utxfinit.c

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/******************************************************************************
 *
 * Module Name: utxfinit - External interfaces for ACPICA initialization
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2012, 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 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 <linux/export.h>
#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"
#include "acnamesp.h"
#include "acdebug.h"
#include "actables.h"

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utxfinit")

/*******************************************************************************
 *
 * 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_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 */

    status = acpi_ut_init_globals();
    if (ACPI_FAILURE(status)) {
        ACPI_EXCEPTION((AE_INFO, status,
                "During initialization of globals"));
        return_ACPI_STATUS(status);
    }

    /* 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);
    }

    /* Initialize the global OSI interfaces list with the static names */

    status = acpi_ut_initialize_interfaces();
    if (ACPI_FAILURE(status)) {
        ACPI_EXCEPTION((AE_INFO, status,
                "During OSI interfaces initialization"));
        return_ACPI_STATUS(status);
    }

    /* If configured, initialize the AML debugger */

    ACPI_DEBUGGER_EXEC(status = acpi_db_initialize());
    return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_initialize_subsystem)

/*******************************************************************************
 *
 * 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);

#if (!ACPI_REDUCED_HARDWARE)

    /* 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);
        }
    }

    /*
     * Obtain a permanent mapping for the FACS. This is required for the
     * Global Lock and the Firmware Waking Vector
     */
    status = acpi_tb_initialize_facs();
    if (ACPI_FAILURE(status)) {
        ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
        return_ACPI_STATUS(status);
    }
#endif              /* !ACPI_REDUCED_HARDWARE */

    /*
     * 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);
        }
    }
#if (!ACPI_REDUCED_HARDWARE)
    /*
     * 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) and the various
     * initialization control methods are run (_REG, _STA, _INI) on the
     * entire namespace.
     */
    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);
        }
    }
#endif              /* !ACPI_REDUCED_HARDWARE */

    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);
        }
    }

    /*
     * Execute any module-level code that was detected during the table load
     * phase. Although illegal since ACPI 2.0, there are many machines that
     * contain this type of code. Each block of detected executable AML code
     * outside of any control method is wrapped with a temporary control
     * method object and placed on a global list. The methods on this list
     * are executed below.
     */
    acpi_ns_exec_module_code_list();

    /*
     * 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)