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-rw-r--r--drivers/acpi/resources/rsirq.c568
1 files changed, 123 insertions, 445 deletions
diff --git a/drivers/acpi/resources/rsirq.c b/drivers/acpi/resources/rsirq.c
index 56043fee96cb..1fa63bc2e36f 100644
--- a/drivers/acpi/resources/rsirq.c
+++ b/drivers/acpi/resources/rsirq.c
@@ -5,7 +5,7 @@
5 ******************************************************************************/ 5 ******************************************************************************/
6 6
7/* 7/*
8 * Copyright (C) 2000 - 2005, R. Byron Moore 8 * Copyright (C) 2000 - 2006, R. Byron Moore
9 * All rights reserved. 9 * All rights reserved.
10 * 10 *
11 * Redistribution and use in source and binary forms, with or without 11 * Redistribution and use in source and binary forms, with or without
@@ -49,504 +49,182 @@ ACPI_MODULE_NAME("rsirq")
49 49
50/******************************************************************************* 50/*******************************************************************************
51 * 51 *
52 * FUNCTION: acpi_rs_irq_resource 52 * acpi_rs_get_irq
53 *
54 * PARAMETERS: byte_stream_buffer - Pointer to the resource input byte
55 * stream
56 * bytes_consumed - Pointer to where the number of bytes
57 * consumed the byte_stream_buffer is
58 * returned
59 * output_buffer - Pointer to the return data buffer
60 * structure_size - Pointer to where the number of bytes
61 * in the return data struct is returned
62 *
63 * RETURN: Status
64 *
65 * DESCRIPTION: Take the resource byte stream and fill out the appropriate
66 * structure pointed to by the output_buffer. Return the
67 * number of bytes consumed from the byte stream.
68 * 53 *
69 ******************************************************************************/ 54 ******************************************************************************/
70acpi_status 55struct acpi_rsconvert_info acpi_rs_get_irq[7] = {
71acpi_rs_irq_resource(u8 * byte_stream_buffer, 56 {ACPI_RSC_INITGET, ACPI_RESOURCE_TYPE_IRQ,
72 acpi_size * bytes_consumed, 57 ACPI_RS_SIZE(struct acpi_resource_irq),
73 u8 ** output_buffer, acpi_size * structure_size) 58 ACPI_RSC_TABLE_SIZE(acpi_rs_get_irq)},
74{
75 u8 *buffer = byte_stream_buffer;
76 struct acpi_resource *output_struct = (void *)*output_buffer;
77 u16 temp16 = 0;
78 u8 temp8 = 0;
79 u8 index;
80 u8 i;
81 acpi_size struct_size = ACPI_SIZEOF_RESOURCE(struct acpi_resource_irq);
82
83 ACPI_FUNCTION_TRACE("rs_irq_resource");
84
85 /*
86 * The number of bytes consumed are contained in the descriptor
87 * (Bits:0-1)
88 */
89 temp8 = *buffer;
90 *bytes_consumed = (temp8 & 0x03) + 1;
91 output_struct->id = ACPI_RSTYPE_IRQ;
92
93 /* Point to the 16-bits of Bytes 1 and 2 */
94
95 buffer += 1;
96 ACPI_MOVE_16_TO_16(&temp16, buffer);
97
98 output_struct->data.irq.number_of_interrupts = 0;
99
100 /* Decode the IRQ bits */
101
102 for (i = 0, index = 0; index < 16; index++) {
103 if ((temp16 >> index) & 0x01) {
104 output_struct->data.irq.interrupts[i] = index;
105 i++;
106 }
107 }
108 59
109 /* Zero interrupts is valid */ 60 /* Get the IRQ mask (bytes 1:2) */
110 61
111 output_struct->data.irq.number_of_interrupts = i; 62 {ACPI_RSC_BITMASK16, ACPI_RS_OFFSET(data.irq.interrupts[0]),
112 if (i > 0) { 63 AML_OFFSET(irq.irq_mask),
113 /* Calculate the structure size based upon the number of interrupts */ 64 ACPI_RS_OFFSET(data.irq.interrupt_count)},
114 65
115 struct_size += ((acpi_size) i - 1) * 4; 66 /* Set default flags (others are zero) */
116 }
117 67
118 /* Point to Byte 3 if it is used */ 68 {ACPI_RSC_SET8, ACPI_RS_OFFSET(data.irq.triggering),
69 ACPI_EDGE_SENSITIVE,
70 1},
119 71
120 if (4 == *bytes_consumed) { 72 /* All done if no flag byte present in descriptor */
121 buffer += 2;
122 temp8 = *buffer;
123 73
124 /* Check for HE, LL interrupts */ 74 {ACPI_RSC_EXIT_NE, ACPI_RSC_COMPARE_AML_LENGTH, 0, 3},
125 75
126 switch (temp8 & 0x09) { 76 /* Get flags: Triggering[0], Polarity[3], Sharing[4] */
127 case 0x01: /* HE */
128 output_struct->data.irq.edge_level =
129 ACPI_EDGE_SENSITIVE;
130 output_struct->data.irq.active_high_low =
131 ACPI_ACTIVE_HIGH;
132 break;
133 77
134 case 0x08: /* LL */ 78 {ACPI_RSC_1BITFLAG, ACPI_RS_OFFSET(data.irq.triggering),
135 output_struct->data.irq.edge_level = 79 AML_OFFSET(irq.flags),
136 ACPI_LEVEL_SENSITIVE; 80 0},
137 output_struct->data.irq.active_high_low =
138 ACPI_ACTIVE_LOW;
139 break;
140 81
141 default: 82 {ACPI_RSC_1BITFLAG, ACPI_RS_OFFSET(data.irq.polarity),
142 /* 83 AML_OFFSET(irq.flags),
143 * Only _LL and _HE polarity/trigger interrupts 84 3},
144 * are allowed (ACPI spec, section "IRQ Format")
145 * so 0x00 and 0x09 are illegal.
146 */
147 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
148 "Invalid interrupt polarity/trigger in resource list, %X\n",
149 temp8));
150 return_ACPI_STATUS(AE_BAD_DATA);
151 }
152 85
153 /* Check for sharable */ 86 {ACPI_RSC_1BITFLAG, ACPI_RS_OFFSET(data.irq.sharable),
154 87 AML_OFFSET(irq.flags),
155 output_struct->data.irq.shared_exclusive = (temp8 >> 3) & 0x01; 88 4}
156 } else { 89};
157 /*
158 * Assume Edge Sensitive, Active High, Non-Sharable
159 * per ACPI Specification
160 */
161 output_struct->data.irq.edge_level = ACPI_EDGE_SENSITIVE;
162 output_struct->data.irq.active_high_low = ACPI_ACTIVE_HIGH;
163 output_struct->data.irq.shared_exclusive = ACPI_EXCLUSIVE;
164 }
165
166 /* Set the Length parameter */
167
168 output_struct->length = (u32) struct_size;
169
170 /* Return the final size of the structure */
171
172 *structure_size = struct_size;
173 return_ACPI_STATUS(AE_OK);
174}
175 90
176/******************************************************************************* 91/*******************************************************************************
177 * 92 *
178 * FUNCTION: acpi_rs_irq_stream 93 * acpi_rs_set_irq
179 *
180 * PARAMETERS: linked_list - Pointer to the resource linked list
181 * output_buffer - Pointer to the user's return buffer
182 * bytes_consumed - Pointer to where the number of bytes
183 * used in the output_buffer is returned
184 *
185 * RETURN: Status
186 *
187 * DESCRIPTION: Take the linked list resource structure and fills in the
188 * the appropriate bytes in a byte stream
189 * 94 *
190 ******************************************************************************/ 95 ******************************************************************************/
191 96
192acpi_status 97struct acpi_rsconvert_info acpi_rs_set_irq[9] = {
193acpi_rs_irq_stream(struct acpi_resource *linked_list, 98 {ACPI_RSC_INITSET, ACPI_RESOURCE_NAME_IRQ,
194 u8 ** output_buffer, acpi_size * bytes_consumed) 99 sizeof(struct aml_resource_irq),
195{ 100 ACPI_RSC_TABLE_SIZE(acpi_rs_set_irq)},
196 u8 *buffer = *output_buffer;
197 u16 temp16 = 0;
198 u8 temp8 = 0;
199 u8 index;
200 u8 IRqinfo_byte_needed;
201
202 ACPI_FUNCTION_TRACE("rs_irq_stream");
203
204 /*
205 * The descriptor field is set based upon whether a third byte is
206 * needed to contain the IRQ Information.
207 */
208 if (ACPI_EDGE_SENSITIVE == linked_list->data.irq.edge_level &&
209 ACPI_ACTIVE_HIGH == linked_list->data.irq.active_high_low &&
210 ACPI_EXCLUSIVE == linked_list->data.irq.shared_exclusive) {
211 *buffer = 0x22;
212 IRqinfo_byte_needed = FALSE;
213 } else {
214 *buffer = 0x23;
215 IRqinfo_byte_needed = TRUE;
216 }
217
218 buffer += 1;
219 temp16 = 0;
220
221 /* Loop through all of the interrupts and set the mask bits */
222
223 for (index = 0;
224 index < linked_list->data.irq.number_of_interrupts; index++) {
225 temp8 = (u8) linked_list->data.irq.interrupts[index];
226 temp16 |= 0x1 << temp8;
227 }
228
229 ACPI_MOVE_16_TO_16(buffer, &temp16);
230 buffer += 2;
231
232 /* Set the IRQ Info byte if needed. */
233
234 if (IRqinfo_byte_needed) {
235 temp8 = 0;
236 temp8 = (u8) ((linked_list->data.irq.shared_exclusive &
237 0x01) << 4);
238
239 if (ACPI_LEVEL_SENSITIVE == linked_list->data.irq.edge_level &&
240 ACPI_ACTIVE_LOW == linked_list->data.irq.active_high_low) {
241 temp8 |= 0x08;
242 } else {
243 temp8 |= 0x01;
244 }
245
246 *buffer = temp8;
247 buffer += 1;
248 }
249
250 /* Return the number of bytes consumed in this operation */
251
252 *bytes_consumed = ACPI_PTR_DIFF(buffer, *output_buffer);
253 return_ACPI_STATUS(AE_OK);
254}
255
256/*******************************************************************************
257 *
258 * FUNCTION: acpi_rs_extended_irq_resource
259 *
260 * PARAMETERS: byte_stream_buffer - Pointer to the resource input byte
261 * stream
262 * bytes_consumed - Pointer to where the number of bytes
263 * consumed the byte_stream_buffer is
264 * returned
265 * output_buffer - Pointer to the return data buffer
266 * structure_size - Pointer to where the number of bytes
267 * in the return data struct is returned
268 *
269 * RETURN: Status
270 *
271 * DESCRIPTION: Take the resource byte stream and fill out the appropriate
272 * structure pointed to by the output_buffer. Return the
273 * number of bytes consumed from the byte stream.
274 *
275 ******************************************************************************/
276
277acpi_status
278acpi_rs_extended_irq_resource(u8 * byte_stream_buffer,
279 acpi_size * bytes_consumed,
280 u8 ** output_buffer, acpi_size * structure_size)
281{
282 u8 *buffer = byte_stream_buffer;
283 struct acpi_resource *output_struct = (void *)*output_buffer;
284 u16 temp16 = 0;
285 u8 temp8 = 0;
286 u8 *temp_ptr;
287 u8 index;
288 acpi_size struct_size =
289 ACPI_SIZEOF_RESOURCE(struct acpi_resource_ext_irq);
290
291 ACPI_FUNCTION_TRACE("rs_extended_irq_resource");
292
293 /* Get the Descriptor Length field */
294
295 buffer += 1;
296 ACPI_MOVE_16_TO_16(&temp16, buffer);
297
298 /* Validate minimum descriptor length */
299
300 if (temp16 < 6) {
301 return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
302 }
303
304 *bytes_consumed = temp16 + 3;
305 output_struct->id = ACPI_RSTYPE_EXT_IRQ;
306
307 /* Point to the Byte3 */
308
309 buffer += 2;
310 temp8 = *buffer;
311
312 output_struct->data.extended_irq.producer_consumer = temp8 & 0x01;
313 101
314 /* 102 /* Convert interrupt list to 16-bit IRQ bitmask */
315 * Check for Interrupt Mode
316 *
317 * The definition of an Extended IRQ changed between ACPI spec v1.0b
318 * and ACPI spec 2.0 (section 6.4.3.6 in both).
319 *
320 * - Edge/Level are defined opposite in the table vs the headers
321 */
322 output_struct->data.extended_irq.edge_level =
323 (temp8 & 0x2) ? ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
324
325 /* Check Interrupt Polarity */
326
327 output_struct->data.extended_irq.active_high_low = (temp8 >> 2) & 0x1;
328
329 /* Check for sharable */
330
331 output_struct->data.extended_irq.shared_exclusive = (temp8 >> 3) & 0x01;
332 103
333 /* Point to Byte4 (IRQ Table length) */ 104 {ACPI_RSC_BITMASK16, ACPI_RS_OFFSET(data.irq.interrupts[0]),
105 AML_OFFSET(irq.irq_mask),
106 ACPI_RS_OFFSET(data.irq.interrupt_count)},
334 107
335 buffer += 1; 108 /* Set the flags byte by default */
336 temp8 = *buffer;
337 109
338 /* Must have at least one IRQ */ 110 {ACPI_RSC_1BITFLAG, ACPI_RS_OFFSET(data.irq.triggering),
111 AML_OFFSET(irq.flags),
112 0},
339 113
340 if (temp8 < 1) { 114 {ACPI_RSC_1BITFLAG, ACPI_RS_OFFSET(data.irq.polarity),
341 return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH); 115 AML_OFFSET(irq.flags),
342 } 116 3},
343
344 output_struct->data.extended_irq.number_of_interrupts = temp8;
345 117
118 {ACPI_RSC_1BITFLAG, ACPI_RS_OFFSET(data.irq.sharable),
119 AML_OFFSET(irq.flags),
120 4},
346 /* 121 /*
347 * Add any additional structure size to properly calculate 122 * Check if the flags byte is necessary. Not needed if the flags are:
348 * the next pointer at the end of this function 123 * ACPI_EDGE_SENSITIVE, ACPI_ACTIVE_HIGH, ACPI_EXCLUSIVE
349 */ 124 */
350 struct_size += (temp8 - 1) * 4; 125 {ACPI_RSC_EXIT_NE, ACPI_RSC_COMPARE_VALUE,
351 126 ACPI_RS_OFFSET(data.irq.triggering),
352 /* Point to Byte5 (First IRQ Number) */ 127 ACPI_EDGE_SENSITIVE},
353
354 buffer += 1;
355
356 /* Cycle through every IRQ in the table */
357
358 for (index = 0; index < temp8; index++) {
359 ACPI_MOVE_32_TO_32(&output_struct->data.extended_irq.
360 interrupts[index], buffer);
361
362 /* Point to the next IRQ */
363
364 buffer += 4;
365 }
366
367 /*
368 * This will leave us pointing to the Resource Source Index
369 * If it is present, then save it off and calculate the
370 * pointer to where the null terminated string goes:
371 * Each Interrupt takes 32-bits + the 5 bytes of the
372 * stream that are default.
373 *
374 * Note: Some resource descriptors will have an additional null, so
375 * we add 1 to the length.
376 */
377 if (*bytes_consumed >
378 ((acpi_size) output_struct->data.extended_irq.number_of_interrupts *
379 4) + (5 + 1)) {
380 /* Dereference the Index */
381
382 temp8 = *buffer;
383 output_struct->data.extended_irq.resource_source.index =
384 (u32) temp8;
385
386 /* Point to the String */
387
388 buffer += 1;
389
390 /* Point the String pointer to the end of this structure. */
391
392 output_struct->data.extended_irq.resource_source.string_ptr =
393 (char *)((char *)output_struct + struct_size);
394 128
395 temp_ptr = (u8 *) 129 {ACPI_RSC_EXIT_NE, ACPI_RSC_COMPARE_VALUE,
396 output_struct->data.extended_irq.resource_source.string_ptr; 130 ACPI_RS_OFFSET(data.irq.polarity),
131 ACPI_ACTIVE_HIGH},
397 132
398 /* Copy the string into the buffer */ 133 {ACPI_RSC_EXIT_NE, ACPI_RSC_COMPARE_VALUE,
134 ACPI_RS_OFFSET(data.irq.sharable),
135 ACPI_EXCLUSIVE},
399 136
400 index = 0; 137 /* irq_no_flags() descriptor can be used */
401 while (*buffer) {
402 *temp_ptr = *buffer;
403 138
404 temp_ptr += 1; 139 {ACPI_RSC_LENGTH, 0, 0, sizeof(struct aml_resource_irq_noflags)}
405 buffer += 1; 140};
406 index += 1;
407 }
408
409 /* Add the terminating null */
410
411 *temp_ptr = 0;
412 output_struct->data.extended_irq.resource_source.string_length =
413 index + 1;
414
415 /*
416 * In order for the struct_size to fall on a 32-bit boundary,
417 * calculate the length of the string and expand the
418 * struct_size to the next 32-bit boundary.
419 */
420 temp8 = (u8) (index + 1);
421 struct_size += ACPI_ROUND_UP_to_32_bITS(temp8);
422 } else {
423 output_struct->data.extended_irq.resource_source.index = 0;
424 output_struct->data.extended_irq.resource_source.string_length =
425 0;
426 output_struct->data.extended_irq.resource_source.string_ptr =
427 NULL;
428 }
429
430 /* Set the Length parameter */
431
432 output_struct->length = (u32) struct_size;
433
434 /* Return the final size of the structure */
435
436 *structure_size = struct_size;
437 return_ACPI_STATUS(AE_OK);
438}
439 141
440/******************************************************************************* 142/*******************************************************************************
441 * 143 *
442 * FUNCTION: acpi_rs_extended_irq_stream 144 * acpi_rs_convert_ext_irq
443 *
444 * PARAMETERS: linked_list - Pointer to the resource linked list
445 * output_buffer - Pointer to the user's return buffer
446 * bytes_consumed - Pointer to where the number of bytes
447 * used in the output_buffer is returned
448 *
449 * RETURN: Status
450 *
451 * DESCRIPTION: Take the linked list resource structure and fills in the
452 * the appropriate bytes in a byte stream
453 * 145 *
454 ******************************************************************************/ 146 ******************************************************************************/
455 147
456acpi_status 148struct acpi_rsconvert_info acpi_rs_convert_ext_irq[9] = {
457acpi_rs_extended_irq_stream(struct acpi_resource *linked_list, 149 {ACPI_RSC_INITGET, ACPI_RESOURCE_TYPE_EXTENDED_IRQ,
458 u8 ** output_buffer, acpi_size * bytes_consumed) 150 ACPI_RS_SIZE(struct acpi_resource_extended_irq),
459{ 151 ACPI_RSC_TABLE_SIZE(acpi_rs_convert_ext_irq)},
460 u8 *buffer = *output_buffer;
461 u16 *length_field;
462 u8 temp8 = 0;
463 u8 index;
464 152
465 ACPI_FUNCTION_TRACE("rs_extended_irq_stream"); 153 {ACPI_RSC_INITSET, ACPI_RESOURCE_NAME_EXTENDED_IRQ,
154 sizeof(struct aml_resource_extended_irq),
155 0},
466 156
467 /* Set the Descriptor Type field */ 157 /* Flag bits */
468 158
469 *buffer = ACPI_RDESC_TYPE_EXTENDED_XRUPT; 159 {ACPI_RSC_1BITFLAG, ACPI_RS_OFFSET(data.extended_irq.producer_consumer),
470 buffer += 1; 160 AML_OFFSET(extended_irq.flags),
161 0},
471 162
472 /* Save a pointer to the Length field - to be filled in later */ 163 {ACPI_RSC_1BITFLAG, ACPI_RS_OFFSET(data.extended_irq.triggering),
164 AML_OFFSET(extended_irq.flags),
165 1},
473 166
474 length_field = ACPI_CAST_PTR(u16, buffer); 167 {ACPI_RSC_1BITFLAG, ACPI_RS_OFFSET(data.extended_irq.polarity),
475 buffer += 2; 168 AML_OFFSET(extended_irq.flags),
169 2},
476 170
477 /* Set the Interrupt vector flags */ 171 {ACPI_RSC_1BITFLAG, ACPI_RS_OFFSET(data.extended_irq.sharable),
172 AML_OFFSET(extended_irq.flags),
173 3},
478 174
479 temp8 = (u8) (linked_list->data.extended_irq.producer_consumer & 0x01); 175 /* IRQ Table length (Byte4) */
480 temp8 |=
481 ((linked_list->data.extended_irq.shared_exclusive & 0x01) << 3);
482 176
483 /* 177 {ACPI_RSC_COUNT, ACPI_RS_OFFSET(data.extended_irq.interrupt_count),
484 * Set the Interrupt Mode 178 AML_OFFSET(extended_irq.interrupt_count),
485 * 179 sizeof(u32)}
486 * The definition of an Extended IRQ changed between ACPI spec v1.0b 180 ,
487 * and ACPI spec 2.0 (section 6.4.3.6 in both). This code does not
488 * implement the more restrictive definition of 1.0b
489 *
490 * - Edge/Level are defined opposite in the table vs the headers
491 */
492 if (ACPI_EDGE_SENSITIVE == linked_list->data.extended_irq.edge_level) {
493 temp8 |= 0x2;
494 }
495
496 /* Set the Interrupt Polarity */
497 181
498 temp8 |= ((linked_list->data.extended_irq.active_high_low & 0x1) << 2); 182 /* Copy every IRQ in the table, each is 32 bits */
499 183
500 *buffer = temp8; 184 {ACPI_RSC_MOVE32, ACPI_RS_OFFSET(data.extended_irq.interrupts[0]),
501 buffer += 1; 185 AML_OFFSET(extended_irq.interrupts[0]),
186 0}
187 ,
502 188
503 /* Set the Interrupt table length */ 189 /* Optional resource_source (Index and String) */
504 190
505 temp8 = (u8) linked_list->data.extended_irq.number_of_interrupts; 191 {ACPI_RSC_SOURCEX, ACPI_RS_OFFSET(data.extended_irq.resource_source),
192 ACPI_RS_OFFSET(data.extended_irq.interrupts[0]),
193 sizeof(struct aml_resource_extended_irq)}
194};
506 195
507 *buffer = temp8; 196/*******************************************************************************
508 buffer += 1; 197 *
509 198 * acpi_rs_convert_dma
510 for (index = 0; 199 *
511 index < linked_list->data.extended_irq.number_of_interrupts; 200 ******************************************************************************/
512 index++) {
513 ACPI_MOVE_32_TO_32(buffer,
514 &linked_list->data.extended_irq.
515 interrupts[index]);
516 buffer += 4;
517 }
518 201
519 /* Resource Source Index and Resource Source are optional */ 202struct acpi_rsconvert_info acpi_rs_convert_dma[6] = {
203 {ACPI_RSC_INITGET, ACPI_RESOURCE_TYPE_DMA,
204 ACPI_RS_SIZE(struct acpi_resource_dma),
205 ACPI_RSC_TABLE_SIZE(acpi_rs_convert_dma)},
520 206
521 if (0 != linked_list->data.extended_irq.resource_source.string_length) { 207 {ACPI_RSC_INITSET, ACPI_RESOURCE_NAME_DMA,
522 *buffer = 208 sizeof(struct aml_resource_dma),
523 (u8) linked_list->data.extended_irq.resource_source.index; 209 0},
524 buffer += 1;
525 210
526 /* Copy the string */ 211 /* Flags: transfer preference, bus mastering, channel speed */
527 212
528 ACPI_STRCPY((char *)buffer, 213 {ACPI_RSC_2BITFLAG, ACPI_RS_OFFSET(data.dma.transfer),
529 linked_list->data.extended_irq.resource_source. 214 AML_OFFSET(dma.flags),
530 string_ptr); 215 0},
531 216
532 /* 217 {ACPI_RSC_1BITFLAG, ACPI_RS_OFFSET(data.dma.bus_master),
533 * Buffer needs to be set to the length of the string + one for the 218 AML_OFFSET(dma.flags),
534 * terminating null 219 2},
535 */
536 buffer +=
537 (acpi_size) (ACPI_STRLEN
538 (linked_list->data.extended_irq.
539 resource_source.string_ptr) + 1);
540 }
541 220
542 /* Return the number of bytes consumed in this operation */ 221 {ACPI_RSC_2BITFLAG, ACPI_RS_OFFSET(data.dma.type),
222 AML_OFFSET(dma.flags),
223 5},
543 224
544 *bytes_consumed = ACPI_PTR_DIFF(buffer, *output_buffer); 225 /* DMA channel mask bits */
545 226
546 /* 227 {ACPI_RSC_BITMASK, ACPI_RS_OFFSET(data.dma.channels[0]),
547 * Set the length field to the number of bytes consumed 228 AML_OFFSET(dma.dma_channel_mask),
548 * minus the header size (3 bytes) 229 ACPI_RS_OFFSET(data.dma.channel_count)}
549 */ 230};
550 *length_field = (u16) (*bytes_consumed - 3);
551 return_ACPI_STATUS(AE_OK);
552}
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