release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/utstate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utstate - state object support procedures
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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_TRACE(ut_push_generic_state);
 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
 107         return_VOID;
 108 }
 109
 110 /*******************************************************************************
 111  *
 112  * FUNCTION:    acpi_ut_pop_generic_state
 113  *
 114  * PARAMETERS:  list_head           - Head of the state stack
 115  *
 116  * RETURN:      The popped state object
 117  *
 118  * DESCRIPTION: Pop a state object from a state stack
 119  *
 120  ******************************************************************************/
 121
 122 union acpi_generic_state *acpi_ut_pop_generic_state(union acpi_generic_state
 123                                                     **list_head)
 124 {
 125         union acpi_generic_state *state;
 126
 127         ACPI_FUNCTION_TRACE(ut_pop_generic_state);
 128
 129         /* Remove the state object at the head of the list (stack) */
 130
 131         state = *list_head;
 132         if (state) {
 133
 134                 /* Update the list head */
 135
 136                 *list_head = state->common.next;
 137         }
 138
 139         return_PTR(state);
 140 }
 141
 142 /*******************************************************************************
 143  *
 144  * FUNCTION:    acpi_ut_create_generic_state
 145  *
 146  * PARAMETERS:  None
 147  *
 148  * RETURN:      The new state object. NULL on failure.
 149  *
 150  * DESCRIPTION: Create a generic state object.  Attempt to obtain one from
 151  *              the global state cache;  If none available, create a new one.
 152  *
 153  ******************************************************************************/
 154
 155 union acpi_generic_state *acpi_ut_create_generic_state(void)
 156 {
 157         union acpi_generic_state *state;
 158
 159         ACPI_FUNCTION_ENTRY();
 160
 161         state = acpi_os_acquire_object(acpi_gbl_state_cache);
 162         if (state) {
 163
 164                 /* Initialize */
 165                 memset(state, 0, sizeof(union acpi_generic_state));
 166                 state->common.descriptor_type = ACPI_DESC_TYPE_STATE;
 167         }
 168
 169         return (state);
 170 }
 171
 172 /*******************************************************************************
 173  *
 174  * FUNCTION:    acpi_ut_create_thread_state
 175  *
 176  * PARAMETERS:  None
 177  *
 178  * RETURN:      New Thread State. NULL on failure
 179  *
 180  * DESCRIPTION: Create a "Thread State" - a flavor of the generic state used
 181  *              to track per-thread info during method execution
 182  *
 183  ******************************************************************************/
 184
 185 struct acpi_thread_state *acpi_ut_create_thread_state(void)
 186 {
 187         union acpi_generic_state *state;
 188
 189         ACPI_FUNCTION_TRACE(ut_create_thread_state);
 190
 191         /* Create the generic state object */
 192
 193         state = acpi_ut_create_generic_state();
 194         if (!state) {
 195                 return_PTR(NULL);
 196         }
 197
 198         /* Init fields specific to the update struct */
 199
 200         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_THREAD;
 201         state->thread.thread_id = acpi_os_get_thread_id();
 202
 203         /* Check for invalid thread ID - zero is very bad, it will break things */
 204
 205         if (!state->thread.thread_id) {
 206                 ACPI_ERROR((AE_INFO, "Invalid zero ID from AcpiOsGetThreadId"));
 207                 state->thread.thread_id = (acpi_thread_id) 1;
 208         }
 209
 210         return_PTR((struct acpi_thread_state *)state);
 211 }
 212
 213 /*******************************************************************************
 214  *
 215  * FUNCTION:    acpi_ut_create_update_state
 216  *
 217  * PARAMETERS:  Object          - Initial Object to be installed in the state
 218  *              Action          - Update action to be performed
 219  *
 220  * RETURN:      New state object, null on failure
 221  *
 222  * DESCRIPTION: Create an "Update State" - a flavor of the generic state used
 223  *              to update reference counts and delete complex objects such
 224  *              as packages.
 225  *
 226  ******************************************************************************/
 227
 228 union acpi_generic_state *acpi_ut_create_update_state(union acpi_operand_object
 229                                                       *object, u16 action)
 230 {
 231         union acpi_generic_state *state;
 232
 233         ACPI_FUNCTION_TRACE_PTR(ut_create_update_state, object);
 234
 235         /* Create the generic state object */
 236
 237         state = acpi_ut_create_generic_state();
 238         if (!state) {
 239                 return_PTR(NULL);
 240         }
 241
 242         /* Init fields specific to the update struct */
 243
 244         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_UPDATE;
 245         state->update.object = object;
 246         state->update.value = action;
 247
 248         return_PTR(state);
 249 }
 250
 251 /*******************************************************************************
 252  *
 253  * FUNCTION:    acpi_ut_create_pkg_state
 254  *
 255  * PARAMETERS:  Object          - Initial Object to be installed in the state
 256  *              Action          - Update action to be performed
 257  *
 258  * RETURN:      New state object, null on failure
 259  *
 260  * DESCRIPTION: Create a "Package State"
 261  *
 262  ******************************************************************************/
 263
 264 union acpi_generic_state *acpi_ut_create_pkg_state(void *internal_object,
 265                                                    void *external_object,
 266                                                    u16 index)
 267 {
 268         union acpi_generic_state *state;
 269
 270         ACPI_FUNCTION_TRACE_PTR(ut_create_pkg_state, internal_object);
 271
 272         /* Create the generic state object */
 273
 274         state = acpi_ut_create_generic_state();
 275         if (!state) {
 276                 return_PTR(NULL);
 277         }
 278
 279         /* Init fields specific to the update struct */
 280
 281         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_PACKAGE;
 282         state->pkg.source_object = (union acpi_operand_object *)internal_object;
 283         state->pkg.dest_object = external_object;
 284         state->pkg.index = index;
 285         state->pkg.num_packages = 1;
 286
 287         return_PTR(state);
 288 }
 289
 290 /*******************************************************************************
 291  *
 292  * FUNCTION:    acpi_ut_create_control_state
 293  *
 294  * PARAMETERS:  None
 295  *
 296  * RETURN:      New state object, null on failure
 297  *
 298  * DESCRIPTION: Create a "Control State" - a flavor of the generic state used
 299  *              to support nested IF/WHILE constructs in the AML.
 300  *
 301  ******************************************************************************/
 302
 303 union acpi_generic_state *acpi_ut_create_control_state(void)
 304 {
 305         union acpi_generic_state *state;
 306
 307         ACPI_FUNCTION_TRACE(ut_create_control_state);
 308
 309         /* Create the generic state object */
 310
 311         state = acpi_ut_create_generic_state();
 312         if (!state) {
 313                 return_PTR(NULL);
 314         }
 315
 316         /* Init fields specific to the control struct */
 317
 318         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_CONTROL;
 319         state->common.state = ACPI_CONTROL_CONDITIONAL_EXECUTING;
 320
 321         return_PTR(state);
 322 }
 323
 324 /*******************************************************************************
 325  *
 326  * FUNCTION:    acpi_ut_delete_generic_state
 327  *
 328  * PARAMETERS:  State               - The state object to be deleted
 329  *
 330  * RETURN:      None
 331  *
 332  * DESCRIPTION: Release a state object to the state cache. NULL state objects
 333  *              are ignored.
 334  *
 335  ******************************************************************************/
 336
 337 void acpi_ut_delete_generic_state(union acpi_generic_state *state)
 338 {
 339         ACPI_FUNCTION_TRACE(ut_delete_generic_state);
 340
 341         /* Ignore null state */
 342
 343         if (state) {
 344                 (void)acpi_os_release_object(acpi_gbl_state_cache, state);
 345         }
 346         return_VOID;
 347 }