drivers/acpica/tbfadt.c

0001 /******************************************************************************
0002  *
0003  * Module Name: tbfadt   - FADT table utilities
0004  *
0005  *****************************************************************************/
0006
0007 /******************************************************************************
0008  *
0009  * 1. Copyright Notice
0010  *
0011  * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
0012  * All rights reserved.
0013  *
0014  * 2. License
0015  *
0016  * 2.1. This is your license from Intel Corp. under its intellectual property
0017  * rights.  You may have additional license terms from the party that provided
0018  * you this software, covering your right to use that party's intellectual
0019  * property rights.
0020  *
0021  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
0022  * copy of the source code appearing in this file ("Covered Code") an
0023  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
0024  * base code distributed originally by Intel ("Original Intel Code") to copy,
0025  * make derivatives, distribute, use and display any portion of the Covered
0026  * Code in any form, with the right to sublicense such rights; and
0027  *
0028  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
0029  * license (with the right to sublicense), under only those claims of Intel
0030  * patents that are infringed by the Original Intel Code, to make, use, sell,
0031  * offer to sell, and import the Covered Code and derivative works thereof
0032  * solely to the minimum extent necessary to exercise the above copyright
0033  * license, and in no event shall the patent license extend to any additions
0034  * to or modifications of the Original Intel Code.  No other license or right
0035  * is granted directly or by implication, estoppel or otherwise;
0036  *
0037  * The above copyright and patent license is granted only if the following
0038  * conditions are met:
0039  *
0040  * 3. Conditions
0041  *
0042  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
0043  * Redistribution of source code of any substantial portion of the Covered
0044  * Code or modification with rights to further distribute source must include
0045  * the above Copyright Notice, the above License, this list of Conditions,
0046  * and the following Disclaimer and Export Compliance provision.  In addition,
0047  * Licensee must cause all Covered Code to which Licensee contributes to
0048  * contain a file documenting the changes Licensee made to create that Covered
0049  * Code and the date of any change.  Licensee must include in that file the
0050  * documentation of any changes made by any predecessor Licensee.  Licensee
0051  * must include a prominent statement that the modification is derived,
0052  * directly or indirectly, from Original Intel Code.
0053  *
0054  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
0055  * Redistribution of source code of any substantial portion of the Covered
0056  * Code or modification without rights to further distribute source must
0057  * include the following Disclaimer and Export Compliance provision in the
0058  * documentation and/or other materials provided with distribution.  In
0059  * addition, Licensee may not authorize further sublicense of source of any
0060  * portion of the Covered Code, and must include terms to the effect that the
0061  * license from Licensee to its licensee is limited to the intellectual
0062  * property embodied in the software Licensee provides to its licensee, and
0063  * not to intellectual property embodied in modifications its licensee may
0064  * make.
0065  *
0066  * 3.3. Redistribution of Executable. Redistribution in executable form of any
0067  * substantial portion of the Covered Code or modification must reproduce the
0068  * above Copyright Notice, and the following Disclaimer and Export Compliance
0069  * provision in the documentation and/or other materials provided with the
0070  * distribution.
0071  *
0072  * 3.4. Intel retains all right, title, and interest in and to the Original
0073  * Intel Code.
0074  *
0075  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
0076  * Intel shall be used in advertising or otherwise to promote the sale, use or
0077  * other dealings in products derived from or relating to the Covered Code
0078  * without prior written authorization from Intel.
0079  *
0080  * 4. Disclaimer and Export Compliance
0081  *
0082  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
0083  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
0084  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
0085  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
0086  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
0087  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
0088  * PARTICULAR PURPOSE.
0089  *
0090  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
0091  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
0092  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
0093  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
0094  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
0095  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
0096  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
0097  * LIMITED REMEDY.
0098  *
0099  * 4.3. Licensee shall not export, either directly or indirectly, any of this
0100  * software or system incorporating such software without first obtaining any
0101  * required license or other approval from the U. S. Department of Commerce or
0102  * any other agency or department of the United States Government.  In the
0103  * event Licensee exports any such software from the United States or
0104  * re-exports any such software from a foreign destination, Licensee shall
0105  * ensure that the distribution and export/re-export of the software is in
0106  * compliance with all laws, regulations, orders, or other restrictions of the
0107  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
0108  * any of its subsidiaries will export/re-export any technical data, process,
0109  * software, or service, directly or indirectly, to any country for which the
0110  * United States government or any agency thereof requires an export license,
0111  * other governmental approval, or letter of assurance, without first obtaining
0112  * such license, approval or letter.
0113  *
0114  *****************************************************************************/
0115
0116 #define __TBFADT_C__
0117
0118 #include "acpi.h"
0119 #include "accommon.h"
0120 #include "actables.h"
0121
0122 #define _COMPONENT          ACPI_TABLES
0123         ACPI_MODULE_NAME    ("tbfadt")
0124
0125 /* Local prototypes */
0126
0127 static inline void
0128 AcpiTbInitGenericAddress (
0129     ACPI_GENERIC_ADDRESS    *GenericAddress,
0130     UINT8                   SpaceId,
0131     UINT8                   ByteWidth,
0132     UINT64                  Address);
0133
0134 static void
0135 AcpiTbConvertFadt (
0136     void);
0137
0138 static void
0139 AcpiTbValidateFadt (
0140     void);
0141
0142 static void
0143 AcpiTbSetupFadtRegisters (
0144     void);
0145
0146
0147 /* Table for conversion of FADT to common internal format and FADT validation */
0148
0149 typedef struct acpi_fadt_info
0150 {
0151     char                    *Name;
0152     UINT8                   Address64;
0153     UINT8                   Address32;
0154     UINT8                   Length;
0155     UINT8                   DefaultLength;
0156     UINT8                   Type;
0157
0158 } ACPI_FADT_INFO;
0159
0160 #define ACPI_FADT_REQUIRED          1
0161 #define ACPI_FADT_SEPARATE_LENGTH   2
0162
0163 static ACPI_FADT_INFO     FadtInfoTable[] =
0164 {
0165     {"Pm1aEventBlock",
0166         ACPI_FADT_OFFSET (XPm1aEventBlock),
0167         ACPI_FADT_OFFSET (Pm1aEventBlock),
0168         ACPI_FADT_OFFSET (Pm1EventLength),
0169         ACPI_PM1_REGISTER_WIDTH * 2,        /* Enable + Status register */
0170         ACPI_FADT_REQUIRED},
0171
0172     {"Pm1bEventBlock",
0173         ACPI_FADT_OFFSET (XPm1bEventBlock),
0174         ACPI_FADT_OFFSET (Pm1bEventBlock),
0175         ACPI_FADT_OFFSET (Pm1EventLength),
0176         ACPI_PM1_REGISTER_WIDTH * 2,        /* Enable + Status register */
0177         0},
0178
0179     {"Pm1aControlBlock",
0180         ACPI_FADT_OFFSET (XPm1aControlBlock),
0181         ACPI_FADT_OFFSET (Pm1aControlBlock),
0182         ACPI_FADT_OFFSET (Pm1ControlLength),
0183         ACPI_PM1_REGISTER_WIDTH,
0184         ACPI_FADT_REQUIRED},
0185
0186     {"Pm1bControlBlock",
0187         ACPI_FADT_OFFSET (XPm1bControlBlock),
0188         ACPI_FADT_OFFSET (Pm1bControlBlock),
0189         ACPI_FADT_OFFSET (Pm1ControlLength),
0190         ACPI_PM1_REGISTER_WIDTH,
0191         0},
0192
0193     {"Pm2ControlBlock",
0194         ACPI_FADT_OFFSET (XPm2ControlBlock),
0195         ACPI_FADT_OFFSET (Pm2ControlBlock),
0196         ACPI_FADT_OFFSET (Pm2ControlLength),
0197         ACPI_PM2_REGISTER_WIDTH,
0198         ACPI_FADT_SEPARATE_LENGTH},
0199
0200     {"PmTimerBlock",
0201         ACPI_FADT_OFFSET (XPmTimerBlock),
0202         ACPI_FADT_OFFSET (PmTimerBlock),
0203         ACPI_FADT_OFFSET (PmTimerLength),
0204         ACPI_PM_TIMER_WIDTH,
0205         ACPI_FADT_REQUIRED},
0206
0207     {"Gpe0Block",
0208         ACPI_FADT_OFFSET (XGpe0Block),
0209         ACPI_FADT_OFFSET (Gpe0Block),
0210         ACPI_FADT_OFFSET (Gpe0BlockLength),
0211         0,
0212         ACPI_FADT_SEPARATE_LENGTH},
0213
0214     {"Gpe1Block",
0215         ACPI_FADT_OFFSET (XGpe1Block),
0216         ACPI_FADT_OFFSET (Gpe1Block),
0217         ACPI_FADT_OFFSET (Gpe1BlockLength),
0218         0,
0219         ACPI_FADT_SEPARATE_LENGTH}
0220 };
0221
0222 #define ACPI_FADT_INFO_ENTRIES \
0223             (sizeof (FadtInfoTable) / sizeof (ACPI_FADT_INFO))
0224
0225
0226 /* Table used to split Event Blocks into separate status/enable registers */
0227
0228 typedef struct acpi_fadt_pm_info
0229 {
0230     ACPI_GENERIC_ADDRESS    *Target;
0231     UINT8                   Source;
0232     UINT8                   RegisterNum;
0233
0234 } ACPI_FADT_PM_INFO;
0235
0236 static ACPI_FADT_PM_INFO    FadtPmInfoTable[] =
0237 {
0238     {&AcpiGbl_XPm1aStatus,
0239         ACPI_FADT_OFFSET (XPm1aEventBlock),
0240         0},
0241
0242     {&AcpiGbl_XPm1aEnable,
0243         ACPI_FADT_OFFSET (XPm1aEventBlock),
0244         1},
0245
0246     {&AcpiGbl_XPm1bStatus,
0247         ACPI_FADT_OFFSET (XPm1bEventBlock),
0248         0},
0249
0250     {&AcpiGbl_XPm1bEnable,
0251         ACPI_FADT_OFFSET (XPm1bEventBlock),
0252         1}
0253 };
0254
0255 #define ACPI_FADT_PM_INFO_ENTRIES \
0256             (sizeof (FadtPmInfoTable) / sizeof (ACPI_FADT_PM_INFO))
0257
0258
0259 /*******************************************************************************
0260  *
0261  * FUNCTION:    AcpiTbInitGenericAddress
0262  *
0263  * PARAMETERS:  GenericAddress      - GAS struct to be initialized
0264  *              SpaceId             - ACPI Space ID for this register
0265  *              ByteWidth           - Width of this register, in bytes
0266  *              Address             - Address of the register
0267  *
0268  * RETURN:      None
0269  *
0270  * DESCRIPTION: Initialize a Generic Address Structure (GAS)
0271  *              See the ACPI specification for a full description and
0272  *              definition of this structure.
0273  *
0274  ******************************************************************************/
0275
0276 static inline void
0277 AcpiTbInitGenericAddress (
0278     ACPI_GENERIC_ADDRESS    *GenericAddress,
0279     UINT8                   SpaceId,
0280     UINT8                   ByteWidth,
0281     UINT64                  Address)
0282 {
0283
0284     /*
0285      * The 64-bit Address field is non-aligned in the byte packed
0286      * GAS struct.
0287      */
0288     ACPI_MOVE_64_TO_64 (&GenericAddress->Address, &Address);
0289
0290     /* All other fields are byte-wide */
0291
0292     GenericAddress->SpaceId = SpaceId;
0293     GenericAddress->BitWidth = (UINT8) ACPI_MUL_8 (ByteWidth);
0294     GenericAddress->BitOffset = 0;
0295     GenericAddress->AccessWidth = 0; /* Access width ANY */
0296 }
0297
0298
0299 /*******************************************************************************
0300  *
0301  * FUNCTION:    AcpiTbParseFadt
0302  *
0303  * PARAMETERS:  TableIndex          - Index for the FADT
0304  *
0305  * RETURN:      None
0306  *
0307  * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
0308  *              (FADT contains the addresses of the DSDT and FACS)
0309  *
0310  ******************************************************************************/
0311
0312 void
0313 AcpiTbParseFadt (
0314     UINT32                  TableIndex)
0315 {
0316     UINT32                  Length;
0317     ACPI_TABLE_HEADER       *Table;
0318
0319
0320     /*
0321      * The FADT has multiple versions with different lengths,
0322      * and it contains pointers to both the DSDT and FACS tables.
0323      *
0324      * Get a local copy of the FADT and convert it to a common format
0325      * Map entire FADT, assumed to be smaller than one page.
0326      */
0327     Length = AcpiGbl_RootTableList.Tables[TableIndex].Length;
0328
0329     Table = AcpiOsMapMemory (
0330                 AcpiGbl_RootTableList.Tables[TableIndex].Address, Length);
0331     if (!Table)
0332     {
0333         return;
0334     }
0335
0336     /*
0337      * Validate the FADT checksum before we copy the table. Ignore
0338      * checksum error as we want to try to get the DSDT and FACS.
0339      */
0340     (void) AcpiTbVerifyChecksum (Table, Length);
0341
0342     /* Create a local copy of the FADT in common ACPI 2.0+ format */
0343
0344     AcpiTbCreateLocalFadt (Table, Length);
0345
0346     /* All done with the real FADT, unmap it */
0347
0348     AcpiOsUnmapMemory (Table, Length);
0349
0350     /* Obtain the DSDT and FACS tables via their addresses within the FADT */
0351
0352     AcpiTbInstallTable ((ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.XDsdt,
0353         ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
0354
0355     AcpiTbInstallTable ((ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.XFacs,
0356         ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);
0357 }
0358
0359
0360 /*******************************************************************************
0361  *
0362  * FUNCTION:    AcpiTbCreateLocalFadt
0363  *
0364  * PARAMETERS:  Table               - Pointer to BIOS FADT
0365  *              Length              - Length of the table
0366  *
0367  * RETURN:      None
0368  *
0369  * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
0370  *              Performs validation on some important FADT fields.
0371  *
0372  * NOTE:        We create a local copy of the FADT regardless of the version.
0373  *
0374  ******************************************************************************/
0375
0376 void
0377 AcpiTbCreateLocalFadt (
0378     ACPI_TABLE_HEADER       *Table,
0379     UINT32                  Length)
0380 {
0381
0382     /*
0383      * Check if the FADT is larger than the largest table that we expect
0384      * (the ACPI 2.0/3.0 version). If so, truncate the table, and issue
0385      * a warning.
0386      */
0387     if (Length > sizeof (ACPI_TABLE_FADT))
0388     {
0389         ACPI_WARNING ((AE_INFO,
0390             "FADT (revision %u) is longer than ACPI 2.0 version, "
0391             "truncating length 0x%X to 0x%X",
0392             Table->Revision, Length, (UINT32) sizeof (ACPI_TABLE_FADT)));
0393     }
0394
0395     /* Clear the entire local FADT */
0396
0397     ACPI_MEMSET (&AcpiGbl_FADT, 0, sizeof (ACPI_TABLE_FADT));
0398
0399     /* Copy the original FADT, up to sizeof (ACPI_TABLE_FADT) */
0400
0401     ACPI_MEMCPY (&AcpiGbl_FADT, Table,
0402         ACPI_MIN (Length, sizeof (ACPI_TABLE_FADT)));
0403
0404     /* Convert the local copy of the FADT to the common internal format */
0405
0406     AcpiTbConvertFadt ();
0407
0408     /* Validate FADT values now, before we make any changes */
0409
0410     AcpiTbValidateFadt ();
0411
0412     /* Initialize the global ACPI register structures */
0413
0414     AcpiTbSetupFadtRegisters ();
0415 }
0416
0417
0418 /*******************************************************************************
0419  *
0420  * FUNCTION:    AcpiTbConvertFadt
0421  *
0422  * PARAMETERS:  None, uses AcpiGbl_FADT
0423  *
0424  * RETURN:      None
0425  *
0426  * DESCRIPTION: Converts all versions of the FADT to a common internal format.
0427  *              Expand 32-bit addresses to 64-bit as necessary.
0428  *
0429  * NOTE:        AcpiGbl_FADT must be of size (ACPI_TABLE_FADT),
0430  *              and must contain a copy of the actual FADT.
0431  *
0432  * Notes on 64-bit register addresses:
0433  *
0434  * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
0435  * fields of the FADT for all ACPI register addresses.
0436  *
0437  * The 64-bit "X" fields are optional extensions to the original 32-bit FADT
0438  * V1.0 fields. Even if they are present in the FADT, they are optional and
0439  * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
0440  * 32-bit V1.0 fields if the corresponding X field is zero.
0441  *
0442  * For ACPI 1.0 FADTs, all 32-bit address fields are expanded to the
0443  * corresponding "X" fields in the internal FADT.
0444  *
0445  * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
0446  * to the corresponding 64-bit X fields. For compatibility with other ACPI
0447  * implementations, we ignore the 64-bit field if the 32-bit field is valid,
0448  * regardless of whether the host OS is 32-bit or 64-bit.
0449  *
0450  ******************************************************************************/
0451
0452 static void
0453 AcpiTbConvertFadt (
0454     void)
0455 {
0456     ACPI_GENERIC_ADDRESS    *Address64;
0457     UINT32                  Address32;
0458     UINT32                  i;
0459
0460
0461     /* Update the local FADT table header length */
0462
0463     AcpiGbl_FADT.Header.Length = sizeof (ACPI_TABLE_FADT);
0464
0465     /*
0466      * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
0467      * Later code will always use the X 64-bit field.
0468      */
0469     if (!AcpiGbl_FADT.XFacs)
0470     {
0471         AcpiGbl_FADT.XFacs = (UINT64) AcpiGbl_FADT.Facs;
0472     }
0473     if (!AcpiGbl_FADT.XDsdt)
0474     {
0475         AcpiGbl_FADT.XDsdt = (UINT64) AcpiGbl_FADT.Dsdt;
0476     }
0477
0478     /*
0479      * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
0480      * should be zero are indeed zero. This will workaround BIOSs that
0481      * inadvertently place values in these fields.
0482      *
0483      * The ACPI 1.0 reserved fields that will be zeroed are the bytes located
0484      * at offset 45, 55, 95, and the word located at offset 109, 110.
0485      */
0486     if (AcpiGbl_FADT.Header.Revision < 3)
0487     {
0488         AcpiGbl_FADT.PreferredProfile = 0;
0489         AcpiGbl_FADT.PstateControl = 0;
0490         AcpiGbl_FADT.CstControl = 0;
0491         AcpiGbl_FADT.BootFlags = 0;
0492     }
0493
0494     /*
0495      * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
0496      * generic address structures as necessary. Later code will always use
0497      * the 64-bit address structures.
0498      *
0499      * March 2009:
0500      * We now always use the 32-bit address if it is valid (non-null). This
0501      * is not in accordance with the ACPI specification which states that
0502      * the 64-bit address supersedes the 32-bit version, but we do this for
0503      * compatibility with other ACPI implementations. Most notably, in the
0504      * case where both the 32 and 64 versions are non-null, we use the 32-bit
0505      * version. This is the only address that is guaranteed to have been
0506      * tested by the BIOS manufacturer.
0507      */
0508     for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++)
0509     {
0510         Address32 = *ACPI_ADD_PTR (UINT32,
0511             &AcpiGbl_FADT, FadtInfoTable[i].Address32);
0512
0513         Address64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS,
0514             &AcpiGbl_FADT, FadtInfoTable[i].Address64);
0515
0516         /*
0517          * If both 32- and 64-bit addresses are valid (non-zero),
0518          * they must match.
0519          */
0520         if (Address64->Address && Address32 &&
0521            (Address64->Address != (UINT64) Address32))
0522         {
0523             ACPI_ERROR ((AE_INFO,
0524                 "32/64X address mismatch in %s: %8.8X/%8.8X%8.8X, using 32",
0525                 FadtInfoTable[i].Name, Address32,
0526                 ACPI_FORMAT_UINT64 (Address64->Address)));
0527         }
0528
0529         /* Always use 32-bit address if it is valid (non-null) */
0530
0531         if (Address32)
0532         {
0533             /*
0534              * Copy the 32-bit address to the 64-bit GAS structure. The
0535              * Space ID is always I/O for 32-bit legacy address fields
0536              */
0537             AcpiTbInitGenericAddress (Address64, ACPI_ADR_SPACE_SYSTEM_IO,
0538                 *ACPI_ADD_PTR (UINT8, &AcpiGbl_FADT, FadtInfoTable[i].Length),
0539                 (UINT64) Address32);
0540         }
0541     }
0542 }
0543
0544
0545 /*******************************************************************************
0546  *
0547  * FUNCTION:    AcpiTbValidateFadt
0548  *
0549  * PARAMETERS:  Table           - Pointer to the FADT to be validated
0550  *
0551  * RETURN:      None
0552  *
0553  * DESCRIPTION: Validate various important fields within the FADT. If a problem
0554  *              is found, issue a message, but no status is returned.
0555  *              Used by both the table manager and the disassembler.
0556  *
0557  * Possible additional checks:
0558  * (AcpiGbl_FADT.Pm1EventLength >= 4)
0559  * (AcpiGbl_FADT.Pm1ControlLength >= 2)
0560  * (AcpiGbl_FADT.PmTimerLength >= 4)
0561  * Gpe block lengths must be multiple of 2
0562  *
0563  ******************************************************************************/
0564
0565 static void
0566 AcpiTbValidateFadt (
0567     void)
0568 {
0569     char                    *Name;
0570     ACPI_GENERIC_ADDRESS    *Address64;
0571     UINT8                   Length;
0572     UINT32                  i;
0573
0574
0575     /*
0576      * Check for FACS and DSDT address mismatches. An address mismatch between
0577      * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
0578      * DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables.
0579      */
0580     if (AcpiGbl_FADT.Facs &&
0581         (AcpiGbl_FADT.XFacs != (UINT64) AcpiGbl_FADT.Facs))
0582     {
0583         ACPI_WARNING ((AE_INFO,
0584             "32/64X FACS address mismatch in FADT - "
0585             "%8.8X/%8.8X%8.8X, using 32",
0586             AcpiGbl_FADT.Facs, ACPI_FORMAT_UINT64 (AcpiGbl_FADT.XFacs)));
0587
0588         AcpiGbl_FADT.XFacs = (UINT64) AcpiGbl_FADT.Facs;
0589     }
0590
0591     if (AcpiGbl_FADT.Dsdt &&
0592         (AcpiGbl_FADT.XDsdt != (UINT64) AcpiGbl_FADT.Dsdt))
0593     {
0594         ACPI_WARNING ((AE_INFO,
0595             "32/64X DSDT address mismatch in FADT - "
0596             "%8.8X/%8.8X%8.8X, using 32",
0597             AcpiGbl_FADT.Dsdt, ACPI_FORMAT_UINT64 (AcpiGbl_FADT.XDsdt)));
0598
0599         AcpiGbl_FADT.XDsdt = (UINT64) AcpiGbl_FADT.Dsdt;
0600     }
0601
0602     /* Examine all of the 64-bit extended address fields (X fields) */
0603
0604     for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++)
0605     {
0606         /*
0607          * Generate pointer to the 64-bit address, get the register
0608          * length (width) and the register name
0609          */
0610         Address64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS,
0611                         &AcpiGbl_FADT, FadtInfoTable[i].Address64);
0612         Length = *ACPI_ADD_PTR (UINT8,
0613                         &AcpiGbl_FADT, FadtInfoTable[i].Length);
0614         Name = FadtInfoTable[i].Name;
0615
0616         /*
0617          * For each extended field, check for length mismatch between the
0618          * legacy length field and the corresponding 64-bit X length field.
0619          */
0620         if (Address64->Address &&
0621            (Address64->BitWidth != ACPI_MUL_8 (Length)))
0622         {
0623             ACPI_WARNING ((AE_INFO,
0624                 "32/64X length mismatch in %s: %d/%d",
0625                 Name, ACPI_MUL_8 (Length), Address64->BitWidth));
0626         }
0627
0628         if (FadtInfoTable[i].Type & ACPI_FADT_REQUIRED)
0629         {
0630             /*
0631              * Field is required (PM1aEvent, PM1aControl, PmTimer).
0632              * Both the address and length must be non-zero.
0633              */
0634             if (!Address64->Address || !Length)
0635             {
0636                 ACPI_ERROR ((AE_INFO,
0637                     "Required field %s has zero address and/or length:"
0638                     " %8.8X%8.8X/%X",
0639                     Name, ACPI_FORMAT_UINT64 (Address64->Address), Length));
0640             }
0641         }
0642         else if (FadtInfoTable[i].Type & ACPI_FADT_SEPARATE_LENGTH)
0643         {
0644             /*
0645              * Field is optional (PM2Control, GPE0, GPE1) AND has its own
0646              * length field. If present, both the address and length must
0647              * be valid.
0648              */
0649             if ((Address64->Address && !Length) ||
0650                 (!Address64->Address && Length))
0651             {
0652                 ACPI_WARNING ((AE_INFO,
0653                     "Optional field %s has zero address or length: "
0654                     "%8.8X%8.8X/%X",
0655                     Name, ACPI_FORMAT_UINT64 (Address64->Address), Length));
0656             }
0657         }
0658     }
0659 }
0660
0661
0662 /*******************************************************************************
0663  *
0664  * FUNCTION:    AcpiTbSetupFadtRegisters
0665  *
0666  * PARAMETERS:  None, uses AcpiGbl_FADT.
0667  *
0668  * RETURN:      None
0669  *
0670  * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
0671  *              force FADT register definitions to their default lengths.
0672  *
0673  ******************************************************************************/
0674
0675 static void
0676 AcpiTbSetupFadtRegisters (
0677     void)
0678 {
0679     ACPI_GENERIC_ADDRESS    *Target64;
0680     ACPI_GENERIC_ADDRESS    *Source64;
0681     UINT8                   Pm1RegisterByteWidth;
0682     UINT32                  i;
0683
0684
0685     /*
0686      * Optionally check all register lengths against the default values and
0687      * update them if they are incorrect.
0688      */
0689     if (AcpiGbl_UseDefaultRegisterWidths)
0690     {
0691         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++)
0692         {
0693             Target64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS, &AcpiGbl_FADT,
0694                 FadtInfoTable[i].Address64);
0695
0696             /*
0697              * If a valid register (Address != 0) and the (DefaultLength > 0)
0698              * (Not a GPE register), then check the width against the default.
0699              */
0700             if ((Target64->Address) &&
0701                 (FadtInfoTable[i].DefaultLength > 0) &&
0702                 (FadtInfoTable[i].DefaultLength != Target64->BitWidth))
0703             {
0704                 ACPI_WARNING ((AE_INFO,
0705                     "Invalid length for %s: %d, using default %d",
0706                     FadtInfoTable[i].Name, Target64->BitWidth,
0707                     FadtInfoTable[i].DefaultLength));
0708
0709                 /* Incorrect size, set width to the default */
0710
0711                 Target64->BitWidth = FadtInfoTable[i].DefaultLength;
0712             }
0713         }
0714     }
0715
0716     /*
0717      * Get the length of the individual PM1 registers (enable and status).
0718      * Each register is defined to be (event block length / 2). Extra divide
0719      * by 8 converts bits to bytes.
0720      */
0721     Pm1RegisterByteWidth = (UINT8)
0722         ACPI_DIV_16 (AcpiGbl_FADT.XPm1aEventBlock.BitWidth);
0723
0724     /*
0725      * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
0726      * registers. These addresses do not appear (directly) in the FADT, so it
0727      * is useful to pre-calculate them from the PM1 Event Block definitions.
0728      *
0729      * The PM event blocks are split into two register blocks, first is the
0730      * PM Status Register block, followed immediately by the PM Enable
0731      * Register block. Each is of length (Pm1EventLength/2)
0732      *
0733      * Note: The PM1A event block is required by the ACPI specification.
0734      * However, the PM1B event block is optional and is rarely, if ever,
0735      * used.
0736      */
0737
0738     for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++)
0739     {
0740         Source64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS, &AcpiGbl_FADT,
0741             FadtPmInfoTable[i].Source);
0742
0743         if (Source64->Address)
0744         {
0745             AcpiTbInitGenericAddress (FadtPmInfoTable[i].Target,
0746                 Source64->SpaceId, Pm1RegisterByteWidth,
0747                 Source64->Address +
0748                     (FadtPmInfoTable[i].RegisterNum * Pm1RegisterByteWidth));
0749         }
0750     }
0751 }
0752