linux/drivers/acpi/namespace/nsnames.c

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/*******************************************************************************
*
* Module Name: nsnames - Name manipulation and search
*
******************************************************************************/
/*
* 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/amlcode.h>
#include <acpi/acnamesp.h>
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME ("nsnames")
ACPICA 20050408 from Bob Moore Fixed three cases in the interpreter where an "index" argument to an ASL function was still (internally) 32 bits instead of the required 64 bits. This was the Index argument to the Index, Mid, and Match operators. The "strupr" function is now permanently local (acpi_ut_strupr), since this is not a POSIX-defined function and not present in most kernel-level C libraries. References to the C library strupr function have been removed from the headers. Completed the deployment of static functions/prototypes. All prototypes with the static attribute have been moved from the headers to the owning C file. ACPICA 20050329 from Bob Moore An error is now generated if an attempt is made to create a Buffer Field of length zero (A CreateField with a length operand of zero.) The interpreter now issues a warning whenever executable code at the module level is detected during ACPI table load. This will give some idea of the prevalence of this type of code. Implemented support for references to named objects (other than control methods) within package objects. Enhanced package object output for the debug object. Package objects are now completely dumped, showing all elements. Enhanced miscellaneous object output for the debug object. Any object can now be written to the debug object (for example, a device object can be written, and the type of the object will be displayed.) The "static" qualifier has been added to all local functions across the core subsystem. The number of "long" lines (> 80 chars) within the source has been significantly reduced, by about 1/3. Cleaned up all header files to ensure that all CA/iASL functions are prototyped (even static functions) and the formatting is consistent. Two new header files have been added, acopcode.h and acnames.h. Removed several obsolete functions that were no longer used. Signed-off-by: Len Brown <len.brown@intel.com>
2005-04-19 02:49:35 +00:00
/* Local prototypes */
static void
acpi_ns_build_external_path (
struct acpi_namespace_node *node,
acpi_size size,
char *name_buffer);
/*******************************************************************************
*
* FUNCTION: acpi_ns_build_external_path
*
* PARAMETERS: Node - NS node whose pathname is needed
* Size - Size of the pathname
* *name_buffer - Where to return the pathname
*
* RETURN: Places the pathname into the name_buffer, in external format
* (name segments separated by path separators)
*
* DESCRIPTION: Generate a full pathaname
*
******************************************************************************/
ACPICA 20050408 from Bob Moore Fixed three cases in the interpreter where an "index" argument to an ASL function was still (internally) 32 bits instead of the required 64 bits. This was the Index argument to the Index, Mid, and Match operators. The "strupr" function is now permanently local (acpi_ut_strupr), since this is not a POSIX-defined function and not present in most kernel-level C libraries. References to the C library strupr function have been removed from the headers. Completed the deployment of static functions/prototypes. All prototypes with the static attribute have been moved from the headers to the owning C file. ACPICA 20050329 from Bob Moore An error is now generated if an attempt is made to create a Buffer Field of length zero (A CreateField with a length operand of zero.) The interpreter now issues a warning whenever executable code at the module level is detected during ACPI table load. This will give some idea of the prevalence of this type of code. Implemented support for references to named objects (other than control methods) within package objects. Enhanced package object output for the debug object. Package objects are now completely dumped, showing all elements. Enhanced miscellaneous object output for the debug object. Any object can now be written to the debug object (for example, a device object can be written, and the type of the object will be displayed.) The "static" qualifier has been added to all local functions across the core subsystem. The number of "long" lines (> 80 chars) within the source has been significantly reduced, by about 1/3. Cleaned up all header files to ensure that all CA/iASL functions are prototyped (even static functions) and the formatting is consistent. Two new header files have been added, acopcode.h and acnames.h. Removed several obsolete functions that were no longer used. Signed-off-by: Len Brown <len.brown@intel.com>
2005-04-19 02:49:35 +00:00
static void
acpi_ns_build_external_path (
struct acpi_namespace_node *node,
acpi_size size,
char *name_buffer)
{
acpi_size index;
struct acpi_namespace_node *parent_node;
ACPI_FUNCTION_NAME ("ns_build_external_path");
/* Special case for root */
index = size - 1;
if (index < ACPI_NAME_SIZE) {
name_buffer[0] = AML_ROOT_PREFIX;
name_buffer[1] = 0;
return;
}
/* Store terminator byte, then build name backwards */
parent_node = node;
name_buffer[index] = 0;
while ((index > ACPI_NAME_SIZE) && (parent_node != acpi_gbl_root_node)) {
index -= ACPI_NAME_SIZE;
/* Put the name into the buffer */
ACPI_MOVE_32_TO_32 ((name_buffer + index), &parent_node->name);
parent_node = acpi_ns_get_parent_node (parent_node);
/* Prefix name with the path separator */
index--;
name_buffer[index] = ACPI_PATH_SEPARATOR;
}
/* Overwrite final separator with the root prefix character */
name_buffer[index] = AML_ROOT_PREFIX;
if (index != 0) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Could not construct pathname; index=%X, size=%X, Path=%s\n",
(u32) index, (u32) size, &name_buffer[size]));
}
return;
}
#ifdef ACPI_DEBUG_OUTPUT
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_external_pathname
*
ACPICA 20050408 from Bob Moore Fixed three cases in the interpreter where an "index" argument to an ASL function was still (internally) 32 bits instead of the required 64 bits. This was the Index argument to the Index, Mid, and Match operators. The "strupr" function is now permanently local (acpi_ut_strupr), since this is not a POSIX-defined function and not present in most kernel-level C libraries. References to the C library strupr function have been removed from the headers. Completed the deployment of static functions/prototypes. All prototypes with the static attribute have been moved from the headers to the owning C file. ACPICA 20050329 from Bob Moore An error is now generated if an attempt is made to create a Buffer Field of length zero (A CreateField with a length operand of zero.) The interpreter now issues a warning whenever executable code at the module level is detected during ACPI table load. This will give some idea of the prevalence of this type of code. Implemented support for references to named objects (other than control methods) within package objects. Enhanced package object output for the debug object. Package objects are now completely dumped, showing all elements. Enhanced miscellaneous object output for the debug object. Any object can now be written to the debug object (for example, a device object can be written, and the type of the object will be displayed.) The "static" qualifier has been added to all local functions across the core subsystem. The number of "long" lines (> 80 chars) within the source has been significantly reduced, by about 1/3. Cleaned up all header files to ensure that all CA/iASL functions are prototyped (even static functions) and the formatting is consistent. Two new header files have been added, acopcode.h and acnames.h. Removed several obsolete functions that were no longer used. Signed-off-by: Len Brown <len.brown@intel.com>
2005-04-19 02:49:35 +00:00
* PARAMETERS: Node - Namespace node whose pathname is needed
*
* RETURN: Pointer to storage containing the fully qualified name of
* the node, In external format (name segments separated by path
* separators.)
*
* DESCRIPTION: Used for debug printing in acpi_ns_search_table().
*
******************************************************************************/
char *
acpi_ns_get_external_pathname (
struct acpi_namespace_node *node)
{
char *name_buffer;
acpi_size size;
ACPI_FUNCTION_TRACE_PTR ("ns_get_external_pathname", node);
/* Calculate required buffer size based on depth below root */
size = acpi_ns_get_pathname_length (node);
/* Allocate a buffer to be returned to caller */
name_buffer = ACPI_MEM_CALLOCATE (size);
if (!name_buffer) {
ACPI_REPORT_ERROR (("ns_get_table_pathname: allocation failure\n"));
return_PTR (NULL);
}
/* Build the path in the allocated buffer */
acpi_ns_build_external_path (node, size, name_buffer);
return_PTR (name_buffer);
}
#endif
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_pathname_length
*
* PARAMETERS: Node - Namespace node
*
* RETURN: Length of path, including prefix
*
* DESCRIPTION: Get the length of the pathname string for this node
*
******************************************************************************/
acpi_size
acpi_ns_get_pathname_length (
struct acpi_namespace_node *node)
{
acpi_size size;
struct acpi_namespace_node *next_node;
ACPI_FUNCTION_ENTRY ();
/*
* Compute length of pathname as 5 * number of name segments.
* Go back up the parent tree to the root
*/
size = 0;
next_node = node;
while (next_node && (next_node != acpi_gbl_root_node)) {
size += ACPI_PATH_SEGMENT_LENGTH;
next_node = acpi_ns_get_parent_node (next_node);
}
if (!size) {
size = 1; /* Root node case */
}
return (size + 1); /* +1 for null string terminator */
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_handle_to_pathname
*
* PARAMETERS: target_handle - Handle of named object whose name is
* to be found
* Buffer - Where the pathname is returned
*
* RETURN: Status, Buffer is filled with pathname if status is AE_OK
*
* DESCRIPTION: Build and return a full namespace pathname
*
******************************************************************************/
acpi_status
acpi_ns_handle_to_pathname (
acpi_handle target_handle,
struct acpi_buffer *buffer)
{
acpi_status status;
struct acpi_namespace_node *node;
acpi_size required_size;
ACPI_FUNCTION_TRACE_PTR ("ns_handle_to_pathname", target_handle);
node = acpi_ns_map_handle_to_node (target_handle);
if (!node) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Determine size required for the caller buffer */
required_size = acpi_ns_get_pathname_length (node);
/* Validate/Allocate/Clear caller buffer */
status = acpi_ut_initialize_buffer (buffer, required_size);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* Build the path in the caller buffer */
acpi_ns_build_external_path (node, required_size, buffer->pointer);
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s [%X] \n",
(char *) buffer->pointer, (u32) required_size));
return_ACPI_STATUS (AE_OK);
}