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/******************************************************************************

 *

 * Module Name: utxface - External interfaces for "global" ACPI functions

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2004, R. Byron Moore

 * 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 MERCHANTIBILITY 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/acpi.h>

#include <acpi/acevents.h>

#include <acpi/acnamesp.h>

#include <acpi/acparser.h>

#include <acpi/acdispat.h>

#include <acpi/acdebug.h>

#define _COMPONENT          ACPI_UTILITIES

         ACPI_MODULE_NAME    ("utxface")

/*******************************************************************************

 *

 * FUNCTION:    acpi_initialize_subsystem

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Initializes all global variables.  This is the first function

 *              called, so any early initialization belongs here.

 *

 ******************************************************************************/

acpi_status

acpi_initialize_subsystem (

        void)

{

        acpi_status                     status;

        ACPI_FUNCTION_TRACE ("acpi_initialize_subsystem");

        ACPI_DEBUG_EXEC (acpi_ut_init_stack_ptr_trace ());

        /* Initialize all globals used by the subsystem */

        acpi_ut_init_globals ();

        /* Initialize the OS-Dependent layer */

        status = acpi_os_initialize ();

        if (ACPI_FAILURE (status)) {

                ACPI_REPORT_ERROR (("OSD failed to initialize, %s\n",

                        acpi_format_exception (status)));

                return_ACPI_STATUS (status);

        }

        /* Create the default mutex objects */

        status = acpi_ut_mutex_initialize ();

        if (ACPI_FAILURE (status)) {

                ACPI_REPORT_ERROR (("Global mutex creation failure, %s\n",

                        acpi_format_exception (status)));

                return_ACPI_STATUS (status);

        }

        /*

         * Initialize the namespace manager and

         * the root of the namespace tree

         */

        status = acpi_ns_root_initialize ();

        if (ACPI_FAILURE (status)) {

                ACPI_REPORT_ERROR (("Namespace initialization failure, %s\n",

                        acpi_format_exception (status)));

                return_ACPI_STATUS (status);

        }

        /* If configured, initialize the AML debugger */

        ACPI_DEBUGGER_EXEC (status = acpi_db_initialize ());

        return_ACPI_STATUS (status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_enable_subsystem

 *

 * PARAMETERS:  Flags           - Init/enable Options

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Completes the subsystem initialization including hardware.

 *              Puts system into ACPI mode if it isn't already.

 *

 ******************************************************************************/

acpi_status

acpi_enable_subsystem (

        u32                             flags)

{

        acpi_status                     status = AE_OK;

        ACPI_FUNCTION_TRACE ("acpi_enable_subsystem");

        /*

         * We must initialize the hardware before we can enable ACPI.

         * The values from the FADT are validated here.

         */

        if (!(flags & ACPI_NO_HARDWARE_INIT)) {

                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI hardware\n"));

                status = acpi_hw_initialize ();

                if (ACPI_FAILURE (status)) {

                        return_ACPI_STATUS (status);

                }

        }

        /*

         * Enable ACPI mode

         */

        if (!(flags & ACPI_NO_ACPI_ENABLE)) {

                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Going into ACPI mode\n"));

                acpi_gbl_original_mode = acpi_hw_get_mode();

                status = acpi_enable ();

                if (ACPI_FAILURE (status)) {

                        ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "acpi_enable failed.\n"));

                        return_ACPI_STATUS (status);

                }

        }

        /*

         * Initialize ACPI Event handling

         *

         * NOTE: We must have the hardware AND events initialized before we can execute

         * ANY control methods SAFELY.  Any control method can require ACPI hardware

         * support, so the hardware MUST be initialized before execution!

         */

        if (!(flags & ACPI_NO_EVENT_INIT)) {

                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI events\n"));

                status = acpi_ev_initialize ();

                if (ACPI_FAILURE (status)) {

                        return_ACPI_STATUS (status);

                }

        }

        /* Install the SCI handler, Global Lock handler, and GPE handlers */

        if (!(flags & ACPI_NO_HANDLER_INIT)) {

                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Installing SCI/GL/GPE handlers\n"));

                status = acpi_ev_handler_initialize ();

                if (ACPI_FAILURE (status)) {

                        return_ACPI_STATUS (status);

                }

        }

        return_ACPI_STATUS (status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_initialize_objects

 *

 * PARAMETERS:  Flags           - Init/enable Options

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Completes namespace initialization by initializing device

 *              objects and executing AML code for Regions, buffers, etc.

 *

 ******************************************************************************/

acpi_status

acpi_initialize_objects (

        u32                             flags)

{

        acpi_status                     status = AE_OK;

        ACPI_FUNCTION_TRACE ("acpi_initialize_objects");

        /*

         * Install the default op_region handlers. These are installed unless

         * other handlers have already been installed via the

         * install_address_space_handler interface.

         *

         * NOTE: This will cause _REG methods to be run.  Any objects accessed

         * by the _REG methods will be automatically initialized, even if they

         * contain executable AML (see call to acpi_ns_initialize_objects below).

         */

        if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {

                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Installing default address space handlers\n"));

                status = acpi_ev_init_address_spaces ();

                if (ACPI_FAILURE (status)) {

                        return_ACPI_STATUS (status);

                }

        }

        /*

         * Initialize the objects that remain uninitialized.  This

         * runs the executable AML that may be part of the declaration of these

         * objects: operation_regions, buffer_fields, Buffers, and Packages.

         */

        if (!(flags & ACPI_NO_OBJECT_INIT)) {

                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI Objects\n"));

                status = acpi_ns_initialize_objects ();

                if (ACPI_FAILURE (status)) {

                        return_ACPI_STATUS (status);

                }

        }

        /*

         * Initialize all device objects in the namespace

         * This runs the _STA and _INI methods.

         */

        if (!(flags & ACPI_NO_DEVICE_INIT)) {

                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI Devices\n"));

                status = acpi_ns_initialize_devices ();

                if (ACPI_FAILURE (status)) {

                        return_ACPI_STATUS (status);

                }

        }

        /*

         * Empty the caches (delete the cached objects) on the assumption that

         * the table load filled them up more than they will be at runtime --

         * thus wasting non-paged memory.

         */

        status = acpi_purge_cached_objects ();

        acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;

        return_ACPI_STATUS (status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_terminate

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Shutdown the ACPI subsystem.  Release all resources.

 *

 ******************************************************************************/

acpi_status

acpi_terminate (void)

{

        acpi_status                 status;

        ACPI_FUNCTION_TRACE ("acpi_terminate");

        /* Terminate the AML Debugger if present */

        ACPI_DEBUGGER_EXEC(acpi_gbl_db_terminate_threads = TRUE);

        /* Shutdown and free all resources */

        acpi_ut_subsystem_shutdown ();

        /* Free the mutex objects */

        acpi_ut_mutex_terminate ();

#ifdef ACPI_DEBUGGER

        /* Shut down the debugger */

        acpi_db_terminate ();

#endif

        /* Now we can shutdown the OS-dependent layer */

        status = acpi_os_terminate ();

        return_ACPI_STATUS (status);

}

/*****************************************************************************

 *

 * FUNCTION:    acpi_subsystem_status

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status of the ACPI subsystem

 *

 * DESCRIPTION: Other drivers that use the ACPI subsystem should call this

 *              before making any other calls, to ensure the subsystem initial-

 *              ized successfully.

 *

 ****************************************************************************/

acpi_status

acpi_subsystem_status (void)

{

        if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {

                return (AE_OK);

        }

        else {

                return (AE_ERROR);

        }

}

/******************************************************************************

 *

 * FUNCTION:    acpi_get_system_info

 *

 * PARAMETERS:  out_buffer      - a pointer to a buffer to receive the

 *                                resources for the device

 *              buffer_length   - the number of bytes available in the buffer

 *

 * RETURN:      Status          - the status of the call

 *

 * DESCRIPTION: This function is called to get information about the current

 *              state of the ACPI subsystem.  It will return system information

 *              in the out_buffer.

 *

 *              If the function fails an appropriate status will be returned

 *              and the value of out_buffer is undefined.

 *

 ******************************************************************************/

acpi_status

acpi_get_system_info (

        struct acpi_buffer              *out_buffer)

{

        struct acpi_system_info         *info_ptr;

        u32                             i;

        acpi_status                     status;

        ACPI_FUNCTION_TRACE ("acpi_get_system_info");

        /* Parameter validation */

        status = acpi_ut_validate_buffer (out_buffer);

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        /* Validate/Allocate/Clear caller buffer */

        status = acpi_ut_initialize_buffer (out_buffer, sizeof (struct acpi_system_info));

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        /*

         * Populate the return buffer

         */

        info_ptr = (struct acpi_system_info *) out_buffer->pointer;

        info_ptr->acpi_ca_version   = ACPI_CA_VERSION;

        /* System flags (ACPI capabilities) */

        info_ptr->flags             = ACPI_SYS_MODE_ACPI;

        /* Timer resolution - 24 or 32 bits  */

        if (!acpi_gbl_FADT) {

                info_ptr->timer_resolution = 0;

        }

        else if (acpi_gbl_FADT->tmr_val_ext == 0) {

                info_ptr->timer_resolution = 24;

        }

        else {

                info_ptr->timer_resolution = 32;

        }

        /* Clear the reserved fields */

        info_ptr->reserved1         = 0;

        info_ptr->reserved2         = 0;

        /* Current debug levels */

        info_ptr->debug_layer       = acpi_dbg_layer;

        info_ptr->debug_level       = acpi_dbg_level;

        /* Current status of the ACPI tables, per table type */

        info_ptr->num_table_types = NUM_ACPI_TABLE_TYPES;

        for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {

                info_ptr->table_info[i].count = acpi_gbl_table_lists[i].count;

        }

        return_ACPI_STATUS (AE_OK);

}

/*****************************************************************************

 *

 * FUNCTION:    acpi_install_initialization_handler

 *

 * PARAMETERS:  Handler             - Callback procedure

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install an initialization handler

 *

 * TBD: When a second function is added, must save the Function also.

 *

 ****************************************************************************/

acpi_status

acpi_install_initialization_handler (

        acpi_init_handler               handler,

        u32                             function)

{

        if (!handler) {

                return (AE_BAD_PARAMETER);

        }

        if (acpi_gbl_init_handler) {

                return (AE_ALREADY_EXISTS);

        }

        acpi_gbl_init_handler = handler;

        return AE_OK;

}

/*****************************************************************************

 *

 * FUNCTION:    acpi_purge_cached_objects

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Empty all caches (delete the cached objects)

 *

 ****************************************************************************/

acpi_status

acpi_purge_cached_objects (void)

{

        ACPI_FUNCTION_TRACE ("acpi_purge_cached_objects");

        acpi_ut_delete_generic_state_cache ();

        acpi_ut_delete_object_cache ();

        acpi_ds_delete_walk_state_cache ();

        acpi_ps_delete_parse_cache ();

        return_ACPI_STATUS (AE_OK);

}