306 lines
9.6 KiB
C
306 lines
9.6 KiB
C
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/*******************************************************************************
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*
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* Module Name: nsnames - Name manipulation and search
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2016, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "amlcode.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsnames")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_get_external_pathname
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*
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* PARAMETERS: node - Namespace node whose pathname is needed
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*
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* RETURN: Pointer to storage containing the fully qualified name of
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* the node, In external format (name segments separated by path
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* separators.)
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*
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* DESCRIPTION: Used to obtain the full pathname to a namespace node, usually
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* for error and debug statements.
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*
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******************************************************************************/
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char *acpi_ns_get_external_pathname(struct acpi_namespace_node *node)
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{
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char *name_buffer;
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ACPI_FUNCTION_TRACE_PTR(ns_get_external_pathname, node);
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name_buffer = acpi_ns_get_normalized_pathname(node, FALSE);
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return_PTR(name_buffer);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_get_pathname_length
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*
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* PARAMETERS: node - Namespace node
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*
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* RETURN: Length of path, including prefix
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*
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* DESCRIPTION: Get the length of the pathname string for this node
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*
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******************************************************************************/
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acpi_size acpi_ns_get_pathname_length(struct acpi_namespace_node *node)
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{
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acpi_size size;
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ACPI_FUNCTION_ENTRY();
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size = acpi_ns_build_normalized_path(node, NULL, 0, FALSE);
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return (size);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_handle_to_pathname
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*
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* PARAMETERS: target_handle - Handle of named object whose name is
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* to be found
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* buffer - Where the pathname is returned
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* no_trailing - Remove trailing '_' for each name
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* segment
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*
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* RETURN: Status, Buffer is filled with pathname if status is AE_OK
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*
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* DESCRIPTION: Build and return a full namespace pathname
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*
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******************************************************************************/
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acpi_status
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acpi_ns_handle_to_pathname(acpi_handle target_handle,
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struct acpi_buffer *buffer, u8 no_trailing)
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{
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acpi_status status;
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struct acpi_namespace_node *node;
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acpi_size required_size;
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ACPI_FUNCTION_TRACE_PTR(ns_handle_to_pathname, target_handle);
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node = acpi_ns_validate_handle(target_handle);
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if (!node) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Determine size required for the caller buffer */
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required_size =
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acpi_ns_build_normalized_path(node, NULL, 0, no_trailing);
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if (!required_size) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Validate/Allocate/Clear caller buffer */
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status = acpi_ut_initialize_buffer(buffer, required_size);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Build the path in the caller buffer */
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(void)acpi_ns_build_normalized_path(node, buffer->pointer,
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required_size, no_trailing);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%s [%X]\n",
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(char *)buffer->pointer, (u32) required_size));
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_build_normalized_path
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*
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* PARAMETERS: node - Namespace node
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* full_path - Where the path name is returned
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* path_size - Size of returned path name buffer
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* no_trailing - Remove trailing '_' from each name segment
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*
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* RETURN: Return 1 if the AML path is empty, otherwise returning (length
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* of pathname + 1) which means the 'FullPath' contains a trailing
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* null.
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*
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* DESCRIPTION: Build and return a full namespace pathname.
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* Note that if the size of 'FullPath' isn't large enough to
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* contain the namespace node's path name, the actual required
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* buffer length is returned, and it should be greater than
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* 'PathSize'. So callers are able to check the returning value
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* to determine the buffer size of 'FullPath'.
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*
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******************************************************************************/
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u32
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acpi_ns_build_normalized_path(struct acpi_namespace_node *node,
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char *full_path, u32 path_size, u8 no_trailing)
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{
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u32 length = 0, i;
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char name[ACPI_NAME_SIZE];
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u8 do_no_trailing;
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char c, *left, *right;
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struct acpi_namespace_node *next_node;
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ACPI_FUNCTION_TRACE_PTR(ns_build_normalized_path, node);
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#define ACPI_PATH_PUT8(path, size, byte, length) \
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do { \
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if ((length) < (size)) \
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{ \
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(path)[(length)] = (byte); \
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} \
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(length)++; \
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} while (0)
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/*
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* Make sure the path_size is correct, so that we don't need to
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* validate both full_path and path_size.
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*/
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if (!full_path) {
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path_size = 0;
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}
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if (!node) {
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goto build_trailing_null;
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}
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next_node = node;
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while (next_node && next_node != acpi_gbl_root_node) {
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if (next_node != node) {
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ACPI_PATH_PUT8(full_path, path_size,
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AML_DUAL_NAME_PREFIX, length);
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}
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ACPI_MOVE_32_TO_32(name, &next_node->name);
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do_no_trailing = no_trailing;
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for (i = 0; i < 4; i++) {
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c = name[4 - i - 1];
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if (do_no_trailing && c != '_') {
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do_no_trailing = FALSE;
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}
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if (!do_no_trailing) {
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ACPI_PATH_PUT8(full_path, path_size, c, length);
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}
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}
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next_node = next_node->parent;
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}
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ACPI_PATH_PUT8(full_path, path_size, AML_ROOT_PREFIX, length);
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/* Reverse the path string */
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if (length <= path_size) {
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left = full_path;
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right = full_path + length - 1;
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while (left < right) {
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c = *left;
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*left++ = *right;
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*right-- = c;
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}
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}
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/* Append the trailing null */
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build_trailing_null:
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ACPI_PATH_PUT8(full_path, path_size, '\0', length);
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#undef ACPI_PATH_PUT8
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return_UINT32(length);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_get_normalized_pathname
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*
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* PARAMETERS: node - Namespace node whose pathname is needed
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* no_trailing - Remove trailing '_' from each name segment
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*
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* RETURN: Pointer to storage containing the fully qualified name of
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* the node, In external format (name segments separated by path
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* separators.)
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*
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* DESCRIPTION: Used to obtain the full pathname to a namespace node, usually
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* for error and debug statements. All trailing '_' will be
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* removed from the full pathname if 'NoTrailing' is specified..
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*
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******************************************************************************/
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char *acpi_ns_get_normalized_pathname(struct acpi_namespace_node *node,
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u8 no_trailing)
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{
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char *name_buffer;
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acpi_size size;
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ACPI_FUNCTION_TRACE_PTR(ns_get_normalized_pathname, node);
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/* Calculate required buffer size based on depth below root */
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size = acpi_ns_build_normalized_path(node, NULL, 0, no_trailing);
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if (!size) {
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return_PTR(NULL);
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}
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/* Allocate a buffer to be returned to caller */
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name_buffer = ACPI_ALLOCATE_ZEROED(size);
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if (!name_buffer) {
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ACPI_ERROR((AE_INFO, "Could not allocate %u bytes", (u32)size));
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return_PTR(NULL);
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}
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/* Build the path in the allocated buffer */
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(void)acpi_ns_build_normalized_path(node, name_buffer, size,
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no_trailing);
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return_PTR(name_buffer);
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}
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