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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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);
163 if (!(flags & ACPI_NO_ACPI_ENABLE)) {
164 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Going into ACPI mode\n"));
166 acpi_gbl_original_mode = acpi_hw_get_mode();
168 status = acpi_enable ();
169 if (ACPI_FAILURE (status)) {
170 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "acpi_enable failed.\n"));
171 return_ACPI_STATUS (status);
176 * Initialize ACPI Event handling
178 * NOTE: We must have the hardware AND events initialized before we can execute
179 * ANY control methods SAFELY. Any control method can require ACPI hardware
180 * support, so the hardware MUST be initialized before execution!
182 if (!(flags & ACPI_NO_EVENT_INIT)) {
183 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI events\n"));
185 status = acpi_ev_initialize ();
186 if (ACPI_FAILURE (status)) {
187 return_ACPI_STATUS (status);
191 /* Install the SCI handler, Global Lock handler, and GPE handlers */
193 if (!(flags & ACPI_NO_HANDLER_INIT)) {
194 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Installing SCI/GL/GPE handlers\n"));
196 status = acpi_ev_handler_initialize ();
197 if (ACPI_FAILURE (status)) {
198 return_ACPI_STATUS (status);
202 return_ACPI_STATUS (status);
205 /*******************************************************************************
207 * FUNCTION: acpi_initialize_objects
209 * PARAMETERS: Flags - Init/enable Options
213 * DESCRIPTION: Completes namespace initialization by initializing device
214 * objects and executing AML code for Regions, buffers, etc.
216 ******************************************************************************/
219 acpi_initialize_objects (
222 acpi_status status = AE_OK;
225 ACPI_FUNCTION_TRACE ("acpi_initialize_objects");
229 * Install the default op_region handlers. These are installed unless
230 * other handlers have already been installed via the
231 * install_address_space_handler interface.
233 * NOTE: This will cause _REG methods to be run. Any objects accessed
234 * by the _REG methods will be automatically initialized, even if they
235 * contain executable AML (see call to acpi_ns_initialize_objects below).
237 if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
238 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Installing default address space handlers\n"));
240 status = acpi_ev_init_address_spaces ();
241 if (ACPI_FAILURE (status)) {
242 return_ACPI_STATUS (status);
247 * Initialize the objects that remain uninitialized. This
248 * runs the executable AML that may be part of the declaration of these
249 * objects: operation_regions, buffer_fields, Buffers, and Packages.
251 if (!(flags & ACPI_NO_OBJECT_INIT)) {
252 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI Objects\n"));
254 status = acpi_ns_initialize_objects ();
255 if (ACPI_FAILURE (status)) {
256 return_ACPI_STATUS (status);
261 * Initialize all device objects in the namespace
262 * This runs the _STA and _INI methods.
264 if (!(flags & ACPI_NO_DEVICE_INIT)) {
265 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI Devices\n"));
267 status = acpi_ns_initialize_devices ();
268 if (ACPI_FAILURE (status)) {
269 return_ACPI_STATUS (status);
274 * Empty the caches (delete the cached objects) on the assumption that
275 * the table load filled them up more than they will be at runtime --
276 * thus wasting non-paged memory.
278 status = acpi_purge_cached_objects ();
280 acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
281 return_ACPI_STATUS (status);
285 /*******************************************************************************
287 * FUNCTION: acpi_terminate
293 * DESCRIPTION: Shutdown the ACPI subsystem. Release all resources.
295 ******************************************************************************/
298 acpi_terminate (void)
303 ACPI_FUNCTION_TRACE ("acpi_terminate");
306 /* Terminate the AML Debugger if present */
308 ACPI_DEBUGGER_EXEC(acpi_gbl_db_terminate_threads = TRUE);
310 /* Shutdown and free all resources */
312 acpi_ut_subsystem_shutdown ();
315 /* Free the mutex objects */
317 acpi_ut_mutex_terminate ();
322 /* Shut down the debugger */
324 acpi_db_terminate ();
327 /* Now we can shutdown the OS-dependent layer */
329 status = acpi_os_terminate ();
330 return_ACPI_STATUS (status);
334 /*****************************************************************************
336 * FUNCTION: acpi_subsystem_status
340 * RETURN: Status of the ACPI subsystem
342 * DESCRIPTION: Other drivers that use the ACPI subsystem should call this
343 * before making any other calls, to ensure the subsystem initial-
346 ****************************************************************************/
349 acpi_subsystem_status (void)
351 if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {
360 /******************************************************************************
362 * FUNCTION: acpi_get_system_info
364 * PARAMETERS: out_buffer - a pointer to a buffer to receive the
365 * resources for the device
366 * buffer_length - the number of bytes available in the buffer
368 * RETURN: Status - the status of the call
370 * DESCRIPTION: This function is called to get information about the current
371 * state of the ACPI subsystem. It will return system information
374 * If the function fails an appropriate status will be returned
375 * and the value of out_buffer is undefined.
377 ******************************************************************************/
380 acpi_get_system_info (
381 struct acpi_buffer *out_buffer)
383 struct acpi_system_info *info_ptr;
388 ACPI_FUNCTION_TRACE ("acpi_get_system_info");
391 /* Parameter validation */
393 status = acpi_ut_validate_buffer (out_buffer);
394 if (ACPI_FAILURE (status)) {
395 return_ACPI_STATUS (status);
398 /* Validate/Allocate/Clear caller buffer */
400 status = acpi_ut_initialize_buffer (out_buffer, sizeof (struct acpi_system_info));
401 if (ACPI_FAILURE (status)) {
402 return_ACPI_STATUS (status);
406 * Populate the return buffer
408 info_ptr = (struct acpi_system_info *) out_buffer->pointer;
410 info_ptr->acpi_ca_version = ACPI_CA_VERSION;
412 /* System flags (ACPI capabilities) */
414 info_ptr->flags = ACPI_SYS_MODE_ACPI;
416 /* Timer resolution - 24 or 32 bits */
418 if (!acpi_gbl_FADT) {
419 info_ptr->timer_resolution = 0;
421 else if (acpi_gbl_FADT->tmr_val_ext == 0) {
422 info_ptr->timer_resolution = 24;
425 info_ptr->timer_resolution = 32;
428 /* Clear the reserved fields */
430 info_ptr->reserved1 = 0;
431 info_ptr->reserved2 = 0;
433 /* Current debug levels */
435 info_ptr->debug_layer = acpi_dbg_layer;
436 info_ptr->debug_level = acpi_dbg_level;
438 /* Current status of the ACPI tables, per table type */
440 info_ptr->num_table_types = NUM_ACPI_TABLE_TYPES;
441 for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
442 info_ptr->table_info[i].count = acpi_gbl_table_lists[i].count;
445 return_ACPI_STATUS (AE_OK);
449 /*****************************************************************************
451 * FUNCTION: acpi_install_initialization_handler
453 * PARAMETERS: Handler - Callback procedure
457 * DESCRIPTION: Install an initialization handler
459 * TBD: When a second function is added, must save the Function also.
461 ****************************************************************************/
464 acpi_install_initialization_handler (
465 acpi_init_handler handler,
470 return (AE_BAD_PARAMETER);
473 if (acpi_gbl_init_handler) {
474 return (AE_ALREADY_EXISTS);
477 acpi_gbl_init_handler = handler;
482 /*****************************************************************************
484 * FUNCTION: acpi_purge_cached_objects
490 * DESCRIPTION: Empty all caches (delete the cached objects)
492 ****************************************************************************/
495 acpi_purge_cached_objects (void)
497 ACPI_FUNCTION_TRACE ("acpi_purge_cached_objects");
500 acpi_ut_delete_generic_state_cache ();
501 acpi_ut_delete_object_cache ();
502 acpi_ds_delete_walk_state_cache ();
503 acpi_ps_delete_parse_cache ();
505 return_ACPI_STATUS (AE_OK);