// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: tbdata - Table manager data structure functions
 *
 * Copyright (C) 2000 - 2021, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "actables.h"
#include "acevents.h"

#define _COMPONENT          ACPI_TABLES
ACPI_MODULE_NAME("tbdata")

/* Local prototypes */
static acpi_status
acpi_tb_check_duplication(struct acpi_table_desc *table_desc, u32 *table_index);

static u8
acpi_tb_compare_tables(struct acpi_table_desc *table_desc, u32 table_index);

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_compare_tables
 *
 * PARAMETERS:  table_desc          - Table 1 descriptor to be compared
 *              table_index         - Index of table 2 to be compared
 *
 * RETURN:      TRUE if both tables are identical.
 *
 * DESCRIPTION: This function compares a table with another table that has
 *              already been installed in the root table list.
 *
 ******************************************************************************/

static u8
acpi_tb_compare_tables(struct acpi_table_desc *table_desc, u32 table_index)
{
        acpi_status status = AE_OK;
        u8 is_identical;
        struct acpi_table_header *table;
        u32 table_length;
        u8 table_flags;

        status =
            acpi_tb_acquire_table(&acpi_gbl_root_table_list.tables[table_index],
                                  &table, &table_length, &table_flags);
        if (ACPI_FAILURE(status)) {
                return (FALSE);
        }

        /*
         * Check for a table match on the entire table length,
         * not just the header.
         */
        is_identical = (u8)((table_desc->length != table_length ||
                             memcmp(table_desc->pointer, table, table_length)) ?
                            FALSE : TRUE);

        /* Release the acquired table */

        acpi_tb_release_table(table, table_length, table_flags);
        return (is_identical);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_init_table_descriptor
 *
 * PARAMETERS:  table_desc              - Table descriptor
 *              address                 - Physical address of the table
 *              flags                   - Allocation flags of the table
 *              table                   - Pointer to the table
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialize a new table descriptor
 *
 ******************************************************************************/

void
acpi_tb_init_table_descriptor(struct acpi_table_desc *table_desc,
                              acpi_physical_address address,
                              u8 flags, struct acpi_table_header *table)
{

        /*
         * Initialize the table descriptor. Set the pointer to NULL, since the
         * table is not fully mapped at this time.
         */
        memset(table_desc, 0, sizeof(struct acpi_table_desc));
        table_desc->address = address;
        table_desc->length = table->length;
        table_desc->flags = flags;
        ACPI_MOVE_32_TO_32(table_desc->signature.ascii, table->signature);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_acquire_table
 *
 * PARAMETERS:  table_desc          - Table descriptor
 *              table_ptr           - Where table is returned
 *              table_length        - Where table length is returned
 *              table_flags         - Where table allocation flags are returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Acquire an ACPI table. It can be used for tables not
 *              maintained in the acpi_gbl_root_table_list.
 *
 ******************************************************************************/

acpi_status
acpi_tb_acquire_table(struct acpi_table_desc *table_desc,
                      struct acpi_table_header **table_ptr,
                      u32 *table_length, u8 *table_flags)
{
        struct acpi_table_header *table = NULL;

        switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
        case ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL:

                table =
                    acpi_os_map_memory(table_desc->address, table_desc->length);
                break;

        case ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL:
        case ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL:

                table = ACPI_CAST_PTR(struct acpi_table_header,
                                      ACPI_PHYSADDR_TO_PTR(table_desc->
                                                           address));
                break;

        default:

                break;
        }

        /* Table is not valid yet */

        if (!table) {
                return (AE_NO_MEMORY);
        }

        /* Fill the return values */

        *table_ptr = table;
        *table_length = table_desc->length;
        *table_flags = table_desc->flags;
        return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_release_table
 *
 * PARAMETERS:  table               - Pointer for the table
 *              table_length        - Length for the table
 *              table_flags         - Allocation flags for the table
 *
 * RETURN:      None
 *
 * DESCRIPTION: Release a table. The inverse of acpi_tb_acquire_table().
 *
 ******************************************************************************/

void
acpi_tb_release_table(struct acpi_table_header *table,
                      u32 table_length, u8 table_flags)
{

        switch (table_flags & ACPI_TABLE_ORIGIN_MASK) {
        case ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL:

                acpi_os_unmap_memory(table, table_length);
                break;

        case ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL:
        case ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL:
        default:

                break;
        }
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_acquire_temp_table
 *
 * PARAMETERS:  table_desc          - Table descriptor to be acquired
 *              address             - Address of the table
 *              flags               - Allocation flags of the table
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function validates the table header to obtain the length
 *              of a table and fills the table descriptor to make its state as
 *              "INSTALLED". Such a table descriptor is only used for verified
 *              installation.
 *
 ******************************************************************************/

acpi_status
acpi_tb_acquire_temp_table(struct acpi_table_desc *table_desc,
                           acpi_physical_address address, u8 flags)
{
        struct acpi_table_header *table_header;

        switch (flags & ACPI_TABLE_ORIGIN_MASK) {
        case ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL:

                /* Get the length of the full table from the header */

                table_header =
                    acpi_os_map_memory(address,
                                       sizeof(struct acpi_table_header));
                if (!table_header) {
                        return (AE_NO_MEMORY);
                }

                acpi_tb_init_table_descriptor(table_desc, address, flags,
                                              table_header);
                acpi_os_unmap_memory(table_header,
                                     sizeof(struct acpi_table_header));
                return (AE_OK);

        case ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL:
        case ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL:

                table_header = ACPI_CAST_PTR(struct acpi_table_header,
                                             ACPI_PHYSADDR_TO_PTR(address));
                if (!table_header) {
                        return (AE_NO_MEMORY);
                }

                acpi_tb_init_table_descriptor(table_desc, address, flags,
                                              table_header);
                return (AE_OK);

        default:

                break;
        }

        /* Table is not valid yet */

        return (AE_NO_MEMORY);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_release_temp_table
 *
 * PARAMETERS:  table_desc          - Table descriptor to be released
 *
 * RETURN:      Status
 *
 * DESCRIPTION: The inverse of acpi_tb_acquire_temp_table().
 *
 *****************************************************************************/

void acpi_tb_release_temp_table(struct acpi_table_desc *table_desc)
{

        /*
         * Note that the .Address is maintained by the callers of
         * acpi_tb_acquire_temp_table(), thus do not invoke acpi_tb_uninstall_table()
         * where .Address will be freed.
         */
        acpi_tb_invalidate_table(table_desc);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_tb_validate_table
 *
 * PARAMETERS:  table_desc          - Table descriptor
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to validate the table, the returned
 *              table descriptor is in "VALIDATED" state.
 *
 *****************************************************************************/

acpi_status acpi_tb_validate_table(struct acpi_table_desc *table_desc)
{
        acpi_status status = AE_OK;

        ACPI_FUNCTION_TRACE(tb_validate_table);

        /* Validate the table if necessary */

        if (!table_desc->pointer) {
                status = acpi_tb_acquire_table(table_desc, &table_desc->pointer,
                                               &table_desc->length,
                                               &table_desc->flags);
                if (!table_desc->pointer) {
                        status = AE_NO_MEMORY;
                }
        }

        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_invalidate_table
 *
 * PARAMETERS:  table_desc          - Table descriptor
 *
 * RETURN:      None
 *
 * DESCRIPTION: Invalidate one internal ACPI table, this is the inverse of
 *              acpi_tb_validate_table().
 *
 ******************************************************************************/

void acpi_tb_invalidate_table(struct acpi_table_desc *table_desc)
{

        ACPI_FUNCTION_TRACE(tb_invalidate_table);

        /* Table must be validated */

        if (!table_desc->pointer) {
                return_VOID;
        }

        acpi_tb_release_table(table_desc->pointer, table_desc->length,
                              table_desc->flags);
        table_desc->pointer = NULL;

        return_VOID;
}

/******************************************************************************
 *
 * FUNCTION:    acpi_tb_validate_temp_table
 *
 * PARAMETERS:  table_desc          - Table descriptor
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to validate the table, the returned
 *              table descriptor is in "VALIDATED" state.
 *
 *****************************************************************************/

acpi_status acpi_tb_validate_temp_table(struct acpi_table_desc *table_desc)
{

        if (!table_desc->pointer && !acpi_gbl_enable_table_validation) {
                /*
                 * Only validates the header of the table.
                 * Note that Length contains the size of the mapping after invoking
                 * this work around, this value is required by
                 * acpi_tb_release_temp_table().
                 * We can do this because in acpi_init_table_descriptor(), the Length
                 * field of the installed descriptor is filled with the actual
                 * table length obtaining from the table header.
                 */
                table_desc->length = sizeof(struct acpi_table_header);
        }

        return (acpi_tb_validate_table(table_desc));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_check_duplication
 *
 * PARAMETERS:  table_desc          - Table descriptor
 *              table_index         - Where the table index is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Avoid installing duplicated tables. However table override and
 *              user aided dynamic table load is allowed, thus comparing the
 *              address of the table is not sufficient, and checking the entire
 *              table content is required.
 *
 ******************************************************************************/

static acpi_status
acpi_tb_check_duplication(struct acpi_table_desc *table_desc, u32 *table_index)
{
        u32 i;

        ACPI_FUNCTION_TRACE(tb_check_duplication);

        /* Check if table is already registered */

        for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {

                /* Do not compare with unverified tables */

                if (!
                    (acpi_gbl_root_table_list.tables[i].
                     flags & ACPI_TABLE_IS_VERIFIED)) {
                        continue;
                }

                /*
                 * Check for a table match on the entire table length,
                 * not just the header.
                 */
                if (!acpi_tb_compare_tables(table_desc, i)) {
                        continue;
                }

                /*
                 * Note: the current mechanism does not unregister a table if it is
                 * dynamically unloaded. The related namespace entries are deleted,
                 * but the table remains in the root table list.
                 *
                 * The assumption here is that the number of different tables that
                 * will be loaded is actually small, and there is minimal overhead
                 * in just keeping the table in case it is needed again.
                 *
                 * If this assumption changes in the future (perhaps on large
                 * machines with many table load/unload operations), tables will
                 * need to be unregistered when they are unloaded, and slots in the
                 * root table list should be reused when empty.
                 */
                if (acpi_gbl_root_table_list.tables[i].flags &
                    ACPI_TABLE_IS_LOADED) {

                        /* Table is still loaded, this is an error */

                        return_ACPI_STATUS(AE_ALREADY_EXISTS);
                } else {
                        *table_index = i;
                        return_ACPI_STATUS(AE_CTRL_TERMINATE);
                }
        }

        /* Indicate no duplication to the caller */

        return_ACPI_STATUS(AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_tb_verify_temp_table
 *
 * PARAMETERS:  table_desc          - Table descriptor
 *              signature           - Table signature to verify
 *              table_index         - Where the table index is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to validate and verify the table, the
 *              returned table descriptor is in "VALIDATED" state.
 *              Note that 'TableIndex' is required to be set to !NULL to
 *              enable duplication check.
 *
 *****************************************************************************/

acpi_status
acpi_tb_verify_temp_table(struct acpi_table_desc *table_desc,
                          char *signature, u32 *table_index)
{
        acpi_status status = AE_OK;

        ACPI_FUNCTION_TRACE(tb_verify_temp_table);

        /* Validate the table */

        status = acpi_tb_validate_temp_table(table_desc);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(AE_NO_MEMORY);
        }

        /* If a particular signature is expected (DSDT/FACS), it must match */

        if (signature &&
            !ACPI_COMPARE_NAMESEG(&table_desc->signature, signature)) {
                ACPI_BIOS_ERROR((AE_INFO,
                                 "Invalid signature 0x%X for ACPI table, expected [%s]",
                                 table_desc->signature.integer, signature));
                status = AE_BAD_SIGNATURE;
                goto invalidate_and_exit;
        }

        if (acpi_gbl_enable_table_validation) {

                /* Verify the checksum */

                status =
                    acpi_tb_verify_checksum(table_desc->pointer,
                                            table_desc->length);
                if (ACPI_FAILURE(status)) {
                        ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY,
                                        "%4.4s 0x%8.8X%8.8X"
                                        " Attempted table install failed",
                                        acpi_ut_valid_nameseg(table_desc->
                                                              signature.
                                                              ascii) ?
                                        table_desc->signature.ascii : "????",
                                        ACPI_FORMAT_UINT64(table_desc->
                                                           address)));

                        goto invalidate_and_exit;
                }

                /* Avoid duplications */

                if (table_index) {
                        status =
                            acpi_tb_check_duplication(table_desc, table_index);
                        if (ACPI_FAILURE(status)) {
                                if (status != AE_CTRL_TERMINATE) {
                                        ACPI_EXCEPTION((AE_INFO, status,
                                                        "%4.4s 0x%8.8X%8.8X"
                                                        " Table is already loaded",
                                                        acpi_ut_valid_nameseg
                                                        (table_desc->signature.
                                                         ascii) ? table_desc->
                                                        signature.
                                                        ascii : "????",
                                                        ACPI_FORMAT_UINT64
                                                        (table_desc->address)));
                                }

                                goto invalidate_and_exit;
                        }
                }

                table_desc->flags |= ACPI_TABLE_IS_VERIFIED;
        }

        return_ACPI_STATUS(status);

invalidate_and_exit:
        acpi_tb_invalidate_table(table_desc);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_resize_root_table_list
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Expand the size of global table array
 *
 ******************************************************************************/

acpi_status acpi_tb_resize_root_table_list(void)
{
        struct acpi_table_desc *tables;
        u32 table_count;
        u32 current_table_count, max_table_count;
        u32 i;

        ACPI_FUNCTION_TRACE(tb_resize_root_table_list);

        /* allow_resize flag is a parameter to acpi_initialize_tables */

        if (!(acpi_gbl_root_table_list.flags & ACPI_ROOT_ALLOW_RESIZE)) {
                ACPI_ERROR((AE_INFO,
                            "Resize of Root Table Array is not allowed"));
                return_ACPI_STATUS(AE_SUPPORT);
        }

        /* Increase the Table Array size */

        if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
                table_count = acpi_gbl_root_table_list.max_table_count;
        } else {
                table_count = acpi_gbl_root_table_list.current_table_count;
        }

        max_table_count = table_count + ACPI_ROOT_TABLE_SIZE_INCREMENT;
        tables = ACPI_ALLOCATE_ZEROED(((acpi_size)max_table_count) *
                                      sizeof(struct acpi_table_desc));
        if (!tables) {
                ACPI_ERROR((AE_INFO,
                            "Could not allocate new root table array"));
                return_ACPI_STATUS(AE_NO_MEMORY);
        }

        /* Copy and free the previous table array */

        current_table_count = 0;
        if (acpi_gbl_root_table_list.tables) {
                for (i = 0; i < table_count; i++) {
                        if (acpi_gbl_root_table_list.tables[i].address) {
                                memcpy(tables + current_table_count,
                                       acpi_gbl_root_table_list.tables + i,
                                       sizeof(struct acpi_table_desc));
                                current_table_count++;
                        }
                }

                if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
                        ACPI_FREE(acpi_gbl_root_table_list.tables);
                }
        }

        acpi_gbl_root_table_list.tables = tables;
        acpi_gbl_root_table_list.max_table_count = max_table_count;
        acpi_gbl_root_table_list.current_table_count = current_table_count;
        acpi_gbl_root_table_list.flags |= ACPI_ROOT_ORIGIN_ALLOCATED;

        return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_next_table_descriptor
 *
 * PARAMETERS:  table_index         - Where table index is returned
 *              table_desc          - Where table descriptor is returned
 *
 * RETURN:      Status and table index/descriptor.
 *
 * DESCRIPTION: Allocate a new ACPI table entry to the global table list
 *
 ******************************************************************************/

acpi_status
acpi_tb_get_next_table_descriptor(u32 *table_index,
                                  struct acpi_table_desc **table_desc)
{
        acpi_status status;
        u32 i;

        /* Ensure that there is room for the table in the Root Table List */

        if (acpi_gbl_root_table_list.current_table_count >=
            acpi_gbl_root_table_list.max_table_count) {
                status = acpi_tb_resize_root_table_list();
                if (ACPI_FAILURE(status)) {
                        return (status);
                }
        }

        i = acpi_gbl_root_table_list.current_table_count;
        acpi_gbl_root_table_list.current_table_count++;

        if (table_index) {
                *table_index = i;
        }
        if (table_desc) {
                *table_desc = &acpi_gbl_root_table_list.tables[i];
        }

        return (AE_OK);
}

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

void acpi_tb_terminate(void)
{
        u32 i;

        ACPI_FUNCTION_TRACE(tb_terminate);

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);

        /* Delete the individual tables */

        for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
                acpi_tb_uninstall_table(&acpi_gbl_root_table_list.tables[i]);
        }

        /*
         * Delete the root table array if allocated locally. Array cannot be
         * mapped, so we don't need to check for that flag.
         */
        if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
                ACPI_FREE(acpi_gbl_root_table_list.tables);
        }

        acpi_gbl_root_table_list.tables = NULL;
        acpi_gbl_root_table_list.flags = 0;
        acpi_gbl_root_table_list.current_table_count = 0;

        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));

        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
        return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_delete_namespace_by_owner
 *
 * PARAMETERS:  table_index         - Table index
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Delete all namespace objects created when this table was loaded.
 *
 ******************************************************************************/

acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
{
        acpi_owner_id owner_id;
        acpi_status status;

        ACPI_FUNCTION_TRACE(tb_delete_namespace_by_owner);

        status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        if (table_index >= acpi_gbl_root_table_list.current_table_count) {

                /* The table index does not exist */

                (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
                return_ACPI_STATUS(AE_NOT_EXIST);
        }

        /* Get the owner ID for this table, used to delete namespace nodes */

        owner_id = acpi_gbl_root_table_list.tables[table_index].owner_id;
        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);

        /*
         * Need to acquire the namespace writer lock to prevent interference
         * with any concurrent namespace walks. The interpreter must be
         * released during the deletion since the acquisition of the deletion
         * lock may block, and also since the execution of a namespace walk
         * must be allowed to use the interpreter.
         */
        status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        acpi_ns_delete_namespace_by_owner(owner_id);
        acpi_ut_release_write_lock(&acpi_gbl_namespace_rw_lock);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_allocate_owner_id
 *
 * PARAMETERS:  table_index         - Table index
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Allocates owner_id in table_desc
 *
 ******************************************************************************/

acpi_status acpi_tb_allocate_owner_id(u32 table_index)
{
        acpi_status status = AE_BAD_PARAMETER;

        ACPI_FUNCTION_TRACE(tb_allocate_owner_id);

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (table_index < acpi_gbl_root_table_list.current_table_count) {
                status =
                    acpi_ut_allocate_owner_id(&
                                              (acpi_gbl_root_table_list.
                                               tables[table_index].owner_id));
        }

        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_release_owner_id
 *
 * PARAMETERS:  table_index         - Table index
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Releases owner_id in table_desc
 *
 ******************************************************************************/

acpi_status acpi_tb_release_owner_id(u32 table_index)
{
        acpi_status status = AE_BAD_PARAMETER;

        ACPI_FUNCTION_TRACE(tb_release_owner_id);

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (table_index < acpi_gbl_root_table_list.current_table_count) {
                acpi_ut_release_owner_id(&
                                         (acpi_gbl_root_table_list.
                                          tables[table_index].owner_id));
                status = AE_OK;
        }

        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_owner_id
 *
 * PARAMETERS:  table_index         - Table index
 *              owner_id            - Where the table owner_id is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: returns owner_id for the ACPI table
 *
 ******************************************************************************/

acpi_status acpi_tb_get_owner_id(u32 table_index, acpi_owner_id *owner_id)
{
        acpi_status status = AE_BAD_PARAMETER;

        ACPI_FUNCTION_TRACE(tb_get_owner_id);

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (table_index < acpi_gbl_root_table_list.current_table_count) {
                *owner_id =
                    acpi_gbl_root_table_list.tables[table_index].owner_id;
                status = AE_OK;
        }

        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_is_table_loaded
 *
 * PARAMETERS:  table_index         - Index into the root table
 *
 * RETURN:      Table Loaded Flag
 *
 ******************************************************************************/

u8 acpi_tb_is_table_loaded(u32 table_index)
{
        u8 is_loaded = FALSE;

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (table_index < acpi_gbl_root_table_list.current_table_count) {
                is_loaded = (u8)
                    (acpi_gbl_root_table_list.tables[table_index].flags &
                     ACPI_TABLE_IS_LOADED);
        }

        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
        return (is_loaded);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_set_table_loaded_flag
 *
 * PARAMETERS:  table_index         - Table index
 *              is_loaded           - TRUE if table is loaded, FALSE otherwise
 *
 * RETURN:      None
 *
 * DESCRIPTION: Sets the table loaded flag to either TRUE or FALSE.
 *
 ******************************************************************************/

void acpi_tb_set_table_loaded_flag(u32 table_index, u8 is_loaded)
{

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (table_index < acpi_gbl_root_table_list.current_table_count) {
                if (is_loaded) {
                        acpi_gbl_root_table_list.tables[table_index].flags |=
                            ACPI_TABLE_IS_LOADED;
                } else {
                        acpi_gbl_root_table_list.tables[table_index].flags &=
                            ~ACPI_TABLE_IS_LOADED;
                }
        }

        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_load_table
 *
 * PARAMETERS:  table_index             - Table index
 *              parent_node             - Where table index is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load an ACPI table
 *
 ******************************************************************************/

acpi_status
acpi_tb_load_table(u32 table_index, struct acpi_namespace_node *parent_node)
{
        struct acpi_table_header *table;
        acpi_status status;
        acpi_owner_id owner_id;

        ACPI_FUNCTION_TRACE(tb_load_table);

        /*
         * Note: Now table is "INSTALLED", it must be validated before
         * using.
         */
        status = acpi_get_table_by_index(table_index, &table);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        status = acpi_ns_load_table(table_index, parent_node);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        /*
         * Update GPEs for any new _Lxx/_Exx methods. Ignore errors. The host is
         * responsible for discovering any new wake GPEs by running _PRW methods
         * that may have been loaded by this table.
         */
        status = acpi_tb_get_owner_id(table_index, &owner_id);
        if (ACPI_SUCCESS(status)) {
                acpi_ev_update_gpes(owner_id);
        }

        /* Invoke table handler */

        acpi_tb_notify_table(ACPI_TABLE_EVENT_LOAD, table);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_install_and_load_table
 *
 * PARAMETERS:  address                 - Physical address of the table
 *              flags                   - Allocation flags of the table
 *              override                - Whether override should be performed
 *              table_index             - Where table index is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install and load an ACPI table
 *
 ******************************************************************************/

acpi_status
acpi_tb_install_and_load_table(acpi_physical_address address,
                               u8 flags, u8 override, u32 *table_index)
{
        acpi_status status;
        u32 i;

        ACPI_FUNCTION_TRACE(tb_install_and_load_table);

        /* Install the table and load it into the namespace */

        status = acpi_tb_install_standard_table(address, flags, TRUE,
                                                override, &i);
        if (ACPI_FAILURE(status)) {
                goto exit;
        }

        status = acpi_tb_load_table(i, acpi_gbl_root_node);

exit:
        *table_index = i;
        return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_tb_install_and_load_table)

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_unload_table
 *

 * PARAMETERS:  table_index             - Table index
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Unload an ACPI table
 *
 ******************************************************************************/

acpi_status acpi_tb_unload_table(u32 table_index)
{
        acpi_status status = AE_OK;
        struct acpi_table_header *table;

        ACPI_FUNCTION_TRACE(tb_unload_table);

        /* Ensure the table is still loaded */

        if (!acpi_tb_is_table_loaded(table_index)) {
                return_ACPI_STATUS(AE_NOT_EXIST);
        }

        /* Invoke table handler */

        status = acpi_get_table_by_index(table_index, &table);
        if (ACPI_SUCCESS(status)) {
                acpi_tb_notify_table(ACPI_TABLE_EVENT_UNLOAD, table);
        }

        /* Delete the portion of the namespace owned by this table */

        status = acpi_tb_delete_namespace_by_owner(table_index);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        (void)acpi_tb_release_owner_id(table_index);
        acpi_tb_set_table_loaded_flag(table_index, FALSE);
        return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_tb_unload_table)

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_notify_table
 *
 * PARAMETERS:  event               - Table event
 *              table               - Validated table pointer
 *
 * RETURN:      None
 *
 * DESCRIPTION: Notify a table event to the users.
 *
 ******************************************************************************/

void acpi_tb_notify_table(u32 event, void *table)
{
        /* Invoke table handler if present */

        if (acpi_gbl_table_handler) {
                (void)acpi_gbl_table_handler(event, table,
                                             acpi_gbl_table_handler_context);
        }
}