reactos/drivers/bus/acpi/acpica/executer/exfield.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
   4  *
   5  *****************************************************************************/
   6
   7 /******************************************************************************
   8  *
   9  * 1. Copyright Notice
  10  *
  11  * Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.
  12  * All rights reserved.
  13  *
  14  * 2. License
  15  *
  16  * 2.1. This is your license from Intel Corp. under its intellectual property
  17  * rights.  You may have additional license terms from the party that provided
  18  * you this software, covering your right to use that party's intellectual
  19  * property rights.
  20  *
  21  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  22  * copy of the source code appearing in this file ("Covered Code") an
  23  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  24  * base code distributed originally by Intel ("Original Intel Code") to copy,
  25  * make derivatives, distribute, use and display any portion of the Covered
  26  * Code in any form, with the right to sublicense such rights; and
  27  *
  28  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  29  * license (with the right to sublicense), under only those claims of Intel
  30  * patents that are infringed by the Original Intel Code, to make, use, sell,
  31  * offer to sell, and import the Covered Code and derivative works thereof
  32  * solely to the minimum extent necessary to exercise the above copyright
  33  * license, and in no event shall the patent license extend to any additions
  34  * to or modifications of the Original Intel Code.  No other license or right
  35  * is granted directly or by implication, estoppel or otherwise;
  36  *
  37  * The above copyright and patent license is granted only if the following
  38  * conditions are met:
  39  *
  40  * 3. Conditions
  41  *
  42  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  43  * Redistribution of source code of any substantial portion of the Covered
  44  * Code or modification with rights to further distribute source must include
  45  * the above Copyright Notice, the above License, this list of Conditions,
  46  * and the following Disclaimer and Export Compliance provision.  In addition,
  47  * Licensee must cause all Covered Code to which Licensee contributes to
  48  * contain a file documenting the changes Licensee made to create that Covered
  49  * Code and the date of any change.  Licensee must include in that file the
  50  * documentation of any changes made by any predecessor Licensee.  Licensee
  51  * must include a prominent statement that the modification is derived,
  52  * directly or indirectly, from Original Intel Code.
  53  *
  54  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  55  * Redistribution of source code of any substantial portion of the Covered
  56  * Code or modification without rights to further distribute source must
  57  * include the following Disclaimer and Export Compliance provision in the
  58  * documentation and/or other materials provided with distribution.  In
  59  * addition, Licensee may not authorize further sublicense of source of any
  60  * portion of the Covered Code, and must include terms to the effect that the
  61  * license from Licensee to its licensee is limited to the intellectual
  62  * property embodied in the software Licensee provides to its licensee, and
  63  * not to intellectual property embodied in modifications its licensee may
  64  * make.
  65  *
  66  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  67  * substantial portion of the Covered Code or modification must reproduce the
  68  * above Copyright Notice, and the following Disclaimer and Export Compliance
  69  * provision in the documentation and/or other materials provided with the
  70  * distribution.
  71  *
  72  * 3.4. Intel retains all right, title, and interest in and to the Original
  73  * Intel Code.
  74  *
  75  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  76  * Intel shall be used in advertising or otherwise to promote the sale, use or
  77  * other dealings in products derived from or relating to the Covered Code
  78  * without prior written authorization from Intel.
  79  *
  80  * 4. Disclaimer and Export Compliance
  81  *
  82  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  83  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  84  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  85  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  86  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  87  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  88  * PARTICULAR PURPOSE.
  89  *
  90  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  91  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  92  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  93  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  94  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  95  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  96  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  97  * LIMITED REMEDY.
  98  *
  99  * 4.3. Licensee shall not export, either directly or indirectly, any of this
 100  * software or system incorporating such software without first obtaining any
 101  * required license or other approval from the U. S. Department of Commerce or
 102  * any other agency or department of the United States Government.  In the
 103  * event Licensee exports any such software from the United States or
 104  * re-exports any such software from a foreign destination, Licensee shall
 105  * ensure that the distribution and export/re-export of the software is in
 106  * compliance with all laws, regulations, orders, or other restrictions of the
 107  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 108  * any of its subsidiaries will export/re-export any technical data, process,
 109  * software, or service, directly or indirectly, to any country for which the
 110  * United States government or any agency thereof requires an export license,
 111  * other governmental approval, or letter of assurance, without first obtaining
 112  * such license, approval or letter.
 113  *
 114  *****************************************************************************/
 115
 116
 117 #define __EXFIELD_C__
 118
 119 #include "acpi.h"
 120 #include "accommon.h"
 121 #include "acdispat.h"
 122 #include "acinterp.h"
 123
 124
 125 #define _COMPONENT          ACPI_EXECUTER
 126         ACPI_MODULE_NAME    ("exfield")
 127
 128
 129 /*******************************************************************************
 130  *
 131  * FUNCTION:    AcpiExReadDataFromField
 132  *
 133  * PARAMETERS:  WalkState           - Current execution state
 134  *              ObjDesc             - The named field
 135  *              RetBufferDesc       - Where the return data object is stored
 136  *
 137  * RETURN:      Status
 138  *
 139  * DESCRIPTION: Read from a named field.  Returns either an Integer or a
 140  *              Buffer, depending on the size of the field.
 141  *
 142  ******************************************************************************/
 143
 144 ACPI_STATUS
 145 AcpiExReadDataFromField (
 146     ACPI_WALK_STATE         *WalkState,
 147     ACPI_OPERAND_OBJECT     *ObjDesc,
 148     ACPI_OPERAND_OBJECT     **RetBufferDesc)
 149 {
 150     ACPI_STATUS             Status;
 151     ACPI_OPERAND_OBJECT     *BufferDesc;
 152     ACPI_SIZE               Length;
 153     void                    *Buffer;
 154     UINT32                  Function;
 155
 156
 157     ACPI_FUNCTION_TRACE_PTR (ExReadDataFromField, ObjDesc);
 158
 159
 160     /* Parameter validation */
 161
 162     if (!ObjDesc)
 163     {
 164         return_ACPI_STATUS (AE_AML_NO_OPERAND);
 165     }
 166     if (!RetBufferDesc)
 167     {
 168         return_ACPI_STATUS (AE_BAD_PARAMETER);
 169     }
 170
 171     if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
 172     {
 173         /*
 174          * If the BufferField arguments have not been previously evaluated,
 175          * evaluate them now and save the results.
 176          */
 177         if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
 178         {
 179             Status = AcpiDsGetBufferFieldArguments (ObjDesc);
 180             if (ACPI_FAILURE (Status))
 181             {
 182                 return_ACPI_STATUS (Status);
 183             }
 184         }
 185     }
 186     else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
 187              (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
 188               ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
 189     {
 190         /*
 191          * This is an SMBus or IPMI read. We must create a buffer to hold
 192          * the data and then directly access the region handler.
 193          *
 194          * Note: Smbus protocol value is passed in upper 16-bits of Function
 195          */
 196         if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS)
 197         {
 198             Length = ACPI_SMBUS_BUFFER_SIZE;
 199             Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
 200         }
 201         else /* IPMI */
 202         {
 203             Length = ACPI_IPMI_BUFFER_SIZE;
 204             Function = ACPI_READ;
 205         }
 206
 207         BufferDesc = AcpiUtCreateBufferObject (Length);
 208         if (!BufferDesc)
 209         {
 210             return_ACPI_STATUS (AE_NO_MEMORY);
 211         }
 212
 213         /* Lock entire transaction if requested */
 214
 215         AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
 216
 217         /* Call the region handler for the read */
 218
 219         Status = AcpiExAccessRegion (ObjDesc, 0,
 220                     ACPI_CAST_PTR (UINT64, BufferDesc->Buffer.Pointer),
 221                     Function);
 222         AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
 223         goto Exit;
 224     }
 225
 226     /*
 227      * Allocate a buffer for the contents of the field.
 228      *
 229      * If the field is larger than the current integer width, create
 230      * a BUFFER to hold it.  Otherwise, use an INTEGER.  This allows
 231      * the use of arithmetic operators on the returned value if the
 232      * field size is equal or smaller than an Integer.
 233      *
 234      * Note: Field.length is in bits.
 235      */
 236     Length = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->Field.BitLength);
 237     if (Length > AcpiGbl_IntegerByteWidth)
 238     {
 239         /* Field is too large for an Integer, create a Buffer instead */
 240
 241         BufferDesc = AcpiUtCreateBufferObject (Length);
 242         if (!BufferDesc)
 243         {
 244             return_ACPI_STATUS (AE_NO_MEMORY);
 245         }
 246         Buffer = BufferDesc->Buffer.Pointer;
 247     }
 248     else
 249     {
 250         /* Field will fit within an Integer (normal case) */
 251
 252         BufferDesc = AcpiUtCreateIntegerObject ((UINT64) 0);
 253         if (!BufferDesc)
 254         {
 255             return_ACPI_STATUS (AE_NO_MEMORY);
 256         }
 257
 258         Length = AcpiGbl_IntegerByteWidth;
 259         Buffer = &BufferDesc->Integer.Value;
 260     }
 261
 262     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
 263         "FieldRead [TO]:   Obj %p, Type %X, Buf %p, ByteLen %X\n",
 264         ObjDesc, ObjDesc->Common.Type, Buffer, (UINT32) Length));
 265     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
 266         "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
 267         ObjDesc->CommonField.BitLength,
 268         ObjDesc->CommonField.StartFieldBitOffset,
 269         ObjDesc->CommonField.BaseByteOffset));
 270
 271     /* Lock entire transaction if requested */
 272
 273     AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
 274
 275     /* Read from the field */
 276
 277     Status = AcpiExExtractFromField (ObjDesc, Buffer, (UINT32) Length);
 278     AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
 279
 280
 281 Exit:
 282     if (ACPI_FAILURE (Status))
 283     {
 284         AcpiUtRemoveReference (BufferDesc);
 285     }
 286     else
 287     {
 288         *RetBufferDesc = BufferDesc;
 289     }
 290
 291     return_ACPI_STATUS (Status);
 292 }
 293
 294
 295 /*******************************************************************************
 296  *
 297  * FUNCTION:    AcpiExWriteDataToField
 298  *
 299  * PARAMETERS:  SourceDesc          - Contains data to write
 300  *              ObjDesc             - The named field
 301  *              ResultDesc          - Where the return value is returned, if any
 302  *
 303  * RETURN:      Status
 304  *
 305  * DESCRIPTION: Write to a named field
 306  *
 307  ******************************************************************************/
 308
 309 ACPI_STATUS
 310 AcpiExWriteDataToField (
 311     ACPI_OPERAND_OBJECT     *SourceDesc,
 312     ACPI_OPERAND_OBJECT     *ObjDesc,
 313     ACPI_OPERAND_OBJECT     **ResultDesc)
 314 {
 315     ACPI_STATUS             Status;
 316     UINT32                  Length;
 317     void                    *Buffer;
 318     ACPI_OPERAND_OBJECT     *BufferDesc;
 319     UINT32                  Function;
 320
 321
 322     ACPI_FUNCTION_TRACE_PTR (ExWriteDataToField, ObjDesc);
 323
 324
 325     /* Parameter validation */
 326
 327     if (!SourceDesc || !ObjDesc)
 328     {
 329         return_ACPI_STATUS (AE_AML_NO_OPERAND);
 330     }
 331
 332     if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
 333     {
 334         /*
 335          * If the BufferField arguments have not been previously evaluated,
 336          * evaluate them now and save the results.
 337          */
 338         if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
 339         {
 340             Status = AcpiDsGetBufferFieldArguments (ObjDesc);
 341             if (ACPI_FAILURE (Status))
 342             {
 343                 return_ACPI_STATUS (Status);
 344             }
 345         }
 346     }
 347     else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
 348              (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
 349               ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
 350     {
 351         /*
 352          * This is an SMBus or IPMI write. We will bypass the entire field
 353          * mechanism and handoff the buffer directly to the handler. For
 354          * these address spaces, the buffer is bi-directional; on a write,
 355          * return data is returned in the same buffer.
 356          *
 357          * Source must be a buffer of sufficient size:
 358          * ACPI_SMBUS_BUFFER_SIZE or ACPI_IPMI_BUFFER_SIZE.
 359          *
 360          * Note: SMBus protocol type is passed in upper 16-bits of Function
 361          */
 362         if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
 363         {
 364             ACPI_ERROR ((AE_INFO,
 365                 "SMBus or IPMI write requires Buffer, found type %s",
 366                 AcpiUtGetObjectTypeName (SourceDesc)));
 367
 368             return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 369         }
 370
 371         if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS)
 372         {
 373             Length = ACPI_SMBUS_BUFFER_SIZE;
 374             Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
 375         }
 376         else /* IPMI */
 377         {
 378             Length = ACPI_IPMI_BUFFER_SIZE;
 379             Function = ACPI_WRITE;
 380         }
 381
 382         if (SourceDesc->Buffer.Length < Length)
 383         {
 384             ACPI_ERROR ((AE_INFO,
 385                 "SMBus or IPMI write requires Buffer of length %u, found length %u",
 386                 Length, SourceDesc->Buffer.Length));
 387
 388             return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
 389         }
 390
 391         /* Create the bi-directional buffer */
 392
 393         BufferDesc = AcpiUtCreateBufferObject (Length);
 394         if (!BufferDesc)
 395         {
 396             return_ACPI_STATUS (AE_NO_MEMORY);
 397         }
 398
 399         Buffer = BufferDesc->Buffer.Pointer;
 400         ACPI_MEMCPY (Buffer, SourceDesc->Buffer.Pointer, Length);
 401
 402         /* Lock entire transaction if requested */
 403
 404         AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
 405
 406         /*
 407          * Perform the write (returns status and perhaps data in the
 408          * same buffer)
 409          */
 410         Status = AcpiExAccessRegion (ObjDesc, 0,
 411                     (UINT64 *) Buffer, Function);
 412         AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
 413
 414         *ResultDesc = BufferDesc;
 415         return_ACPI_STATUS (Status);
 416     }
 417
 418     /* Get a pointer to the data to be written */
 419
 420     switch (SourceDesc->Common.Type)
 421     {
 422     case ACPI_TYPE_INTEGER:
 423         Buffer = &SourceDesc->Integer.Value;
 424         Length = sizeof (SourceDesc->Integer.Value);
 425         break;
 426
 427     case ACPI_TYPE_BUFFER:
 428         Buffer = SourceDesc->Buffer.Pointer;
 429         Length = SourceDesc->Buffer.Length;
 430         break;
 431
 432     case ACPI_TYPE_STRING:
 433         Buffer = SourceDesc->String.Pointer;
 434         Length = SourceDesc->String.Length;
 435         break;
 436
 437     default:
 438         return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 439     }
 440
 441     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
 442         "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
 443         SourceDesc, AcpiUtGetTypeName (SourceDesc->Common.Type),
 444         SourceDesc->Common.Type, Buffer, Length));
 445
 446     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
 447         "FieldWrite [TO]:   Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
 448         ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type),
 449         ObjDesc->Common.Type,
 450         ObjDesc->CommonField.BitLength,
 451         ObjDesc->CommonField.StartFieldBitOffset,
 452         ObjDesc->CommonField.BaseByteOffset));
 453
 454     /* Lock entire transaction if requested */
 455
 456     AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
 457
 458     /* Write to the field */
 459
 460     Status = AcpiExInsertIntoField (ObjDesc, Buffer, Length);
 461     AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
 462
 463     return_ACPI_STATUS (Status);
 464 }
 465
 466