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minix/drivers/acpi/executer/exprep.c

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ACPI driver - 99% of the code is Intel's ACPICA. The license is compliant with BSD and GNU and virtually all systems that use ACPI use this code, For instance it is part of the Linux kernel. - The only minix specific files are acpi.c osminixxf.c platform/acminix.h and include/minix/acpi.h - At the moment the driver does not register interrupt hooks which I believe is mainly for handling PnP, events like "battery level is low" and power management. Should not be difficult to add it if need be. - The interface to the outside world is virtually non-existent except a trivial message based service for PCI driver to query which device is connected to what IRQ line. This will evolve as more components start using this driver. VM, Scheduler and IOMMU are the possible users right now. - because of dependency on a native 64bit (long long, part of c99) it is compiled only with a gnu-like compilers which in case of Minix includes gcc llvm-gcc and clang
2010-09-02 17:44:04 +02:00
/******************************************************************************
*
* Module Name: exprep - ACPI AML (p-code) execution - field prep utilities
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#define __EXPREP_C__
#include "acpi.h"
#include "accommon.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 %u, Bit offset %u\n",
FieldBitLength, FieldBitOffset));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Byte Length %u, Byte Offset %u, End Offset %u\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 %u end is within region\n", AccessByteWidth));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Field Start %u, Field End %u -- requires %u 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 %u\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 %u 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 %u\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 0x%X",
Access));
return_UINT32 (0);
}
if (ObjDesc->Common.Type == 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));
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 0x%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_CAST_PTR (ACPI_PARSE_OBJECT, Info->DataRegisterNode)->Named.Data;
SecondDesc->Extra.AmlLength = ACPI_CAST_PTR (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);
}
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