| /******************************************************************************* |
| * |
| * Module Name: rscalc - Calculate stream and list lengths |
| * |
| ******************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2017, Intel Corp. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions, and the following disclaimer, |
| * without modification. |
| * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| * substantially similar to the "NO WARRANTY" disclaimer below |
| * ("Disclaimer") and any redistribution must be conditioned upon |
| * including a substantially similar Disclaimer requirement for further |
| * binary redistribution. |
| * 3. Neither the names of the above-listed copyright holders nor the names |
| * of any contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * NO WARRANTY |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGES. |
| */ |
| |
| #include <acpi/acpi.h> |
| #include "accommon.h" |
| #include "acresrc.h" |
| #include "acnamesp.h" |
| |
| #define _COMPONENT ACPI_RESOURCES |
| ACPI_MODULE_NAME("rscalc") |
| |
| /* Local prototypes */ |
| static u8 acpi_rs_count_set_bits(u16 bit_field); |
| |
| static acpi_rs_length |
| acpi_rs_struct_option_length(struct acpi_resource_source *resource_source); |
| |
| static u32 |
| acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length); |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_rs_count_set_bits |
| * |
| * PARAMETERS: bit_field - Field in which to count bits |
| * |
| * RETURN: Number of bits set within the field |
| * |
| * DESCRIPTION: Count the number of bits set in a resource field. Used for |
| * (Short descriptor) interrupt and DMA lists. |
| * |
| ******************************************************************************/ |
| |
| static u8 acpi_rs_count_set_bits(u16 bit_field) |
| { |
| u8 bits_set; |
| |
| ACPI_FUNCTION_ENTRY(); |
| |
| for (bits_set = 0; bit_field; bits_set++) { |
| |
| /* Zero the least significant bit that is set */ |
| |
| bit_field &= (u16) (bit_field - 1); |
| } |
| |
| return (bits_set); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_rs_struct_option_length |
| * |
| * PARAMETERS: resource_source - Pointer to optional descriptor field |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Common code to handle optional resource_source_index and |
| * resource_source fields in some Large descriptors. Used during |
| * list-to-stream conversion |
| * |
| ******************************************************************************/ |
| |
| static acpi_rs_length |
| acpi_rs_struct_option_length(struct acpi_resource_source *resource_source) |
| { |
| ACPI_FUNCTION_ENTRY(); |
| |
| /* |
| * If the resource_source string is valid, return the size of the string |
| * (string_length includes the NULL terminator) plus the size of the |
| * resource_source_index (1). |
| */ |
| if (resource_source->string_ptr) { |
| return ((acpi_rs_length)(resource_source->string_length + 1)); |
| } |
| |
| return (0); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_rs_stream_option_length |
| * |
| * PARAMETERS: resource_length - Length from the resource header |
| * minimum_total_length - Minimum length of this resource, before |
| * any optional fields. Includes header size |
| * |
| * RETURN: Length of optional string (0 if no string present) |
| * |
| * DESCRIPTION: Common code to handle optional resource_source_index and |
| * resource_source fields in some Large descriptors. Used during |
| * stream-to-list conversion |
| * |
| ******************************************************************************/ |
| |
| static u32 |
| acpi_rs_stream_option_length(u32 resource_length, |
| u32 minimum_aml_resource_length) |
| { |
| u32 string_length = 0; |
| |
| ACPI_FUNCTION_ENTRY(); |
| |
| /* |
| * The resource_source_index and resource_source are optional elements of |
| * some Large-type resource descriptors. |
| */ |
| |
| /* |
| * If the length of the actual resource descriptor is greater than the |
| * ACPI spec-defined minimum length, it means that a resource_source_index |
| * exists and is followed by a (required) null terminated string. The |
| * string length (including the null terminator) is the resource length |
| * minus the minimum length, minus one byte for the resource_source_index |
| * itself. |
| */ |
| if (resource_length > minimum_aml_resource_length) { |
| |
| /* Compute the length of the optional string */ |
| |
| string_length = |
| resource_length - minimum_aml_resource_length - 1; |
| } |
| |
| /* |
| * Round the length up to a multiple of the native word in order to |
| * guarantee that the entire resource descriptor is native word aligned |
| */ |
| return ((u32) ACPI_ROUND_UP_TO_NATIVE_WORD(string_length)); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_rs_get_aml_length |
| * |
| * PARAMETERS: resource - Pointer to the resource linked list |
| * resource_list_size - Size of the resource linked list |
| * size_needed - Where the required size is returned |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Takes a linked list of internal resource descriptors and |
| * calculates the size buffer needed to hold the corresponding |
| * external resource byte stream. |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_rs_get_aml_length(struct acpi_resource *resource, |
| acpi_size resource_list_size, acpi_size *size_needed) |
| { |
| acpi_size aml_size_needed = 0; |
| struct acpi_resource *resource_end; |
| acpi_rs_length total_size; |
| |
| ACPI_FUNCTION_TRACE(rs_get_aml_length); |
| |
| /* Traverse entire list of internal resource descriptors */ |
| |
| resource_end = |
| ACPI_ADD_PTR(struct acpi_resource, resource, resource_list_size); |
| while (resource < resource_end) { |
| |
| /* Validate the descriptor type */ |
| |
| if (resource->type > ACPI_RESOURCE_TYPE_MAX) { |
| return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); |
| } |
| |
| /* Sanity check the length. It must not be zero, or we loop forever */ |
| |
| if (!resource->length) { |
| return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH); |
| } |
| |
| /* Get the base size of the (external stream) resource descriptor */ |
| |
| total_size = acpi_gbl_aml_resource_sizes[resource->type]; |
| |
| /* |
| * Augment the base size for descriptors with optional and/or |
| * variable-length fields |
| */ |
| switch (resource->type) { |
| case ACPI_RESOURCE_TYPE_IRQ: |
| |
| /* Length can be 3 or 2 */ |
| |
| if (resource->data.irq.descriptor_length == 2) { |
| total_size--; |
| } |
| break; |
| |
| case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
| |
| /* Length can be 1 or 0 */ |
| |
| if (resource->data.irq.descriptor_length == 0) { |
| total_size--; |
| } |
| break; |
| |
| case ACPI_RESOURCE_TYPE_VENDOR: |
| /* |
| * Vendor Defined Resource: |
| * For a Vendor Specific resource, if the Length is between 1 and 7 |
| * it will be created as a Small Resource data type, otherwise it |
| * is a Large Resource data type. |
| */ |
| if (resource->data.vendor.byte_length > 7) { |
| |
| /* Base size of a Large resource descriptor */ |
| |
| total_size = |
| sizeof(struct aml_resource_large_header); |
| } |
| |
| /* Add the size of the vendor-specific data */ |
| |
| total_size = (acpi_rs_length) |
| (total_size + resource->data.vendor.byte_length); |
| break; |
| |
| case ACPI_RESOURCE_TYPE_END_TAG: |
| /* |
| * End Tag: |
| * We are done -- return the accumulated total size. |
| */ |
| *size_needed = aml_size_needed + total_size; |
| |
| /* Normal exit */ |
| |
| return_ACPI_STATUS(AE_OK); |
| |
| case ACPI_RESOURCE_TYPE_ADDRESS16: |
| /* |
| * 16-Bit Address Resource: |
| * Add the size of the optional resource_source info |
| */ |
| total_size = (acpi_rs_length)(total_size + |
| acpi_rs_struct_option_length |
| (&resource->data. |
| address16. |
| resource_source)); |
| break; |
| |
| case ACPI_RESOURCE_TYPE_ADDRESS32: |
| /* |
| * 32-Bit Address Resource: |
| * Add the size of the optional resource_source info |
| */ |
| total_size = (acpi_rs_length)(total_size + |
| acpi_rs_struct_option_length |
| (&resource->data. |
| address32. |
| resource_source)); |
| break; |
| |
| case ACPI_RESOURCE_TYPE_ADDRESS64: |
| /* |
| * 64-Bit Address Resource: |
| * Add the size of the optional resource_source info |
| */ |
| total_size = (acpi_rs_length)(total_size + |
| acpi_rs_struct_option_length |
| (&resource->data. |
| address64. |
| resource_source)); |
| break; |
| |
| case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
| /* |
| * Extended IRQ Resource: |
| * Add the size of each additional optional interrupt beyond the |
| * required 1 (4 bytes for each u32 interrupt number) |
| */ |
| total_size = (acpi_rs_length)(total_size + |
| ((resource->data. |
| extended_irq. |
| interrupt_count - |
| 1) * 4) + |
| /* Add the size of the optional resource_source info */ |
| acpi_rs_struct_option_length |
| (&resource->data. |
| extended_irq. |
| resource_source)); |
| break; |
| |
| case ACPI_RESOURCE_TYPE_GPIO: |
| |
| total_size = (acpi_rs_length)(total_size + |
| (resource->data.gpio. |
| pin_table_length * 2) + |
| resource->data.gpio. |
| resource_source. |
| string_length + |
| resource->data.gpio. |
| vendor_length); |
| |
| break; |
| |
| case ACPI_RESOURCE_TYPE_PIN_FUNCTION: |
| |
| total_size = (acpi_rs_length)(total_size + |
| (resource->data. |
| pin_function. |
| pin_table_length * 2) + |
| resource->data. |
| pin_function. |
| resource_source. |
| string_length + |
| resource->data. |
| pin_function. |
| vendor_length); |
| |
| break; |
| |
| case ACPI_RESOURCE_TYPE_SERIAL_BUS: |
| |
| total_size = |
| acpi_gbl_aml_resource_serial_bus_sizes[resource-> |
| data. |
| common_serial_bus. |
| type]; |
| |
| total_size = (acpi_rs_length)(total_size + |
| resource->data. |
| i2c_serial_bus. |
| resource_source. |
| string_length + |
| resource->data. |
| i2c_serial_bus. |
| vendor_length); |
| |
| break; |
| |
| case ACPI_RESOURCE_TYPE_PIN_CONFIG: |
| |
| total_size = (acpi_rs_length)(total_size + |
| (resource->data. |
| pin_config. |
| pin_table_length * 2) + |
| resource->data.pin_config. |
| resource_source. |
| string_length + |
| resource->data.pin_config. |
| vendor_length); |
| |
| break; |
| |
| case ACPI_RESOURCE_TYPE_PIN_GROUP: |
| |
| total_size = (acpi_rs_length)(total_size + |
| (resource->data.pin_group. |
| pin_table_length * 2) + |
| resource->data.pin_group. |
| resource_label. |
| string_length + |
| resource->data.pin_group. |
| vendor_length); |
| |
| break; |
| |
| case ACPI_RESOURCE_TYPE_PIN_GROUP_FUNCTION: |
| |
| total_size = (acpi_rs_length)(total_size + |
| resource->data. |
| pin_group_function. |
| resource_source. |
| string_length + |
| resource->data. |
| pin_group_function. |
| resource_source_label. |
| string_length + |
| resource->data. |
| pin_group_function. |
| vendor_length); |
| |
| break; |
| |
| case ACPI_RESOURCE_TYPE_PIN_GROUP_CONFIG: |
| |
| total_size = (acpi_rs_length)(total_size + |
| resource->data. |
| pin_group_config. |
| resource_source. |
| string_length + |
| resource->data. |
| pin_group_config. |
| resource_source_label. |
| string_length + |
| resource->data. |
| pin_group_config. |
| vendor_length); |
| |
| break; |
| |
| default: |
| |
| break; |
| } |
| |
| /* Update the total */ |
| |
| aml_size_needed += total_size; |
| |
| /* Point to the next object */ |
| |
| resource = |
| ACPI_ADD_PTR(struct acpi_resource, resource, |
| resource->length); |
| } |
| |
| /* Did not find an end_tag resource descriptor */ |
| |
| return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_rs_get_list_length |
| * |
| * PARAMETERS: aml_buffer - Pointer to the resource byte stream |
| * aml_buffer_length - Size of aml_buffer |
| * size_needed - Where the size needed is returned |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Takes an external resource byte stream and calculates the size |
| * buffer needed to hold the corresponding internal resource |
| * descriptor linked list. |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_rs_get_list_length(u8 *aml_buffer, |
| u32 aml_buffer_length, acpi_size *size_needed) |
| { |
| acpi_status status; |
| u8 *end_aml; |
| u8 *buffer; |
| u32 buffer_size; |
| u16 temp16; |
| u16 resource_length; |
| u32 extra_struct_bytes; |
| u8 resource_index; |
| u8 minimum_aml_resource_length; |
| union aml_resource *aml_resource; |
| |
| ACPI_FUNCTION_TRACE(rs_get_list_length); |
| |
| *size_needed = ACPI_RS_SIZE_MIN; /* Minimum size is one end_tag */ |
| end_aml = aml_buffer + aml_buffer_length; |
| |
| /* Walk the list of AML resource descriptors */ |
| |
| while (aml_buffer < end_aml) { |
| |
| /* Validate the Resource Type and Resource Length */ |
| |
| status = |
| acpi_ut_validate_resource(NULL, aml_buffer, |
| &resource_index); |
| if (ACPI_FAILURE(status)) { |
| /* |
| * Exit on failure. Cannot continue because the descriptor length |
| * may be bogus also. |
| */ |
| return_ACPI_STATUS(status); |
| } |
| |
| aml_resource = (void *)aml_buffer; |
| |
| /* Get the resource length and base (minimum) AML size */ |
| |
| resource_length = acpi_ut_get_resource_length(aml_buffer); |
| minimum_aml_resource_length = |
| acpi_gbl_resource_aml_sizes[resource_index]; |
| |
| /* |
| * Augment the size for descriptors with optional |
| * and/or variable length fields |
| */ |
| extra_struct_bytes = 0; |
| buffer = |
| aml_buffer + acpi_ut_get_resource_header_length(aml_buffer); |
| |
| switch (acpi_ut_get_resource_type(aml_buffer)) { |
| case ACPI_RESOURCE_NAME_IRQ: |
| /* |
| * IRQ Resource: |
| * Get the number of bits set in the 16-bit IRQ mask |
| */ |
| ACPI_MOVE_16_TO_16(&temp16, buffer); |
| extra_struct_bytes = acpi_rs_count_set_bits(temp16); |
| break; |
| |
| case ACPI_RESOURCE_NAME_DMA: |
| /* |
| * DMA Resource: |
| * Get the number of bits set in the 8-bit DMA mask |
| */ |
| extra_struct_bytes = acpi_rs_count_set_bits(*buffer); |
| break; |
| |
| case ACPI_RESOURCE_NAME_VENDOR_SMALL: |
| case ACPI_RESOURCE_NAME_VENDOR_LARGE: |
| /* |
| * Vendor Resource: |
| * Get the number of vendor data bytes |
| */ |
| extra_struct_bytes = resource_length; |
| |
| /* |
| * There is already one byte included in the minimum |
| * descriptor size. If there are extra struct bytes, |
| * subtract one from the count. |
| */ |
| if (extra_struct_bytes) { |
| extra_struct_bytes--; |
| } |
| break; |
| |
| case ACPI_RESOURCE_NAME_END_TAG: |
| /* |
| * End Tag: This is the normal exit |
| */ |
| return_ACPI_STATUS(AE_OK); |
| |
| case ACPI_RESOURCE_NAME_ADDRESS32: |
| case ACPI_RESOURCE_NAME_ADDRESS16: |
| case ACPI_RESOURCE_NAME_ADDRESS64: |
| /* |
| * Address Resource: |
| * Add the size of the optional resource_source |
| */ |
| extra_struct_bytes = |
| acpi_rs_stream_option_length(resource_length, |
| minimum_aml_resource_length); |
| break; |
| |
| case ACPI_RESOURCE_NAME_EXTENDED_IRQ: |
| /* |
| * Extended IRQ Resource: |
| * Using the interrupt_table_length, add 4 bytes for each additional |
| * interrupt. Note: at least one interrupt is required and is |
| * included in the minimum descriptor size (reason for the -1) |
| */ |
| extra_struct_bytes = (buffer[1] - 1) * sizeof(u32); |
| |
| /* Add the size of the optional resource_source */ |
| |
| extra_struct_bytes += |
| acpi_rs_stream_option_length(resource_length - |
| extra_struct_bytes, |
| minimum_aml_resource_length); |
| break; |
| |
| case ACPI_RESOURCE_NAME_GPIO: |
| |
| /* Vendor data is optional */ |
| |
| if (aml_resource->gpio.vendor_length) { |
| extra_struct_bytes += |
| aml_resource->gpio.vendor_offset - |
| aml_resource->gpio.pin_table_offset + |
| aml_resource->gpio.vendor_length; |
| } else { |
| extra_struct_bytes += |
| aml_resource->large_header.resource_length + |
| sizeof(struct aml_resource_large_header) - |
| aml_resource->gpio.pin_table_offset; |
| } |
| break; |
| |
| case ACPI_RESOURCE_NAME_PIN_FUNCTION: |
| |
| /* Vendor data is optional */ |
| |
| if (aml_resource->pin_function.vendor_length) { |
| extra_struct_bytes += |
| aml_resource->pin_function.vendor_offset - |
| aml_resource->pin_function. |
| pin_table_offset + |
| aml_resource->pin_function.vendor_length; |
| } else { |
| extra_struct_bytes += |
| aml_resource->large_header.resource_length + |
| sizeof(struct aml_resource_large_header) - |
| aml_resource->pin_function.pin_table_offset; |
| } |
| break; |
| |
| case ACPI_RESOURCE_NAME_SERIAL_BUS: |
| |
| minimum_aml_resource_length = |
| acpi_gbl_resource_aml_serial_bus_sizes |
| [aml_resource->common_serial_bus.type]; |
| extra_struct_bytes += |
| aml_resource->common_serial_bus.resource_length - |
| minimum_aml_resource_length; |
| break; |
| |
| case ACPI_RESOURCE_NAME_PIN_CONFIG: |
| |
| /* Vendor data is optional */ |
| |
| if (aml_resource->pin_config.vendor_length) { |
| extra_struct_bytes += |
| aml_resource->pin_config.vendor_offset - |
| aml_resource->pin_config.pin_table_offset + |
| aml_resource->pin_config.vendor_length; |
| } else { |
| extra_struct_bytes += |
| aml_resource->large_header.resource_length + |
| sizeof(struct aml_resource_large_header) - |
| aml_resource->pin_config.pin_table_offset; |
| } |
| break; |
| |
| case ACPI_RESOURCE_NAME_PIN_GROUP: |
| |
| extra_struct_bytes += |
| aml_resource->pin_group.vendor_offset - |
| aml_resource->pin_group.pin_table_offset + |
| aml_resource->pin_group.vendor_length; |
| |
| break; |
| |
| case ACPI_RESOURCE_NAME_PIN_GROUP_FUNCTION: |
| |
| extra_struct_bytes += |
| aml_resource->pin_group_function.vendor_offset - |
| aml_resource->pin_group_function.res_source_offset + |
| aml_resource->pin_group_function.vendor_length; |
| |
| break; |
| |
| case ACPI_RESOURCE_NAME_PIN_GROUP_CONFIG: |
| |
| extra_struct_bytes += |
| aml_resource->pin_group_config.vendor_offset - |
| aml_resource->pin_group_config.res_source_offset + |
| aml_resource->pin_group_config.vendor_length; |
| |
| break; |
| |
| default: |
| |
| break; |
| } |
| |
| /* |
| * Update the required buffer size for the internal descriptor structs |
| * |
| * Important: Round the size up for the appropriate alignment. This |
| * is a requirement on IA64. |
| */ |
| if (acpi_ut_get_resource_type(aml_buffer) == |
| ACPI_RESOURCE_NAME_SERIAL_BUS) { |
| buffer_size = |
| acpi_gbl_resource_struct_serial_bus_sizes |
| [aml_resource->common_serial_bus.type] + |
| extra_struct_bytes; |
| } else { |
| buffer_size = |
| acpi_gbl_resource_struct_sizes[resource_index] + |
| extra_struct_bytes; |
| } |
| |
| buffer_size = (u32)ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size); |
| *size_needed += buffer_size; |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, |
| "Type %.2X, AmlLength %.2X InternalLength %.2X\n", |
| acpi_ut_get_resource_type(aml_buffer), |
| acpi_ut_get_descriptor_length(aml_buffer), |
| buffer_size)); |
| |
| /* |
| * Point to the next resource within the AML stream using the length |
| * contained in the resource descriptor header |
| */ |
| aml_buffer += acpi_ut_get_descriptor_length(aml_buffer); |
| } |
| |
| /* Did not find an end_tag resource descriptor */ |
| |
| return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_rs_get_pci_routing_table_length |
| * |
| * PARAMETERS: package_object - Pointer to the package object |
| * buffer_size_needed - u32 pointer of the size buffer |
| * needed to properly return the |
| * parsed data |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Given a package representing a PCI routing table, this |
| * calculates the size of the corresponding linked list of |
| * descriptions. |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object, |
| acpi_size *buffer_size_needed) |
| { |
| u32 number_of_elements; |
| acpi_size temp_size_needed = 0; |
| union acpi_operand_object **top_object_list; |
| u32 index; |
| union acpi_operand_object *package_element; |
| union acpi_operand_object **sub_object_list; |
| u8 name_found; |
| u32 table_index; |
| |
| ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length); |
| |
| number_of_elements = package_object->package.count; |
| |
| /* |
| * Calculate the size of the return buffer. |
| * The base size is the number of elements * the sizes of the |
| * structures. Additional space for the strings is added below. |
| * The minus one is to subtract the size of the u8 Source[1] |
| * member because it is added below. |
| * |
| * But each PRT_ENTRY structure has a pointer to a string and |
| * the size of that string must be found. |
| */ |
| top_object_list = package_object->package.elements; |
| |
| for (index = 0; index < number_of_elements; index++) { |
| |
| /* Dereference the subpackage */ |
| |
| package_element = *top_object_list; |
| |
| /* We must have a valid Package object */ |
| |
| if (!package_element || |
| (package_element->common.type != ACPI_TYPE_PACKAGE)) { |
| return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
| } |
| |
| /* |
| * The sub_object_list will now point to an array of the |
| * four IRQ elements: Address, Pin, Source and source_index |
| */ |
| sub_object_list = package_element->package.elements; |
| |
| /* Scan the irq_table_elements for the Source Name String */ |
| |
| name_found = FALSE; |
| |
| for (table_index = 0; |
| table_index < package_element->package.count |
| && !name_found; table_index++) { |
| if (*sub_object_list && /* Null object allowed */ |
| ((ACPI_TYPE_STRING == |
| (*sub_object_list)->common.type) || |
| ((ACPI_TYPE_LOCAL_REFERENCE == |
| (*sub_object_list)->common.type) && |
| ((*sub_object_list)->reference.class == |
| ACPI_REFCLASS_NAME)))) { |
| name_found = TRUE; |
| } else { |
| /* Look at the next element */ |
| |
| sub_object_list++; |
| } |
| } |
| |
| temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4); |
| |
| /* Was a String type found? */ |
| |
| if (name_found) { |
| if ((*sub_object_list)->common.type == ACPI_TYPE_STRING) { |
| /* |
| * The length String.Length field does not include the |
| * terminating NULL, add 1 |
| */ |
| temp_size_needed += ((acpi_size) |
| (*sub_object_list)->string. |
| length + 1); |
| } else { |
| temp_size_needed += acpi_ns_get_pathname_length((*sub_object_list)->reference.node); |
| } |
| } else { |
| /* |
| * If no name was found, then this is a NULL, which is |
| * translated as a u32 zero. |
| */ |
| temp_size_needed += sizeof(u32); |
| } |
| |
| /* Round up the size since each element must be aligned */ |
| |
| temp_size_needed = ACPI_ROUND_UP_TO_64BIT(temp_size_needed); |
| |
| /* Point to the next union acpi_operand_object */ |
| |
| top_object_list++; |
| } |
| |
| /* |
| * Add an extra element to the end of the list, essentially a |
| * NULL terminator |
| */ |
| *buffer_size_needed = |
| temp_size_needed + sizeof(struct acpi_pci_routing_table); |
| return_ACPI_STATUS(AE_OK); |
| } |
