exmisc.c revision aa2aa9a662539940ddbc8610da5a3a874ebd7503
/******************************************************************************
*
* Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
*
*****************************************************************************/
/******************************************************************************
*
* 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 __EXMISC_C__
#include "acpi.h"
#include "accommon.h"
#include "acinterp.h"
#include "amlcode.h"
#include "amlresrc.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exmisc")
/*******************************************************************************
*
* FUNCTION: AcpiExGetObjectReference
*
* PARAMETERS: ObjDesc - Create a reference to this object
* ReturnDesc - Where to store the reference
* WalkState - Current state
*
* RETURN: Status
*
* DESCRIPTION: Obtain and return a "reference" to the target object
* Common code for the RefOfOp and the CondRefOfOp.
*
******************************************************************************/
{
*ReturnDesc = NULL;
switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
{
case ACPI_DESC_TYPE_OPERAND:
{
}
/*
* Must be a reference to a Local or Arg
*/
{
case ACPI_REFCLASS_LOCAL:
case ACPI_REFCLASS_ARG:
case ACPI_REFCLASS_DEBUG:
break;
default:
}
break;
case ACPI_DESC_TYPE_NAMED:
/*
* A named reference that has already been resolved to a Node
*/
break;
default:
}
/* Create a new reference object */
if (!ReferenceObj)
{
}
"Object %p Type [%s], returning Reference %p\n",
}
/*******************************************************************************
*
* FUNCTION: AcpiExConcatTemplate
*
* PARAMETERS: Operand0 - First source object
* Operand1 - Second source object
* ActualReturnDesc - Where to place the return object
* WalkState - Current walk state
*
* RETURN: Status
*
* DESCRIPTION: Concatenate two resource templates
*
******************************************************************************/
{
/*
* Find the EndTag descriptor in each resource template.
* Note1: returned pointers point TO the EndTag, not past it.
* Note2: zero-length buffers are allowed; treated like one EndTag
*/
/* Get the length of the first resource template */
if (ACPI_FAILURE (Status))
{
}
/* Get the length of the second resource template */
if (ACPI_FAILURE (Status))
{
}
/* Combine both lengths, minimum size will be 2 for EndTag */
/* Create a new buffer object for the result (with one EndTag) */
if (!ReturnDesc)
{
}
/*
* Copy the templates to the new buffer, 0 first, then 1 follows. One
* EndTag descriptor is copied from Operand1.
*/
/* Insert EndTag and set the checksum to zero, means "ignore checksum" */
/* Return the completed resource template */
}
/*******************************************************************************
*
* FUNCTION: AcpiExDoConcatenate
*
* PARAMETERS: Operand0 - First source object
* Operand1 - Second source object
* ActualReturnDesc - Where to place the return object
* WalkState - Current walk state
*
* RETURN: Status
*
* DESCRIPTION: Concatenate two objects OF THE SAME TYPE.
*
******************************************************************************/
{
char *NewBuf;
/*
* Convert the second operand if necessary. The first operand
* determines the type of the second operand, (See the Data Types
* section of the ACPI specification.) Both object types are
* resolution mechanism.
*/
{
case ACPI_TYPE_INTEGER:
break;
case ACPI_TYPE_STRING:
break;
case ACPI_TYPE_BUFFER:
break;
default:
}
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/*
* Both operands are now known to be the same object type
* (Both are Integer, String, or Buffer), and we can now perform the
* concatenation.
*/
/*
* There are three cases to handle:
*
* 1) Two Integers concatenated to produce a new Buffer
* 2) Two Strings concatenated to produce a new String
* 3) Two Buffers concatenated to produce a new Buffer
*/
{
case ACPI_TYPE_INTEGER:
/* Result of two Integers is a Buffer */
/* Need enough buffer space for two integers */
if (!ReturnDesc)
{
goto Cleanup;
}
/* Copy the first integer, LSB first */
/* Copy the second integer (LSB first) after the first */
break;
case ACPI_TYPE_STRING:
/* Result of two Strings is a String */
if (!ReturnDesc)
{
goto Cleanup;
}
/* Concatenate the strings */
break;
case ACPI_TYPE_BUFFER:
/* Result of two Buffers is a Buffer */
if (!ReturnDesc)
{
goto Cleanup;
}
/* Concatenate the buffers */
break;
default:
/* Invalid object type, should not happen here */
goto Cleanup;
}
if (LocalOperand1 != Operand1)
{
}
}
/*******************************************************************************
*
* FUNCTION: AcpiExDoMathOp
*
* PARAMETERS: Opcode - AML opcode
* Integer0 - Integer operand #0
* Integer1 - Integer operand #1
*
* RETURN: Integer result of the operation
*
* DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
* math functions here is to prevent a lot of pointer dereferencing
* to obtain the operands.
*
******************************************************************************/
{
switch (Opcode)
{
case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */
case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */
case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */
case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */
case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */
case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */
case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */
case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/
/*
* We need to check if the shiftcount is larger than the integer bit
* width since the behavior of this is not well-defined in the C language.
*/
if (Integer1 >= AcpiGbl_IntegerBitWidth)
{
return (0);
}
case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */
/*
* We need to check if the shiftcount is larger than the integer bit
* width since the behavior of this is not well-defined in the C language.
*/
if (Integer1 >= AcpiGbl_IntegerBitWidth)
{
return (0);
}
case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */
default:
return (0);
}
}
/*******************************************************************************
*
* FUNCTION: AcpiExDoLogicalNumericOp
*
* PARAMETERS: Opcode - AML opcode
* Integer0 - Integer operand #0
* Integer1 - Integer operand #1
*
* RETURN: Status
*
* DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
* operators (LAnd and LOr), both operands must be integers.
*
* Note: cleanest machine code seems to be produced by the code
* below, rather than using statements of the form:
* Result = (Integer0 && Integer1);
*
******************************************************************************/
{
switch (Opcode)
{
case AML_LAND_OP: /* LAnd (Integer0, Integer1) */
{
LocalResult = TRUE;
}
break;
case AML_LOR_OP: /* LOr (Integer0, Integer1) */
{
LocalResult = TRUE;
}
break;
default:
break;
}
/* Return the logical result and status */
}
/*******************************************************************************
*
* FUNCTION: AcpiExDoLogicalOp
*
* PARAMETERS: Opcode - AML opcode
* Operand0 - operand #0
* Operand1 - operand #1
*
* RETURN: Status
*
* DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
* functions here is to prevent a lot of pointer dereferencing
* to obtain the operands and to simplify the generation of the
* logical value. For the Numeric operators (LAnd and LOr), both
* operands must be integers. For the other logical operators,
* first operand determines the type to which the second operand
* will be converted.
*
* Note: cleanest machine code seems to be produced by the code
* below, rather than using statements of the form:
* Result = (Operand0 == Operand1);
*
******************************************************************************/
{
int Compare;
/*
* Convert the second operand if necessary. The first operand
* determines the type of the second operand, (See the Data Types
* section of the ACPI 3.0+ specification.) Both object types are
* resolution mechanism.
*/
{
case ACPI_TYPE_INTEGER:
break;
case ACPI_TYPE_STRING:
break;
case ACPI_TYPE_BUFFER:
break;
default:
break;
}
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/*
* Two cases: 1) Both Integers, 2) Both Strings or Buffers
*/
{
/*
* 1) Both operands are of type integer
* Note: LocalOperand1 may have changed above
*/
switch (Opcode)
{
case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
{
LocalResult = TRUE;
}
break;
case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
{
LocalResult = TRUE;
}
break;
case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
{
LocalResult = TRUE;
}
break;
default:
break;
}
}
else
{
/*
* 2) Both operands are Strings or both are Buffers
* object fields. LocalOperand1 may have changed above. Use
* memcmp to handle nulls in buffers.
*/
/* Lexicographic compare: compare the data bytes */
switch (Opcode)
{
case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
/* Length and all bytes must be equal */
(Compare == 0))
{
/* Length and all bytes match ==> TRUE */
LocalResult = TRUE;
}
break;
case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
if (Compare > 0)
{
LocalResult = TRUE;
goto Cleanup; /* TRUE */
}
if (Compare < 0)
{
goto Cleanup; /* FALSE */
}
/* Bytes match (to shortest length), compare lengths */
{
LocalResult = TRUE;
}
break;
case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
if (Compare > 0)
{
goto Cleanup; /* FALSE */
}
if (Compare < 0)
{
LocalResult = TRUE;
goto Cleanup; /* TRUE */
}
/* Bytes match (to shortest length), compare lengths */
{
LocalResult = TRUE;
}
break;
default:
break;
}
}
/* New object was created if implicit conversion performed - delete */
if (LocalOperand1 != Operand1)
{
}
/* Return the logical result and status */
}