (ACPI_PHYSICAL_ADDRESS
) AcpiGbl_FADT
.XDsdt
,
489 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL
, FALSE
, TRUE
,
492 /* If Hardware Reduced flag is set, there is no FACS */
494 if (!AcpiGbl_ReducedHardware
)
496 if (AcpiGbl_FADT
.Facs
)
498 AcpiTbInstallStandardTable (
499 (ACPI_PHYSICAL_ADDRESS
) AcpiGbl_FADT
.Facs
,
500 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL
, FALSE
, TRUE
,
503 if (AcpiGbl_FADT
.XFacs
)
505 AcpiTbInstallStandardTable (
506 (ACPI_PHYSICAL_ADDRESS
) AcpiGbl_FADT
.XFacs
,
507 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL
, FALSE
, TRUE
,
508 &AcpiGbl_XFacsIndex
);
514 /*******************************************************************************
516 * FUNCTION: AcpiTbCreateLocalFadt
518 * PARAMETERS: Table - Pointer to BIOS FADT
519 * Length - Length of the table
523 * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
524 * Performs validation on some important FADT fields.
526 * NOTE: We create a local copy of the FADT regardless of the version.
528 ******************************************************************************/
531 AcpiTbCreateLocalFadt (
532 ACPI_TABLE_HEADER
*Table
,
537 * Check if the FADT is larger than the largest table that we expect
538 * (typically the current ACPI specification version). If so, truncate
539 * the table, and issue a warning.
541 if (Length
> sizeof (ACPI_TABLE_FADT
))
543 ACPI_BIOS_WARNING ((AE_INFO
,
544 "FADT (revision %u) is longer than %s length, "
545 "truncating length %u to %u",
546 Table
->Revision
, ACPI_FADT_CONFORMANCE
, Length
,
547 (UINT32
) sizeof (ACPI_TABLE_FADT
)));
550 /* Clear the entire local FADT */
552 memset (&AcpiGbl_FADT
, 0, sizeof (ACPI_TABLE_FADT
));
554 /* Copy the original FADT, up to sizeof (ACPI_TABLE_FADT) */
556 memcpy (&AcpiGbl_FADT
, Table
,
557 ACPI_MIN (Length
, sizeof (ACPI_TABLE_FADT
)));
559 /* Take a copy of the Hardware Reduced flag */
561 AcpiGbl_ReducedHardware
= FALSE
;
562 if (AcpiGbl_FADT
.Flags
& ACPI_FADT_HW_REDUCED
)
564 AcpiGbl_ReducedHardware
= TRUE
;
567 /* Convert the local copy of the FADT to the common internal format */
569 AcpiTbConvertFadt ();
571 /* Initialize the global ACPI register structures */
573 AcpiTbSetupFadtRegisters ();
577 /*******************************************************************************
579 * FUNCTION: AcpiTbConvertFadt
581 * PARAMETERS: None - AcpiGbl_FADT is used.
585 * DESCRIPTION: Converts all versions of the FADT to a common internal format.
586 * Expand 32-bit addresses to 64-bit as necessary. Also validate
587 * important fields within the FADT.
589 * NOTE: AcpiGbl_FADT must be of size (ACPI_TABLE_FADT), and must
590 * contain a copy of the actual BIOS-provided FADT.
592 * Notes on 64-bit register addresses:
594 * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
595 * fields of the FADT for all ACPI register addresses.
597 * The 64-bit X fields are optional extensions to the original 32-bit FADT
598 * V1.0 fields. Even if they are present in the FADT, they are optional and
599 * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
600 * 32-bit V1.0 fields to the 64-bit X fields if the 64-bit X field is originally
603 * For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address
604 * fields are expanded to the corresponding 64-bit X fields in the internal
607 * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
608 * to the corresponding 64-bit X fields, if the 64-bit field is originally
609 * zero. Adhering to the ACPI specification, we completely ignore the 32-bit
610 * field if the 64-bit field is valid, regardless of whether the host OS is
613 * Possible additional checks:
614 * (AcpiGbl_FADT.Pm1EventLength >= 4)
615 * (AcpiGbl_FADT.Pm1ControlLength >= 2)
616 * (AcpiGbl_FADT.PmTimerLength >= 4)
617 * Gpe block lengths must be multiple of 2
619 ******************************************************************************/
626 ACPI_GENERIC_ADDRESS
*Address64
;
634 * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
635 * should be zero are indeed zero. This will workaround BIOSs that
636 * inadvertently place values in these fields.
638 * The ACPI 1.0 reserved fields that will be zeroed are the bytes located
639 * at offset 45, 55, 95, and the word located at offset 109, 110.
641 * Note: The FADT revision value is unreliable. Only the length can be
644 if (AcpiGbl_FADT
.Header
.Length
<= ACPI_FADT_V2_SIZE
)
646 AcpiGbl_FADT
.PreferredProfile
= 0;
647 AcpiGbl_FADT
.PstateControl
= 0;
648 AcpiGbl_FADT
.CstControl
= 0;
649 AcpiGbl_FADT
.BootFlags
= 0;
653 * Now we can update the local FADT length to the length of the
654 * current FADT version as defined by the ACPI specification.
655 * Thus, we will have a common FADT internally.
657 AcpiGbl_FADT
.Header
.Length
= sizeof (ACPI_TABLE_FADT
);
660 * Expand the 32-bit DSDT addresses to 64-bit as necessary.
661 * Later ACPICA code will always use the X 64-bit field.
663 AcpiGbl_FADT
.XDsdt
= AcpiTbSelectAddress ("DSDT",
664 AcpiGbl_FADT
.Dsdt
, AcpiGbl_FADT
.XDsdt
);
666 /* If Hardware Reduced flag is set, we are all done */
668 if (AcpiGbl_ReducedHardware
)
673 /* Examine all of the 64-bit extended address fields (X fields) */
675 for (i
= 0; i
< ACPI_FADT_INFO_ENTRIES
; i
++)
678 * Get the 32-bit and 64-bit addresses, as well as the register
679 * length and register name.
681 Address32
= *ACPI_ADD_PTR (UINT32
,
682 &AcpiGbl_FADT
, FadtInfoTable
[i
].Address32
);
684 Address64
= ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS
,
685 &AcpiGbl_FADT
, FadtInfoTable
[i
].Address64
);
687 Length
= *ACPI_ADD_PTR (UINT8
,
688 &AcpiGbl_FADT
, FadtInfoTable
[i
].Length
);
690 Name
= FadtInfoTable
[i
].Name
;
691 Flags
= FadtInfoTable
[i
].Flags
;
694 * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
695 * generic address structures as necessary. Later code will always use
696 * the 64-bit address structures.
699 * Now always use the 64-bit address if it is valid (non-zero), in
700 * accordance with the ACPI specification which states that a 64-bit
701 * address supersedes the 32-bit version. This behavior can be
702 * overridden by the AcpiGbl_Use32BitFadtAddresses flag.
704 * During 64-bit address construction and verification,
705 * these cases are handled:
707 * Address32 zero, Address64 [don't care] - Use Address64
709 * No override: if AcpiGbl_Use32BitFadtAddresses is FALSE, and:
710 * Address32 non-zero, Address64 zero - Copy/use Address32
711 * Address32 non-zero == Address64 non-zero - Use Address64
712 * Address32 non-zero != Address64 non-zero - Warning, use Address64
714 * Override: if AcpiGbl_Use32BitFadtAddresses is TRUE, and:
715 * Address32 non-zero, Address64 zero - Copy/use Address32
716 * Address32 non-zero == Address64 non-zero - Copy/use Address32
717 * Address32 non-zero != Address64 non-zero - Warning, copy/use Address32
719 * Note: SpaceId is always I/O for 32-bit legacy address fields
723 if (Address64
->Address
)
725 if (Address64
->Address
!= (UINT64
) Address32
)
727 /* Address mismatch */
729 ACPI_BIOS_WARNING ((AE_INFO
,
730 "32/64X address mismatch in FADT/%s: "
731 "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
733 ACPI_FORMAT_UINT64 (Address64
->Address
),
734 AcpiGbl_Use32BitFadtAddresses
? 32 : 64));
738 * For each extended field, check for length mismatch
739 * between the legacy length field and the corresponding
740 * 64-bit X length field.
741 * Note: If the legacy length field is > 0xFF bits, ignore
742 * this check. (GPE registers can be larger than the
743 * 64-bit GAS structure can accomodate, 0xFF bits).
745 if ((ACPI_MUL_8 (Length
) <= ACPI_UINT8_MAX
) &&
746 (Address64
->BitWidth
!= ACPI_MUL_8 (Length
)))
748 ACPI_BIOS_WARNING ((AE_INFO
,
749 "32/64X length mismatch in FADT/%s: %u/%u",
750 Name
, ACPI_MUL_8 (Length
), Address64
->BitWidth
));
755 * Hardware register access code always uses the 64-bit fields.
756 * So if the 64-bit field is zero or is to be overridden,
757 * initialize it with the 32-bit fields.
758 * Note that when the 32-bit address favor is specified, the
759 * 64-bit fields are always re-initialized so that
760 * AccessSize/BitWidth/BitOffset fields can be correctly
761 * configured to the values to trigger a 32-bit compatible
762 * access mode in the hardware register access code.
764 if (!Address64
->Address
|| AcpiGbl_Use32BitFadtAddresses
)
766 AcpiTbInitGenericAddress (Address64
,
767 ACPI_ADR_SPACE_SYSTEM_IO
, Length
,
768 (UINT64
) Address32
, Name
, Flags
);
772 if (FadtInfoTable
[i
].Flags
& ACPI_FADT_REQUIRED
)
775 * Field is required (PM1aEvent, PM1aControl).
776 * Both the address and length must be non-zero.
778 if (!Address64
->Address
|| !Length
)
780 ACPI_BIOS_ERROR ((AE_INFO
,
781 "Required FADT field %s has zero address and/or length: "
783 Name
, ACPI_FORMAT_UINT64 (Address64
->Address
), Length
));
786 else if (FadtInfoTable
[i
].Flags
& ACPI_FADT_SEPARATE_LENGTH
)
789 * Field is optional (PM2Control, GPE0, GPE1) AND has its own
790 * length field. If present, both the address and length must
793 if ((Address64
->Address
&& !Length
) ||
794 (!Address64
->Address
&& Length
))
796 ACPI_BIOS_WARNING ((AE_INFO
,
797 "Optional FADT field %s has valid %s but zero %s: "
798 "0x%8.8X%8.8X/0x%X", Name
,
799 (Length
? "Length" : "Address"),
800 (Length
? "Address": "Length"),
801 ACPI_FORMAT_UINT64 (Address64
->Address
), Length
));
808 /*******************************************************************************
810 * FUNCTION: AcpiTbSetupFadtRegisters
812 * PARAMETERS: None, uses AcpiGbl_FADT.
816 * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
817 * force FADT register definitions to their default lengths.
819 ******************************************************************************/
822 AcpiTbSetupFadtRegisters (
825 ACPI_GENERIC_ADDRESS
*Target64
;
826 ACPI_GENERIC_ADDRESS
*Source64
;
827 UINT8 Pm1RegisterByteWidth
;
832 * Optionally check all register lengths against the default values and
833 * update them if they are incorrect.
835 if (AcpiGbl_UseDefaultRegisterWidths
)
837 for (i
= 0; i
< ACPI_FADT_INFO_ENTRIES
; i
++)
839 Target64
= ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS
, &AcpiGbl_FADT
,
840 FadtInfoTable
[i
].Address64
);
843 * If a valid register (Address != 0) and the (DefaultLength > 0)
844 * (Not a GPE register), then check the width against the default.
846 if ((Target64
->Address
) &&
847 (FadtInfoTable
[i
].DefaultLength
> 0) &&
848 (FadtInfoTable
[i
].DefaultLength
!= Target64
->BitWidth
))
850 ACPI_BIOS_WARNING ((AE_INFO
,
851 "Invalid length for FADT/%s: %u, using default %u",
852 FadtInfoTable
[i
].Name
, Target64
->BitWidth
,
853 FadtInfoTable
[i
].DefaultLength
));
855 /* Incorrect size, set width to the default */
857 Target64
->BitWidth
= FadtInfoTable
[i
].DefaultLength
;
863 * Get the length of the individual PM1 registers (enable and status).
864 * Each register is defined to be (event block length / 2). Extra divide
865 * by 8 converts bits to bytes.
867 Pm1RegisterByteWidth
= (UINT8
)
868 ACPI_DIV_16 (AcpiGbl_FADT
.XPm1aEventBlock
.BitWidth
);
871 * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
872 * registers. These addresses do not appear (directly) in the FADT, so it
873 * is useful to pre-calculate them from the PM1 Event Block definitions.
875 * The PM event blocks are split into two register blocks, first is the
876 * PM Status Register block, followed immediately by the PM Enable
877 * Register block. Each is of length (Pm1EventLength/2)
879 * Note: The PM1A event block is required by the ACPI specification.
880 * However, the PM1B event block is optional and is rarely, if ever,
884 for (i
= 0; i
< ACPI_FADT_PM_INFO_ENTRIES
; i
++)
886 Source64
= ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS
, &AcpiGbl_FADT
,
887 FadtPmInfoTable
[i
].Source
);
889 if (Source64
->Address
)
891 AcpiTbInitGenericAddress (FadtPmInfoTable
[i
].Target
,
892 Source64
->SpaceId
, Pm1RegisterByteWidth
,
894 (FadtPmInfoTable
[i
].RegisterNum
* Pm1RegisterByteWidth
),