sys/contrib/dev/acpica/source/include/acobject.h

   1 /******************************************************************************
   2  *
   3  * Name: acobject.h - Definition of ACPI_OPERAND_OBJECT  (Internal object only)
   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 #ifndef _ACOBJECT_H
  45 #define _ACOBJECT_H
  46
  47 /* acpisrc:StructDefs -- for acpisrc conversion */
  48
  49
  50 /*
  51  * The ACPI_OPERAND_OBJECT is used to pass AML operands from the dispatcher
  52  * to the interpreter, and to keep track of the various handlers such as
  53  * address space handlers and notify handlers. The object is a constant
  54  * size in order to allow it to be cached and reused.
  55  *
  56  * Note: The object is optimized to be aligned and will not work if it is
  57  * byte-packed.
  58  */
  59 #if ACPI_MACHINE_WIDTH == 64
  60 #pragma pack(8)
  61 #else
  62 #pragma pack(4)
  63 #endif
  64
  65 /*******************************************************************************
  66  *
  67  * Common Descriptors
  68  *
  69  ******************************************************************************/
  70
  71 /*
  72  * Common area for all objects.
  73  *
  74  * DescriptorType is used to differentiate between internal descriptors, and
  75  * must be in the same place across all descriptors
  76  *
  77  * Note: The DescriptorType and Type fields must appear in the identical
  78  * position in both the ACPI_NAMESPACE_NODE and ACPI_OPERAND_OBJECT
  79  * structures.
  80  */
  81 #define ACPI_OBJECT_COMMON_HEADER \
  82     union acpi_operand_object       *NextObject;        /* Objects linked to parent NS node */\
  83     UINT8                           DescriptorType;     /* To differentiate various internal objs */\
  84     UINT8                           Type;               /* ACPI_OBJECT_TYPE */\
  85     UINT16                          ReferenceCount;     /* For object deletion management */\
  86     UINT8                           Flags;
  87     /*
  88      * Note: There are 3 bytes available here before the
  89      * next natural alignment boundary (for both 32/64 cases)
  90      */
  91
  92 /* Values for Flag byte above */
  93
  94 #define AOPOBJ_AML_CONSTANT         0x01    /* Integer is an AML constant */
  95 #define AOPOBJ_STATIC_POINTER       0x02    /* Data is part of an ACPI table, don't delete */
  96 #define AOPOBJ_DATA_VALID           0x04    /* Object is initialized and data is valid */
  97 #define AOPOBJ_OBJECT_INITIALIZED   0x08    /* Region is initialized, _REG was run */
  98 #define AOPOBJ_SETUP_COMPLETE       0x10    /* Region setup is complete */
  99 #define AOPOBJ_INVALID              0x20    /* Host OS won't allow a Region address */
 100
 101
 102 /******************************************************************************
 103  *
 104  * Basic data types
 105  *
 106  *****************************************************************************/
 107
 108 typedef struct acpi_object_common
 109 {
 110     ACPI_OBJECT_COMMON_HEADER
 111
 112 } ACPI_OBJECT_COMMON;
 113
 114
 115 typedef struct acpi_object_integer
 116 {
 117     ACPI_OBJECT_COMMON_HEADER
 118     UINT8                           Fill[3];            /* Prevent warning on some compilers */
 119     UINT64                          Value;
 120
 121 } ACPI_OBJECT_INTEGER;
 122
 123
 124 /*
 125  * Note: The String and Buffer object must be identical through the
 126  * pointer and length elements. There is code that depends on this.
 127  *
 128  * Fields common to both Strings and Buffers
 129  */
 130 #define ACPI_COMMON_BUFFER_INFO(_Type) \
 131     _Type                           *Pointer; \
 132     UINT32                          Length;
 133
 134
 135 typedef struct acpi_object_string   /* Null terminated, ASCII characters only */
 136 {
 137     ACPI_OBJECT_COMMON_HEADER
 138     ACPI_COMMON_BUFFER_INFO         (char)              /* String in AML stream or allocated string */
 139
 140 } ACPI_OBJECT_STRING;
 141
 142
 143 typedef struct acpi_object_buffer
 144 {
 145     ACPI_OBJECT_COMMON_HEADER
 146     ACPI_COMMON_BUFFER_INFO         (UINT8)             /* Buffer in AML stream or allocated buffer */
 147     UINT32                          AmlLength;
 148     UINT8                           *AmlStart;
 149     ACPI_NAMESPACE_NODE             *Node;              /* Link back to parent node */
 150
 151 } ACPI_OBJECT_BUFFER;
 152
 153
 154 typedef struct acpi_object_package
 155 {
 156     ACPI_OBJECT_COMMON_HEADER
 157     ACPI_NAMESPACE_NODE             *Node;              /* Link back to parent node */
 158     union acpi_operand_object       **Elements;         /* Array of pointers to AcpiObjects */
 159     UINT8                           *AmlStart;
 160     UINT32                          AmlLength;
 161     UINT32                          Count;              /* # of elements in package */
 162
 163 } ACPI_OBJECT_PACKAGE;
 164
 165
 166 /******************************************************************************
 167  *
 168  * Complex data types
 169  *
 170  *****************************************************************************/
 171
 172 typedef struct acpi_object_event
 173 {
 174     ACPI_OBJECT_COMMON_HEADER
 175     ACPI_SEMAPHORE                  OsSemaphore;        /* Actual OS synchronization object */
 176
 177 } ACPI_OBJECT_EVENT;
 178
 179
 180 typedef struct acpi_object_mutex
 181 {
 182     ACPI_OBJECT_COMMON_HEADER
 183     UINT8                           SyncLevel;          /* 0-15, specified in Mutex() call */
 184     UINT16                          AcquisitionDepth;   /* Allow multiple Acquires, same thread */
 185     ACPI_MUTEX                      OsMutex;            /* Actual OS synchronization object */
 186     ACPI_THREAD_ID                  ThreadId;           /* Current owner of the mutex */
 187     struct acpi_thread_state        *OwnerThread;       /* Current owner of the mutex */
 188     union acpi_operand_object       *Prev;              /* Link for list of acquired mutexes */
 189     union acpi_operand_object       *Next;              /* Link for list of acquired mutexes */
 190     ACPI_NAMESPACE_NODE             *Node;              /* Containing namespace node */
 191     UINT8                           OriginalSyncLevel;  /* Owner's original sync level (0-15) */
 192
 193 } ACPI_OBJECT_MUTEX;
 194
 195
 196 typedef struct acpi_object_region
 197 {
 198     ACPI_OBJECT_COMMON_HEADER
 199     UINT8                           SpaceId;
 200     ACPI_NAMESPACE_NODE             *Node;              /* Containing namespace node */
 201     union acpi_operand_object       *Handler;           /* Handler for region access */
 202     union acpi_operand_object       *Next;
 203     ACPI_PHYSICAL_ADDRESS           Address;
 204     UINT32                          Length;
 205
 206 } ACPI_OBJECT_REGION;
 207
 208
 209 typedef struct acpi_object_method
 210 {
 211     ACPI_OBJECT_COMMON_HEADER
 212     UINT8                           InfoFlags;
 213     UINT8                           ParamCount;
 214     UINT8                           SyncLevel;
 215     union acpi_operand_object       *Mutex;
 216     UINT8                           *AmlStart;
 217     union
 218     {
 219         ACPI_INTERNAL_METHOD            Implementation;
 220         union acpi_operand_object       *Handler;
 221     } Dispatch;
 222
 223     UINT32                          AmlLength;
 224     UINT8                           ThreadCount;
 225     ACPI_OWNER_ID                   OwnerId;
 226
 227 } ACPI_OBJECT_METHOD;
 228
 229 /* Flags for InfoFlags field above */
 230
 231 #define ACPI_METHOD_MODULE_LEVEL        0x01    /* Method is actually module-level code */
 232 #define ACPI_METHOD_INTERNAL_ONLY       0x02    /* Method is implemented internally (_OSI) */
 233 #define ACPI_METHOD_SERIALIZED          0x04    /* Method is serialized */
 234 #define ACPI_METHOD_SERIALIZED_PENDING  0x08    /* Method is to be marked serialized */
 235 #define ACPI_METHOD_IGNORE_SYNC_LEVEL   0x10    /* Method was auto-serialized at table load time */
 236 #define ACPI_METHOD_MODIFIED_NAMESPACE  0x20    /* Method modified the namespace */
 237
 238
 239 /******************************************************************************
 240  *
 241  * Objects that can be notified. All share a common NotifyInfo area.
 242  *
 243  *****************************************************************************/
 244
 245 /*
 246  * Common fields for objects that support ASL notifications
 247  */
 248 #define ACPI_COMMON_NOTIFY_INFO \
 249     union acpi_operand_object       *NotifyList[2];     /* Handlers for system/device notifies */\
 250     union acpi_operand_object       *Handler;           /* Handler for Address space */
 251
 252
 253 typedef struct acpi_object_notify_common    /* COMMON NOTIFY for POWER, PROCESSOR, DEVICE, and THERMAL */
 254 {
 255     ACPI_OBJECT_COMMON_HEADER
 256     ACPI_COMMON_NOTIFY_INFO
 257
 258 } ACPI_OBJECT_NOTIFY_COMMON;
 259
 260
 261 typedef struct acpi_object_device
 262 {
 263     ACPI_OBJECT_COMMON_HEADER
 264     ACPI_COMMON_NOTIFY_INFO
 265     ACPI_GPE_BLOCK_INFO             *GpeBlock;
 266
 267 } ACPI_OBJECT_DEVICE;
 268
 269
 270 typedef struct acpi_object_power_resource
 271 {
 272     ACPI_OBJECT_COMMON_HEADER
 273     ACPI_COMMON_NOTIFY_INFO
 274     UINT32                          SystemLevel;
 275     UINT32                          ResourceOrder;
 276
 277 } ACPI_OBJECT_POWER_RESOURCE;
 278
 279
 280 typedef struct acpi_object_processor
 281 {
 282     ACPI_OBJECT_COMMON_HEADER
 283
 284     /* The next two fields take advantage of the 3-byte space before NOTIFY_INFO */
 285
 286     UINT8                           ProcId;
 287     UINT8                           Length;
 288     ACPI_COMMON_NOTIFY_INFO
 289     ACPI_IO_ADDRESS                 Address;
 290
 291 } ACPI_OBJECT_PROCESSOR;
 292
 293
 294 typedef struct acpi_object_thermal_zone
 295 {
 296     ACPI_OBJECT_COMMON_HEADER
 297     ACPI_COMMON_NOTIFY_INFO
 298
 299 } ACPI_OBJECT_THERMAL_ZONE;
 300
 301
 302 /******************************************************************************
 303  *
 304  * Fields. All share a common header/info field.
 305  *
 306  *****************************************************************************/
 307
 308 /*
 309  * Common bitfield for the field objects
 310  * "Field Datum"  -- a datum from the actual field object
 311  * "Buffer Datum" -- a datum from a user buffer, read from or to be written to the field
 312  */
 313 #define ACPI_COMMON_FIELD_INFO \
 314     UINT8                           FieldFlags;         /* Access, update, and lock bits */\
 315     UINT8                           Attribute;          /* From AccessAs keyword */\
 316     UINT8                           AccessByteWidth;    /* Read/Write size in bytes */\
 317     ACPI_NAMESPACE_NODE             *Node;              /* Link back to parent node */\
 318     UINT32                          BitLength;          /* Length of field in bits */\
 319     UINT32                          BaseByteOffset;     /* Byte offset within containing object */\
 320     UINT32                          Value;              /* Value to store into the Bank or Index register */\
 321     UINT8                           StartFieldBitOffset;/* Bit offset within first field datum (0-63) */\
 322     UINT8                           AccessLength;       /* For serial regions/fields */
 323
 324
 325 typedef struct acpi_object_field_common                 /* COMMON FIELD (for BUFFER, REGION, BANK, and INDEX fields) */
 326 {
 327     ACPI_OBJECT_COMMON_HEADER
 328     ACPI_COMMON_FIELD_INFO
 329     union acpi_operand_object       *RegionObj;         /* Parent Operation Region object (REGION/BANK fields only) */
 330
 331 } ACPI_OBJECT_FIELD_COMMON;
 332
 333
 334 typedef struct acpi_object_region_field
 335 {
 336     ACPI_OBJECT_COMMON_HEADER
 337     ACPI_COMMON_FIELD_INFO
 338     UINT16                          ResourceLength;
 339     union acpi_operand_object       *RegionObj;         /* Containing OpRegion object */
 340     UINT8                           *ResourceBuffer;    /* ResourceTemplate for serial regions/fields */
 341     UINT16                          PinNumberIndex;     /* Index relative to previous Connection/Template */
 342
 343 } ACPI_OBJECT_REGION_FIELD;
 344
 345
 346 typedef struct acpi_object_bank_field
 347 {
 348     ACPI_OBJECT_COMMON_HEADER
 349     ACPI_COMMON_FIELD_INFO
 350     union acpi_operand_object       *RegionObj;         /* Containing OpRegion object */
 351     union acpi_operand_object       *BankObj;           /* BankSelect Register object */
 352
 353 } ACPI_OBJECT_BANK_FIELD;
 354
 355
 356 typedef struct acpi_object_index_field
 357 {
 358     ACPI_OBJECT_COMMON_HEADER
 359     ACPI_COMMON_FIELD_INFO
 360
 361     /*
 362      * No "RegionObj" pointer needed since the Index and Data registers
 363      * are each field definitions unto themselves.
 364      */
 365     union acpi_operand_object       *IndexObj;          /* Index register */
 366     union acpi_operand_object       *DataObj;           /* Data register */
 367
 368 } ACPI_OBJECT_INDEX_FIELD;
 369
 370
 371 /* The BufferField is different in that it is part of a Buffer, not an OpRegion */
 372
 373 typedef struct acpi_object_buffer_field
 374 {
 375     ACPI_OBJECT_COMMON_HEADER
 376     ACPI_COMMON_FIELD_INFO
 377     union acpi_operand_object       *BufferObj;         /* Containing Buffer object */
 378
 379 } ACPI_OBJECT_BUFFER_FIELD;
 380
 381
 382 /******************************************************************************
 383  *
 384  * Objects for handlers
 385  *
 386  *****************************************************************************/
 387
 388 typedef struct acpi_object_notify_handler
 389 {
 390     ACPI_OBJECT_COMMON_HEADER
 391     ACPI_NAMESPACE_NODE             *Node;              /* Parent device */
 392     UINT32                          HandlerType;        /* Type: Device/System/Both */
 393     ACPI_NOTIFY_HANDLER             Handler;            /* Handler address */
 394     void                            *Context;
 395     union acpi_operand_object       *Next[2];           /* Device and System handler lists */
 396
 397 } ACPI_OBJECT_NOTIFY_HANDLER;
 398
 399
 400 typedef struct acpi_object_addr_handler
 401 {
 402     ACPI_OBJECT_COMMON_HEADER
 403     UINT8                           SpaceId;
 404     UINT8                           HandlerFlags;
 405     ACPI_ADR_SPACE_HANDLER          Handler;
 406     ACPI_NAMESPACE_NODE             *Node;              /* Parent device */
 407     void                            *Context;
 408     ACPI_ADR_SPACE_SETUP            Setup;
 409     union acpi_operand_object       *RegionList;        /* Regions using this handler */
 410     union acpi_operand_object       *Next;
 411
 412 } ACPI_OBJECT_ADDR_HANDLER;
 413
 414 /* Flags for address handler (HandlerFlags) */
 415
 416 #define ACPI_ADDR_HANDLER_DEFAULT_INSTALLED  0x01
 417
 418
 419 /******************************************************************************
 420  *
 421  * Special internal objects
 422  *
 423  *****************************************************************************/
 424
 425 /*
 426  * The Reference object is used for these opcodes:
 427  * Arg[0-6], Local[0-7], IndexOp, NameOp, RefOfOp, LoadOp, LoadTableOp, DebugOp
 428  * The Reference.Class differentiates these types.
 429  */
 430 typedef struct acpi_object_reference
 431 {
 432     ACPI_OBJECT_COMMON_HEADER
 433     UINT8                           Class;              /* Reference Class */
 434     UINT8                           TargetType;         /* Used for Index Op */
 435     UINT8                           Reserved;
 436     void                            *Object;            /* NameOp=>HANDLE to obj, IndexOp=>ACPI_OPERAND_OBJECT */
 437     ACPI_NAMESPACE_NODE             *Node;              /* RefOf or Namepath */
 438     union acpi_operand_object       **Where;            /* Target of Index */
 439     UINT8                           *IndexPointer;      /* Used for Buffers and Strings */
 440     UINT32                          Value;              /* Used for Local/Arg/Index/DdbHandle */
 441
 442 } ACPI_OBJECT_REFERENCE;
 443
 444 /* Values for Reference.Class above */
 445
 446 typedef enum
 447 {
 448     ACPI_REFCLASS_LOCAL             = 0,        /* Method local */
 449     ACPI_REFCLASS_ARG               = 1,        /* Method argument */
 450     ACPI_REFCLASS_REFOF             = 2,        /* Result of RefOf() TBD: Split to Ref/Node and Ref/OperandObj? */
 451     ACPI_REFCLASS_INDEX             = 3,        /* Result of Index() */
 452     ACPI_REFCLASS_TABLE             = 4,        /* DdbHandle - Load(), LoadTable() */
 453     ACPI_REFCLASS_NAME              = 5,        /* Reference to a named object */
 454     ACPI_REFCLASS_DEBUG             = 6,        /* Debug object */
 455
 456     ACPI_REFCLASS_MAX               = 6
 457
 458 } ACPI_REFERENCE_CLASSES;
 459
 460
 461 /*
 462  * Extra object is used as additional storage for types that
 463  * have AML code in their declarations (TermArgs) that must be
 464  * evaluated at run time.
 465  *
 466  * Currently: Region and FieldUnit types
 467  */
 468 typedef struct acpi_object_extra
 469 {
 470     ACPI_OBJECT_COMMON_HEADER
 471     ACPI_NAMESPACE_NODE             *Method_REG;        /* _REG method for this region (if any) */
 472     ACPI_NAMESPACE_NODE             *ScopeNode;
 473     void                            *RegionContext;     /* Region-specific data */
 474     UINT8                           *AmlStart;
 475     UINT32                          AmlLength;
 476
 477 } ACPI_OBJECT_EXTRA;
 478
 479
 480 /* Additional data that can be attached to namespace nodes */
 481
 482 typedef struct acpi_object_data
 483 {
 484     ACPI_OBJECT_COMMON_HEADER
 485     ACPI_OBJECT_HANDLER             Handler;
 486     void                            *Pointer;
 487
 488 } ACPI_OBJECT_DATA;
 489
 490
 491 /* Structure used when objects are cached for reuse */
 492
 493 typedef struct acpi_object_cache_list
 494 {
 495     ACPI_OBJECT_COMMON_HEADER
 496     union acpi_operand_object       *Next;              /* Link for object cache and internal lists*/
 497
 498 } ACPI_OBJECT_CACHE_LIST;
 499
 500
 501 /******************************************************************************
 502  *
 503  * ACPI_OPERAND_OBJECT Descriptor - a giant union of all of the above
 504  *
 505  *****************************************************************************/
 506
 507 typedef union acpi_operand_object
 508 {
 509     ACPI_OBJECT_COMMON                  Common;
 510     ACPI_OBJECT_INTEGER                 Integer;
 511     ACPI_OBJECT_STRING                  String;
 512     ACPI_OBJECT_BUFFER                  Buffer;
 513     ACPI_OBJECT_PACKAGE                 Package;
 514     ACPI_OBJECT_EVENT                   Event;
 515     ACPI_OBJECT_METHOD                  Method;
 516     ACPI_OBJECT_MUTEX                   Mutex;
 517     ACPI_OBJECT_REGION                  Region;
 518     ACPI_OBJECT_NOTIFY_COMMON           CommonNotify;
 519     ACPI_OBJECT_DEVICE                  Device;
 520     ACPI_OBJECT_POWER_RESOURCE          PowerResource;
 521     ACPI_OBJECT_PROCESSOR               Processor;
 522     ACPI_OBJECT_THERMAL_ZONE            ThermalZone;
 523     ACPI_OBJECT_FIELD_COMMON            CommonField;
 524     ACPI_OBJECT_REGION_FIELD            Field;
 525     ACPI_OBJECT_BUFFER_FIELD            BufferField;
 526     ACPI_OBJECT_BANK_FIELD              BankField;
 527     ACPI_OBJECT_INDEX_FIELD             IndexField;
 528     ACPI_OBJECT_NOTIFY_HANDLER          Notify;
 529     ACPI_OBJECT_ADDR_HANDLER            AddressSpace;
 530     ACPI_OBJECT_REFERENCE               Reference;
 531     ACPI_OBJECT_EXTRA                   Extra;
 532     ACPI_OBJECT_DATA                    Data;
 533     ACPI_OBJECT_CACHE_LIST              Cache;
 534
 535     /*
 536      * Add namespace node to union in order to simplify code that accepts both
 537      * ACPI_OPERAND_OBJECTs and ACPI_NAMESPACE_NODEs. The structures share
 538      * a common DescriptorType field in order to differentiate them.
 539      */
 540     ACPI_NAMESPACE_NODE                 Node;
 541
 542 } ACPI_OPERAND_OBJECT;
 543
 544
 545 /******************************************************************************
 546  *
 547  * ACPI_DESCRIPTOR - objects that share a common descriptor identifier
 548  *
 549  *****************************************************************************/
 550
 551 /* Object descriptor types */
 552
 553 #define ACPI_DESC_TYPE_CACHED           0x01        /* Used only when object is cached */
 554 #define ACPI_DESC_TYPE_STATE            0x02
 555 #define ACPI_DESC_TYPE_STATE_UPDATE     0x03
 556 #define ACPI_DESC_TYPE_STATE_PACKAGE    0x04
 557 #define ACPI_DESC_TYPE_STATE_CONTROL    0x05
 558 #define ACPI_DESC_TYPE_STATE_RPSCOPE    0x06
 559 #define ACPI_DESC_TYPE_STATE_PSCOPE     0x07
 560 #define ACPI_DESC_TYPE_STATE_WSCOPE     0x08
 561 #define ACPI_DESC_TYPE_STATE_RESULT     0x09
 562 #define ACPI_DESC_TYPE_STATE_NOTIFY     0x0A
 563 #define ACPI_DESC_TYPE_STATE_THREAD     0x0B
 564 #define ACPI_DESC_TYPE_WALK             0x0C
 565 #define ACPI_DESC_TYPE_PARSER           0x0D
 566 #define ACPI_DESC_TYPE_OPERAND          0x0E
 567 #define ACPI_DESC_TYPE_NAMED            0x0F
 568 #define ACPI_DESC_TYPE_MAX              0x0F
 569
 570
 571 typedef struct acpi_common_descriptor
 572 {
 573     void                            *CommonPointer;
 574     UINT8                           DescriptorType; /* To differentiate various internal objs */
 575
 576 } ACPI_COMMON_DESCRIPTOR;
 577
 578 typedef union acpi_descriptor
 579 {
 580     ACPI_COMMON_DESCRIPTOR          Common;
 581     ACPI_OPERAND_OBJECT             Object;
 582     ACPI_NAMESPACE_NODE             Node;
 583     ACPI_PARSE_OBJECT               Op;
 584
 585 } ACPI_DESCRIPTOR;
 586
 587 #pragma pack()
 588
 589 #endif /* _ACOBJECT_H */