drivers/acpi/acpica/utstate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utstate - state object support procedures
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   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 #include "accommon.h"
  46
  47 #define _COMPONENT          ACPI_UTILITIES
  48 ACPI_MODULE_NAME("utstate")
  49
  50 /*******************************************************************************
  51  *
  52  * FUNCTION:    acpi_ut_create_pkg_state_and_push
  53  *
  54  * PARAMETERS:  object          - Object to be added to the new state
  55  *              action          - Increment/Decrement
  56  *              state_list      - List the state will be added to
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Create a new state and push it
  61  *
  62  ******************************************************************************/
  63 acpi_status
  64 acpi_ut_create_pkg_state_and_push(void *internal_object,
  65                                   void *external_object,
  66                                   u16 index,
  67                                   union acpi_generic_state **state_list)
  68 {
  69         union acpi_generic_state *state;
  70
  71         ACPI_FUNCTION_ENTRY();
  72
  73         state =
  74             acpi_ut_create_pkg_state(internal_object, external_object, index);
  75         if (!state) {
  76                 return (AE_NO_MEMORY);
  77         }
  78
  79         acpi_ut_push_generic_state(state_list, state);
  80         return (AE_OK);
  81 }
  82
  83 /*******************************************************************************
  84  *
  85  * FUNCTION:    acpi_ut_push_generic_state
  86  *
  87  * PARAMETERS:  list_head           - Head of the state stack
  88  *              state               - State object to push
  89  *
  90  * RETURN:      None
  91  *
  92  * DESCRIPTION: Push a state object onto a state stack
  93  *
  94  ******************************************************************************/
  95
  96 void
  97 acpi_ut_push_generic_state(union acpi_generic_state **list_head,
  98                            union acpi_generic_state *state)
  99 {
 100         ACPI_FUNCTION_ENTRY();
 101
 102         /* Push the state object onto the front of the list (stack) */
 103
 104         state->common.next = *list_head;
 105         *list_head = state;
 106         return;
 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_ENTRY();
 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 (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                 state->common.descriptor_type = ACPI_DESC_TYPE_STATE;
 165         }
 166
 167         return (state);
 168 }
 169
 170 /*******************************************************************************
 171  *
 172  * FUNCTION:    acpi_ut_create_thread_state
 173  *
 174  * PARAMETERS:  None
 175  *
 176  * RETURN:      New Thread State. NULL on failure
 177  *
 178  * DESCRIPTION: Create a "Thread State" - a flavor of the generic state used
 179  *              to track per-thread info during method execution
 180  *
 181  ******************************************************************************/
 182
 183 struct acpi_thread_state *acpi_ut_create_thread_state(void)
 184 {
 185         union acpi_generic_state *state;
 186
 187         ACPI_FUNCTION_ENTRY();
 188
 189         /* Create the generic state object */
 190
 191         state = acpi_ut_create_generic_state();
 192         if (!state) {
 193                 return (NULL);
 194         }
 195
 196         /* Init fields specific to the update struct */
 197
 198         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_THREAD;
 199         state->thread.thread_id = acpi_os_get_thread_id();
 200
 201         /* Check for invalid thread ID - zero is very bad, it will break things */
 202
 203         if (!state->thread.thread_id) {
 204                 ACPI_ERROR((AE_INFO, "Invalid zero ID from AcpiOsGetThreadId"));
 205                 state->thread.thread_id = (acpi_thread_id) 1;
 206         }
 207
 208         return ((struct acpi_thread_state *)state);
 209 }
 210
 211 /*******************************************************************************
 212  *
 213  * FUNCTION:    acpi_ut_create_update_state
 214  *
 215  * PARAMETERS:  object          - Initial Object to be installed in the state
 216  *              action          - Update action to be performed
 217  *
 218  * RETURN:      New state object, null on failure
 219  *
 220  * DESCRIPTION: Create an "Update State" - a flavor of the generic state used
 221  *              to update reference counts and delete complex objects such
 222  *              as packages.
 223  *
 224  ******************************************************************************/
 225
 226 union acpi_generic_state *acpi_ut_create_update_state(union acpi_operand_object
 227                                                       *object, u16 action)
 228 {
 229         union acpi_generic_state *state;
 230
 231         ACPI_FUNCTION_ENTRY();
 232
 233         /* Create the generic state object */
 234
 235         state = acpi_ut_create_generic_state();
 236         if (!state) {
 237                 return (NULL);
 238         }
 239
 240         /* Init fields specific to the update struct */
 241
 242         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_UPDATE;
 243         state->update.object = object;
 244         state->update.value = action;
 245         return (state);
 246 }
 247
 248 /*******************************************************************************
 249  *
 250  * FUNCTION:    acpi_ut_create_pkg_state
 251  *
 252  * PARAMETERS:  object          - Initial Object to be installed in the state
 253  *              action          - Update action to be performed
 254  *
 255  * RETURN:      New state object, null on failure
 256  *
 257  * DESCRIPTION: Create a "Package State"
 258  *
 259  ******************************************************************************/
 260
 261 union acpi_generic_state *acpi_ut_create_pkg_state(void *internal_object,
 262                                                    void *external_object,
 263                                                    u16 index)
 264 {
 265         union acpi_generic_state *state;
 266
 267         ACPI_FUNCTION_ENTRY();
 268
 269         /* Create the generic state object */
 270
 271         state = acpi_ut_create_generic_state();
 272         if (!state) {
 273                 return (NULL);
 274         }
 275
 276         /* Init fields specific to the update struct */
 277
 278         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_PACKAGE;
 279         state->pkg.source_object = (union acpi_operand_object *)internal_object;
 280         state->pkg.dest_object = external_object;
 281         state->pkg.index = index;
 282         state->pkg.num_packages = 1;
 283         return (state);
 284 }
 285
 286 /*******************************************************************************
 287  *
 288  * FUNCTION:    acpi_ut_create_control_state
 289  *
 290  * PARAMETERS:  None
 291  *
 292  * RETURN:      New state object, null on failure
 293  *
 294  * DESCRIPTION: Create a "Control State" - a flavor of the generic state used
 295  *              to support nested IF/WHILE constructs in the AML.
 296  *
 297  ******************************************************************************/
 298
 299 union acpi_generic_state *acpi_ut_create_control_state(void)
 300 {
 301         union acpi_generic_state *state;
 302
 303         ACPI_FUNCTION_ENTRY();
 304
 305         /* Create the generic state object */
 306
 307         state = acpi_ut_create_generic_state();
 308         if (!state) {
 309                 return (NULL);
 310         }
 311
 312         /* Init fields specific to the control struct */
 313
 314         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_CONTROL;
 315         state->common.state = ACPI_CONTROL_CONDITIONAL_EXECUTING;
 316         return (state);
 317 }
 318
 319 /*******************************************************************************
 320  *
 321  * FUNCTION:    acpi_ut_delete_generic_state
 322  *
 323  * PARAMETERS:  state               - The state object to be deleted
 324  *
 325  * RETURN:      None
 326  *
 327  * DESCRIPTION: Release a state object to the state cache. NULL state objects
 328  *              are ignored.
 329  *
 330  ******************************************************************************/
 331
 332 void acpi_ut_delete_generic_state(union acpi_generic_state *state)
 333 {
 334         ACPI_FUNCTION_ENTRY();
 335
 336         /* Ignore null state */
 337
 338         if (state) {
 339                 (void)acpi_os_release_object(acpi_gbl_state_cache, state);
 340         }
 341         return;
 342 }