1082 lines
36 KiB
C
1082 lines
36 KiB
C
/******************************************************************************
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*
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* Module Name: exfldio - Aml Field I/O
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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 - 2009, 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 __EXFLDIO_C__
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#include <contrib/dev/acpica/include/acpi.h>
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#include <contrib/dev/acpica/include/accommon.h>
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#include <contrib/dev/acpica/include/acinterp.h>
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#include <contrib/dev/acpica/include/amlcode.h>
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#include <contrib/dev/acpica/include/acevents.h>
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#include <contrib/dev/acpica/include/acdispat.h>
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME ("exfldio")
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/* Local prototypes */
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static ACPI_STATUS
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AcpiExFieldDatumIo (
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ACPI_OPERAND_OBJECT *ObjDesc,
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UINT32 FieldDatumByteOffset,
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ACPI_INTEGER *Value,
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UINT32 ReadWrite);
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static BOOLEAN
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AcpiExRegisterOverflow (
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ACPI_OPERAND_OBJECT *ObjDesc,
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ACPI_INTEGER Value);
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static ACPI_STATUS
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AcpiExSetupRegion (
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ACPI_OPERAND_OBJECT *ObjDesc,
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UINT32 FieldDatumByteOffset);
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/*******************************************************************************
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*
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* FUNCTION: AcpiExSetupRegion
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*
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* PARAMETERS: ObjDesc - Field to be read or written
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* FieldDatumByteOffset - Byte offset of this datum within the
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* parent field
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*
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* RETURN: Status
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*
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* DESCRIPTION: Common processing for AcpiExExtractFromField and
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* AcpiExInsertIntoField. Initialize the Region if necessary and
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* validate the request.
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiExSetupRegion (
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ACPI_OPERAND_OBJECT *ObjDesc,
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UINT32 FieldDatumByteOffset)
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{
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ACPI_STATUS Status = AE_OK;
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ACPI_OPERAND_OBJECT *RgnDesc;
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ACPI_FUNCTION_TRACE_U32 (ExSetupRegion, FieldDatumByteOffset);
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RgnDesc = ObjDesc->CommonField.RegionObj;
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/* We must have a valid region */
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if (RgnDesc->Common.Type != ACPI_TYPE_REGION)
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{
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ACPI_ERROR ((AE_INFO, "Needed Region, found type %X (%s)",
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RgnDesc->Common.Type,
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AcpiUtGetObjectTypeName (RgnDesc)));
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
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}
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/*
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* If the Region Address and Length 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 (!(RgnDesc->Common.Flags & AOPOBJ_DATA_VALID))
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{
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Status = AcpiDsGetRegionArguments (RgnDesc);
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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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* Exit now for SMBus or IPMI address space, it has a non-linear address space
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* and the request cannot be directly validated
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*/
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if (RgnDesc->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
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RgnDesc->Region.SpaceId == ACPI_ADR_SPACE_IPMI)
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{
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/* SMBus or IPMI has a non-linear address space */
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return_ACPI_STATUS (AE_OK);
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}
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#ifdef ACPI_UNDER_DEVELOPMENT
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/*
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* If the Field access is AnyAcc, we can now compute the optimal
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* access (because we know know the length of the parent region)
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*/
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if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
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{
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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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#endif
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/*
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* Validate the request. The entire request from the byte offset for a
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* length of one field datum (access width) must fit within the region.
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* (Region length is specified in bytes)
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*/
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if (RgnDesc->Region.Length <
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(ObjDesc->CommonField.BaseByteOffset +
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FieldDatumByteOffset +
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ObjDesc->CommonField.AccessByteWidth))
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{
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if (AcpiGbl_EnableInterpreterSlack)
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{
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/*
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* Slack mode only: We will go ahead and allow access to this
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* field if it is within the region length rounded up to the next
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* access width boundary. ACPI_SIZE cast for 64-bit compile.
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*/
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if (ACPI_ROUND_UP (RgnDesc->Region.Length,
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ObjDesc->CommonField.AccessByteWidth) >=
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((ACPI_SIZE) ObjDesc->CommonField.BaseByteOffset +
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ObjDesc->CommonField.AccessByteWidth +
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FieldDatumByteOffset))
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{
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return_ACPI_STATUS (AE_OK);
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}
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}
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if (RgnDesc->Region.Length < ObjDesc->CommonField.AccessByteWidth)
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{
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/*
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* This is the case where the AccessType (AccWord, etc.) is wider
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* than the region itself. For example, a region of length one
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* byte, and a field with Dword access specified.
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*/
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ACPI_ERROR ((AE_INFO,
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"Field [%4.4s] access width (%d bytes) too large for region [%4.4s] (length %X)",
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AcpiUtGetNodeName (ObjDesc->CommonField.Node),
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ObjDesc->CommonField.AccessByteWidth,
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AcpiUtGetNodeName (RgnDesc->Region.Node),
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RgnDesc->Region.Length));
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}
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/*
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* Offset rounded up to next multiple of field width
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* exceeds region length, indicate an error
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*/
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ACPI_ERROR ((AE_INFO,
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"Field [%4.4s] Base+Offset+Width %X+%X+%X is beyond end of region [%4.4s] (length %X)",
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AcpiUtGetNodeName (ObjDesc->CommonField.Node),
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ObjDesc->CommonField.BaseByteOffset,
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FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth,
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AcpiUtGetNodeName (RgnDesc->Region.Node),
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RgnDesc->Region.Length));
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return_ACPI_STATUS (AE_AML_REGION_LIMIT);
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}
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExAccessRegion
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*
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* PARAMETERS: ObjDesc - Field to be read
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* FieldDatumByteOffset - Byte offset of this datum within the
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* parent field
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* Value - Where to store value (must at least
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* the size of ACPI_INTEGER)
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* Function - Read or Write flag plus other region-
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* dependent flags
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read or Write a single field datum to an Operation Region.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExAccessRegion (
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ACPI_OPERAND_OBJECT *ObjDesc,
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UINT32 FieldDatumByteOffset,
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ACPI_INTEGER *Value,
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UINT32 Function)
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{
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ACPI_STATUS Status;
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ACPI_OPERAND_OBJECT *RgnDesc;
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UINT32 RegionOffset;
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ACPI_FUNCTION_TRACE (ExAccessRegion);
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/*
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* Ensure that the region operands are fully evaluated and verify
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* the validity of the request
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*/
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Status = AcpiExSetupRegion (ObjDesc, FieldDatumByteOffset);
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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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* The physical address of this field datum is:
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*
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* 1) The base of the region, plus
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* 2) The base offset of the field, plus
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* 3) The current offset into the field
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*/
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RgnDesc = ObjDesc->CommonField.RegionObj;
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RegionOffset =
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ObjDesc->CommonField.BaseByteOffset +
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FieldDatumByteOffset;
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if ((Function & ACPI_IO_MASK) == ACPI_READ)
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[READ]"));
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}
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else
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[WRITE]"));
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}
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ACPI_DEBUG_PRINT_RAW ((ACPI_DB_BFIELD,
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" Region [%s:%X], Width %X, ByteBase %X, Offset %X at %p\n",
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AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
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RgnDesc->Region.SpaceId,
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ObjDesc->CommonField.AccessByteWidth,
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ObjDesc->CommonField.BaseByteOffset,
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FieldDatumByteOffset,
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ACPI_CAST_PTR (void, (RgnDesc->Region.Address + RegionOffset))));
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/* Invoke the appropriate AddressSpace/OpRegion handler */
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Status = AcpiEvAddressSpaceDispatch (RgnDesc, Function, RegionOffset,
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ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth), Value);
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if (ACPI_FAILURE (Status))
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{
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if (Status == AE_NOT_IMPLEMENTED)
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{
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ACPI_ERROR ((AE_INFO,
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"Region %s(%X) not implemented",
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AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
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RgnDesc->Region.SpaceId));
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}
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else if (Status == AE_NOT_EXIST)
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{
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ACPI_ERROR ((AE_INFO,
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"Region %s(%X) has no handler",
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AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
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RgnDesc->Region.SpaceId));
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}
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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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* FUNCTION: AcpiExRegisterOverflow
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*
|
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* PARAMETERS: ObjDesc - Register(Field) to be written
|
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* Value - Value to be stored
|
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*
|
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* RETURN: TRUE if value overflows the field, FALSE otherwise
|
|
*
|
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* DESCRIPTION: Check if a value is out of range of the field being written.
|
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* Used to check if the values written to Index and Bank registers
|
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* are out of range. Normally, the value is simply truncated
|
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* to fit the field, but this case is most likely a serious
|
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* coding error in the ASL.
|
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*
|
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******************************************************************************/
|
|
|
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static BOOLEAN
|
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AcpiExRegisterOverflow (
|
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ACPI_OPERAND_OBJECT *ObjDesc,
|
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ACPI_INTEGER Value)
|
|
{
|
|
|
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if (ObjDesc->CommonField.BitLength >= ACPI_INTEGER_BIT_SIZE)
|
|
{
|
|
/*
|
|
* The field is large enough to hold the maximum integer, so we can
|
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* never overflow it.
|
|
*/
|
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return (FALSE);
|
|
}
|
|
|
|
if (Value >= ((ACPI_INTEGER) 1 << ObjDesc->CommonField.BitLength))
|
|
{
|
|
/*
|
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* The Value is larger than the maximum value that can fit into
|
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* the register.
|
|
*/
|
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return (TRUE);
|
|
}
|
|
|
|
/* The Value will fit into the field with no truncation */
|
|
|
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return (FALSE);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiExFieldDatumIo
|
|
*
|
|
* PARAMETERS: ObjDesc - Field to be read
|
|
* FieldDatumByteOffset - Byte offset of this datum within the
|
|
* parent field
|
|
* Value - Where to store value (must be 64 bits)
|
|
* ReadWrite - Read or Write flag
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Read or Write a single datum of a field. The FieldType is
|
|
* demultiplexed here to handle the different types of fields
|
|
* (BufferField, RegionField, IndexField, BankField)
|
|
*
|
|
******************************************************************************/
|
|
|
|
static ACPI_STATUS
|
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AcpiExFieldDatumIo (
|
|
ACPI_OPERAND_OBJECT *ObjDesc,
|
|
UINT32 FieldDatumByteOffset,
|
|
ACPI_INTEGER *Value,
|
|
UINT32 ReadWrite)
|
|
{
|
|
ACPI_STATUS Status;
|
|
ACPI_INTEGER LocalValue;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE_U32 (ExFieldDatumIo, FieldDatumByteOffset);
|
|
|
|
|
|
if (ReadWrite == ACPI_READ)
|
|
{
|
|
if (!Value)
|
|
{
|
|
LocalValue = 0;
|
|
|
|
/* To support reads without saving return value */
|
|
Value = &LocalValue;
|
|
}
|
|
|
|
/* Clear the entire return buffer first, [Very Important!] */
|
|
|
|
*Value = 0;
|
|
}
|
|
|
|
/*
|
|
* The four types of fields are:
|
|
*
|
|
* BufferField - Read/write from/to a Buffer
|
|
* RegionField - Read/write from/to a Operation Region.
|
|
* BankField - Write to a Bank Register, then read/write from/to an
|
|
* OperationRegion
|
|
* IndexField - Write to an Index Register, then read/write from/to a
|
|
* Data Register
|
|
*/
|
|
switch (ObjDesc->Common.Type)
|
|
{
|
|
case ACPI_TYPE_BUFFER_FIELD:
|
|
/*
|
|
* If the BufferField arguments have not been previously evaluated,
|
|
* evaluate them now and save the results.
|
|
*/
|
|
if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
|
|
{
|
|
Status = AcpiDsGetBufferFieldArguments (ObjDesc);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
}
|
|
|
|
if (ReadWrite == ACPI_READ)
|
|
{
|
|
/*
|
|
* Copy the data from the source buffer.
|
|
* Length is the field width in bytes.
|
|
*/
|
|
ACPI_MEMCPY (Value,
|
|
(ObjDesc->BufferField.BufferObj)->Buffer.Pointer +
|
|
ObjDesc->BufferField.BaseByteOffset +
|
|
FieldDatumByteOffset,
|
|
ObjDesc->CommonField.AccessByteWidth);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Copy the data to the target buffer.
|
|
* Length is the field width in bytes.
|
|
*/
|
|
ACPI_MEMCPY ((ObjDesc->BufferField.BufferObj)->Buffer.Pointer +
|
|
ObjDesc->BufferField.BaseByteOffset +
|
|
FieldDatumByteOffset,
|
|
Value, ObjDesc->CommonField.AccessByteWidth);
|
|
}
|
|
|
|
Status = AE_OK;
|
|
break;
|
|
|
|
|
|
case ACPI_TYPE_LOCAL_BANK_FIELD:
|
|
|
|
/*
|
|
* Ensure that the BankValue is not beyond the capacity of
|
|
* the register
|
|
*/
|
|
if (AcpiExRegisterOverflow (ObjDesc->BankField.BankObj,
|
|
(ACPI_INTEGER) ObjDesc->BankField.Value))
|
|
{
|
|
return_ACPI_STATUS (AE_AML_REGISTER_LIMIT);
|
|
}
|
|
|
|
/*
|
|
* For BankFields, we must write the BankValue to the BankRegister
|
|
* (itself a RegionField) before we can access the data.
|
|
*/
|
|
Status = AcpiExInsertIntoField (ObjDesc->BankField.BankObj,
|
|
&ObjDesc->BankField.Value,
|
|
sizeof (ObjDesc->BankField.Value));
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
/*
|
|
* Now that the Bank has been selected, fall through to the
|
|
* RegionField case and write the datum to the Operation Region
|
|
*/
|
|
|
|
/*lint -fallthrough */
|
|
|
|
|
|
case ACPI_TYPE_LOCAL_REGION_FIELD:
|
|
/*
|
|
* For simple RegionFields, we just directly access the owning
|
|
* Operation Region.
|
|
*/
|
|
Status = AcpiExAccessRegion (ObjDesc, FieldDatumByteOffset, Value,
|
|
ReadWrite);
|
|
break;
|
|
|
|
|
|
case ACPI_TYPE_LOCAL_INDEX_FIELD:
|
|
|
|
|
|
/*
|
|
* Ensure that the IndexValue is not beyond the capacity of
|
|
* the register
|
|
*/
|
|
if (AcpiExRegisterOverflow (ObjDesc->IndexField.IndexObj,
|
|
(ACPI_INTEGER) ObjDesc->IndexField.Value))
|
|
{
|
|
return_ACPI_STATUS (AE_AML_REGISTER_LIMIT);
|
|
}
|
|
|
|
/* Write the index value to the IndexRegister (itself a RegionField) */
|
|
|
|
FieldDatumByteOffset += ObjDesc->IndexField.Value;
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
|
|
"Write to Index Register: Value %8.8X\n",
|
|
FieldDatumByteOffset));
|
|
|
|
Status = AcpiExInsertIntoField (ObjDesc->IndexField.IndexObj,
|
|
&FieldDatumByteOffset,
|
|
sizeof (FieldDatumByteOffset));
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
if (ReadWrite == ACPI_READ)
|
|
{
|
|
/* Read the datum from the DataRegister */
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
|
|
"Read from Data Register\n"));
|
|
|
|
Status = AcpiExExtractFromField (ObjDesc->IndexField.DataObj,
|
|
Value, sizeof (ACPI_INTEGER));
|
|
}
|
|
else
|
|
{
|
|
/* Write the datum to the DataRegister */
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
|
|
"Write to Data Register: Value %8.8X%8.8X\n",
|
|
ACPI_FORMAT_UINT64 (*Value)));
|
|
|
|
Status = AcpiExInsertIntoField (ObjDesc->IndexField.DataObj,
|
|
Value, sizeof (ACPI_INTEGER));
|
|
}
|
|
break;
|
|
|
|
|
|
default:
|
|
|
|
ACPI_ERROR ((AE_INFO, "Wrong object type in field I/O %X",
|
|
ObjDesc->Common.Type));
|
|
Status = AE_AML_INTERNAL;
|
|
break;
|
|
}
|
|
|
|
if (ACPI_SUCCESS (Status))
|
|
{
|
|
if (ReadWrite == ACPI_READ)
|
|
{
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
|
|
"Value Read %8.8X%8.8X, Width %d\n",
|
|
ACPI_FORMAT_UINT64 (*Value),
|
|
ObjDesc->CommonField.AccessByteWidth));
|
|
}
|
|
else
|
|
{
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
|
|
"Value Written %8.8X%8.8X, Width %d\n",
|
|
ACPI_FORMAT_UINT64 (*Value),
|
|
ObjDesc->CommonField.AccessByteWidth));
|
|
}
|
|
}
|
|
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiExWriteWithUpdateRule
|
|
*
|
|
* PARAMETERS: ObjDesc - Field to be written
|
|
* Mask - bitmask within field datum
|
|
* FieldValue - Value to write
|
|
* FieldDatumByteOffset - Offset of datum within field
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Apply the field update rule to a field write
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiExWriteWithUpdateRule (
|
|
ACPI_OPERAND_OBJECT *ObjDesc,
|
|
ACPI_INTEGER Mask,
|
|
ACPI_INTEGER FieldValue,
|
|
UINT32 FieldDatumByteOffset)
|
|
{
|
|
ACPI_STATUS Status = AE_OK;
|
|
ACPI_INTEGER MergedValue;
|
|
ACPI_INTEGER CurrentValue;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE_U32 (ExWriteWithUpdateRule, Mask);
|
|
|
|
|
|
/* Start with the new bits */
|
|
|
|
MergedValue = FieldValue;
|
|
|
|
/* If the mask is all ones, we don't need to worry about the update rule */
|
|
|
|
if (Mask != ACPI_INTEGER_MAX)
|
|
{
|
|
/* Decode the update rule */
|
|
|
|
switch (ObjDesc->CommonField.FieldFlags & AML_FIELD_UPDATE_RULE_MASK)
|
|
{
|
|
case AML_FIELD_UPDATE_PRESERVE:
|
|
/*
|
|
* Check if update rule needs to be applied (not if mask is all
|
|
* ones) The left shift drops the bits we want to ignore.
|
|
*/
|
|
if ((~Mask << (ACPI_MUL_8 (sizeof (Mask)) -
|
|
ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth))) != 0)
|
|
{
|
|
/*
|
|
* Read the current contents of the byte/word/dword containing
|
|
* the field, and merge with the new field value.
|
|
*/
|
|
Status = AcpiExFieldDatumIo (ObjDesc, FieldDatumByteOffset,
|
|
&CurrentValue, ACPI_READ);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
MergedValue |= (CurrentValue & ~Mask);
|
|
}
|
|
break;
|
|
|
|
case AML_FIELD_UPDATE_WRITE_AS_ONES:
|
|
|
|
/* Set positions outside the field to all ones */
|
|
|
|
MergedValue |= ~Mask;
|
|
break;
|
|
|
|
case AML_FIELD_UPDATE_WRITE_AS_ZEROS:
|
|
|
|
/* Set positions outside the field to all zeros */
|
|
|
|
MergedValue &= Mask;
|
|
break;
|
|
|
|
default:
|
|
|
|
ACPI_ERROR ((AE_INFO,
|
|
"Unknown UpdateRule value: %X",
|
|
(ObjDesc->CommonField.FieldFlags & AML_FIELD_UPDATE_RULE_MASK)));
|
|
return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
|
|
}
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
|
|
"Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n",
|
|
ACPI_FORMAT_UINT64 (Mask),
|
|
FieldDatumByteOffset,
|
|
ObjDesc->CommonField.AccessByteWidth,
|
|
ACPI_FORMAT_UINT64 (FieldValue),
|
|
ACPI_FORMAT_UINT64 (MergedValue)));
|
|
|
|
/* Write the merged value */
|
|
|
|
Status = AcpiExFieldDatumIo (ObjDesc, FieldDatumByteOffset,
|
|
&MergedValue, ACPI_WRITE);
|
|
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiExExtractFromField
|
|
*
|
|
* PARAMETERS: ObjDesc - Field to be read
|
|
* Buffer - Where to store the field data
|
|
* BufferLength - Length of Buffer
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Retrieve the current value of the given field
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiExExtractFromField (
|
|
ACPI_OPERAND_OBJECT *ObjDesc,
|
|
void *Buffer,
|
|
UINT32 BufferLength)
|
|
{
|
|
ACPI_STATUS Status;
|
|
ACPI_INTEGER RawDatum;
|
|
ACPI_INTEGER MergedDatum;
|
|
UINT32 FieldOffset = 0;
|
|
UINT32 BufferOffset = 0;
|
|
UINT32 BufferTailBits;
|
|
UINT32 DatumCount;
|
|
UINT32 FieldDatumCount;
|
|
UINT32 i;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE (ExExtractFromField);
|
|
|
|
|
|
/* Validate target buffer and clear it */
|
|
|
|
if (BufferLength <
|
|
ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength))
|
|
{
|
|
ACPI_ERROR ((AE_INFO,
|
|
"Field size %X (bits) is too large for buffer (%X)",
|
|
ObjDesc->CommonField.BitLength, BufferLength));
|
|
|
|
return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
|
|
}
|
|
ACPI_MEMSET (Buffer, 0, BufferLength);
|
|
|
|
/* Compute the number of datums (access width data items) */
|
|
|
|
DatumCount = ACPI_ROUND_UP_TO (
|
|
ObjDesc->CommonField.BitLength,
|
|
ObjDesc->CommonField.AccessBitWidth);
|
|
FieldDatumCount = ACPI_ROUND_UP_TO (
|
|
ObjDesc->CommonField.BitLength +
|
|
ObjDesc->CommonField.StartFieldBitOffset,
|
|
ObjDesc->CommonField.AccessBitWidth);
|
|
|
|
/* Priming read from the field */
|
|
|
|
Status = AcpiExFieldDatumIo (ObjDesc, FieldOffset, &RawDatum, ACPI_READ);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset;
|
|
|
|
/* Read the rest of the field */
|
|
|
|
for (i = 1; i < FieldDatumCount; i++)
|
|
{
|
|
/* Get next input datum from the field */
|
|
|
|
FieldOffset += ObjDesc->CommonField.AccessByteWidth;
|
|
Status = AcpiExFieldDatumIo (ObjDesc, FieldOffset,
|
|
&RawDatum, ACPI_READ);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
/*
|
|
* Merge with previous datum if necessary.
|
|
*
|
|
* Note: Before the shift, check if the shift value will be larger than
|
|
* the integer size. If so, there is no need to perform the operation.
|
|
* This avoids the differences in behavior between different compilers
|
|
* concerning shift values larger than the target data width.
|
|
*/
|
|
if ((ObjDesc->CommonField.AccessBitWidth -
|
|
ObjDesc->CommonField.StartFieldBitOffset) < ACPI_INTEGER_BIT_SIZE)
|
|
{
|
|
MergedDatum |= RawDatum <<
|
|
(ObjDesc->CommonField.AccessBitWidth -
|
|
ObjDesc->CommonField.StartFieldBitOffset);
|
|
}
|
|
|
|
if (i == DatumCount)
|
|
{
|
|
break;
|
|
}
|
|
|
|
/* Write merged datum to target buffer */
|
|
|
|
ACPI_MEMCPY (((char *) Buffer) + BufferOffset, &MergedDatum,
|
|
ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
|
|
BufferLength - BufferOffset));
|
|
|
|
BufferOffset += ObjDesc->CommonField.AccessByteWidth;
|
|
MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset;
|
|
}
|
|
|
|
/* Mask off any extra bits in the last datum */
|
|
|
|
BufferTailBits = ObjDesc->CommonField.BitLength %
|
|
ObjDesc->CommonField.AccessBitWidth;
|
|
if (BufferTailBits)
|
|
{
|
|
MergedDatum &= ACPI_MASK_BITS_ABOVE (BufferTailBits);
|
|
}
|
|
|
|
/* Write the last datum to the buffer */
|
|
|
|
ACPI_MEMCPY (((char *) Buffer) + BufferOffset, &MergedDatum,
|
|
ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
|
|
BufferLength - BufferOffset));
|
|
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiExInsertIntoField
|
|
*
|
|
* PARAMETERS: ObjDesc - Field to be written
|
|
* Buffer - Data to be written
|
|
* BufferLength - Length of Buffer
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Store the Buffer contents into the given field
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiExInsertIntoField (
|
|
ACPI_OPERAND_OBJECT *ObjDesc,
|
|
void *Buffer,
|
|
UINT32 BufferLength)
|
|
{
|
|
ACPI_STATUS Status;
|
|
ACPI_INTEGER Mask;
|
|
ACPI_INTEGER WidthMask;
|
|
ACPI_INTEGER MergedDatum;
|
|
ACPI_INTEGER RawDatum = 0;
|
|
UINT32 FieldOffset = 0;
|
|
UINT32 BufferOffset = 0;
|
|
UINT32 BufferTailBits;
|
|
UINT32 DatumCount;
|
|
UINT32 FieldDatumCount;
|
|
UINT32 i;
|
|
UINT32 RequiredLength;
|
|
void *NewBuffer;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE (ExInsertIntoField);
|
|
|
|
|
|
/* Validate input buffer */
|
|
|
|
NewBuffer = NULL;
|
|
RequiredLength = ACPI_ROUND_BITS_UP_TO_BYTES (
|
|
ObjDesc->CommonField.BitLength);
|
|
/*
|
|
* 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 (BufferLength < RequiredLength)
|
|
{
|
|
/* We need to create a new buffer */
|
|
|
|
NewBuffer = ACPI_ALLOCATE_ZEROED (RequiredLength);
|
|
if (!NewBuffer)
|
|
{
|
|
return_ACPI_STATUS (AE_NO_MEMORY);
|
|
}
|
|
|
|
/*
|
|
* Copy the original data to the new buffer, starting
|
|
* at Byte zero. All unused (upper) bytes of the
|
|
* buffer will be 0.
|
|
*/
|
|
ACPI_MEMCPY ((char *) NewBuffer, (char *) Buffer, BufferLength);
|
|
Buffer = NewBuffer;
|
|
BufferLength = RequiredLength;
|
|
}
|
|
|
|
/*
|
|
* Create the bitmasks used for bit insertion.
|
|
* Note: This if/else is used to bypass compiler differences with the
|
|
* shift operator
|
|
*/
|
|
if (ObjDesc->CommonField.AccessBitWidth == ACPI_INTEGER_BIT_SIZE)
|
|
{
|
|
WidthMask = ACPI_INTEGER_MAX;
|
|
}
|
|
else
|
|
{
|
|
WidthMask = ACPI_MASK_BITS_ABOVE (ObjDesc->CommonField.AccessBitWidth);
|
|
}
|
|
|
|
Mask = WidthMask &
|
|
ACPI_MASK_BITS_BELOW (ObjDesc->CommonField.StartFieldBitOffset);
|
|
|
|
/* Compute the number of datums (access width data items) */
|
|
|
|
DatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength,
|
|
ObjDesc->CommonField.AccessBitWidth);
|
|
|
|
FieldDatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength +
|
|
ObjDesc->CommonField.StartFieldBitOffset,
|
|
ObjDesc->CommonField.AccessBitWidth);
|
|
|
|
/* Get initial Datum from the input buffer */
|
|
|
|
ACPI_MEMCPY (&RawDatum, Buffer,
|
|
ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
|
|
BufferLength - BufferOffset));
|
|
|
|
MergedDatum = RawDatum << ObjDesc->CommonField.StartFieldBitOffset;
|
|
|
|
/* Write the entire field */
|
|
|
|
for (i = 1; i < FieldDatumCount; i++)
|
|
{
|
|
/* Write merged datum to the target field */
|
|
|
|
MergedDatum &= Mask;
|
|
Status = AcpiExWriteWithUpdateRule (ObjDesc, Mask,
|
|
MergedDatum, FieldOffset);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
goto Exit;
|
|
}
|
|
|
|
FieldOffset += ObjDesc->CommonField.AccessByteWidth;
|
|
|
|
/*
|
|
* Start new output datum by merging with previous input datum
|
|
* if necessary.
|
|
*
|
|
* Note: Before the shift, check if the shift value will be larger than
|
|
* the integer size. If so, there is no need to perform the operation.
|
|
* This avoids the differences in behavior between different compilers
|
|
* concerning shift values larger than the target data width.
|
|
*/
|
|
if ((ObjDesc->CommonField.AccessBitWidth -
|
|
ObjDesc->CommonField.StartFieldBitOffset) < ACPI_INTEGER_BIT_SIZE)
|
|
{
|
|
MergedDatum = RawDatum >>
|
|
(ObjDesc->CommonField.AccessBitWidth -
|
|
ObjDesc->CommonField.StartFieldBitOffset);
|
|
}
|
|
else
|
|
{
|
|
MergedDatum = 0;
|
|
}
|
|
|
|
Mask = WidthMask;
|
|
|
|
if (i == DatumCount)
|
|
{
|
|
break;
|
|
}
|
|
|
|
/* Get the next input datum from the buffer */
|
|
|
|
BufferOffset += ObjDesc->CommonField.AccessByteWidth;
|
|
ACPI_MEMCPY (&RawDatum, ((char *) Buffer) + BufferOffset,
|
|
ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
|
|
BufferLength - BufferOffset));
|
|
MergedDatum |= RawDatum << ObjDesc->CommonField.StartFieldBitOffset;
|
|
}
|
|
|
|
/* Mask off any extra bits in the last datum */
|
|
|
|
BufferTailBits = (ObjDesc->CommonField.BitLength +
|
|
ObjDesc->CommonField.StartFieldBitOffset) %
|
|
ObjDesc->CommonField.AccessBitWidth;
|
|
if (BufferTailBits)
|
|
{
|
|
Mask &= ACPI_MASK_BITS_ABOVE (BufferTailBits);
|
|
}
|
|
|
|
/* Write the last datum to the field */
|
|
|
|
MergedDatum &= Mask;
|
|
Status = AcpiExWriteWithUpdateRule (ObjDesc,
|
|
Mask, MergedDatum, FieldOffset);
|
|
|
|
Exit:
|
|
/* Free temporary buffer if we used one */
|
|
|
|
if (NewBuffer)
|
|
{
|
|
ACPI_FREE (NewBuffer);
|
|
}
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
|