drivers/bus/acpi/executer/amstorob.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: amstorob - AML Interpreter object store support, store to object
   5  *              $Revision$
   6  *
   7  *****************************************************************************/
   8
   9 /*
  10  *  Copyright (C) 2000, 2001 R. Byron Moore
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  */
  26
  27
  28 #include "acpi.h"
  29 #include "acparser.h"
  30 #include "acdispat.h"
  31 #include "acinterp.h"
  32 #include "amlcode.h"
  33 #include "acnamesp.h"
  34 #include "actables.h"
  35
  36
  37 #define _COMPONENT          ACPI_EXECUTER
  38          MODULE_NAME         ("amstorob")
  39
  40
  41 /*******************************************************************************
  42  *
  43  * FUNCTION:    Acpi_aml_copy_buffer_to_buffer
  44  *
  45  * PARAMETERS:  Source_desc         - Source object to copy
  46  *              Target_desc         - Destination object of the copy
  47  *
  48  * RETURN:      Status
  49  *
  50  * DESCRIPTION: Copy a buffer object to another buffer object.
  51  *
  52  ******************************************************************************/
  53
  54 ACPI_STATUS
  55 acpi_aml_copy_buffer_to_buffer (
  56         ACPI_OPERAND_OBJECT     *source_desc,
  57         ACPI_OPERAND_OBJECT     *target_desc)
  58 {
  59         u32                     length;
  60         u8                      *buffer;
  61
  62
  63         /*
  64          * We know that Source_desc is a buffer by now
  65          */
  66         buffer = (u8 *) source_desc->buffer.pointer;
  67         length = source_desc->buffer.length;
  68
  69         /*
  70          * If target is a buffer of length zero, allocate a new
  71          * buffer of the proper length
  72          */
  73         if (target_desc->buffer.length == 0) {
  74                 target_desc->buffer.pointer = acpi_cm_allocate (length);
  75                 if (!target_desc->buffer.pointer) {
  76                         return (AE_NO_MEMORY);
  77                 }
  78
  79                 target_desc->buffer.length = length;
  80         }
  81
  82         /*
  83          * Buffer is a static allocation,
  84          * only place what will fit in the buffer.
  85          */
  86         if (length <= target_desc->buffer.length) {
  87                 /* Clear existing buffer and copy in the new one */
  88
  89                 MEMSET(target_desc->buffer.pointer, 0, target_desc->buffer.length);
  90                 MEMCPY(target_desc->buffer.pointer, buffer, length);
  91         }
  92
  93         else {
  94                 /*
  95                  * Truncate the source, copy only what will fit
  96                  */
  97                 MEMCPY(target_desc->buffer.pointer, buffer, target_desc->buffer.length);
  98
  99         }
 100
 101         return (AE_OK);
 102 }
 103
 104
 105 /*******************************************************************************
 106  *
 107  * FUNCTION:    Acpi_aml_copy_string_to_string
 108  *
 109  * PARAMETERS:  Source_desc         - Source object to copy
 110  *              Target_desc         - Destination object of the copy
 111  *
 112  * RETURN:      Status
 113  *
 114  * DESCRIPTION: Copy a String object to another String object
 115  *
 116  ******************************************************************************/
 117
 118 ACPI_STATUS
 119 acpi_aml_copy_string_to_string (
 120         ACPI_OPERAND_OBJECT     *source_desc,
 121         ACPI_OPERAND_OBJECT     *target_desc)
 122 {
 123         u32                     length;
 124         u8                      *buffer;
 125
 126
 127         /*
 128          * We know that Source_desc is a string by now.
 129          */
 130         buffer = (u8 *) source_desc->string.pointer;
 131         length = source_desc->string.length;
 132
 133         /*
 134          * Setting a string value replaces the old string
 135          */
 136         if (length < target_desc->string.length) {
 137                 /* Clear old string and copy in the new one */
 138
 139                 MEMSET(target_desc->string.pointer, 0, target_desc->string.length);
 140                 MEMCPY(target_desc->string.pointer, buffer, length);
 141         }
 142
 143         else {
 144                 /*
 145                  * Free the current buffer, then allocate a buffer
 146                  * large enough to hold the value
 147                  */
 148                 if (target_desc->string.pointer &&
 149                         !acpi_tb_system_table_pointer (target_desc->string.pointer)) {
 150                         /*
 151                          * Only free if not a pointer into the DSDT
 152                          */
 153                         acpi_cm_free(target_desc->string.pointer);
 154                 }
 155
 156                 target_desc->string.pointer = acpi_cm_allocate (length + 1);
 157                 if (!target_desc->string.pointer) {
 158                         return (AE_NO_MEMORY);
 159                 }
 160                 target_desc->string.length = length;
 161
 162
 163                 MEMCPY(target_desc->string.pointer, buffer, length);
 164         }
 165
 166         return (AE_OK);
 167 }
 168
 169
 170 /*******************************************************************************
 171  *
 172  * FUNCTION:    Acpi_aml_copy_integer_to_index_field
 173  *
 174  * PARAMETERS:  Source_desc         - Source object to copy
 175  *              Target_desc         - Destination object of the copy
 176  *
 177  * RETURN:      Status
 178  *
 179  * DESCRIPTION: Write an Integer to an Index Field
 180  *
 181  ******************************************************************************/
 182
 183 ACPI_STATUS
 184 acpi_aml_copy_integer_to_index_field (
 185         ACPI_OPERAND_OBJECT     *source_desc,
 186         ACPI_OPERAND_OBJECT     *target_desc)
 187 {
 188         ACPI_STATUS             status;
 189         u8                      locked;
 190
 191
 192         /*
 193          * Get the global lock if needed
 194          */
 195         locked = acpi_aml_acquire_global_lock (target_desc->index_field.lock_rule);
 196
 197         /*
 198          * Set Index value to select proper Data register
 199          * perform the update (Set index)
 200          */
 201         status = acpi_aml_access_named_field (ACPI_WRITE,
 202                          target_desc->index_field.index,
 203                          &target_desc->index_field.value,
 204                          sizeof (target_desc->index_field.value));
 205         if (ACPI_SUCCESS (status)) {
 206                 /* Set_index was successful, next set Data value */
 207
 208                 status = acpi_aml_access_named_field (ACPI_WRITE,
 209                                    target_desc->index_field.data,
 210                                    &source_desc->integer.value,
 211                                    sizeof (source_desc->integer.value));
 212
 213         }
 214
 215
 216
 217         /*
 218          * Release global lock if we acquired it earlier
 219          */
 220         acpi_aml_release_global_lock (locked);
 221
 222         return (status);
 223 }
 224
 225
 226 /*******************************************************************************
 227  *
 228  * FUNCTION:    Acpi_aml_copy_integer_to_bank_field
 229  *
 230  * PARAMETERS:  Source_desc         - Source object to copy
 231  *              Target_desc         - Destination object of the copy
 232  *
 233  * RETURN:      Status
 234  *
 235  * DESCRIPTION: Write an Integer to a Bank Field
 236  *
 237  ******************************************************************************/
 238
 239 ACPI_STATUS
 240 acpi_aml_copy_integer_to_bank_field (
 241         ACPI_OPERAND_OBJECT     *source_desc,
 242         ACPI_OPERAND_OBJECT     *target_desc)
 243 {
 244         ACPI_STATUS             status;
 245         u8                      locked;
 246
 247
 248         /*
 249          * Get the global lock if needed
 250          */
 251         locked = acpi_aml_acquire_global_lock (target_desc->index_field.lock_rule);
 252
 253
 254         /*
 255          * Set Bank value to select proper Bank
 256          * Perform the update (Set Bank Select)
 257          */
 258
 259         status = acpi_aml_access_named_field (ACPI_WRITE,
 260                          target_desc->bank_field.bank_select,
 261                          &target_desc->bank_field.value,
 262                          sizeof (target_desc->bank_field.value));
 263         if (ACPI_SUCCESS (status)) {
 264                 /* Set bank select successful, set data value  */
 265
 266                 status = acpi_aml_access_named_field (ACPI_WRITE,
 267                                    target_desc->bank_field.bank_select,
 268                                    &source_desc->bank_field.value,
 269                                    sizeof (source_desc->bank_field.value));
 270         }
 271
 272
 273
 274         /*
 275          * Release global lock if we acquired it earlier
 276          */
 277         acpi_aml_release_global_lock (locked);
 278
 279         return (status);
 280 }
 281
 282
 283 /*******************************************************************************
 284  *
 285  * FUNCTION:    Acpi_aml_copy_data_to_named_field
 286  *
 287  * PARAMETERS:  Source_desc         - Source object to copy
 288  *              Node                - Destination Namespace node
 289  *
 290  * RETURN:      Status
 291  *
 292  * DESCRIPTION: Copy raw data to a Named Field.  No implicit conversion
 293  *              is performed on the source object
 294  *
 295  ******************************************************************************/
 296
 297 ACPI_STATUS
 298 acpi_aml_copy_data_to_named_field (
 299         ACPI_OPERAND_OBJECT     *source_desc,
 300         ACPI_NAMESPACE_NODE     *node)
 301 {
 302         ACPI_STATUS             status;
 303         u8                      locked;
 304         u32                     length;
 305         u8                      *buffer;
 306
 307
 308         /*
 309          * Named fields (Create_xxx_field) - We don't perform any conversions on the
 310          * source operand, just use the raw data
 311          */
 312         switch (source_desc->common.type) {
 313         case ACPI_TYPE_INTEGER:
 314                 buffer = (u8 *) &source_desc->integer.value;
 315                 length = sizeof (source_desc->integer.value);
 316                 break;
 317
 318         case ACPI_TYPE_BUFFER:
 319                 buffer = (u8 *) source_desc->buffer.pointer;
 320                 length = source_desc->buffer.length;
 321                 break;
 322
 323         case ACPI_TYPE_STRING:
 324                 buffer = (u8 *) source_desc->string.pointer;
 325                 length = source_desc->string.length;
 326                 break;
 327
 328         default:
 329                 return (AE_TYPE);
 330         }
 331
 332         /*
 333          * Get the global lock if needed before the update
 334          * TBD: not needed!
 335          */
 336         locked = acpi_aml_acquire_global_lock (source_desc->field.lock_rule);
 337
 338         status = acpi_aml_access_named_field (ACPI_WRITE,
 339                           node, buffer, length);
 340
 341         acpi_aml_release_global_lock (locked);
 342
 343         return (status);
 344 }
 345
 346
 347 /*******************************************************************************
 348  *
 349  * FUNCTION:    Acpi_aml_copy_integer_to_field_unit
 350  *
 351  * PARAMETERS:  Source_desc         - Source object to copy
 352  *              Target_desc         - Destination object of the copy
 353  *
 354  * RETURN:      Status
 355  *
 356  * DESCRIPTION: Write an Integer to a Field Unit.
 357  *
 358  ******************************************************************************/
 359
 360 ACPI_STATUS
 361 acpi_aml_copy_integer_to_field_unit (
 362         ACPI_OPERAND_OBJECT     *source_desc,
 363         ACPI_OPERAND_OBJECT     *target_desc)
 364 {
 365         ACPI_STATUS             status = AE_OK;
 366         u8                      *location = NULL;
 367         u32                     mask;
 368         u32                     new_value;
 369         u8                      locked = FALSE;
 370
 371
 372         /*
 373          * If the Field Buffer and Index have not been previously evaluated,
 374          * evaluate them and save the results.
 375          */
 376         if (!(target_desc->common.flags & AOPOBJ_DATA_VALID)) {
 377                 status = acpi_ds_get_field_unit_arguments (target_desc);
 378                 if (ACPI_FAILURE (status)) {
 379                         return (status);
 380                 }
 381         }
 382
 383         if ((!target_desc->field_unit.container ||
 384                 ACPI_TYPE_BUFFER != target_desc->field_unit.container->common.type)) {
 385                 return (AE_AML_INTERNAL);
 386         }
 387
 388         /*
 389          * Get the global lock if needed
 390          */
 391         locked = acpi_aml_acquire_global_lock (target_desc->field_unit.lock_rule);
 392
 393         /*
 394          * TBD: [Unhandled] REMOVE this limitation
 395          * Make sure the operation is within the limits of our implementation
 396          * this is not a Spec limitation!!
 397          */
 398         if (target_desc->field_unit.length + target_desc->field_unit.bit_offset > 32) {
 399                 return (AE_NOT_IMPLEMENTED);
 400         }
 401
 402         /* Field location is (base of buffer) + (byte offset) */
 403
 404         location = target_desc->field_unit.container->buffer.pointer
 405                           + target_desc->field_unit.offset;
 406
 407         /*
 408          * Construct Mask with 1 bits where the field is,
 409          * 0 bits elsewhere
 410          */
 411         mask = ((u32) 1 << target_desc->field_unit.length) - ((u32)1
 412                            << target_desc->field_unit.bit_offset);
 413
 414         /* Zero out the field in the buffer */
 415
 416         MOVE_UNALIGNED32_TO_32 (&new_value, location);
 417         new_value &= ~mask;
 418
 419         /*
 420          * Shift and mask the new value into position,
 421          * and or it into the buffer.
 422          */
 423         new_value |= (source_desc->integer.value << target_desc->field_unit.bit_offset) &
 424                          mask;
 425
 426         /* Store back the value */
 427
 428         MOVE_UNALIGNED32_TO_32 (location, &new_value);
 429
 430         return (AE_OK);
 431 }
 432
 433