drivers/bus/acpi/acpica/utilities/utstate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utstate - state object support procedures
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2018, 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.h"
  45 #include "accommon.h"
  46
  47 #define _COMPONENT          ACPI_UTILITIES
  48         ACPI_MODULE_NAME    ("utstate")
  49
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    AcpiUtPushGenericState
  54  *
  55  * PARAMETERS:  ListHead            - Head of the state stack
  56  *              State               - State object to push
  57  *
  58  * RETURN:      None
  59  *
  60  * DESCRIPTION: Push a state object onto a state stack
  61  *
  62  ******************************************************************************/
  63
  64 void
  65 AcpiUtPushGenericState (
  66     ACPI_GENERIC_STATE      **ListHead,
  67     ACPI_GENERIC_STATE      *State)
  68 {
  69     ACPI_FUNCTION_ENTRY ();
  70
  71
  72     /* Push the state object onto the front of the list (stack) */
  73
  74     State->Common.Next = *ListHead;
  75     *ListHead = State;
  76     return;
  77 }
  78
  79
  80 /*******************************************************************************
  81  *
  82  * FUNCTION:    AcpiUtPopGenericState
  83  *
  84  * PARAMETERS:  ListHead            - Head of the state stack
  85  *
  86  * RETURN:      The popped state object
  87  *
  88  * DESCRIPTION: Pop a state object from a state stack
  89  *
  90  ******************************************************************************/
  91
  92 ACPI_GENERIC_STATE *
  93 AcpiUtPopGenericState (
  94     ACPI_GENERIC_STATE      **ListHead)
  95 {
  96     ACPI_GENERIC_STATE      *State;
  97
  98
  99     ACPI_FUNCTION_ENTRY ();
 100
 101
 102     /* Remove the state object at the head of the list (stack) */
 103
 104     State = *ListHead;
 105     if (State)
 106     {
 107         /* Update the list head */
 108
 109         *ListHead = State->Common.Next;
 110     }
 111
 112     return (State);
 113 }
 114
 115
 116 /*******************************************************************************
 117  *
 118  * FUNCTION:    AcpiUtCreateGenericState
 119  *
 120  * PARAMETERS:  None
 121  *
 122  * RETURN:      The new state object. NULL on failure.
 123  *
 124  * DESCRIPTION: Create a generic state object. Attempt to obtain one from
 125  *              the global state cache;  If none available, create a new one.
 126  *
 127  ******************************************************************************/
 128
 129 ACPI_GENERIC_STATE *
 130 AcpiUtCreateGenericState (
 131     void)
 132 {
 133     ACPI_GENERIC_STATE      *State;
 134
 135
 136     ACPI_FUNCTION_ENTRY ();
 137
 138
 139     State = AcpiOsAcquireObject (AcpiGbl_StateCache);
 140     if (State)
 141     {
 142         /* Initialize */
 143         State->Common.DescriptorType = ACPI_DESC_TYPE_STATE;
 144     }
 145
 146     return (State);
 147 }
 148
 149
 150 /*******************************************************************************
 151  *
 152  * FUNCTION:    AcpiUtCreateThreadState
 153  *
 154  * PARAMETERS:  None
 155  *
 156  * RETURN:      New Thread State. NULL on failure
 157  *
 158  * DESCRIPTION: Create a "Thread State" - a flavor of the generic state used
 159  *              to track per-thread info during method execution
 160  *
 161  ******************************************************************************/
 162
 163 ACPI_THREAD_STATE *
 164 AcpiUtCreateThreadState (
 165     void)
 166 {
 167     ACPI_GENERIC_STATE      *State;
 168
 169
 170     ACPI_FUNCTION_ENTRY ();
 171
 172
 173     /* Create the generic state object */
 174
 175     State = AcpiUtCreateGenericState ();
 176     if (!State)
 177     {
 178         return (NULL);
 179     }
 180
 181     /* Init fields specific to the update struct */
 182
 183     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_THREAD;
 184     State->Thread.ThreadId = AcpiOsGetThreadId ();
 185
 186     /* Check for invalid thread ID - zero is very bad, it will break things */
 187
 188     if (!State->Thread.ThreadId)
 189     {
 190         ACPI_ERROR ((AE_INFO, "Invalid zero ID from AcpiOsGetThreadId"));
 191         State->Thread.ThreadId = (ACPI_THREAD_ID) 1;
 192     }
 193
 194     return ((ACPI_THREAD_STATE *) State);
 195 }
 196
 197
 198 /*******************************************************************************
 199  *
 200  * FUNCTION:    AcpiUtCreateUpdateState
 201  *
 202  * PARAMETERS:  Object          - Initial Object to be installed in the state
 203  *              Action          - Update action to be performed
 204  *
 205  * RETURN:      New state object, null on failure
 206  *
 207  * DESCRIPTION: Create an "Update State" - a flavor of the generic state used
 208  *              to update reference counts and delete complex objects such
 209  *              as packages.
 210  *
 211  ******************************************************************************/
 212
 213 ACPI_GENERIC_STATE *
 214 AcpiUtCreateUpdateState (
 215     ACPI_OPERAND_OBJECT     *Object,
 216     UINT16                  Action)
 217 {
 218     ACPI_GENERIC_STATE      *State;
 219
 220
 221     ACPI_FUNCTION_ENTRY ();
 222
 223
 224     /* Create the generic state object */
 225
 226     State = AcpiUtCreateGenericState ();
 227     if (!State)
 228     {
 229         return (NULL);
 230     }
 231
 232     /* Init fields specific to the update struct */
 233
 234     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_UPDATE;
 235     State->Update.Object = Object;
 236     State->Update.Value = Action;
 237     return (State);
 238 }
 239
 240
 241 /*******************************************************************************
 242  *
 243  * FUNCTION:    AcpiUtCreatePkgState
 244  *
 245  * PARAMETERS:  Object          - Initial Object to be installed in the state
 246  *              Action          - Update action to be performed
 247  *
 248  * RETURN:      New state object, null on failure
 249  *
 250  * DESCRIPTION: Create a "Package State"
 251  *
 252  ******************************************************************************/
 253
 254 ACPI_GENERIC_STATE *
 255 AcpiUtCreatePkgState (
 256     void                    *InternalObject,
 257     void                    *ExternalObject,
 258     UINT32                  Index)
 259 {
 260     ACPI_GENERIC_STATE      *State;
 261
 262
 263     ACPI_FUNCTION_ENTRY ();
 264
 265
 266     /* Create the generic state object */
 267
 268     State = AcpiUtCreateGenericState ();
 269     if (!State)
 270     {
 271         return (NULL);
 272     }
 273
 274     /* Init fields specific to the update struct */
 275
 276     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_PACKAGE;
 277     State->Pkg.SourceObject = (ACPI_OPERAND_OBJECT *) InternalObject;
 278     State->Pkg.DestObject = ExternalObject;
 279     State->Pkg.Index= Index;
 280     State->Pkg.NumPackages = 1;
 281
 282     return (State);
 283 }
 284
 285
 286 /*******************************************************************************
 287  *
 288  * FUNCTION:    AcpiUtCreateControlState
 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 ACPI_GENERIC_STATE *
 300 AcpiUtCreateControlState (
 301     void)
 302 {
 303     ACPI_GENERIC_STATE      *State;
 304
 305
 306     ACPI_FUNCTION_ENTRY ();
 307
 308
 309     /* Create the generic state object */
 310
 311     State = AcpiUtCreateGenericState ();
 312     if (!State)
 313     {
 314         return (NULL);
 315     }
 316
 317     /* Init fields specific to the control struct */
 318
 319     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_CONTROL;
 320     State->Common.State = ACPI_CONTROL_CONDITIONAL_EXECUTING;
 321
 322     return (State);
 323 }
 324
 325
 326 /*******************************************************************************
 327  *
 328  * FUNCTION:    AcpiUtDeleteGenericState
 329  *
 330  * PARAMETERS:  State               - The state object to be deleted
 331  *
 332  * RETURN:      None
 333  *
 334  * DESCRIPTION: Release a state object to the state cache. NULL state objects
 335  *              are ignored.
 336  *
 337  ******************************************************************************/
 338
 339 void
 340 AcpiUtDeleteGenericState (
 341     ACPI_GENERIC_STATE      *State)
 342 {
 343     ACPI_FUNCTION_ENTRY ();
 344
 345
 346     /* Ignore null state */
 347
 348     if (State)
 349     {
 350         (void) AcpiOsReleaseObject (AcpiGbl_StateCache, State);
 351     }
 352
 353     return;
 354 }