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linux_old1/drivers/acpi/resources/rsutils.c

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/*******************************************************************************
*
* Module Name: rsutils - Utilities for the resource manager
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2005, R. Byron Moore
* 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 <acpi/acnamesp.h>
#include <acpi/acresrc.h>
#define _COMPONENT ACPI_RESOURCES
ACPI_MODULE_NAME("rsutils")
/*******************************************************************************
*
* FUNCTION: acpi_rs_decode_bitmask
*
* PARAMETERS: Mask - Bitmask to decode
* List - Where the converted list is returned
*
* RETURN: Count of bits set (length of list)
*
* DESCRIPTION: Convert a bit mask into a list of values
*
******************************************************************************/
u8 acpi_rs_decode_bitmask(u16 mask, u8 * list)
{
acpi_native_uint i;
u8 bit_count;
/* Decode the mask bits */
for (i = 0, bit_count = 0; mask; i++) {
if (mask & 0x0001) {
list[bit_count] = (u8) i;
bit_count++;
}
mask >>= 1;
}
return (bit_count);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_encode_bitmask
*
* PARAMETERS: List - List of values to encode
* Count - Length of list
*
* RETURN: Encoded bitmask
*
* DESCRIPTION: Convert a list of values to an encoded bitmask
*
******************************************************************************/
u16 acpi_rs_encode_bitmask(u8 * list, u8 count)
{
acpi_native_uint i;
u16 mask;
/* Encode the list into a single bitmask */
for (i = 0, mask = 0; i < count; i++) {
mask |= (0x0001 << list[i]);
}
return (mask);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_move_data
*
* PARAMETERS: Destination - Pointer to the destination descriptor
* Source - Pointer to the source descriptor
* item_count - How many items to move
* move_type - Byte width
*
* RETURN: None
*
* DESCRIPTION: Move multiple data items from one descriptor to another. Handles
* alignment issues and endian issues if necessary, as configured
* via the ACPI_MOVE_* macros. (This is why a memcpy is not used)
*
******************************************************************************/
void
acpi_rs_move_data(void *destination, void *source, u16 item_count, u8 move_type)
{
acpi_native_uint i;
/* One move per item */
for (i = 0; i < item_count; i++) {
switch (move_type) {
/*
* For the 8-bit case, we can perform the move all at once
* since there are no alignment or endian issues
*/
case ACPI_RSC_MOVE8:
ACPI_MEMCPY(destination, source, item_count);
return;
/*
* 16-, 32-, and 64-bit cases must use the move macros that perform
* endian conversion and/or accomodate hardware that cannot perform
* misaligned memory transfers
*/
case ACPI_RSC_MOVE16:
ACPI_MOVE_16_TO_16(&((u16 *) destination)[i],
&((u16 *) source)[i]);
break;
case ACPI_RSC_MOVE32:
ACPI_MOVE_32_TO_32(&((u32 *) destination)[i],
&((u32 *) source)[i]);
break;
case ACPI_RSC_MOVE64:
ACPI_MOVE_64_TO_64(&((u64 *) destination)[i],
&((u64 *) source)[i]);
break;
default:
return;
}
}
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_resource_info
*
* PARAMETERS: resource_type - Byte 0 of a resource descriptor
*
* RETURN: Pointer to the resource conversion handler
*
* DESCRIPTION: Extract the Resource Type/Name from the first byte of
* a resource descriptor.
*
******************************************************************************/
struct acpi_resource_info *acpi_rs_get_resource_info(u8 resource_type)
{
struct acpi_resource_info *size_info;
ACPI_FUNCTION_ENTRY();
/* Determine if this is a small or large resource */
if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
/* Large Resource Type -- bits 6:0 contain the name */
if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
return (NULL);
}
size_info = &acpi_gbl_lg_resource_info[(resource_type &
ACPI_RESOURCE_NAME_LARGE_MASK)];
} else {
/* Small Resource Type -- bits 6:3 contain the name */
size_info = &acpi_gbl_sm_resource_info[((resource_type &
ACPI_RESOURCE_NAME_SMALL_MASK)
>> 3)];
}
/* Zero entry indicates an invalid resource type */
if (!size_info->minimum_internal_struct_length) {
return (NULL);
}
return (size_info);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_set_resource_length
*
* PARAMETERS: total_length - Length of the AML descriptor, including
* the header and length fields.
* Aml - Pointer to the raw AML descriptor
*
* RETURN: None
*
* DESCRIPTION: Set the resource_length field of an AML
* resource descriptor, both Large and Small descriptors are
* supported automatically. Note: Descriptor Type field must
* be valid.
*
******************************************************************************/
void
acpi_rs_set_resource_length(acpi_rsdesc_size total_length,
union aml_resource *aml)
{
acpi_rs_length resource_length;
ACPI_FUNCTION_ENTRY();
/* Determine if this is a small or large resource */
if (aml->small_header.descriptor_type & ACPI_RESOURCE_NAME_LARGE) {
/* Large Resource type -- bytes 1-2 contain the 16-bit length */
resource_length = (acpi_rs_length)
(total_length - sizeof(struct aml_resource_large_header));
/* Insert length into the Large descriptor length field */
ACPI_MOVE_16_TO_16(&aml->large_header.resource_length,
&resource_length);
} else {
/* Small Resource type -- bits 2:0 of byte 0 contain the length */
resource_length = (acpi_rs_length)
(total_length - sizeof(struct aml_resource_small_header));
/* Insert length into the descriptor type byte */
aml->small_header.descriptor_type = (u8)
/* Clear any existing length, preserving descriptor type bits */
((aml->small_header.
descriptor_type & ~ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK)
| resource_length);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_set_resource_header
*
* PARAMETERS: descriptor_type - Byte to be inserted as the type
* total_length - Length of the AML descriptor, including
* the header and length fields.
* Aml - Pointer to the raw AML descriptor
*
* RETURN: None
*
* DESCRIPTION: Set the descriptor_type and resource_length fields of an AML
* resource descriptor, both Large and Small descriptors are
* supported automatically
*
******************************************************************************/
void
acpi_rs_set_resource_header(u8 descriptor_type,
acpi_rsdesc_size total_length,
union aml_resource *aml)
{
ACPI_FUNCTION_ENTRY();
/* Set the Descriptor Type */
aml->small_header.descriptor_type = descriptor_type;
/* Set the Resource Length */
acpi_rs_set_resource_length(total_length, aml);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_strcpy
*
* PARAMETERS: Destination - Pointer to the destination string
* Source - Pointer to the source string
*
* RETURN: String length, including NULL terminator
*
* DESCRIPTION: Local string copy that returns the string length, saving a
* strcpy followed by a strlen.
*
******************************************************************************/
static u16 acpi_rs_strcpy(char *destination, char *source)
{
u16 i;
ACPI_FUNCTION_ENTRY();
for (i = 0; source[i]; i++) {
destination[i] = source[i];
}
destination[i] = 0;
/* Return string length including the NULL terminator */
return ((u16) (i + 1));
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_resource_source
*
* PARAMETERS: resource_length - Length field of the descriptor
* minimum_length - Minimum length of the descriptor (minus
* any optional fields)
* resource_source - Where the resource_source is returned
* Aml - Pointer to the raw AML descriptor
* string_ptr - (optional) where to store the actual
* resource_source string
*
* RETURN: Length of the string plus NULL terminator, rounded up to 32 bit
*
* DESCRIPTION: Copy the optional resource_source data from a raw AML descriptor
* to an internal resource descriptor
*
******************************************************************************/
acpi_rs_length
acpi_rs_get_resource_source(acpi_rs_length resource_length,
acpi_rs_length minimum_length,
struct acpi_resource_source * resource_source,
union aml_resource * aml, char *string_ptr)
{
acpi_rsdesc_size total_length;
u8 *aml_resource_source;
ACPI_FUNCTION_ENTRY();
total_length =
resource_length + sizeof(struct aml_resource_large_header);
aml_resource_source = ((u8 *) aml) + minimum_length;
/*
* resource_source is present if the length of the descriptor is longer than
* the minimum length.
*
* Note: Some resource descriptors will have an additional null, so
* we add 1 to the minimum length.
*/
if (total_length > (acpi_rsdesc_size) (minimum_length + 1)) {
/* Get the resource_source_index */
resource_source->index = aml_resource_source[0];
resource_source->string_ptr = string_ptr;
if (!string_ptr) {
/*
* String destination pointer is not specified; Set the String
* pointer to the end of the current resource_source structure.
*/
resource_source->string_ptr = (char *)
((u8 *) resource_source) +
sizeof(struct acpi_resource_source);
}
/*
* In order for the struct_size to fall on a 32-bit boundary, calculate
* the length of the string (+1 for the NULL terminator) and expand the
* struct_size to the next 32-bit boundary.
*
* Zero the entire area of the buffer.
*/
total_length =
ACPI_ROUND_UP_to_32_bITS(ACPI_STRLEN
((char *)&aml_resource_source[1]) +
1);
ACPI_MEMSET(resource_source->string_ptr, 0, total_length);
/* Copy the resource_source string to the destination */
resource_source->string_length =
acpi_rs_strcpy(resource_source->string_ptr,
(char *)&aml_resource_source[1]);
return ((acpi_rs_length) total_length);
} else {
/* resource_source is not present */
resource_source->index = 0;
resource_source->string_length = 0;
resource_source->string_ptr = NULL;
return (0);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_set_resource_source
*
* PARAMETERS: Aml - Pointer to the raw AML descriptor
* minimum_length - Minimum length of the descriptor (minus
* any optional fields)
* resource_source - Internal resource_source
*
* RETURN: Total length of the AML descriptor
*
* DESCRIPTION: Convert an optional resource_source from internal format to a
* raw AML resource descriptor
*
******************************************************************************/
acpi_rsdesc_size
acpi_rs_set_resource_source(union aml_resource * aml,
acpi_rs_length minimum_length,
struct acpi_resource_source * resource_source)
{
u8 *aml_resource_source;
acpi_rsdesc_size descriptor_length;
ACPI_FUNCTION_ENTRY();
descriptor_length = minimum_length;
/* Non-zero string length indicates presence of a resource_source */
if (resource_source->string_length) {
/* Point to the end of the AML descriptor */
aml_resource_source = ((u8 *) aml) + minimum_length;
/* Copy the resource_source_index */
aml_resource_source[0] = (u8) resource_source->index;
/* Copy the resource_source string */
ACPI_STRCPY((char *)&aml_resource_source[1],
resource_source->string_ptr);
/*
* Add the length of the string (+ 1 for null terminator) to the
* final descriptor length
*/
descriptor_length +=
((acpi_rsdesc_size) resource_source->string_length + 1);
}
/* Return the new total length of the AML descriptor */
return (descriptor_length);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_prt_method_data
*
* PARAMETERS: Handle - a handle to the containing object
* ret_buffer - a pointer to a buffer structure for the
* results
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the _PRT value of an object
* contained in an object specified by the handle passed in
*
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
******************************************************************************/
acpi_status
acpi_rs_get_prt_method_data(acpi_handle handle, struct acpi_buffer * ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE("rs_get_prt_method_data");
/* Parameters guaranteed valid by caller */
/* Execute the method, no parameters */
status = acpi_ut_evaluate_object(handle, METHOD_NAME__PRT,
ACPI_BTYPE_PACKAGE, &obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Create a resource linked list from the byte stream buffer that comes
* back from the _CRS method execution.
*/
status = acpi_rs_create_pci_routing_table(obj_desc, ret_buffer);
/* On exit, we must delete the object returned by evaluate_object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_crs_method_data
*
* PARAMETERS: Handle - a handle to the containing object
* ret_buffer - a pointer to a buffer structure for the
* results
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the _CRS value of an object
* contained in an object specified by the handle passed in
*
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
******************************************************************************/
acpi_status
acpi_rs_get_crs_method_data(acpi_handle handle, struct acpi_buffer *ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE("rs_get_crs_method_data");
/* Parameters guaranteed valid by caller */
/* Execute the method, no parameters */
status = acpi_ut_evaluate_object(handle, METHOD_NAME__CRS,
ACPI_BTYPE_BUFFER, &obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Make the call to create a resource linked list from the
* byte stream buffer that comes back from the _CRS method
* execution.
*/
status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
/* on exit, we must delete the object returned by evaluate_object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_prs_method_data
*
* PARAMETERS: Handle - a handle to the containing object
* ret_buffer - a pointer to a buffer structure for the
* results
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the _PRS value of an object
* contained in an object specified by the handle passed in
*
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
******************************************************************************/
#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_rs_get_prs_method_data(acpi_handle handle, struct acpi_buffer *ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE("rs_get_prs_method_data");
/* Parameters guaranteed valid by caller */
/* Execute the method, no parameters */
status = acpi_ut_evaluate_object(handle, METHOD_NAME__PRS,
ACPI_BTYPE_BUFFER, &obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Make the call to create a resource linked list from the
* byte stream buffer that comes back from the _CRS method
* execution.
*/
status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
/* on exit, we must delete the object returned by evaluate_object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
#endif /* ACPI_FUTURE_USAGE */
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_method_data
*
* PARAMETERS: Handle - a handle to the containing object
* Path - Path to method, relative to Handle
* ret_buffer - a pointer to a buffer structure for the
* results
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the _CRS or _PRS value of an
* object contained in an object specified by the handle passed in
*
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
******************************************************************************/
acpi_status
acpi_rs_get_method_data(acpi_handle handle,
char *path, struct acpi_buffer *ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE("rs_get_method_data");
/* Parameters guaranteed valid by caller */
/* Execute the method, no parameters */
status =
acpi_ut_evaluate_object(handle, path, ACPI_BTYPE_BUFFER, &obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Make the call to create a resource linked list from the
* byte stream buffer that comes back from the method
* execution.
*/
status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
/* On exit, we must delete the object returned by evaluate_object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_set_srs_method_data
*
* PARAMETERS: Handle - a handle to the containing object
* in_buffer - a pointer to a buffer structure of the
* parameter
*
* RETURN: Status
*
* DESCRIPTION: This function is called to set the _SRS of an object contained
* in an object specified by the handle passed in
*
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
******************************************************************************/
acpi_status
acpi_rs_set_srs_method_data(acpi_handle handle, struct acpi_buffer *in_buffer)
{
struct acpi_parameter_info info;
union acpi_operand_object *params[2];
acpi_status status;
struct acpi_buffer buffer;
ACPI_FUNCTION_TRACE("rs_set_srs_method_data");
/* Parameters guaranteed valid by caller */
/*
* The in_buffer parameter will point to a linked list of
* resource parameters. It needs to be formatted into a
* byte stream to be sent in as an input parameter to _SRS
*
* Convert the linked list into a byte stream
*/
buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
status = acpi_rs_create_aml_resources(in_buffer->pointer, &buffer);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Init the param object */
params[0] = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
if (!params[0]) {
acpi_os_free(buffer.pointer);
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Set up the parameter object */
params[0]->buffer.length = (u32) buffer.length;
params[0]->buffer.pointer = buffer.pointer;
params[0]->common.flags = AOPOBJ_DATA_VALID;
params[1] = NULL;
info.node = handle;
info.parameters = params;
info.parameter_type = ACPI_PARAM_ARGS;
/* Execute the method, no return value */
status = acpi_ns_evaluate_relative(METHOD_NAME__SRS, &info);
if (ACPI_SUCCESS(status)) {
/* Delete any return object (especially if implicit_return is enabled) */
if (info.return_object) {
acpi_ut_remove_reference(info.return_object);
}
}
/* Clean up and return the status from acpi_ns_evaluate_relative */
acpi_ut_remove_reference(params[0]);
return_ACPI_STATUS(status);
}
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