403 lines
14 KiB
C
403 lines
14 KiB
C
/******************************************************************************
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*
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* Module Name: exfield - ACPI AML (p-code) execution - field manipulation
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* $Revision: 105 $
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*
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*****************************************************************************/
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/******************************************************************************
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*
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* 1. Copyright Notice
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*
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* Some or all of this work - Copyright (c) 1999 - 2002, Intel Corp.
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* All rights reserved.
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*
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* 2. License
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*
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* 2.1. This is your license from Intel Corp. under its intellectual property
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* rights. You may have additional license terms from the party that provided
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* you this software, covering your right to use that party's intellectual
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* property rights.
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*
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* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
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* copy of the source code appearing in this file ("Covered Code") an
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* irrevocable, perpetual, worldwide license under Intel's copyrights in the
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* base code distributed originally by Intel ("Original Intel Code") to copy,
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* make derivatives, distribute, use and display any portion of the Covered
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* Code in any form, with the right to sublicense such rights; and
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*
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* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
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* license (with the right to sublicense), under only those claims of Intel
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* patents that are infringed by the Original Intel Code, to make, use, sell,
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* offer to sell, and import the Covered Code and derivative works thereof
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* solely to the minimum extent necessary to exercise the above copyright
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* license, and in no event shall the patent license extend to any additions
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* to or modifications of the Original Intel Code. No other license or right
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* is granted directly or by implication, estoppel or otherwise;
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*
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* The above copyright and patent license is granted only if the following
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* conditions are met:
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*
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* 3. Conditions
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*
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* 3.1. Redistribution of Source with Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification with rights to further distribute source must include
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* the above Copyright Notice, the above License, this list of Conditions,
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* and the following Disclaimer and Export Compliance provision. In addition,
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* Licensee must cause all Covered Code to which Licensee contributes to
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* contain a file documenting the changes Licensee made to create that Covered
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* Code and the date of any change. Licensee must include in that file the
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* documentation of any changes made by any predecessor Licensee. Licensee
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* must include a prominent statement that the modification is derived,
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* directly or indirectly, from Original Intel Code.
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*
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* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification without rights to further distribute source must
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* include the following Disclaimer and Export Compliance provision in the
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* documentation and/or other materials provided with distribution. In
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* addition, Licensee may not authorize further sublicense of source of any
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* portion of the Covered Code, and must include terms to the effect that the
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* license from Licensee to its licensee is limited to the intellectual
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* property embodied in the software Licensee provides to its licensee, and
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* not to intellectual property embodied in modifications its licensee may
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* make.
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*
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* 3.3. Redistribution of Executable. Redistribution in executable form of any
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* substantial portion of the Covered Code or modification must reproduce the
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* above Copyright Notice, and the following Disclaimer and Export Compliance
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* provision in the documentation and/or other materials provided with the
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* distribution.
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*
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* 3.4. Intel retains all right, title, and interest in and to the Original
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* Intel Code.
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*
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* 3.5. Neither the name Intel nor any other trademark owned or controlled by
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* Intel shall be used in advertising or otherwise to promote the sale, use or
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* other dealings in products derived from or relating to the Covered Code
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* without prior written authorization from Intel.
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*
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* 4. Disclaimer and Export Compliance
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*
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* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
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* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
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* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
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* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
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* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
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* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
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* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
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* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
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* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
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* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
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* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
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* LIMITED REMEDY.
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*
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* 4.3. Licensee shall not export, either directly or indirectly, any of this
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* software or system incorporating such software without first obtaining any
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* required license or other approval from the U. S. Department of Commerce or
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* any other agency or department of the United States Government. In the
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* event Licensee exports any such software from the United States or
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* re-exports any such software from a foreign destination, Licensee shall
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* ensure that the distribution and export/re-export of the software is in
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* compliance with all laws, regulations, orders, or other restrictions of the
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* U.S. Export Administration Regulations. Licensee agrees that neither it nor
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* any of its subsidiaries will export/re-export any technical data, process,
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* software, or service, directly or indirectly, to any country for which the
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* United States government or any agency thereof requires an export license,
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* other governmental approval, or letter of assurance, without first obtaining
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* such license, approval or letter.
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*
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*****************************************************************************/
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#define __EXFIELD_C__
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#include "acpi.h"
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#include "acdispat.h"
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#include "acinterp.h"
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#include "amlcode.h"
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#include "acnamesp.h"
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#include "achware.h"
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#include "acevents.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME ("exfield")
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/*******************************************************************************
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*
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* FUNCTION: AcpiExReadDataFromField
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*
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* PARAMETERS: ObjDesc - The named field
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* RetBufferDesc - Where the return data object is stored
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read from a named field. Returns either an Integer or a
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* Buffer, depending on the size of the field.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExReadDataFromField (
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ACPI_OPERAND_OBJECT *ObjDesc,
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ACPI_OPERAND_OBJECT **RetBufferDesc)
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{
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ACPI_STATUS Status;
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ACPI_OPERAND_OBJECT *BufferDesc;
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UINT32 Length;
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void *Buffer;
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BOOLEAN Locked;
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ACPI_FUNCTION_TRACE_PTR ("ExReadDataFromField", ObjDesc);
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/* Parameter validation */
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if (!ObjDesc)
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{
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return_ACPI_STATUS (AE_AML_NO_OPERAND);
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}
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if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
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{
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/*
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* If the BufferField arguments have not been previously evaluated,
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* evaluate them now and save the results.
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*/
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if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
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{
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Status = AcpiDsGetBufferFieldArguments (ObjDesc);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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}
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}
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/*
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* Allocate a buffer for the contents of the field.
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*
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* If the field is larger than the size of an ACPI_INTEGER, create
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* a BUFFER to hold it. Otherwise, use an INTEGER. This allows
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* the use of arithmetic operators on the returned value if the
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* field size is equal or smaller than an Integer.
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*
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* Note: Field.length is in bits.
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*/
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Length = ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->Field.BitLength);
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if (Length > sizeof (ACPI_INTEGER))
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{
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/* Field is too large for an Integer, create a Buffer instead */
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BufferDesc = AcpiUtCreateInternalObject (ACPI_TYPE_BUFFER);
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if (!BufferDesc)
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{
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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/* Create the actual read buffer */
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BufferDesc->Buffer.Pointer = ACPI_MEM_CALLOCATE (Length);
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if (!BufferDesc->Buffer.Pointer)
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{
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AcpiUtRemoveReference (BufferDesc);
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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BufferDesc->Buffer.Length = Length;
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Buffer = BufferDesc->Buffer.Pointer;
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}
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else
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{
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/* Field will fit within an Integer (normal case) */
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BufferDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
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if (!BufferDesc)
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{
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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Length = sizeof (BufferDesc->Integer.Value);
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Buffer = &BufferDesc->Integer.Value;
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"Obj=%p Type=%X Buf=%p Len=%X\n",
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ObjDesc, ObjDesc->Common.Type, Buffer, Length));
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"FieldWrite: BitLen=%X BitOff=%X ByteOff=%X\n",
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ObjDesc->CommonField.BitLength,
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ObjDesc->CommonField.StartFieldBitOffset,
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ObjDesc->CommonField.BaseByteOffset));
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Locked = AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
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/* Read from the field */
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Status = AcpiExExtractFromField (ObjDesc, Buffer, Length);
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/*
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* Release global lock if we acquired it earlier
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*/
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AcpiExReleaseGlobalLock (Locked);
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if (ACPI_FAILURE (Status))
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{
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AcpiUtRemoveReference (BufferDesc);
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}
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else if (RetBufferDesc)
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{
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*RetBufferDesc = BufferDesc;
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}
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExWriteDataToField
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*
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* PARAMETERS: SourceDesc - Contains data to write
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* ObjDesc - The named field
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*
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* RETURN: Status
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*
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* DESCRIPTION: Write to a named field
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExWriteDataToField (
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ACPI_OPERAND_OBJECT *SourceDesc,
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ACPI_OPERAND_OBJECT *ObjDesc)
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{
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ACPI_STATUS Status;
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UINT32 Length;
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UINT32 RequiredLength;
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void *Buffer;
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void *NewBuffer;
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BOOLEAN Locked;
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ACPI_FUNCTION_TRACE_PTR ("ExWriteDataToField", ObjDesc);
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/* Parameter validation */
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if (!SourceDesc || !ObjDesc)
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{
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return_ACPI_STATUS (AE_AML_NO_OPERAND);
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}
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if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
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{
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/*
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* If the BufferField arguments have not been previously evaluated,
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* evaluate them now and save the results.
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*/
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if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
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{
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Status = AcpiDsGetBufferFieldArguments (ObjDesc);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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}
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}
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/*
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* Get a pointer to the data to be written
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*/
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switch (SourceDesc->Common.Type)
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{
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case ACPI_TYPE_INTEGER:
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Buffer = &SourceDesc->Integer.Value;
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Length = sizeof (SourceDesc->Integer.Value);
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break;
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case ACPI_TYPE_BUFFER:
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Buffer = SourceDesc->Buffer.Pointer;
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Length = SourceDesc->Buffer.Length;
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break;
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case ACPI_TYPE_STRING:
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Buffer = SourceDesc->String.Pointer;
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Length = SourceDesc->String.Length;
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break;
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default:
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
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}
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/*
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* We must have a buffer that is at least as long as the field
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* we are writing to. This is because individual fields are
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* indivisible and partial writes are not supported -- as per
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* the ACPI specification.
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*/
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NewBuffer = NULL;
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RequiredLength = ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength);
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if (Length < RequiredLength)
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{
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/* We need to create a new buffer */
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NewBuffer = ACPI_MEM_CALLOCATE (RequiredLength);
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if (!NewBuffer)
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{
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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/*
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* Copy the original data to the new buffer, starting
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* at Byte zero. All unused (upper) bytes of the
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* buffer will be 0.
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*/
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ACPI_MEMCPY ((char *) NewBuffer, (char *) Buffer, Length);
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Buffer = NewBuffer;
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Length = RequiredLength;
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"Obj=%p Type=%X Buf=%p Len=%X\n",
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ObjDesc, ObjDesc->Common.Type, Buffer, Length));
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"FieldRead: BitLen=%X BitOff=%X ByteOff=%X\n",
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ObjDesc->CommonField.BitLength,
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ObjDesc->CommonField.StartFieldBitOffset,
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ObjDesc->CommonField.BaseByteOffset));
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Locked = AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
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/*
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* Write to the field
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*/
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Status = AcpiExInsertIntoField (ObjDesc, Buffer, Length);
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/*
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* Release global lock if we acquired it earlier
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*/
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AcpiExReleaseGlobalLock (Locked);
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/* Free temporary buffer if we used one */
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if (NewBuffer)
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{
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ACPI_MEM_FREE (NewBuffer);
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}
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return_ACPI_STATUS (Status);
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}
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