- 根目录:
- drivers
- acpi
- acpica
- rscreate.c
/*******************************************************************************
*
* Module Name: rscreate - Create resource lists/tables
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2014, 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("rscreate")
/*******************************************************************************
*
* FUNCTION: acpi_buffer_to_resource
*
* PARAMETERS: aml_buffer - Pointer to the resource byte stream
* aml_buffer_length - Length of the aml_buffer
* resource_ptr - Where the converted resource is returned
*
* RETURN: Status
*
* DESCRIPTION: Convert a raw AML buffer to a resource list
*
******************************************************************************/
acpi_status
acpi_buffer_to_resource(u8 *aml_buffer,
u16 aml_buffer_length,
struct acpi_resource **resource_ptr)
{
acpi_status status;
acpi_size list_size_needed;
void *resource;
void *current_resource_ptr;
ACPI_FUNCTION_TRACE(acpi_buffer_to_resource);
/*
* Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag
* is not required here.
*/
/* Get the required length for the converted resource */
status = acpi_rs_get_list_length(aml_buffer, aml_buffer_length,
&list_size_needed);
if (status == AE_AML_NO_RESOURCE_END_TAG) {
status = AE_OK;
}
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Allocate a buffer for the converted resource */
resource = ACPI_ALLOCATE_ZEROED(list_size_needed);
current_resource_ptr = resource;
if (!resource) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Perform the AML-to-Resource conversion */
status = acpi_ut_walk_aml_resources(NULL, aml_buffer, aml_buffer_length,
acpi_rs_convert_aml_to_resources,
¤t_resource_ptr);
if (status == AE_AML_NO_RESOURCE_END_TAG) {
status = AE_OK;
}
if (ACPI_FAILURE(status)) {
ACPI_FREE(resource);
} else {
*resource_ptr = resource;
}
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_buffer_to_resource)
/*******************************************************************************
*
* FUNCTION: acpi_rs_create_resource_list
*
* PARAMETERS: aml_buffer - Pointer to the resource byte stream
* output_buffer - Pointer to the user's 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(union acpi_operand_object *aml_buffer,
struct acpi_buffer *output_buffer)
{
acpi_status status;
u8 *aml_start;
acpi_size list_size_needed = 0;
u32 aml_buffer_length;
void *resource;
ACPI_FUNCTION_TRACE(rs_create_resource_list);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlBuffer = %p\n", aml_buffer));
/* Params already validated, so we don't re-validate here */
aml_buffer_length = aml_buffer->buffer.length;
aml_start = aml_buffer->buffer.pointer;
/*
* Pass the aml_buffer into a module that can calculate
* the buffer size needed for the linked list
*/
status = acpi_rs_get_list_length(aml_start, aml_buffer_length,
&list_size_needed);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X ListSizeNeeded=%X\n",
status, (u32) list_size_needed));
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Validate/Allocate/Clear caller buffer */
status = acpi_ut_initialize_buffer(output_buffer, list_size_needed);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Do the conversion */
resource = output_buffer->pointer;
status = acpi_ut_walk_aml_resources(NULL, aml_start, aml_buffer_length,
acpi_rs_convert_aml_to_resources,
&resource);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
output_buffer->pointer, (u32) output_buffer->length));
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_create_pci_routing_table
*
* PARAMETERS: package_object - Pointer to a package containing one
* of more ACPI_OPERAND_OBJECTs
* output_buffer - Pointer to the user's 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 union acpi_operand_object package and creates a
* linked list of PCI interrupt descriptions
*
* NOTE: It is the caller's responsibility to ensure that the start of the
* output buffer is aligned properly (if necessary).
*
******************************************************************************/
acpi_status
acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
struct acpi_buffer *output_buffer)
{
u8 *buffer;
union acpi_operand_object **top_object_list;
union acpi_operand_object **sub_object_list;
union acpi_operand_object *obj_desc;
acpi_size buffer_size_needed = 0;
u32 number_of_elements;
u32 index;
struct acpi_pci_routing_table *user_prt;
struct acpi_namespace_node *node;
acpi_status status;
struct acpi_buffer path_buffer;
ACPI_FUNCTION_TRACE(rs_create_pci_routing_table);
/* Params already validated, so we don't re-validate here */
/* Get the required buffer length */
status = acpi_rs_get_pci_routing_table_length(package_object,
&buffer_size_needed);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "BufferSizeNeeded = %X\n",
(u32) buffer_size_needed));
/* Validate/Allocate/Clear caller buffer */
status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Loop through the ACPI_INTERNAL_OBJECTS - Each object should be a
* package that in turn contains an u64 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;
buffer = output_buffer->pointer;
user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
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 = ACPI_CAST_PTR(struct acpi_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(struct acpi_pci_routing_table) - 4);
/* Each subpackage must be of length 4 */
if ((*top_object_list)->package.count != 4) {
ACPI_ERROR((AE_INFO,
"(PRT[%u]) Need package of length 4, found length %u",
index, (*top_object_list)->package.count));
return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT);
}
/*
* Dereference the subpackage.
* The sub_object_list will now point to an array of the four IRQ
* elements: [Address, Pin, Source, source_index]
*/
sub_object_list = (*top_object_list)->package.elements;
/* 1) First subobject: Dereference the PRT.Address */
obj_desc = sub_object_list[0];
if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
ACPI_ERROR((AE_INFO,
"(PRT[%u].Address) Need Integer, found %s",
index,
acpi_ut_get_object_type_name(obj_desc)));
return_ACPI_STATUS(AE_BAD_DATA);
}
user_prt->address = obj_desc->integer.value;
/* 2) Second subobject: Dereference the PRT.Pin */
obj_desc = sub_object_list[1];
if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
ACPI_ERROR((AE_INFO,
"(PRT[%u].Pin) Need Integer, found %s",
index,
acpi_ut_get_object_type_name(obj_desc)));
return_ACPI_STATUS(AE_BAD_DATA);
}
user_prt->pin = (u32) obj_desc->integer.value;
/*
* 3) Third subobject: Dereference the PRT.source_name
* The name may be unresolved (slack mode), so allow a null object
*/
obj_desc = sub_object_list[2];
if (obj_desc) {
switch (obj_desc->common.type) {
case ACPI_TYPE_LOCAL_REFERENCE:
if (obj_desc->reference.class !=
ACPI_REFCLASS_NAME) {
ACPI_ERROR((AE_INFO,
"(PRT[%u].Source) Need name, found Reference Class 0x%X",
index,
obj_desc->reference.class));
return_ACPI_STATUS(AE_BAD_DATA);
}
node = obj_desc->reference.node;
/* Use *remaining* length of the buffer as max for pathname */
path_buffer.length = output_buffer->length -
(u32) ((u8 *) user_prt->source -
(u8 *) output_buffer->pointer);
path_buffer.pointer = user_prt->source;
status =
acpi_ns_handle_to_pathname((acpi_handle)
node,
&path_buffer);
/* +1 to include null terminator */
user_prt->length +=
(u32) ACPI_STRLEN(user_prt->source) + 1;
break;
case ACPI_TYPE_STRING:
ACPI_STRCPY(user_prt->source,
obj_desc->string.pointer);
/*
* Add to the Length field the length of the string
* (add 1 for terminator)
*/
user_prt->length += obj_desc->string.length + 1;
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_ERROR((AE_INFO,
"(PRT[%u].Source) Need Ref/String/Integer, found %s",
index,
acpi_ut_get_object_type_name
(obj_desc)));
return_ACPI_STATUS(AE_BAD_DATA);
}
}
/* Now align the current length */
user_prt->length =
(u32) ACPI_ROUND_UP_TO_64BIT(user_prt->length);
/* 4) Fourth subobject: Dereference the PRT.source_index */
obj_desc = sub_object_list[3];
if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
ACPI_ERROR((AE_INFO,
"(PRT[%u].SourceIndex) Need Integer, found %s",
index,
acpi_ut_get_object_type_name(obj_desc)));
return_ACPI_STATUS(AE_BAD_DATA);
}
user_prt->source_index = (u32) obj_desc->integer.value;
/* Point to the next union acpi_operand_object in the top level package */
top_object_list++;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
output_buffer->pointer, (u32) output_buffer->length));
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_create_aml_resources
*
* PARAMETERS: resource_list - Pointer to the resource list buffer
* output_buffer - Where the AML buffer is returned
*
* 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: Converts a list of device resources to an AML bytestream
* to be used as input for the _SRS control method.
*
******************************************************************************/
acpi_status
acpi_rs_create_aml_resources(struct acpi_buffer *resource_list,
struct acpi_buffer *output_buffer)
{
acpi_status status;
acpi_size aml_size_needed = 0;
ACPI_FUNCTION_TRACE(rs_create_aml_resources);
/* Params already validated, no need to re-validate here */
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ResourceList Buffer = %p\n",
resource_list->pointer));
/* Get the buffer size needed for the AML byte stream */
status = acpi_rs_get_aml_length(resource_list->pointer,
resource_list->length,
&aml_size_needed);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s\n",
(u32)aml_size_needed, acpi_format_exception(status)));
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Validate/Allocate/Clear caller buffer */
status = acpi_ut_initialize_buffer(output_buffer, aml_size_needed);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Do the conversion */
status = acpi_rs_convert_resources_to_aml(resource_list->pointer,
aml_size_needed,
output_buffer->pointer);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
output_buffer->pointer, (u32) output_buffer->length));
return_ACPI_STATUS(AE_OK);
}