nsutils.c

linux-2.6.15.6

/******************************************************************************
 *
 * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
 *                        parents and siblings and Scope manipulation
 *
 *****************************************************************************/

/*
 * 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/amlcode.h>
#include <acpi/actables.h>

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsutils")

/* Local prototypes */
static u8 acpi_ns_valid_path_separator(char sep);

#ifdef ACPI_OBSOLETE_FUNCTIONS
acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search);
#endif

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_report_error
 *
 * PARAMETERS:  module_name         - Caller's module name (for error output)
 *              line_number         - Caller's line number (for error output)
 *              component_id        - Caller's component ID (for error output)
 *              internal_name       - Name or path of the namespace node
 *              lookup_status       - Exception code from NS lookup
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print warning message with full pathname
 *
 ******************************************************************************/

void
acpi_ns_report_error(char *module_name,
		     u32 line_number,
		     u32 component_id,
		     char *internal_name, acpi_status lookup_status)
{
	acpi_status status;
	char *name = NULL;

	acpi_os_printf("%8s-%04d: *** Error: Looking up ",
		       module_name, line_number);

	if (lookup_status == AE_BAD_CHARACTER) {
		/* There is a non-ascii character in the name */

		acpi_os_printf("[0x%4.4X] (NON-ASCII)\n",
			       *(ACPI_CAST_PTR(u32, internal_name)));
	} else {
		/* Convert path to external format */

		status = acpi_ns_externalize_name(ACPI_UINT32_MAX,
						  internal_name, NULL, &name);

		/* Print target name */

		if (ACPI_SUCCESS(status)) {
			acpi_os_printf("[%s]", name);
		} else {
			acpi_os_printf("[COULD NOT EXTERNALIZE NAME]");
		}

		if (name) {
			ACPI_MEM_FREE(name);
		}
	}

	acpi_os_printf(" in namespace, %s\n",
		       acpi_format_exception(lookup_status));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_report_method_error
 *
 * PARAMETERS:  module_name         - Caller's module name (for error output)
 *              line_number         - Caller's line number (for error output)
 *              component_id        - Caller's component ID (for error output)
 *              Message             - Error message to use on failure
 *              prefix_node         - Prefix relative to the path
 *              Path                - Path to the node
 *              method_status       - Execution status
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print warning message with full pathname
 *
 ******************************************************************************/

void
acpi_ns_report_method_error(char *module_name,
			    u32 line_number,
			    u32 component_id,
			    char *message,
			    struct acpi_namespace_node *prefix_node,
			    char *path, acpi_status method_status)
{
	acpi_status status;
	struct acpi_namespace_node *node = prefix_node;

	if (path) {
		status = acpi_ns_get_node_by_path(path, prefix_node,
						  ACPI_NS_NO_UPSEARCH, &node);
		if (ACPI_FAILURE(status)) {
			acpi_os_printf
			    ("report_method_error: Could not get node\n");
			return;
		}
	}

	acpi_os_printf("%8s-%04d: *** Error: ", module_name, line_number);
	acpi_ns_print_node_pathname(node, message);
	acpi_os_printf(", %s\n", acpi_format_exception(method_status));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_print_node_pathname
 *
 * PARAMETERS:  Node            - Object
 *              Message         - Prefix message
 *
 * DESCRIPTION: Print an object's full namespace pathname
 *              Manages allocation/freeing of a pathname buffer
 *
 ******************************************************************************/

void
acpi_ns_print_node_pathname(struct acpi_namespace_node *node, char *message)
{
	struct acpi_buffer buffer;
	acpi_status status;

	if (!node) {
		acpi_os_printf("[NULL NAME]");
		return;
	}

	/* Convert handle to full pathname and print it (with supplied message) */

	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;

	status = acpi_ns_handle_to_pathname(node, &buffer);
	if (ACPI_SUCCESS(status)) {
		if (message) {
			acpi_os_printf("%s ", message);
		}

		acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
		ACPI_MEM_FREE(buffer.pointer);
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_valid_root_prefix
 *
 * PARAMETERS:  Prefix          - Character to be checked
 *
 * RETURN:      TRUE if a valid prefix
 *
 * DESCRIPTION: Check if a character is a valid ACPI Root prefix
 *
 ******************************************************************************/

u8 acpi_ns_valid_root_prefix(char prefix)
{

	return ((u8) (prefix == '\\'));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_valid_path_separator
 *
 * PARAMETERS:  Sep         - Character to be checked
 *
 * RETURN:      TRUE if a valid path separator
 *
 * DESCRIPTION: Check if a character is a valid ACPI path separator
 *
 ******************************************************************************/

static u8 acpi_ns_valid_path_separator(char sep)
{

	return ((u8) (sep == '.'));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_type
 *
 * PARAMETERS:  Node        - Parent Node to be examined
 *
 * RETURN:      Type field from Node whose handle is passed
 *
 * DESCRIPTION: Return the type of a Namespace node
 *
 ******************************************************************************/

acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
{
	ACPI_FUNCTION_TRACE("ns_get_type");

	if (!node) {
		ACPI_REPORT_WARNING(("ns_get_type: Null Node input pointer\n"));
		return_VALUE(ACPI_TYPE_ANY);
	}

	return_VALUE((acpi_object_type) node->type);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_local
 *
 * PARAMETERS:  Type        - A namespace object type
 *
 * RETURN:      LOCAL if names must be found locally in objects of the
 *              passed type, 0 if enclosing scopes should be searched
 *
 * DESCRIPTION: Returns scope rule for the given object type.
 *
 ******************************************************************************/

u32 acpi_ns_local(acpi_object_type type)
{
	ACPI_FUNCTION_TRACE("ns_local");

	if (!acpi_ut_valid_object_type(type)) {
		/* Type code out of range  */

		ACPI_REPORT_WARNING(("ns_local: Invalid Object Type\n"));
		return_VALUE(ACPI_NS_NORMAL);
	}

	return_VALUE((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_internal_name_length
 *
 * PARAMETERS:  Info            - Info struct initialized with the
 *                                external name pointer.
 *
 * RETURN:      None
 *
 * DESCRIPTION: Calculate the length of the internal (AML) namestring
 *              corresponding to the external (ASL) namestring.
 *
 ******************************************************************************/

void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
{
	char *next_external_char;
	u32 i;

	ACPI_FUNCTION_ENTRY();

	next_external_char = info->external_name;
	info->num_carats = 0;
	info->num_segments = 0;
	info->fully_qualified = FALSE;

	/*
	 * For the internal name, the required length is 4 bytes per segment, plus
	 * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
	 * (which is not really needed, but no there's harm in putting it there)
	 *
	 * strlen() + 1 covers the first name_seg, which has no path separator
	 */
	if (acpi_ns_valid_root_prefix(next_external_char[0])) {
		info->fully_qualified = TRUE;
		next_external_char++;
	} else {
		/*
		 * Handle Carat prefixes
		 */
		while (*next_external_char == '^') {
			info->num_carats++;
			next_external_char++;
		}
	}

	/*
	 * Determine the number of ACPI name "segments" by counting the number of
	 * path separators within the string. Start with one segment since the
	 * segment count is [(# separators) + 1], and zero separators is ok.
	 */
	if (*next_external_char) {
		info->num_segments = 1;
		for (i = 0; next_external_char[i]; i++) {
			if (acpi_ns_valid_path_separator(next_external_char[i])) {
				info->num_segments++;
			}
		}
	}

	info->length = (ACPI_NAME_SIZE * info->num_segments) +
	    4 + info->num_carats;

	info->next_external_char = next_external_char;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_build_internal_name
 *
 * PARAMETERS:  Info            - Info struct fully initialized
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Construct the internal (AML) namestring
 *              corresponding to the external (ASL) namestring.
 *
 ******************************************************************************/

acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
{
	u32 num_segments = info->num_segments;
	char *internal_name = info->internal_name;
	char *external_name = info->next_external_char;
	char *result = NULL;
	acpi_native_uint i;

	ACPI_FUNCTION_TRACE("ns_build_internal_name");

	/* Setup the correct prefixes, counts, and pointers */

	if (info->fully_qualified) {
		internal_name[0] = '\\';

		if (num_segments <= 1) {
			result = &internal_name[1];
		} else if (num_segments == 2) {
			internal_name[1] = AML_DUAL_NAME_PREFIX;
			result = &internal_name[2];
		} else {
			internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
			internal_name[2] = (char)num_segments;
			result = &internal_name[3];
		}
	} else {
		/*
		 * Not fully qualified.
		 * Handle Carats first, then append the name segments
		 */
		i = 0;
		if (info->num_carats) {
			for (i = 0; i < info->num_carats; i++) {
				internal_name[i] = '^';
			}
		}

		if (num_segments <= 1) {
			result = &internal_name[i];
		} else if (num_segments == 2) {
			internal_name[i] = AML_DUAL_NAME_PREFIX;
			result = &internal_name[(acpi_native_uint) (i + 1)];
		} else {
			internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
			internal_name[(acpi_native_uint) (i + 1)] =
			    (char)num_segments;
			result = &internal_name[(acpi_native_uint) (i + 2)];
		}
	}

	/* Build the name (minus path separators) */

	for (; num_segments; num_segments--) {
		for (i = 0; i < ACPI_NAME_SIZE; i++) {
			if (acpi_ns_valid_path_separator(*external_name) ||
			    (*external_name == 0)) {
				/* Pad the segment with underscore(s) if segment is short */

				result[i] = '_';
			} else {
				/* Convert the character to uppercase and save it */

				result[i] =
				    (char)ACPI_TOUPPER((int)*external_name);
				external_name++;
			}
		}

		/* Now we must have a path separator, or the pathname is bad */

		if (!acpi_ns_valid_path_separator(*external_name) &&
		    (*external_name != 0)) {
			return_ACPI_STATUS(AE_BAD_PARAMETER);
		}

		/* Move on the next segment */

		external_name++;
		result += ACPI_NAME_SIZE;
	}

	/* Terminate the string */

	*result = 0;

	if (info->fully_qualified) {
		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "Returning [%p] (abs) \"\\%s\"\n",
				  internal_name, internal_name));
	} else {
		ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
				  internal_name, internal_name));
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_internalize_name
 *
 * PARAMETERS:  *external_name          - External representation of name
 *              **Converted Name        - Where to return the resulting
 *                                        internal represention of the name
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
 *              to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 *
 *******************************************************************************/

acpi_status acpi_ns_internalize_name(char *external_name, char **converted_name)
{
	char *internal_name;
	struct acpi_namestring_info info;
	acpi_status status;

	ACPI_FUNCTION_TRACE("ns_internalize_name");

	if ((!external_name) || (*external_name == 0) || (!converted_name)) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Get the length of the new internal name */

	info.external_name = external_name;
	acpi_ns_get_internal_name_length(&info);

	/* We need a segment to store the internal  name */

	internal_name = ACPI_MEM_CALLOCATE(info.length);
	if (!internal_name) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Build the name */