1 /*******************************************************************************
3 * Module Name: rscalc - Calculate stream and list lengths
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2017, Intel Corp.
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20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
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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
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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
147 * some Large-type resource descriptors.
151 * If the length of the actual resource descriptor is greater than the
152 * ACPI spec-defined minimum length, it means that a resource_source_index
153 * exists and is followed by a (required) null terminated string. The
154 * string length (including the null terminator) is the resource length
155 * minus the minimum length, minus one byte for the resource_source_index
158 if (resource_length > minimum_aml_resource_length) {
160 /* Compute the length of the optional string */
163 resource_length - minimum_aml_resource_length - 1;
167 * Round the length up to a multiple of the native word in order to
168 * guarantee that the entire resource descriptor is native word aligned
170 return ((u32) ACPI_ROUND_UP_TO_NATIVE_WORD(string_length));
173 /*******************************************************************************
175 * FUNCTION: acpi_rs_get_aml_length
177 * PARAMETERS: resource - Pointer to the resource linked list
178 * resource_list_size - Size of the resource linked list
179 * size_needed - Where the required size is returned
183 * DESCRIPTION: Takes a linked list of internal resource descriptors and
184 * calculates the size buffer needed to hold the corresponding
185 * external resource byte stream.
187 ******************************************************************************/
190 acpi_rs_get_aml_length(struct acpi_resource *resource,
191 acpi_size resource_list_size, acpi_size *size_needed)
193 acpi_size aml_size_needed = 0;
194 struct acpi_resource *resource_end;
195 acpi_rs_length total_size;
197 ACPI_FUNCTION_TRACE(rs_get_aml_length);
199 /* Traverse entire list of internal resource descriptors */
202 ACPI_ADD_PTR(struct acpi_resource, resource, resource_list_size);
203 while (resource < resource_end) {
205 /* Validate the descriptor type */
207 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
208 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
211 /* Sanity check the length. It must not be zero, or we loop forever */
213 if (!resource->length) {
214 return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
217 /* Get the base size of the (external stream) resource descriptor */
219 total_size = acpi_gbl_aml_resource_sizes[resource->type];
222 * Augment the base size for descriptors with optional and/or
223 * variable-length fields
225 switch (resource->type) {
226 case ACPI_RESOURCE_TYPE_IRQ:
228 /* Length can be 3 or 2 */
230 if (resource->data.irq.descriptor_length == 2) {
235 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
237 /* Length can be 1 or 0 */
239 if (resource->data.irq.descriptor_length == 0) {
244 case ACPI_RESOURCE_TYPE_VENDOR:
246 * Vendor Defined Resource:
247 * For a Vendor Specific resource, if the Length is between 1 and 7
248 * it will be created as a Small Resource data type, otherwise it
249 * is a Large Resource data type.
251 if (resource->data.vendor.byte_length > 7) {
253 /* Base size of a Large resource descriptor */
256 sizeof(struct aml_resource_large_header);
259 /* Add the size of the vendor-specific data */
261 total_size = (acpi_rs_length)
262 (total_size + resource->data.vendor.byte_length);
265 case ACPI_RESOURCE_TYPE_END_TAG:
268 * We are done -- return the accumulated total size.
270 *size_needed = aml_size_needed + total_size;
274 return_ACPI_STATUS(AE_OK);
276 case ACPI_RESOURCE_TYPE_ADDRESS16:
278 * 16-Bit Address Resource:
279 * Add the size of the optional resource_source info
281 total_size = (acpi_rs_length)(total_size +
282 acpi_rs_struct_option_length
288 case ACPI_RESOURCE_TYPE_ADDRESS32:
290 * 32-Bit Address Resource:
291 * Add the size of the optional resource_source info
293 total_size = (acpi_rs_length)(total_size +
294 acpi_rs_struct_option_length
300 case ACPI_RESOURCE_TYPE_ADDRESS64:
302 * 64-Bit Address Resource:
303 * Add the size of the optional resource_source info
305 total_size = (acpi_rs_length)(total_size +
306 acpi_rs_struct_option_length
312 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
314 * Extended IRQ Resource:
315 * Add the size of each additional optional interrupt beyond the
316 * required 1 (4 bytes for each u32 interrupt number)
318 total_size = (acpi_rs_length)(total_size +
323 /* Add the size of the optional resource_source info */
324 acpi_rs_struct_option_length
330 case ACPI_RESOURCE_TYPE_GPIO:
332 total_size = (acpi_rs_length)(total_size +
333 (resource->data.gpio.
334 pin_table_length * 2) +
343 case ACPI_RESOURCE_TYPE_PIN_FUNCTION:
345 total_size = (acpi_rs_length)(total_size +
348 pin_table_length * 2) +
359 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
362 acpi_gbl_aml_resource_serial_bus_sizes[resource->
367 total_size = (acpi_rs_length)(total_size +
383 /* Update the total */
385 aml_size_needed += total_size;
387 /* Point to the next object */
390 ACPI_ADD_PTR(struct acpi_resource, resource,
394 /* Did not find an end_tag resource descriptor */
396 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
399 /*******************************************************************************
401 * FUNCTION: acpi_rs_get_list_length
403 * PARAMETERS: aml_buffer - Pointer to the resource byte stream
404 * aml_buffer_length - Size of aml_buffer
405 * size_needed - Where the size needed is returned
409 * DESCRIPTION: Takes an external resource byte stream and calculates the size
410 * buffer needed to hold the corresponding internal resource
411 * descriptor linked list.
413 ******************************************************************************/
416 acpi_rs_get_list_length(u8 *aml_buffer,
417 u32 aml_buffer_length, acpi_size *size_needed)
425 u32 extra_struct_bytes;
427 u8 minimum_aml_resource_length;
428 union aml_resource *aml_resource;
430 ACPI_FUNCTION_TRACE(rs_get_list_length);
432 *size_needed = ACPI_RS_SIZE_MIN; /* Minimum size is one end_tag */
433 end_aml = aml_buffer + aml_buffer_length;
435 /* Walk the list of AML resource descriptors */
437 while (aml_buffer < end_aml) {
439 /* Validate the Resource Type and Resource Length */
442 acpi_ut_validate_resource(NULL, aml_buffer,
444 if (ACPI_FAILURE(status)) {
446 * Exit on failure. Cannot continue because the descriptor length
449 return_ACPI_STATUS(status);
452 aml_resource = (void *)aml_buffer;
454 /* Get the resource length and base (minimum) AML size */
456 resource_length = acpi_ut_get_resource_length(aml_buffer);
457 minimum_aml_resource_length =
458 acpi_gbl_resource_aml_sizes[resource_index];
461 * Augment the size for descriptors with optional
462 * and/or variable length fields
464 extra_struct_bytes = 0;
466 aml_buffer + acpi_ut_get_resource_header_length(aml_buffer);
468 switch (acpi_ut_get_resource_type(aml_buffer)) {
469 case ACPI_RESOURCE_NAME_IRQ:
472 * Get the number of bits set in the 16-bit IRQ mask
474 ACPI_MOVE_16_TO_16(&temp16, buffer);
475 extra_struct_bytes = acpi_rs_count_set_bits(temp16);
478 case ACPI_RESOURCE_NAME_DMA:
481 * Get the number of bits set in the 8-bit DMA mask
483 extra_struct_bytes = acpi_rs_count_set_bits(*buffer);
486 case ACPI_RESOURCE_NAME_VENDOR_SMALL:
487 case ACPI_RESOURCE_NAME_VENDOR_LARGE:
490 * Get the number of vendor data bytes
492 extra_struct_bytes = resource_length;
495 * There is already one byte included in the minimum
496 * descriptor size. If there are extra struct bytes,
497 * subtract one from the count.
499 if (extra_struct_bytes) {
500 extra_struct_bytes--;
504 case ACPI_RESOURCE_NAME_END_TAG:
506 * End Tag: This is the normal exit
508 return_ACPI_STATUS(AE_OK);
510 case ACPI_RESOURCE_NAME_ADDRESS32:
511 case ACPI_RESOURCE_NAME_ADDRESS16:
512 case ACPI_RESOURCE_NAME_ADDRESS64:
515 * Add the size of the optional resource_source
518 acpi_rs_stream_option_length(resource_length,
519 minimum_aml_resource_length);
522 case ACPI_RESOURCE_NAME_EXTENDED_IRQ:
524 * Extended IRQ Resource:
525 * Using the interrupt_table_length, add 4 bytes for each additional
526 * interrupt. Note: at least one interrupt is required and is
527 * included in the minimum descriptor size (reason for the -1)
529 extra_struct_bytes = (buffer[1] - 1) * sizeof(u32);
531 /* Add the size of the optional resource_source */
533 extra_struct_bytes +=
534 acpi_rs_stream_option_length(resource_length -
536 minimum_aml_resource_length);
539 case ACPI_RESOURCE_NAME_GPIO:
541 /* Vendor data is optional */
543 if (aml_resource->gpio.vendor_length) {
544 extra_struct_bytes +=
545 aml_resource->gpio.vendor_offset -
546 aml_resource->gpio.pin_table_offset +
547 aml_resource->gpio.vendor_length;
549 extra_struct_bytes +=
550 aml_resource->large_header.resource_length +
551 sizeof(struct aml_resource_large_header) -
552 aml_resource->gpio.pin_table_offset;
556 case ACPI_RESOURCE_NAME_PIN_FUNCTION:
558 /* Vendor data is optional */
560 if (aml_resource->pin_function.vendor_length) {
561 extra_struct_bytes +=
562 aml_resource->pin_function.vendor_offset -
563 aml_resource->pin_function.
565 aml_resource->pin_function.vendor_length;
567 extra_struct_bytes +=
568 aml_resource->large_header.resource_length +
569 sizeof(struct aml_resource_large_header) -
570 aml_resource->pin_function.pin_table_offset;
574 case ACPI_RESOURCE_NAME_SERIAL_BUS:
576 minimum_aml_resource_length =
577 acpi_gbl_resource_aml_serial_bus_sizes
578 [aml_resource->common_serial_bus.type];
579 extra_struct_bytes +=
580 aml_resource->common_serial_bus.resource_length -
581 minimum_aml_resource_length;
590 * Update the required buffer size for the internal descriptor structs
592 * Important: Round the size up for the appropriate alignment. This
593 * is a requirement on IA64.
595 if (acpi_ut_get_resource_type(aml_buffer) ==
596 ACPI_RESOURCE_NAME_SERIAL_BUS) {
598 acpi_gbl_resource_struct_serial_bus_sizes
599 [aml_resource->common_serial_bus.type] +
603 acpi_gbl_resource_struct_sizes[resource_index] +
607 buffer_size = (u32)ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size);
608 *size_needed += buffer_size;
610 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
611 "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
612 acpi_ut_get_resource_type(aml_buffer),
613 acpi_ut_get_descriptor_length(aml_buffer),
617 * Point to the next resource within the AML stream using the length
618 * contained in the resource descriptor header
620 aml_buffer += acpi_ut_get_descriptor_length(aml_buffer);
623 /* Did not find an end_tag resource descriptor */
625 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
628 /*******************************************************************************
630 * FUNCTION: acpi_rs_get_pci_routing_table_length
632 * PARAMETERS: package_object - Pointer to the package object
633 * buffer_size_needed - u32 pointer of the size buffer
634 * needed to properly return the
639 * DESCRIPTION: Given a package representing a PCI routing table, this
640 * calculates the size of the corresponding linked list of
643 ******************************************************************************/
646 acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
647 acpi_size *buffer_size_needed)
649 u32 number_of_elements;
650 acpi_size temp_size_needed = 0;
651 union acpi_operand_object **top_object_list;
653 union acpi_operand_object *package_element;
654 union acpi_operand_object **sub_object_list;
658 ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length);
660 number_of_elements = package_object->package.count;
663 * Calculate the size of the return buffer.
664 * The base size is the number of elements * the sizes of the
665 * structures. Additional space for the strings is added below.
666 * The minus one is to subtract the size of the u8 Source[1]
667 * member because it is added below.
669 * But each PRT_ENTRY structure has a pointer to a string and
670 * the size of that string must be found.
672 top_object_list = package_object->package.elements;
674 for (index = 0; index < number_of_elements; index++) {
676 /* Dereference the subpackage */
678 package_element = *top_object_list;
680 /* We must have a valid Package object */
682 if (!package_element ||
683 (package_element->common.type != ACPI_TYPE_PACKAGE)) {
684 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
688 * The sub_object_list will now point to an array of the
689 * four IRQ elements: Address, Pin, Source and source_index
691 sub_object_list = package_element->package.elements;
693 /* Scan the irq_table_elements for the Source Name String */
697 for (table_index = 0;
698 table_index < package_element->package.count
699 && !name_found; table_index++) {
700 if (*sub_object_list && /* Null object allowed */
701 ((ACPI_TYPE_STRING ==
702 (*sub_object_list)->common.type) ||
703 ((ACPI_TYPE_LOCAL_REFERENCE ==
704 (*sub_object_list)->common.type) &&
705 ((*sub_object_list)->reference.class ==
706 ACPI_REFCLASS_NAME)))) {
709 /* Look at the next element */
715 temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4);
717 /* Was a String type found? */
720 if ((*sub_object_list)->common.type == ACPI_TYPE_STRING) {
722 * The length String.Length field does not include the
723 * terminating NULL, add 1
725 temp_size_needed += ((acpi_size)
726 (*sub_object_list)->string.
729 temp_size_needed += acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
733 * If no name was found, then this is a NULL, which is
734 * translated as a u32 zero.
736 temp_size_needed += sizeof(u32);
739 /* Round up the size since each element must be aligned */
741 temp_size_needed = ACPI_ROUND_UP_TO_64BIT(temp_size_needed);
743 /* Point to the next union acpi_operand_object */
749 * Add an extra element to the end of the list, essentially a
752 *buffer_size_needed =
753 temp_size_needed + sizeof(struct acpi_pci_routing_table);
754 return_ACPI_STATUS(AE_OK);