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utxface.c

/******************************************************************************
 *
 * 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)

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