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/******************************************************************************
*
* Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
* parents and siblings and Scope manipulation
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2011, Intel Corp.
* 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.
*/
#define __NSUTILS_C__
#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#include <contrib/dev/acpica/include/acnamesp.h>
#include <contrib/dev/acpica/include/amlcode.h>
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME ("nsutils")
/* Local prototypes */
static BOOLEAN
AcpiNsValidPathSeparator (
char Sep);
#ifdef ACPI_OBSOLETE_FUNCTIONS
ACPI_NAME
AcpiNsFindParentName (
ACPI_NAMESPACE_NODE *NodeToSearch);
#endif
/*******************************************************************************
*
* FUNCTION: AcpiNsPrintNodePathname
*
* PARAMETERS: Node - Object
* Message - Prefix message
*
* DESCRIPTION: Print an object's full namespace pathname
* Manages allocation/freeing of a pathname buffer
*
******************************************************************************/
void
AcpiNsPrintNodePathname (
ACPI_NAMESPACE_NODE *Node,
const char *Message)
{
ACPI_BUFFER Buffer;
ACPI_STATUS Status;
if (!Node)
{
AcpiOsPrintf ("[NULL NAME]");
return;
}
/* Convert handle to full pathname and print it (with supplied message) */
Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
Status = AcpiNsHandleToPathname (Node, &Buffer);
if (ACPI_SUCCESS (Status))
{
if (Message)
{
AcpiOsPrintf ("%s ", Message);
}
AcpiOsPrintf ("[%s] (Node %p)", (char *) Buffer.Pointer, Node);
ACPI_FREE (Buffer.Pointer);
}
}
/*******************************************************************************
*
* FUNCTION: AcpiNsValidRootPrefix
*
* PARAMETERS: Prefix - Character to be checked
*
* RETURN: TRUE if a valid prefix
*
* DESCRIPTION: Check if a character is a valid ACPI Root prefix
*
******************************************************************************/
BOOLEAN
AcpiNsValidRootPrefix (
char Prefix)
{
return ((BOOLEAN) (Prefix == '\\'));
}
/*******************************************************************************
*
* FUNCTION: AcpiNsValidPathSeparator
*
* 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 BOOLEAN
AcpiNsValidPathSeparator (
char Sep)
{
return ((BOOLEAN) (Sep == '.'));
}
/*******************************************************************************
*
* FUNCTION: AcpiNsGetType
*
* 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
AcpiNsGetType (
ACPI_NAMESPACE_NODE *Node)
{
ACPI_FUNCTION_TRACE (NsGetType);
if (!Node)
{
ACPI_WARNING ((AE_INFO, "Null Node parameter"));
return_UINT32 (ACPI_TYPE_ANY);
}
return_UINT32 ((ACPI_OBJECT_TYPE) Node->Type);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsLocal
*
* 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.
*
******************************************************************************/
UINT32
AcpiNsLocal (
ACPI_OBJECT_TYPE Type)
{
ACPI_FUNCTION_TRACE (NsLocal);
if (!AcpiUtValidObjectType (Type))
{
/* Type code out of range */
ACPI_WARNING ((AE_INFO, "Invalid Object Type 0x%X", Type));
return_UINT32 (ACPI_NS_NORMAL);
}
return_UINT32 ((UINT32) AcpiGbl_NsProperties[Type] & ACPI_NS_LOCAL);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsGetInternalNameLength
*
* 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
AcpiNsGetInternalNameLength (
ACPI_NAMESTRING_INFO *Info)
{
const char *NextExternalChar;
UINT32 i;
ACPI_FUNCTION_ENTRY ();
NextExternalChar = Info->ExternalName;
Info->NumCarats = 0;
Info->NumSegments = 0;
Info->FullyQualified = FALSE;
/*
* For the internal name, the required length is 4 bytes per segment, plus
* 1 each for RootPrefix, MultiNamePrefixOp, segment count, trailing null
* (which is not really needed, but no there's harm in putting it there)
*
* strlen() + 1 covers the first NameSeg, which has no path separator
*/
if (AcpiNsValidRootPrefix (*NextExternalChar))
{
Info->FullyQualified = TRUE;
NextExternalChar++;
/* Skip redundant RootPrefix, like \\_SB.PCI0.SBRG.EC0 */
while (AcpiNsValidRootPrefix (*NextExternalChar))
{
NextExternalChar++;
}
}
else
{
/* Handle Carat prefixes */
while (*NextExternalChar == '^')
{
Info->NumCarats++;
NextExternalChar++;
}
}
/*
* 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 (*NextExternalChar)
{
Info->NumSegments = 1;
for (i = 0; NextExternalChar[i]; i++)
{
if (AcpiNsValidPathSeparator (NextExternalChar[i]))
{
Info->NumSegments++;
}
}
}
Info->Length = (ACPI_NAME_SIZE * Info->NumSegments) +
4 + Info->NumCarats;
Info->NextExternalChar = NextExternalChar;
}
/*******************************************************************************
*
* FUNCTION: AcpiNsBuildInternalName
*
* PARAMETERS: Info - Info struct fully initialized
*
* RETURN: Status
*
* DESCRIPTION: Construct the internal (AML) namestring
* corresponding to the external (ASL) namestring.
*
******************************************************************************/
ACPI_STATUS
AcpiNsBuildInternalName (
ACPI_NAMESTRING_INFO *Info)
{
UINT32 NumSegments = Info->NumSegments;
char *InternalName = Info->InternalName;
const char *ExternalName = Info->NextExternalChar;
char *Result = NULL;
UINT32 i;
ACPI_FUNCTION_TRACE (NsBuildInternalName);
/* Setup the correct prefixes, counts, and pointers */
if (Info->FullyQualified)
{
InternalName[0] = '\\';
if (NumSegments <= 1)
{
Result = &InternalName[1];
}
else if (NumSegments == 2)
{
InternalName[1] = AML_DUAL_NAME_PREFIX;
Result = &InternalName[2];
}
else
{
InternalName[1] = AML_MULTI_NAME_PREFIX_OP;
InternalName[2] = (char) NumSegments;
Result = &InternalName[3];
}
}
else
{
/*
* Not fully qualified.
* Handle Carats first, then append the name segments
*/
i = 0;
if (Info->NumCarats)
{
for (i = 0; i < Info->NumCarats; i++)
{
InternalName[i] = '^';
}
}
if (NumSegments <= 1)
{
Result = &InternalName[i];
}
else if (NumSegments == 2)
{
InternalName[i] = AML_DUAL_NAME_PREFIX;
Result = &InternalName[(ACPI_SIZE) i+1];
}
else
{
InternalName[i] = AML_MULTI_NAME_PREFIX_OP;
InternalName[(ACPI_SIZE) i+1] = (char) NumSegments;
Result = &InternalName[(ACPI_SIZE) i+2];
}
}
/* Build the name (minus path separators) */
for (; NumSegments; NumSegments--)
{
for (i = 0; i < ACPI_NAME_SIZE; i++)
{
if (AcpiNsValidPathSeparator (*ExternalName) ||
(*ExternalName == 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) *ExternalName);
ExternalName++;
}
}
/* Now we must have a path separator, or the pathname is bad */
if (!AcpiNsValidPathSeparator (*ExternalName) &&
(*ExternalName != 0))
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Move on the next segment */
ExternalName++;
Result += ACPI_NAME_SIZE;
}
/* Terminate the string */
*Result = 0;
if (Info->FullyQualified)
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (abs) \"\\%s\"\n",
InternalName, InternalName));
}
else
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
InternalName, InternalName));
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsInternalizeName
*
* PARAMETERS: *ExternalName - 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
AcpiNsInternalizeName (
const char *ExternalName,
char **ConvertedName)
{
char *InternalName;
ACPI_NAMESTRING_INFO Info;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (NsInternalizeName);
if ((!ExternalName) ||
(*ExternalName == 0) ||
(!ConvertedName))
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Get the length of the new internal name */
Info.ExternalName = ExternalName;
AcpiNsGetInternalNameLength (&Info);
/* We need a segment to store the internal name */
InternalName = ACPI_ALLOCATE_ZEROED (Info.Length);
if (!InternalName)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Build the name */
Info.InternalName = InternalName;
Status = AcpiNsBuildInternalName (&Info);
if (ACPI_FAILURE (Status))
{
ACPI_FREE (InternalName);
return_ACPI_STATUS (Status);
}
*ConvertedName = InternalName;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsExternalizeName
*
* PARAMETERS: InternalNameLength - Lenth of the internal name below
* InternalName - Internal representation of name
* ConvertedNameLength - Where the length is returned
* ConvertedName - Where the resulting external name
* is returned
*
* RETURN: Status
*
* DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
* to its external (printable) form (e.g. "\_PR_.CPU0")
*
******************************************************************************/
ACPI_STATUS
AcpiNsExternalizeName (
UINT32 InternalNameLength,
const char *InternalName,
UINT32 *ConvertedNameLength,
char **ConvertedName)
{
UINT32 NamesIndex = 0;
UINT32 NumSegments = 0;
UINT32 RequiredLength;
UINT32 PrefixLength = 0;
UINT32 i = 0;
UINT32 j = 0;
ACPI_FUNCTION_TRACE (NsExternalizeName);
if (!InternalNameLength ||
!InternalName ||
!ConvertedName)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Check for a prefix (one '\' | one or more '^') */
switch (InternalName[0])
{
case '\\':
PrefixLength = 1;
break;
case '^':
for (i = 0; i < InternalNameLength; i++)
{
if (InternalName[i] == '^')
{
PrefixLength = i + 1;
}
else
{
break;
}
}
if (i == InternalNameLength)
{
PrefixLength = i;
}
break;
default:
break;
}
/*
* Check for object names. Note that there could be 0-255 of these
* 4-byte elements.
*/
if (PrefixLength < InternalNameLength)
{
switch (InternalName[PrefixLength])
{
case AML_MULTI_NAME_PREFIX_OP:
/* <count> 4-byte names */
NamesIndex = PrefixLength + 2;
NumSegments = (UINT8)
InternalName[(ACPI_SIZE) PrefixLength + 1];
break;
case AML_DUAL_NAME_PREFIX:
/* Two 4-byte names */
NamesIndex = PrefixLength + 1;
NumSegments = 2;
break;
case 0:
/* NullName */
NamesIndex = 0;
NumSegments = 0;
break;
default:
/* one 4-byte name */
NamesIndex = PrefixLength;
NumSegments = 1;
break;
}
}
/*
* Calculate the length of ConvertedName, which equals the length
* of the prefix, length of all object names, length of any required
* punctuation ('.') between object names, plus the NULL terminator.
*/
RequiredLength = PrefixLength + (4 * NumSegments) +
((NumSegments > 0) ? (NumSegments - 1) : 0) + 1;
/*
* Check to see if we're still in bounds. If not, there's a problem
* with InternalName (invalid format).
*/
if (RequiredLength > InternalNameLength)
{
ACPI_ERROR ((AE_INFO, "Invalid internal name"));
return_ACPI_STATUS (AE_BAD_PATHNAME);
}
/* Build the ConvertedName */
*ConvertedName = ACPI_ALLOCATE_ZEROED (RequiredLength);
if (!(*ConvertedName))
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
j = 0;
for (i = 0; i < PrefixLength; i++)
{
(*ConvertedName)[j++] = InternalName[i];
}
if (NumSegments > 0)
{
for (i = 0; i < NumSegments; i++)
{
if (i > 0)
{
(*ConvertedName)[j++] = '.';
}
(*ConvertedName)[j++] = InternalName[NamesIndex++];
(*ConvertedName)[j++] = InternalName[NamesIndex++];
(*ConvertedName)[j++] = InternalName[NamesIndex++];
(*ConvertedName)[j++] = InternalName[NamesIndex++];
}
}
if (ConvertedNameLength)
{
*ConvertedNameLength = (UINT32) RequiredLength;
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsValidateHandle
*
* PARAMETERS: Handle - Handle to be validated and typecast to a
* namespace node.
*
* RETURN: A pointer to a namespace node
*
* DESCRIPTION: Convert a namespace handle to a namespace node. Handles special
* cases for the root node.
*
* NOTE: Real integer handles would allow for more verification
* and keep all pointers within this subsystem - however this introduces
* more overhead and has not been necessary to this point. Drivers
* holding handles are typically notified before a node becomes invalid
* due to a table unload.
*
******************************************************************************/
ACPI_NAMESPACE_NODE *
AcpiNsValidateHandle (
ACPI_HANDLE Handle)
{
ACPI_FUNCTION_ENTRY ();
/* Parameter validation */
if ((!Handle) || (Handle == ACPI_ROOT_OBJECT))
{
return (AcpiGbl_RootNode);
}
/* We can at least attempt to verify the handle */
if (ACPI_GET_DESCRIPTOR_TYPE (Handle) != ACPI_DESC_TYPE_NAMED)
{
return (NULL);
}
return (ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Handle));
}
/*******************************************************************************
*
* FUNCTION: AcpiNsTerminate
*
* PARAMETERS: none
*
* RETURN: none
*
* DESCRIPTION: free memory allocated for namespace and ACPI table storage.
*
******************************************************************************/
void
AcpiNsTerminate (
void)
{
ACPI_OPERAND_OBJECT *ObjDesc;
ACPI_FUNCTION_TRACE (NsTerminate);
/*
* 1) Free the entire namespace -- all nodes and objects
*
* Delete all object descriptors attached to namepsace nodes
*/
AcpiNsDeleteNamespaceSubtree (AcpiGbl_RootNode);
/* Detach any objects attached to the root */
ObjDesc = AcpiNsGetAttachedObject (AcpiGbl_RootNode);
if (ObjDesc)
{
AcpiNsDetachObject (AcpiGbl_RootNode);
}
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace freed\n"));
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: AcpiNsOpensScope
*
* PARAMETERS: Type - A valid namespace type
*
* RETURN: NEWSCOPE if the passed type "opens a name scope" according
* to the ACPI specification, else 0
*
******************************************************************************/
UINT32
AcpiNsOpensScope (
ACPI_OBJECT_TYPE Type)
{
ACPI_FUNCTION_TRACE_STR (NsOpensScope, AcpiUtGetTypeName (Type));
if (!AcpiUtValidObjectType (Type))
{
/* type code out of range */
ACPI_WARNING ((AE_INFO, "Invalid Object Type 0x%X", Type));
return_UINT32 (ACPI_NS_NORMAL);
}
return_UINT32 (((UINT32) AcpiGbl_NsProperties[Type]) & ACPI_NS_NEWSCOPE);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsGetNode
*
* PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The
* \ (backslash) and ^ (carat) prefixes, and the
* . (period) to separate segments are supported.
* PrefixNode - Root of subtree to be searched, or NS_ALL for the
* root of the name space. If Name is fully
* qualified (first INT8 is '\'), the passed value
* of Scope will not be accessed.
* Flags - Used to indicate whether to perform upsearch or
* not.
* ReturnNode - 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
AcpiNsGetNode (
ACPI_NAMESPACE_NODE *PrefixNode,
const char *Pathname,
UINT32 Flags,
ACPI_NAMESPACE_NODE **ReturnNode)
{
ACPI_GENERIC_STATE ScopeInfo;
ACPI_STATUS Status;
char *InternalPath;
ACPI_FUNCTION_TRACE_PTR (NsGetNode, ACPI_CAST_PTR (char, Pathname));
if (!Pathname)
{
*ReturnNode = PrefixNode;
if (!PrefixNode)
{
*ReturnNode = AcpiGbl_RootNode;
}
return_ACPI_STATUS (AE_OK);
}
/* Convert path to internal representation */
Status = AcpiNsInternalizeName (Pathname, &InternalPath);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Must lock namespace during lookup */
Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/* Setup lookup scope (search starting point) */
ScopeInfo.Scope.Node = PrefixNode;
/* Lookup the name in the namespace */
Status = AcpiNsLookup (&ScopeInfo, InternalPath, ACPI_TYPE_ANY,
ACPI_IMODE_EXECUTE, (Flags | ACPI_NS_DONT_OPEN_SCOPE),
NULL, ReturnNode);
if (ACPI_FAILURE (Status))
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s, %s\n",
Pathname, AcpiFormatException (Status)));
}
(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
Cleanup:
ACPI_FREE (InternalPath);
return_ACPI_STATUS (Status);
}