1 /*******************************************************************************
3 * Module Name: rscalc - Calculate stream and list lengths
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2013, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
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
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41 * POSSIBILITY OF SUCH DAMAGES.
44 #include <acpi/acpi.h>
49 #define _COMPONENT ACPI_RESOURCES
50 ACPI_MODULE_NAME("rscalc")
52 /* Local prototypes */
53 static u8
acpi_rs_count_set_bits(u16 bit_field
);
56 acpi_rs_struct_option_length(struct acpi_resource_source
*resource_source
);
59 acpi_rs_stream_option_length(u32 resource_length
, u32 minimum_total_length
);
61 /*******************************************************************************
63 * FUNCTION: acpi_rs_count_set_bits
65 * PARAMETERS: bit_field - Field in which to count bits
67 * RETURN: Number of bits set within the field
69 * DESCRIPTION: Count the number of bits set in a resource field. Used for
70 * (Short descriptor) interrupt and DMA lists.
72 ******************************************************************************/
74 static u8
acpi_rs_count_set_bits(u16 bit_field
)
78 ACPI_FUNCTION_ENTRY();
80 for (bits_set
= 0; bit_field
; bits_set
++) {
82 /* Zero the least significant bit that is set */
84 bit_field
&= (u16
) (bit_field
- 1);
90 /*******************************************************************************
92 * FUNCTION: acpi_rs_struct_option_length
94 * PARAMETERS: resource_source - Pointer to optional descriptor field
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
102 ******************************************************************************/
104 static acpi_rs_length
105 acpi_rs_struct_option_length(struct acpi_resource_source
*resource_source
)
107 ACPI_FUNCTION_ENTRY();
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).
114 if (resource_source
->string_ptr
) {
115 return ((acpi_rs_length
) (resource_source
->string_length
+ 1));
121 /*******************************************************************************
123 * FUNCTION: acpi_rs_stream_option_length
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
129 * RETURN: Length of optional string (0 if no string present)
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
135 ******************************************************************************/
138 acpi_rs_stream_option_length(u32 resource_length
,
139 u32 minimum_aml_resource_length
)
141 u32 string_length
= 0;
143 ACPI_FUNCTION_ENTRY();
146 * The resource_source_index and resource_source are optional elements of some
147 * Large-type resource descriptors.
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.
157 if (resource_length
> minimum_aml_resource_length
) {
159 /* Compute the length of the optional string */
162 resource_length
- minimum_aml_resource_length
- 1;
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
169 return ((u32
) ACPI_ROUND_UP_TO_NATIVE_WORD(string_length
));
172 /*******************************************************************************
174 * FUNCTION: acpi_rs_get_aml_length
176 * PARAMETERS: resource - Pointer to the resource linked list
177 * size_needed - Where the required size is returned
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.
185 ******************************************************************************/
188 acpi_rs_get_aml_length(struct acpi_resource
* resource
, acpi_size
* size_needed
)
190 acpi_size aml_size_needed
= 0;
191 acpi_rs_length total_size
;
193 ACPI_FUNCTION_TRACE(rs_get_aml_length
);
195 /* Traverse entire list of internal resource descriptors */
199 /* Validate the descriptor type */
201 if (resource
->type
> ACPI_RESOURCE_TYPE_MAX
) {
202 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE
);
205 /* Get the base size of the (external stream) resource descriptor */
207 total_size
= acpi_gbl_aml_resource_sizes
[resource
->type
];
210 * Augment the base size for descriptors with optional and/or
211 * variable-length fields
213 switch (resource
->type
) {
214 case ACPI_RESOURCE_TYPE_IRQ
:
216 /* Length can be 3 or 2 */
218 if (resource
->data
.irq
.descriptor_length
== 2) {
223 case ACPI_RESOURCE_TYPE_START_DEPENDENT
:
225 /* Length can be 1 or 0 */
227 if (resource
->data
.irq
.descriptor_length
== 0) {
232 case ACPI_RESOURCE_TYPE_VENDOR
:
234 * Vendor Defined Resource:
235 * For a Vendor Specific resource, if the Length is between 1 and 7
236 * it will be created as a Small Resource data type, otherwise it
237 * is a Large Resource data type.
239 if (resource
->data
.vendor
.byte_length
> 7) {
241 /* Base size of a Large resource descriptor */
244 sizeof(struct aml_resource_large_header
);
247 /* Add the size of the vendor-specific data */
249 total_size
= (acpi_rs_length
)
250 (total_size
+ resource
->data
.vendor
.byte_length
);
253 case ACPI_RESOURCE_TYPE_END_TAG
:
256 * We are done -- return the accumulated total size.
258 *size_needed
= aml_size_needed
+ total_size
;
262 return_ACPI_STATUS(AE_OK
);
264 case ACPI_RESOURCE_TYPE_ADDRESS16
:
266 * 16-Bit Address Resource:
267 * Add the size of the optional resource_source info
269 total_size
= (acpi_rs_length
)
271 acpi_rs_struct_option_length(&resource
->data
.
276 case ACPI_RESOURCE_TYPE_ADDRESS32
:
278 * 32-Bit Address Resource:
279 * Add the size of the optional resource_source info
281 total_size
= (acpi_rs_length
)
283 acpi_rs_struct_option_length(&resource
->data
.
288 case ACPI_RESOURCE_TYPE_ADDRESS64
:
290 * 64-Bit Address Resource:
291 * Add the size of the optional resource_source info
293 total_size
= (acpi_rs_length
)
295 acpi_rs_struct_option_length(&resource
->data
.
300 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
302 * Extended IRQ Resource:
303 * Add the size of each additional optional interrupt beyond the
304 * required 1 (4 bytes for each u32 interrupt number)
306 total_size
= (acpi_rs_length
)
308 ((resource
->data
.extended_irq
.interrupt_count
-
310 /* Add the size of the optional resource_source info */
311 acpi_rs_struct_option_length(&resource
->data
.
316 case ACPI_RESOURCE_TYPE_GPIO
:
319 (acpi_rs_length
) (total_size
+
320 (resource
->data
.gpio
.
321 pin_table_length
* 2) +
323 resource_source
.string_length
+
329 case ACPI_RESOURCE_TYPE_SERIAL_BUS
:
332 acpi_gbl_aml_resource_serial_bus_sizes
[resource
->
337 total_size
= (acpi_rs_length
) (total_size
+
352 /* Update the total */
354 aml_size_needed
+= total_size
;
356 /* Point to the next object */
359 ACPI_ADD_PTR(struct acpi_resource
, resource
,
363 /* Did not find an end_tag resource descriptor */
365 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG
);
368 /*******************************************************************************
370 * FUNCTION: acpi_rs_get_list_length
372 * PARAMETERS: aml_buffer - Pointer to the resource byte stream
373 * aml_buffer_length - Size of aml_buffer
374 * size_needed - Where the size needed is returned
378 * DESCRIPTION: Takes an external resource byte stream and calculates the size
379 * buffer needed to hold the corresponding internal resource
380 * descriptor linked list.
382 ******************************************************************************/
385 acpi_rs_get_list_length(u8
* aml_buffer
,
386 u32 aml_buffer_length
, acpi_size
* size_needed
)
394 u32 extra_struct_bytes
;
396 u8 minimum_aml_resource_length
;
397 union aml_resource
*aml_resource
;
399 ACPI_FUNCTION_TRACE(rs_get_list_length
);
401 *size_needed
= ACPI_RS_SIZE_MIN
; /* Minimum size is one end_tag */
402 end_aml
= aml_buffer
+ aml_buffer_length
;
404 /* Walk the list of AML resource descriptors */
406 while (aml_buffer
< end_aml
) {
408 /* Validate the Resource Type and Resource Length */
411 acpi_ut_validate_resource(NULL
, aml_buffer
,
413 if (ACPI_FAILURE(status
)) {
415 * Exit on failure. Cannot continue because the descriptor length
418 return_ACPI_STATUS(status
);
421 aml_resource
= (void *)aml_buffer
;
423 /* Get the resource length and base (minimum) AML size */
425 resource_length
= acpi_ut_get_resource_length(aml_buffer
);
426 minimum_aml_resource_length
=
427 acpi_gbl_resource_aml_sizes
[resource_index
];
430 * Augment the size for descriptors with optional
431 * and/or variable length fields
433 extra_struct_bytes
= 0;
435 aml_buffer
+ acpi_ut_get_resource_header_length(aml_buffer
);
437 switch (acpi_ut_get_resource_type(aml_buffer
)) {
438 case ACPI_RESOURCE_NAME_IRQ
:
441 * Get the number of bits set in the 16-bit IRQ mask
443 ACPI_MOVE_16_TO_16(&temp16
, buffer
);
444 extra_struct_bytes
= acpi_rs_count_set_bits(temp16
);
447 case ACPI_RESOURCE_NAME_DMA
:
450 * Get the number of bits set in the 8-bit DMA mask
452 extra_struct_bytes
= acpi_rs_count_set_bits(*buffer
);
455 case ACPI_RESOURCE_NAME_VENDOR_SMALL
:
456 case ACPI_RESOURCE_NAME_VENDOR_LARGE
:
459 * Get the number of vendor data bytes
461 extra_struct_bytes
= resource_length
;
464 * There is already one byte included in the minimum
465 * descriptor size. If there are extra struct bytes,
466 * subtract one from the count.
468 if (extra_struct_bytes
) {
469 extra_struct_bytes
--;
473 case ACPI_RESOURCE_NAME_END_TAG
:
475 * End Tag: This is the normal exit
477 return_ACPI_STATUS(AE_OK
);
479 case ACPI_RESOURCE_NAME_ADDRESS32
:
480 case ACPI_RESOURCE_NAME_ADDRESS16
:
481 case ACPI_RESOURCE_NAME_ADDRESS64
:
484 * Add the size of the optional resource_source
487 acpi_rs_stream_option_length(resource_length
,
488 minimum_aml_resource_length
);
491 case ACPI_RESOURCE_NAME_EXTENDED_IRQ
:
493 * Extended IRQ Resource:
494 * Using the interrupt_table_length, add 4 bytes for each additional
495 * interrupt. Note: at least one interrupt is required and is
496 * included in the minimum descriptor size (reason for the -1)
498 extra_struct_bytes
= (buffer
[1] - 1) * sizeof(u32
);
500 /* Add the size of the optional resource_source */
502 extra_struct_bytes
+=
503 acpi_rs_stream_option_length(resource_length
-
505 minimum_aml_resource_length
);
508 case ACPI_RESOURCE_NAME_GPIO
:
510 /* Vendor data is optional */
512 if (aml_resource
->gpio
.vendor_length
) {
513 extra_struct_bytes
+=
514 aml_resource
->gpio
.vendor_offset
-
515 aml_resource
->gpio
.pin_table_offset
+
516 aml_resource
->gpio
.vendor_length
;
518 extra_struct_bytes
+=
519 aml_resource
->large_header
.resource_length
+
520 sizeof(struct aml_resource_large_header
) -
521 aml_resource
->gpio
.pin_table_offset
;
525 case ACPI_RESOURCE_NAME_SERIAL_BUS
:
527 minimum_aml_resource_length
=
528 acpi_gbl_resource_aml_serial_bus_sizes
529 [aml_resource
->common_serial_bus
.type
];
530 extra_struct_bytes
+=
531 aml_resource
->common_serial_bus
.resource_length
-
532 minimum_aml_resource_length
;
540 * Update the required buffer size for the internal descriptor structs
542 * Important: Round the size up for the appropriate alignment. This
543 * is a requirement on IA64.
545 if (acpi_ut_get_resource_type(aml_buffer
) ==
546 ACPI_RESOURCE_NAME_SERIAL_BUS
) {
548 acpi_gbl_resource_struct_serial_bus_sizes
549 [aml_resource
->common_serial_bus
.type
] +
553 acpi_gbl_resource_struct_sizes
[resource_index
] +
556 buffer_size
= (u32
)ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size
);
558 *size_needed
+= buffer_size
;
560 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES
,
561 "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
562 acpi_ut_get_resource_type(aml_buffer
),
563 acpi_ut_get_descriptor_length(aml_buffer
),
567 * Point to the next resource within the AML stream using the length
568 * contained in the resource descriptor header
570 aml_buffer
+= acpi_ut_get_descriptor_length(aml_buffer
);
573 /* Did not find an end_tag resource descriptor */
575 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG
);
578 /*******************************************************************************
580 * FUNCTION: acpi_rs_get_pci_routing_table_length
582 * PARAMETERS: package_object - Pointer to the package object
583 * buffer_size_needed - u32 pointer of the size buffer
584 * needed to properly return the
589 * DESCRIPTION: Given a package representing a PCI routing table, this
590 * calculates the size of the corresponding linked list of
593 ******************************************************************************/
596 acpi_rs_get_pci_routing_table_length(union acpi_operand_object
*package_object
,
597 acpi_size
* buffer_size_needed
)
599 u32 number_of_elements
;
600 acpi_size temp_size_needed
= 0;
601 union acpi_operand_object
**top_object_list
;
603 union acpi_operand_object
*package_element
;
604 union acpi_operand_object
**sub_object_list
;
608 ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length
);
610 number_of_elements
= package_object
->package
.count
;
613 * Calculate the size of the return buffer.
614 * The base size is the number of elements * the sizes of the
615 * structures. Additional space for the strings is added below.
616 * The minus one is to subtract the size of the u8 Source[1]
617 * member because it is added below.
619 * But each PRT_ENTRY structure has a pointer to a string and
620 * the size of that string must be found.
622 top_object_list
= package_object
->package
.elements
;
624 for (index
= 0; index
< number_of_elements
; index
++) {
626 /* Dereference the sub-package */
628 package_element
= *top_object_list
;
630 /* We must have a valid Package object */
632 if (!package_element
||
633 (package_element
->common
.type
!= ACPI_TYPE_PACKAGE
)) {
634 return_ACPI_STATUS(AE_AML_OPERAND_TYPE
);
638 * The sub_object_list will now point to an array of the
639 * four IRQ elements: Address, Pin, Source and source_index
641 sub_object_list
= package_element
->package
.elements
;
643 /* Scan the irq_table_elements for the Source Name String */
647 for (table_index
= 0; table_index
< 4 && !name_found
;
649 if (*sub_object_list
&& /* Null object allowed */
650 ((ACPI_TYPE_STRING
==
651 (*sub_object_list
)->common
.type
) ||
652 ((ACPI_TYPE_LOCAL_REFERENCE
==
653 (*sub_object_list
)->common
.type
) &&
654 ((*sub_object_list
)->reference
.class ==
655 ACPI_REFCLASS_NAME
)))) {
658 /* Look at the next element */
664 temp_size_needed
+= (sizeof(struct acpi_pci_routing_table
) - 4);
666 /* Was a String type found? */
669 if ((*sub_object_list
)->common
.type
== ACPI_TYPE_STRING
) {
671 * The length String.Length field does not include the
672 * terminating NULL, add 1
674 temp_size_needed
+= ((acpi_size
)
675 (*sub_object_list
)->string
.
678 temp_size_needed
+= acpi_ns_get_pathname_length((*sub_object_list
)->reference
.node
);
682 * If no name was found, then this is a NULL, which is
683 * translated as a u32 zero.
685 temp_size_needed
+= sizeof(u32
);
688 /* Round up the size since each element must be aligned */
690 temp_size_needed
= ACPI_ROUND_UP_TO_64BIT(temp_size_needed
);
692 /* Point to the next union acpi_operand_object */
698 * Add an extra element to the end of the list, essentially a
701 *buffer_size_needed
=
702 temp_size_needed
+ sizeof(struct acpi_pci_routing_table
);
703 return_ACPI_STATUS(AE_OK
);