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[linux-2.6] / drivers / acpi / resources / rscalc.c
1 /*******************************************************************************
2  *
3  * Module Name: rscalc - Calculate stream and list lengths
4  *
5  ******************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2006, 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/acnamesp.h>
48
49 #define _COMPONENT          ACPI_RESOURCES
50 ACPI_MODULE_NAME("rscalc")
51
52 /* Local prototypes */
53 static u8 acpi_rs_count_set_bits(u16 bit_field);
54
55 static acpi_rs_length
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
61 /*******************************************************************************
62  *
63  * FUNCTION:    acpi_rs_count_set_bits
64  *
65  * PARAMETERS:  bit_field       - Field in which to count bits
66  *
67  * RETURN:      Number of bits set within the field
68  *
69  * DESCRIPTION: Count the number of bits set in a resource field. Used for
70  *              (Short descriptor) interrupt and DMA lists.
71  *
72  ******************************************************************************/
73
74 static u8 acpi_rs_count_set_bits(u16 bit_field)
75 {
76         u8 bits_set;
77
78         ACPI_FUNCTION_ENTRY();
79
80         for (bits_set = 0; bit_field; bits_set++) {
81
82                 /* Zero the least significant bit that is set */
83
84                 bit_field &= (bit_field - 1);
85         }
86
87         return (bits_set);
88 }
89
90 /*******************************************************************************
91  *
92  * FUNCTION:    acpi_rs_struct_option_length
93  *
94  * PARAMETERS:  resource_source     - Pointer to optional descriptor field
95  *
96  * RETURN:      Status
97  *
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
101  *
102  ******************************************************************************/
103
104 static acpi_rs_length
105 acpi_rs_struct_option_length(struct acpi_resource_source *resource_source)
106 {
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) {
115                 return ((acpi_rs_length) (resource_source->string_length + 1));
116         }
117
118         return (0);
119 }
120
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  ******************************************************************************/
136
137 static u32
138 acpi_rs_stream_option_length(u32 resource_length,
139                              u32 minimum_aml_resource_length)
140 {
141         u32 string_length = 0;
142
143         ACPI_FUNCTION_ENTRY();
144
145         /*
146          * The resource_source_index and resource_source are optional elements of some
147          * Large-type resource descriptors.
148          */
149
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          */
157         if (resource_length > minimum_aml_resource_length) {
158
159                 /* Compute the length of the optional string */
160
161                 string_length =
162                     resource_length - minimum_aml_resource_length - 1;
163         }
164
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));
170 }
171
172 /*******************************************************************************
173  *
174  * FUNCTION:    acpi_rs_get_aml_length
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  ******************************************************************************/
186
187 acpi_status
188 acpi_rs_get_aml_length(struct acpi_resource * resource, acpi_size * size_needed)
189 {
190         acpi_size aml_size_needed = 0;
191         acpi_rs_length total_size;
192
193         ACPI_FUNCTION_TRACE(rs_get_aml_length);
194
195         /* Traverse entire list of internal resource descriptors */
196
197         while (resource) {
198
199                 /* Validate the descriptor type */
200
201                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
202                         return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
203                 }
204
205                 /* Get the base size of the (external stream) resource descriptor */
206
207                 total_size = acpi_gbl_aml_resource_sizes[resource->type];
208
209                 /*
210                  * Augment the base size for descriptors with optional and/or
211                  * variable-length fields
212                  */
213                 switch (resource->type) {
214                 case ACPI_RESOURCE_TYPE_VENDOR:
215                         /*
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.
220                          */
221                         if (resource->data.vendor.byte_length > 7) {
222
223                                 /* Base size of a Large resource descriptor */
224
225                                 total_size =
226                                     sizeof(struct aml_resource_large_header);
227                         }
228
229                         /* Add the size of the vendor-specific data */
230
231                         total_size = (acpi_rs_length)
232                             (total_size + resource->data.vendor.byte_length);
233                         break;
234
235                 case ACPI_RESOURCE_TYPE_END_TAG:
236                         /*
237                          * End Tag:
238                          * We are done -- return the accumulated total size.
239                          */
240                         *size_needed = aml_size_needed + total_size;
241
242                         /* Normal exit */
243
244                         return_ACPI_STATUS(AE_OK);
245
246                 case ACPI_RESOURCE_TYPE_ADDRESS16:
247                         /*
248                          * 16-Bit Address Resource:
249                          * Add the size of the optional resource_source info
250                          */
251                         total_size = (acpi_rs_length)
252                             (total_size +
253                              acpi_rs_struct_option_length(&resource->data.
254                                                           address16.
255                                                           resource_source));
256                         break;
257
258                 case ACPI_RESOURCE_TYPE_ADDRESS32:
259                         /*
260                          * 32-Bit Address Resource:
261                          * Add the size of the optional resource_source info
262                          */
263                         total_size = (acpi_rs_length)
264                             (total_size +
265                              acpi_rs_struct_option_length(&resource->data.
266                                                           address32.
267                                                           resource_source));
268                         break;
269
270                 case ACPI_RESOURCE_TYPE_ADDRESS64:
271                         /*
272                          * 64-Bit Address Resource:
273                          * Add the size of the optional resource_source info
274                          */
275                         total_size = (acpi_rs_length)
276                             (total_size +
277                              acpi_rs_struct_option_length(&resource->data.
278                                                           address64.
279                                                           resource_source));
280                         break;
281
282                 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
283                         /*
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)
287                          */
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));
296                         break;
297
298                 default:
299                         break;
300                 }
301
302                 /* Update the total */
303
304                 aml_size_needed += total_size;
305
306                 /* Point to the next object */
307
308                 resource =
309                     ACPI_ADD_PTR(struct acpi_resource, resource,
310                                  resource->length);
311         }
312
313         /* Did not find an end_tag resource descriptor */
314
315         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
316 }
317
318 /*******************************************************************************
319  *
320  * FUNCTION:    acpi_rs_get_list_length
321  *
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
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
335 acpi_rs_get_list_length(u8 * aml_buffer,
336                         u32 aml_buffer_length, acpi_size * size_needed)
337 {
338         acpi_status status;
339         u8 *end_aml;
340         u8 *buffer;
341         u32 buffer_size;
342         u16 temp16;
343         u16 resource_length;
344         u32 extra_struct_bytes;
345         u8 resource_index;
346         u8 minimum_aml_resource_length;
347
348         ACPI_FUNCTION_TRACE(rs_get_list_length);
349
350         *size_needed = 0;
351         end_aml = aml_buffer + aml_buffer_length;
352
353         /* Walk the list of AML resource descriptors */
354
355         while (aml_buffer < end_aml) {
356
357                 /* Validate the Resource Type and Resource Length */
358
359                 status = acpi_ut_validate_resource(aml_buffer, &resource_index);
360                 if (ACPI_FAILURE(status)) {
361                         return_ACPI_STATUS(status);
362                 }
363
364                 /* Get the resource length and base (minimum) AML size */
365
366                 resource_length = acpi_ut_get_resource_length(aml_buffer);
367                 minimum_aml_resource_length =
368                     acpi_gbl_resource_aml_sizes[resource_index];
369
370                 /*
371                  * Augment the size for descriptors with optional
372                  * and/or variable length fields
373                  */
374                 extra_struct_bytes = 0;
375                 buffer =
376                     aml_buffer + acpi_ut_get_resource_header_length(aml_buffer);
377
378                 switch (acpi_ut_get_resource_type(aml_buffer)) {
379                 case ACPI_RESOURCE_NAME_IRQ:
380                         /*
381                          * IRQ Resource:
382                          * Get the number of bits set in the 16-bit IRQ mask
383                          */
384                         ACPI_MOVE_16_TO_16(&temp16, buffer);
385                         extra_struct_bytes = acpi_rs_count_set_bits(temp16);
386                         break;
387
388                 case ACPI_RESOURCE_NAME_DMA:
389                         /*
390                          * DMA Resource:
391                          * Get the number of bits set in the 8-bit DMA mask
392                          */
393                         extra_struct_bytes = acpi_rs_count_set_bits(*buffer);
394                         break;
395
396                 case ACPI_RESOURCE_NAME_VENDOR_SMALL:
397                 case ACPI_RESOURCE_NAME_VENDOR_LARGE:
398                         /*
399                          * Vendor Resource:
400                          * Get the number of vendor data bytes
401                          */
402                         extra_struct_bytes = resource_length;
403                         break;
404
405                 case ACPI_RESOURCE_NAME_END_TAG:
406                         /*
407                          * End Tag:
408                          * This is the normal exit, add size of end_tag
409                          */
410                         *size_needed += ACPI_RS_SIZE_MIN;
411                         return_ACPI_STATUS(AE_OK);
412
413                 case ACPI_RESOURCE_NAME_ADDRESS32:
414                 case ACPI_RESOURCE_NAME_ADDRESS16:
415                 case ACPI_RESOURCE_NAME_ADDRESS64:
416                         /*
417                          * Address Resource:
418                          * Add the size of the optional resource_source
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                         /*
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)
431                          */
432                         extra_struct_bytes = (buffer[1] - 1) * sizeof(u32);
433
434                         /* Add the size of the optional resource_source */
435
436                         extra_struct_bytes +=
437                             acpi_rs_stream_option_length(resource_length -
438                                                          extra_struct_bytes,
439                                                          minimum_aml_resource_length);
440                         break;
441
442                 default:
443                         break;
444                 }
445
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;
454                 buffer_size = (u32) ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size);
455
456                 *size_needed += buffer_size;
457
458                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
459                                   "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
460                                   acpi_ut_get_resource_type(aml_buffer),
461                                   acpi_ut_get_descriptor_length(aml_buffer),
462                                   buffer_size));
463
464                 /*
465                  * Point to the next resource within the AML stream using the length
466                  * contained in the resource descriptor header
467                  */
468                 aml_buffer += acpi_ut_get_descriptor_length(aml_buffer);
469         }
470
471         /* Did not find an end_tag resource descriptor */
472
473         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
474 }
475
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
494 acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
495                                      acpi_size * buffer_size_needed)
496 {
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;
505
506         ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length);
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++) {
523
524                 /* Dereference the sub-package */
525
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
534                 /* Scan the irq_table_elements for the Source Name String */
535
536                 name_found = FALSE;
537
538                 for (table_index = 0; table_index < 4 && !name_found;
539                      table_index++) {
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)))) {
547                                 name_found = TRUE;
548                         } else {
549                                 /* Look at the next element */
550
551                                 sub_object_list++;
552                         }
553                 }
554
555                 temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4);
556
557                 /* Was a String type found? */
558
559                 if (name_found) {
560                         if (ACPI_GET_OBJECT_TYPE(*sub_object_list) ==
561                             ACPI_TYPE_STRING) {
562                                 /*
563                                  * The length String.Length field does not include the
564                                  * terminating NULL, add 1
565                                  */
566                                 temp_size_needed += ((acpi_size)
567                                                      (*sub_object_list)->string.
568                                                      length + 1);
569                         } else {
570                                 temp_size_needed += acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
571                         }
572                 } else {
573                         /*
574                          * If no name was found, then this is a NULL, which is
575                          * translated as a u32 zero.
576                          */
577                         temp_size_needed += sizeof(u32);
578                 }
579
580                 /* Round up the size since each element must be aligned */
581
582                 temp_size_needed = ACPI_ROUND_UP_TO_64BIT(temp_size_needed);
583
584                 /* Point to the next union acpi_operand_object */
585
586                 top_object_list++;
587         }
588
589         /*
590          * Add an extra element to the end of the list, essentially a
591          * NULL terminator
592          */
593         *buffer_size_needed =
594             temp_size_needed + sizeof(struct acpi_pci_routing_table);
595         return_ACPI_STATUS(AE_OK);
596 }