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

 *

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

 *

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

/*

 * Copyright (C) 2000 - 2007, 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/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 __init acpi_initialize_subsystem(void)

{

        acpi_status status;

        ACPI_FUNCTION_TRACE(acpi_initialize_subsystem);

        acpi_gbl_startup_flags = ACPI_SUBSYSTEM_INITIALIZE;

        ACPI_DEBUG_EXEC(acpi_ut_init_stack_ptr_trace());

        /* Initialize the OS-Dependent layer */

        status = acpi_os_initialize();

        if (ACPI_FAILURE(status)) {

                ACPI_EXCEPTION((AE_INFO, status, "During OSL initialization"));

                return_ACPI_STATUS(status);

        }

        /* Initialize all globals used by the subsystem */

        acpi_ut_init_globals();

        /* Create the default mutex objects */

        status = acpi_ut_mutex_initialize();

        if (ACPI_FAILURE(status)) {

                ACPI_EXCEPTION((AE_INFO, status,

                                "During Global Mutex creation"));

                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_EXCEPTION((AE_INFO, status,

                                "During Namespace initialization"));

                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);

        /* 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_WARNING((AE_INFO, "AcpiEnable failed"));

                        return_ACPI_STATUS(status);

                }

        }

        /*

         * Install the default op_region handlers. These are installed unless

         * other handlers have already been installed via the

         * install_address_space_handler interface.

         */

        if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {

                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,

                                  "[Init] Installing default address space handlers\n"));

                status = acpi_ev_install_region_handlers();

                if (ACPI_FAILURE(status)) {

                        return_ACPI_STATUS(status);

                }

        }

        /*

         * Initialize ACPI Event handling (Fixed and General Purpose)

         *

         * Note1: 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 fully initialized before

         * any method execution!

         *

         * Note2: Fixed events are initialized and enabled here. GPEs are

         * initialized, but cannot be enabled until after the hardware is

         * completely initialized (SCI and global_lock activated)

         */

        if (!(flags & ACPI_NO_EVENT_INIT)) {

                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,

                                  "[Init] Initializing ACPI events\n"));

                status = acpi_ev_initialize_events();

                if (ACPI_FAILURE(status)) {

                        return_ACPI_STATUS(status);

                }

        }

        /*

         * Install the SCI handler and Global Lock handler. This completes the

         * hardware initialization.

         */

        if (!(flags & ACPI_NO_HANDLER_INIT)) {

                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,

                                  "[Init] Installing SCI/GL handlers\n"));

                status = acpi_ev_install_xrupt_handlers();

                if (ACPI_FAILURE(status)) {

                        return_ACPI_STATUS(status);

                }

        }

        /*

         * Complete the GPE initialization for the GPE blocks defined in the FADT

         * (GPE block 0 and 1).

         *

         * Note1: This is where the _PRW methods are executed for the GPEs. These

         * methods can only be executed after the SCI and Global Lock handlers are

         * installed and initialized.

         *

         * Note2: Currently, there seems to be no need to run the _REG methods

         * before execution of the _PRW methods and enabling of the GPEs.

         */

        if (!(flags & ACPI_NO_EVENT_INIT)) {

                status = acpi_ev_install_fadt_gpes();

                if (ACPI_FAILURE(status)) {

                        return (status);

                }

        }

        return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_enable_subsystem)

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

 *

 * 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);

        /*

         * Run all _REG methods

         *

         * Note: Any objects accessed by the _REG methods will be automatically

         * initialized, even if they contain executable AML (see the call to

         * acpi_ns_initialize_objects below).

         */

        if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {

                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,

                                  "[Init] Executing _REG OpRegion methods\n"));

                status = acpi_ev_initialize_op_regions();

                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] Completing Initialization of 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 device

         * _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);

}

ACPI_EXPORT_SYMBOL(acpi_initialize_objects)

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

 *

 * 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);

}

ACPI_EXPORT_SYMBOL(acpi_terminate)

#ifdef ACPI_FUTURE_USAGE

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

 *

 * 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

 *              initialized successfully.

 *

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

acpi_status acpi_subsystem_status(void)

{

        if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {

                return (AE_OK);

        } else {

                return (AE_ERROR);

        }

}

ACPI_EXPORT_SYMBOL(acpi_subsystem_status)

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

 *

 * FUNCTION:    acpi_get_system_info

 *

 * PARAMETERS:  out_buffer      - A buffer to receive the resources for the

 *                                device

 *

 * 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;

        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.flags & ACPI_FADT_32BIT_TIMER) {

                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;

        return_ACPI_STATUS(AE_OK);

}

ACPI_EXPORT_SYMBOL(acpi_get_system_info)

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

 *

 * FUNCTION:    acpi_install_initialization_handler

 *

 * PARAMETERS:  Handler             - Callback procedure

 *              Function            - Not (currently) used, see below

 *

 * 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;

}

ACPI_EXPORT_SYMBOL(acpi_install_initialization_handler)

#endif                          /*  ACPI_FUTURE_USAGE  */

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

 *

 * 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);

        (void)acpi_os_purge_cache(acpi_gbl_state_cache);

        (void)acpi_os_purge_cache(acpi_gbl_operand_cache);

        (void)acpi_os_purge_cache(acpi_gbl_ps_node_cache);

        (void)acpi_os_purge_cache(acpi_gbl_ps_node_ext_cache);

        return_ACPI_STATUS(AE_OK);

}

ACPI_EXPORT_SYMBOL(acpi_purge_cached_objects)