drivers/acpi/acpica/utstate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utstate - state object support procedures
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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_push_generic_state
  53  *
  54  * PARAMETERS:  list_head           - Head of the state stack
  55  *              state               - State object to push
  56  *
  57  * RETURN:      None
  58  *
  59  * DESCRIPTION: Push a state object onto a state stack
  60  *
  61  ******************************************************************************/
  62 void
  63 acpi_ut_push_generic_state(union acpi_generic_state **list_head,
  64                            union acpi_generic_state *state)
  65 {
  66         ACPI_FUNCTION_ENTRY();
  67
  68         /* Push the state object onto the front of the list (stack) */
  69
  70         state->common.next = *list_head;
  71         *list_head = state;
  72         return;
  73 }
  74
  75 /*******************************************************************************
  76  *
  77  * FUNCTION:    acpi_ut_pop_generic_state
  78  *
  79  * PARAMETERS:  list_head           - Head of the state stack
  80  *
  81  * RETURN:      The popped state object
  82  *
  83  * DESCRIPTION: Pop a state object from a state stack
  84  *
  85  ******************************************************************************/
  86
  87 union acpi_generic_state *acpi_ut_pop_generic_state(union acpi_generic_state
  88                                                     **list_head)
  89 {
  90         union acpi_generic_state *state;
  91
  92         ACPI_FUNCTION_ENTRY();
  93
  94         /* Remove the state object at the head of the list (stack) */
  95
  96         state = *list_head;
  97         if (state) {
  98
  99                 /* Update the list head */
 100
 101                 *list_head = state->common.next;
 102         }
 103
 104         return (state);
 105 }
 106
 107 /*******************************************************************************
 108  *
 109  * FUNCTION:    acpi_ut_create_generic_state
 110  *
 111  * PARAMETERS:  None
 112  *
 113  * RETURN:      The new state object. NULL on failure.
 114  *
 115  * DESCRIPTION: Create a generic state object. Attempt to obtain one from
 116  *              the global state cache;  If none available, create a new one.
 117  *
 118  ******************************************************************************/
 119
 120 union acpi_generic_state *acpi_ut_create_generic_state(void)
 121 {
 122         union acpi_generic_state *state;
 123
 124         ACPI_FUNCTION_ENTRY();
 125
 126         state = acpi_os_acquire_object(acpi_gbl_state_cache);
 127         if (state) {
 128
 129                 /* Initialize */
 130                 state->common.descriptor_type = ACPI_DESC_TYPE_STATE;
 131         }
 132
 133         return (state);
 134 }
 135
 136 /*******************************************************************************
 137  *
 138  * FUNCTION:    acpi_ut_create_thread_state
 139  *
 140  * PARAMETERS:  None
 141  *
 142  * RETURN:      New Thread State. NULL on failure
 143  *
 144  * DESCRIPTION: Create a "Thread State" - a flavor of the generic state used
 145  *              to track per-thread info during method execution
 146  *
 147  ******************************************************************************/
 148
 149 struct acpi_thread_state *acpi_ut_create_thread_state(void)
 150 {
 151         union acpi_generic_state *state;
 152
 153         ACPI_FUNCTION_ENTRY();
 154
 155         /* Create the generic state object */
 156
 157         state = acpi_ut_create_generic_state();
 158         if (!state) {
 159                 return (NULL);
 160         }
 161
 162         /* Init fields specific to the update struct */
 163
 164         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_THREAD;
 165         state->thread.thread_id = acpi_os_get_thread_id();
 166
 167         /* Check for invalid thread ID - zero is very bad, it will break things */
 168
 169         if (!state->thread.thread_id) {
 170                 ACPI_ERROR((AE_INFO, "Invalid zero ID from AcpiOsGetThreadId"));
 171                 state->thread.thread_id = (acpi_thread_id) 1;
 172         }
 173
 174         return ((struct acpi_thread_state *)state);
 175 }
 176
 177 /*******************************************************************************
 178  *
 179  * FUNCTION:    acpi_ut_create_update_state
 180  *
 181  * PARAMETERS:  object          - Initial Object to be installed in the state
 182  *              action          - Update action to be performed
 183  *
 184  * RETURN:      New state object, null on failure
 185  *
 186  * DESCRIPTION: Create an "Update State" - a flavor of the generic state used
 187  *              to update reference counts and delete complex objects such
 188  *              as packages.
 189  *
 190  ******************************************************************************/
 191
 192 union acpi_generic_state *acpi_ut_create_update_state(union acpi_operand_object
 193                                                       *object, u16 action)
 194 {
 195         union acpi_generic_state *state;
 196
 197         ACPI_FUNCTION_ENTRY();
 198
 199         /* Create the generic state object */
 200
 201         state = acpi_ut_create_generic_state();
 202         if (!state) {
 203                 return (NULL);
 204         }
 205
 206         /* Init fields specific to the update struct */
 207
 208         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_UPDATE;
 209         state->update.object = object;
 210         state->update.value = action;
 211         return (state);
 212 }
 213
 214 /*******************************************************************************
 215  *
 216  * FUNCTION:    acpi_ut_create_pkg_state
 217  *
 218  * PARAMETERS:  object          - Initial Object to be installed in the state
 219  *              action          - Update action to be performed
 220  *
 221  * RETURN:      New state object, null on failure
 222  *
 223  * DESCRIPTION: Create a "Package State"
 224  *
 225  ******************************************************************************/
 226
 227 union acpi_generic_state *acpi_ut_create_pkg_state(void *internal_object,
 228                                                    void *external_object,
 229                                                    u16 index)
 230 {
 231         union acpi_generic_state *state;
 232
 233         ACPI_FUNCTION_ENTRY();
 234
 235         /* Create the generic state object */
 236
 237         state = acpi_ut_create_generic_state();
 238         if (!state) {
 239                 return (NULL);
 240         }
 241
 242         /* Init fields specific to the update struct */
 243
 244         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_PACKAGE;
 245         state->pkg.source_object = (union acpi_operand_object *)internal_object;
 246         state->pkg.dest_object = external_object;
 247         state->pkg.index = index;
 248         state->pkg.num_packages = 1;
 249         return (state);
 250 }
 251
 252 /*******************************************************************************
 253  *
 254  * FUNCTION:    acpi_ut_create_control_state
 255  *
 256  * PARAMETERS:  None
 257  *
 258  * RETURN:      New state object, null on failure
 259  *
 260  * DESCRIPTION: Create a "Control State" - a flavor of the generic state used
 261  *              to support nested IF/WHILE constructs in the AML.
 262  *
 263  ******************************************************************************/
 264
 265 union acpi_generic_state *acpi_ut_create_control_state(void)
 266 {
 267         union acpi_generic_state *state;
 268
 269         ACPI_FUNCTION_ENTRY();
 270
 271         /* Create the generic state object */
 272
 273         state = acpi_ut_create_generic_state();
 274         if (!state) {
 275                 return (NULL);
 276         }
 277
 278         /* Init fields specific to the control struct */
 279
 280         state->common.descriptor_type = ACPI_DESC_TYPE_STATE_CONTROL;
 281         state->common.state = ACPI_CONTROL_CONDITIONAL_EXECUTING;
 282         return (state);
 283 }
 284
 285 /*******************************************************************************
 286  *
 287  * FUNCTION:    acpi_ut_delete_generic_state
 288  *
 289  * PARAMETERS:  state               - The state object to be deleted
 290  *
 291  * RETURN:      None
 292  *
 293  * DESCRIPTION: Release a state object to the state cache. NULL state objects
 294  *              are ignored.
 295  *
 296  ******************************************************************************/
 297
 298 void acpi_ut_delete_generic_state(union acpi_generic_state *state)
 299 {
 300         ACPI_FUNCTION_ENTRY();
 301
 302         /* Ignore null state */
 303
 304         if (state) {
 305                 (void)acpi_os_release_object(acpi_gbl_state_cache, state);
 306         }
 307         return;
 308 }