NetBSD-5.0.2/sys/dist/acpica/exprep.c
/******************************************************************************
*
* Module Name: exprep - ACPI AML (p-code) execution - field prep utilities
* $Revision: 1.4 $
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2008, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#define __EXPREP_C__
#include "acpi.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exprep")
/* Local prototypes */
static UINT32
AcpiExDecodeFieldAccess (
ACPI_OPERAND_OBJECT *ObjDesc,
UINT8 FieldFlags,
UINT32 *ReturnByteAlignment);
#ifdef ACPI_UNDER_DEVELOPMENT
static UINT32
AcpiExGenerateAccess (
UINT32 FieldBitOffset,
UINT32 FieldBitLength,
UINT32 RegionLength);
/*******************************************************************************
*
* FUNCTION: AcpiExGenerateAccess
*
* PARAMETERS: FieldBitOffset - Start of field within parent region/buffer
* FieldBitLength - Length of field in bits
* RegionLength - Length of parent in bytes
*
* RETURN: Field granularity (8, 16, 32 or 64) and
* ByteAlignment (1, 2, 3, or 4)
*
* DESCRIPTION: Generate an optimal access width for fields defined with the
* AnyAcc keyword.
*
* NOTE: Need to have the RegionLength in order to check for boundary
* conditions (end-of-region). However, the RegionLength is a deferred
* operation. Therefore, to complete this implementation, the generation
* of this access width must be deferred until the region length has
* been evaluated.
*
******************************************************************************/
static UINT32
AcpiExGenerateAccess (
UINT32 FieldBitOffset,
UINT32 FieldBitLength,
UINT32 RegionLength)
{
UINT32 FieldByteLength;
UINT32 FieldByteOffset;
UINT32 FieldByteEndOffset;
UINT32 AccessByteWidth;
UINT32 FieldStartOffset;
UINT32 FieldEndOffset;
UINT32 MinimumAccessWidth = 0xFFFFFFFF;
UINT32 MinimumAccesses = 0xFFFFFFFF;
UINT32 Accesses;
ACPI_FUNCTION_TRACE (ExGenerateAccess);
/* Round Field start offset and length to "minimal" byte boundaries */
FieldByteOffset = ACPI_DIV_8 (ACPI_ROUND_DOWN (FieldBitOffset, 8));
FieldByteEndOffset = ACPI_DIV_8 (ACPI_ROUND_UP (FieldBitLength +
FieldBitOffset, 8));
FieldByteLength = FieldByteEndOffset - FieldByteOffset;
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Bit length %d, Bit offset %d\n",
FieldBitLength, FieldBitOffset));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Byte Length %d, Byte Offset %d, End Offset %d\n",
FieldByteLength, FieldByteOffset, FieldByteEndOffset));
/*
* Iterative search for the maximum access width that is both aligned
* and does not go beyond the end of the region
*
* Start at ByteAcc and work upwards to QwordAcc max. (1,2,4,8 bytes)
*/
for (AccessByteWidth = 1; AccessByteWidth <= 8; AccessByteWidth <<= 1)
{
/*
* 1) Round end offset up to next access boundary and make sure that
* this does not go beyond the end of the parent region.
* 2) When the Access width is greater than the FieldByteLength, we
* are done. (This does not optimize for the perfectly aligned
* case yet).
*/
if (ACPI_ROUND_UP (FieldByteEndOffset, AccessByteWidth) <= RegionLength)
{
FieldStartOffset =
ACPI_ROUND_DOWN (FieldByteOffset, AccessByteWidth) /
AccessByteWidth;
FieldEndOffset =
ACPI_ROUND_UP ((FieldByteLength + FieldByteOffset),
AccessByteWidth) / AccessByteWidth;
Accesses = FieldEndOffset - FieldStartOffset;
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"AccessWidth %d end is within region\n", AccessByteWidth));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Field Start %d, Field End %d -- requires %d accesses\n",
FieldStartOffset, FieldEndOffset, Accesses));
/* Single access is optimal */
if (Accesses <= 1)
{
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Entire field can be accessed with one operation of size %d\n",
AccessByteWidth));
return_VALUE (AccessByteWidth);
}
/*
* Fits in the region, but requires more than one read/write.
* try the next wider access on next iteration
*/
if (Accesses < MinimumAccesses)
{
MinimumAccesses = Accesses;
MinimumAccessWidth = AccessByteWidth;
}
}
else
{
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"AccessWidth %d end is NOT within region\n", AccessByteWidth));
if (AccessByteWidth == 1)
{
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Field goes beyond end-of-region!\n"));
/* Field does not fit in the region at all */
return_VALUE (0);
}
/*
* This width goes beyond the end-of-region, back off to
* previous access
*/
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Backing off to previous optimal access width of %d\n",
MinimumAccessWidth));
return_VALUE (MinimumAccessWidth);
}
}
/*
* Could not read/write field with one operation,
* just use max access width
*/
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Cannot access field in one operation, using width 8\n"));
return_VALUE (8);
}
#endif /* ACPI_UNDER_DEVELOPMENT */
/*******************************************************************************
*
* FUNCTION: AcpiExDecodeFieldAccess
*
* PARAMETERS: ObjDesc - Field object
* FieldFlags - Encoded fieldflags (contains access bits)
* ReturnByteAlignment - Where the byte alignment is returned
*
* RETURN: Field granularity (8, 16, 32 or 64) and
* ByteAlignment (1, 2, 3, or 4)
*
* DESCRIPTION: Decode the AccessType bits of a field definition.
*
******************************************************************************/
static UINT32
AcpiExDecodeFieldAccess (
ACPI_OPERAND_OBJECT *ObjDesc,
UINT8 FieldFlags,
UINT32 *ReturnByteAlignment)
{
UINT32 Access;
UINT32 ByteAlignment;
UINT32 BitLength;
ACPI_FUNCTION_TRACE (ExDecodeFieldAccess);
Access = (FieldFlags & AML_FIELD_ACCESS_TYPE_MASK);
switch (Access)
{
case AML_FIELD_ACCESS_ANY:
#ifdef ACPI_UNDER_DEVELOPMENT
ByteAlignment =
AcpiExGenerateAccess (ObjDesc->CommonField.StartFieldBitOffset,
ObjDesc->CommonField.BitLength,
0xFFFFFFFF /* Temp until we pass RegionLength as parameter */);
BitLength = ByteAlignment * 8;
#endif
ByteAlignment = 1;
BitLength = 8;
break;
case AML_FIELD_ACCESS_BYTE:
case AML_FIELD_ACCESS_BUFFER: /* ACPI 2.0 (SMBus Buffer) */
ByteAlignment = 1;
BitLength = 8;
break;
case AML_FIELD_ACCESS_WORD:
ByteAlignment = 2;
BitLength = 16;
break;
case AML_FIELD_ACCESS_DWORD:
ByteAlignment = 4;
BitLength = 32;
break;
case AML_FIELD_ACCESS_QWORD: /* ACPI 2.0 */
ByteAlignment = 8;
BitLength = 64;
break;
default:
/* Invalid field access type */
ACPI_ERROR ((AE_INFO,
"Unknown field access type %X",
Access));
return_UINT32 (0);
}
if (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_BUFFER_FIELD)
{
/*
* BufferField access can be on any byte boundary, so the
* ByteAlignment is always 1 byte -- regardless of any ByteAlignment
* implied by the field access type.
*/
ByteAlignment = 1;
}
*ReturnByteAlignment = ByteAlignment;
return_UINT32 (BitLength);
}
/*******************************************************************************
*
* FUNCTION: AcpiExPrepCommonFieldObject
*
* PARAMETERS: ObjDesc - The field object
* FieldFlags - Access, LockRule, and UpdateRule.
* The format of a FieldFlag is described
* in the ACPI specification
* FieldAttribute - Special attributes (not used)
* FieldBitPosition - Field start position
* FieldBitLength - Field length in number of bits
*
* RETURN: Status
*
* DESCRIPTION: Initialize the areas of the field object that are common
* to the various types of fields. Note: This is very "sensitive"
* code because we are solving the general case for field
* alignment.
*
******************************************************************************/
ACPI_STATUS
AcpiExPrepCommonFieldObject (
ACPI_OPERAND_OBJECT *ObjDesc,
UINT8 FieldFlags,
UINT8 FieldAttribute,
UINT32 FieldBitPosition,
UINT32 FieldBitLength)
{
UINT32 AccessBitWidth;
UINT32 ByteAlignment;
UINT32 NearestByteAddress;
ACPI_FUNCTION_TRACE (ExPrepCommonFieldObject);
/*
* Note: the structure being initialized is the
* ACPI_COMMON_FIELD_INFO; No structure fields outside of the common
* area are initialized by this procedure.
*/
ObjDesc->CommonField.FieldFlags = FieldFlags;
ObjDesc->CommonField.Attribute = FieldAttribute;
ObjDesc->CommonField.BitLength = FieldBitLength;
/*
* Decode the access type so we can compute offsets. The access type gives
* two pieces of information - the width of each field access and the
* necessary ByteAlignment (address granularity) of the access.
*
* For AnyAcc, the AccessBitWidth is the largest width that is both
* necessary and possible in an attempt to access the whole field in one
* I/O operation. However, for AnyAcc, the ByteAlignment is always one
* byte.
*
* For all Buffer Fields, the ByteAlignment is always one byte.
*
* For all other access types (Byte, Word, Dword, Qword), the Bitwidth is
* the same (equivalent) as the ByteAlignment.
*/
AccessBitWidth = AcpiExDecodeFieldAccess (ObjDesc, FieldFlags,
&ByteAlignment);
if (!AccessBitWidth)
{
return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
}
/* Setup width (access granularity) fields */
ObjDesc->CommonField.AccessByteWidth = (UINT8)
ACPI_DIV_8 (AccessBitWidth); /* 1, 2, 4, 8 */
ObjDesc->CommonField.AccessBitWidth = (UINT8) AccessBitWidth;
/*
* BaseByteOffset is the address of the start of the field within the
* region. It is the byte address of the first *datum* (field-width data
* unit) of the field. (i.e., the first datum that contains at least the
* first *bit* of the field.)
*
* Note: ByteAlignment is always either equal to the AccessBitWidth or 8
* (Byte access), and it defines the addressing granularity of the parent
* region or buffer.
*/
NearestByteAddress =
ACPI_ROUND_BITS_DOWN_TO_BYTES (FieldBitPosition);
ObjDesc->CommonField.BaseByteOffset = (UINT32)
ACPI_ROUND_DOWN (NearestByteAddress, ByteAlignment);
/*
* StartFieldBitOffset is the offset of the first bit of the field within
* a field datum.
*/
ObjDesc->CommonField.StartFieldBitOffset = (UINT8)
(FieldBitPosition - ACPI_MUL_8 (ObjDesc->CommonField.BaseByteOffset));
/*
* Does the entire field fit within a single field access element? (datum)
* (i.e., without crossing a datum boundary)
*/
if ((ObjDesc->CommonField.StartFieldBitOffset + FieldBitLength) <=
(UINT16) AccessBitWidth)
{
ObjDesc->Common.Flags |= AOPOBJ_SINGLE_DATUM;
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiExPrepFieldValue
*
* PARAMETERS: Info - Contains all field creation info
*
* RETURN: Status
*
* DESCRIPTION: Construct an ACPI_OPERAND_OBJECT of type DefField and
* connect it to the parent Node.
*
******************************************************************************/
ACPI_STATUS
AcpiExPrepFieldValue (
ACPI_CREATE_FIELD_INFO *Info)
{
ACPI_OPERAND_OBJECT *ObjDesc;
ACPI_OPERAND_OBJECT *SecondDesc = NULL;
UINT32 Type;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (ExPrepFieldValue);
/* Parameter validation */
if (Info->FieldType != ACPI_TYPE_LOCAL_INDEX_FIELD)
{
if (!Info->RegionNode)
{
ACPI_ERROR ((AE_INFO, "Null RegionNode"));
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
Type = AcpiNsGetType (Info->RegionNode);
if (Type != ACPI_TYPE_REGION)
{
ACPI_ERROR ((AE_INFO,
"Needed Region, found type %X (%s)",
Type, AcpiUtGetTypeName (Type)));
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
}
/* Allocate a new field object */
ObjDesc = AcpiUtCreateInternalObject (Info->FieldType);
if (!ObjDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Initialize areas of the object that are common to all fields */
ObjDesc->CommonField.Node = Info->FieldNode;
Status = AcpiExPrepCommonFieldObject (ObjDesc, Info->FieldFlags,
Info->Attribute, Info->FieldBitPosition, Info->FieldBitLength);
if (ACPI_FAILURE (Status))
{
AcpiUtDeleteObjectDesc (ObjDesc);
return_ACPI_STATUS (Status);
}
/* Initialize areas of the object that are specific to the field type */
switch (Info->FieldType)
{
case ACPI_TYPE_LOCAL_REGION_FIELD:
ObjDesc->Field.RegionObj = AcpiNsGetAttachedObject (Info->RegionNode);
/* An additional reference for the container */
AcpiUtAddReference (ObjDesc->Field.RegionObj);
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",
ObjDesc->Field.StartFieldBitOffset, ObjDesc->Field.BaseByteOffset,
ObjDesc->Field.AccessByteWidth, ObjDesc->Field.RegionObj));
break;
case ACPI_TYPE_LOCAL_BANK_FIELD:
ObjDesc->BankField.Value = Info->BankValue;
ObjDesc->BankField.RegionObj = AcpiNsGetAttachedObject (
Info->RegionNode);
ObjDesc->BankField.BankObj = AcpiNsGetAttachedObject (
Info->RegisterNode);
/* An additional reference for the attached objects */
AcpiUtAddReference (ObjDesc->BankField.RegionObj);
AcpiUtAddReference (ObjDesc->BankField.BankObj);
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n",
ObjDesc->BankField.StartFieldBitOffset,
ObjDesc->BankField.BaseByteOffset,
ObjDesc->Field.AccessByteWidth,
ObjDesc->BankField.RegionObj,
ObjDesc->BankField.BankObj));
/*
* Remember location in AML stream of the field unit
* opcode and operands -- since the BankValue
* operands must be evaluated.
*/
SecondDesc = ObjDesc->Common.NextObject;
SecondDesc->Extra.AmlStart = ((ACPI_PARSE_OBJECT*) (Info->DataRegisterNode))->Named.Data;
SecondDesc->Extra.AmlLength = ((ACPI_PARSE_OBJECT*) (Info->DataRegisterNode))->Named.Length;
break;
case ACPI_TYPE_LOCAL_INDEX_FIELD:
/* Get the Index and Data registers */
ObjDesc->IndexField.IndexObj = AcpiNsGetAttachedObject (
Info->RegisterNode);
ObjDesc->IndexField.DataObj = AcpiNsGetAttachedObject (
Info->DataRegisterNode);
if (!ObjDesc->IndexField.DataObj || !ObjDesc->IndexField.IndexObj)
{
ACPI_ERROR ((AE_INFO, "Null Index Object during field prep"));
AcpiUtDeleteObjectDesc (ObjDesc);
return_ACPI_STATUS (AE_AML_INTERNAL);
}
/* An additional reference for the attached objects */
AcpiUtAddReference (ObjDesc->IndexField.DataObj);
AcpiUtAddReference (ObjDesc->IndexField.IndexObj);
/*
* April 2006: Changed to match MS behavior
*
* The value written to the Index register is the byte offset of the
* target field in units of the granularity of the IndexField
*
* Previously, the value was calculated as an index in terms of the
* width of the Data register, as below:
*
* ObjDesc->IndexField.Value = (UINT32)
* (Info->FieldBitPosition / ACPI_MUL_8 (
* ObjDesc->Field.AccessByteWidth));
*
* February 2006: Tried value as a byte offset:
* ObjDesc->IndexField.Value = (UINT32)
* ACPI_DIV_8 (Info->FieldBitPosition);
*/
ObjDesc->IndexField.Value = (UINT32) ACPI_ROUND_DOWN (
ACPI_DIV_8 (Info->FieldBitPosition),
ObjDesc->IndexField.AccessByteWidth);
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"IndexField: BitOff %X, Off %X, Value %X, Gran %X, Index %p, Data %p\n",
ObjDesc->IndexField.StartFieldBitOffset,
ObjDesc->IndexField.BaseByteOffset,
ObjDesc->IndexField.Value,
ObjDesc->Field.AccessByteWidth,
ObjDesc->IndexField.IndexObj,
ObjDesc->IndexField.DataObj));
break;
default:
/* No other types should get here */
break;
}
/*
* Store the constructed descriptor (ObjDesc) into the parent Node,
* preserving the current type of that NamedObj.
*/
Status = AcpiNsAttachObject (Info->FieldNode, ObjDesc,
AcpiNsGetType (Info->FieldNode));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Set NamedObj %p [%4.4s], ObjDesc %p\n",
Info->FieldNode, AcpiUtGetNodeName (Info->FieldNode), ObjDesc));
/* Remove local reference to the object */
AcpiUtRemoveReference (ObjDesc);
return_ACPI_STATUS (Status);
}