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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: rsirq - IRQ resource descriptors | |
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 | ||
45 | #include <acpi/acpi.h> | |
46 | #include <acpi/acresrc.h> | |
47 | ||
48 | #define _COMPONENT ACPI_RESOURCES | |
49 | ACPI_MODULE_NAME ("rsirq") | |
50 | ||
51 | ||
52 | /******************************************************************************* | |
53 | * | |
54 | * FUNCTION: acpi_rs_irq_resource | |
55 | * | |
56 | * PARAMETERS: byte_stream_buffer - Pointer to the resource input byte | |
57 | * stream | |
58 | * bytes_consumed - Pointer to where the number of bytes | |
59 | * consumed the byte_stream_buffer is | |
60 | * returned | |
61 | * output_buffer - Pointer to the return data buffer | |
62 | * structure_size - Pointer to where the number of bytes | |
63 | * in the return data struct is returned | |
64 | * | |
65 | * RETURN: Status | |
66 | * | |
67 | * DESCRIPTION: Take the resource byte stream and fill out the appropriate | |
68 | * structure pointed to by the output_buffer. Return the | |
69 | * number of bytes consumed from the byte stream. | |
70 | * | |
71 | ******************************************************************************/ | |
72 | ||
73 | acpi_status | |
74 | acpi_rs_irq_resource ( | |
75 | u8 *byte_stream_buffer, | |
76 | acpi_size *bytes_consumed, | |
77 | u8 **output_buffer, | |
78 | acpi_size *structure_size) | |
79 | { | |
80 | u8 *buffer = byte_stream_buffer; | |
81 | struct acpi_resource *output_struct = (void *) *output_buffer; | |
82 | u16 temp16 = 0; | |
83 | u8 temp8 = 0; | |
84 | u8 index; | |
85 | u8 i; | |
44f6c012 RM |
86 | acpi_size struct_size = ACPI_SIZEOF_RESOURCE ( |
87 | struct acpi_resource_irq); | |
1da177e4 LT |
88 | |
89 | ||
90 | ACPI_FUNCTION_TRACE ("rs_irq_resource"); | |
91 | ||
92 | ||
93 | /* | |
94 | * The number of bytes consumed are contained in the descriptor | |
44f6c012 | 95 | * (Bits:0-1) |
1da177e4 LT |
96 | */ |
97 | temp8 = *buffer; | |
98 | *bytes_consumed = (temp8 & 0x03) + 1; | |
99 | output_struct->id = ACPI_RSTYPE_IRQ; | |
100 | ||
44f6c012 RM |
101 | /* Point to the 16-bits of Bytes 1 and 2 */ |
102 | ||
1da177e4 LT |
103 | buffer += 1; |
104 | ACPI_MOVE_16_TO_16 (&temp16, buffer); | |
105 | ||
106 | output_struct->data.irq.number_of_interrupts = 0; | |
107 | ||
108 | /* Decode the IRQ bits */ | |
109 | ||
110 | for (i = 0, index = 0; index < 16; index++) { | |
111 | if ((temp16 >> index) & 0x01) { | |
112 | output_struct->data.irq.interrupts[i] = index; | |
113 | i++; | |
114 | } | |
115 | } | |
116 | ||
117 | /* Zero interrupts is valid */ | |
118 | ||
119 | output_struct->data.irq.number_of_interrupts = i; | |
120 | if (i > 0) { | |
44f6c012 RM |
121 | /* Calculate the structure size based upon the number of interrupts */ |
122 | ||
1da177e4 LT |
123 | struct_size += ((acpi_size) i - 1) * 4; |
124 | } | |
125 | ||
44f6c012 RM |
126 | /* Point to Byte 3 if it is used */ |
127 | ||
1da177e4 LT |
128 | if (4 == *bytes_consumed) { |
129 | buffer += 2; | |
130 | temp8 = *buffer; | |
131 | ||
44f6c012 RM |
132 | /* Check for HE, LL interrupts */ |
133 | ||
1da177e4 LT |
134 | switch (temp8 & 0x09) { |
135 | case 0x01: /* HE */ | |
136 | output_struct->data.irq.edge_level = ACPI_EDGE_SENSITIVE; | |
137 | output_struct->data.irq.active_high_low = ACPI_ACTIVE_HIGH; | |
138 | break; | |
139 | ||
140 | case 0x08: /* LL */ | |
141 | output_struct->data.irq.edge_level = ACPI_LEVEL_SENSITIVE; | |
142 | output_struct->data.irq.active_high_low = ACPI_ACTIVE_LOW; | |
143 | break; | |
144 | ||
145 | default: | |
146 | /* | |
147 | * Only _LL and _HE polarity/trigger interrupts | |
148 | * are allowed (ACPI spec, section "IRQ Format") | |
149 | * so 0x00 and 0x09 are illegal. | |
150 | */ | |
151 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
44f6c012 RM |
152 | "Invalid interrupt polarity/trigger in resource list, %X\n", |
153 | temp8)); | |
1da177e4 LT |
154 | return_ACPI_STATUS (AE_BAD_DATA); |
155 | } | |
156 | ||
44f6c012 RM |
157 | /* Check for sharable */ |
158 | ||
1da177e4 LT |
159 | output_struct->data.irq.shared_exclusive = (temp8 >> 3) & 0x01; |
160 | } | |
161 | else { | |
162 | /* | |
163 | * Assume Edge Sensitive, Active High, Non-Sharable | |
164 | * per ACPI Specification | |
165 | */ | |
166 | output_struct->data.irq.edge_level = ACPI_EDGE_SENSITIVE; | |
167 | output_struct->data.irq.active_high_low = ACPI_ACTIVE_HIGH; | |
168 | output_struct->data.irq.shared_exclusive = ACPI_EXCLUSIVE; | |
169 | } | |
170 | ||
44f6c012 RM |
171 | /* Set the Length parameter */ |
172 | ||
1da177e4 LT |
173 | output_struct->length = (u32) struct_size; |
174 | ||
44f6c012 RM |
175 | /* Return the final size of the structure */ |
176 | ||
1da177e4 LT |
177 | *structure_size = struct_size; |
178 | return_ACPI_STATUS (AE_OK); | |
179 | } | |
180 | ||
181 | ||
182 | /******************************************************************************* | |
183 | * | |
184 | * FUNCTION: acpi_rs_irq_stream | |
185 | * | |
186 | * PARAMETERS: linked_list - Pointer to the resource linked list | |
187 | * output_buffer - Pointer to the user's return buffer | |
188 | * bytes_consumed - Pointer to where the number of bytes | |
189 | * used in the output_buffer is returned | |
190 | * | |
191 | * RETURN: Status | |
192 | * | |
193 | * DESCRIPTION: Take the linked list resource structure and fills in the | |
194 | * the appropriate bytes in a byte stream | |
195 | * | |
196 | ******************************************************************************/ | |
197 | ||
198 | acpi_status | |
199 | acpi_rs_irq_stream ( | |
200 | struct acpi_resource *linked_list, | |
201 | u8 **output_buffer, | |
202 | acpi_size *bytes_consumed) | |
203 | { | |
204 | u8 *buffer = *output_buffer; | |
205 | u16 temp16 = 0; | |
206 | u8 temp8 = 0; | |
207 | u8 index; | |
208 | u8 IRqinfo_byte_needed; | |
209 | ||
210 | ||
211 | ACPI_FUNCTION_TRACE ("rs_irq_stream"); | |
212 | ||
213 | ||
214 | /* | |
215 | * The descriptor field is set based upon whether a third byte is | |
216 | * needed to contain the IRQ Information. | |
217 | */ | |
218 | if (ACPI_EDGE_SENSITIVE == linked_list->data.irq.edge_level && | |
219 | ACPI_ACTIVE_HIGH == linked_list->data.irq.active_high_low && | |
220 | ACPI_EXCLUSIVE == linked_list->data.irq.shared_exclusive) { | |
221 | *buffer = 0x22; | |
222 | IRqinfo_byte_needed = FALSE; | |
223 | } | |
224 | else { | |
225 | *buffer = 0x23; | |
226 | IRqinfo_byte_needed = TRUE; | |
227 | } | |
228 | ||
229 | buffer += 1; | |
230 | temp16 = 0; | |
231 | ||
44f6c012 RM |
232 | /* Loop through all of the interrupts and set the mask bits */ |
233 | ||
1da177e4 LT |
234 | for(index = 0; |
235 | index < linked_list->data.irq.number_of_interrupts; | |
236 | index++) { | |
237 | temp8 = (u8) linked_list->data.irq.interrupts[index]; | |
238 | temp16 |= 0x1 << temp8; | |
239 | } | |
240 | ||
241 | ACPI_MOVE_16_TO_16 (buffer, &temp16); | |
242 | buffer += 2; | |
243 | ||
44f6c012 RM |
244 | /* Set the IRQ Info byte if needed. */ |
245 | ||
1da177e4 LT |
246 | if (IRqinfo_byte_needed) { |
247 | temp8 = 0; | |
248 | temp8 = (u8) ((linked_list->data.irq.shared_exclusive & | |
249 | 0x01) << 4); | |
250 | ||
251 | if (ACPI_LEVEL_SENSITIVE == linked_list->data.irq.edge_level && | |
252 | ACPI_ACTIVE_LOW == linked_list->data.irq.active_high_low) { | |
253 | temp8 |= 0x08; | |
254 | } | |
255 | else { | |
256 | temp8 |= 0x01; | |
257 | } | |
258 | ||
259 | *buffer = temp8; | |
260 | buffer += 1; | |
261 | } | |
262 | ||
44f6c012 RM |
263 | /* Return the number of bytes consumed in this operation */ |
264 | ||
1da177e4 LT |
265 | *bytes_consumed = ACPI_PTR_DIFF (buffer, *output_buffer); |
266 | return_ACPI_STATUS (AE_OK); | |
267 | } | |
268 | ||
269 | ||
270 | /******************************************************************************* | |
271 | * | |
272 | * FUNCTION: acpi_rs_extended_irq_resource | |
273 | * | |
274 | * PARAMETERS: byte_stream_buffer - Pointer to the resource input byte | |
275 | * stream | |
276 | * bytes_consumed - Pointer to where the number of bytes | |
277 | * consumed the byte_stream_buffer is | |
278 | * returned | |
279 | * output_buffer - Pointer to the return data buffer | |
280 | * structure_size - Pointer to where the number of bytes | |
281 | * in the return data struct is returned | |
282 | * | |
283 | * RETURN: Status | |
284 | * | |
285 | * DESCRIPTION: Take the resource byte stream and fill out the appropriate | |
286 | * structure pointed to by the output_buffer. Return the | |
287 | * number of bytes consumed from the byte stream. | |
288 | * | |
289 | ******************************************************************************/ | |
290 | ||
291 | acpi_status | |
292 | acpi_rs_extended_irq_resource ( | |
293 | u8 *byte_stream_buffer, | |
294 | acpi_size *bytes_consumed, | |
295 | u8 **output_buffer, | |
296 | acpi_size *structure_size) | |
297 | { | |
298 | u8 *buffer = byte_stream_buffer; | |
299 | struct acpi_resource *output_struct = (void *) *output_buffer; | |
300 | u16 temp16 = 0; | |
301 | u8 temp8 = 0; | |
302 | u8 *temp_ptr; | |
303 | u8 index; | |
44f6c012 RM |
304 | acpi_size struct_size = ACPI_SIZEOF_RESOURCE ( |
305 | struct acpi_resource_ext_irq); | |
1da177e4 LT |
306 | |
307 | ||
308 | ACPI_FUNCTION_TRACE ("rs_extended_irq_resource"); | |
309 | ||
310 | ||
44f6c012 RM |
311 | /* Point past the Descriptor to get the number of bytes consumed */ |
312 | ||
1da177e4 LT |
313 | buffer += 1; |
314 | ACPI_MOVE_16_TO_16 (&temp16, buffer); | |
315 | ||
316 | /* Validate minimum descriptor length */ | |
317 | ||
318 | if (temp16 < 6) { | |
319 | return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH); | |
320 | } | |
321 | ||
322 | *bytes_consumed = temp16 + 3; | |
323 | output_struct->id = ACPI_RSTYPE_EXT_IRQ; | |
324 | ||
44f6c012 RM |
325 | /* Point to the Byte3 */ |
326 | ||
1da177e4 LT |
327 | buffer += 2; |
328 | temp8 = *buffer; | |
329 | ||
330 | output_struct->data.extended_irq.producer_consumer = temp8 & 0x01; | |
331 | ||
332 | /* | |
333 | * Check for Interrupt Mode | |
334 | * | |
335 | * The definition of an Extended IRQ changed between ACPI spec v1.0b | |
336 | * and ACPI spec 2.0 (section 6.4.3.6 in both). | |
337 | * | |
338 | * - Edge/Level are defined opposite in the table vs the headers | |
339 | */ | |
340 | output_struct->data.extended_irq.edge_level = | |
44f6c012 RM |
341 | (temp8 & 0x2) ? ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE; |
342 | ||
343 | /* Check Interrupt Polarity */ | |
1da177e4 | 344 | |
1da177e4 LT |
345 | output_struct->data.extended_irq.active_high_low = (temp8 >> 2) & 0x1; |
346 | ||
44f6c012 RM |
347 | /* Check for sharable */ |
348 | ||
1da177e4 LT |
349 | output_struct->data.extended_irq.shared_exclusive = (temp8 >> 3) & 0x01; |
350 | ||
44f6c012 RM |
351 | /* Point to Byte4 (IRQ Table length) */ |
352 | ||
1da177e4 LT |
353 | buffer += 1; |
354 | temp8 = *buffer; | |
355 | ||
356 | /* Must have at least one IRQ */ | |
357 | ||
358 | if (temp8 < 1) { | |
359 | return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH); | |
360 | } | |
361 | ||
362 | output_struct->data.extended_irq.number_of_interrupts = temp8; | |
363 | ||
364 | /* | |
365 | * Add any additional structure size to properly calculate | |
366 | * the next pointer at the end of this function | |
367 | */ | |
368 | struct_size += (temp8 - 1) * 4; | |
369 | ||
44f6c012 RM |
370 | /* Point to Byte5 (First IRQ Number) */ |
371 | ||
1da177e4 LT |
372 | buffer += 1; |
373 | ||
44f6c012 RM |
374 | /* Cycle through every IRQ in the table */ |
375 | ||
1da177e4 LT |
376 | for (index = 0; index < temp8; index++) { |
377 | ACPI_MOVE_32_TO_32 ( | |
378 | &output_struct->data.extended_irq.interrupts[index], buffer); | |
379 | ||
380 | /* Point to the next IRQ */ | |
381 | ||
382 | buffer += 4; | |
383 | } | |
384 | ||
385 | /* | |
386 | * This will leave us pointing to the Resource Source Index | |
387 | * If it is present, then save it off and calculate the | |
388 | * pointer to where the null terminated string goes: | |
389 | * Each Interrupt takes 32-bits + the 5 bytes of the | |
390 | * stream that are default. | |
391 | * | |
392 | * Note: Some resource descriptors will have an additional null, so | |
393 | * we add 1 to the length. | |
394 | */ | |
395 | if (*bytes_consumed > | |
44f6c012 RM |
396 | ((acpi_size) output_struct->data.extended_irq.number_of_interrupts * 4) + |
397 | (5 + 1)) { | |
1da177e4 LT |
398 | /* Dereference the Index */ |
399 | ||
400 | temp8 = *buffer; | |
401 | output_struct->data.extended_irq.resource_source.index = (u32) temp8; | |
402 | ||
403 | /* Point to the String */ | |
404 | ||
405 | buffer += 1; | |
406 | ||
44f6c012 RM |
407 | /* Point the String pointer to the end of this structure. */ |
408 | ||
1da177e4 LT |
409 | output_struct->data.extended_irq.resource_source.string_ptr = |
410 | (char *)((char *) output_struct + struct_size); | |
411 | ||
44f6c012 RM |
412 | temp_ptr = (u8 *) |
413 | output_struct->data.extended_irq.resource_source.string_ptr; | |
1da177e4 LT |
414 | |
415 | /* Copy the string into the buffer */ | |
416 | ||
417 | index = 0; | |
418 | while (0x00 != *buffer) { | |
419 | *temp_ptr = *buffer; | |
420 | ||
421 | temp_ptr += 1; | |
422 | buffer += 1; | |
423 | index += 1; | |
424 | } | |
425 | ||
44f6c012 RM |
426 | /* Add the terminating null */ |
427 | ||
1da177e4 LT |
428 | *temp_ptr = 0x00; |
429 | output_struct->data.extended_irq.resource_source.string_length = index + 1; | |
430 | ||
431 | /* | |
432 | * In order for the struct_size to fall on a 32-bit boundary, | |
433 | * calculate the length of the string and expand the | |
434 | * struct_size to the next 32-bit boundary. | |
435 | */ | |
436 | temp8 = (u8) (index + 1); | |
437 | struct_size += ACPI_ROUND_UP_to_32_bITS (temp8); | |
438 | } | |
439 | else { | |
440 | output_struct->data.extended_irq.resource_source.index = 0x00; | |
441 | output_struct->data.extended_irq.resource_source.string_length = 0; | |
442 | output_struct->data.extended_irq.resource_source.string_ptr = NULL; | |
443 | } | |
444 | ||
44f6c012 RM |
445 | /* Set the Length parameter */ |
446 | ||
1da177e4 LT |
447 | output_struct->length = (u32) struct_size; |
448 | ||
44f6c012 RM |
449 | /* Return the final size of the structure */ |
450 | ||
1da177e4 LT |
451 | *structure_size = struct_size; |
452 | return_ACPI_STATUS (AE_OK); | |
453 | } | |
454 | ||
455 | ||
456 | /******************************************************************************* | |
457 | * | |
458 | * FUNCTION: acpi_rs_extended_irq_stream | |
459 | * | |
460 | * PARAMETERS: linked_list - Pointer to the resource linked list | |
461 | * output_buffer - Pointer to the user's return buffer | |
462 | * bytes_consumed - Pointer to where the number of bytes | |
463 | * used in the output_buffer is returned | |
464 | * | |
465 | * RETURN: Status | |
466 | * | |
467 | * DESCRIPTION: Take the linked list resource structure and fills in the | |
468 | * the appropriate bytes in a byte stream | |
469 | * | |
470 | ******************************************************************************/ | |
471 | ||
472 | acpi_status | |
473 | acpi_rs_extended_irq_stream ( | |
474 | struct acpi_resource *linked_list, | |
475 | u8 **output_buffer, | |
476 | acpi_size *bytes_consumed) | |
477 | { | |
478 | u8 *buffer = *output_buffer; | |
479 | u16 *length_field; | |
480 | u8 temp8 = 0; | |
481 | u8 index; | |
482 | char *temp_pointer = NULL; | |
483 | ||
484 | ||
485 | ACPI_FUNCTION_TRACE ("rs_extended_irq_stream"); | |
486 | ||
487 | ||
44f6c012 RM |
488 | /* The descriptor field is static */ |
489 | ||
1da177e4 LT |
490 | *buffer = 0x89; |
491 | buffer += 1; | |
492 | ||
44f6c012 RM |
493 | /* Set a pointer to the Length field - to be filled in later */ |
494 | ||
1da177e4 LT |
495 | length_field = ACPI_CAST_PTR (u16, buffer); |
496 | buffer += 2; | |
497 | ||
44f6c012 RM |
498 | /* Set the Interrupt vector flags */ |
499 | ||
1da177e4 LT |
500 | temp8 = (u8)(linked_list->data.extended_irq.producer_consumer & 0x01); |
501 | temp8 |= ((linked_list->data.extended_irq.shared_exclusive & 0x01) << 3); | |
502 | ||
503 | /* | |
504 | * Set the Interrupt Mode | |
505 | * | |
506 | * The definition of an Extended IRQ changed between ACPI spec v1.0b | |
507 | * and ACPI spec 2.0 (section 6.4.3.6 in both). This code does not | |
508 | * implement the more restrictive definition of 1.0b | |
509 | * | |
510 | * - Edge/Level are defined opposite in the table vs the headers | |
511 | */ | |
512 | if (ACPI_EDGE_SENSITIVE == linked_list->data.extended_irq.edge_level) { | |
513 | temp8 |= 0x2; | |
514 | } | |
515 | ||
44f6c012 RM |
516 | /* Set the Interrupt Polarity */ |
517 | ||
1da177e4 LT |
518 | temp8 |= ((linked_list->data.extended_irq.active_high_low & 0x1) << 2); |
519 | ||
520 | *buffer = temp8; | |
521 | buffer += 1; | |
522 | ||
44f6c012 RM |
523 | /* Set the Interrupt table length */ |
524 | ||
1da177e4 LT |
525 | temp8 = (u8) linked_list->data.extended_irq.number_of_interrupts; |
526 | ||
527 | *buffer = temp8; | |
528 | buffer += 1; | |
529 | ||
530 | for (index = 0; index < linked_list->data.extended_irq.number_of_interrupts; | |
531 | index++) { | |
532 | ACPI_MOVE_32_TO_32 (buffer, | |
533 | &linked_list->data.extended_irq.interrupts[index]); | |
534 | buffer += 4; | |
535 | } | |
536 | ||
44f6c012 RM |
537 | /* Resource Source Index and Resource Source are optional */ |
538 | ||
1da177e4 LT |
539 | if (0 != linked_list->data.extended_irq.resource_source.string_length) { |
540 | *buffer = (u8) linked_list->data.extended_irq.resource_source.index; | |
541 | buffer += 1; | |
542 | ||
543 | temp_pointer = (char *) buffer; | |
544 | ||
44f6c012 RM |
545 | /* Copy the string */ |
546 | ||
1da177e4 LT |
547 | ACPI_STRCPY (temp_pointer, |
548 | linked_list->data.extended_irq.resource_source.string_ptr); | |
549 | ||
550 | /* | |
551 | * Buffer needs to be set to the length of the sting + one for the | |
552 | * terminating null | |
553 | */ | |
44f6c012 RM |
554 | buffer += (acpi_size) (ACPI_STRLEN ( |
555 | linked_list->data.extended_irq.resource_source.string_ptr) + 1); | |
1da177e4 LT |
556 | } |
557 | ||
44f6c012 RM |
558 | /* Return the number of bytes consumed in this operation */ |
559 | ||
1da177e4 LT |
560 | *bytes_consumed = ACPI_PTR_DIFF (buffer, *output_buffer); |
561 | ||
562 | /* | |
563 | * Set the length field to the number of bytes consumed | |
564 | * minus the header size (3 bytes) | |
565 | */ | |
566 | *length_field = (u16) (*bytes_consumed - 3); | |
567 | return_ACPI_STATUS (AE_OK); | |
568 | } | |
569 |