dist/tables/tbinstal.c

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

/*
 * Copyright (C) 2000 - 2021, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include "acpi.h"
#include "accommon.h"
#include "actables.h"

#define _COMPONENT          ACPI_TABLES
        ACPI_MODULE_NAME    ("tbinstal")


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbInstallTableWithOverride
 *
 * PARAMETERS:  NewTableDesc            - New table descriptor to install
 *              Override                - Whether override should be performed
 *              TableIndex              - Where the table index is returned
 *
 * RETURN:      None
 *
 * DESCRIPTION: Install an ACPI table into the global data structure. The
 *              table override mechanism is called to allow the host
 *              OS to replace any table before it is installed in the root
 *              table array.
 *
 ******************************************************************************/

void
AcpiTbInstallTableWithOverride (
    ACPI_TABLE_DESC         *NewTableDesc,
    BOOLEAN                 Override,
    UINT32                  *TableIndex)
{
    UINT32                  i;
    ACPI_STATUS             Status;


    Status = AcpiTbGetNextTableDescriptor (&i, NULL);
    if (ACPI_FAILURE (Status))
    {
        return;
    }

    /*
     * ACPI Table Override:
     *
     * Before we install the table, let the host OS override it with a new
     * one if desired. Any table within the RSDT/XSDT can be replaced,
     * including the DSDT which is pointed to by the FADT.
     */
    if (Override)
    {
        AcpiTbOverrideTable (NewTableDesc);
    }

    AcpiTbInitTableDescriptor (&AcpiGbl_RootTableList.Tables[i],
        NewTableDesc->Address, NewTableDesc->Flags, NewTableDesc->Pointer);

    AcpiTbPrintTableHeader (NewTableDesc->Address, NewTableDesc->Pointer);

    /* This synchronizes AcpiGbl_DsdtIndex */

    *TableIndex = i;

    /* Set the global integer width (based upon revision of the DSDT) */

    if (i == AcpiGbl_DsdtIndex)
    {
        AcpiUtSetIntegerWidth (NewTableDesc->Pointer->Revision);
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbInstallStandardTable
 *
 * PARAMETERS:  Address             - Address of the table (might be a virtual
 *                                    address depending on the TableFlags)
 *              Flags               - Flags for the table
 *              Table               - Pointer to the table (required for virtual
 *                                    origins, optional for physical)
 *              Reload              - Whether reload should be performed
 *              Override            - Whether override should be performed
 *              TableIndex          - Where the table index is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to verify and install an ACPI table.
 *              When this function is called by "Load" or "LoadTable" opcodes,
 *              or by AcpiLoadTable() API, the "Reload" parameter is set.
 *              After successfully returning from this function, table is
 *              "INSTALLED" but not "VALIDATED".
 *
 ******************************************************************************/

ACPI_STATUS
AcpiTbInstallStandardTable (
    ACPI_PHYSICAL_ADDRESS   Address,
    UINT8                   Flags,
    ACPI_TABLE_HEADER       *Table,
    BOOLEAN                 Reload,
    BOOLEAN                 Override,
    UINT32                  *TableIndex)
{
    UINT32                  i;
    ACPI_STATUS             Status = AE_OK;
    ACPI_TABLE_DESC         NewTableDesc;


    ACPI_FUNCTION_TRACE (TbInstallStandardTable);


    /* Acquire a temporary table descriptor for validation */

    Status = AcpiTbAcquireTempTable (&NewTableDesc, Address, Flags, Table);
    if (ACPI_FAILURE (Status))
    {
        ACPI_ERROR ((AE_INFO,
            "Could not acquire table length at %8.8X%8.8X",
            ACPI_FORMAT_UINT64 (Address)));
        return_ACPI_STATUS (Status);
    }

    /*
     * Optionally do not load any SSDTs from the RSDT/XSDT. This can
     * be useful for debugging ACPI problems on some machines.
     */
    if (!Reload &&
        AcpiGbl_DisableSsdtTableInstall &&
        ACPI_COMPARE_NAMESEG (&NewTableDesc.Signature, ACPI_SIG_SSDT))
    {
        ACPI_INFO ((
            "Ignoring installation of %4.4s at %8.8X%8.8X",
            NewTableDesc.Signature.Ascii, ACPI_FORMAT_UINT64 (Address)));
        goto ReleaseAndExit;
    }

    /* Acquire the table lock */

    (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);

    /* Validate and verify a table before installation */

    Status = AcpiTbVerifyTempTable (&NewTableDesc, NULL, &i);
    if (ACPI_FAILURE (Status))
    {
        if (Status == AE_CTRL_TERMINATE)
        {
            /*
             * Table was unloaded, allow it to be reloaded.
             * As we are going to return AE_OK to the caller, we should
             * take the responsibility of freeing the input descriptor.
             * Refill the input descriptor to ensure
             * AcpiTbInstallTableWithOverride() can be called again to
             * indicate the re-installation.
             */
            AcpiTbUninstallTable (&NewTableDesc);
            (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
            *TableIndex = i;
            return_ACPI_STATUS (AE_OK);
        }
        goto UnlockAndExit;
    }

    /* Add the table to the global root table list */

    AcpiTbInstallTableWithOverride (&NewTableDesc, Override, TableIndex);

    /* Invoke table handler */

    (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
    AcpiTbNotifyTable (ACPI_TABLE_EVENT_INSTALL, NewTableDesc.Pointer);
    (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);

UnlockAndExit:

    /* Release the table lock */

    (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);

ReleaseAndExit:

    /* Release the temporary table descriptor */

    AcpiTbReleaseTempTable (&NewTableDesc);
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbOverrideTable
 *
 * PARAMETERS:  OldTableDesc        - Validated table descriptor to be
 *                                    overridden
 *
 * RETURN:      None
 *
 * DESCRIPTION: Attempt table override by calling the OSL override functions.
 *              Note: If the table is overridden, then the entire new table
 *              is acquired and returned by this function.
 *              Before/after invocation, the table descriptor is in a state
 *              that is "VALIDATED".
 *
 ******************************************************************************/

void
AcpiTbOverrideTable (
    ACPI_TABLE_DESC         *OldTableDesc)
{
    ACPI_STATUS             Status;
    ACPI_TABLE_DESC         NewTableDesc;
    ACPI_TABLE_HEADER       *Table;
    ACPI_PHYSICAL_ADDRESS   Address;
    UINT32                  Length;
    ACPI_ERROR_ONLY (const char   *OverrideType);


    /* (1) Attempt logical override (returns a logical address) */

    Status = AcpiOsTableOverride (OldTableDesc->Pointer, &Table);
    if (ACPI_SUCCESS (Status) && Table)
    {
        AcpiTbAcquireTempTable (&NewTableDesc, ACPI_PTR_TO_PHYSADDR (Table),
            ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, Table);
        ACPI_ERROR_ONLY (OverrideType = "Logical");
        goto FinishOverride;
    }

    /* (2) Attempt physical override (returns a physical address) */

    Status = AcpiOsPhysicalTableOverride (OldTableDesc->Pointer,
        &Address, &Length);
    if (ACPI_SUCCESS (Status) && Address && Length)
    {
        AcpiTbAcquireTempTable (&NewTableDesc, Address,
            ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, NULL);
        ACPI_ERROR_ONLY (OverrideType = "Physical");
        goto FinishOverride;
    }

    return; /* There was no override */


FinishOverride:

    /*
     * Validate and verify a table before overriding, no nested table
     * duplication check as it's too complicated and unnecessary.
     */
    Status = AcpiTbVerifyTempTable (&NewTableDesc, NULL, NULL);
    if (ACPI_FAILURE (Status))
    {
        return;
    }

    ACPI_INFO (("%4.4s 0x%8.8X%8.8X"
        " %s table override, new table: 0x%8.8X%8.8X",
        OldTableDesc->Signature.Ascii,
        ACPI_FORMAT_UINT64 (OldTableDesc->Address),
        OverrideType, ACPI_FORMAT_UINT64 (NewTableDesc.Address)));

    /* We can now uninstall the original table */

    AcpiTbUninstallTable (OldTableDesc);

    /*
     * Replace the original table descriptor and keep its state as
     * "VALIDATED".
     */
    AcpiTbInitTableDescriptor (OldTableDesc, NewTableDesc.Address,
        NewTableDesc.Flags, NewTableDesc.Pointer);
    AcpiTbValidateTempTable (OldTableDesc);

    /* Release the temporary table descriptor */

    AcpiTbReleaseTempTable (&NewTableDesc);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbUninstallTable
 *
 * PARAMETERS:  TableDesc           - Table descriptor
 *
 * RETURN:      None
 *
 * DESCRIPTION: Delete one internal ACPI table
 *
 ******************************************************************************/

void
AcpiTbUninstallTable (
    ACPI_TABLE_DESC         *TableDesc)
{

    ACPI_FUNCTION_TRACE (TbUninstallTable);


    /* Table must be installed */

    if (!TableDesc->Address)
    {
        return_VOID;
    }

    AcpiTbInvalidateTable (TableDesc);

    if ((TableDesc->Flags & ACPI_TABLE_ORIGIN_MASK) ==
        ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL)
    {
        ACPI_FREE (TableDesc->Pointer);
        TableDesc->Pointer = NULL;
    }

    TableDesc->Address = ACPI_PTR_TO_PHYSADDR (NULL);
    return_VOID;
}