err.no Git - linux-2.6/blob - drivers/acpi/utilities/utstate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utstate - state object support procedures
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  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.
  25  *
  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.
  29  *
  30  * NO WARRANTY
  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
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45
  46 #define _COMPONENT          ACPI_UTILITIES
  47 ACPI_MODULE_NAME("utstate")
  48
  49 /*******************************************************************************
  50  *
  51  * FUNCTION:    acpi_ut_create_pkg_state_and_push
  52  *
  53  * PARAMETERS:  Object          - Object to be added to the new state
  54  *              Action          - Increment/Decrement
  55  *              state_list      - List the state will be added to
  56  *
  57  * RETURN:      Status
  58  *
  59  * DESCRIPTION: Create a new state and push it
  60  *
  61  ******************************************************************************/
  62 acpi_status
  63 acpi_ut_create_pkg_state_and_push(void *internal_object,
  64                                   void *external_object,
  65                                   u16 index,
  66                                   union acpi_generic_state **state_list)
  67 {
  68         union acpi_generic_state *state;
  69
  70         ACPI_FUNCTION_ENTRY();
  71
  72         state =
  73             acpi_ut_create_pkg_state(internal_object, external_object, index);
  74         if (!state) {
  75                 return (AE_NO_MEMORY);
  76         }
  77
  78         acpi_ut_push_generic_state(state_list, state);
  79         return (AE_OK);
  80 }
  81
  82 /*******************************************************************************
  83  *
  84  * FUNCTION:    acpi_ut_push_generic_state
  85  *
  86  * PARAMETERS:  list_head           - Head of the state stack
  87  *              State               - State object to push
  88  *
  89  * RETURN:      None
  90  *
  91  * DESCRIPTION: Push a state object onto a state stack
  92  *
  93  ******************************************************************************/
  94
  95 void
  96 acpi_ut_push_generic_state(union acpi_generic_state **list_head,
  97                            union acpi_generic_state *state)
  98 {
  99         ACPI_FUNCTION_TRACE(ut_push_generic_state);
 100
 101         /* Push the state object onto the front of the list (stack) */
 102
 103         state->common.next = *list_head;
 104         *list_head = state;
 105
 106         return_VOID;
 107 }
 108
 109 /*******************************************************************************
 110  *
 111  * FUNCTION:    acpi_ut_pop_generic_state
 112  *
 113  * PARAMETERS:  list_head           - Head of the state stack
 114  *
 115  * RETURN:      The popped state object
 116  *
 117  * DESCRIPTION: Pop a state object from a state stack
 118  *
 119  ******************************************************************************/
 120
 121 union acpi_generic_state *acpi_ut_pop_generic_state(union acpi_generic_state
 122                                                     **list_head)
 123 {
 124         union acpi_generic_state *state;
 125
 126         ACPI_FUNCTION_TRACE(ut_pop_generic_state);
 127
 128         /* Remove the state object at the head of the list (stack) */
 129
 130         state = *list_head;
 131         if (state) {
 132
 133                 /* Update the list head */
 134
 135                 *list_head = state->common.next;
 136         }
 137
 138         return_PTR(state);
 139 }
 140
 141 /*******************************************************************************
 142  *
 143  * FUNCTION:    acpi_ut_create_generic_state
 144  *
 145  * PARAMETERS:  None
 146  *
 147  * RETURN:      The new state object. NULL on failure.
 148  *
 149  * DESCRIPTION: Create a generic state object.  Attempt to obtain one from
 150  *              the global state cache;  If none available, create a new one.
 151  *
 152  ******************************************************************************/
 153
 154 union acpi_generic_state *acpi_ut_create_generic_state(void)
 155 {
 156         union acpi_generic_state *state;
 157
 158         ACPI_FUNCTION_ENTRY();
 159
 160         state = acpi_os_acquire_object(acpi_gbl_state_cache);
 161         if (state) {
 162
 163                 /* Initialize */
 164                 memset(state, 0, sizeof(union acpi_generic_state));
 165                 state->common.descriptor_type = ACPI_DESC_TYPE_STATE;
 166         }
 167
 168         return (state);
 169 }
 170
 171 /*******************************************************************************
 172  *
 173  * FUNCTION:    acpi_ut_create_thread_state
 174  *
 175  * PARAMETERS:  None
 176  *
 177  * RETURN:      New Thread State. NULL on failure
 178  *
 179  * DESCRIPTION: Create a "Thread State" - a flavor of the generic state used
 180  *              to track per-thread info during method execution
 181  *
 182  ******************************************************************************/
 183
 184 struct acpi_thread_state *acpi_ut_create_thread_state(void)
 185 {
 186         union acpi_generic_state *state;
 187
 188         ACPI_FUNCTION_TRACE(ut_create_thread_state);
 189
 190         /* Create the generic state object */
 191
 192         state = acpi_ut_create_generic_state();
 193         if (!state) {
 194                 return_PTR(NULL);
 195         }
 196
 197         /* Init fields specific to the update struct */
 198
 199         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_THREAD;
 200         state->thread.thread_id = acpi_os_get_thread_id();
 201
 202         /* Check for invalid thread ID - zero is very bad, it will break things */
 203
 204         if (!state->thread.thread_id) {
 205                 ACPI_ERROR((AE_INFO, "Invalid zero ID from AcpiOsGetThreadId"));
 206                 state->thread.thread_id = (acpi_thread_id) 1;
 207         }
 208
 209         return_PTR((struct acpi_thread_state *)state);
 210 }
 211
 212 /*******************************************************************************
 213  *
 214  * FUNCTION:    acpi_ut_create_update_state
 215  *
 216  * PARAMETERS:  Object          - Initial Object to be installed in the state
 217  *              Action          - Update action to be performed
 218  *
 219  * RETURN:      New state object, null on failure
 220  *
 221  * DESCRIPTION: Create an "Update State" - a flavor of the generic state used
 222  *              to update reference counts and delete complex objects such
 223  *              as packages.
 224  *
 225  ******************************************************************************/
 226
 227 union acpi_generic_state *acpi_ut_create_update_state(union acpi_operand_object
 228                                                       *object, u16 action)
 229 {
 230         union acpi_generic_state *state;
 231
 232         ACPI_FUNCTION_TRACE_PTR(ut_create_update_state, object);
 233
 234         /* Create the generic state object */
 235
 236         state = acpi_ut_create_generic_state();
 237         if (!state) {
 238                 return_PTR(NULL);
 239         }
 240
 241         /* Init fields specific to the update struct */
 242
 243         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_UPDATE;
 244         state->update.object = object;
 245         state->update.value = action;
 246
 247         return_PTR(state);
 248 }
 249
 250 /*******************************************************************************
 251  *
 252  * FUNCTION:    acpi_ut_create_pkg_state
 253  *
 254  * PARAMETERS:  Object          - Initial Object to be installed in the state
 255  *              Action          - Update action to be performed
 256  *
 257  * RETURN:      New state object, null on failure
 258  *
 259  * DESCRIPTION: Create a "Package State"
 260  *
 261  ******************************************************************************/
 262
 263 union acpi_generic_state *acpi_ut_create_pkg_state(void *internal_object,
 264                                                    void *external_object,
 265                                                    u16 index)
 266 {
 267         union acpi_generic_state *state;
 268
 269         ACPI_FUNCTION_TRACE_PTR(ut_create_pkg_state, internal_object);
 270
 271         /* Create the generic state object */
 272
 273         state = acpi_ut_create_generic_state();
 274         if (!state) {
 275                 return_PTR(NULL);
 276         }
 277
 278         /* Init fields specific to the update struct */
 279
 280         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_PACKAGE;
 281         state->pkg.source_object = (union acpi_operand_object *)internal_object;
 282         state->pkg.dest_object = external_object;
 283         state->pkg.index = index;
 284         state->pkg.num_packages = 1;
 285
 286         return_PTR(state);
 287 }
 288
 289 /*******************************************************************************
 290  *
 291  * FUNCTION:    acpi_ut_create_control_state
 292  *
 293  * PARAMETERS:  None
 294  *
 295  * RETURN:      New state object, null on failure
 296  *
 297  * DESCRIPTION: Create a "Control State" - a flavor of the generic state used
 298  *              to support nested IF/WHILE constructs in the AML.
 299  *
 300  ******************************************************************************/
 301
 302 union acpi_generic_state *acpi_ut_create_control_state(void)
 303 {
 304         union acpi_generic_state *state;
 305
 306         ACPI_FUNCTION_TRACE(ut_create_control_state);
 307
 308         /* Create the generic state object */
 309
 310         state = acpi_ut_create_generic_state();
 311         if (!state) {
 312                 return_PTR(NULL);
 313         }
 314
 315         /* Init fields specific to the control struct */
 316
 317         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_CONTROL;
 318         state->common.state = ACPI_CONTROL_CONDITIONAL_EXECUTING;
 319
 320         return_PTR(state);
 321 }
 322
 323 /*******************************************************************************
 324  *
 325  * FUNCTION:    acpi_ut_delete_generic_state
 326  *
 327  * PARAMETERS:  State               - The state object to be deleted
 328  *
 329  * RETURN:      None
 330  *
 331  * DESCRIPTION: Release a state object to the state cache. NULL state objects
 332  *              are ignored.
 333  *
 334  ******************************************************************************/
 335
 336 void acpi_ut_delete_generic_state(union acpi_generic_state *state)
 337 {
 338         ACPI_FUNCTION_TRACE(ut_delete_generic_state);
 339
 340         /* Ignore null state */
 341
 342         if (state) {
 343                 (void)acpi_os_release_object(acpi_gbl_state_cache, state);
 344         }
 345         return_VOID;
 346 }