| 1 | /******************************************************************************* |
| 2 | * |
| 3 | * Module Name: rscalc - Calculate stream and list lengths |
| 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/amlresrc.h> |
| 48 | #include <acpi/acnamesp.h> |
| 49 | |
| 50 | #define _COMPONENT ACPI_RESOURCES |
| 51 | ACPI_MODULE_NAME("rscalc") |
| 52 | |
| 53 | /* |
| 54 | * Base sizes for external resource descriptors, indexed by internal type. |
| 55 | * Includes size of the descriptor header (1 byte for small descriptors, |
| 56 | * 3 bytes for large descriptors) |
| 57 | */ |
| 58 | static u8 acpi_gbl_stream_sizes[] = { |
| 59 | 4, /* ACPI_RSTYPE_IRQ (Byte 3 is optional, but always created) */ |
| 60 | 3, /* ACPI_RSTYPE_DMA */ |
| 61 | 2, /* ACPI_RSTYPE_START_DPF (Byte 1 is optional, but always created) */ |
| 62 | 1, /* ACPI_RSTYPE_END_DPF */ |
| 63 | 8, /* ACPI_RSTYPE_IO */ |
| 64 | 4, /* ACPI_RSTYPE_FIXED_IO */ |
| 65 | 1, /* ACPI_RSTYPE_VENDOR */ |
| 66 | 2, /* ACPI_RSTYPE_END_TAG */ |
| 67 | 12, /* ACPI_RSTYPE_MEM24 */ |
| 68 | 20, /* ACPI_RSTYPE_MEM32 */ |
| 69 | 12, /* ACPI_RSTYPE_FIXED_MEM32 */ |
| 70 | 16, /* ACPI_RSTYPE_ADDRESS16 */ |
| 71 | 26, /* ACPI_RSTYPE_ADDRESS32 */ |
| 72 | 46, /* ACPI_RSTYPE_ADDRESS64 */ |
| 73 | 9, /* ACPI_RSTYPE_EXT_IRQ */ |
| 74 | 15 /* ACPI_RSTYPE_GENERIC_REG */ |
| 75 | }; |
| 76 | |
| 77 | /* |
| 78 | * Base sizes of resource descriptors, both the actual AML stream length and |
| 79 | * size of the internal struct representation. |
| 80 | */ |
| 81 | struct acpi_resource_sizes { |
| 82 | u8 minimum_stream_size; |
| 83 | u8 minimum_struct_size; |
| 84 | }; |
| 85 | |
| 86 | static struct acpi_resource_sizes acpi_gbl_sm_resource_sizes[] = { |
| 87 | {0, 0}, /* 0x00, Reserved */ |
| 88 | {0, 0}, /* 0x01, Reserved */ |
| 89 | {0, 0}, /* 0x02, Reserved */ |
| 90 | {0, 0}, /* 0x03, Reserved */ |
| 91 | {3, ACPI_SIZEOF_RESOURCE(struct acpi_resource_irq)}, /* ACPI_RDESC_TYPE_IRQ_FORMAT */ |
| 92 | {3, ACPI_SIZEOF_RESOURCE(struct acpi_resource_dma)}, /* ACPI_RDESC_TYPE_DMA_FORMAT */ |
| 93 | {1, ACPI_SIZEOF_RESOURCE(struct acpi_resource_start_dpf)}, /* ACPI_RDESC_TYPE_START_DEPENDENT */ |
| 94 | {1, ACPI_RESOURCE_LENGTH}, /* ACPI_RDESC_TYPE_END_DEPENDENT */ |
| 95 | {8, ACPI_SIZEOF_RESOURCE(struct acpi_resource_io)}, /* ACPI_RDESC_TYPE_IO_PORT */ |
| 96 | {4, ACPI_SIZEOF_RESOURCE(struct acpi_resource_fixed_io)}, /* ACPI_RDESC_TYPE_FIXED_IO_PORT */ |
| 97 | {0, 0}, /* 0x0A, Reserved */ |
| 98 | {0, 0}, /* 0x0B, Reserved */ |
| 99 | {0, 0}, /* 0x0C, Reserved */ |
| 100 | {0, 0}, /* 0x0D, Reserved */ |
| 101 | {1, ACPI_SIZEOF_RESOURCE(struct acpi_resource_vendor)}, /* ACPI_RDESC_TYPE_SMALL_VENDOR */ |
| 102 | {2, ACPI_RESOURCE_LENGTH}, /* ACPI_RDESC_TYPE_END_TAG */ |
| 103 | }; |
| 104 | |
| 105 | static struct acpi_resource_sizes acpi_gbl_lg_resource_sizes[] = { |
| 106 | {0, 0}, /* 0x00, Reserved */ |
| 107 | {12, ACPI_SIZEOF_RESOURCE(struct acpi_resource_mem24)}, /* ACPI_RDESC_TYPE_MEMORY_24 */ |
| 108 | {15, ACPI_SIZEOF_RESOURCE(struct acpi_resource_generic_reg)}, /* ACPI_RDESC_TYPE_GENERIC_REGISTER */ |
| 109 | {0, 0}, /* 0x03, Reserved */ |
| 110 | {3, ACPI_SIZEOF_RESOURCE(struct acpi_resource_vendor)}, /* ACPI_RDESC_TYPE_LARGE_VENDOR */ |
| 111 | {20, ACPI_SIZEOF_RESOURCE(struct acpi_resource_mem32)}, /* ACPI_RDESC_TYPE_MEMORY_32 */ |
| 112 | {12, ACPI_SIZEOF_RESOURCE(struct acpi_resource_fixed_mem32)}, /* ACPI_RDESC_TYPE_FIXED_MEMORY_32 */ |
| 113 | {26, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address32)}, /* ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE */ |
| 114 | {16, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address16)}, /* ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE */ |
| 115 | {9, ACPI_SIZEOF_RESOURCE(struct acpi_resource_ext_irq)}, /* ACPI_RDESC_TYPE_EXTENDED_XRUPT */ |
| 116 | {46, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address64)}, /* ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE */ |
| 117 | {56, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address64)}, /* ACPI_RDESC_TYPE_EXTENDED_ADDRESS_SPACE */ |
| 118 | }; |
| 119 | |
| 120 | /* Local prototypes */ |
| 121 | |
| 122 | static u8 acpi_rs_count_set_bits(u16 bit_field); |
| 123 | |
| 124 | static struct acpi_resource_sizes *acpi_rs_get_resource_sizes(u8 resource_type); |
| 125 | |
| 126 | static u16 acpi_rs_get_resource_length(u8 * resource); |
| 127 | |
| 128 | static acpi_size |
| 129 | acpi_rs_struct_option_length(struct acpi_resource_source *resource_source); |
| 130 | |
| 131 | static u32 |
| 132 | acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length); |
| 133 | |
| 134 | /******************************************************************************* |
| 135 | * |
| 136 | * FUNCTION: acpi_rs_count_set_bits |
| 137 | * |
| 138 | * PARAMETERS: bit_field - Field in which to count bits |
| 139 | * |
| 140 | * RETURN: Number of bits set within the field |
| 141 | * |
| 142 | * DESCRIPTION: Count the number of bits set in a resource field. Used for |
| 143 | * (Short descriptor) interrupt and DMA lists. |
| 144 | * |
| 145 | ******************************************************************************/ |
| 146 | |
| 147 | static u8 acpi_rs_count_set_bits(u16 bit_field) |
| 148 | { |
| 149 | u8 bits_set; |
| 150 | |
| 151 | ACPI_FUNCTION_ENTRY(); |
| 152 | |
| 153 | for (bits_set = 0; bit_field; bits_set++) { |
| 154 | /* Zero the least significant bit that is set */ |
| 155 | |
| 156 | bit_field &= (bit_field - 1); |
| 157 | } |
| 158 | |
| 159 | return (bits_set); |
| 160 | } |
| 161 | |
| 162 | /******************************************************************************* |
| 163 | * |
| 164 | * FUNCTION: acpi_rs_get_resource_sizes |
| 165 | * |
| 166 | * PARAMETERS: resource_type - Byte 0 of a resource descriptor |
| 167 | * |
| 168 | * RETURN: Pointer to the resource conversion handler |
| 169 | * |
| 170 | * DESCRIPTION: Extract the Resource Type/Name from the first byte of |
| 171 | * a resource descriptor. |
| 172 | * |
| 173 | ******************************************************************************/ |
| 174 | |
| 175 | static struct acpi_resource_sizes *acpi_rs_get_resource_sizes(u8 resource_type) |
| 176 | { |
| 177 | struct acpi_resource_sizes *size_info; |
| 178 | |
| 179 | ACPI_FUNCTION_ENTRY(); |
| 180 | |
| 181 | /* Determine if this is a small or large resource */ |
| 182 | |
| 183 | if (resource_type & ACPI_RDESC_TYPE_LARGE) { |
| 184 | /* Large Resource Type -- bits 6:0 contain the name */ |
| 185 | |
| 186 | if (resource_type > ACPI_RDESC_LARGE_MAX) { |
| 187 | return (NULL); |
| 188 | } |
| 189 | |
| 190 | size_info = &acpi_gbl_lg_resource_sizes[(resource_type & |
| 191 | ACPI_RDESC_LARGE_MASK)]; |
| 192 | } else { |
| 193 | /* Small Resource Type -- bits 6:3 contain the name */ |
| 194 | |
| 195 | size_info = &acpi_gbl_sm_resource_sizes[((resource_type & |
| 196 | ACPI_RDESC_SMALL_MASK) |
| 197 | >> 3)]; |
| 198 | } |
| 199 | |
| 200 | /* Zero entry indicates an invalid resource type */ |
| 201 | |
| 202 | if (!size_info->minimum_stream_size) { |
| 203 | return (NULL); |
| 204 | } |
| 205 | |
| 206 | return (size_info); |
| 207 | } |
| 208 | |
| 209 | /******************************************************************************* |
| 210 | * |
| 211 | * FUNCTION: acpi_rs_get_resource_length |
| 212 | * |
| 213 | * PARAMETERS: Resource - Pointer to the resource descriptor |
| 214 | * |
| 215 | * RETURN: Byte length of the (AML byte stream) descriptor. By definition, |
| 216 | * this does not include the size of the descriptor header and the |
| 217 | * length field itself. |
| 218 | * |
| 219 | * DESCRIPTION: Extract the length of a resource descriptor. |
| 220 | * |
| 221 | ******************************************************************************/ |
| 222 | |
| 223 | static u16 acpi_rs_get_resource_length(u8 * resource) |
| 224 | { |
| 225 | u16 resource_length; |
| 226 | |
| 227 | ACPI_FUNCTION_ENTRY(); |
| 228 | |
| 229 | /* Determine if this is a small or large resource */ |
| 230 | |
| 231 | if (*resource & ACPI_RDESC_TYPE_LARGE) { |
| 232 | /* Large Resource type -- length is in bytes 1-2 */ |
| 233 | |
| 234 | ACPI_MOVE_16_TO_16(&resource_length, (resource + 1)); |
| 235 | |
| 236 | } else { |
| 237 | /* Small Resource Type -- bits 2:0 of byte 0 contain the length */ |
| 238 | |
| 239 | resource_length = |
| 240 | (u16) (*resource & ACPI_RDESC_SMALL_LENGTH_MASK); |
| 241 | } |
| 242 | |
| 243 | return (resource_length); |
| 244 | } |
| 245 | |
| 246 | /******************************************************************************* |
| 247 | * |
| 248 | * FUNCTION: acpi_rs_struct_option_length |
| 249 | * |
| 250 | * PARAMETERS: resource_source - Pointer to optional descriptor field |
| 251 | * |
| 252 | * RETURN: Status |
| 253 | * |
| 254 | * DESCRIPTION: Common code to handle optional resource_source_index and |
| 255 | * resource_source fields in some Large descriptors. Used during |
| 256 | * list-to-stream conversion |
| 257 | * |
| 258 | ******************************************************************************/ |
| 259 | |
| 260 | static acpi_size |
| 261 | acpi_rs_struct_option_length(struct acpi_resource_source *resource_source) |
| 262 | { |
| 263 | ACPI_FUNCTION_ENTRY(); |
| 264 | |
| 265 | /* |
| 266 | * If the resource_source string is valid, return the size of the string |
| 267 | * (string_length includes the NULL terminator) plus the size of the |
| 268 | * resource_source_index (1). |
| 269 | */ |
| 270 | if (resource_source->string_ptr) { |
| 271 | return ((acpi_size) resource_source->string_length + 1); |
| 272 | } |
| 273 | |
| 274 | return (0); |
| 275 | } |
| 276 | |
| 277 | /******************************************************************************* |
| 278 | * |
| 279 | * FUNCTION: acpi_rs_stream_option_length |
| 280 | * |
| 281 | * PARAMETERS: resource_length - Length from the resource header |
| 282 | * minimum_total_length - Minimum length of this resource, before |
| 283 | * any optional fields. Includes header size |
| 284 | * |
| 285 | * RETURN: Length of optional string (0 if no string present) |
| 286 | * |
| 287 | * DESCRIPTION: Common code to handle optional resource_source_index and |
| 288 | * resource_source fields in some Large descriptors. Used during |
| 289 | * stream-to-list conversion |
| 290 | * |
| 291 | ******************************************************************************/ |
| 292 | |
| 293 | static u32 |
| 294 | acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length) |
| 295 | { |
| 296 | u32 string_length = 0; |
| 297 | u32 minimum_resource_length; |
| 298 | |
| 299 | ACPI_FUNCTION_ENTRY(); |
| 300 | |
| 301 | /* |
| 302 | * The resource_source_index and resource_source are optional elements of some |
| 303 | * Large-type resource descriptors. |
| 304 | */ |
| 305 | |
| 306 | /* Compute minimum size of the data part of the resource descriptor */ |
| 307 | |
| 308 | minimum_resource_length = |
| 309 | minimum_total_length - sizeof(struct asl_large_header); |
| 310 | |
| 311 | /* |
| 312 | * If the length of the actual resource descriptor is greater than the ACPI |
| 313 | * spec-defined minimum length, it means that a resource_source_index exists |
| 314 | * and is followed by a (required) null terminated string. The string length |
| 315 | * (including the null terminator) is the resource length minus the minimum |
| 316 | * length, minus one byte for the resource_source_index itself. |
| 317 | */ |
| 318 | if (resource_length > minimum_resource_length) { |
| 319 | /* Compute the length of the optional string */ |
| 320 | |
| 321 | string_length = resource_length - minimum_resource_length - 1; |
| 322 | } |
| 323 | |
| 324 | /* Round up length to 32 bits for internal structure alignment */ |
| 325 | |
| 326 | return (ACPI_ROUND_UP_to_32_bITS(string_length)); |
| 327 | } |
| 328 | |
| 329 | /******************************************************************************* |
| 330 | * |
| 331 | * FUNCTION: acpi_rs_get_byte_stream_length |
| 332 | * |
| 333 | * PARAMETERS: Resource - Pointer to the resource linked list |
| 334 | * size_needed - Where the required size is returned |
| 335 | * |
| 336 | * RETURN: Status |
| 337 | * |
| 338 | * DESCRIPTION: Takes a linked list of internal resource descriptors and |
| 339 | * calculates the size buffer needed to hold the corresponding |
| 340 | * external resource byte stream. |
| 341 | * |
| 342 | ******************************************************************************/ |
| 343 | |
| 344 | acpi_status |
| 345 | acpi_rs_get_byte_stream_length(struct acpi_resource * resource, |
| 346 | acpi_size * size_needed) |
| 347 | { |
| 348 | acpi_size byte_stream_size_needed = 0; |
| 349 | acpi_size segment_size; |
| 350 | |
| 351 | ACPI_FUNCTION_TRACE("rs_get_byte_stream_length"); |
| 352 | |
| 353 | /* Traverse entire list of internal resource descriptors */ |
| 354 | |
| 355 | while (resource) { |
| 356 | /* Validate the descriptor type */ |
| 357 | |
| 358 | if (resource->type > ACPI_RSTYPE_MAX) { |
| 359 | return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); |
| 360 | } |
| 361 | |
| 362 | /* Get the base size of the (external stream) resource descriptor */ |
| 363 | |
| 364 | segment_size = acpi_gbl_stream_sizes[resource->type]; |
| 365 | |
| 366 | /* |
| 367 | * Augment the base size for descriptors with optional and/or |
| 368 | * variable-length fields |
| 369 | */ |
| 370 | switch (resource->type) { |
| 371 | case ACPI_RSTYPE_VENDOR: |
| 372 | /* |
| 373 | * Vendor Defined Resource: |
| 374 | * For a Vendor Specific resource, if the Length is between 1 and 7 |
| 375 | * it will be created as a Small Resource data type, otherwise it |
| 376 | * is a Large Resource data type. |
| 377 | */ |
| 378 | if (resource->data.vendor_specific.length > 7) { |
| 379 | /* Base size of a Large resource descriptor */ |
| 380 | |
| 381 | segment_size = 3; |
| 382 | } |
| 383 | |
| 384 | /* Add the size of the vendor-specific data */ |
| 385 | |
| 386 | segment_size += resource->data.vendor_specific.length; |
| 387 | break; |
| 388 | |
| 389 | case ACPI_RSTYPE_END_TAG: |
| 390 | /* |
| 391 | * End Tag: |
| 392 | * We are done -- return the accumulated total size. |
| 393 | */ |
| 394 | *size_needed = byte_stream_size_needed + segment_size; |
| 395 | |
| 396 | /* Normal exit */ |
| 397 | |
| 398 | return_ACPI_STATUS(AE_OK); |
| 399 | |
| 400 | case ACPI_RSTYPE_ADDRESS16: |
| 401 | /* |
| 402 | * 16-Bit Address Resource: |
| 403 | * Add the size of the optional resource_source info |
| 404 | */ |
| 405 | segment_size += |
| 406 | acpi_rs_struct_option_length(&resource->data. |
| 407 | address16. |
| 408 | resource_source); |
| 409 | break; |
| 410 | |
| 411 | case ACPI_RSTYPE_ADDRESS32: |
| 412 | /* |
| 413 | * 32-Bit Address Resource: |
| 414 | * Add the size of the optional resource_source info |
| 415 | */ |
| 416 | segment_size += |
| 417 | acpi_rs_struct_option_length(&resource->data. |
| 418 | address32. |
| 419 | resource_source); |
| 420 | break; |
| 421 | |
| 422 | case ACPI_RSTYPE_ADDRESS64: |
| 423 | /* |
| 424 | * 64-Bit Address Resource: |
| 425 | * Add the size of the optional resource_source info |
| 426 | */ |
| 427 | segment_size += |
| 428 | acpi_rs_struct_option_length(&resource->data. |
| 429 | address64. |
| 430 | resource_source); |
| 431 | break; |
| 432 | |
| 433 | case ACPI_RSTYPE_EXT_IRQ: |
| 434 | /* |
| 435 | * Extended IRQ Resource: |
| 436 | * Add the size of each additional optional interrupt beyond the |
| 437 | * required 1 (4 bytes for each u32 interrupt number) |
| 438 | */ |
| 439 | segment_size += (((acpi_size) |
| 440 | resource->data.extended_irq. |
| 441 | number_of_interrupts - 1) * 4); |
| 442 | |
| 443 | /* Add the size of the optional resource_source info */ |
| 444 | |
| 445 | segment_size += |
| 446 | acpi_rs_struct_option_length(&resource->data. |
| 447 | extended_irq. |
| 448 | resource_source); |
| 449 | break; |
| 450 | |
| 451 | default: |
| 452 | break; |
| 453 | } |
| 454 | |
| 455 | /* Update the total */ |
| 456 | |
| 457 | byte_stream_size_needed += segment_size; |
| 458 | |
| 459 | /* Point to the next object */ |
| 460 | |
| 461 | resource = ACPI_PTR_ADD(struct acpi_resource, |
| 462 | resource, resource->length); |
| 463 | } |
| 464 | |
| 465 | /* Did not find an END_TAG descriptor */ |
| 466 | |
| 467 | return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); |
| 468 | } |
| 469 | |
| 470 | /******************************************************************************* |
| 471 | * |
| 472 | * FUNCTION: acpi_rs_get_list_length |
| 473 | * |
| 474 | * PARAMETERS: byte_stream_buffer - Pointer to the resource byte stream |
| 475 | * byte_stream_buffer_length - Size of byte_stream_buffer |
| 476 | * size_needed - Where the size needed is returned |
| 477 | * |
| 478 | * RETURN: Status |
| 479 | * |
| 480 | * DESCRIPTION: Takes an external resource byte stream and calculates the size |
| 481 | * buffer needed to hold the corresponding internal resource |
| 482 | * descriptor linked list. |
| 483 | * |
| 484 | ******************************************************************************/ |
| 485 | |
| 486 | acpi_status |
| 487 | acpi_rs_get_list_length(u8 * byte_stream_buffer, |
| 488 | u32 byte_stream_buffer_length, acpi_size * size_needed) |
| 489 | { |
| 490 | u8 *buffer; |
| 491 | struct acpi_resource_sizes *resource_info; |
| 492 | u32 buffer_size = 0; |
| 493 | u32 bytes_parsed = 0; |
| 494 | u8 resource_type; |
| 495 | u16 temp16; |
| 496 | u16 resource_length; |
| 497 | u16 header_length; |
| 498 | u32 extra_struct_bytes; |
| 499 | |
| 500 | ACPI_FUNCTION_TRACE("rs_get_list_length"); |
| 501 | |
| 502 | while (bytes_parsed < byte_stream_buffer_length) { |
| 503 | /* The next byte in the stream is the resource descriptor type */ |
| 504 | |
| 505 | resource_type = acpi_rs_get_resource_type(*byte_stream_buffer); |
| 506 | |
| 507 | /* Get the base stream size and structure sizes for the descriptor */ |
| 508 | |
| 509 | resource_info = acpi_rs_get_resource_sizes(resource_type); |
| 510 | if (!resource_info) { |
| 511 | return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); |
| 512 | } |
| 513 | |
| 514 | /* Get the Length field from the input resource descriptor */ |
| 515 | |
| 516 | resource_length = |
| 517 | acpi_rs_get_resource_length(byte_stream_buffer); |
| 518 | |
| 519 | /* Augment the size for descriptors with optional fields */ |
| 520 | |
| 521 | extra_struct_bytes = 0; |
| 522 | |
| 523 | if (!(resource_type & ACPI_RDESC_TYPE_LARGE)) { |
| 524 | /* |
| 525 | * Small resource descriptors |
| 526 | */ |
| 527 | header_length = 1; |
| 528 | buffer = byte_stream_buffer + header_length; |
| 529 | |
| 530 | switch (resource_type) { |
| 531 | case ACPI_RDESC_TYPE_IRQ_FORMAT: |
| 532 | /* |
| 533 | * IRQ Resource: |
| 534 | * Get the number of bits set in the IRQ word |
| 535 | */ |
| 536 | ACPI_MOVE_16_TO_16(&temp16, buffer); |
| 537 | |
| 538 | extra_struct_bytes = |
| 539 | (acpi_rs_count_set_bits(temp16) * |
| 540 | sizeof(u32)); |
| 541 | break; |
| 542 | |
| 543 | case ACPI_RDESC_TYPE_DMA_FORMAT: |
| 544 | /* |
| 545 | * DMA Resource: |
| 546 | * Get the number of bits set in the DMA channels byte |
| 547 | */ |
| 548 | extra_struct_bytes = |
| 549 | (acpi_rs_count_set_bits((u16) * buffer) * |
| 550 | sizeof(u32)); |
| 551 | break; |
| 552 | |
| 553 | case ACPI_RDESC_TYPE_SMALL_VENDOR: |
| 554 | /* |
| 555 | * Vendor Specific Resource: |
| 556 | * Ensure a 32-bit boundary for the structure |
| 557 | */ |
| 558 | extra_struct_bytes = |
| 559 | ACPI_ROUND_UP_to_32_bITS(resource_length); |
| 560 | break; |
| 561 | |
| 562 | case ACPI_RDESC_TYPE_END_TAG: |
| 563 | /* |
| 564 | * End Tag: |
| 565 | * Terminate the loop now |
| 566 | */ |
| 567 | byte_stream_buffer_length = bytes_parsed; |
| 568 | break; |
| 569 | |
| 570 | default: |
| 571 | break; |
| 572 | } |
| 573 | } else { |
| 574 | /* |
| 575 | * Large resource descriptors |
| 576 | */ |
| 577 | header_length = sizeof(struct asl_large_header); |
| 578 | buffer = byte_stream_buffer + header_length; |
| 579 | |
| 580 | switch (resource_type) { |
| 581 | case ACPI_RDESC_TYPE_LARGE_VENDOR: |
| 582 | /* |
| 583 | * Vendor Defined Resource: |
| 584 | * Add vendor data and ensure a 32-bit boundary for the structure |
| 585 | */ |
| 586 | extra_struct_bytes = |
| 587 | ACPI_ROUND_UP_to_32_bITS(resource_length); |
| 588 | break; |
| 589 | |
| 590 | case ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE: |
| 591 | case ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE: |
| 592 | /* |
| 593 | * 32-Bit or 16-bit Address Resource: |
| 594 | * Add the size of any optional data (resource_source) |
| 595 | */ |
| 596 | extra_struct_bytes = |
| 597 | acpi_rs_stream_option_length |
| 598 | (resource_length, |
| 599 | resource_info->minimum_stream_size); |
| 600 | break; |
| 601 | |
| 602 | case ACPI_RDESC_TYPE_EXTENDED_XRUPT: |
| 603 | /* |
| 604 | * Extended IRQ: |
| 605 | * Point past the interrupt_vector_flags to get the |
| 606 | * interrupt_table_length. |
| 607 | */ |
| 608 | buffer++; |
| 609 | |
| 610 | /* |
| 611 | * Add 4 bytes for each additional interrupt. Note: at least one |
| 612 | * interrupt is required and is included in the minimum |
| 613 | * descriptor size |
| 614 | */ |
| 615 | extra_struct_bytes = |
| 616 | ((*buffer - 1) * sizeof(u32)); |
| 617 | |
| 618 | /* Add the size of any optional data (resource_source) */ |
| 619 | |
| 620 | extra_struct_bytes += |
| 621 | acpi_rs_stream_option_length(resource_length |
| 622 | - |
| 623 | extra_struct_bytes, |
| 624 | resource_info-> |
| 625 | minimum_stream_size); |
| 626 | break; |
| 627 | |
| 628 | case ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE: |
| 629 | /* |
| 630 | * 64-Bit Address Resource: |
| 631 | * Add the size of any optional data (resource_source) |
| 632 | * Ensure a 64-bit boundary for the structure |
| 633 | */ |
| 634 | extra_struct_bytes = |
| 635 | ACPI_ROUND_UP_to_64_bITS |
| 636 | (acpi_rs_stream_option_length |
| 637 | (resource_length, |
| 638 | resource_info->minimum_stream_size)); |
| 639 | break; |
| 640 | |
| 641 | default: |
| 642 | break; |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | /* Update the required buffer size for the internal descriptor structs */ |
| 647 | |
| 648 | temp16 = |
| 649 | (u16) (resource_info->minimum_struct_size + |
| 650 | extra_struct_bytes); |
| 651 | buffer_size += (u32) ACPI_ALIGN_RESOURCE_SIZE(temp16); |
| 652 | |
| 653 | /* |
| 654 | * Update byte count and point to the next resource within the stream |
| 655 | * using the size of the header plus the length contained in the header |
| 656 | */ |
| 657 | temp16 = (u16) (header_length + resource_length); |
| 658 | bytes_parsed += temp16; |
| 659 | byte_stream_buffer += temp16; |
| 660 | } |
| 661 | |
| 662 | /* This is the data the caller needs */ |
| 663 | |
| 664 | *size_needed = buffer_size; |
| 665 | return_ACPI_STATUS(AE_OK); |
| 666 | } |
| 667 | |
| 668 | /******************************************************************************* |
| 669 | * |
| 670 | * FUNCTION: acpi_rs_get_pci_routing_table_length |
| 671 | * |
| 672 | * PARAMETERS: package_object - Pointer to the package object |
| 673 | * buffer_size_needed - u32 pointer of the size buffer |
| 674 | * needed to properly return the |
| 675 | * parsed data |
| 676 | * |
| 677 | * RETURN: Status |
| 678 | * |
| 679 | * DESCRIPTION: Given a package representing a PCI routing table, this |
| 680 | * calculates the size of the corresponding linked list of |
| 681 | * descriptions. |
| 682 | * |
| 683 | ******************************************************************************/ |
| 684 | |
| 685 | acpi_status |
| 686 | acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object, |
| 687 | acpi_size * buffer_size_needed) |
| 688 | { |
| 689 | u32 number_of_elements; |
| 690 | acpi_size temp_size_needed = 0; |
| 691 | union acpi_operand_object **top_object_list; |
| 692 | u32 index; |
| 693 | union acpi_operand_object *package_element; |
| 694 | union acpi_operand_object **sub_object_list; |
| 695 | u8 name_found; |
| 696 | u32 table_index; |
| 697 | |
| 698 | ACPI_FUNCTION_TRACE("rs_get_pci_routing_table_length"); |
| 699 | |
| 700 | number_of_elements = package_object->package.count; |
| 701 | |
| 702 | /* |
| 703 | * Calculate the size of the return buffer. |
| 704 | * The base size is the number of elements * the sizes of the |
| 705 | * structures. Additional space for the strings is added below. |
| 706 | * The minus one is to subtract the size of the u8 Source[1] |
| 707 | * member because it is added below. |
| 708 | * |
| 709 | * But each PRT_ENTRY structure has a pointer to a string and |
| 710 | * the size of that string must be found. |
| 711 | */ |
| 712 | top_object_list = package_object->package.elements; |
| 713 | |
| 714 | for (index = 0; index < number_of_elements; index++) { |
| 715 | /* Dereference the sub-package */ |
| 716 | |
| 717 | package_element = *top_object_list; |
| 718 | |
| 719 | /* |
| 720 | * The sub_object_list will now point to an array of the |
| 721 | * four IRQ elements: Address, Pin, Source and source_index |
| 722 | */ |
| 723 | sub_object_list = package_element->package.elements; |
| 724 | |
| 725 | /* Scan the irq_table_elements for the Source Name String */ |
| 726 | |
| 727 | name_found = FALSE; |
| 728 | |
| 729 | for (table_index = 0; table_index < 4 && !name_found; |
| 730 | table_index++) { |
| 731 | if ((ACPI_TYPE_STRING == |
| 732 | ACPI_GET_OBJECT_TYPE(*sub_object_list)) |
| 733 | || |
| 734 | ((ACPI_TYPE_LOCAL_REFERENCE == |
| 735 | ACPI_GET_OBJECT_TYPE(*sub_object_list)) |
| 736 | && ((*sub_object_list)->reference.opcode == |
| 737 | AML_INT_NAMEPATH_OP))) { |
| 738 | name_found = TRUE; |
| 739 | } else { |
| 740 | /* Look at the next element */ |
| 741 | |
| 742 | sub_object_list++; |
| 743 | } |
| 744 | } |
| 745 | |
| 746 | temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4); |
| 747 | |
| 748 | /* Was a String type found? */ |
| 749 | |
| 750 | if (name_found) { |
| 751 | if (ACPI_GET_OBJECT_TYPE(*sub_object_list) == |
| 752 | ACPI_TYPE_STRING) { |
| 753 | /* |
| 754 | * The length String.Length field does not include the |
| 755 | * terminating NULL, add 1 |
| 756 | */ |
| 757 | temp_size_needed += ((acpi_size) |
| 758 | (*sub_object_list)->string. |
| 759 | length + 1); |
| 760 | } else { |
| 761 | temp_size_needed += |
| 762 | acpi_ns_get_pathname_length((*sub_object_list)->reference.node); |
| 763 | } |
| 764 | } else { |
| 765 | /* |
| 766 | * If no name was found, then this is a NULL, which is |
| 767 | * translated as a u32 zero. |
| 768 | */ |
| 769 | temp_size_needed += sizeof(u32); |
| 770 | } |
| 771 | |
| 772 | /* Round up the size since each element must be aligned */ |
| 773 | |
| 774 | temp_size_needed = ACPI_ROUND_UP_to_64_bITS(temp_size_needed); |
| 775 | |
| 776 | /* Point to the next union acpi_operand_object */ |
| 777 | |
| 778 | top_object_list++; |
| 779 | } |
| 780 | |
| 781 | /* |
| 782 | * Adding an extra element to the end of the list, essentially a |
| 783 | * NULL terminator |
| 784 | */ |
| 785 | *buffer_size_needed = |
| 786 | temp_size_needed + sizeof(struct acpi_pci_routing_table); |
| 787 | return_ACPI_STATUS(AE_OK); |
| 788 | } |