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NetBSD/sys/dist/acpica/exnames.c

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/******************************************************************************
*
* Module Name: exnames - interpreter/scanner name load/execute
* $Revision: 1.4 $
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2008, 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
* documentation and/or other materials provided with distribution. In
* 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
* provision in the documentation and/or other materials provided with the
* 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
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* 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 __EXNAMES_C__
#include "acpi.h"
#include "acinterp.h"
#include "amlcode.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exnames")
/* Local prototypes */
static char *
AcpiExAllocateNameString (
UINT32 PrefixCount,
UINT32 NumNameSegs);
static ACPI_STATUS
AcpiExNameSegment (
UINT8 **InAmlAddress,
char *NameString);
/*******************************************************************************
*
* FUNCTION: AcpiExAllocateNameString
*
* PARAMETERS: PrefixCount - Count of parent levels. Special cases:
* (-1)==root, 0==none
* NumNameSegs - count of 4-character name segments
*
* RETURN: A pointer to the allocated string segment. This segment must
* be deleted by the caller.
*
* DESCRIPTION: Allocate a buffer for a name string. Ensure allocated name
* string is long enough, and set up prefix if any.
*
******************************************************************************/
static char *
AcpiExAllocateNameString (
UINT32 PrefixCount,
UINT32 NumNameSegs)
{
char *TempPtr;
char *NameString;
UINT32 SizeNeeded;
ACPI_FUNCTION_TRACE (ExAllocateNameString);
/*
* Allow room for all \ and ^ prefixes, all segments and a MultiNamePrefix.
* Also, one byte for the null terminator.
* This may actually be somewhat longer than needed.
*/
if (PrefixCount == ACPI_UINT32_MAX)
{
/* Special case for root */
SizeNeeded = 1 + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1;
}
else
{
SizeNeeded = PrefixCount + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1;
}
/*
* Allocate a buffer for the name.
* This buffer must be deleted by the caller!
*/
NameString = ACPI_ALLOCATE (SizeNeeded);
if (!NameString)
{
ACPI_ERROR ((AE_INFO,
"Could not allocate size %d", SizeNeeded));
return_PTR (NULL);
}
TempPtr = NameString;
/* Set up Root or Parent prefixes if needed */
if (PrefixCount == ACPI_UINT32_MAX)
{
*TempPtr++ = AML_ROOT_PREFIX;
}
else
{
while (PrefixCount--)
{
*TempPtr++ = AML_PARENT_PREFIX;
}
}
/* Set up Dual or Multi prefixes if needed */
if (NumNameSegs > 2)
{
/* Set up multi prefixes */
*TempPtr++ = AML_MULTI_NAME_PREFIX_OP;
*TempPtr++ = (char) NumNameSegs;
}
else if (2 == NumNameSegs)
{
/* Set up dual prefixes */
*TempPtr++ = AML_DUAL_NAME_PREFIX;
}
/*
* Terminate string following prefixes. AcpiExNameSegment() will
* append the segment(s)
*/
*TempPtr = 0;
return_PTR (NameString);
}
/*******************************************************************************
*
* FUNCTION: AcpiExNameSegment
*
* PARAMETERS: InAmlAddress - Pointer to the name in the AML code
* NameString - Where to return the name. The name is appended
* to any existing string to form a namepath
*
* RETURN: Status
*
* DESCRIPTION: Extract an ACPI name (4 bytes) from the AML byte stream
*
******************************************************************************/
static ACPI_STATUS
AcpiExNameSegment (
UINT8 **InAmlAddress,
char *NameString)
{
char *AmlAddress = (void *) *InAmlAddress;
ACPI_STATUS Status = AE_OK;
UINT32 Index;
char CharBuf[5];
ACPI_FUNCTION_TRACE (ExNameSegment);
/*
* If first character is a digit, then we know that we aren't looking at a
* valid name segment
*/
CharBuf[0] = *AmlAddress;
if ('0' <= CharBuf[0] && CharBuf[0] <= '9')
{
ACPI_ERROR ((AE_INFO, "Invalid leading digit: %c", CharBuf[0]));
return_ACPI_STATUS (AE_CTRL_PENDING);
}
ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "Bytes from stream:\n"));
for (Index = 0;
(Index < ACPI_NAME_SIZE) && (AcpiUtValidAcpiChar (*AmlAddress, 0));
Index++)
{
CharBuf[Index] = *AmlAddress++;
ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "%c\n", CharBuf[Index]));
}
/* Valid name segment */
if (Index == 4)
{
/* Found 4 valid characters */
CharBuf[4] = '\0';
if (NameString)
{
ACPI_STRCAT (NameString, CharBuf);
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
"Appended to - %s\n", NameString));
}
else
{
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
"No Name string - %s\n", CharBuf));
}
}
else if (Index == 0)
{
/*
* First character was not a valid name character,
* so we are looking at something other than a name.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Leading character is not alpha: %02Xh (not a name)\n",
CharBuf[0]));
Status = AE_CTRL_PENDING;
}
else
{
/*
* Segment started with one or more valid characters, but fewer than
* the required 4
*/
Status = AE_AML_BAD_NAME;
ACPI_ERROR ((AE_INFO,
"Bad character %02x in name, at %p",
*AmlAddress, AmlAddress));
}
*InAmlAddress = ACPI_CAST_PTR (UINT8, AmlAddress);
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiExGetNameString
*
* PARAMETERS: DataType - Object type to be associated with this
* name
* InAmlAddress - Pointer to the namestring in the AML code
* OutNameString - Where the namestring is returned
* OutNameLength - Length of the returned string
*
* RETURN: Status, namestring and length
*
* DESCRIPTION: Extract a full namepath from the AML byte stream,
* including any prefixes.
*
******************************************************************************/
ACPI_STATUS
AcpiExGetNameString (
ACPI_OBJECT_TYPE DataType,
UINT8 *InAmlAddress,
char **OutNameString,
UINT32 *OutNameLength)
{
ACPI_STATUS Status = AE_OK;
UINT8 *AmlAddress = InAmlAddress;
char *NameString = NULL;
UINT32 NumSegments;
UINT32 PrefixCount = 0;
BOOLEAN HasPrefix = FALSE;
ACPI_FUNCTION_TRACE_PTR (ExGetNameString, AmlAddress);
if (ACPI_TYPE_LOCAL_REGION_FIELD == DataType ||
ACPI_TYPE_LOCAL_BANK_FIELD == DataType ||
ACPI_TYPE_LOCAL_INDEX_FIELD == DataType)
{
/* Disallow prefixes for types associated with FieldUnit names */
NameString = AcpiExAllocateNameString (0, 1);
if (!NameString)
{
Status = AE_NO_MEMORY;
}
else
{
Status = AcpiExNameSegment (&AmlAddress, NameString);
}
}
else
{
/*
* DataType is not a field name.
* Examine first character of name for root or parent prefix operators
*/
switch (*AmlAddress)
{
case AML_ROOT_PREFIX:
ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "RootPrefix(\\) at %p\n",
AmlAddress));
/*
* Remember that we have a RootPrefix --
* see comment in AcpiExAllocateNameString()
*/
AmlAddress++;
PrefixCount = ACPI_UINT32_MAX;
HasPrefix = TRUE;
break;
case AML_PARENT_PREFIX:
/* Increment past possibly multiple parent prefixes */
do
{
ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "ParentPrefix (^) at %p\n",
AmlAddress));
AmlAddress++;
PrefixCount++;
} while (*AmlAddress == AML_PARENT_PREFIX);
HasPrefix = TRUE;
break;
default:
/* Not a prefix character */
break;
}
/* Examine first character of name for name segment prefix operator */
switch (*AmlAddress)
{
case AML_DUAL_NAME_PREFIX:
ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "DualNamePrefix at %p\n",
AmlAddress));
AmlAddress++;
NameString = AcpiExAllocateNameString (PrefixCount, 2);
if (!NameString)
{
Status = AE_NO_MEMORY;
break;
}
/* Indicate that we processed a prefix */
HasPrefix = TRUE;
Status = AcpiExNameSegment (&AmlAddress, NameString);
if (ACPI_SUCCESS (Status))
{
Status = AcpiExNameSegment (&AmlAddress, NameString);
}
break;
case AML_MULTI_NAME_PREFIX_OP:
ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "MultiNamePrefix at %p\n",
AmlAddress));
/* Fetch count of segments remaining in name path */
AmlAddress++;
NumSegments = *AmlAddress;
NameString = AcpiExAllocateNameString (PrefixCount, NumSegments);
if (!NameString)
{
Status = AE_NO_MEMORY;
break;
}
/* Indicate that we processed a prefix */
AmlAddress++;
HasPrefix = TRUE;
while (NumSegments &&
(Status = AcpiExNameSegment (&AmlAddress, NameString)) ==
AE_OK)
{
NumSegments--;
}
break;
case 0:
/* NullName valid as of 8-12-98 ASL/AML Grammar Update */
if (PrefixCount == ACPI_UINT32_MAX)
{
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"NameSeg is \"\\\" followed by NULL\n"));
}
/* Consume the NULL byte */
AmlAddress++;
NameString = AcpiExAllocateNameString (PrefixCount, 0);
if (!NameString)
{
Status = AE_NO_MEMORY;
break;
}
break;
default:
/* Name segment string */
NameString = AcpiExAllocateNameString (PrefixCount, 1);
if (!NameString)
{
Status = AE_NO_MEMORY;
break;
}
Status = AcpiExNameSegment (&AmlAddress, NameString);
break;
}
}
if (AE_CTRL_PENDING == Status && HasPrefix)
{
/* Ran out of segments after processing a prefix */
ACPI_ERROR ((AE_INFO,
"Malformed Name at %p", NameString));
Status = AE_AML_BAD_NAME;
}
if (ACPI_FAILURE (Status))
{
if (NameString)
{
ACPI_FREE (NameString);
}
return_ACPI_STATUS (Status);
}
*OutNameString = NameString;
*OutNameLength = (UINT32) (AmlAddress - InAmlAddress);
return_ACPI_STATUS (Status);
}
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