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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 | 80 | for (bits_set = 0; bit_field; bits_set++) { |
52fc0b02 | 81 | |
bda663d3 | 82 | /* Zero the least significant bit that is set */ |
1da177e4 | 83 | |
bda663d3 RM |
84 | bit_field &= (bit_field - 1); |
85 | } | |
1da177e4 | 86 | |
bda663d3 RM |
87 | return (bits_set); |
88 | } | |
1da177e4 | 89 | |
1da177e4 LT |
90 | /******************************************************************************* |
91 | * | |
bda663d3 | 92 | * FUNCTION: acpi_rs_struct_option_length |
1da177e4 | 93 | * |
bda663d3 | 94 | * PARAMETERS: resource_source - Pointer to optional descriptor field |
1da177e4 LT |
95 | * |
96 | * RETURN: Status | |
97 | * | |
bda663d3 RM |
98 | * DESCRIPTION: Common code to handle optional resource_source_index and |
99 | * resource_source fields in some Large descriptors. Used during | |
100 | * list-to-stream conversion | |
1da177e4 LT |
101 | * |
102 | ******************************************************************************/ | |
103 | ||
0897831b | 104 | static acpi_rs_length |
bda663d3 | 105 | acpi_rs_struct_option_length(struct acpi_resource_source *resource_source) |
1da177e4 | 106 | { |
bda663d3 RM |
107 | ACPI_FUNCTION_ENTRY(); |
108 | ||
109 | /* | |
110 | * If the resource_source string is valid, return the size of the string | |
111 | * (string_length includes the NULL terminator) plus the size of the | |
112 | * resource_source_index (1). | |
113 | */ | |
114 | if (resource_source->string_ptr) { | |
0897831b | 115 | return ((acpi_rs_length) (resource_source->string_length + 1)); |
bda663d3 | 116 | } |
1da177e4 | 117 | |
bda663d3 RM |
118 | return (0); |
119 | } | |
1da177e4 | 120 | |
bda663d3 RM |
121 | /******************************************************************************* |
122 | * | |
123 | * FUNCTION: acpi_rs_stream_option_length | |
124 | * | |
125 | * PARAMETERS: resource_length - Length from the resource header | |
126 | * minimum_total_length - Minimum length of this resource, before | |
127 | * any optional fields. Includes header size | |
128 | * | |
129 | * RETURN: Length of optional string (0 if no string present) | |
130 | * | |
131 | * DESCRIPTION: Common code to handle optional resource_source_index and | |
132 | * resource_source fields in some Large descriptors. Used during | |
133 | * stream-to-list conversion | |
134 | * | |
135 | ******************************************************************************/ | |
1da177e4 | 136 | |
bda663d3 | 137 | static u32 |
50eca3eb BM |
138 | acpi_rs_stream_option_length(u32 resource_length, |
139 | u32 minimum_aml_resource_length) | |
bda663d3 RM |
140 | { |
141 | u32 string_length = 0; | |
1da177e4 | 142 | |
bda663d3 | 143 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 144 | |
bda663d3 RM |
145 | /* |
146 | * The resource_source_index and resource_source are optional elements of some | |
147 | * Large-type resource descriptors. | |
148 | */ | |
44f6c012 | 149 | |
bda663d3 RM |
150 | /* |
151 | * If the length of the actual resource descriptor is greater than the ACPI | |
152 | * spec-defined minimum length, it means that a resource_source_index exists | |
153 | * and is followed by a (required) null terminated string. The string length | |
154 | * (including the null terminator) is the resource length minus the minimum | |
155 | * length, minus one byte for the resource_source_index itself. | |
156 | */ | |
50eca3eb | 157 | if (resource_length > minimum_aml_resource_length) { |
52fc0b02 | 158 | |
bda663d3 | 159 | /* Compute the length of the optional string */ |
1da177e4 | 160 | |
50eca3eb BM |
161 | string_length = |
162 | resource_length - minimum_aml_resource_length - 1; | |
bda663d3 | 163 | } |
1da177e4 | 164 | |
ea936b78 BM |
165 | /* |
166 | * Round the length up to a multiple of the native word in order to | |
167 | * guarantee that the entire resource descriptor is native word aligned | |
168 | */ | |
169 | return ((u32) ACPI_ROUND_UP_TO_NATIVE_WORD(string_length)); | |
bda663d3 | 170 | } |
1da177e4 | 171 | |
bda663d3 RM |
172 | /******************************************************************************* |
173 | * | |
50eca3eb | 174 | * FUNCTION: acpi_rs_get_aml_length |
bda663d3 RM |
175 | * |
176 | * PARAMETERS: Resource - Pointer to the resource linked list | |
177 | * size_needed - Where the required size is returned | |
178 | * | |
179 | * RETURN: Status | |
180 | * | |
181 | * DESCRIPTION: Takes a linked list of internal resource descriptors and | |
182 | * calculates the size buffer needed to hold the corresponding | |
183 | * external resource byte stream. | |
184 | * | |
185 | ******************************************************************************/ | |
1da177e4 | 186 | |
bda663d3 | 187 | acpi_status |
50eca3eb | 188 | acpi_rs_get_aml_length(struct acpi_resource * resource, acpi_size * size_needed) |
bda663d3 | 189 | { |
50eca3eb | 190 | acpi_size aml_size_needed = 0; |
0897831b | 191 | acpi_rs_length total_size; |
1da177e4 | 192 | |
b229cf92 | 193 | ACPI_FUNCTION_TRACE(rs_get_aml_length); |
1da177e4 | 194 | |
bda663d3 | 195 | /* Traverse entire list of internal resource descriptors */ |
1da177e4 | 196 | |
bda663d3 | 197 | while (resource) { |
52fc0b02 | 198 | |
bda663d3 | 199 | /* Validate the descriptor type */ |
1da177e4 | 200 | |
50eca3eb | 201 | if (resource->type > ACPI_RESOURCE_TYPE_MAX) { |
bda663d3 RM |
202 | return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); |
203 | } | |
44f6c012 | 204 | |
bda663d3 | 205 | /* Get the base size of the (external stream) resource descriptor */ |
1da177e4 | 206 | |
0897831b | 207 | total_size = acpi_gbl_aml_resource_sizes[resource->type]; |
1da177e4 | 208 | |
bda663d3 RM |
209 | /* |
210 | * Augment the base size for descriptors with optional and/or | |
211 | * variable-length fields | |
212 | */ | |
213 | switch (resource->type) { | |
50eca3eb | 214 | case ACPI_RESOURCE_TYPE_VENDOR: |
1da177e4 | 215 | /* |
bda663d3 RM |
216 | * Vendor Defined Resource: |
217 | * For a Vendor Specific resource, if the Length is between 1 and 7 | |
218 | * it will be created as a Small Resource data type, otherwise it | |
219 | * is a Large Resource data type. | |
1da177e4 | 220 | */ |
50eca3eb | 221 | if (resource->data.vendor.byte_length > 7) { |
52fc0b02 | 222 | |
bda663d3 | 223 | /* Base size of a Large resource descriptor */ |
1da177e4 | 224 | |
0897831b | 225 | total_size = |
50eca3eb | 226 | sizeof(struct aml_resource_large_header); |
1da177e4 LT |
227 | } |
228 | ||
bda663d3 | 229 | /* Add the size of the vendor-specific data */ |
44f6c012 | 230 | |
0897831b BM |
231 | total_size = (acpi_rs_length) |
232 | (total_size + resource->data.vendor.byte_length); | |
1da177e4 LT |
233 | break; |
234 | ||
50eca3eb | 235 | case ACPI_RESOURCE_TYPE_END_TAG: |
1da177e4 | 236 | /* |
bda663d3 RM |
237 | * End Tag: |
238 | * We are done -- return the accumulated total size. | |
1da177e4 | 239 | */ |
0897831b | 240 | *size_needed = aml_size_needed + total_size; |
1da177e4 | 241 | |
bda663d3 | 242 | /* Normal exit */ |
1da177e4 | 243 | |
bda663d3 | 244 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 245 | |
50eca3eb | 246 | case ACPI_RESOURCE_TYPE_ADDRESS16: |
1da177e4 | 247 | /* |
bda663d3 RM |
248 | * 16-Bit Address Resource: |
249 | * Add the size of the optional resource_source info | |
1da177e4 | 250 | */ |
0897831b BM |
251 | total_size = (acpi_rs_length) |
252 | (total_size + | |
253 | acpi_rs_struct_option_length(&resource->data. | |
254 | address16. | |
255 | resource_source)); | |
1da177e4 LT |
256 | break; |
257 | ||
50eca3eb | 258 | case ACPI_RESOURCE_TYPE_ADDRESS32: |
1da177e4 | 259 | /* |
bda663d3 RM |
260 | * 32-Bit Address Resource: |
261 | * Add the size of the optional resource_source info | |
1da177e4 | 262 | */ |
0897831b BM |
263 | total_size = (acpi_rs_length) |
264 | (total_size + | |
265 | acpi_rs_struct_option_length(&resource->data. | |
266 | address32. | |
267 | resource_source)); | |
1da177e4 LT |
268 | break; |
269 | ||
50eca3eb | 270 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
1da177e4 | 271 | /* |
bda663d3 RM |
272 | * 64-Bit Address Resource: |
273 | * Add the size of the optional resource_source info | |
1da177e4 | 274 | */ |
0897831b BM |
275 | total_size = (acpi_rs_length) |
276 | (total_size + | |
277 | acpi_rs_struct_option_length(&resource->data. | |
278 | address64. | |
279 | resource_source)); | |
1da177e4 LT |
280 | break; |
281 | ||
50eca3eb | 282 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
1da177e4 | 283 | /* |
bda663d3 RM |
284 | * Extended IRQ Resource: |
285 | * Add the size of each additional optional interrupt beyond the | |
286 | * required 1 (4 bytes for each u32 interrupt number) | |
1da177e4 | 287 | */ |
0897831b BM |
288 | total_size = (acpi_rs_length) |
289 | (total_size + | |
290 | ((resource->data.extended_irq.interrupt_count - | |
291 | 1) * 4) + | |
292 | /* Add the size of the optional resource_source info */ | |
293 | acpi_rs_struct_option_length(&resource->data. | |
294 | extended_irq. | |
295 | resource_source)); | |
bda663d3 | 296 | break; |
1da177e4 | 297 | |
bda663d3 | 298 | default: |
1da177e4 | 299 | break; |
bda663d3 | 300 | } |
1da177e4 | 301 | |
bda663d3 | 302 | /* Update the total */ |
1da177e4 | 303 | |
0897831b | 304 | aml_size_needed += total_size; |
1da177e4 | 305 | |
bda663d3 | 306 | /* Point to the next object */ |
1da177e4 | 307 | |
96db255c | 308 | resource = |
c51a4de8 | 309 | ACPI_ADD_PTR(struct acpi_resource, resource, |
96db255c | 310 | resource->length); |
bda663d3 | 311 | } |
1da177e4 | 312 | |
96db255c | 313 | /* Did not find an end_tag resource descriptor */ |
1da177e4 | 314 | |
96db255c | 315 | return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); |
bda663d3 | 316 | } |
1da177e4 | 317 | |
bda663d3 RM |
318 | /******************************************************************************* |
319 | * | |
320 | * FUNCTION: acpi_rs_get_list_length | |
321 | * | |
50eca3eb BM |
322 | * PARAMETERS: aml_buffer - Pointer to the resource byte stream |
323 | * aml_buffer_length - Size of aml_buffer | |
324 | * size_needed - Where the size needed is returned | |
bda663d3 RM |
325 | * |
326 | * RETURN: Status | |
327 | * | |
328 | * DESCRIPTION: Takes an external resource byte stream and calculates the size | |
329 | * buffer needed to hold the corresponding internal resource | |
330 | * descriptor linked list. | |
331 | * | |
332 | ******************************************************************************/ | |
333 | ||
334 | acpi_status | |
50eca3eb BM |
335 | acpi_rs_get_list_length(u8 * aml_buffer, |
336 | u32 aml_buffer_length, acpi_size * size_needed) | |
bda663d3 | 337 | { |
96db255c BM |
338 | acpi_status status; |
339 | u8 *end_aml; | |
bda663d3 | 340 | u8 *buffer; |
ea936b78 | 341 | u32 buffer_size; |
bda663d3 RM |
342 | u16 temp16; |
343 | u16 resource_length; | |
bda663d3 | 344 | u32 extra_struct_bytes; |
96db255c BM |
345 | u8 resource_index; |
346 | u8 minimum_aml_resource_length; | |
1da177e4 | 347 | |
b229cf92 | 348 | ACPI_FUNCTION_TRACE(rs_get_list_length); |
1da177e4 | 349 | |
ea936b78 | 350 | *size_needed = 0; |
96db255c | 351 | end_aml = aml_buffer + aml_buffer_length; |
44f6c012 | 352 | |
96db255c | 353 | /* Walk the list of AML resource descriptors */ |
1da177e4 | 354 | |
96db255c | 355 | while (aml_buffer < end_aml) { |
52fc0b02 | 356 | |
96db255c | 357 | /* Validate the Resource Type and Resource Length */ |
1da177e4 | 358 | |
96db255c BM |
359 | status = acpi_ut_validate_resource(aml_buffer, &resource_index); |
360 | if (ACPI_FAILURE(status)) { | |
361 | return_ACPI_STATUS(status); | |
1da177e4 LT |
362 | } |
363 | ||
96db255c | 364 | /* Get the resource length and base (minimum) AML size */ |
bda663d3 | 365 | |
0897831b | 366 | resource_length = acpi_ut_get_resource_length(aml_buffer); |
96db255c BM |
367 | minimum_aml_resource_length = |
368 | acpi_gbl_resource_aml_sizes[resource_index]; | |
bda663d3 | 369 | |
96db255c BM |
370 | /* |
371 | * Augment the size for descriptors with optional | |
372 | * and/or variable length fields | |
373 | */ | |
bda663d3 | 374 | extra_struct_bytes = 0; |
96db255c BM |
375 | buffer = |
376 | aml_buffer + acpi_ut_get_resource_header_length(aml_buffer); | |
bda663d3 | 377 | |
96db255c BM |
378 | switch (acpi_ut_get_resource_type(aml_buffer)) { |
379 | case ACPI_RESOURCE_NAME_IRQ: | |
bda663d3 | 380 | /* |
96db255c BM |
381 | * IRQ Resource: |
382 | * Get the number of bits set in the 16-bit IRQ mask | |
bda663d3 | 383 | */ |
96db255c | 384 | ACPI_MOVE_16_TO_16(&temp16, buffer); |
c51a4de8 | 385 | extra_struct_bytes = acpi_rs_count_set_bits(temp16); |
96db255c BM |
386 | break; |
387 | ||
388 | case ACPI_RESOURCE_NAME_DMA: | |
bda663d3 | 389 | /* |
96db255c BM |
390 | * DMA Resource: |
391 | * Get the number of bits set in the 8-bit DMA mask | |
bda663d3 | 392 | */ |
c51a4de8 | 393 | extra_struct_bytes = acpi_rs_count_set_bits(*buffer); |
96db255c BM |
394 | break; |
395 | ||
396 | case ACPI_RESOURCE_NAME_VENDOR_SMALL: | |
ea936b78 | 397 | case ACPI_RESOURCE_NAME_VENDOR_LARGE: |
96db255c BM |
398 | /* |
399 | * Vendor Resource: | |
ea936b78 | 400 | * Get the number of vendor data bytes |
96db255c | 401 | */ |
ea936b78 | 402 | extra_struct_bytes = resource_length; |
96db255c BM |
403 | break; |
404 | ||
405 | case ACPI_RESOURCE_NAME_END_TAG: | |
406 | /* | |
ea936b78 BM |
407 | * End Tag: |
408 | * This is the normal exit, add size of end_tag | |
96db255c | 409 | */ |
ea936b78 | 410 | *size_needed += ACPI_RS_SIZE_MIN; |
96db255c BM |
411 | return_ACPI_STATUS(AE_OK); |
412 | ||
96db255c BM |
413 | case ACPI_RESOURCE_NAME_ADDRESS32: |
414 | case ACPI_RESOURCE_NAME_ADDRESS16: | |
ea936b78 | 415 | case ACPI_RESOURCE_NAME_ADDRESS64: |
96db255c | 416 | /* |
ea936b78 BM |
417 | * Address Resource: |
418 | * Add the size of the optional resource_source | |
96db255c BM |
419 | */ |
420 | extra_struct_bytes = | |
421 | acpi_rs_stream_option_length(resource_length, | |
422 | minimum_aml_resource_length); | |
423 | break; | |
424 | ||
425 | case ACPI_RESOURCE_NAME_EXTENDED_IRQ: | |
426 | /* | |
ea936b78 BM |
427 | * Extended IRQ Resource: |
428 | * Using the interrupt_table_length, add 4 bytes for each additional | |
429 | * interrupt. Note: at least one interrupt is required and is | |
430 | * included in the minimum descriptor size (reason for the -1) | |
96db255c | 431 | */ |
ea936b78 BM |
432 | extra_struct_bytes = (buffer[1] - 1) * sizeof(u32); |
433 | ||
434 | /* Add the size of the optional resource_source */ | |
435 | ||
436 | extra_struct_bytes += | |
96db255c BM |
437 | acpi_rs_stream_option_length(resource_length - |
438 | extra_struct_bytes, | |
439 | minimum_aml_resource_length); | |
440 | break; | |
441 | ||
96db255c BM |
442 | default: |
443 | break; | |
bda663d3 | 444 | } |
44f6c012 | 445 | |
ea936b78 BM |
446 | /* |
447 | * Update the required buffer size for the internal descriptor structs | |
448 | * | |
449 | * Important: Round the size up for the appropriate alignment. This | |
450 | * is a requirement on IA64. | |
451 | */ | |
452 | buffer_size = acpi_gbl_resource_struct_sizes[resource_index] + | |
453 | extra_struct_bytes; | |
958dd242 | 454 | buffer_size = (u32) ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size); |
ea936b78 BM |
455 | |
456 | *size_needed += buffer_size; | |
1da177e4 | 457 | |
ea936b78 | 458 | ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, |
b229cf92 | 459 | "Type %.2X, AmlLength %.2X InternalLength %.2X\n", |
ea936b78 BM |
460 | acpi_ut_get_resource_type(aml_buffer), |
461 | acpi_ut_get_descriptor_length(aml_buffer), | |
462 | buffer_size)); | |
44f6c012 | 463 | |
bda663d3 | 464 | /* |
ea936b78 BM |
465 | * Point to the next resource within the AML stream using the length |
466 | * contained in the resource descriptor header | |
bda663d3 | 467 | */ |
96db255c | 468 | aml_buffer += acpi_ut_get_descriptor_length(aml_buffer); |
1da177e4 LT |
469 | } |
470 | ||
96db255c | 471 | /* Did not find an end_tag resource descriptor */ |
44f6c012 | 472 | |
96db255c | 473 | return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); |
1da177e4 LT |
474 | } |
475 | ||
1da177e4 LT |
476 | /******************************************************************************* |
477 | * | |
478 | * FUNCTION: acpi_rs_get_pci_routing_table_length | |
479 | * | |
480 | * PARAMETERS: package_object - Pointer to the package object | |
481 | * buffer_size_needed - u32 pointer of the size buffer | |
482 | * needed to properly return the | |
483 | * parsed data | |
484 | * | |
485 | * RETURN: Status | |
486 | * | |
487 | * DESCRIPTION: Given a package representing a PCI routing table, this | |
488 | * calculates the size of the corresponding linked list of | |
489 | * descriptions. | |
490 | * | |
491 | ******************************************************************************/ | |
492 | ||
493 | acpi_status | |
4be44fcd LB |
494 | acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object, |
495 | acpi_size * buffer_size_needed) | |
1da177e4 | 496 | { |
4be44fcd LB |
497 | u32 number_of_elements; |
498 | acpi_size temp_size_needed = 0; | |
499 | union acpi_operand_object **top_object_list; | |
500 | u32 index; | |
501 | union acpi_operand_object *package_element; | |
502 | union acpi_operand_object **sub_object_list; | |
503 | u8 name_found; | |
504 | u32 table_index; | |
1da177e4 | 505 | |
b229cf92 | 506 | ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length); |
1da177e4 LT |
507 | |
508 | number_of_elements = package_object->package.count; | |
509 | ||
510 | /* | |
511 | * Calculate the size of the return buffer. | |
512 | * The base size is the number of elements * the sizes of the | |
513 | * structures. Additional space for the strings is added below. | |
514 | * The minus one is to subtract the size of the u8 Source[1] | |
515 | * member because it is added below. | |
516 | * | |
517 | * But each PRT_ENTRY structure has a pointer to a string and | |
518 | * the size of that string must be found. | |
519 | */ | |
520 | top_object_list = package_object->package.elements; | |
521 | ||
522 | for (index = 0; index < number_of_elements; index++) { | |
52fc0b02 | 523 | |
44f6c012 RM |
524 | /* Dereference the sub-package */ |
525 | ||
1da177e4 LT |
526 | package_element = *top_object_list; |
527 | ||
528 | /* | |
529 | * The sub_object_list will now point to an array of the | |
530 | * four IRQ elements: Address, Pin, Source and source_index | |
531 | */ | |
532 | sub_object_list = package_element->package.elements; | |
533 | ||
44f6c012 RM |
534 | /* Scan the irq_table_elements for the Source Name String */ |
535 | ||
1da177e4 LT |
536 | name_found = FALSE; |
537 | ||
4be44fcd LB |
538 | for (table_index = 0; table_index < 4 && !name_found; |
539 | table_index++) { | |
b8e4d893 BM |
540 | if (*sub_object_list && /* Null object allowed */ |
541 | ((ACPI_TYPE_STRING == | |
542 | ACPI_GET_OBJECT_TYPE(*sub_object_list)) || | |
543 | ((ACPI_TYPE_LOCAL_REFERENCE == | |
544 | ACPI_GET_OBJECT_TYPE(*sub_object_list)) && | |
545 | ((*sub_object_list)->reference.opcode == | |
546 | AML_INT_NAMEPATH_OP)))) { | |
1da177e4 | 547 | name_found = TRUE; |
4be44fcd | 548 | } else { |
44f6c012 RM |
549 | /* Look at the next element */ |
550 | ||
1da177e4 LT |
551 | sub_object_list++; |
552 | } | |
553 | } | |
554 | ||
4be44fcd | 555 | temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4); |
1da177e4 | 556 | |
44f6c012 RM |
557 | /* Was a String type found? */ |
558 | ||
1da177e4 | 559 | if (name_found) { |
4be44fcd LB |
560 | if (ACPI_GET_OBJECT_TYPE(*sub_object_list) == |
561 | ACPI_TYPE_STRING) { | |
1da177e4 LT |
562 | /* |
563 | * The length String.Length field does not include the | |
564 | * terminating NULL, add 1 | |
565 | */ | |
44f6c012 | 566 | temp_size_needed += ((acpi_size) |
4be44fcd LB |
567 | (*sub_object_list)->string. |
568 | length + 1); | |
569 | } else { | |
50eca3eb | 570 | temp_size_needed += acpi_ns_get_pathname_length((*sub_object_list)->reference.node); |
1da177e4 | 571 | } |
4be44fcd | 572 | } else { |
1da177e4 LT |
573 | /* |
574 | * If no name was found, then this is a NULL, which is | |
575 | * translated as a u32 zero. | |
576 | */ | |
4be44fcd | 577 | temp_size_needed += sizeof(u32); |
1da177e4 LT |
578 | } |
579 | ||
580 | /* Round up the size since each element must be aligned */ | |
581 | ||
958dd242 | 582 | temp_size_needed = ACPI_ROUND_UP_TO_64BIT(temp_size_needed); |
1da177e4 | 583 | |
44f6c012 RM |
584 | /* Point to the next union acpi_operand_object */ |
585 | ||
1da177e4 LT |
586 | top_object_list++; |
587 | } | |
588 | ||
589 | /* | |
ea936b78 | 590 | * Add an extra element to the end of the list, essentially a |
44f6c012 | 591 | * NULL terminator |
1da177e4 | 592 | */ |
4be44fcd LB |
593 | *buffer_size_needed = |
594 | temp_size_needed + sizeof(struct acpi_pci_routing_table); | |
595 | return_ACPI_STATUS(AE_OK); | |
1da177e4 | 596 | } |