drivers/acpi/acpica/nsconvert.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsconvert - Object conversions for objects returned by
   4  *                          predefined methods
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2016, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acnamesp.h"
  48 #include "acinterp.h"
  49 #include "acpredef.h"
  50 #include "amlresrc.h"
  51
  52 #define _COMPONENT          ACPI_NAMESPACE
  53 ACPI_MODULE_NAME("nsconvert")
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ns_convert_to_integer
  58  *
  59  * PARAMETERS:  original_object     - Object to be converted
  60  *              return_object       - Where the new converted object is returned
  61  *
  62  * RETURN:      Status. AE_OK if conversion was successful.
  63  *
  64  * DESCRIPTION: Attempt to convert a String/Buffer object to an Integer.
  65  *
  66  ******************************************************************************/
  67 acpi_status
  68 acpi_ns_convert_to_integer(union acpi_operand_object *original_object,
  69                            union acpi_operand_object **return_object)
  70 {
  71         union acpi_operand_object *new_object;
  72         acpi_status status;
  73         u64 value = 0;
  74         u32 i;
  75
  76         switch (original_object->common.type) {
  77         case ACPI_TYPE_STRING:
  78
  79                 /* String-to-Integer conversion */
  80
  81                 status = acpi_ut_strtoul64(original_object->string.pointer,
  82                                            acpi_gbl_integer_byte_width, &value);
  83                 if (ACPI_FAILURE(status)) {
  84                         return (status);
  85                 }
  86                 break;
  87
  88         case ACPI_TYPE_BUFFER:
  89
  90                 /* Buffer-to-Integer conversion. Max buffer size is 64 bits. */
  91
  92                 if (original_object->buffer.length > 8) {
  93                         return (AE_AML_OPERAND_TYPE);
  94                 }
  95
  96                 /* Extract each buffer byte to create the integer */
  97
  98                 for (i = 0; i < original_object->buffer.length; i++) {
  99                         value |= ((u64)
 100                                   original_object->buffer.pointer[i] << (i *
 101                                                                          8));
 102                 }
 103                 break;
 104
 105         default:
 106
 107                 return (AE_AML_OPERAND_TYPE);
 108         }
 109
 110         new_object = acpi_ut_create_integer_object(value);
 111         if (!new_object) {
 112                 return (AE_NO_MEMORY);
 113         }
 114
 115         *return_object = new_object;
 116         return (AE_OK);
 117 }
 118
 119 /*******************************************************************************
 120  *
 121  * FUNCTION:    acpi_ns_convert_to_string
 122  *
 123  * PARAMETERS:  original_object     - Object to be converted
 124  *              return_object       - Where the new converted object is returned
 125  *
 126  * RETURN:      Status. AE_OK if conversion was successful.
 127  *
 128  * DESCRIPTION: Attempt to convert a Integer/Buffer object to a String.
 129  *
 130  ******************************************************************************/
 131
 132 acpi_status
 133 acpi_ns_convert_to_string(union acpi_operand_object *original_object,
 134                           union acpi_operand_object **return_object)
 135 {
 136         union acpi_operand_object *new_object;
 137         acpi_size length;
 138         acpi_status status;
 139
 140         switch (original_object->common.type) {
 141         case ACPI_TYPE_INTEGER:
 142                 /*
 143                  * Integer-to-String conversion. Commonly, convert
 144                  * an integer of value 0 to a NULL string. The last element of
 145                  * _BIF and _BIX packages occasionally need this fix.
 146                  */
 147                 if (original_object->integer.value == 0) {
 148
 149                         /* Allocate a new NULL string object */
 150
 151                         new_object = acpi_ut_create_string_object(0);
 152                         if (!new_object) {
 153                                 return (AE_NO_MEMORY);
 154                         }
 155                 } else {
 156                         status = acpi_ex_convert_to_string(original_object,
 157                                                            &new_object,
 158                                                            ACPI_IMPLICIT_CONVERT_HEX);
 159                         if (ACPI_FAILURE(status)) {
 160                                 return (status);
 161                         }
 162                 }
 163                 break;
 164
 165         case ACPI_TYPE_BUFFER:
 166                 /*
 167                  * Buffer-to-String conversion. Use a to_string
 168                  * conversion, no transform performed on the buffer data. The best
 169                  * example of this is the _BIF method, where the string data from
 170                  * the battery is often (incorrectly) returned as buffer object(s).
 171                  */
 172                 length = 0;
 173                 while ((length < original_object->buffer.length) &&
 174                        (original_object->buffer.pointer[length])) {
 175                         length++;
 176                 }
 177
 178                 /* Allocate a new string object */
 179
 180                 new_object = acpi_ut_create_string_object(length);
 181                 if (!new_object) {
 182                         return (AE_NO_MEMORY);
 183                 }
 184
 185                 /*
 186                  * Copy the raw buffer data with no transform. String is already NULL
 187                  * terminated at Length+1.
 188                  */
 189                 memcpy(new_object->string.pointer,
 190                        original_object->buffer.pointer, length);
 191                 break;
 192
 193         default:
 194
 195                 return (AE_AML_OPERAND_TYPE);
 196         }
 197
 198         *return_object = new_object;
 199         return (AE_OK);
 200 }
 201
 202 /*******************************************************************************
 203  *
 204  * FUNCTION:    acpi_ns_convert_to_buffer
 205  *
 206  * PARAMETERS:  original_object     - Object to be converted
 207  *              return_object       - Where the new converted object is returned
 208  *
 209  * RETURN:      Status. AE_OK if conversion was successful.
 210  *
 211  * DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.
 212  *
 213  ******************************************************************************/
 214
 215 acpi_status
 216 acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
 217                           union acpi_operand_object **return_object)
 218 {
 219         union acpi_operand_object *new_object;
 220         acpi_status status;
 221         union acpi_operand_object **elements;
 222         u32 *dword_buffer;
 223         u32 count;
 224         u32 i;
 225
 226         switch (original_object->common.type) {
 227         case ACPI_TYPE_INTEGER:
 228                 /*
 229                  * Integer-to-Buffer conversion.
 230                  * Convert the Integer to a packed-byte buffer. _MAT and other
 231                  * objects need this sometimes, if a read has been performed on a
 232                  * Field object that is less than or equal to the global integer
 233                  * size (32 or 64 bits).
 234                  */
 235                 status =
 236                     acpi_ex_convert_to_buffer(original_object, &new_object);
 237                 if (ACPI_FAILURE(status)) {
 238                         return (status);
 239                 }
 240                 break;
 241
 242         case ACPI_TYPE_STRING:
 243
 244                 /* String-to-Buffer conversion. Simple data copy */
 245
 246                 new_object = acpi_ut_create_buffer_object
 247                     (original_object->string.length);
 248                 if (!new_object) {
 249                         return (AE_NO_MEMORY);
 250                 }
 251
 252                 memcpy(new_object->buffer.pointer,
 253                        original_object->string.pointer,
 254                        original_object->string.length);
 255                 break;
 256
 257         case ACPI_TYPE_PACKAGE:
 258                 /*
 259                  * This case is often seen for predefined names that must return a
 260                  * Buffer object with multiple DWORD integers within. For example,
 261                  * _FDE and _GTM. The Package can be converted to a Buffer.
 262                  */
 263
 264                 /* All elements of the Package must be integers */
 265
 266                 elements = original_object->package.elements;
 267                 count = original_object->package.count;
 268
 269                 for (i = 0; i < count; i++) {
 270                         if ((!*elements) ||
 271                             ((*elements)->common.type != ACPI_TYPE_INTEGER)) {
 272                                 return (AE_AML_OPERAND_TYPE);
 273                         }
 274                         elements++;
 275                 }
 276
 277                 /* Create the new buffer object to replace the Package */
 278
 279                 new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count));
 280                 if (!new_object) {
 281                         return (AE_NO_MEMORY);
 282                 }
 283
 284                 /* Copy the package elements (integers) to the buffer as DWORDs */
 285
 286                 elements = original_object->package.elements;
 287                 dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer);
 288
 289                 for (i = 0; i < count; i++) {
 290                         *dword_buffer = (u32)(*elements)->integer.value;
 291                         dword_buffer++;
 292                         elements++;
 293                 }
 294                 break;
 295
 296         default:
 297
 298                 return (AE_AML_OPERAND_TYPE);
 299         }
 300
 301         *return_object = new_object;
 302         return (AE_OK);
 303 }
 304
 305 /*******************************************************************************
 306  *
 307  * FUNCTION:    acpi_ns_convert_to_unicode
 308  *
 309  * PARAMETERS:  scope               - Namespace node for the method/object
 310  *              original_object     - ASCII String Object to be converted
 311  *              return_object       - Where the new converted object is returned
 312  *
 313  * RETURN:      Status. AE_OK if conversion was successful.
 314  *
 315  * DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer.
 316  *
 317  ******************************************************************************/
 318
 319 acpi_status
 320 acpi_ns_convert_to_unicode(struct acpi_namespace_node *scope,
 321                            union acpi_operand_object *original_object,
 322                            union acpi_operand_object **return_object)
 323 {
 324         union acpi_operand_object *new_object;
 325         char *ascii_string;
 326         u16 *unicode_buffer;
 327         u32 unicode_length;
 328         u32 i;
 329
 330         if (!original_object) {
 331                 return (AE_OK);
 332         }
 333
 334         /* If a Buffer was returned, it must be at least two bytes long */
 335
 336         if (original_object->common.type == ACPI_TYPE_BUFFER) {
 337                 if (original_object->buffer.length < 2) {
 338                         return (AE_AML_OPERAND_VALUE);
 339                 }
 340
 341                 *return_object = NULL;
 342                 return (AE_OK);
 343         }
 344
 345         /*
 346          * The original object is an ASCII string. Convert this string to
 347          * a unicode buffer.
 348          */
 349         ascii_string = original_object->string.pointer;
 350         unicode_length = (original_object->string.length * 2) + 2;
 351
 352         /* Create a new buffer object for the Unicode data */
 353
 354         new_object = acpi_ut_create_buffer_object(unicode_length);
 355         if (!new_object) {
 356                 return (AE_NO_MEMORY);
 357         }
 358
 359         unicode_buffer = ACPI_CAST_PTR(u16, new_object->buffer.pointer);
 360
 361         /* Convert ASCII to Unicode */
 362
 363         for (i = 0; i < original_object->string.length; i++) {
 364                 unicode_buffer[i] = (u16)ascii_string[i];
 365         }
 366
 367         *return_object = new_object;
 368         return (AE_OK);
 369 }
 370
 371 /*******************************************************************************
 372  *
 373  * FUNCTION:    acpi_ns_convert_to_resource
 374  *
 375  * PARAMETERS:  scope               - Namespace node for the method/object
 376  *              original_object     - Object to be converted
 377  *              return_object       - Where the new converted object is returned
 378  *
 379  * RETURN:      Status. AE_OK if conversion was successful
 380  *
 381  * DESCRIPTION: Attempt to convert a Integer object to a resource_template
 382  *              Buffer.
 383  *
 384  ******************************************************************************/
 385
 386 acpi_status
 387 acpi_ns_convert_to_resource(struct acpi_namespace_node *scope,
 388                             union acpi_operand_object *original_object,
 389                             union acpi_operand_object **return_object)
 390 {
 391         union acpi_operand_object *new_object;
 392         u8 *buffer;
 393
 394         /*
 395          * We can fix the following cases for an expected resource template:
 396          * 1. No return value (interpreter slack mode is disabled)
 397          * 2. A "Return (Zero)" statement
 398          * 3. A "Return empty buffer" statement
 399          *
 400          * We will return a buffer containing a single end_tag
 401          * resource descriptor.
 402          */
 403         if (original_object) {
 404                 switch (original_object->common.type) {
 405                 case ACPI_TYPE_INTEGER:
 406
 407                         /* We can only repair an Integer==0 */
 408
 409                         if (original_object->integer.value) {
 410                                 return (AE_AML_OPERAND_TYPE);
 411                         }
 412                         break;
 413
 414                 case ACPI_TYPE_BUFFER:
 415
 416                         if (original_object->buffer.length) {
 417
 418                                 /* Additional checks can be added in the future */
 419
 420                                 *return_object = NULL;
 421                                 return (AE_OK);
 422                         }
 423                         break;
 424
 425                 case ACPI_TYPE_STRING:
 426                 default:
 427
 428                         return (AE_AML_OPERAND_TYPE);
 429                 }
 430         }
 431
 432         /* Create the new buffer object for the resource descriptor */
 433
 434         new_object = acpi_ut_create_buffer_object(2);
 435         if (!new_object) {
 436                 return (AE_NO_MEMORY);
 437         }
 438
 439         buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer);
 440
 441         /* Initialize the Buffer with a single end_tag descriptor */
 442
 443         buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE);
 444         buffer[1] = 0x00;
 445
 446         *return_object = new_object;
 447         return (AE_OK);
 448 }
 449
 450 /*******************************************************************************
 451  *
 452  * FUNCTION:    acpi_ns_convert_to_reference
 453  *
 454  * PARAMETERS:  scope               - Namespace node for the method/object
 455  *              original_object     - Object to be converted
 456  *              return_object       - Where the new converted object is returned
 457  *
 458  * RETURN:      Status. AE_OK if conversion was successful
 459  *
 460  * DESCRIPTION: Attempt to convert a Integer object to a object_reference.
 461  *              Buffer.
 462  *
 463  ******************************************************************************/
 464
 465 acpi_status
 466 acpi_ns_convert_to_reference(struct acpi_namespace_node *scope,
 467                              union acpi_operand_object *original_object,
 468                              union acpi_operand_object **return_object)
 469 {
 470         union acpi_operand_object *new_object = NULL;
 471         acpi_status status;
 472         struct acpi_namespace_node *node;
 473         union acpi_generic_state scope_info;
 474         char *name;
 475
 476         ACPI_FUNCTION_NAME(ns_convert_to_reference);
 477
 478         /* Convert path into internal presentation */
 479
 480         status =
 481             acpi_ns_internalize_name(original_object->string.pointer, &name);
 482         if (ACPI_FAILURE(status)) {
 483                 return_ACPI_STATUS(status);
 484         }
 485
 486         /* Find the namespace node */
 487
 488         scope_info.scope.node =
 489             ACPI_CAST_PTR(struct acpi_namespace_node, scope);
 490         status =
 491             acpi_ns_lookup(&scope_info, name, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 492                            ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
 493                            NULL, &node);
 494         if (ACPI_FAILURE(status)) {
 495
 496                 /* Check if we are resolving a named reference within a package */
 497
 498                 ACPI_ERROR_NAMESPACE(original_object->string.pointer, status);
 499                 goto error_exit;
 500         }
 501
 502         /* Create and init a new internal ACPI object */
 503
 504         new_object = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
 505         if (!new_object) {
 506                 status = AE_NO_MEMORY;
 507                 goto error_exit;
 508         }
 509         new_object->reference.node = node;
 510         new_object->reference.object = node->object;
 511         new_object->reference.class = ACPI_REFCLASS_NAME;
 512
 513         /*
 514          * Increase reference of the object if needed (the object is likely a
 515          * null for device nodes).
 516          */
 517         acpi_ut_add_reference(node->object);
 518
 519 error_exit:
 520         ACPI_FREE(name);
 521         *return_object = new_object;
 522         return (AE_OK);
 523 }