drivers/acpi/acpica/exconcat.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exconcat - Concatenate-type AML operators
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acinterp.h"
  47 #include "amlresrc.h"
  48
  49 #define _COMPONENT          ACPI_EXECUTER
  50 ACPI_MODULE_NAME("exconcat")
  51
  52 /* Local Prototypes */
  53 static acpi_status
  54 acpi_ex_convert_to_object_type_string(union acpi_operand_object *obj_desc,
  55                                       union acpi_operand_object **result_desc);
  56
  57 /*******************************************************************************
  58  *
  59  * FUNCTION:    acpi_ex_do_concatenate
  60  *
  61  * PARAMETERS:  operand0            - First source object
  62  *              operand1            - Second source object
  63  *              actual_return_desc  - Where to place the return object
  64  *              walk_state          - Current walk state
  65  *
  66  * RETURN:      Status
  67  *
  68  * DESCRIPTION: Concatenate two objects with the ACPI-defined conversion
  69  *              rules as necessary.
  70  * NOTE:
  71  * Per the ACPI spec (up to 6.1), Concatenate only supports Integer,
  72  * String, and Buffer objects. However, we support all objects here
  73  * as an extension. This improves the usefulness of both Concatenate
  74  * and the Printf/Fprintf macros. The extension returns a string
  75  * describing the object type for the other objects.
  76  * 02/2016.
  77  *
  78  ******************************************************************************/
  79
  80 acpi_status
  81 acpi_ex_do_concatenate(union acpi_operand_object *operand0,
  82                        union acpi_operand_object *operand1,
  83                        union acpi_operand_object **actual_return_desc,
  84                        struct acpi_walk_state *walk_state)
  85 {
  86         union acpi_operand_object *local_operand0 = operand0;
  87         union acpi_operand_object *local_operand1 = operand1;
  88         union acpi_operand_object *temp_operand1 = NULL;
  89         union acpi_operand_object *return_desc;
  90         char *buffer;
  91         acpi_object_type operand0_type;
  92         acpi_object_type operand1_type;
  93         acpi_status status;
  94
  95         ACPI_FUNCTION_TRACE(ex_do_concatenate);
  96
  97         /* Operand 0 preprocessing */
  98
  99         switch (operand0->common.type) {
 100         case ACPI_TYPE_INTEGER:
 101         case ACPI_TYPE_STRING:
 102         case ACPI_TYPE_BUFFER:
 103
 104                 operand0_type = operand0->common.type;
 105                 break;
 106
 107         default:
 108
 109                 /* For all other types, get the "object type" string */
 110
 111                 status =
 112                     acpi_ex_convert_to_object_type_string(operand0,
 113                                                           &local_operand0);
 114                 if (ACPI_FAILURE(status)) {
 115                         goto cleanup;
 116                 }
 117
 118                 operand0_type = ACPI_TYPE_STRING;
 119                 break;
 120         }
 121
 122         /* Operand 1 preprocessing */
 123
 124         switch (operand1->common.type) {
 125         case ACPI_TYPE_INTEGER:
 126         case ACPI_TYPE_STRING:
 127         case ACPI_TYPE_BUFFER:
 128
 129                 operand1_type = operand1->common.type;
 130                 break;
 131
 132         default:
 133
 134                 /* For all other types, get the "object type" string */
 135
 136                 status =
 137                     acpi_ex_convert_to_object_type_string(operand1,
 138                                                           &local_operand1);
 139                 if (ACPI_FAILURE(status)) {
 140                         goto cleanup;
 141                 }
 142
 143                 operand1_type = ACPI_TYPE_STRING;
 144                 break;
 145         }
 146
 147         /*
 148          * Convert the second operand if necessary. The first operand (0)
 149          * determines the type of the second operand (1) (See the Data Types
 150          * section of the ACPI specification). Both object types are
 151          * guaranteed to be either Integer/String/Buffer by the operand
 152          * resolution mechanism.
 153          */
 154         switch (operand0_type) {
 155         case ACPI_TYPE_INTEGER:
 156
 157                 status =
 158                     acpi_ex_convert_to_integer(local_operand1, &temp_operand1,
 159                                                16);
 160                 break;
 161
 162         case ACPI_TYPE_BUFFER:
 163
 164                 status =
 165                     acpi_ex_convert_to_buffer(local_operand1, &temp_operand1);
 166                 break;
 167
 168         case ACPI_TYPE_STRING:
 169
 170                 switch (operand1_type) {
 171                 case ACPI_TYPE_INTEGER:
 172                 case ACPI_TYPE_STRING:
 173                 case ACPI_TYPE_BUFFER:
 174
 175                         /* Other types have already been converted to string */
 176
 177                         status =
 178                             acpi_ex_convert_to_string(local_operand1,
 179                                                       &temp_operand1,
 180                                                       ACPI_IMPLICIT_CONVERT_HEX);
 181                         break;
 182
 183                 default:
 184
 185                         status = AE_OK;
 186                         break;
 187                 }
 188                 break;
 189
 190         default:
 191
 192                 ACPI_ERROR((AE_INFO, "Invalid object type: 0x%X",
 193                             operand0->common.type));
 194                 status = AE_AML_INTERNAL;
 195         }
 196
 197         if (ACPI_FAILURE(status)) {
 198                 goto cleanup;
 199         }
 200
 201         /* Take care with any newly created operand objects */
 202
 203         if ((local_operand1 != operand1) && (local_operand1 != temp_operand1)) {
 204                 acpi_ut_remove_reference(local_operand1);
 205         }
 206
 207         local_operand1 = temp_operand1;
 208
 209         /*
 210          * Both operands are now known to be the same object type
 211          * (Both are Integer, String, or Buffer), and we can now perform
 212          * the concatenation.
 213          *
 214          * There are three cases to handle, as per the ACPI spec:
 215          *
 216          * 1) Two Integers concatenated to produce a new Buffer
 217          * 2) Two Strings concatenated to produce a new String
 218          * 3) Two Buffers concatenated to produce a new Buffer
 219          */
 220         switch (operand0_type) {
 221         case ACPI_TYPE_INTEGER:
 222
 223                 /* Result of two Integers is a Buffer */
 224                 /* Need enough buffer space for two integers */
 225
 226                 return_desc = acpi_ut_create_buffer_object((acpi_size)
 227                                                            ACPI_MUL_2
 228                                                            (acpi_gbl_integer_byte_width));
 229                 if (!return_desc) {
 230                         status = AE_NO_MEMORY;
 231                         goto cleanup;
 232                 }
 233
 234                 buffer = (char *)return_desc->buffer.pointer;
 235
 236                 /* Copy the first integer, LSB first */
 237
 238                 memcpy(buffer, &operand0->integer.value,
 239                        acpi_gbl_integer_byte_width);
 240
 241                 /* Copy the second integer (LSB first) after the first */
 242
 243                 memcpy(buffer + acpi_gbl_integer_byte_width,
 244                        &local_operand1->integer.value,
 245                        acpi_gbl_integer_byte_width);
 246                 break;
 247
 248         case ACPI_TYPE_STRING:
 249
 250                 /* Result of two Strings is a String */
 251
 252                 return_desc = acpi_ut_create_string_object(((acpi_size)
 253                                                             local_operand0->
 254                                                             string.length +
 255                                                             local_operand1->
 256                                                             string.length));
 257                 if (!return_desc) {
 258                         status = AE_NO_MEMORY;
 259                         goto cleanup;
 260                 }
 261
 262                 buffer = return_desc->string.pointer;
 263
 264                 /* Concatenate the strings */
 265
 266                 strcpy(buffer, local_operand0->string.pointer);
 267                 strcat(buffer, local_operand1->string.pointer);
 268                 break;
 269
 270         case ACPI_TYPE_BUFFER:
 271
 272                 /* Result of two Buffers is a Buffer */
 273
 274                 return_desc = acpi_ut_create_buffer_object(((acpi_size)
 275                                                             operand0->buffer.
 276                                                             length +
 277                                                             local_operand1->
 278                                                             buffer.length));
 279                 if (!return_desc) {
 280                         status = AE_NO_MEMORY;
 281                         goto cleanup;
 282                 }
 283
 284                 buffer = (char *)return_desc->buffer.pointer;
 285
 286                 /* Concatenate the buffers */
 287
 288                 memcpy(buffer, operand0->buffer.pointer,
 289                        operand0->buffer.length);
 290                 memcpy(buffer + operand0->buffer.length,
 291                        local_operand1->buffer.pointer,
 292                        local_operand1->buffer.length);
 293                 break;
 294
 295         default:
 296
 297                 /* Invalid object type, should not happen here */
 298
 299                 ACPI_ERROR((AE_INFO, "Invalid object type: 0x%X",
 300                             operand0->common.type));
 301                 status = AE_AML_INTERNAL;
 302                 goto cleanup;
 303         }
 304
 305         *actual_return_desc = return_desc;
 306
 307 cleanup:
 308         if (local_operand0 != operand0) {
 309                 acpi_ut_remove_reference(local_operand0);
 310         }
 311
 312         if (local_operand1 != operand1) {
 313                 acpi_ut_remove_reference(local_operand1);
 314         }
 315
 316         return_ACPI_STATUS(status);
 317 }
 318
 319 /*******************************************************************************
 320  *
 321  * FUNCTION:    acpi_ex_convert_to_object_type_string
 322  *
 323  * PARAMETERS:  obj_desc            - Object to be converted
 324  *              return_desc         - Where to place the return object
 325  *
 326  * RETURN:      Status
 327  *
 328  * DESCRIPTION: Convert an object of arbitrary type to a string object that
 329  *              contains the namestring for the object. Used for the
 330  *              concatenate operator.
 331  *
 332  ******************************************************************************/
 333
 334 static acpi_status
 335 acpi_ex_convert_to_object_type_string(union acpi_operand_object *obj_desc,
 336                                       union acpi_operand_object **result_desc)
 337 {
 338         union acpi_operand_object *return_desc;
 339         const char *type_string;
 340
 341         type_string = acpi_ut_get_type_name(obj_desc->common.type);
 342
 343         return_desc = acpi_ut_create_string_object(((acpi_size)strlen(type_string) + 9));       /* 9 For "[ Object]" */
 344         if (!return_desc) {
 345                 return (AE_NO_MEMORY);
 346         }
 347
 348         strcpy(return_desc->string.pointer, "[");
 349         strcat(return_desc->string.pointer, type_string);
 350         strcat(return_desc->string.pointer, " Object]");
 351
 352         *result_desc = return_desc;
 353         return (AE_OK);
 354 }
 355
 356 /*******************************************************************************
 357  *
 358  * FUNCTION:    acpi_ex_concat_template
 359  *
 360  * PARAMETERS:  operand0            - First source object
 361  *              operand1            - Second source object
 362  *              actual_return_desc  - Where to place the return object
 363  *              walk_state          - Current walk state
 364  *
 365  * RETURN:      Status
 366  *
 367  * DESCRIPTION: Concatenate two resource templates
 368  *
 369  ******************************************************************************/
 370
 371 acpi_status
 372 acpi_ex_concat_template(union acpi_operand_object *operand0,
 373                         union acpi_operand_object *operand1,
 374                         union acpi_operand_object **actual_return_desc,
 375                         struct acpi_walk_state *walk_state)
 376 {
 377         acpi_status status;
 378         union acpi_operand_object *return_desc;
 379         u8 *new_buf;
 380         u8 *end_tag;
 381         acpi_size length0;
 382         acpi_size length1;
 383         acpi_size new_length;
 384
 385         ACPI_FUNCTION_TRACE(ex_concat_template);
 386
 387         /*
 388          * Find the end_tag descriptor in each resource template.
 389          * Note1: returned pointers point TO the end_tag, not past it.
 390          * Note2: zero-length buffers are allowed; treated like one end_tag
 391          */
 392
 393         /* Get the length of the first resource template */
 394
 395         status = acpi_ut_get_resource_end_tag(operand0, &end_tag);
 396         if (ACPI_FAILURE(status)) {
 397                 return_ACPI_STATUS(status);
 398         }
 399
 400         length0 = ACPI_PTR_DIFF(end_tag, operand0->buffer.pointer);
 401
 402         /* Get the length of the second resource template */
 403
 404         status = acpi_ut_get_resource_end_tag(operand1, &end_tag);
 405         if (ACPI_FAILURE(status)) {
 406                 return_ACPI_STATUS(status);
 407         }
 408
 409         length1 = ACPI_PTR_DIFF(end_tag, operand1->buffer.pointer);
 410
 411         /* Combine both lengths, minimum size will be 2 for end_tag */
 412
 413         new_length = length0 + length1 + sizeof(struct aml_resource_end_tag);
 414
 415         /* Create a new buffer object for the result (with one end_tag) */
 416
 417         return_desc = acpi_ut_create_buffer_object(new_length);
 418         if (!return_desc) {
 419                 return_ACPI_STATUS(AE_NO_MEMORY);
 420         }
 421
 422         /*
 423          * Copy the templates to the new buffer, 0 first, then 1 follows. One
 424          * end_tag descriptor is copied from Operand1.
 425          */
 426         new_buf = return_desc->buffer.pointer;
 427         memcpy(new_buf, operand0->buffer.pointer, length0);
 428         memcpy(new_buf + length0, operand1->buffer.pointer, length1);
 429
 430         /* Insert end_tag and set the checksum to zero, means "ignore checksum" */
 431
 432         new_buf[new_length - 1] = 0;
 433         new_buf[new_length - 2] = ACPI_RESOURCE_NAME_END_TAG | 1;
 434
 435         /* Return the completed resource template */
 436
 437         *actual_return_desc = return_desc;
 438         return_ACPI_STATUS(AE_OK);
 439 }