rscalc.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:20k
- /*******************************************************************************
- *
- * Module Name: rscalc - Calculate stream and list lengths
- * $Revision: 32 $
- *
- ******************************************************************************/
- /*
- * Copyright (C) 2000, 2001 R. Byron Moore
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "acpi.h"
- #include "acresrc.h"
- #include "amlcode.h"
- #include "acnamesp.h"
- #define _COMPONENT ACPI_RESOURCES
- MODULE_NAME ("rscalc")
- /*******************************************************************************
- *
- * FUNCTION: Acpi_rs_calculate_byte_stream_length
- *
- * PARAMETERS: Linked_list - Pointer to the resource linked list
- * Size_needed - u32 pointer of the size buffer needed
- * to properly return the parsed data
- *
- * RETURN: Status
- *
- * DESCRIPTION: Takes the resource byte stream and parses it once, calculating
- * the size buffer needed to hold the linked list that conveys
- * the resource data.
- *
- ******************************************************************************/
- acpi_status
- acpi_rs_calculate_byte_stream_length (
- acpi_resource *linked_list,
- u32 *size_needed)
- {
- u32 byte_stream_size_needed = 0;
- u32 segment_size;
- acpi_resource_ext_irq *ex_irq = NULL;
- u8 done = FALSE;
- FUNCTION_TRACE ("Rs_calculate_byte_stream_length");
- while (!done) {
- /*
- * Init the variable that will hold the size to add to the total.
- */
- segment_size = 0;
- switch (linked_list->id) {
- case ACPI_RSTYPE_IRQ:
- /*
- * IRQ Resource
- * For an IRQ Resource, Byte 3, although optional, will
- * always be created - it holds IRQ information.
- */
- segment_size = 4;
- break;
- case ACPI_RSTYPE_DMA:
- /*
- * DMA Resource
- * For this resource the size is static
- */
- segment_size = 3;
- break;
- case ACPI_RSTYPE_START_DPF:
- /*
- * Start Dependent Functions Resource
- * For a Start_dependent_functions Resource, Byte 1,
- * although optional, will always be created.
- */
- segment_size = 2;
- break;
- case ACPI_RSTYPE_END_DPF:
- /*
- * End Dependent Functions Resource
- * For this resource the size is static
- */
- segment_size = 1;
- break;
- case ACPI_RSTYPE_IO:
- /*
- * IO Port Resource
- * For this resource the size is static
- */
- segment_size = 8;
- break;
- case ACPI_RSTYPE_FIXED_IO:
- /*
- * Fixed IO Port Resource
- * For this resource the size is static
- */
- segment_size = 4;
- break;
- case ACPI_RSTYPE_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 (linked_list->data.vendor_specific.length > 7) {
- segment_size = 3;
- }
- else {
- segment_size = 1;
- }
- segment_size += linked_list->data.vendor_specific.length;
- break;
- case ACPI_RSTYPE_END_TAG:
- /*
- * End Tag
- * For this resource the size is static
- */
- segment_size = 2;
- done = TRUE;
- break;
- case ACPI_RSTYPE_MEM24:
- /*
- * 24-Bit Memory Resource
- * For this resource the size is static
- */
- segment_size = 12;
- break;
- case ACPI_RSTYPE_MEM32:
- /*
- * 32-Bit Memory Range Resource
- * For this resource the size is static
- */
- segment_size = 20;
- break;
- case ACPI_RSTYPE_FIXED_MEM32:
- /*
- * 32-Bit Fixed Memory Resource
- * For this resource the size is static
- */
- segment_size = 12;
- break;
- case ACPI_RSTYPE_ADDRESS16:
- /*
- * 16-Bit Address Resource
- * The base size of this byte stream is 16. If a
- * Resource Source string is not NULL, add 1 for
- * the Index + the length of the null terminated
- * string Resource Source + 1 for the null.
- */
- segment_size = 16;
- if (NULL != linked_list->data.address16.resource_source.string_ptr) {
- segment_size += (1 +
- linked_list->data.address16.resource_source.string_length);
- }
- break;
- case ACPI_RSTYPE_ADDRESS32:
- /*
- * 32-Bit Address Resource
- * The base size of this byte stream is 26. If a Resource
- * Source string is not NULL, add 1 for the Index + the
- * length of the null terminated string Resource Source +
- * 1 for the null.
- */
- segment_size = 26;
- if (NULL != linked_list->data.address32.resource_source.string_ptr) {
- segment_size += (1 +
- linked_list->data.address32.resource_source.string_length);
- }
- break;
- case ACPI_RSTYPE_ADDRESS64:
- /*
- * 64-Bit Address Resource
- * The base size of this byte stream is 46. If a Resource
- * Source string is not NULL, add 1 for the Index + the
- * length of the null terminated string Resource Source +
- * 1 for the null.
- */
- segment_size = 46;
- if (NULL != linked_list->data.address64.resource_source.string_ptr) {
- segment_size += (1 +
- linked_list->data.address64.resource_source.string_length);
- }
- break;
- case ACPI_RSTYPE_EXT_IRQ:
- /*
- * Extended IRQ Resource
- * The base size of this byte stream is 9. This is for an
- * Interrupt table length of 1. For each additional
- * interrupt, add 4.
- * If a Resource Source string is not NULL, add 1 for the
- * Index + the length of the null terminated string
- * Resource Source + 1 for the null.
- */
- segment_size = 9 +
- ((linked_list->data.extended_irq.number_of_interrupts - 1) * 4);
- if (NULL != ex_irq->resource_source.string_ptr) {
- segment_size += (1 +
- linked_list->data.extended_irq.resource_source.string_length);
- }
- break;
- default:
- /*
- * If we get here, everything is out of sync,
- * so exit with an error
- */
- return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
- break;
- } /* switch (Linked_list->Id) */
- /*
- * Update the total
- */
- byte_stream_size_needed += segment_size;
- /*
- * Point to the next object
- */
- linked_list = POINTER_ADD (acpi_resource,
- linked_list, linked_list->length);
- }
- /*
- * This is the data the caller needs
- */
- *size_needed = byte_stream_size_needed;
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_rs_calculate_list_length
- *
- * PARAMETERS: Byte_stream_buffer - Pointer to the resource byte stream
- * Byte_stream_buffer_length - Size of Byte_stream_buffer
- * Size_needed - u32 pointer of the size buffer
- * needed to properly return the
- * parsed data
- *
- * RETURN: Status
- *
- * DESCRIPTION: Takes the resource byte stream and parses it once, calculating
- * the size buffer needed to hold the linked list that conveys
- * the resource data.
- *
- ******************************************************************************/
- acpi_status
- acpi_rs_calculate_list_length (
- u8 *byte_stream_buffer,
- u32 byte_stream_buffer_length,
- u32 *size_needed)
- {
- u32 buffer_size = 0;
- u32 bytes_parsed = 0;
- u8 number_of_interrupts = 0;
- u8 number_of_channels = 0;
- u8 resource_type;
- u32 structure_size;
- u32 bytes_consumed;
- u8 *buffer;
- u8 temp8;
- u16 temp16;
- u8 index;
- u8 additional_bytes;
- FUNCTION_TRACE ("Rs_calculate_list_length");
- while (bytes_parsed < byte_stream_buffer_length) {
- /*
- * The next byte in the stream is the resource type
- */
- resource_type = acpi_rs_get_resource_type (*byte_stream_buffer);
- switch (resource_type) {
- case RESOURCE_DESC_MEMORY_24:
- /*
- * 24-Bit Memory Resource
- */
- bytes_consumed = 12;
- structure_size = SIZEOF_RESOURCE (acpi_resource_mem24);
- break;
- case RESOURCE_DESC_LARGE_VENDOR:
- /*
- * Vendor Defined Resource
- */
- buffer = byte_stream_buffer;
- ++buffer;
- MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
- bytes_consumed = temp16 + 3;
- /*
- * Ensure a 32-bit boundary for the structure
- */
- temp16 = (u16) ROUND_UP_TO_32_bITS (temp16);
- structure_size = SIZEOF_RESOURCE (acpi_resource_vendor) +
- (temp16 * sizeof (u8));
- break;
- case RESOURCE_DESC_MEMORY_32:
- /*
- * 32-Bit Memory Range Resource
- */
- bytes_consumed = 20;
- structure_size = SIZEOF_RESOURCE (acpi_resource_mem32);
- break;
- case RESOURCE_DESC_FIXED_MEMORY_32:
- /*
- * 32-Bit Fixed Memory Resource
- */
- bytes_consumed = 12;
- structure_size = SIZEOF_RESOURCE (acpi_resource_fixed_mem32);
- break;
- case RESOURCE_DESC_QWORD_ADDRESS_SPACE:
- /*
- * 64-Bit Address Resource
- */
- buffer = byte_stream_buffer;
- ++buffer;
- MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
- bytes_consumed = temp16 + 3;
- /*
- * Resource Source Index and Resource Source are
- * optional elements. Check the length of the
- * Bytestream. If it is greater than 43, that
- * means that an Index exists and is followed by
- * a null termininated string. Therefore, set
- * the temp variable to the length minus the minimum
- * byte stream length plus the byte for the Index to
- * determine the size of the NULL terminiated string.
- */
- if (43 < temp16) {
- temp8 = (u8) (temp16 - 44);
- }
- else {
- temp8 = 0;
- }
- /*
- * Ensure a 64-bit boundary for the structure
- */
- temp8 = (u8) ROUND_UP_TO_64_bITS (temp8);
- structure_size = SIZEOF_RESOURCE (acpi_resource_address64) +
- (temp8 * sizeof (u8));
- break;
- case RESOURCE_DESC_DWORD_ADDRESS_SPACE:
- /*
- * 32-Bit Address Resource
- */
- buffer = byte_stream_buffer;
- ++buffer;
- MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
- bytes_consumed = temp16 + 3;
- /*
- * Resource Source Index and Resource Source are
- * optional elements. Check the length of the
- * Bytestream. If it is greater than 23, that
- * means that an Index exists and is followed by
- * a null termininated string. Therefore, set
- * the temp variable to the length minus the minimum
- * byte stream length plus the byte for the Index to
- * determine the size of the NULL terminiated string.
- */
- if (23 < temp16) {
- temp8 = (u8) (temp16 - 24);
- }
- else {
- temp8 = 0;
- }
- /*
- * Ensure a 32-bit boundary for the structure
- */
- temp8 = (u8) ROUND_UP_TO_32_bITS (temp8);
- structure_size = SIZEOF_RESOURCE (acpi_resource_address32) +
- (temp8 * sizeof (u8));
- break;
- case RESOURCE_DESC_WORD_ADDRESS_SPACE:
- /*
- * 16-Bit Address Resource
- */
- buffer = byte_stream_buffer;
- ++buffer;
- MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
- bytes_consumed = temp16 + 3;
- /*
- * Resource Source Index and Resource Source are
- * optional elements. Check the length of the
- * Bytestream. If it is greater than 13, that
- * means that an Index exists and is followed by
- * a null termininated string. Therefore, set
- * the temp variable to the length minus the minimum
- * byte stream length plus the byte for the Index to
- * determine the size of the NULL terminiated string.
- */
- if (13 < temp16) {
- temp8 = (u8) (temp16 - 14);
- }
- else {
- temp8 = 0;
- }
- /*
- * Ensure a 32-bit boundary for the structure
- */
- temp8 = (u8) ROUND_UP_TO_32_bITS (temp8);
- structure_size = SIZEOF_RESOURCE (acpi_resource_address16) +
- (temp8 * sizeof (u8));
- break;
- case RESOURCE_DESC_EXTENDED_XRUPT:
- /*
- * Extended IRQ
- */
- buffer = byte_stream_buffer;
- ++buffer;
- MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
- bytes_consumed = temp16 + 3;
- /*
- * Point past the length field and the
- * Interrupt vector flags to save off the
- * Interrupt table length to the Temp8 variable.
- */
- buffer += 3;
- temp8 = *buffer;
- /*
- * To compensate for multiple interrupt numbers, add 4 bytes for
- * each additional interrupts greater than 1
- */
- additional_bytes = (u8) ((temp8 - 1) * 4);
- /*
- * Resource Source Index and Resource Source are
- * optional elements. Check the length of the
- * Bytestream. If it is greater than 9, that
- * means that an Index exists and is followed by
- * a null termininated string. Therefore, set
- * the temp variable to the length minus the minimum
- * byte stream length plus the byte for the Index to
- * determine the size of the NULL terminiated string.
- */
- if (9 + additional_bytes < temp16) {
- temp8 = (u8) (temp16 - (9 + additional_bytes));
- }
- else {
- temp8 = 0;
- }
- /*
- * Ensure a 32-bit boundary for the structure
- */
- temp8 = (u8) ROUND_UP_TO_32_bITS (temp8);
- structure_size = SIZEOF_RESOURCE (acpi_resource_ext_irq) +
- (additional_bytes * sizeof (u8)) +
- (temp8 * sizeof (u8));
- break;
- case RESOURCE_DESC_IRQ_FORMAT:
- /*
- * IRQ Resource.
- * Determine if it there are two or three trailing bytes
- */
- buffer = byte_stream_buffer;
- temp8 = *buffer;
- if(temp8 & 0x01) {
- bytes_consumed = 4;
- }
- else {
- bytes_consumed = 3;
- }
- /*
- * Point past the descriptor
- */
- ++buffer;
- /*
- * Look at the number of bits set
- */
- MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
- for (index = 0; index < 16; index++) {
- if (temp16 & 0x1) {
- ++number_of_interrupts;
- }
- temp16 >>= 1;
- }
- structure_size = SIZEOF_RESOURCE (acpi_resource_io) +
- (number_of_interrupts * sizeof (u32));
- break;
- case RESOURCE_DESC_DMA_FORMAT:
- /*
- * DMA Resource
- */
- buffer = byte_stream_buffer;
- bytes_consumed = 3;
- /*
- * Point past the descriptor
- */
- ++buffer;
- /*
- * Look at the number of bits set
- */
- temp8 = *buffer;
- for(index = 0; index < 8; index++) {
- if(temp8 & 0x1) {
- ++number_of_channels;
- }
- temp8 >>= 1;
- }
- structure_size = SIZEOF_RESOURCE (acpi_resource_dma) +
- (number_of_channels * sizeof (u32));
- break;
- case RESOURCE_DESC_START_DEPENDENT:
- /*
- * Start Dependent Functions Resource
- * Determine if it there are two or three trailing bytes
- */
- buffer = byte_stream_buffer;
- temp8 = *buffer;
- if(temp8 & 0x01) {
- bytes_consumed = 2;
- }
- else {
- bytes_consumed = 1;
- }
- structure_size = SIZEOF_RESOURCE (acpi_resource_start_dpf);
- break;
- case RESOURCE_DESC_END_DEPENDENT:
- /*
- * End Dependent Functions Resource
- */
- bytes_consumed = 1;
- structure_size = ACPI_RESOURCE_LENGTH;
- break;
- case RESOURCE_DESC_IO_PORT:
- /*
- * IO Port Resource
- */
- bytes_consumed = 8;
- structure_size = SIZEOF_RESOURCE (acpi_resource_io);
- break;
- case RESOURCE_DESC_FIXED_IO_PORT:
- /*
- * Fixed IO Port Resource
- */
- bytes_consumed = 4;
- structure_size = SIZEOF_RESOURCE (acpi_resource_fixed_io);
- break;
- case RESOURCE_DESC_SMALL_VENDOR:
- /*
- * Vendor Specific Resource
- */
- buffer = byte_stream_buffer;
- temp8 = *buffer;
- temp8 = (u8) (temp8 & 0x7);
- bytes_consumed = temp8 + 1;
- /*
- * Ensure a 32-bit boundary for the structure
- */
- temp8 = (u8) ROUND_UP_TO_32_bITS (temp8);
- structure_size = SIZEOF_RESOURCE (acpi_resource_vendor) +
- (temp8 * sizeof (u8));
- break;
- case RESOURCE_DESC_END_TAG:
- /*
- * End Tag
- */
- bytes_consumed = 2;
- structure_size = ACPI_RESOURCE_LENGTH;
- byte_stream_buffer_length = bytes_parsed;
- break;
- default:
- /*
- * If we get here, everything is out of sync,
- * so exit with an error
- */
- return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
- break;
- }
- /*
- * Update the return value and counter
- */
- buffer_size += structure_size;
- bytes_parsed += bytes_consumed;
- /*
- * Set the byte stream to point to the next resource
- */
- byte_stream_buffer += bytes_consumed;
- }
- /*
- * This is the data the caller needs
- */
- *size_needed = buffer_size;
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_rs_calculate_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_calculate_pci_routing_table_length (
- acpi_operand_object *package_object,
- u32 *buffer_size_needed)
- {
- u32 number_of_elements;
- u32 temp_size_needed = 0;
- acpi_operand_object **top_object_list;
- u32 index;
- acpi_operand_object *package_element;
- acpi_operand_object **sub_object_list;
- u8 name_found;
- u32 table_index;
- FUNCTION_TRACE ("Rs_calculate_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 == (*sub_object_list)->common.type) ||
- ((INTERNAL_TYPE_REFERENCE == (*sub_object_list)->common.type) &&
- ((*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 (pci_routing_table) - 4);
- /*
- * Was a String type found?
- */
- if (TRUE == name_found) {
- if (ACPI_TYPE_STRING == (*sub_object_list)->common.type) {
- /*
- * The length String.Length field includes the
- * terminating NULL
- */
- temp_size_needed += (*sub_object_list)->string.length;
- }
- 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 = ROUND_UP_TO_64_bITS (temp_size_needed);
- /*
- * Point to the next 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 (pci_routing_table);
- return_ACPI_STATUS (AE_OK);
- }