components/tables/tbinstal.c

/******************************************************************************
 *
 * Module Name: tbinstal - ACPI table installation and removal
 *              $Revision: 39 $
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.
 * All rights reserved.
 *
 * 2. License
 *
 * 2.1. This is your license from Intel Corp. under its intellectual property
 * rights.  You may have additional license terms from the party that provided
 * you this software, covering your right to use that party's intellectual
 * property rights.
 *
 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
 * copy of the source code appearing in this file ("Covered Code") an
 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
 * base code distributed originally by Intel ("Original Intel Code") to copy,
 * make derivatives, distribute, use and display any portion of the Covered
 * Code in any form, with the right to sublicense such rights; and
 *
 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
 * license (with the right to sublicense), under only those claims of Intel
 * patents that are infringed by the Original Intel Code, to make, use, sell,
 * offer to sell, and import the Covered Code and derivative works thereof
 * solely to the minimum extent necessary to exercise the above copyright
 * license, and in no event shall the patent license extend to any additions
 * to or modifications of the Original Intel Code.  No other license or right
 * is granted directly or by implication, estoppel or otherwise;
 *
 * The above copyright and patent license is granted only if the following
 * conditions are met:
 *
 * 3. Conditions
 *
 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
 * Redistribution of source code of any substantial portion of the Covered
 * Code or modification with rights to further distribute source must include
 * the above Copyright Notice, the above License, this list of Conditions,
 * and the following Disclaimer and Export Compliance provision.  In addition,
 * Licensee must cause all Covered Code to which Licensee contributes to
 * contain a file documenting the changes Licensee made to create that Covered
 * Code and the date of any change.  Licensee must include in that file the
 * documentation of any changes made by any predecessor Licensee.  Licensee
 * must include a prominent statement that the modification is derived,
 * directly or indirectly, from Original Intel Code.
 *
 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
 * Redistribution of source code of any substantial portion of the Covered
 * Code or modification without rights to further distribute source must
 * include the following Disclaimer and Export Compliance provision in the
 * documentation and/or other materials provided with distribution.  In
 * addition, Licensee may not authorize further sublicense of source of any
 * portion of the Covered Code, and must include terms to the effect that the
 * license from Licensee to its licensee is limited to the intellectual
 * property embodied in the software Licensee provides to its licensee, and
 * not to intellectual property embodied in modifications its licensee may
 * make.
 *
 * 3.3. Redistribution of Executable. Redistribution in executable form of any
 * substantial portion of the Covered Code or modification must reproduce the
 * above Copyright Notice, and the following Disclaimer and Export Compliance
 * provision in the documentation and/or other materials provided with the
 * distribution.
 *
 * 3.4. Intel retains all right, title, and interest in and to the Original
 * Intel Code.
 *
 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
 * Intel shall be used in advertising or otherwise to promote the sale, use or
 * other dealings in products derived from or relating to the Covered Code
 * without prior written authorization from Intel.
 *
 * 4. Disclaimer and Export Compliance
 *
 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
 * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
 * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
 * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
 * PARTICULAR PURPOSE.
 *
 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
 * LIMITED REMEDY.
 *
 * 4.3. Licensee shall not export, either directly or indirectly, any of this
 * software or system incorporating such software without first obtaining any
 * required license or other approval from the U. S. Department of Commerce or
 * any other agency or department of the United States Government.  In the
 * event Licensee exports any such software from the United States or
 * re-exports any such software from a foreign destination, Licensee shall
 * ensure that the distribution and export/re-export of the software is in
 * compliance with all laws, regulations, orders, or other restrictions of the
 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 * any of its subsidiaries will export/re-export any technical data, process,
 * software, or service, directly or indirectly, to any country for which the
 * United States government or any agency thereof requires an export license,
 * other governmental approval, or letter of assurance, without first obtaining
 * such license, approval or letter.
 *
 *****************************************************************************/


#define __TBINSTAL_C__

#include "acpi.h"
#include "achware.h"
#include "actables.h"


#define _COMPONENT          ACPI_TABLES
        MODULE_NAME         ("tbinstal")


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbInstallTable
 *
 * PARAMETERS:  TablePtr            - Input buffer pointer, optional
 *              TableInfo           - Return value from AcpiTbGetTable
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load and validate all tables other than the RSDT.  The RSDT must
 *              already be loaded and validated.
 *              Install the table into the global data structs.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiTbInstallTable (
    ACPI_TABLE_HEADER       *TablePtr,
    ACPI_TABLE_DESC         *TableInfo)
{
    ACPI_STATUS             Status;

    FUNCTION_TRACE ("TbInstallTable");


    /*
     * Check the table signature and make sure it is recognized
     * Also checks the header checksum
     */

    Status = AcpiTbRecognizeTable (TablePtr, TableInfo);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Lock tables while installing */

    AcpiUtAcquireMutex (ACPI_MTX_TABLES);

    /* Install the table into the global data structure */

    Status = AcpiTbInitTableDescriptor (TableInfo->Type, TableInfo);

    DEBUG_PRINTP (ACPI_INFO, ("%s located at %p\n",
        AcpiGbl_AcpiTableData[TableInfo->Type].Name, TableInfo->Pointer));

    AcpiUtReleaseMutex (ACPI_MTX_TABLES);
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbRecognizeTable
 *
 * PARAMETERS:  TablePtr            - Input buffer pointer, optional
 *              TableInfo           - Return value from AcpiTbGetTable
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check a table signature for a match against known table types
 *
 * NOTE:  All table pointers are validated as follows:
 *          1) Table pointer must point to valid physical memory
 *          2) Signature must be 4 ASCII chars, even if we don't recognize the
 *             name
 *          3) Table must be readable for length specified in the header
 *          4) Table checksum must be valid (with the exception of the FACS
 *             which has no checksum for some odd reason)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiTbRecognizeTable (
    ACPI_TABLE_HEADER       *TablePtr,
    ACPI_TABLE_DESC         *TableInfo)
{
    ACPI_TABLE_HEADER       *TableHeader;
    ACPI_STATUS             Status;
    ACPI_TABLE_TYPE         TableType = 0;
    UINT32                  i;


    FUNCTION_TRACE ("TbRecognizeTable");


    /* Ensure that we have a valid table pointer */

    TableHeader = (ACPI_TABLE_HEADER *) TableInfo->Pointer;
    if (!TableHeader)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /*
     * Search for a signature match among the known table types
     * Start at index one -> Skip the RSDP
     */

    Status = AE_SUPPORT;
    for (i = 1; i < NUM_ACPI_TABLES; i++)
    {
        if (!STRNCMP (TableHeader->Signature,
                        AcpiGbl_AcpiTableData[i].Signature,
                        AcpiGbl_AcpiTableData[i].SigLength))
        {
            /*
             * Found a signature match, get the pertinent info from the
             * TableData structure
             */

            TableType       = i;
            Status          = AcpiGbl_AcpiTableData[i].Status;

            DEBUG_PRINTP (ACPI_INFO, ("Found %4.4s\n",
                AcpiGbl_AcpiTableData[i].Signature));
            break;
        }
    }

    /* Return the table type and length via the info struct */

    TableInfo->Type     = (UINT8) TableType;
    TableInfo->Length   = TableHeader->Length;


    /*
     * Validate checksum for _most_ tables,
     * even the ones whose signature we don't recognize
     */

    if (TableType != ACPI_TABLE_FACS)
    {
        /* But don't abort if the checksum is wrong */
        /* TBD: [Future] make this a configuration option? */

        AcpiTbVerifyTableChecksum (TableHeader);
    }

    /*
     * An AE_SUPPORT means that the table was not recognized.
     * We basically ignore this;  just print a debug message
     */

    if (Status == AE_SUPPORT)
    {
        DEBUG_PRINTP (ACPI_INFO,
            ("Unsupported table %s (Type %X) was found and discarded\n",
            AcpiGbl_AcpiTableData[TableType].Name, TableType));
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbInitTableDescriptor
 *
 * PARAMETERS:  TableType           - The type of the table
 *              TableInfo           - A table info struct
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Install a table into the global data structs.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiTbInitTableDescriptor (
    ACPI_TABLE_TYPE         TableType,
    ACPI_TABLE_DESC         *TableInfo)
{
    ACPI_TABLE_DESC         *ListHead;
    ACPI_TABLE_DESC         *TableDesc;


    FUNCTION_TRACE_U32 ("TbInitTableDescriptor", TableType);

    /*
     * Install the table into the global data structure
     */

    ListHead    = &AcpiGbl_AcpiTables[TableType];
    TableDesc   = ListHead;


    /*
     * Two major types of tables:  1) Only one instance is allowed.  This
     * includes most ACPI tables such as the DSDT.  2) Multiple instances of
     * the table are allowed.  This includes SSDT and PSDTs.
     */

    if (IS_SINGLE_TABLE (AcpiGbl_AcpiTableData[TableType].Flags))
    {
        /*
         * Only one table allowed, and a table has alread been installed
         *  at this location, so return an error.
         */

        if (ListHead->Pointer)
        {
            return_ACPI_STATUS (AE_EXIST);
        }

        TableDesc->Count = 1;
    }


    else
    {
        /*
         * Multiple tables allowed for this table type, we must link
         * the new table in to the list of tables of this type.
         */

        if (ListHead->Pointer)
        {
            TableDesc = AcpiUtCallocate (sizeof (ACPI_TABLE_DESC));
            if (!TableDesc)
            {
                return_ACPI_STATUS (AE_NO_MEMORY);
            }

            ListHead->Count++;

            /* Update the original previous */

            ListHead->Prev->Next = TableDesc;

            /* Update new entry */

            TableDesc->Prev = ListHead->Prev;
            TableDesc->Next = ListHead;

            /* Update list head */

            ListHead->Prev = TableDesc;
        }

        else
        {
            TableDesc->Count = 1;
        }
    }


    /* Common initialization of the table descriptor */

    TableDesc->Pointer              = TableInfo->Pointer;
    TableDesc->BasePointer          = TableInfo->BasePointer;
    TableDesc->Length               = TableInfo->Length;
    TableDesc->Allocation           = TableInfo->Allocation;
    TableDesc->AmlPointer           = (UINT8 *) (TableDesc->Pointer + 1),
    TableDesc->AmlLength            = (UINT32) (TableDesc->Length -
                                        (UINT32) sizeof (ACPI_TABLE_HEADER));
    TableDesc->TableId              = AcpiUtAllocateOwnerId (OWNER_TYPE_TABLE);
    TableDesc->LoadedIntoNamespace  = FALSE;

    /*
     * Set the appropriate global pointer (if there is one) to point to the
     * newly installed table
     */

    if (AcpiGbl_AcpiTableData[TableType].GlobalPtr)
    {
        *(AcpiGbl_AcpiTableData[TableType].GlobalPtr) = TableInfo->Pointer;
    }


    /* Return Data */

    TableInfo->TableId          = TableDesc->TableId;
    TableInfo->InstalledDesc    = TableDesc;

    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbDeleteAcpiTables
 *
 * PARAMETERS:  None.
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Delete all internal ACPI tables
 *
 ******************************************************************************/

void
AcpiTbDeleteAcpiTables (void)
{
    ACPI_TABLE_TYPE             Type;


    /*
     * Free memory allocated for ACPI tables
     * Memory can either be mapped or allocated
     */

    for (Type = 0; Type < NUM_ACPI_TABLES; Type++)
    {
        AcpiTbDeleteAcpiTable (Type);
    }

}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbDeleteAcpiTable
 *
 * PARAMETERS:  Type                - The table type to be deleted
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Delete an internal ACPI table
 *              Locks the ACPI table mutex
 *
 ******************************************************************************/

void
AcpiTbDeleteAcpiTable (
    ACPI_TABLE_TYPE             Type)
{
    FUNCTION_TRACE_U32 ("TbDeleteAcpiTable", Type);


    if (Type > ACPI_TABLE_MAX)
    {
        return_VOID;
    }


    AcpiUtAcquireMutex (ACPI_MTX_TABLES);

    /* Free the table */

    AcpiTbFreeAcpiTablesOfType (&AcpiGbl_AcpiTables[Type]);


    /* Clear the appropriate "typed" global table pointer */

    switch (Type)
    {
    case ACPI_TABLE_RSDP:
        AcpiGbl_RSDP = NULL;
        break;

    case ACPI_TABLE_DSDT:
        AcpiGbl_DSDT = NULL;
        break;

    case ACPI_TABLE_FADT:
        AcpiGbl_FADT = NULL;
        break;

    case ACPI_TABLE_FACS:
        AcpiGbl_FACS = NULL;
        break;

    case ACPI_TABLE_XSDT:
        AcpiGbl_XSDT = NULL;
        break;

    case ACPI_TABLE_SSDT:
    case ACPI_TABLE_PSDT:
    default:
        break;
    }

    AcpiUtReleaseMutex (ACPI_MTX_TABLES);

    return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbFreeAcpiTablesOfType
 *
 * PARAMETERS:  TableInfo           - A table info struct
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Free the memory associated with an internal ACPI table
 *              Table mutex should be locked.
 *
 ******************************************************************************/

void
AcpiTbFreeAcpiTablesOfType (
    ACPI_TABLE_DESC         *ListHead)
{
    ACPI_TABLE_DESC         *TableDesc;
    UINT32                  Count;
    UINT32                  i;


    FUNCTION_TRACE_PTR ("TbFreeAcpiTablesOfType", ListHead);


    /* Get the head of the list */

    TableDesc   = ListHead;
    Count       = ListHead->Count;

    /*
     * Walk the entire list, deleting both the allocated tables
     * and the table descriptors
     */

    for (i = 0; i < Count; i++)
    {
        TableDesc = AcpiTbUninstallTable (TableDesc);
    }

    return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbDeleteSingleTable
 *
 * PARAMETERS:  TableInfo           - A table info struct
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Low-level free for a single ACPI table.  Handles cases where
 *              the table was allocated a buffer or was mapped.
 *
 ******************************************************************************/

void
AcpiTbDeleteSingleTable (
    ACPI_TABLE_DESC         *TableDesc)
{

    if (!TableDesc)
    {
        return;
    }

    if (TableDesc->Pointer)
    {
        /* Valid table, determine type of memory allocation */

        switch (TableDesc->Allocation)
        {

        case ACPI_MEM_NOT_ALLOCATED:
            break;


        case ACPI_MEM_ALLOCATED:

            AcpiUtFree (TableDesc->BasePointer);
            break;


        case ACPI_MEM_MAPPED:

            AcpiOsUnmapMemory (TableDesc->BasePointer, TableDesc->Length);
            break;
        }
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbUninstallTable
 *
 * PARAMETERS:  TableInfo           - A table info struct
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Free the memory associated with an internal ACPI table that
 *              is either installed or has never been installed.
 *              Table mutex should be locked.
 *
 ******************************************************************************/

ACPI_TABLE_DESC *
AcpiTbUninstallTable (
    ACPI_TABLE_DESC         *TableDesc)
{
    ACPI_TABLE_DESC         *NextDesc;


    FUNCTION_TRACE_PTR ("TbDeleteSingleTable", TableDesc);


    if (!TableDesc)
    {
        return_PTR (NULL);
    }


    /* Unlink the descriptor */

    if (TableDesc->Prev)
    {
        TableDesc->Prev->Next = TableDesc->Next;
    }

    if (TableDesc->Next)
    {
        TableDesc->Next->Prev = TableDesc->Prev;
    }


    /* Free the memory allocated for the table itself */

    AcpiTbDeleteSingleTable (TableDesc);


    /* Free the table descriptor (Don't delete the list head, tho) */

    if ((TableDesc->Prev) == (TableDesc->Next))
    {

        NextDesc = NULL;

        /* Clear the list head */

        TableDesc->Pointer   = NULL;
        TableDesc->Length    = 0;
        TableDesc->Count     = 0;

    }

    else
    {
        /* Free the table descriptor */

        NextDesc = TableDesc->Next;
        AcpiUtFree (TableDesc);
    }


    return_PTR (NextDesc);
}