git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/resources/rscreate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rscreate - Create resource lists/tables
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   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 <acpi/acresrc.h>
  46 #include <acpi/amlcode.h>
  47 #include <acpi/acnamesp.h>
  48
  49 #define _COMPONENT          ACPI_RESOURCES
  50 ACPI_MODULE_NAME("rscreate")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_rs_create_resource_list
  55  *
  56  * PARAMETERS:  byte_stream_buffer      - Pointer to the resource byte stream
  57  *              output_buffer           - Pointer to the user's buffer
  58  *
  59  * RETURN:      Status  - AE_OK if okay, else a valid acpi_status code
  60  *              If output_buffer is not large enough, output_buffer_length
  61  *              indicates how large output_buffer should be, else it
  62  *              indicates how may u8 elements of output_buffer are valid.
  63  *
  64  * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method
  65  *              execution and parses the stream to create a linked list
  66  *              of device resources.
  67  *
  68  ******************************************************************************/
  69 acpi_status
  70 acpi_rs_create_resource_list(union acpi_operand_object *byte_stream_buffer,
  71                              struct acpi_buffer *output_buffer)
  72 {
  73
  74         acpi_status status;
  75         u8 *byte_stream_start;
  76         acpi_size list_size_needed = 0;
  77         u32 byte_stream_buffer_length;
  78
  79         ACPI_FUNCTION_TRACE("rs_create_resource_list");
  80
  81         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "byte_stream_buffer = %p\n",
  82                           byte_stream_buffer));
  83
  84         /* Params already validated, so we don't re-validate here */
  85
  86         byte_stream_buffer_length = byte_stream_buffer->buffer.length;
  87         byte_stream_start = byte_stream_buffer->buffer.pointer;
  88
  89         /*
  90          * Pass the byte_stream_buffer into a module that can calculate
  91          * the buffer size needed for the linked list
  92          */
  93         status =
  94             acpi_rs_get_list_length(byte_stream_start,
  95                                     byte_stream_buffer_length,
  96                                     &list_size_needed);
  97
  98         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X list_size_needed=%X\n",
  99                           status, (u32) list_size_needed));
 100         if (ACPI_FAILURE(status)) {
 101                 return_ACPI_STATUS(status);
 102         }
 103
 104         /* Validate/Allocate/Clear caller buffer */
 105
 106         status = acpi_ut_initialize_buffer(output_buffer, list_size_needed);
 107         if (ACPI_FAILURE(status)) {
 108                 return_ACPI_STATUS(status);
 109         }
 110
 111         /* Do the conversion */
 112
 113         status =
 114             acpi_rs_byte_stream_to_list(byte_stream_start,
 115                                         byte_stream_buffer_length,
 116                                         output_buffer->pointer);
 117         if (ACPI_FAILURE(status)) {
 118                 return_ACPI_STATUS(status);
 119         }
 120
 121         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "output_buffer %p Length %X\n",
 122                           output_buffer->pointer, (u32) output_buffer->length));
 123         return_ACPI_STATUS(AE_OK);
 124 }
 125
 126 /*******************************************************************************
 127  *
 128  * FUNCTION:    acpi_rs_create_pci_routing_table
 129  *
 130  * PARAMETERS:  package_object          - Pointer to an union acpi_operand_object
 131  *                                        package
 132  *              output_buffer           - Pointer to the user's buffer
 133  *
 134  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 135  *              If the output_buffer is too small, the error will be
 136  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 137  *              to the size buffer needed.
 138  *
 139  * DESCRIPTION: Takes the union acpi_operand_object    package and creates a
 140  *              linked list of PCI interrupt descriptions
 141  *
 142  * NOTE: It is the caller's responsibility to ensure that the start of the
 143  * output buffer is aligned properly (if necessary).
 144  *
 145  ******************************************************************************/
 146
 147 acpi_status
 148 acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
 149                                  struct acpi_buffer *output_buffer)
 150 {
 151         u8 *buffer;
 152         union acpi_operand_object **top_object_list;
 153         union acpi_operand_object **sub_object_list;
 154         union acpi_operand_object *obj_desc;
 155         acpi_size buffer_size_needed = 0;
 156         u32 number_of_elements;
 157         u32 index;
 158         struct acpi_pci_routing_table *user_prt;
 159         struct acpi_namespace_node *node;
 160         acpi_status status;
 161         struct acpi_buffer path_buffer;
 162
 163         ACPI_FUNCTION_TRACE("rs_create_pci_routing_table");
 164
 165         /* Params already validated, so we don't re-validate here */
 166
 167         /* Get the required buffer length */
 168
 169         status = acpi_rs_get_pci_routing_table_length(package_object,
 170                                                       &buffer_size_needed);
 171         if (ACPI_FAILURE(status)) {
 172                 return_ACPI_STATUS(status);
 173         }
 174
 175         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "buffer_size_needed = %X\n",
 176                           (u32) buffer_size_needed));
 177
 178         /* Validate/Allocate/Clear caller buffer */
 179
 180         status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed);
 181         if (ACPI_FAILURE(status)) {
 182                 return_ACPI_STATUS(status);
 183         }
 184
 185         /*
 186          * Loop through the ACPI_INTERNAL_OBJECTS - Each object
 187          * should be a package that in turn contains an
 188          * acpi_integer Address, a u8 Pin, a Name and a u8 source_index.
 189          */
 190         top_object_list = package_object->package.elements;
 191         number_of_elements = package_object->package.count;
 192         buffer = output_buffer->pointer;
 193         user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 194
 195         for (index = 0; index < number_of_elements; index++) {
 196                 /*
 197                  * Point user_prt past this current structure
 198                  *
 199                  * NOTE: On the first iteration, user_prt->Length will
 200                  * be zero because we cleared the return buffer earlier
 201                  */
 202                 buffer += user_prt->length;
 203                 user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 204
 205                 /*
 206                  * Fill in the Length field with the information we have at this point.
 207                  * The minus four is to subtract the size of the u8 Source[4] member
 208                  * because it is added below.
 209                  */
 210                 user_prt->length = (sizeof(struct acpi_pci_routing_table) - 4);
 211
 212                 /* Each element of the top-level package must also be a package */
 213
 214                 if (ACPI_GET_OBJECT_TYPE(*top_object_list) != ACPI_TYPE_PACKAGE) {
 215                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 216                                           "(PRT[%X]) Need sub-package, found %s\n",
 217                                           index,
 218                                           acpi_ut_get_object_type_name
 219                                           (*top_object_list)));
 220                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 221                 }
 222
 223                 /* Each sub-package must be of length 4 */
 224
 225                 if ((*top_object_list)->package.count != 4) {
 226                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 227                                           "(PRT[%X]) Need package of length 4, found length %d\n",
 228                                           index,
 229                                           (*top_object_list)->package.count));
 230                         return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT);
 231                 }
 232
 233                 /*
 234                  * Dereference the sub-package.
 235                  * The sub_object_list will now point to an array of the four IRQ
 236                  * elements: [Address, Pin, Source, source_index]
 237                  */
 238                 sub_object_list = (*top_object_list)->package.elements;
 239
 240                 /* 1) First subobject: Dereference the PRT.Address */
 241
 242                 obj_desc = sub_object_list[0];
 243                 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 244                         user_prt->address = obj_desc->integer.value;
 245                 } else {
 246                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 247                                           "(PRT[%X].Address) Need Integer, found %s\n",
 248                                           index,
 249                                           acpi_ut_get_object_type_name
 250                                           (obj_desc)));
 251                         return_ACPI_STATUS(AE_BAD_DATA);
 252                 }
 253
 254                 /* 2) Second subobject: Dereference the PRT.Pin */
 255
 256                 obj_desc = sub_object_list[1];
 257                 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 258                         user_prt->pin = (u32) obj_desc->integer.value;
 259                 } else {
 260                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 261                                           "(PRT[%X].Pin) Need Integer, found %s\n",
 262                                           index,
 263                                           acpi_ut_get_object_type_name
 264                                           (obj_desc)));
 265                         return_ACPI_STATUS(AE_BAD_DATA);
 266                 }
 267
 268                 /* 3) Third subobject: Dereference the PRT.source_name */
 269
 270                 obj_desc = sub_object_list[2];
 271                 switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 272                 case ACPI_TYPE_LOCAL_REFERENCE:
 273
 274                         if (obj_desc->reference.opcode != AML_INT_NAMEPATH_OP) {
 275                                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 276                                                   "(PRT[%X].Source) Need name, found reference op %X\n",
 277                                                   index,
 278                                                   obj_desc->reference.opcode));
 279                                 return_ACPI_STATUS(AE_BAD_DATA);
 280                         }
 281
 282                         node = obj_desc->reference.node;
 283
 284                         /* Use *remaining* length of the buffer as max for pathname */
 285
 286                         path_buffer.length = output_buffer->length -
 287                             (u32) ((u8 *) user_prt->source -
 288                                    (u8 *) output_buffer->pointer);
 289                         path_buffer.pointer = user_prt->source;
 290
 291                         status =
 292                             acpi_ns_handle_to_pathname((acpi_handle) node,
 293                                                        &path_buffer);
 294
 295                         /* +1 to include null terminator */
 296
 297                         user_prt->length +=
 298                             (u32) ACPI_STRLEN(user_prt->source) + 1;
 299                         break;
 300
 301                 case ACPI_TYPE_STRING:
 302
 303                         ACPI_STRCPY(user_prt->source, obj_desc->string.pointer);
 304
 305                         /*
 306                          * Add to the Length field the length of the string
 307                          * (add 1 for terminator)
 308                          */
 309                         user_prt->length += obj_desc->string.length + 1;
 310                         break;
 311
 312                 case ACPI_TYPE_INTEGER:
 313                         /*
 314                          * If this is a number, then the Source Name is NULL, since the
 315                          * entire buffer was zeroed out, we can leave this alone.
 316                          *
 317                          * Add to the Length field the length of the u32 NULL
 318                          */
 319                         user_prt->length += sizeof(u32);
 320                         break;
 321
 322                 default:
 323
 324                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 325                                           "(PRT[%X].Source) Need Ref/String/Integer, found %s\n",
 326                                           index,
 327                                           acpi_ut_get_object_type_name
 328                                           (obj_desc)));
 329                         return_ACPI_STATUS(AE_BAD_DATA);
 330                 }
 331
 332                 /* Now align the current length */
 333
 334                 user_prt->length =
 335                     (u32) ACPI_ROUND_UP_to_64_bITS(user_prt->length);
 336
 337                 /* 4) Fourth subobject: Dereference the PRT.source_index */
 338
 339                 obj_desc = sub_object_list[3];
 340                 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 341                         user_prt->source_index = (u32) obj_desc->integer.value;
 342                 } else {
 343                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 344                                           "(PRT[%X].source_index) Need Integer, found %s\n",
 345                                           index,
 346                                           acpi_ut_get_object_type_name
 347                                           (obj_desc)));
 348                         return_ACPI_STATUS(AE_BAD_DATA);
 349                 }
 350
 351                 /* Point to the next union acpi_operand_object in the top level package */
 352
 353                 top_object_list++;
 354         }
 355
 356         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "output_buffer %p Length %X\n",
 357                           output_buffer->pointer, (u32) output_buffer->length));
 358         return_ACPI_STATUS(AE_OK);
 359 }
 360
 361 /*******************************************************************************
 362  *
 363  * FUNCTION:    acpi_rs_create_byte_stream
 364  *
 365  * PARAMETERS:  linked_list_buffer      - Pointer to the resource linked list
 366  *              output_buffer           - Pointer to the user's buffer
 367  *
 368  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 369  *              If the output_buffer is too small, the error will be
 370  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 371  *              to the size buffer needed.
 372  *
 373  * DESCRIPTION: Takes the linked list of device resources and
 374  *              creates a bytestream to be used as input for the
 375  *              _SRS control method.
 376  *
 377  ******************************************************************************/
 378
 379 acpi_status
 380 acpi_rs_create_byte_stream(struct acpi_resource *linked_list_buffer,
 381                            struct acpi_buffer *output_buffer)
 382 {
 383         acpi_status status;
 384         acpi_size byte_stream_size_needed = 0;
 385
 386         ACPI_FUNCTION_TRACE("rs_create_byte_stream");
 387
 388         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "linked_list_buffer = %p\n",
 389                           linked_list_buffer));
 390
 391         /*
 392          * Params already validated, so we don't re-validate here
 393          *
 394          * Pass the linked_list_buffer into a module that calculates
 395          * the buffer size needed for the byte stream.
 396          */
 397         status = acpi_rs_get_byte_stream_length(linked_list_buffer,
 398                                                 &byte_stream_size_needed);
 399
 400         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "byte_stream_size_needed=%X, %s\n",
 401                           (u32) byte_stream_size_needed,
 402                           acpi_format_exception(status)));
 403         if (ACPI_FAILURE(status)) {
 404                 return_ACPI_STATUS(status);
 405         }
 406
 407         /* Validate/Allocate/Clear caller buffer */
 408
 409         status =
 410             acpi_ut_initialize_buffer(output_buffer, byte_stream_size_needed);
 411         if (ACPI_FAILURE(status)) {
 412                 return_ACPI_STATUS(status);
 413         }
 414
 415         /* Do the conversion */
 416
 417         status =
 418             acpi_rs_list_to_byte_stream(linked_list_buffer,
 419                                         byte_stream_size_needed,
 420                                         output_buffer->pointer);
 421         if (ACPI_FAILURE(status)) {
 422                 return_ACPI_STATUS(status);
 423         }
 424
 425         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "output_buffer %p Length %X\n",
 426                           output_buffer->pointer, (u32) output_buffer->length));
 427         return_ACPI_STATUS(AE_OK);
 428 }