nsutils.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:23k
- /******************************************************************************
- *
- * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
- * parents and siblings and Scope manipulation
- * $Revision: 92 $
- *
- *****************************************************************************/
- /*
- * Copyright (C) 2000, 2001 R. Byron Moore
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "acpi.h"
- #include "acnamesp.h"
- #include "acinterp.h"
- #include "amlcode.h"
- #include "actables.h"
- #define _COMPONENT ACPI_NAMESPACE
- MODULE_NAME ("nsutils")
- /*******************************************************************************
- *
- * 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 (
- NATIVE_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
- *
- ******************************************************************************/
- u8
- acpi_ns_valid_path_separator (
- NATIVE_CHAR sep)
- {
- return ((u8) (sep == '.'));
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_get_type
- *
- * PARAMETERS: Handle - Parent Node to be examined
- *
- * RETURN: Type field from Node whose handle is passed
- *
- ******************************************************************************/
- acpi_object_type8
- acpi_ns_get_type (
- acpi_namespace_node *node)
- {
- FUNCTION_TRACE ("Ns_get_type");
- if (!node) {
- REPORT_WARNING (("Ns_get_type: Null Node ptr"));
- return_VALUE (ACPI_TYPE_ANY);
- }
- return_VALUE (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
- *
- ******************************************************************************/
- u32
- acpi_ns_local (
- acpi_object_type8 type)
- {
- FUNCTION_TRACE ("Ns_local");
- if (!acpi_ut_valid_object_type (type)) {
- /* Type code out of range */
- REPORT_WARNING (("Ns_local: Invalid Object Typen"));
- return_VALUE (NSP_NORMAL);
- }
- return_VALUE ((u32) acpi_gbl_ns_properties[type] & NSP_LOCAL);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_get_internal_name_length
- *
- * PARAMETERS: Info - Info struct initialized with the
- * external name pointer.
- *
- * RETURN: Status
- *
- * DESCRIPTION: Calculate the length of the internal (AML) namestring
- * corresponding to the external (ASL) namestring.
- *
- ******************************************************************************/
- acpi_status
- acpi_ns_get_internal_name_length (
- acpi_namestring_info *info)
- {
- NATIVE_CHAR *next_external_char;
- u32 i;
- 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;
- return (AE_OK);
- }
- /*******************************************************************************
- *
- * 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 (
- acpi_namestring_info *info)
- {
- u32 num_segments = info->num_segments;
- NATIVE_CHAR *internal_name = info->internal_name;
- NATIVE_CHAR *external_name = info->next_external_char;
- NATIVE_CHAR *result = NULL;
- u32 i;
- 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[i+1];
- }
- else {
- internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
- internal_name[i+1] = (char) num_segments;
- result = &internal_name[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) TOUPPER (*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[0]));
- }
- else {
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "returning [%p] (rel) "%s"n",
- internal_name, &internal_name[2]));
- }
- 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 (
- NATIVE_CHAR *external_name,
- NATIVE_CHAR **converted_name)
- {
- NATIVE_CHAR *internal_name;
- acpi_namestring_info info;
- acpi_status status;
- 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 */
- info.internal_name = internal_name;
- status = acpi_ns_build_internal_name (&info);
- if (ACPI_FAILURE (status)) {
- ACPI_MEM_FREE (internal_name);
- return_ACPI_STATUS (status);
- }
- *converted_name = internal_name;
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_externalize_name
- *
- * PARAMETERS: *Internal_name - Internal representation of name
- * **Converted_name - Where to return the resulting
- * external representation of name
- *
- * RETURN: Status
- *
- * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
- * to its external form (e.g. "_PR_.CPU0")
- *
- ******************************************************************************/
- acpi_status
- acpi_ns_externalize_name (
- u32 internal_name_length,
- char *internal_name,
- u32 *converted_name_length,
- char **converted_name)
- {
- u32 prefix_length = 0;
- u32 names_index = 0;
- u32 names_count = 0;
- u32 i = 0;
- u32 j = 0;
- FUNCTION_TRACE ("Ns_externalize_name");
- if (!internal_name_length ||
- !internal_name ||
- !converted_name_length ||
- !converted_name) {
- return_ACPI_STATUS (AE_BAD_PARAMETER);
- }
- /*
- * Check for a prefix (one '' | one or more '^').
- */
- switch (internal_name[0]) {
- case '\':
- prefix_length = 1;
- break;
- case '^':
- for (i = 0; i < internal_name_length; i++) {
- if (internal_name[i] != '^') {
- prefix_length = i + 1;
- }
- }
- if (i == internal_name_length) {
- prefix_length = i;
- }
- break;
- }
- /*
- * Check for object names. Note that there could be 0-255 of these
- * 4-byte elements.
- */
- if (prefix_length < internal_name_length) {
- switch (internal_name[prefix_length]) {
- /* <count> 4-byte names */
- case AML_MULTI_NAME_PREFIX_OP:
- names_index = prefix_length + 2;
- names_count = (u32) internal_name[prefix_length + 1];
- break;
- /* two 4-byte names */
- case AML_DUAL_NAME_PREFIX:
- names_index = prefix_length + 1;
- names_count = 2;
- break;
- /* Null_name */
- case 0:
- names_index = 0;
- names_count = 0;
- break;
- /* one 4-byte name */
- default:
- names_index = prefix_length;
- names_count = 1;
- break;
- }
- }
- /*
- * Calculate the length of Converted_name, which equals the length
- * of the prefix, length of all object names, length of any required
- * punctuation ('.') between object names, plus the NULL terminator.
- */
- *converted_name_length = prefix_length + (4 * names_count) +
- ((names_count > 0) ? (names_count - 1) : 0) + 1;
- /*
- * Check to see if we're still in bounds. If not, there's a problem
- * with Internal_name (invalid format).
- */
- if (*converted_name_length > internal_name_length) {
- REPORT_ERROR (("Ns_externalize_name: Invalid internal namen"));
- return_ACPI_STATUS (AE_BAD_PATHNAME);
- }
- /*
- * Build Converted_name...
- */
- (*converted_name) = ACPI_MEM_CALLOCATE (*converted_name_length);
- if (!(*converted_name)) {
- return_ACPI_STATUS (AE_NO_MEMORY);
- }
- j = 0;
- for (i = 0; i < prefix_length; i++) {
- (*converted_name)[j++] = internal_name[i];
- }
- if (names_count > 0) {
- for (i = 0; i < names_count; i++) {
- if (i > 0) {
- (*converted_name)[j++] = '.';
- }
- (*converted_name)[j++] = internal_name[names_index++];
- (*converted_name)[j++] = internal_name[names_index++];
- (*converted_name)[j++] = internal_name[names_index++];
- (*converted_name)[j++] = internal_name[names_index++];
- }
- }
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_map_handle_to_node
- *
- * PARAMETERS: Handle - Handle to be converted to an Node
- *
- * RETURN: A Name table entry pointer
- *
- * DESCRIPTION: Convert a namespace handle to a real Node
- *
- ******************************************************************************/
- acpi_namespace_node *
- acpi_ns_map_handle_to_node (
- acpi_handle handle)
- {
- FUNCTION_ENTRY ();
- /*
- * Simple implementation for now;
- * TBD: [Future] Real integer handles allow for more verification
- * and keep all pointers within this subsystem!
- */
- if (!handle) {
- return (NULL);
- }
- if (handle == ACPI_ROOT_OBJECT) {
- return (acpi_gbl_root_node);
- }
- /* We can at least attempt to verify the handle */
- if (!VALID_DESCRIPTOR_TYPE (handle, ACPI_DESC_TYPE_NAMED)) {
- return (NULL);
- }
- return ((acpi_namespace_node *) handle);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_convert_entry_to_handle
- *
- * PARAMETERS: Node - Node to be converted to a Handle
- *
- * RETURN: An USER acpi_handle
- *
- * DESCRIPTION: Convert a real Node to a namespace handle
- *
- ******************************************************************************/
- acpi_handle
- acpi_ns_convert_entry_to_handle (
- acpi_namespace_node *node)
- {
- /*
- * Simple implementation for now;
- * TBD: [Future] Real integer handles allow for more verification
- * and keep all pointers within this subsystem!
- */
- return ((acpi_handle) node);
- /* ---------------------------------------------------
- if (!Node)
- {
- return (NULL);
- }
- if (Node == Acpi_gbl_Root_node)
- {
- return (ACPI_ROOT_OBJECT);
- }
- return ((acpi_handle) Node);
- ------------------------------------------------------*/
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_terminate
- *
- * PARAMETERS: none
- *
- * RETURN: none
- *
- * DESCRIPTION: free memory allocated for table storage.
- *
- ******************************************************************************/
- void
- acpi_ns_terminate (void)
- {
- acpi_operand_object *obj_desc;
- acpi_namespace_node *this_node;
- FUNCTION_TRACE ("Ns_terminate");
- this_node = acpi_gbl_root_node;
- /*
- * 1) Free the entire namespace -- all objects, tables, and stacks
- *
- * Delete all objects linked to the root
- * (additional table descriptors)
- */
- acpi_ns_delete_namespace_subtree (this_node);
- /* Detach any object(s) attached to the root */
- obj_desc = acpi_ns_get_attached_object (this_node);
- if (obj_desc) {
- acpi_ns_detach_object (this_node);
- acpi_ut_remove_reference (obj_desc);
- }
- acpi_ns_delete_children (this_node);
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace freedn"));
- /*
- * 2) Now we can delete the ACPI tables
- */
- acpi_tb_delete_acpi_tables ();
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "ACPI Tables freedn"));
- return_VOID;
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_opens_scope
- *
- * PARAMETERS: Type - A valid namespace type
- *
- * RETURN: NEWSCOPE if the passed type "opens a name scope" according
- * to the ACPI specification, else 0
- *
- ******************************************************************************/
- u32
- acpi_ns_opens_scope (
- acpi_object_type8 type)
- {
- FUNCTION_TRACE_U32 ("Ns_opens_scope", type);
- if (!acpi_ut_valid_object_type (type)) {
- /* type code out of range */
- REPORT_WARNING (("Ns_opens_scope: Invalid Object Typen"));
- return_VALUE (NSP_NORMAL);
- }
- return_VALUE (((u32) acpi_gbl_ns_properties[type]) & NSP_NEWSCOPE);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_get_node
- *
- * PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The
- * (backslash) and ^ (carat) prefixes, and the
- * . (period) to separate segments are supported.
- * Start_node - Root of subtree to be searched, or NS_ALL for the
- * root of the name space. If Name is fully
- * qualified (first s8 is ''), the passed value
- * of Scope will not be accessed.
- * Return_node - Where the Node is returned
- *
- * DESCRIPTION: Look up a name relative to a given scope and return the
- * corresponding Node. NOTE: Scope can be null.
- *
- * MUTEX: Locks namespace
- *
- ******************************************************************************/
- acpi_status
- acpi_ns_get_node (
- NATIVE_CHAR *pathname,
- acpi_namespace_node *start_node,
- acpi_namespace_node **return_node)
- {
- acpi_generic_state scope_info;
- acpi_status status;
- NATIVE_CHAR *internal_path = NULL;
- FUNCTION_TRACE_PTR ("Ns_get_node", pathname);
- /* Ensure that the namespace has been initialized */
- if (!acpi_gbl_root_node) {
- return_ACPI_STATUS (AE_NO_NAMESPACE);
- }
- if (!pathname) {
- return_ACPI_STATUS (AE_BAD_PARAMETER);
- }
- /* Convert path to internal representation */
- status = acpi_ns_internalize_name (pathname, &internal_path);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
- /* Setup lookup scope (search starting point) */
- scope_info.scope.node = start_node;
- /* Lookup the name in the namespace */
- status = acpi_ns_lookup (&scope_info, internal_path,
- ACPI_TYPE_ANY, IMODE_EXECUTE,
- NS_NO_UPSEARCH | NS_DONT_OPEN_SCOPE,
- NULL, return_node);
- if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "%s, %sn",
- internal_path, acpi_format_exception (status)));
- }
- acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
- /* Cleanup */
- ACPI_MEM_FREE (internal_path);
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_find_parent_name
- *
- * PARAMETERS: *Child_node - Named Obj whose name is to be found
- *
- * RETURN: The ACPI name
- *
- * DESCRIPTION: Search for the given obj in its parent scope and return the
- * name segment, or "????" if the parent name can't be found
- * (which "should not happen").
- *
- ******************************************************************************/
- acpi_name
- acpi_ns_find_parent_name (
- acpi_namespace_node *child_node)
- {
- acpi_namespace_node *parent_node;
- FUNCTION_TRACE ("Ns_find_parent_name");
- if (child_node) {
- /* Valid entry. Get the parent Node */
- parent_node = acpi_ns_get_parent_object (child_node);
- if (parent_node) {
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Parent of %p [%4.4s] is %p [%4.4s]n",
- child_node, (char*)&child_node->name, parent_node, (char*)&parent_node->name));
- if (parent_node->name) {
- return_VALUE (parent_node->name);
- }
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "unable to find parent of %p (%4.4s)n",
- child_node, (char*)&child_node->name));
- }
- return_VALUE (ACPI_UNKNOWN_NAME);
- }
- #if defined(ACPI_DEBUG) || defined(ENABLE_DEBUGGER)
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_exist_downstream_sibling
- *
- * PARAMETERS: *Node - pointer to first Node to examine
- *
- * RETURN: TRUE if sibling is found, FALSE otherwise
- *
- * DESCRIPTION: Searches remainder of scope being processed to determine
- * whether there is a downstream sibling to the current
- * object. This function is used to determine what type of
- * line drawing character to use when displaying namespace
- * trees.
- *
- ******************************************************************************/
- u8
- acpi_ns_exist_downstream_sibling (
- acpi_namespace_node *node)
- {
- if (!node) {
- return (FALSE);
- }
- if (node->name) {
- return (TRUE);
- }
- return (FALSE);
- }
- #endif /* ACPI_DEBUG */
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_get_parent_object
- *
- * PARAMETERS: Node - Current table entry
- *
- * RETURN: Parent entry of the given entry
- *
- * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
- *
- ******************************************************************************/
- acpi_namespace_node *
- acpi_ns_get_parent_object (
- acpi_namespace_node *node)
- {
- FUNCTION_ENTRY ();
- if (!node) {
- return (NULL);
- }
- /*
- * Walk to the end of this peer list.
- * The last entry is marked with a flag and the peer
- * pointer is really a pointer back to the parent.
- * This saves putting a parent back pointer in each and
- * every named object!
- */
- while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
- node = node->peer;
- }
- return (node->peer);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ns_get_next_valid_node
- *
- * PARAMETERS: Node - Current table entry
- *
- * RETURN: Next valid Node in the linked node list. NULL if no more valid
- * nodess
- *
- * DESCRIPTION: Find the next valid node within a name table.
- * Useful for implementing NULL-end-of-list loops.
- *
- ******************************************************************************/
- acpi_namespace_node *
- acpi_ns_get_next_valid_node (
- acpi_namespace_node *node)
- {
- /* If we are at the end of this peer list, return NULL */
- if (node->flags & ANOBJ_END_OF_PEER_LIST) {
- return NULL;
- }
- /* Otherwise just return the next peer */
- return (node->peer);
- }