nsaccess.c revision aa2aa9a662539940ddbc8610da5a3a874ebd7503
/*******************************************************************************
*
* Module Name: nsaccess - Top-level functions for accessing ACPI namespace
*
******************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#define __NSACCESS_C__
#include "acpi.h"
#include "accommon.h"
#include "amlcode.h"
#include "acnamesp.h"
#include "acdispat.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME ("nsaccess")
/*******************************************************************************
*
* FUNCTION: AcpiNsRootInitialize
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Allocate and initialize the default root named objects
*
* MUTEX: Locks namespace for entire execution
*
******************************************************************************/
void)
{
if (ACPI_FAILURE (Status))
{
}
/*
* The global root ptr is initially NULL, so a non-NULL value indicates
* that AcpiNsRootInitialize() has already been called; just return.
*/
if (AcpiGbl_RootNode)
{
goto UnlockAndExit;
}
/*
* Tell the rest of the subsystem that the root is initialized
* (This is OK because the namespace is locked)
*/
/* Enter the pre-defined names in the name table */
"Entering predefined entries into namespace\n"));
{
/* _OSI is optional for now, will be permanent later */
{
continue;
}
{
"Could not create predefined name %s",
}
/*
* Name entered successfully. If entry in PreDefinedNames[] specifies
* an initial value, create the initial value.
*/
{
if (ACPI_FAILURE (Status))
{
"Could not override predefined %s",
}
if (!Val)
{
}
/*
* Entry requests an initial value, allocate a
* descriptor for it.
*/
if (!ObjDesc)
{
goto UnlockAndExit;
}
/*
* Convert value string from table entry to
* internal representation. Only types actually
* used for initial values are implemented here.
*/
{
case ACPI_TYPE_METHOD:
#if defined (ACPI_ASL_COMPILER)
/* Save the parameter count for the iASL compiler */
#else
/* Mark this as a very SPECIAL method */
#endif
break;
case ACPI_TYPE_INTEGER:
break;
case ACPI_TYPE_STRING:
/* Build an object around the static string */
break;
case ACPI_TYPE_MUTEX:
/* Create a mutex */
if (ACPI_FAILURE (Status))
{
goto UnlockAndExit;
}
/* Special case for ACPI Global Lock */
{
/* Create additional counting semaphore for global lock */
1, 0, &AcpiGbl_GlobalLockSemaphore);
if (ACPI_FAILURE (Status))
{
goto UnlockAndExit;
}
}
break;
default:
continue;
}
/* Store pointer to value descriptor in the Node */
/* Remove local reference to the object */
}
}
(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
/* Save a handle to "_GPE", it is always present */
if (ACPI_SUCCESS (Status))
{
}
}
/*******************************************************************************
*
* FUNCTION: AcpiNsLookup
*
* PARAMETERS: ScopeInfo - Current scope info block
* Pathname - Search pathname, in internal format
* (as represented in the AML stream)
* Type - Type associated with name
* InterpreterMode - IMODE_LOAD_PASS2 => add name if not found
* Flags - Flags describing the search restrictions
* WalkState - Current state of the walk
* ReturnNode - 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.
*
******************************************************************************/
char *Pathname,
{
if (!ReturnNode)
{
}
if (!AcpiGbl_RootNode)
{
}
/* Get the prefix scope. A null scope means use the root scope */
if ((!ScopeInfo) ||
{
"Null scope prefix, using root node (%p)\n",
}
else
{
{
}
if (!(Flags & ACPI_NS_PREFIX_IS_SCOPE))
{
/*
* This node might not be a actual "scope" node (such as a
* node. Backup up the tree to find the containing scope node.
*/
{
}
}
}
/* Save type. TBD: may be no longer necessary */
/*
* Begin examination of the actual pathname
*/
if (!Pathname)
{
/* A Null NamePath is allowed and refers to the root */
NumSegments = 0;
Path = "";
"Null Pathname (Zero segments), Flags=%X\n", Flags));
}
else
{
/*
* Name pointer is valid (and must be in internal name format)
*
* Check for scope prefixes:
*
* As represented in the AML stream, a namepath consists of an
* optional scope prefix followed by a name segment part.
*
* If present, the scope prefix is either a Root Prefix (in
* which case the name is fully qualified), or one or more
* Parent Prefixes (in which case the name's scope is relative
* to the current scope).
*/
{
/* Pathname is fully qualified, start from the root */
/* Point to name segment part */
Path++;
"Path is absolute from root [%p]\n", ThisNode));
}
else
{
/* Pathname is relative to current scope, start there */
"Searching relative to prefix scope [%4.4s] (%p)\n",
/*
* Handle multiple Parent Prefixes (carat) by just getting
* the parent node for each prefix instance.
*/
NumCarats = 0;
{
/* Name is fully qualified, no search rules apply */
/*
* Point past this prefix to the name segment
* part or the next Parent Prefix
*/
Path++;
/* Backup to the parent node */
NumCarats++;
if (!ThisNode)
{
/* Current scope has no parent scope */
"ACPI path has too many parent prefixes (^) "
"- reached beyond root node"));
}
}
if (SearchParentFlag == ACPI_NS_NO_UPSEARCH)
{
"Search scope is [%4.4s], path has %d carat(s)\n",
}
}
/*
* Determine the number of ACPI name segments in this pathname.
*
* The segment part consists of either:
* - A Null name segment (0)
* - A DualNamePrefix followed by two 4-byte name segments
* - A MultiNamePrefix followed by a byte indicating the
* number of segments and the segments themselves.
* - A single 4-byte name segment
*
* Examine the name prefix opcode, if any, to determine the number of
* segments.
*/
switch (*Path)
{
case 0:
/*
* Null name after a root or parent prefixes. We already
* have the correct target node and there are no name segments.
*/
NumSegments = 0;
"Prefix-only Pathname (Zero name segments), Flags=%X\n",
Flags));
break;
case AML_DUAL_NAME_PREFIX:
/* More than one NameSeg, search rules do not apply */
/* Two segments, point to first name segment */
NumSegments = 2;
Path++;
"Dual Pathname (2 segments, Flags=%X)\n", Flags));
break;
case AML_MULTI_NAME_PREFIX_OP:
/* More than one NameSeg, search rules do not apply */
/* Extract segment count, point to first name segment */
Path++;
Path++;
"Multi Pathname (%d Segments, Flags=%X)\n",
NumSegments, Flags));
break;
default:
/*
* Not a Null name, no Dual or Multi prefix, hence there is
* only one name segment and Pathname is already pointing to it.
*/
NumSegments = 1;
"Simple Pathname (1 segment, Flags=%X)\n", Flags));
break;
}
}
/*
* Search namespace for each segment of the name. Loop through and
* verify (or add to the namespace) each name segment.
*
* The object type is significant only at the last name
* segment. (We don't care about the types along the path, only
* the type of the final target object.)
*/
while (NumSegments && CurrentNode)
{
NumSegments--;
if (!NumSegments)
{
/* This is the last segment, enable typechecking */
/*
* Only allow automatic parent search (search rules) if the caller
* requested it AND we have a single, non-fully-qualified NameSeg
*/
if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) &&
{
}
/* Set error flag according to caller */
if (Flags & ACPI_NS_ERROR_IF_FOUND)
{
}
}
/* Extract one ACPI name from the front of the pathname */
/* Try to find the single (4 character) ACPI name */
if (ACPI_FAILURE (Status))
{
if (Status == AE_NOT_FOUND)
{
/* Name not found in ACPI namespace */
"Name [%4.4s] not found in scope [%4.4s] %p\n",
CurrentNode));
}
*ReturnNode = ThisNode;
}
/* More segments to follow? */
if (NumSegments > 0)
{
/*
* If we have an alias to an object that opens a scope (such as a
* device or processor), we need to dereference the alias here so
* that we can access any children of the original node (via the
* remaining segments).
*/
{
{
}
if (AcpiNsOpensScope (((ACPI_NAMESPACE_NODE *)
{
}
}
}
/* Special handling for the last segment (NumSegments == 0) */
else
{
/*
* Sanity typecheck of the target object:
*
* If 1) This is the last segment (NumSegments == 0)
* 2) And we are looking for a specific type
* (Not checking for TYPE_ANY)
* 3) Which is not an alias
* 4) Which is not a local type (TYPE_SCOPE)
* 5) And the type of target object is known (not TYPE_ANY)
* 6) And target object does not match what we are looking for
*
* Then we have a type mismatch. Just warn and ignore it.
*/
if ((TypeToCheckFor != ACPI_TYPE_ANY) &&
(TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) &&
(TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) &&
{
/* Complain about a type mismatch */
"NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
ACPI_CAST_PTR (char, &SimpleName),
}
/*
* 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 (later) see if it opens a scope.
*/
if (Type == ACPI_TYPE_ANY)
{
}
}
/* Point to next name segment and make this node current */
Path += ACPI_NAME_SIZE;
}
/* Always check if we need to open a new scope */
{
/*
* If entry is a type which opens a scope, push the new scope on the
* scope stack.
*/
if (AcpiNsOpensScope (Type))
{
if (ACPI_FAILURE (Status))
{
}
}
}
*ReturnNode = ThisNode;
}