exfield.c revision 30082d0cc16bf5799269ca464a219de900f519cd
/******************************************************************************
*
* Module Name: exfield - ACPI AML (p-code) execution - field manipulation
* $Revision: 1.126 $
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2006, 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 __EXFIELD_C__
#include "acpi.h"
#include "acdispat.h"
#include "acinterp.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exfield")
/*******************************************************************************
*
* FUNCTION: AcpiExReadDataFromField
*
* PARAMETERS: WalkState - Current execution state
* ObjDesc - The named field
* RetBufferDesc - Where the return data object is stored
*
* RETURN: Status
*
* DESCRIPTION: Read from a named field. Returns either an Integer or a
* Buffer, depending on the size of the field.
*
******************************************************************************/
{
void *Buffer;
/* Parameter validation */
if (!ObjDesc)
{
}
if (!RetBufferDesc)
{
}
{
/*
* If the BufferField arguments have not been previously evaluated,
* evaluate them now and save the results.
*/
{
if (ACPI_FAILURE (Status))
{
}
}
}
{
/*
* This is an SMBus read. We must create a buffer to hold the data
* and directly access the region handler.
*/
if (!BufferDesc)
{
}
/* Lock entire transaction if requested */
/*
* Perform the read.
* Note: Smbus protocol value is passed in upper 16-bits of Function
*/
goto Exit;
}
/*
* Allocate a buffer for the contents of the field.
*
* If the field is larger than the size of an ACPI_INTEGER, create
* a BUFFER to hold it. Otherwise, use an INTEGER. This allows
* the use of arithmetic operators on the returned value if the
* field size is equal or smaller than an Integer.
*
* Note: Field.length is in bits.
*/
if (Length > AcpiGbl_IntegerByteWidth)
{
/* Field is too large for an Integer, create a Buffer instead */
if (!BufferDesc)
{
}
}
else
{
/* Field will fit within an Integer (normal case) */
if (!BufferDesc)
{
}
}
"FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
"FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
/* Lock entire transaction if requested */
/* Read from the field */
Exit:
if (ACPI_FAILURE (Status))
{
}
else
{
}
}
/*******************************************************************************
*
* FUNCTION: AcpiExWriteDataToField
*
* PARAMETERS: SourceDesc - Contains data to write
* ObjDesc - The named field
* ResultDesc - Where the return value is returned, if any
*
* RETURN: Status
*
* DESCRIPTION: Write to a named field
*
******************************************************************************/
{
void *Buffer;
void *NewBuffer;
/* Parameter validation */
if (!SourceDesc || !ObjDesc)
{
}
{
/*
* If the BufferField arguments have not been previously evaluated,
* evaluate them now and save the results.
*/
{
if (ACPI_FAILURE (Status))
{
}
}
}
{
/*
* This is an SMBus write. We will bypass the entire field mechanism
* and handoff the buffer directly to the handler.
*
* Source must be a buffer of sufficient size (ACPI_SMBUS_BUFFER_SIZE).
*/
{
}
{
"SMBus write requires Buffer of length %X, found length %X",
}
if (!BufferDesc)
{
}
/* Lock entire transaction if requested */
/*
* Perform the write (returns status and perhaps data in the
* same buffer)
* Note: SMBus protocol type is passed in upper 16-bits of Function.
*/
(ACPI_INTEGER *) Buffer,
*ResultDesc = BufferDesc;
}
/* Get a pointer to the data to be written */
switch (ACPI_GET_OBJECT_TYPE (SourceDesc))
{
case ACPI_TYPE_INTEGER:
break;
case ACPI_TYPE_BUFFER:
break;
case ACPI_TYPE_STRING:
break;
default:
}
/*
* We must have a buffer that is at least as long as the field
* we are writing to. This is because individual fields are
* indivisible and partial writes are not supported -- as per
* the ACPI specification.
*/
if (Length < RequiredLength)
{
/* We need to create a new buffer */
if (!NewBuffer)
{
}
/*
* Copy the original data to the new buffer, starting
* at Byte zero. All unused (upper) bytes of the
* buffer will be 0.
*/
}
"FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
"FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
/* Lock entire transaction if requested */
/* Write to the field */
/* Free temporary buffer if we used one */
if (NewBuffer)
{
}
}