1 /******************************************************************************
3 * Module Name: utxface - External interfaces for "global" ACPI functions
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2005, R. Byron Moore
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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41 * POSSIBILITY OF SUCH DAMAGES.
44 #include <linux/module.h>
46 #include <acpi/acpi.h>
47 #include <acpi/acevents.h>
48 #include <acpi/acnamesp.h>
49 #include <acpi/acdebug.h>
51 #define _COMPONENT ACPI_UTILITIES
52 ACPI_MODULE_NAME ("utxface")
55 /*******************************************************************************
57 * FUNCTION: acpi_initialize_subsystem
63 * DESCRIPTION: Initializes all global variables. This is the first function
64 * called, so any early initialization belongs here.
66 ******************************************************************************/
69 acpi_initialize_subsystem (
75 ACPI_FUNCTION_TRACE ("acpi_initialize_subsystem");
78 ACPI_DEBUG_EXEC (acpi_ut_init_stack_ptr_trace ());
80 /* Initialize the OS-Dependent layer */
82 status = acpi_os_initialize ();
83 if (ACPI_FAILURE (status)) {
84 ACPI_REPORT_ERROR (("OSD failed to initialize, %s\n",
85 acpi_format_exception (status)));
86 return_ACPI_STATUS (status);
89 /* Initialize all globals used by the subsystem */
91 acpi_ut_init_globals ();
93 /* Create the default mutex objects */
95 status = acpi_ut_mutex_initialize ();
96 if (ACPI_FAILURE (status)) {
97 ACPI_REPORT_ERROR (("Global mutex creation failure, %s\n",
98 acpi_format_exception (status)));
99 return_ACPI_STATUS (status);
103 * Initialize the namespace manager and
104 * the root of the namespace tree
106 status = acpi_ns_root_initialize ();
107 if (ACPI_FAILURE (status)) {
108 ACPI_REPORT_ERROR (("Namespace initialization failure, %s\n",
109 acpi_format_exception (status)));
110 return_ACPI_STATUS (status);
113 /* If configured, initialize the AML debugger */
115 ACPI_DEBUGGER_EXEC (status = acpi_db_initialize ());
117 return_ACPI_STATUS (status);
121 /*******************************************************************************
123 * FUNCTION: acpi_enable_subsystem
125 * PARAMETERS: Flags - Init/enable Options
129 * DESCRIPTION: Completes the subsystem initialization including hardware.
130 * Puts system into ACPI mode if it isn't already.
132 ******************************************************************************/
135 acpi_enable_subsystem (
138 acpi_status status = AE_OK;
141 ACPI_FUNCTION_TRACE ("acpi_enable_subsystem");
145 * We must initialize the hardware before we can enable ACPI.
146 * The values from the FADT are validated here.
148 if (!(flags & ACPI_NO_HARDWARE_INIT)) {
149 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
150 "[Init] Initializing ACPI hardware\n"));
152 status = acpi_hw_initialize ();
153 if (ACPI_FAILURE (status)) {
154 return_ACPI_STATUS (status);
158 /* Enable ACPI mode */
160 if (!(flags & ACPI_NO_ACPI_ENABLE)) {
161 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Going into ACPI mode\n"));
163 acpi_gbl_original_mode = acpi_hw_get_mode();
165 status = acpi_enable ();
166 if (ACPI_FAILURE (status)) {
167 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "acpi_enable failed.\n"));
168 return_ACPI_STATUS (status);
173 * Install the default op_region handlers. These are installed unless
174 * other handlers have already been installed via the
175 * install_address_space_handler interface.
177 if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
178 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
179 "[Init] Installing default address space handlers\n"));
181 status = acpi_ev_install_region_handlers ();
182 if (ACPI_FAILURE (status)) {
183 return_ACPI_STATUS (status);
188 * Initialize ACPI Event handling (Fixed and General Purpose)
190 * NOTE: We must have the hardware AND events initialized before we can
191 * execute ANY control methods SAFELY. Any control method can require
192 * ACPI hardware support, so the hardware MUST be initialized before
195 if (!(flags & ACPI_NO_EVENT_INIT)) {
196 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
197 "[Init] Initializing ACPI events\n"));
199 status = acpi_ev_initialize_events ();
200 if (ACPI_FAILURE (status)) {
201 return_ACPI_STATUS (status);
205 /* Install the SCI handler and Global Lock handler */
207 if (!(flags & ACPI_NO_HANDLER_INIT)) {
208 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
209 "[Init] Installing SCI/GL handlers\n"));
211 status = acpi_ev_install_xrupt_handlers ();
212 if (ACPI_FAILURE (status)) {
213 return_ACPI_STATUS (status);
217 return_ACPI_STATUS (status);
220 /*******************************************************************************
222 * FUNCTION: acpi_initialize_objects
224 * PARAMETERS: Flags - Init/enable Options
228 * DESCRIPTION: Completes namespace initialization by initializing device
229 * objects and executing AML code for Regions, buffers, etc.
231 ******************************************************************************/
234 acpi_initialize_objects (
237 acpi_status status = AE_OK;
240 ACPI_FUNCTION_TRACE ("acpi_initialize_objects");
244 * Run all _REG methods
246 * NOTE: Any objects accessed
247 * by the _REG methods will be automatically initialized, even if they
248 * contain executable AML (see call to acpi_ns_initialize_objects below).
250 if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
251 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
252 "[Init] Executing _REG op_region methods\n"));
254 status = acpi_ev_initialize_op_regions ();
255 if (ACPI_FAILURE (status)) {
256 return_ACPI_STATUS (status);
261 * Initialize the objects that remain uninitialized. This
262 * runs the executable AML that may be part of the declaration of these
263 * objects: operation_regions, buffer_fields, Buffers, and Packages.
265 if (!(flags & ACPI_NO_OBJECT_INIT)) {
266 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
267 "[Init] Completing Initialization of ACPI Objects\n"));
269 status = acpi_ns_initialize_objects ();
270 if (ACPI_FAILURE (status)) {
271 return_ACPI_STATUS (status);
276 * Initialize all device objects in the namespace
277 * This runs the _STA and _INI methods.
279 if (!(flags & ACPI_NO_DEVICE_INIT)) {
280 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
281 "[Init] Initializing ACPI Devices\n"));
283 status = acpi_ns_initialize_devices ();
284 if (ACPI_FAILURE (status)) {
285 return_ACPI_STATUS (status);
290 * Empty the caches (delete the cached objects) on the assumption that
291 * the table load filled them up more than they will be at runtime --
292 * thus wasting non-paged memory.
294 status = acpi_purge_cached_objects ();
296 acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
297 return_ACPI_STATUS (status);
301 /*******************************************************************************
303 * FUNCTION: acpi_terminate
309 * DESCRIPTION: Shutdown the ACPI subsystem. Release all resources.
311 ******************************************************************************/
320 ACPI_FUNCTION_TRACE ("acpi_terminate");
323 /* Terminate the AML Debugger if present */
325 ACPI_DEBUGGER_EXEC(acpi_gbl_db_terminate_threads = TRUE);
327 /* Shutdown and free all resources */
329 acpi_ut_subsystem_shutdown ();
332 /* Free the mutex objects */
334 acpi_ut_mutex_terminate ();
339 /* Shut down the debugger */
341 acpi_db_terminate ();
344 /* Now we can shutdown the OS-dependent layer */
346 status = acpi_os_terminate ();
347 return_ACPI_STATUS (status);
351 #ifdef ACPI_FUTURE_USAGE
352 /*******************************************************************************
354 * FUNCTION: acpi_subsystem_status
358 * RETURN: Status of the ACPI subsystem
360 * DESCRIPTION: Other drivers that use the ACPI subsystem should call this
361 * before making any other calls, to ensure the subsystem
362 * initialized successfully.
364 ******************************************************************************/
367 acpi_subsystem_status (
371 if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {
380 /*******************************************************************************
382 * FUNCTION: acpi_get_system_info
384 * PARAMETERS: out_buffer - A buffer to receive the resources for the
387 * RETURN: Status - the status of the call
389 * DESCRIPTION: This function is called to get information about the current
390 * state of the ACPI subsystem. It will return system information
393 * If the function fails an appropriate status will be returned
394 * and the value of out_buffer is undefined.
396 ******************************************************************************/
399 acpi_get_system_info (
400 struct acpi_buffer *out_buffer)
402 struct acpi_system_info *info_ptr;
407 ACPI_FUNCTION_TRACE ("acpi_get_system_info");
410 /* Parameter validation */
412 status = acpi_ut_validate_buffer (out_buffer);
413 if (ACPI_FAILURE (status)) {
414 return_ACPI_STATUS (status);
417 /* Validate/Allocate/Clear caller buffer */
419 status = acpi_ut_initialize_buffer (out_buffer, sizeof (struct acpi_system_info));
420 if (ACPI_FAILURE (status)) {
421 return_ACPI_STATUS (status);
425 * Populate the return buffer
427 info_ptr = (struct acpi_system_info *) out_buffer->pointer;
429 info_ptr->acpi_ca_version = ACPI_CA_VERSION;
431 /* System flags (ACPI capabilities) */
433 info_ptr->flags = ACPI_SYS_MODE_ACPI;
435 /* Timer resolution - 24 or 32 bits */
437 if (!acpi_gbl_FADT) {
438 info_ptr->timer_resolution = 0;
440 else if (acpi_gbl_FADT->tmr_val_ext == 0) {
441 info_ptr->timer_resolution = 24;
444 info_ptr->timer_resolution = 32;
447 /* Clear the reserved fields */
449 info_ptr->reserved1 = 0;
450 info_ptr->reserved2 = 0;
452 /* Current debug levels */
454 info_ptr->debug_layer = acpi_dbg_layer;
455 info_ptr->debug_level = acpi_dbg_level;
457 /* Current status of the ACPI tables, per table type */
459 info_ptr->num_table_types = NUM_ACPI_TABLE_TYPES;
460 for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
461 info_ptr->table_info[i].count = acpi_gbl_table_lists[i].count;
464 return_ACPI_STATUS (AE_OK);
466 EXPORT_SYMBOL(acpi_get_system_info);
469 /*****************************************************************************
471 * FUNCTION: acpi_install_initialization_handler
473 * PARAMETERS: Handler - Callback procedure
474 * Function - Not (currently) used, see below
478 * DESCRIPTION: Install an initialization handler
480 * TBD: When a second function is added, must save the Function also.
482 ****************************************************************************/
485 acpi_install_initialization_handler (
486 acpi_init_handler handler,
491 return (AE_BAD_PARAMETER);
494 if (acpi_gbl_init_handler) {
495 return (AE_ALREADY_EXISTS);
498 acpi_gbl_init_handler = handler;
502 #endif /* ACPI_FUTURE_USAGE */
504 /*****************************************************************************
506 * FUNCTION: acpi_purge_cached_objects
512 * DESCRIPTION: Empty all caches (delete the cached objects)
514 ****************************************************************************/
517 acpi_purge_cached_objects (
520 ACPI_FUNCTION_TRACE ("acpi_purge_cached_objects");
522 (void) acpi_os_purge_cache (acpi_gbl_state_cache);
523 (void) acpi_os_purge_cache (acpi_gbl_operand_cache);
524 (void) acpi_os_purge_cache (acpi_gbl_ps_node_cache);
525 (void) acpi_os_purge_cache (acpi_gbl_ps_node_ext_cache);
526 return_ACPI_STATUS (AE_OK);