rscreate.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:13k
- /*******************************************************************************
- *
- * Module Name: rscreate - Create resource lists/tables
- * $Revision: 36 $
- *
- ******************************************************************************/
- /*
- * 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 ("rscreate")
- /*******************************************************************************
- *
- * FUNCTION: Acpi_rs_create_resource_list
- *
- * PARAMETERS: Byte_stream_buffer - Pointer to the resource byte stream
- * Output_buffer - Pointer to the user's buffer
- * Output_buffer_length - Pointer to the size of Output_buffer
- *
- * RETURN: Status - AE_OK if okay, else a valid acpi_status code
- * If Output_buffer is not large enough, Output_buffer_length
- * indicates how large Output_buffer should be, else it
- * indicates how may u8 elements of Output_buffer are valid.
- *
- * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method
- * execution and parses the stream to create a linked list
- * of device resources.
- *
- ******************************************************************************/
- acpi_status
- acpi_rs_create_resource_list (
- acpi_operand_object *byte_stream_buffer,
- u8 *output_buffer,
- u32 *output_buffer_length)
- {
- acpi_status status;
- u8 *byte_stream_start;
- u32 list_size_needed = 0;
- u32 byte_stream_buffer_length;
- FUNCTION_TRACE ("Rs_create_resource_list");
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Byte_stream_buffer = %pn", byte_stream_buffer));
- /*
- * Params already validated, so we don't re-validate here
- */
- byte_stream_buffer_length = byte_stream_buffer->buffer.length;
- byte_stream_start = byte_stream_buffer->buffer.pointer;
- /*
- * Pass the Byte_stream_buffer into a module that can calculate
- * the buffer size needed for the linked list
- */
- status = acpi_rs_calculate_list_length (byte_stream_start, byte_stream_buffer_length,
- &list_size_needed);
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Status=%X List_size_needed=%Xn",
- status, list_size_needed));
- /*
- * Exit with the error passed back
- */
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /*
- * If the linked list will fit into the available buffer
- * call to fill in the list
- */
- if (list_size_needed <= *output_buffer_length) {
- /*
- * Zero out the return buffer before proceeding
- */
- MEMSET (output_buffer, 0x00, *output_buffer_length);
- status = acpi_rs_byte_stream_to_list (byte_stream_start, byte_stream_buffer_length,
- &output_buffer);
- /*
- * Exit with the error passed back
- */
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Output_buffer = %pn", output_buffer));
- }
- else {
- *output_buffer_length = list_size_needed;
- return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
- }
- *output_buffer_length = list_size_needed;
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_rs_create_pci_routing_table
- *
- * PARAMETERS: Package_object - Pointer to an acpi_operand_object
- * package
- * Output_buffer - Pointer to the user's buffer
- * Output_buffer_length - Size of Output_buffer
- *
- * RETURN: Status AE_OK if okay, else a valid acpi_status code.
- * If the Output_buffer is too small, the error will be
- * AE_BUFFER_OVERFLOW and Output_buffer_length will point
- * to the size buffer needed.
- *
- * DESCRIPTION: Takes the acpi_operand_object package and creates a
- * linked list of PCI interrupt descriptions
- *
- ******************************************************************************/
- acpi_status
- acpi_rs_create_pci_routing_table (
- acpi_operand_object *package_object,
- u8 *output_buffer,
- u32 *output_buffer_length)
- {
- u8 *buffer = output_buffer;
- acpi_operand_object **top_object_list = NULL;
- acpi_operand_object **sub_object_list = NULL;
- acpi_operand_object *package_element = NULL;
- u32 buffer_size_needed = 0;
- u32 number_of_elements = 0;
- u32 index = 0;
- pci_routing_table *user_prt = NULL;
- acpi_namespace_node *node;
- acpi_status status;
- FUNCTION_TRACE ("Rs_create_pci_routing_table");
- /*
- * Params already validated, so we don't re-validate here
- */
- status = acpi_rs_calculate_pci_routing_table_length (package_object,
- &buffer_size_needed);
- if (!ACPI_SUCCESS(status)) {
- return_ACPI_STATUS (status);
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Buffer_size_needed = %Xn", buffer_size_needed));
- /*
- * If the data will fit into the available buffer
- * call to fill in the list
- */
- if (buffer_size_needed <= *output_buffer_length) {
- /*
- * Zero out the return buffer before proceeding
- */
- MEMSET (output_buffer, 0x00, *output_buffer_length);
- /*
- * Loop through the ACPI_INTERNAL_OBJECTS - Each object should
- * contain a u32 Address, a u8 Pin, a Name and a u8
- * Source_index.
- */
- top_object_list = package_object->package.elements;
- number_of_elements = package_object->package.count;
- user_prt = (pci_routing_table *) buffer;
- buffer = ROUND_PTR_UP_TO_8 (buffer, u8);
- for (index = 0; index < number_of_elements; index++) {
- /*
- * Point User_prt past this current structure
- *
- * NOTE: On the first iteration, User_prt->Length will
- * be zero because we cleared the return buffer earlier
- */
- buffer += user_prt->length;
- user_prt = (pci_routing_table *) buffer;
- /*
- * Fill in the Length field with the information we
- * have at this point.
- * The minus four is to subtract the size of the
- * u8 Source[4] member because it is added below.
- */
- user_prt->length = (sizeof (pci_routing_table) -4);
- /*
- * 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;
- /*
- * 1) First subobject: Dereference the Address
- */
- if (ACPI_TYPE_INTEGER == (*sub_object_list)->common.type) {
- user_prt->address = (*sub_object_list)->integer.value;
- }
- else {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Need Integer, found %sn",
- acpi_ut_get_type_name ((*sub_object_list)->common.type)));
- return_ACPI_STATUS (AE_BAD_DATA);
- }
- /*
- * 2) Second subobject: Dereference the Pin
- */
- sub_object_list++;
- if (ACPI_TYPE_INTEGER == (*sub_object_list)->common.type) {
- user_prt->pin = (u32) (*sub_object_list)->integer.value;
- }
- else {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Need Integer, found %sn",
- acpi_ut_get_type_name ((*sub_object_list)->common.type)));
- return_ACPI_STATUS (AE_BAD_DATA);
- }
- /*
- * 3) Third subobject: Dereference the Source Name
- */
- sub_object_list++;
- switch ((*sub_object_list)->common.type) {
- case INTERNAL_TYPE_REFERENCE:
- if ((*sub_object_list)->reference.opcode != AML_INT_NAMEPATH_OP) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Need name, found reference op %Xn",
- (*sub_object_list)->reference.opcode));
- return_ACPI_STATUS (AE_BAD_DATA);
- }
- node = (*sub_object_list)->reference.node;
- /* TBD: use *remaining* length of the buffer! */
- status = acpi_ns_handle_to_pathname ((acpi_handle *) node,
- output_buffer_length, user_prt->source);
- user_prt->length += STRLEN (user_prt->source) + 1; /* include null terminator */
- break;
- case ACPI_TYPE_STRING:
- STRCPY (user_prt->source,
- (*sub_object_list)->string.pointer);
- /*
- * Add to the Length field the length of the string
- */
- user_prt->length += (*sub_object_list)->string.length;
- break;
- case ACPI_TYPE_INTEGER:
- /*
- * If this is a number, then the Source Name
- * is NULL, since the entire buffer was zeroed
- * out, we can leave this alone.
- */
- /*
- * Add to the Length field the length of
- * the u32 NULL
- */
- user_prt->length += sizeof (u32);
- break;
- default:
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Need Integer, found %sn",
- acpi_ut_get_type_name ((*sub_object_list)->common.type)));
- return_ACPI_STATUS (AE_BAD_DATA);
- break;
- }
- /* Now align the current length */
- user_prt->length = ROUND_UP_TO_64_bITS (user_prt->length);
- /*
- * 4) Fourth subobject: Dereference the Source Index
- */
- sub_object_list++;
- if (ACPI_TYPE_INTEGER == (*sub_object_list)->common.type) {
- user_prt->source_index = (u32) (*sub_object_list)->integer.value;
- }
- else {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Need Integer, found %sn",
- acpi_ut_get_type_name ((*sub_object_list)->common.type)));
- return_ACPI_STATUS (AE_BAD_DATA);
- }
- /*
- * Point to the next acpi_operand_object
- */
- top_object_list++;
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Output_buffer = %pn", output_buffer));
- }
- else {
- *output_buffer_length = buffer_size_needed;
- return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
- }
- /*
- * Report the amount of buffer used
- */
- *output_buffer_length = buffer_size_needed;
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_rs_create_byte_stream
- *
- * PARAMETERS: Linked_list_buffer - Pointer to the resource linked list
- * Output_buffer - Pointer to the user's buffer
- * Output_buffer_length - Size of Output_buffer
- *
- * RETURN: Status AE_OK if okay, else a valid acpi_status code.
- * If the Output_buffer is too small, the error will be
- * AE_BUFFER_OVERFLOW and Output_buffer_length will point
- * to the size buffer needed.
- *
- * DESCRIPTION: Takes the linked list of device resources and
- * creates a bytestream to be used as input for the
- * _SRS control method.
- *
- ******************************************************************************/
- acpi_status
- acpi_rs_create_byte_stream (
- acpi_resource *linked_list_buffer,
- u8 *output_buffer,
- u32 *output_buffer_length)
- {
- acpi_status status;
- u32 byte_stream_size_needed = 0;
- FUNCTION_TRACE ("Rs_create_byte_stream");
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Linked_list_buffer = %pn", linked_list_buffer));
- /*
- * Params already validated, so we don't re-validate here
- *
- * Pass the Linked_list_buffer into a module that can calculate
- * the buffer size needed for the byte stream.
- */
- status = acpi_rs_calculate_byte_stream_length (linked_list_buffer,
- &byte_stream_size_needed);
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Byte_stream_size_needed=%X, %sn",
- byte_stream_size_needed, acpi_format_exception (status)));
- /*
- * Exit with the error passed back
- */
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /*
- * If the linked list will fit into the available buffer
- * call to fill in the list
- */
- if (byte_stream_size_needed <= *output_buffer_length) {
- /*
- * Zero out the return buffer before proceeding
- */
- MEMSET (output_buffer, 0x00, *output_buffer_length);
- status = acpi_rs_list_to_byte_stream (linked_list_buffer, byte_stream_size_needed,
- &output_buffer);
- /*
- * Exit with the error passed back
- */
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Output_buffer = %pn", output_buffer));
- }
- else {
- *output_buffer_length = byte_stream_size_needed;
- return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
- }
- return_ACPI_STATUS (AE_OK);
- }