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minix/drivers/acpi/executer/exmisc.c

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ACPI driver - 99% of the code is Intel's ACPICA. The license is compliant with BSD and GNU and virtually all systems that use ACPI use this code, For instance it is part of the Linux kernel. - The only minix specific files are acpi.c osminixxf.c platform/acminix.h and include/minix/acpi.h - At the moment the driver does not register interrupt hooks which I believe is mainly for handling PnP, events like "battery level is low" and power management. Should not be difficult to add it if need be. - The interface to the outside world is virtually non-existent except a trivial message based service for PCI driver to query which device is connected to what IRQ line. This will evolve as more components start using this driver. VM, Scheduler and IOMMU are the possible users right now. - because of dependency on a native 64bit (long long, part of c99) it is compiled only with a gnu-like compilers which in case of Minix includes gcc llvm-gcc and clang
2010-09-02 17:44:04 +02:00
/******************************************************************************
*
* Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2010, 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 __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.
*
******************************************************************************/
ACPI_STATUS
AcpiExGetObjectReference (
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **ReturnDesc,
ACPI_WALK_STATE *WalkState)
{
ACPI_OPERAND_OBJECT *ReferenceObj;
ACPI_OPERAND_OBJECT *ReferencedObj;
ACPI_FUNCTION_TRACE_PTR (ExGetObjectReference, ObjDesc);
*ReturnDesc = NULL;
switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
{
case ACPI_DESC_TYPE_OPERAND:
if (ObjDesc->Common.Type != ACPI_TYPE_LOCAL_REFERENCE)
{
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
/*
* Must be a reference to a Local or Arg
*/
switch (ObjDesc->Reference.Class)
{
case ACPI_REFCLASS_LOCAL:
case ACPI_REFCLASS_ARG:
case ACPI_REFCLASS_DEBUG:
/* The referenced object is the pseudo-node for the local/arg */
ReferencedObj = ObjDesc->Reference.Object;
break;
default:
ACPI_ERROR ((AE_INFO, "Unknown Reference Class 0x%2.2X",
ObjDesc->Reference.Class));
return_ACPI_STATUS (AE_AML_INTERNAL);
}
break;
case ACPI_DESC_TYPE_NAMED:
/*
* A named reference that has already been resolved to a Node
*/
ReferencedObj = ObjDesc;
break;
default:
ACPI_ERROR ((AE_INFO, "Invalid descriptor type 0x%X",
ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)));
return_ACPI_STATUS (AE_TYPE);
}
/* Create a new reference object */
ReferenceObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE);
if (!ReferenceObj)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
ReferenceObj->Reference.Class = ACPI_REFCLASS_REFOF;
ReferenceObj->Reference.Object = ReferencedObj;
*ReturnDesc = ReferenceObj;
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Object %p Type [%s], returning Reference %p\n",
ObjDesc, AcpiUtGetObjectTypeName (ObjDesc), *ReturnDesc));
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* 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
*
******************************************************************************/
ACPI_STATUS
AcpiExConcatTemplate (
ACPI_OPERAND_OBJECT *Operand0,
ACPI_OPERAND_OBJECT *Operand1,
ACPI_OPERAND_OBJECT **ActualReturnDesc,
ACPI_WALK_STATE *WalkState)
{
ACPI_STATUS Status;
ACPI_OPERAND_OBJECT *ReturnDesc;
UINT8 *NewBuf;
UINT8 *EndTag;
ACPI_SIZE Length0;
ACPI_SIZE Length1;
ACPI_SIZE NewLength;
ACPI_FUNCTION_TRACE (ExConcatTemplate);
/*
* 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 */
Status = AcpiUtGetResourceEndTag (Operand0, &EndTag);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
Length0 = ACPI_PTR_DIFF (EndTag, Operand0->Buffer.Pointer);
/* Get the length of the second resource template */
Status = AcpiUtGetResourceEndTag (Operand1, &EndTag);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
Length1 = ACPI_PTR_DIFF (EndTag, Operand1->Buffer.Pointer);
/* Combine both lengths, minimum size will be 2 for EndTag */
NewLength = Length0 + Length1 + sizeof (AML_RESOURCE_END_TAG);
/* Create a new buffer object for the result (with one EndTag) */
ReturnDesc = AcpiUtCreateBufferObject (NewLength);
if (!ReturnDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/*
* Copy the templates to the new buffer, 0 first, then 1 follows. One
* EndTag descriptor is copied from Operand1.
*/
NewBuf = ReturnDesc->Buffer.Pointer;
ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer, Length0);
ACPI_MEMCPY (NewBuf + Length0, Operand1->Buffer.Pointer, Length1);
/* Insert EndTag and set the checksum to zero, means "ignore checksum" */
NewBuf[NewLength - 1] = 0;
NewBuf[NewLength - 2] = ACPI_RESOURCE_NAME_END_TAG | 1;
/* Return the completed resource template */
*ActualReturnDesc = ReturnDesc;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* 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.
*
******************************************************************************/
ACPI_STATUS
AcpiExDoConcatenate (
ACPI_OPERAND_OBJECT *Operand0,
ACPI_OPERAND_OBJECT *Operand1,
ACPI_OPERAND_OBJECT **ActualReturnDesc,
ACPI_WALK_STATE *WalkState)
{
ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1;
ACPI_OPERAND_OBJECT *ReturnDesc;
char *NewBuf;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (ExDoConcatenate);
/*
* 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
* guaranteed to be either Integer/String/Buffer by the operand
* resolution mechanism.
*/
switch (Operand0->Common.Type)
{
case ACPI_TYPE_INTEGER:
Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16);
break;
case ACPI_TYPE_STRING:
Status = AcpiExConvertToString (Operand1, &LocalOperand1,
ACPI_IMPLICIT_CONVERT_HEX);
break;
case ACPI_TYPE_BUFFER:
Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1);
break;
default:
ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X",
Operand0->Common.Type));
Status = AE_AML_INTERNAL;
}
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
*/
switch (Operand0->Common.Type)
{
case ACPI_TYPE_INTEGER:
/* Result of two Integers is a Buffer */
/* Need enough buffer space for two integers */
ReturnDesc = AcpiUtCreateBufferObject ((ACPI_SIZE)
ACPI_MUL_2 (AcpiGbl_IntegerByteWidth));
if (!ReturnDesc)
{
Status = AE_NO_MEMORY;
goto Cleanup;
}
NewBuf = (char *) ReturnDesc->Buffer.Pointer;
/* Copy the first integer, LSB first */
ACPI_MEMCPY (NewBuf, &Operand0->Integer.Value,
AcpiGbl_IntegerByteWidth);
/* Copy the second integer (LSB first) after the first */
ACPI_MEMCPY (NewBuf + AcpiGbl_IntegerByteWidth,
&LocalOperand1->Integer.Value,
AcpiGbl_IntegerByteWidth);
break;
case ACPI_TYPE_STRING:
/* Result of two Strings is a String */
ReturnDesc = AcpiUtCreateStringObject (
((ACPI_SIZE) Operand0->String.Length +
LocalOperand1->String.Length));
if (!ReturnDesc)
{
Status = AE_NO_MEMORY;
goto Cleanup;
}
NewBuf = ReturnDesc->String.Pointer;
/* Concatenate the strings */
ACPI_STRCPY (NewBuf, Operand0->String.Pointer);
ACPI_STRCPY (NewBuf + Operand0->String.Length,
LocalOperand1->String.Pointer);
break;
case ACPI_TYPE_BUFFER:
/* Result of two Buffers is a Buffer */
ReturnDesc = AcpiUtCreateBufferObject (
((ACPI_SIZE) Operand0->Buffer.Length +
LocalOperand1->Buffer.Length));
if (!ReturnDesc)
{
Status = AE_NO_MEMORY;
goto Cleanup;
}
NewBuf = (char *) ReturnDesc->Buffer.Pointer;
/* Concatenate the buffers */
ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer,
Operand0->Buffer.Length);
ACPI_MEMCPY (NewBuf + Operand0->Buffer.Length,
LocalOperand1->Buffer.Pointer,
LocalOperand1->Buffer.Length);
break;
default:
/* Invalid object type, should not happen here */
ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X",
Operand0->Common.Type));
Status =AE_AML_INTERNAL;
goto Cleanup;
}
*ActualReturnDesc = ReturnDesc;
Cleanup:
if (LocalOperand1 != Operand1)
{
AcpiUtRemoveReference (LocalOperand1);
}
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* 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.
*
******************************************************************************/
UINT64
AcpiExDoMathOp (
UINT16 Opcode,
UINT64 Integer0,
UINT64 Integer1)
{
ACPI_FUNCTION_ENTRY ();
switch (Opcode)
{
case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */
return (Integer0 + Integer1);
case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */
return (Integer0 & Integer1);
case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */
return (~(Integer0 & Integer1));
case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */
return (Integer0 | Integer1);
case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */
return (~(Integer0 | Integer1));
case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */
return (Integer0 ^ Integer1);
case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */
return (Integer0 * Integer1);
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);
}
return (Integer0 << Integer1);
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);
}
return (Integer0 >> Integer1);
case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */
return (Integer0 - Integer1);
default:
return (0);
}
}
/*******************************************************************************
*
* FUNCTION: AcpiExDoLogicalNumericOp
*
* PARAMETERS: Opcode - AML opcode
* Integer0 - Integer operand #0
* Integer1 - Integer operand #1
* LogicalResult - TRUE/FALSE result of the operation
*
* 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);
*
******************************************************************************/
ACPI_STATUS
AcpiExDoLogicalNumericOp (
UINT16 Opcode,
UINT64 Integer0,
UINT64 Integer1,
BOOLEAN *LogicalResult)
{
ACPI_STATUS Status = AE_OK;
BOOLEAN LocalResult = FALSE;
ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp);
switch (Opcode)
{
case AML_LAND_OP: /* LAnd (Integer0, Integer1) */
if (Integer0 && Integer1)
{
LocalResult = TRUE;
}
break;
case AML_LOR_OP: /* LOr (Integer0, Integer1) */
if (Integer0 || Integer1)
{
LocalResult = TRUE;
}
break;
default:
Status = AE_AML_INTERNAL;
break;
}
/* Return the logical result and status */
*LogicalResult = LocalResult;
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiExDoLogicalOp
*
* PARAMETERS: Opcode - AML opcode
* Operand0 - operand #0
* Operand1 - operand #1
* LogicalResult - TRUE/FALSE result of the operation
*
* 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,
* operands can be any combination of Integer/String/Buffer. The
* 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);
*
******************************************************************************/
ACPI_STATUS
AcpiExDoLogicalOp (
UINT16 Opcode,
ACPI_OPERAND_OBJECT *Operand0,
ACPI_OPERAND_OBJECT *Operand1,
BOOLEAN *LogicalResult)
{
ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1;
UINT64 Integer0;
UINT64 Integer1;
UINT32 Length0;
UINT32 Length1;
ACPI_STATUS Status = AE_OK;
BOOLEAN LocalResult = FALSE;
int Compare;
ACPI_FUNCTION_TRACE (ExDoLogicalOp);
/*
* 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
* guaranteed to be either Integer/String/Buffer by the operand
* resolution mechanism.
*/
switch (Operand0->Common.Type)
{
case ACPI_TYPE_INTEGER:
Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16);
break;
case ACPI_TYPE_STRING:
Status = AcpiExConvertToString (Operand1, &LocalOperand1,
ACPI_IMPLICIT_CONVERT_HEX);
break;
case ACPI_TYPE_BUFFER:
Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1);
break;
default:
Status = AE_AML_INTERNAL;
break;
}
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/*
* Two cases: 1) Both Integers, 2) Both Strings or Buffers
*/
if (Operand0->Common.Type == ACPI_TYPE_INTEGER)
{
/*
* 1) Both operands are of type integer
* Note: LocalOperand1 may have changed above
*/
Integer0 = Operand0->Integer.Value;
Integer1 = LocalOperand1->Integer.Value;
switch (Opcode)
{
case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
if (Integer0 == Integer1)
{
LocalResult = TRUE;
}
break;
case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
if (Integer0 > Integer1)
{
LocalResult = TRUE;
}
break;
case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
if (Integer0 < Integer1)
{
LocalResult = TRUE;
}
break;
default:
Status = AE_AML_INTERNAL;
break;
}
}
else
{
/*
* 2) Both operands are Strings or both are Buffers
* Note: Code below takes advantage of common Buffer/String
* object fields. LocalOperand1 may have changed above. Use
* memcmp to handle nulls in buffers.
*/
Length0 = Operand0->Buffer.Length;
Length1 = LocalOperand1->Buffer.Length;
/* Lexicographic compare: compare the data bytes */
Compare = ACPI_MEMCMP (Operand0->Buffer.Pointer,
LocalOperand1->Buffer.Pointer,
(Length0 > Length1) ? Length1 : Length0);
switch (Opcode)
{
case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
/* Length and all bytes must be equal */
if ((Length0 == Length1) &&
(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 */
if (Length0 > Length1)
{
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 */
if (Length0 < Length1)
{
LocalResult = TRUE;
}
break;
default:
Status = AE_AML_INTERNAL;
break;
}
}
Cleanup:
/* New object was created if implicit conversion performed - delete */
if (LocalOperand1 != Operand1)
{
AcpiUtRemoveReference (LocalOperand1);
}
/* Return the logical result and status */
*LogicalResult = LocalResult;
return_ACPI_STATUS (Status);
}
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