788 lines
24 KiB
C
788 lines
24 KiB
C
/*******************************************************************************
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*
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* Module Name: rscalc - Calculate stream and list lengths
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acresrc.h>
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#include <acpi/amlcode.h>
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#include <acpi/amlresrc.h>
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#include <acpi/acnamesp.h>
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#define _COMPONENT ACPI_RESOURCES
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ACPI_MODULE_NAME("rscalc")
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/*
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* Base sizes for external resource descriptors, indexed by internal type.
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* Includes size of the descriptor header (1 byte for small descriptors,
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* 3 bytes for large descriptors)
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*/
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static u8 acpi_gbl_stream_sizes[] = {
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4, /* ACPI_RSTYPE_IRQ (Byte 3 is optional, but always created) */
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3, /* ACPI_RSTYPE_DMA */
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2, /* ACPI_RSTYPE_START_DPF (Byte 1 is optional, but always created) */
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1, /* ACPI_RSTYPE_END_DPF */
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8, /* ACPI_RSTYPE_IO */
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4, /* ACPI_RSTYPE_FIXED_IO */
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1, /* ACPI_RSTYPE_VENDOR */
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2, /* ACPI_RSTYPE_END_TAG */
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12, /* ACPI_RSTYPE_MEM24 */
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20, /* ACPI_RSTYPE_MEM32 */
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12, /* ACPI_RSTYPE_FIXED_MEM32 */
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16, /* ACPI_RSTYPE_ADDRESS16 */
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26, /* ACPI_RSTYPE_ADDRESS32 */
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46, /* ACPI_RSTYPE_ADDRESS64 */
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9, /* ACPI_RSTYPE_EXT_IRQ */
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15 /* ACPI_RSTYPE_GENERIC_REG */
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};
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/*
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* Base sizes of resource descriptors, both the actual AML stream length and
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* size of the internal struct representation.
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*/
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struct acpi_resource_sizes {
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u8 minimum_stream_size;
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u8 minimum_struct_size;
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};
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static struct acpi_resource_sizes acpi_gbl_sm_resource_sizes[] = {
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{0, 0}, /* 0x00, Reserved */
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{0, 0}, /* 0x01, Reserved */
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{0, 0}, /* 0x02, Reserved */
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{0, 0}, /* 0x03, Reserved */
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{3, ACPI_SIZEOF_RESOURCE(struct acpi_resource_irq)}, /* ACPI_RDESC_TYPE_IRQ_FORMAT */
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{3, ACPI_SIZEOF_RESOURCE(struct acpi_resource_dma)}, /* ACPI_RDESC_TYPE_DMA_FORMAT */
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{1, ACPI_SIZEOF_RESOURCE(struct acpi_resource_start_dpf)}, /* ACPI_RDESC_TYPE_START_DEPENDENT */
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{1, ACPI_RESOURCE_LENGTH}, /* ACPI_RDESC_TYPE_END_DEPENDENT */
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{8, ACPI_SIZEOF_RESOURCE(struct acpi_resource_io)}, /* ACPI_RDESC_TYPE_IO_PORT */
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{4, ACPI_SIZEOF_RESOURCE(struct acpi_resource_fixed_io)}, /* ACPI_RDESC_TYPE_FIXED_IO_PORT */
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{0, 0}, /* 0x0A, Reserved */
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{0, 0}, /* 0x0B, Reserved */
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{0, 0}, /* 0x0C, Reserved */
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{0, 0}, /* 0x0D, Reserved */
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{1, ACPI_SIZEOF_RESOURCE(struct acpi_resource_vendor)}, /* ACPI_RDESC_TYPE_SMALL_VENDOR */
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{2, ACPI_RESOURCE_LENGTH}, /* ACPI_RDESC_TYPE_END_TAG */
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};
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static struct acpi_resource_sizes acpi_gbl_lg_resource_sizes[] = {
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{0, 0}, /* 0x00, Reserved */
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{12, ACPI_SIZEOF_RESOURCE(struct acpi_resource_mem24)}, /* ACPI_RDESC_TYPE_MEMORY_24 */
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{15, ACPI_SIZEOF_RESOURCE(struct acpi_resource_generic_reg)}, /* ACPI_RDESC_TYPE_GENERIC_REGISTER */
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{0, 0}, /* 0x03, Reserved */
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{3, ACPI_SIZEOF_RESOURCE(struct acpi_resource_vendor)}, /* ACPI_RDESC_TYPE_LARGE_VENDOR */
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{20, ACPI_SIZEOF_RESOURCE(struct acpi_resource_mem32)}, /* ACPI_RDESC_TYPE_MEMORY_32 */
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{12, ACPI_SIZEOF_RESOURCE(struct acpi_resource_fixed_mem32)}, /* ACPI_RDESC_TYPE_FIXED_MEMORY_32 */
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{26, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address32)}, /* ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE */
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{16, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address16)}, /* ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE */
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{9, ACPI_SIZEOF_RESOURCE(struct acpi_resource_ext_irq)}, /* ACPI_RDESC_TYPE_EXTENDED_XRUPT */
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{46, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address64)}, /* ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE */
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{56, ACPI_SIZEOF_RESOURCE(struct acpi_resource_address64)}, /* ACPI_RDESC_TYPE_EXTENDED_ADDRESS_SPACE */
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};
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/* Local prototypes */
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static u8 acpi_rs_count_set_bits(u16 bit_field);
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static struct acpi_resource_sizes *acpi_rs_get_resource_sizes(u8 resource_type);
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static u16 acpi_rs_get_resource_length(u8 * resource);
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static acpi_size
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acpi_rs_struct_option_length(struct acpi_resource_source *resource_source);
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static u32
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acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length);
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_count_set_bits
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*
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* PARAMETERS: bit_field - Field in which to count bits
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*
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* RETURN: Number of bits set within the field
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*
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* DESCRIPTION: Count the number of bits set in a resource field. Used for
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* (Short descriptor) interrupt and DMA lists.
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*
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******************************************************************************/
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static u8 acpi_rs_count_set_bits(u16 bit_field)
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{
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u8 bits_set;
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ACPI_FUNCTION_ENTRY();
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for (bits_set = 0; bit_field; bits_set++) {
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/* Zero the least significant bit that is set */
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bit_field &= (bit_field - 1);
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}
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return (bits_set);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_get_resource_sizes
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*
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* PARAMETERS: resource_type - Byte 0 of a resource descriptor
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*
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* RETURN: Pointer to the resource conversion handler
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*
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* DESCRIPTION: Extract the Resource Type/Name from the first byte of
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* a resource descriptor.
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*
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******************************************************************************/
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static struct acpi_resource_sizes *acpi_rs_get_resource_sizes(u8 resource_type)
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{
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struct acpi_resource_sizes *size_info;
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ACPI_FUNCTION_ENTRY();
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/* Determine if this is a small or large resource */
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if (resource_type & ACPI_RDESC_TYPE_LARGE) {
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/* Large Resource Type -- bits 6:0 contain the name */
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if (resource_type > ACPI_RDESC_LARGE_MAX) {
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return (NULL);
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}
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size_info = &acpi_gbl_lg_resource_sizes[(resource_type &
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ACPI_RDESC_LARGE_MASK)];
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} else {
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/* Small Resource Type -- bits 6:3 contain the name */
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size_info = &acpi_gbl_sm_resource_sizes[((resource_type &
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ACPI_RDESC_SMALL_MASK)
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>> 3)];
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}
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/* Zero entry indicates an invalid resource type */
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if (!size_info->minimum_stream_size) {
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return (NULL);
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}
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return (size_info);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_get_resource_length
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*
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* PARAMETERS: Resource - Pointer to the resource descriptor
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*
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* RETURN: Byte length of the (AML byte stream) descriptor. By definition,
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* this does not include the size of the descriptor header and the
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* length field itself.
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*
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* DESCRIPTION: Extract the length of a resource descriptor.
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*
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******************************************************************************/
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static u16 acpi_rs_get_resource_length(u8 * resource)
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{
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u16 resource_length;
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ACPI_FUNCTION_ENTRY();
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/* Determine if this is a small or large resource */
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if (*resource & ACPI_RDESC_TYPE_LARGE) {
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/* Large Resource type -- length is in bytes 1-2 */
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ACPI_MOVE_16_TO_16(&resource_length, (resource + 1));
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} else {
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/* Small Resource Type -- bits 2:0 of byte 0 contain the length */
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resource_length =
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(u16) (*resource & ACPI_RDESC_SMALL_LENGTH_MASK);
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}
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return (resource_length);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_struct_option_length
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*
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* PARAMETERS: resource_source - Pointer to optional descriptor field
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*
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* RETURN: Status
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*
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* DESCRIPTION: Common code to handle optional resource_source_index and
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* resource_source fields in some Large descriptors. Used during
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* list-to-stream conversion
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*
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******************************************************************************/
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static acpi_size
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acpi_rs_struct_option_length(struct acpi_resource_source *resource_source)
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{
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ACPI_FUNCTION_ENTRY();
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/*
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* If the resource_source string is valid, return the size of the string
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* (string_length includes the NULL terminator) plus the size of the
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* resource_source_index (1).
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*/
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if (resource_source->string_ptr) {
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return ((acpi_size) resource_source->string_length + 1);
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}
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return (0);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_stream_option_length
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*
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* PARAMETERS: resource_length - Length from the resource header
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* minimum_total_length - Minimum length of this resource, before
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* any optional fields. Includes header size
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*
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* RETURN: Length of optional string (0 if no string present)
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*
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* DESCRIPTION: Common code to handle optional resource_source_index and
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* resource_source fields in some Large descriptors. Used during
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* stream-to-list conversion
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*
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******************************************************************************/
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static u32
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acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length)
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{
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u32 string_length = 0;
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u32 minimum_resource_length;
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ACPI_FUNCTION_ENTRY();
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/*
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* The resource_source_index and resource_source are optional elements of some
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* Large-type resource descriptors.
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*/
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/* Compute minimum size of the data part of the resource descriptor */
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minimum_resource_length =
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minimum_total_length - sizeof(struct asl_large_header);
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/*
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* If the length of the actual resource descriptor is greater than the ACPI
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* spec-defined minimum length, it means that a resource_source_index exists
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* and is followed by a (required) null terminated string. The string length
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* (including the null terminator) is the resource length minus the minimum
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* length, minus one byte for the resource_source_index itself.
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*/
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if (resource_length > minimum_resource_length) {
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/* Compute the length of the optional string */
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string_length = resource_length - minimum_resource_length - 1;
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}
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/* Round up length to 32 bits for internal structure alignment */
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return (ACPI_ROUND_UP_to_32_bITS(string_length));
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_rs_get_byte_stream_length
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*
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* PARAMETERS: Resource - Pointer to the resource linked list
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* size_needed - Where the required size is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Takes a linked list of internal resource descriptors and
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* calculates the size buffer needed to hold the corresponding
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* external resource byte stream.
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*
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******************************************************************************/
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acpi_status
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acpi_rs_get_byte_stream_length(struct acpi_resource * resource,
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acpi_size * size_needed)
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{
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acpi_size byte_stream_size_needed = 0;
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acpi_size segment_size;
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ACPI_FUNCTION_TRACE("rs_get_byte_stream_length");
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/* Traverse entire list of internal resource descriptors */
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while (resource) {
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/* Validate the descriptor type */
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if (resource->type > ACPI_RSTYPE_MAX) {
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return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
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}
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/* Get the base size of the (external stream) resource descriptor */
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segment_size = acpi_gbl_stream_sizes[resource->type];
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/*
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* Augment the base size for descriptors with optional and/or
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* variable-length fields
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*/
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switch (resource->type) {
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case ACPI_RSTYPE_VENDOR:
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/*
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* Vendor Defined Resource:
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* For a Vendor Specific resource, if the Length is between 1 and 7
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* it will be created as a Small Resource data type, otherwise it
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* is a Large Resource data type.
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*/
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if (resource->data.vendor_specific.length > 7) {
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/* Base size of a Large resource descriptor */
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segment_size = 3;
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}
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/* Add the size of the vendor-specific data */
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segment_size += resource->data.vendor_specific.length;
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break;
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case ACPI_RSTYPE_END_TAG:
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/*
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* End Tag:
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* We are done -- return the accumulated total size.
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*/
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*size_needed = byte_stream_size_needed + segment_size;
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|
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/* Normal exit */
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return_ACPI_STATUS(AE_OK);
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|
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case ACPI_RSTYPE_ADDRESS16:
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/*
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* 16-Bit Address Resource:
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* Add the size of the optional resource_source info
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*/
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segment_size +=
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acpi_rs_struct_option_length(&resource->data.
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address16.
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resource_source);
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break;
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|
|
|
case ACPI_RSTYPE_ADDRESS32:
|
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/*
|
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* 32-Bit Address Resource:
|
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* Add the size of the optional resource_source info
|
|
*/
|
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segment_size +=
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acpi_rs_struct_option_length(&resource->data.
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address32.
|
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resource_source);
|
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break;
|
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|
|
case ACPI_RSTYPE_ADDRESS64:
|
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/*
|
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* 64-Bit Address Resource:
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* Add the size of the optional resource_source info
|
|
*/
|
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segment_size +=
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acpi_rs_struct_option_length(&resource->data.
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|
address64.
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resource_source);
|
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break;
|
|
|
|
case ACPI_RSTYPE_EXT_IRQ:
|
|
/*
|
|
* Extended IRQ Resource:
|
|
* Add the size of each additional optional interrupt beyond the
|
|
* required 1 (4 bytes for each u32 interrupt number)
|
|
*/
|
|
segment_size += (((acpi_size)
|
|
resource->data.extended_irq.
|
|
number_of_interrupts - 1) * 4);
|
|
|
|
/* Add the size of the optional resource_source info */
|
|
|
|
segment_size +=
|
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acpi_rs_struct_option_length(&resource->data.
|
|
extended_irq.
|
|
resource_source);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Update the total */
|
|
|
|
byte_stream_size_needed += segment_size;
|
|
|
|
/* Point to the next object */
|
|
|
|
resource = ACPI_PTR_ADD(struct acpi_resource,
|
|
resource, resource->length);
|
|
}
|
|
|
|
/* Did not find an END_TAG descriptor */
|
|
|
|
return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_rs_get_list_length
|
|
*
|
|
* PARAMETERS: byte_stream_buffer - Pointer to the resource byte stream
|
|
* byte_stream_buffer_length - Size of byte_stream_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 * byte_stream_buffer,
|
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u32 byte_stream_buffer_length, acpi_size * size_needed)
|
|
{
|
|
u8 *buffer;
|
|
struct acpi_resource_sizes *resource_info;
|
|
u32 buffer_size = 0;
|
|
u32 bytes_parsed = 0;
|
|
u8 resource_type;
|
|
u16 temp16;
|
|
u16 resource_length;
|
|
u16 header_length;
|
|
u32 extra_struct_bytes;
|
|
|
|
ACPI_FUNCTION_TRACE("rs_get_list_length");
|
|
|
|
while (bytes_parsed < byte_stream_buffer_length) {
|
|
/* The next byte in the stream is the resource descriptor type */
|
|
|
|
resource_type = acpi_rs_get_resource_type(*byte_stream_buffer);
|
|
|
|
/* Get the base stream size and structure sizes for the descriptor */
|
|
|
|
resource_info = acpi_rs_get_resource_sizes(resource_type);
|
|
if (!resource_info) {
|
|
return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
|
|
}
|
|
|
|
/* Get the Length field from the input resource descriptor */
|
|
|
|
resource_length =
|
|
acpi_rs_get_resource_length(byte_stream_buffer);
|
|
|
|
/* Augment the size for descriptors with optional fields */
|
|
|
|
extra_struct_bytes = 0;
|
|
|
|
if (!(resource_type & ACPI_RDESC_TYPE_LARGE)) {
|
|
/*
|
|
* Small resource descriptors
|
|
*/
|
|
header_length = 1;
|
|
buffer = byte_stream_buffer + header_length;
|
|
|
|
switch (resource_type) {
|
|
case ACPI_RDESC_TYPE_IRQ_FORMAT:
|
|
/*
|
|
* IRQ Resource:
|
|
* Get the number of bits set in the IRQ word
|
|
*/
|
|
ACPI_MOVE_16_TO_16(&temp16, buffer);
|
|
|
|
extra_struct_bytes =
|
|
(acpi_rs_count_set_bits(temp16) *
|
|
sizeof(u32));
|
|
break;
|
|
|
|
case ACPI_RDESC_TYPE_DMA_FORMAT:
|
|
/*
|
|
* DMA Resource:
|
|
* Get the number of bits set in the DMA channels byte
|
|
*/
|
|
extra_struct_bytes =
|
|
(acpi_rs_count_set_bits((u16) * buffer) *
|
|
sizeof(u32));
|
|
break;
|
|
|
|
case ACPI_RDESC_TYPE_SMALL_VENDOR:
|
|
/*
|
|
* Vendor Specific Resource:
|
|
* Ensure a 32-bit boundary for the structure
|
|
*/
|
|
extra_struct_bytes =
|
|
ACPI_ROUND_UP_to_32_bITS(resource_length);
|
|
break;
|
|
|
|
case ACPI_RDESC_TYPE_END_TAG:
|
|
/*
|
|
* End Tag:
|
|
* Terminate the loop now
|
|
*/
|
|
byte_stream_buffer_length = bytes_parsed;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
} else {
|
|
/*
|
|
* Large resource descriptors
|
|
*/
|
|
header_length = sizeof(struct asl_large_header);
|
|
buffer = byte_stream_buffer + header_length;
|
|
|
|
switch (resource_type) {
|
|
case ACPI_RDESC_TYPE_LARGE_VENDOR:
|
|
/*
|
|
* Vendor Defined Resource:
|
|
* Add vendor data and ensure a 32-bit boundary for the structure
|
|
*/
|
|
extra_struct_bytes =
|
|
ACPI_ROUND_UP_to_32_bITS(resource_length);
|
|
break;
|
|
|
|
case ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE:
|
|
case ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE:
|
|
/*
|
|
* 32-Bit or 16-bit Address Resource:
|
|
* Add the size of any optional data (resource_source)
|
|
*/
|
|
extra_struct_bytes =
|
|
acpi_rs_stream_option_length
|
|
(resource_length,
|
|
resource_info->minimum_stream_size);
|
|
break;
|
|
|
|
case ACPI_RDESC_TYPE_EXTENDED_XRUPT:
|
|
/*
|
|
* Extended IRQ:
|
|
* Point past the interrupt_vector_flags to get the
|
|
* interrupt_table_length.
|
|
*/
|
|
buffer++;
|
|
|
|
/*
|
|
* Add 4 bytes for each additional interrupt. Note: at least one
|
|
* interrupt is required and is included in the minimum
|
|
* descriptor size
|
|
*/
|
|
extra_struct_bytes =
|
|
((*buffer - 1) * sizeof(u32));
|
|
|
|
/* Add the size of any optional data (resource_source) */
|
|
|
|
extra_struct_bytes +=
|
|
acpi_rs_stream_option_length(resource_length
|
|
-
|
|
extra_struct_bytes,
|
|
resource_info->
|
|
minimum_stream_size);
|
|
break;
|
|
|
|
case ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE:
|
|
/*
|
|
* 64-Bit Address Resource:
|
|
* Add the size of any optional data (resource_source)
|
|
* Ensure a 64-bit boundary for the structure
|
|
*/
|
|
extra_struct_bytes =
|
|
ACPI_ROUND_UP_to_64_bITS
|
|
(acpi_rs_stream_option_length
|
|
(resource_length,
|
|
resource_info->minimum_stream_size));
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Update the required buffer size for the internal descriptor structs */
|
|
|
|
temp16 =
|
|
(u16) (resource_info->minimum_struct_size +
|
|
extra_struct_bytes);
|
|
buffer_size += (u32) ACPI_ALIGN_RESOURCE_SIZE(temp16);
|
|
|
|
/*
|
|
* Update byte count and point to the next resource within the stream
|
|
* using the size of the header plus the length contained in the header
|
|
*/
|
|
temp16 = (u16) (header_length + resource_length);
|
|
bytes_parsed += temp16;
|
|
byte_stream_buffer += temp16;
|
|
}
|
|
|
|
/* This is the data the caller needs */
|
|
|
|
*size_needed = buffer_size;
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* 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 sub-package */
|
|
|
|
package_element = *top_object_list;
|
|
|
|
/*
|
|
* 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 < 4 && !name_found;
|
|
table_index++) {
|
|
if ((ACPI_TYPE_STRING ==
|
|
ACPI_GET_OBJECT_TYPE(*sub_object_list))
|
|
||
|
|
((ACPI_TYPE_LOCAL_REFERENCE ==
|
|
ACPI_GET_OBJECT_TYPE(*sub_object_list))
|
|
&& ((*sub_object_list)->reference.opcode ==
|
|
AML_INT_NAMEPATH_OP))) {
|
|
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 (ACPI_GET_OBJECT_TYPE(*sub_object_list) ==
|
|
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_64_bITS(temp_size_needed);
|
|
|
|
/* Point to the next union acpi_operand_object */
|
|
|
|
top_object_list++;
|
|
}
|
|
|
|
/*
|
|
* Adding 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);
|
|
}
|