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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: rscalc - Calculate stream and list lengths | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | |
4be44fcd | 50 | ACPI_MODULE_NAME("rscalc") |
1da177e4 | 51 | |
bda663d3 | 52 | /* Local prototypes */ |
bda663d3 RM |
53 | static u8 acpi_rs_count_set_bits(u16 bit_field); |
54 | ||
0897831b | 55 | static acpi_rs_length |
bda663d3 RM |
56 | acpi_rs_struct_option_length(struct acpi_resource_source *resource_source); |
57 | ||
58 | static u32 | |
59 | acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length); | |
60 | ||
1da177e4 LT |
61 | /******************************************************************************* |
62 | * | |
bda663d3 | 63 | * FUNCTION: acpi_rs_count_set_bits |
1da177e4 | 64 | * |
bda663d3 | 65 | * PARAMETERS: bit_field - Field in which to count bits |
1da177e4 | 66 | * |
bda663d3 | 67 | * RETURN: Number of bits set within the field |
1da177e4 | 68 | * |
bda663d3 RM |
69 | * DESCRIPTION: Count the number of bits set in a resource field. Used for |
70 | * (Short descriptor) interrupt and DMA lists. | |
1da177e4 LT |
71 | * |
72 | ******************************************************************************/ | |
1da177e4 | 73 | |
bda663d3 RM |
74 | static u8 acpi_rs_count_set_bits(u16 bit_field) |
75 | { | |
76 | u8 bits_set; | |
44f6c012 | 77 | |
bda663d3 | 78 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 79 | |
bda663d3 RM |
80 | for (bits_set = 0; bit_field; bits_set++) { |
81 | /* Zero the least significant bit that is set */ | |
1da177e4 | 82 | |
bda663d3 RM |
83 | bit_field &= (bit_field - 1); |
84 | } | |
1da177e4 | 85 | |
bda663d3 RM |
86 | return (bits_set); |
87 | } | |
1da177e4 | 88 | |
1da177e4 LT |
89 | /******************************************************************************* |
90 | * | |
bda663d3 | 91 | * FUNCTION: acpi_rs_struct_option_length |
1da177e4 | 92 | * |
bda663d3 | 93 | * PARAMETERS: resource_source - Pointer to optional descriptor field |
1da177e4 LT |
94 | * |
95 | * RETURN: Status | |
96 | * | |
bda663d3 RM |
97 | * DESCRIPTION: Common code to handle optional resource_source_index and |
98 | * resource_source fields in some Large descriptors. Used during | |
99 | * list-to-stream conversion | |
1da177e4 LT |
100 | * |
101 | ******************************************************************************/ | |
102 | ||
0897831b | 103 | static acpi_rs_length |
bda663d3 | 104 | acpi_rs_struct_option_length(struct acpi_resource_source *resource_source) |
1da177e4 | 105 | { |
bda663d3 RM |
106 | ACPI_FUNCTION_ENTRY(); |
107 | ||
108 | /* | |
109 | * If the resource_source string is valid, return the size of the string | |
110 | * (string_length includes the NULL terminator) plus the size of the | |
111 | * resource_source_index (1). | |
112 | */ | |
113 | if (resource_source->string_ptr) { | |
0897831b | 114 | return ((acpi_rs_length) (resource_source->string_length + 1)); |
bda663d3 | 115 | } |
1da177e4 | 116 | |
bda663d3 RM |
117 | return (0); |
118 | } | |
1da177e4 | 119 | |
bda663d3 RM |
120 | /******************************************************************************* |
121 | * | |
122 | * FUNCTION: acpi_rs_stream_option_length | |
123 | * | |
124 | * PARAMETERS: resource_length - Length from the resource header | |
125 | * minimum_total_length - Minimum length of this resource, before | |
126 | * any optional fields. Includes header size | |
127 | * | |
128 | * RETURN: Length of optional string (0 if no string present) | |
129 | * | |
130 | * DESCRIPTION: Common code to handle optional resource_source_index and | |
131 | * resource_source fields in some Large descriptors. Used during | |
132 | * stream-to-list conversion | |
133 | * | |
134 | ******************************************************************************/ | |
1da177e4 | 135 | |
bda663d3 | 136 | static u32 |
50eca3eb BM |
137 | acpi_rs_stream_option_length(u32 resource_length, |
138 | u32 minimum_aml_resource_length) | |
bda663d3 RM |
139 | { |
140 | u32 string_length = 0; | |
1da177e4 | 141 | |
bda663d3 | 142 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 143 | |
bda663d3 RM |
144 | /* |
145 | * The resource_source_index and resource_source are optional elements of some | |
146 | * Large-type resource descriptors. | |
147 | */ | |
44f6c012 | 148 | |
bda663d3 RM |
149 | /* |
150 | * If the length of the actual resource descriptor is greater than the ACPI | |
151 | * spec-defined minimum length, it means that a resource_source_index exists | |
152 | * and is followed by a (required) null terminated string. The string length | |
153 | * (including the null terminator) is the resource length minus the minimum | |
154 | * length, minus one byte for the resource_source_index itself. | |
155 | */ | |
50eca3eb | 156 | if (resource_length > minimum_aml_resource_length) { |
bda663d3 | 157 | /* Compute the length of the optional string */ |
1da177e4 | 158 | |
50eca3eb BM |
159 | string_length = |
160 | resource_length - minimum_aml_resource_length - 1; | |
bda663d3 | 161 | } |
1da177e4 | 162 | |
bda663d3 | 163 | /* Round up length to 32 bits for internal structure alignment */ |
1da177e4 | 164 | |
bda663d3 RM |
165 | return (ACPI_ROUND_UP_to_32_bITS(string_length)); |
166 | } | |
1da177e4 | 167 | |
bda663d3 RM |
168 | /******************************************************************************* |
169 | * | |
50eca3eb | 170 | * FUNCTION: acpi_rs_get_aml_length |
bda663d3 RM |
171 | * |
172 | * PARAMETERS: Resource - Pointer to the resource linked list | |
173 | * size_needed - Where the required size is returned | |
174 | * | |
175 | * RETURN: Status | |
176 | * | |
177 | * DESCRIPTION: Takes a linked list of internal resource descriptors and | |
178 | * calculates the size buffer needed to hold the corresponding | |
179 | * external resource byte stream. | |
180 | * | |
181 | ******************************************************************************/ | |
1da177e4 | 182 | |
bda663d3 | 183 | acpi_status |
50eca3eb | 184 | acpi_rs_get_aml_length(struct acpi_resource * resource, acpi_size * size_needed) |
bda663d3 | 185 | { |
50eca3eb | 186 | acpi_size aml_size_needed = 0; |
0897831b | 187 | acpi_rs_length total_size; |
1da177e4 | 188 | |
50eca3eb | 189 | ACPI_FUNCTION_TRACE("rs_get_aml_length"); |
1da177e4 | 190 | |
bda663d3 | 191 | /* Traverse entire list of internal resource descriptors */ |
1da177e4 | 192 | |
bda663d3 RM |
193 | while (resource) { |
194 | /* Validate the descriptor type */ | |
1da177e4 | 195 | |
50eca3eb | 196 | if (resource->type > ACPI_RESOURCE_TYPE_MAX) { |
bda663d3 RM |
197 | return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); |
198 | } | |
44f6c012 | 199 | |
bda663d3 | 200 | /* Get the base size of the (external stream) resource descriptor */ |
1da177e4 | 201 | |
0897831b | 202 | total_size = acpi_gbl_aml_resource_sizes[resource->type]; |
1da177e4 | 203 | |
bda663d3 RM |
204 | /* |
205 | * Augment the base size for descriptors with optional and/or | |
206 | * variable-length fields | |
207 | */ | |
208 | switch (resource->type) { | |
50eca3eb | 209 | case ACPI_RESOURCE_TYPE_VENDOR: |
1da177e4 | 210 | /* |
bda663d3 RM |
211 | * Vendor Defined Resource: |
212 | * For a Vendor Specific resource, if the Length is between 1 and 7 | |
213 | * it will be created as a Small Resource data type, otherwise it | |
214 | * is a Large Resource data type. | |
1da177e4 | 215 | */ |
50eca3eb | 216 | if (resource->data.vendor.byte_length > 7) { |
bda663d3 | 217 | /* Base size of a Large resource descriptor */ |
1da177e4 | 218 | |
0897831b | 219 | total_size = |
50eca3eb | 220 | sizeof(struct aml_resource_large_header); |
1da177e4 LT |
221 | } |
222 | ||
bda663d3 | 223 | /* Add the size of the vendor-specific data */ |
44f6c012 | 224 | |
0897831b BM |
225 | total_size = (acpi_rs_length) |
226 | (total_size + resource->data.vendor.byte_length); | |
1da177e4 LT |
227 | break; |
228 | ||
50eca3eb | 229 | case ACPI_RESOURCE_TYPE_END_TAG: |
1da177e4 | 230 | /* |
bda663d3 RM |
231 | * End Tag: |
232 | * We are done -- return the accumulated total size. | |
1da177e4 | 233 | */ |
0897831b | 234 | *size_needed = aml_size_needed + total_size; |
1da177e4 | 235 | |
bda663d3 | 236 | /* Normal exit */ |
1da177e4 | 237 | |
bda663d3 | 238 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 239 | |
50eca3eb | 240 | case ACPI_RESOURCE_TYPE_ADDRESS16: |
1da177e4 | 241 | /* |
bda663d3 RM |
242 | * 16-Bit Address Resource: |
243 | * Add the size of the optional resource_source info | |
1da177e4 | 244 | */ |
0897831b BM |
245 | total_size = (acpi_rs_length) |
246 | (total_size + | |
247 | acpi_rs_struct_option_length(&resource->data. | |
248 | address16. | |
249 | resource_source)); | |
1da177e4 LT |
250 | break; |
251 | ||
50eca3eb | 252 | case ACPI_RESOURCE_TYPE_ADDRESS32: |
1da177e4 | 253 | /* |
bda663d3 RM |
254 | * 32-Bit Address Resource: |
255 | * Add the size of the optional resource_source info | |
1da177e4 | 256 | */ |
0897831b BM |
257 | total_size = (acpi_rs_length) |
258 | (total_size + | |
259 | acpi_rs_struct_option_length(&resource->data. | |
260 | address32. | |
261 | resource_source)); | |
1da177e4 LT |
262 | break; |
263 | ||
50eca3eb | 264 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
1da177e4 | 265 | /* |
bda663d3 RM |
266 | * 64-Bit Address Resource: |
267 | * Add the size of the optional resource_source info | |
1da177e4 | 268 | */ |
0897831b BM |
269 | total_size = (acpi_rs_length) |
270 | (total_size + | |
271 | acpi_rs_struct_option_length(&resource->data. | |
272 | address64. | |
273 | resource_source)); | |
1da177e4 LT |
274 | break; |
275 | ||
50eca3eb | 276 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
1da177e4 | 277 | /* |
bda663d3 RM |
278 | * Extended IRQ Resource: |
279 | * Add the size of each additional optional interrupt beyond the | |
280 | * required 1 (4 bytes for each u32 interrupt number) | |
1da177e4 | 281 | */ |
0897831b BM |
282 | total_size = (acpi_rs_length) |
283 | (total_size + | |
284 | ((resource->data.extended_irq.interrupt_count - | |
285 | 1) * 4) + | |
286 | /* Add the size of the optional resource_source info */ | |
287 | acpi_rs_struct_option_length(&resource->data. | |
288 | extended_irq. | |
289 | resource_source)); | |
bda663d3 | 290 | break; |
1da177e4 | 291 | |
bda663d3 | 292 | default: |
1da177e4 | 293 | break; |
bda663d3 | 294 | } |
1da177e4 | 295 | |
bda663d3 | 296 | /* Update the total */ |
1da177e4 | 297 | |
0897831b | 298 | aml_size_needed += total_size; |
1da177e4 | 299 | |
bda663d3 | 300 | /* Point to the next object */ |
1da177e4 | 301 | |
96db255c | 302 | resource = |
c51a4de8 | 303 | ACPI_ADD_PTR(struct acpi_resource, resource, |
96db255c | 304 | resource->length); |
bda663d3 | 305 | } |
1da177e4 | 306 | |
96db255c | 307 | /* Did not find an end_tag resource descriptor */ |
1da177e4 | 308 | |
96db255c | 309 | return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); |
bda663d3 | 310 | } |
1da177e4 | 311 | |
bda663d3 RM |
312 | /******************************************************************************* |
313 | * | |
314 | * FUNCTION: acpi_rs_get_list_length | |
315 | * | |
50eca3eb BM |
316 | * PARAMETERS: aml_buffer - Pointer to the resource byte stream |
317 | * aml_buffer_length - Size of aml_buffer | |
318 | * size_needed - Where the size needed is returned | |
bda663d3 RM |
319 | * |
320 | * RETURN: Status | |
321 | * | |
322 | * DESCRIPTION: Takes an external resource byte stream and calculates the size | |
323 | * buffer needed to hold the corresponding internal resource | |
324 | * descriptor linked list. | |
325 | * | |
326 | ******************************************************************************/ | |
327 | ||
328 | acpi_status | |
50eca3eb BM |
329 | acpi_rs_get_list_length(u8 * aml_buffer, |
330 | u32 aml_buffer_length, acpi_size * size_needed) | |
bda663d3 | 331 | { |
96db255c BM |
332 | acpi_status status; |
333 | u8 *end_aml; | |
bda663d3 | 334 | u8 *buffer; |
bda663d3 | 335 | u32 buffer_size = 0; |
bda663d3 RM |
336 | u16 temp16; |
337 | u16 resource_length; | |
bda663d3 | 338 | u32 extra_struct_bytes; |
96db255c BM |
339 | u8 resource_index; |
340 | u8 minimum_aml_resource_length; | |
1da177e4 | 341 | |
bda663d3 | 342 | ACPI_FUNCTION_TRACE("rs_get_list_length"); |
1da177e4 | 343 | |
96db255c | 344 | end_aml = aml_buffer + aml_buffer_length; |
44f6c012 | 345 | |
96db255c | 346 | /* Walk the list of AML resource descriptors */ |
1da177e4 | 347 | |
96db255c BM |
348 | while (aml_buffer < end_aml) { |
349 | /* Validate the Resource Type and Resource Length */ | |
1da177e4 | 350 | |
96db255c BM |
351 | status = acpi_ut_validate_resource(aml_buffer, &resource_index); |
352 | if (ACPI_FAILURE(status)) { | |
353 | return_ACPI_STATUS(status); | |
1da177e4 LT |
354 | } |
355 | ||
96db255c | 356 | /* Get the resource length and base (minimum) AML size */ |
bda663d3 | 357 | |
0897831b | 358 | resource_length = acpi_ut_get_resource_length(aml_buffer); |
96db255c BM |
359 | minimum_aml_resource_length = |
360 | acpi_gbl_resource_aml_sizes[resource_index]; | |
bda663d3 | 361 | |
96db255c BM |
362 | /* |
363 | * Augment the size for descriptors with optional | |
364 | * and/or variable length fields | |
365 | */ | |
bda663d3 | 366 | extra_struct_bytes = 0; |
96db255c BM |
367 | buffer = |
368 | aml_buffer + acpi_ut_get_resource_header_length(aml_buffer); | |
bda663d3 | 369 | |
96db255c BM |
370 | switch (acpi_ut_get_resource_type(aml_buffer)) { |
371 | case ACPI_RESOURCE_NAME_IRQ: | |
bda663d3 | 372 | /* |
96db255c BM |
373 | * IRQ Resource: |
374 | * Get the number of bits set in the 16-bit IRQ mask | |
bda663d3 | 375 | */ |
96db255c | 376 | ACPI_MOVE_16_TO_16(&temp16, buffer); |
c51a4de8 | 377 | extra_struct_bytes = acpi_rs_count_set_bits(temp16); |
96db255c BM |
378 | break; |
379 | ||
380 | case ACPI_RESOURCE_NAME_DMA: | |
bda663d3 | 381 | /* |
96db255c BM |
382 | * DMA Resource: |
383 | * Get the number of bits set in the 8-bit DMA mask | |
bda663d3 | 384 | */ |
c51a4de8 | 385 | extra_struct_bytes = acpi_rs_count_set_bits(*buffer); |
96db255c BM |
386 | break; |
387 | ||
388 | case ACPI_RESOURCE_NAME_VENDOR_SMALL: | |
389 | /* | |
390 | * Vendor Resource: | |
391 | * Ensure a 32-bit boundary for the structure | |
392 | */ | |
393 | extra_struct_bytes = | |
46358614 LB |
394 | ACPI_ROUND_UP_to_32_bITS(resource_length) - |
395 | resource_length; | |
96db255c BM |
396 | break; |
397 | ||
398 | case ACPI_RESOURCE_NAME_END_TAG: | |
399 | /* | |
c51a4de8 | 400 | * End Tag: This is the normal exit, add size of end_tag |
96db255c | 401 | */ |
c51a4de8 | 402 | *size_needed = buffer_size + ACPI_RS_SIZE_MIN; |
96db255c BM |
403 | return_ACPI_STATUS(AE_OK); |
404 | ||
405 | case ACPI_RESOURCE_NAME_VENDOR_LARGE: | |
406 | /* | |
407 | * Vendor Resource: | |
408 | * Add vendor data and ensure a 32-bit boundary for the structure | |
409 | */ | |
410 | extra_struct_bytes = | |
46358614 LB |
411 | ACPI_ROUND_UP_to_32_bITS(resource_length) - |
412 | resource_length; | |
96db255c BM |
413 | break; |
414 | ||
415 | case ACPI_RESOURCE_NAME_ADDRESS32: | |
416 | case ACPI_RESOURCE_NAME_ADDRESS16: | |
417 | /* | |
418 | * 32-Bit or 16-bit Address Resource: | |
419 | * Add the size of any optional data (resource_source) | |
420 | */ | |
421 | extra_struct_bytes = | |
422 | acpi_rs_stream_option_length(resource_length, | |
423 | minimum_aml_resource_length); | |
424 | break; | |
425 | ||
426 | case ACPI_RESOURCE_NAME_EXTENDED_IRQ: | |
427 | /* | |
428 | * Extended IRQ: | |
429 | * Point past the interrupt_vector_flags to get the | |
430 | * interrupt_table_length. | |
431 | */ | |
432 | buffer++; | |
433 | ||
434 | extra_struct_bytes = | |
435 | /* | |
436 | * Add 4 bytes for each additional interrupt. Note: at | |
437 | * least one interrupt is required and is included in | |
438 | * the minimum descriptor size | |
439 | */ | |
440 | ((*buffer - 1) * sizeof(u32)) + | |
441 | /* Add the size of any optional data (resource_source) */ | |
442 | acpi_rs_stream_option_length(resource_length - | |
443 | extra_struct_bytes, | |
444 | minimum_aml_resource_length); | |
445 | break; | |
446 | ||
447 | case ACPI_RESOURCE_NAME_ADDRESS64: | |
448 | /* | |
449 | * 64-Bit Address Resource: | |
450 | * Add the size of any optional data (resource_source) | |
451 | * Ensure a 64-bit boundary for the structure | |
452 | */ | |
453 | extra_struct_bytes = | |
454 | ACPI_ROUND_UP_to_64_bITS | |
455 | (acpi_rs_stream_option_length | |
456 | (resource_length, minimum_aml_resource_length)); | |
457 | break; | |
458 | ||
459 | default: | |
460 | break; | |
bda663d3 | 461 | } |
44f6c012 | 462 | |
bda663d3 | 463 | /* Update the required buffer size for the internal descriptor structs */ |
1da177e4 | 464 | |
96db255c BM |
465 | temp16 = (u16) (acpi_gbl_resource_struct_sizes[resource_index] + |
466 | extra_struct_bytes); | |
c51a4de8 | 467 | buffer_size += (u32) ACPI_ROUND_UP_TO_NATIVE_WORD(temp16); |
44f6c012 | 468 | |
bda663d3 | 469 | /* |
96db255c | 470 | * Point to the next resource within the stream |
bda663d3 RM |
471 | * using the size of the header plus the length contained in the header |
472 | */ | |
96db255c | 473 | aml_buffer += acpi_ut_get_descriptor_length(aml_buffer); |
1da177e4 LT |
474 | } |
475 | ||
96db255c | 476 | /* Did not find an end_tag resource descriptor */ |
44f6c012 | 477 | |
96db255c | 478 | return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); |
1da177e4 LT |
479 | } |
480 | ||
1da177e4 LT |
481 | /******************************************************************************* |
482 | * | |
483 | * FUNCTION: acpi_rs_get_pci_routing_table_length | |
484 | * | |
485 | * PARAMETERS: package_object - Pointer to the package object | |
486 | * buffer_size_needed - u32 pointer of the size buffer | |
487 | * needed to properly return the | |
488 | * parsed data | |
489 | * | |
490 | * RETURN: Status | |
491 | * | |
492 | * DESCRIPTION: Given a package representing a PCI routing table, this | |
493 | * calculates the size of the corresponding linked list of | |
494 | * descriptions. | |
495 | * | |
496 | ******************************************************************************/ | |
497 | ||
498 | acpi_status | |
4be44fcd LB |
499 | acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object, |
500 | acpi_size * buffer_size_needed) | |
1da177e4 | 501 | { |
4be44fcd LB |
502 | u32 number_of_elements; |
503 | acpi_size temp_size_needed = 0; | |
504 | union acpi_operand_object **top_object_list; | |
505 | u32 index; | |
506 | union acpi_operand_object *package_element; | |
507 | union acpi_operand_object **sub_object_list; | |
508 | u8 name_found; | |
509 | u32 table_index; | |
1da177e4 | 510 | |
4be44fcd | 511 | ACPI_FUNCTION_TRACE("rs_get_pci_routing_table_length"); |
1da177e4 LT |
512 | |
513 | number_of_elements = package_object->package.count; | |
514 | ||
515 | /* | |
516 | * Calculate the size of the return buffer. | |
517 | * The base size is the number of elements * the sizes of the | |
518 | * structures. Additional space for the strings is added below. | |
519 | * The minus one is to subtract the size of the u8 Source[1] | |
520 | * member because it is added below. | |
521 | * | |
522 | * But each PRT_ENTRY structure has a pointer to a string and | |
523 | * the size of that string must be found. | |
524 | */ | |
525 | top_object_list = package_object->package.elements; | |
526 | ||
527 | for (index = 0; index < number_of_elements; index++) { | |
44f6c012 RM |
528 | /* Dereference the sub-package */ |
529 | ||
1da177e4 LT |
530 | package_element = *top_object_list; |
531 | ||
532 | /* | |
533 | * The sub_object_list will now point to an array of the | |
534 | * four IRQ elements: Address, Pin, Source and source_index | |
535 | */ | |
536 | sub_object_list = package_element->package.elements; | |
537 | ||
44f6c012 RM |
538 | /* Scan the irq_table_elements for the Source Name String */ |
539 | ||
1da177e4 LT |
540 | name_found = FALSE; |
541 | ||
4be44fcd LB |
542 | for (table_index = 0; table_index < 4 && !name_found; |
543 | table_index++) { | |
b8e4d893 BM |
544 | if (*sub_object_list && /* Null object allowed */ |
545 | ((ACPI_TYPE_STRING == | |
546 | ACPI_GET_OBJECT_TYPE(*sub_object_list)) || | |
547 | ((ACPI_TYPE_LOCAL_REFERENCE == | |
548 | ACPI_GET_OBJECT_TYPE(*sub_object_list)) && | |
549 | ((*sub_object_list)->reference.opcode == | |
550 | AML_INT_NAMEPATH_OP)))) { | |
1da177e4 | 551 | name_found = TRUE; |
4be44fcd | 552 | } else { |
44f6c012 RM |
553 | /* Look at the next element */ |
554 | ||
1da177e4 LT |
555 | sub_object_list++; |
556 | } | |
557 | } | |
558 | ||
4be44fcd | 559 | temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4); |
1da177e4 | 560 | |
44f6c012 RM |
561 | /* Was a String type found? */ |
562 | ||
1da177e4 | 563 | if (name_found) { |
4be44fcd LB |
564 | if (ACPI_GET_OBJECT_TYPE(*sub_object_list) == |
565 | ACPI_TYPE_STRING) { | |
1da177e4 LT |
566 | /* |
567 | * The length String.Length field does not include the | |
568 | * terminating NULL, add 1 | |
569 | */ | |
44f6c012 | 570 | temp_size_needed += ((acpi_size) |
4be44fcd LB |
571 | (*sub_object_list)->string. |
572 | length + 1); | |
573 | } else { | |
50eca3eb | 574 | temp_size_needed += acpi_ns_get_pathname_length((*sub_object_list)->reference.node); |
1da177e4 | 575 | } |
4be44fcd | 576 | } else { |
1da177e4 LT |
577 | /* |
578 | * If no name was found, then this is a NULL, which is | |
579 | * translated as a u32 zero. | |
580 | */ | |
4be44fcd | 581 | temp_size_needed += sizeof(u32); |
1da177e4 LT |
582 | } |
583 | ||
584 | /* Round up the size since each element must be aligned */ | |
585 | ||
4be44fcd | 586 | temp_size_needed = ACPI_ROUND_UP_to_64_bITS(temp_size_needed); |
1da177e4 | 587 | |
44f6c012 RM |
588 | /* Point to the next union acpi_operand_object */ |
589 | ||
1da177e4 LT |
590 | top_object_list++; |
591 | } | |
592 | ||
593 | /* | |
44f6c012 RM |
594 | * Adding an extra element to the end of the list, essentially a |
595 | * NULL terminator | |
1da177e4 | 596 | */ |
4be44fcd LB |
597 | *buffer_size_needed = |
598 | temp_size_needed + sizeof(struct acpi_pci_routing_table); | |
599 | return_ACPI_STATUS(AE_OK); | |
1da177e4 | 600 | } |