1 /******************************************************************************
3 * Module Name: utxface - External interfaces for "global" ACPI functions
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2004, 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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35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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41 * POSSIBILITY OF SUCH DAMAGES.
45 #include <acpi/acpi.h>
46 #include <acpi/acevents.h>
47 #include <acpi/acnamesp.h>
48 #include <acpi/acparser.h>
49 #include <acpi/acdispat.h>
50 #include <acpi/acdebug.h>
52 #define _COMPONENT ACPI_UTILITIES
53 ACPI_MODULE_NAME ("utxface")
56 /*******************************************************************************
58 * FUNCTION: acpi_initialize_subsystem
64 * DESCRIPTION: Initializes all global variables. This is the first function
65 * called, so any early initialization belongs here.
67 ******************************************************************************/
70 acpi_initialize_subsystem (
75 ACPI_FUNCTION_TRACE ("acpi_initialize_subsystem");
78 ACPI_DEBUG_EXEC (acpi_ut_init_stack_ptr_trace ());
81 /* Initialize all globals used by the subsystem */
83 acpi_ut_init_globals ();
85 /* Initialize the OS-Dependent layer */
87 status = acpi_os_initialize ();
88 if (ACPI_FAILURE (status)) {
89 ACPI_REPORT_ERROR (("OSD failed to initialize, %s\n",
90 acpi_format_exception (status)));
91 return_ACPI_STATUS (status);
94 /* Create the default mutex objects */
96 status = acpi_ut_mutex_initialize ();
97 if (ACPI_FAILURE (status)) {
98 ACPI_REPORT_ERROR (("Global mutex creation failure, %s\n",
99 acpi_format_exception (status)));
100 return_ACPI_STATUS (status);
104 * Initialize the namespace manager and
105 * the root of the namespace tree
108 status = acpi_ns_root_initialize ();
109 if (ACPI_FAILURE (status)) {
110 ACPI_REPORT_ERROR (("Namespace initialization failure, %s\n",
111 acpi_format_exception (status)));
112 return_ACPI_STATUS (status);
116 /* If configured, initialize the AML debugger */
118 ACPI_DEBUGGER_EXEC (status = acpi_db_initialize ());
120 return_ACPI_STATUS (status);
124 /*******************************************************************************
126 * FUNCTION: acpi_enable_subsystem
128 * PARAMETERS: Flags - Init/enable Options
132 * DESCRIPTION: Completes the subsystem initialization including hardware.
133 * Puts system into ACPI mode if it isn't already.
135 ******************************************************************************/
138 acpi_enable_subsystem (
141 acpi_status status = AE_OK;
144 ACPI_FUNCTION_TRACE ("acpi_enable_subsystem");
148 * We must initialize the hardware before we can enable ACPI.
149 * The values from the FADT are validated here.
151 if (!(flags & ACPI_NO_HARDWARE_INIT)) {
152 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI hardware\n"));
154 status = acpi_hw_initialize ();
155 if (ACPI_FAILURE (status)) {
156 return_ACPI_STATUS (status);
160 /* Enable ACPI mode */
162 if (!(flags & ACPI_NO_ACPI_ENABLE)) {
163 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Going into ACPI mode\n"));
165 acpi_gbl_original_mode = acpi_hw_get_mode();
167 status = acpi_enable ();
168 if (ACPI_FAILURE (status)) {
169 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "acpi_enable failed.\n"));
170 return_ACPI_STATUS (status);
175 * Install the default op_region handlers. These are installed unless
176 * other handlers have already been installed via the
177 * install_address_space_handler interface.
179 if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
180 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Installing default address space handlers\n"));
182 status = acpi_ev_install_region_handlers ();
183 if (ACPI_FAILURE (status)) {
184 return_ACPI_STATUS (status);
189 * Initialize ACPI Event handling (Fixed and General Purpose)
191 * NOTE: We must have the hardware AND events initialized before we can execute
192 * ANY control methods SAFELY. Any control method can require ACPI hardware
193 * support, so the hardware MUST be initialized before execution!
195 if (!(flags & ACPI_NO_EVENT_INIT)) {
196 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI events\n"));
198 status = acpi_ev_initialize_events ();
199 if (ACPI_FAILURE (status)) {
200 return_ACPI_STATUS (status);
204 /* Install the SCI handler and Global Lock handler */
206 if (!(flags & ACPI_NO_HANDLER_INIT)) {
207 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Installing SCI/GL handlers\n"));
209 status = acpi_ev_install_xrupt_handlers ();
210 if (ACPI_FAILURE (status)) {
211 return_ACPI_STATUS (status);
215 return_ACPI_STATUS (status);
218 /*******************************************************************************
220 * FUNCTION: acpi_initialize_objects
222 * PARAMETERS: Flags - Init/enable Options
226 * DESCRIPTION: Completes namespace initialization by initializing device
227 * objects and executing AML code for Regions, buffers, etc.
229 ******************************************************************************/
232 acpi_initialize_objects (
235 acpi_status status = AE_OK;
238 ACPI_FUNCTION_TRACE ("acpi_initialize_objects");
242 * Run all _REG methods
244 * NOTE: Any objects accessed
245 * by the _REG methods will be automatically initialized, even if they
246 * contain executable AML (see call to acpi_ns_initialize_objects below).
248 if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
249 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Executing _REG op_region methods\n"));
251 status = acpi_ev_initialize_op_regions ();
252 if (ACPI_FAILURE (status)) {
253 return_ACPI_STATUS (status);
258 * Initialize the objects that remain uninitialized. This
259 * runs the executable AML that may be part of the declaration of these
260 * objects: operation_regions, buffer_fields, Buffers, and Packages.
262 if (!(flags & ACPI_NO_OBJECT_INIT)) {
263 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Completing Initialization of ACPI Objects\n"));
265 status = acpi_ns_initialize_objects ();
266 if (ACPI_FAILURE (status)) {
267 return_ACPI_STATUS (status);
272 * Initialize all device objects in the namespace
273 * This runs the _STA and _INI methods.
275 if (!(flags & ACPI_NO_DEVICE_INIT)) {
276 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI Devices\n"));
278 status = acpi_ns_initialize_devices ();
279 if (ACPI_FAILURE (status)) {
280 return_ACPI_STATUS (status);
285 * Empty the caches (delete the cached objects) on the assumption that
286 * the table load filled them up more than they will be at runtime --
287 * thus wasting non-paged memory.
289 status = acpi_purge_cached_objects ();
291 acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
292 return_ACPI_STATUS (status);
296 /*******************************************************************************
298 * FUNCTION: acpi_terminate
304 * DESCRIPTION: Shutdown the ACPI subsystem. Release all resources.
306 ******************************************************************************/
309 acpi_terminate (void)
314 ACPI_FUNCTION_TRACE ("acpi_terminate");
317 /* Terminate the AML Debugger if present */
319 ACPI_DEBUGGER_EXEC(acpi_gbl_db_terminate_threads = TRUE);
321 /* Shutdown and free all resources */
323 acpi_ut_subsystem_shutdown ();
326 /* Free the mutex objects */
328 acpi_ut_mutex_terminate ();
333 /* Shut down the debugger */
335 acpi_db_terminate ();
338 /* Now we can shutdown the OS-dependent layer */
340 status = acpi_os_terminate ();
341 return_ACPI_STATUS (status);
345 /*****************************************************************************
347 * FUNCTION: acpi_subsystem_status
351 * RETURN: Status of the ACPI subsystem
353 * DESCRIPTION: Other drivers that use the ACPI subsystem should call this
354 * before making any other calls, to ensure the subsystem initial-
357 ****************************************************************************/
360 acpi_subsystem_status (void)
362 if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {
371 /******************************************************************************
373 * FUNCTION: acpi_get_system_info
375 * PARAMETERS: out_buffer - a pointer to a buffer to receive the
376 * resources for the device
377 * buffer_length - the number of bytes available in the buffer
379 * RETURN: Status - the status of the call
381 * DESCRIPTION: This function is called to get information about the current
382 * state of the ACPI subsystem. It will return system information
385 * If the function fails an appropriate status will be returned
386 * and the value of out_buffer is undefined.
388 ******************************************************************************/
391 acpi_get_system_info (
392 struct acpi_buffer *out_buffer)
394 struct acpi_system_info *info_ptr;
399 ACPI_FUNCTION_TRACE ("acpi_get_system_info");
402 /* Parameter validation */
404 status = acpi_ut_validate_buffer (out_buffer);
405 if (ACPI_FAILURE (status)) {
406 return_ACPI_STATUS (status);
409 /* Validate/Allocate/Clear caller buffer */
411 status = acpi_ut_initialize_buffer (out_buffer, sizeof (struct acpi_system_info));
412 if (ACPI_FAILURE (status)) {
413 return_ACPI_STATUS (status);
417 * Populate the return buffer
419 info_ptr = (struct acpi_system_info *) out_buffer->pointer;
421 info_ptr->acpi_ca_version = ACPI_CA_VERSION;
423 /* System flags (ACPI capabilities) */
425 info_ptr->flags = ACPI_SYS_MODE_ACPI;
427 /* Timer resolution - 24 or 32 bits */
429 if (!acpi_gbl_FADT) {
430 info_ptr->timer_resolution = 0;
432 else if (acpi_gbl_FADT->tmr_val_ext == 0) {
433 info_ptr->timer_resolution = 24;
436 info_ptr->timer_resolution = 32;
439 /* Clear the reserved fields */
441 info_ptr->reserved1 = 0;
442 info_ptr->reserved2 = 0;
444 /* Current debug levels */
446 info_ptr->debug_layer = acpi_dbg_layer;
447 info_ptr->debug_level = acpi_dbg_level;
449 /* Current status of the ACPI tables, per table type */
451 info_ptr->num_table_types = NUM_ACPI_TABLE_TYPES;
452 for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
453 info_ptr->table_info[i].count = acpi_gbl_table_lists[i].count;
456 return_ACPI_STATUS (AE_OK);
460 /*****************************************************************************
462 * FUNCTION: acpi_install_initialization_handler
464 * PARAMETERS: Handler - Callback procedure
468 * DESCRIPTION: Install an initialization handler
470 * TBD: When a second function is added, must save the Function also.
472 ****************************************************************************/
475 acpi_install_initialization_handler (
476 acpi_init_handler handler,
481 return (AE_BAD_PARAMETER);
484 if (acpi_gbl_init_handler) {
485 return (AE_ALREADY_EXISTS);
488 acpi_gbl_init_handler = handler;
493 /*****************************************************************************
495 * FUNCTION: acpi_purge_cached_objects
501 * DESCRIPTION: Empty all caches (delete the cached objects)
503 ****************************************************************************/
506 acpi_purge_cached_objects (void)
508 ACPI_FUNCTION_TRACE ("acpi_purge_cached_objects");
511 acpi_ut_delete_generic_state_cache ();
512 acpi_ut_delete_object_cache ();
513 acpi_ds_delete_walk_state_cache ();
514 acpi_ps_delete_parse_cache ();
516 return_ACPI_STATUS (AE_OK);