arch/all-pc/acpica/source/compiler/dtsubtable.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dtsubtable.c - handling of subtables within ACPI tables
   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 #define __DTSUBTABLE_C__
  45
  46 #include "aslcompiler.h"
  47 #include "dtcompiler.h"
  48
  49 #define _COMPONENT          DT_COMPILER
  50         ACPI_MODULE_NAME    ("dtsubtable")
  51
  52
  53 /******************************************************************************
  54  *
  55  * FUNCTION:    DtCreateSubtable
  56  *
  57  * PARAMETERS:  Buffer              - Input buffer
  58  *              Length              - Buffer length
  59  *              RetSubtable         - Returned newly created subtable
  60  *
  61  * RETURN:      None
  62  *
  63  * DESCRIPTION: Create a subtable that is not listed with ACPI_DMTABLE_INFO
  64  *              For example, FACS has 24 bytes reserved at the end
  65  *              and it's not listed at AcpiDmTableInfoFacs
  66  *
  67  *****************************************************************************/
  68
  69 void
  70 DtCreateSubtable (
  71     UINT8                   *Buffer,
  72     UINT32                  Length,
  73     DT_SUBTABLE             **RetSubtable)
  74 {
  75     DT_SUBTABLE             *Subtable;
  76
  77
  78     Subtable = UtLocalCalloc (sizeof (DT_SUBTABLE));
  79
  80     /* Create a new buffer for the subtable data */
  81
  82     Subtable->Buffer = UtLocalCalloc (Length);
  83     ACPI_MEMCPY (Subtable->Buffer, Buffer, Length);
  84
  85     Subtable->Length = Length;
  86     Subtable->TotalLength = Length;
  87
  88     *RetSubtable = Subtable;
  89 }
  90
  91
  92 /******************************************************************************
  93  *
  94  * FUNCTION:    DtInsertSubtable
  95  *
  96  * PARAMETERS:  ParentTable         - The Parent of the new subtable
  97  *              Subtable            - The new subtable to insert
  98  *
  99  * RETURN:      None
 100  *
 101  * DESCRIPTION: Insert the new subtable to the parent table
 102  *
 103  *****************************************************************************/
 104
 105 void
 106 DtInsertSubtable (
 107     DT_SUBTABLE             *ParentTable,
 108     DT_SUBTABLE             *Subtable)
 109 {
 110     DT_SUBTABLE             *ChildTable;
 111
 112
 113     Subtable->Peer = NULL;
 114     Subtable->Parent = ParentTable;
 115     Subtable->Depth = ParentTable->Depth + 1;
 116
 117     /* Link the new entry into the child list */
 118
 119     if (!ParentTable->Child)
 120     {
 121         ParentTable->Child = Subtable;
 122     }
 123     else
 124     {
 125         /* Walk to the end of the child list */
 126
 127         ChildTable = ParentTable->Child;
 128         while (ChildTable->Peer)
 129         {
 130             ChildTable = ChildTable->Peer;
 131         }
 132
 133         /* Add new subtable at the end of the child list */
 134
 135         ChildTable->Peer = Subtable;
 136     }
 137 }
 138
 139
 140 /******************************************************************************
 141  *
 142  * FUNCTION:    DtPushSubtable
 143  *
 144  * PARAMETERS:  Subtable            - Subtable to push
 145  *
 146  * RETURN:      None
 147  *
 148  * DESCRIPTION: Push a subtable onto a subtable stack
 149  *
 150  *****************************************************************************/
 151
 152 void
 153 DtPushSubtable (
 154     DT_SUBTABLE             *Subtable)
 155 {
 156
 157     Subtable->StackTop = Gbl_SubtableStack;
 158     Gbl_SubtableStack = Subtable;
 159 }
 160
 161
 162 /******************************************************************************
 163  *
 164  * FUNCTION:    DtPopSubtable
 165  *
 166  * PARAMETERS:  None
 167  *
 168  * RETURN:      None
 169  *
 170  * DESCRIPTION: Pop a subtable from a subtable stack. Uses global SubtableStack
 171  *
 172  *****************************************************************************/
 173
 174 void
 175 DtPopSubtable (
 176     void)
 177 {
 178     DT_SUBTABLE             *Subtable;
 179
 180
 181     Subtable = Gbl_SubtableStack;
 182
 183     if (Subtable)
 184     {
 185         Gbl_SubtableStack = Subtable->StackTop;
 186     }
 187 }
 188
 189
 190 /******************************************************************************
 191  *
 192  * FUNCTION:    DtPeekSubtable
 193  *
 194  * PARAMETERS:  None
 195  *
 196  * RETURN:      The subtable on top of stack
 197  *
 198  * DESCRIPTION: Get the subtable on top of stack
 199  *
 200  *****************************************************************************/
 201
 202 DT_SUBTABLE *
 203 DtPeekSubtable (
 204     void)
 205 {
 206
 207     return (Gbl_SubtableStack);
 208 }
 209
 210
 211 /******************************************************************************
 212  *
 213  * FUNCTION:    DtGetNextSubtable
 214  *
 215  * PARAMETERS:  ParentTable         - Parent table whose children we are
 216  *                                    getting
 217  *              ChildTable          - Previous child that was found.
 218  *                                    The NEXT child will be returned
 219  *
 220  * RETURN:      Pointer to the NEXT child or NULL if none is found.
 221  *
 222  * DESCRIPTION: Return the next peer subtable within the tree.
 223  *
 224  *****************************************************************************/
 225
 226 DT_SUBTABLE *
 227 DtGetNextSubtable (
 228     DT_SUBTABLE             *ParentTable,
 229     DT_SUBTABLE             *ChildTable)
 230 {
 231     ACPI_FUNCTION_ENTRY ();
 232
 233
 234     if (!ChildTable)
 235     {
 236         /* It's really the parent's _scope_ that we want */
 237
 238         return (ParentTable->Child);
 239     }
 240
 241     /* Otherwise just return the next peer (NULL if at end-of-list) */
 242
 243     return (ChildTable->Peer);
 244 }
 245
 246
 247 /******************************************************************************
 248  *
 249  * FUNCTION:    DtGetParentSubtable
 250  *
 251  * PARAMETERS:  Subtable            - Current subtable
 252  *
 253  * RETURN:      Parent of the given subtable
 254  *
 255  * DESCRIPTION: Get the parent of the given subtable in the tree
 256  *
 257  *****************************************************************************/
 258
 259 DT_SUBTABLE *
 260 DtGetParentSubtable (
 261     DT_SUBTABLE             *Subtable)
 262 {
 263
 264     if (!Subtable)
 265     {
 266         return (NULL);
 267     }
 268
 269     return (Subtable->Parent);
 270 }
 271
 272
 273 /******************************************************************************
 274  *
 275  * FUNCTION:    DtGetSubtableLength
 276  *
 277  * PARAMETERS:  Field               - Current field list pointer
 278  *              Info                - Data table info
 279  *
 280  * RETURN:      Subtable length
 281  *
 282  * DESCRIPTION: Get length of bytes needed to compile the subtable
 283  *
 284  *****************************************************************************/
 285
 286 UINT32
 287 DtGetSubtableLength (
 288     DT_FIELD                *Field,
 289     ACPI_DMTABLE_INFO       *Info)
 290 {
 291     UINT32                  ByteLength = 0;
 292     UINT8                   Step;
 293     UINT8                   i;
 294
 295
 296     /* Walk entire Info table; Null name terminates */
 297
 298     for (; Info->Name; Info++)
 299     {
 300         if (Info->Opcode == ACPI_DMT_EXTRA_TEXT)
 301         {
 302             continue;
 303         }
 304
 305         if (!Field)
 306         {
 307             goto Error;
 308         }
 309
 310         ByteLength += DtGetFieldLength (Field, Info);
 311
 312         switch (Info->Opcode)
 313         {
 314         case ACPI_DMT_GAS:
 315
 316             Step = 5;
 317             break;
 318
 319         case ACPI_DMT_HESTNTFY:
 320
 321             Step = 9;
 322             break;
 323
 324         default:
 325
 326             Step = 1;
 327             break;
 328         }
 329
 330         for (i = 0; i < Step; i++)
 331         {
 332             if (!Field)
 333             {
 334                 goto Error;
 335             }
 336
 337             Field = Field->Next;
 338         }
 339     }
 340
 341     return (ByteLength);
 342
 343 Error:
 344     if (!Field)
 345     {
 346         sprintf (MsgBuffer, "Found NULL field - Field name \"%s\" needed",
 347             Info->Name);
 348         DtFatal (ASL_MSG_COMPILER_INTERNAL, NULL, MsgBuffer);
 349     }
 350
 351     return (ASL_EOF);
 352 }
 353
 354
 355 /******************************************************************************
 356  *
 357  * FUNCTION:    DtSetSubtableLength
 358  *
 359  * PARAMETERS:  Subtable            - Subtable
 360  *
 361  * RETURN:      None
 362  *
 363  * DESCRIPTION: Set length of the subtable into its length field
 364  *
 365  *****************************************************************************/
 366
 367 void
 368 DtSetSubtableLength (
 369     DT_SUBTABLE             *Subtable)
 370 {
 371
 372     if (!Subtable->LengthField)
 373     {
 374         return;
 375     }
 376
 377     ACPI_MEMCPY (Subtable->LengthField, &Subtable->TotalLength,
 378         Subtable->SizeOfLengthField);
 379 }