📄 nsaccess.c
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/*******************************************************************************
*
* Module Name: nsaccess - Top-level functions for accessing ACPI namespace
* $Revision: 1.1 $
*
******************************************************************************/
/*
* 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>
#define _COMPONENT ACPI_NAMESPACE
MODULE_NAME ("nsaccess")
/*******************************************************************************
*
* FUNCTION: Acpi_ns_root_initialize
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Allocate and initialize the default root named objects
*
* MUTEX: Locks namespace for entire execution
*
******************************************************************************/
ACPI_STATUS
acpi_ns_root_initialize (void)
{
ACPI_STATUS status = AE_OK;
PREDEFINED_NAMES *init_val = NULL;
ACPI_NAMESPACE_NODE *new_node;
ACPI_OPERAND_OBJECT *obj_desc;
acpi_cm_acquire_mutex (ACPI_MTX_NAMESPACE);
/*
* The global root ptr is initially NULL, so a non-NULL value indicates
* that Acpi_ns_root_initialize() has already been called; just return.
*/
if (acpi_gbl_root_node) {
status = AE_OK;
goto unlock_and_exit;
}
/*
* Tell the rest of the subsystem that the root is initialized
* (This is OK because the namespace is locked)
*/
acpi_gbl_root_node = &acpi_gbl_root_node_struct;
/* Enter the pre-defined names in the name table */
for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) {
status = acpi_ns_lookup (NULL, init_val->name,
(OBJECT_TYPE_INTERNAL) init_val->type,
IMODE_LOAD_PASS2, NS_NO_UPSEARCH,
NULL, &new_node);
/*
* Name entered successfully.
* If entry in Pre_defined_names[] specifies an
* initial value, create the initial value.
*/
if (init_val->val) {
/*
* Entry requests an initial value, allocate a
* descriptor for it.
*/
obj_desc = acpi_cm_create_internal_object (
(OBJECT_TYPE_INTERNAL) init_val->type);
if (!obj_desc) {
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
/*
* Convert value string from table entry to
* internal representation. Only types actually
* used for initial values are implemented here.
*/
switch (init_val->type) {
case ACPI_TYPE_INTEGER:
obj_desc->integer.value =
(ACPI_INTEGER) STRTOUL (init_val->val, NULL, 10);
break;
case ACPI_TYPE_STRING:
obj_desc->string.length = STRLEN (init_val->val);
/*
* Allocate a buffer for the string. All
* String.Pointers must be allocated buffers!
* (makes deletion simpler)
*/
obj_desc->string.pointer = acpi_cm_allocate (
(obj_desc->string.length + 1));
if (!obj_desc->string.pointer) {
acpi_cm_remove_reference (obj_desc);
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
STRCPY (obj_desc->string.pointer, init_val->val);
break;
case ACPI_TYPE_MUTEX:
obj_desc->mutex.sync_level =
(u16) STRTOUL (init_val->val, NULL, 10);
if (STRCMP (init_val->name, "_GL_") == 0) {
/*
* Create a counting semaphore for the
* global lock
*/
status = acpi_os_create_semaphore (ACPI_NO_UNIT_LIMIT,
1, &obj_desc->mutex.semaphore);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
/*
* We just created the mutex for the
* global lock, save it
*/
acpi_gbl_global_lock_semaphore = obj_desc->mutex.semaphore;
}
else {
/* Create a mutex */
status = acpi_os_create_semaphore (1, 1,
&obj_desc->mutex.semaphore);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
}
break;
default:
REPORT_ERROR (("Unsupported initial type value %X\n",
init_val->type));
acpi_cm_remove_reference (obj_desc);
obj_desc = NULL;
continue;
}
/* Store pointer to value descriptor in the Node */
acpi_ns_attach_object (new_node, obj_desc, obj_desc->common.type);
}
}
unlock_and_exit:
acpi_cm_release_mutex (ACPI_MTX_NAMESPACE);
return (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ns_lookup
*
* PARAMETERS: Prefix_node - Search scope if name is not fully qualified
* Pathname - Search pathname, in internal format
* (as represented in the AML stream)
* Type - Type associated with name
* Interpreter_mode - IMODE_LOAD_PASS2 => add name if not found
* Flags - Flags describing the search restrictions
* Walk_state - Current state of the walk
* Return_node - Where the Node is placed (if found
* or created successfully)
*
* RETURN: Status
*
* DESCRIPTION: Find or enter the passed name in the name space.
* Log an error if name not found in Exec mode.
*
* MUTEX: Assumes namespace is locked.
*
******************************************************************************/
ACPI_STATUS
acpi_ns_lookup (
ACPI_GENERIC_STATE *scope_info,
NATIVE_CHAR *pathname,
OBJECT_TYPE_INTERNAL type,
OPERATING_MODE interpreter_mode,
u32 flags,
ACPI_WALK_STATE *walk_state,
ACPI_NAMESPACE_NODE **return_node)
{
ACPI_STATUS status;
ACPI_NAMESPACE_NODE *prefix_node;
ACPI_NAMESPACE_NODE *current_node = NULL;
ACPI_NAMESPACE_NODE *scope_to_push = NULL;
ACPI_NAMESPACE_NODE *this_node = NULL;
u32 num_segments;
ACPI_NAME simple_name;
u8 null_name_path = FALSE;
OBJECT_TYPE_INTERNAL type_to_check_for;
OBJECT_TYPE_INTERNAL this_search_type;
u32 local_flags = flags & ~NS_ERROR_IF_FOUND;
if (!return_node) {
return (AE_BAD_PARAMETER);
}
acpi_gbl_ns_lookup_count++;
*return_node = ENTRY_NOT_FOUND;
if (!acpi_gbl_root_node) {
return (AE_NO_NAMESPACE);
}
/*
* Get the prefix scope.
* A null scope means use the root scope
*/
if ((!scope_info) ||
(!scope_info->scope.node)) {
prefix_node = acpi_gbl_root_node;
}
else {
prefix_node = scope_info->scope.node;
}
/*
* This check is explicitly split provide relax the Type_to_check_for
* conditions for Bank_field_defn. Originally, both Bank_field_defn and
* Def_field_defn caused Type_to_check_for to be set to ACPI_TYPE_REGION,
* but the Bank_field_defn may also check for a Field definition as well
* as an Operation_region.
*/
if (INTERNAL_TYPE_DEF_FIELD_DEFN == type) {
/* Def_field_defn defines fields in a Region */
type_to_check_for = ACPI_TYPE_REGION;
}
else if (INTERNAL_TYPE_BANK_FIELD_DEFN == type) {
/* Bank_field_defn defines data fields in a Field Object */
type_to_check_for = ACPI_TYPE_ANY;
}
else {
type_to_check_for = type;
}
/* TBD: [Restructure] - Move the pathname stuff into a new procedure */
/* Examine the name pointer */
if (!pathname) {
/* 8-12-98 ASL Grammar Update supports null Name_path */
null_name_path = TRUE;
num_segments = 0;
this_node = acpi_gbl_root_node;
}
else {
/*
* Valid name pointer (Internal name format)
*
* Check for prefixes. As represented in the AML stream, a
* Pathname consists of an optional scope prefix followed by
* a segment part.
*
* If present, the scope prefix is either a Root_prefix (in
* which case the name is fully qualified), or zero or more
* Parent_prefixes (in which case the name's scope is relative
* to the current scope).
*
* The segment part consists of either:
* - A single 4-byte name segment, or
* - A Dual_name_prefix followed by two 4-byte name segments, or
* - A Multi_name_prefix_op, followed by a byte indicating the
* number of segments and the segments themselves.
*/
if (*pathname == AML_ROOT_PREFIX) {
/* Pathname is fully qualified, look in root name table */
current_node = acpi_gbl_root_node;
/* point to segment part */
pathname++;
/* Direct reference to root, "\" */
if (!(*pathname)) {
this_node = acpi_gbl_root_node;
goto check_for_new_scope_and_exit;
}
}
else {
/* Pathname is relative to current scope, start there */
current_node = prefix_node;
/*
* Handle up-prefix (carat). More than one prefix
* is supported
*/
while (*pathname == AML_PARENT_PREFIX) {
/* Point to segment part or next Parent_prefix */
pathname++;
/* Backup to the parent's scope */
this_node = acpi_ns_get_parent_object (current_node);
if (!this_node) {
/* Current scope has no parent scope */
REPORT_ERROR (
("Too many parent prefixes (^) - reached root\n"));
return (AE_NOT_FOUND);
}
current_node = this_node;
}
}
/*
* Examine the name prefix opcode, if any,
* to determine the number of segments
*/
if (*pathname == AML_DUAL_NAME_PREFIX) {
num_segments = 2;
/* point to first segment */
pathname++;
}
else if (*pathname == AML_MULTI_NAME_PREFIX_OP) {
num_segments = (u32)* (u8 *) ++pathname;
/* point to first segment */
pathname++;
}
else {
/*
* No Dual or Multi prefix, hence there is only one
* segment and Pathname is already pointing to it.
*/
num_segments = 1;
}
}
/*
* Search namespace for each segment of the name.
* Loop through and verify/add each name segment.
*/
while (num_segments-- && current_node) {
/*
* Search for the current name segment under the current
* named object. The Type is significant only at the last (topmost)
* level. (We don't care about the types along the path, only
* the type of the final target object.)
*/
this_search_type = ACPI_TYPE_ANY;
if (!num_segments) {
this_search_type = type;
local_flags = flags;
}
/* Pluck one ACPI name from the front of the pathname */
MOVE_UNALIGNED32_TO_32 (&simple_name, pathname);
/* Try to find the ACPI name */
status = acpi_ns_search_and_enter (simple_name, walk_state,
current_node, interpreter_mode,
this_search_type, local_flags,
&this_node);
if (ACPI_FAILURE (status)) {
if (status == AE_NOT_FOUND) {
/* Name not found in ACPI namespace */
}
return (status);
}
/*
* If 1) This is the last segment (Num_segments == 0)
* 2) and looking for a specific type
* (Not checking for TYPE_ANY)
* 3) Which is not an alias
* 4) which is not a local type (TYPE_DEF_ANY)
* 5) which is not a local type (TYPE_SCOPE)
* 6) which is not a local type (TYPE_INDEX_FIELD_DEFN)
* 7) and type of object is known (not TYPE_ANY)
* 8) and object does not match request
*
* Then we have a type mismatch. Just warn and ignore it.
*/
if ((num_segments == 0) &&
(type_to_check_for != ACPI_TYPE_ANY) &&
(type_to_check_for != INTERNAL_TYPE_ALIAS) &&
(type_to_check_for != INTERNAL_TYPE_DEF_ANY) &&
(type_to_check_for != INTERNAL_TYPE_SCOPE) &&
(type_to_check_for != INTERNAL_TYPE_INDEX_FIELD_DEFN) &&
(this_node->type != ACPI_TYPE_ANY) &&
(this_node->type != type_to_check_for)) {
/* Complain about a type mismatch */
REPORT_WARNING (
("Ns_lookup: %4.4s, type %X, checking for type %X\n",
&simple_name, this_node->type, type_to_check_for));
}
/*
* If this is the last name segment and we are not looking for a
* specific type, but the type of found object is known, use that type
* to see if it opens a scope.
*/
if ((0 == num_segments) && (ACPI_TYPE_ANY == type)) {
type = this_node->type;
}
if ((num_segments || acpi_ns_opens_scope (type)) &&
(this_node->child == NULL)) {
/*
* More segments or the type implies enclosed scope,
* and the next scope has not been allocated.
*/
}
current_node = this_node;
/* point to next name segment */
pathname += ACPI_NAME_SIZE;
}
/*
* Always check if we need to open a new scope
*/
check_for_new_scope_and_exit:
if (!(flags & NS_DONT_OPEN_SCOPE) && (walk_state)) {
/*
* If entry is a type which opens a scope,
* push the new scope on the scope stack.
*/
if (acpi_ns_opens_scope (type_to_check_for)) {
/* 8-12-98 ASL Grammar Update supports null Name_path */
if (null_name_path) {
/* TBD: [Investigate] - is this the correct thing to do? */
scope_to_push = NULL;
}
else {
scope_to_push = this_node;
}
status = acpi_ds_scope_stack_push (scope_to_push, type,
walk_state);
if (ACPI_FAILURE (status)) {
return (status);
}
}
}
*return_node = this_node;
return (AE_OK);
}
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