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/******************************************************************************
*
* Module Name: exfield - ACPI AML (p-code) execution - field manipulation
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2011, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#define __EXFIELD_C__
#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#include <contrib/dev/acpica/include/acdispat.h>
#include <contrib/dev/acpica/include/acinterp.h>
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exfield")
/*******************************************************************************
*
* FUNCTION: AcpiExReadDataFromField
*
* PARAMETERS: WalkState - Current execution state
* ObjDesc - The named field
* RetBufferDesc - Where the return data object is stored
*
* RETURN: Status
*
* DESCRIPTION: Read from a named field. Returns either an Integer or a
* Buffer, depending on the size of the field.
*
******************************************************************************/
ACPI_STATUS
AcpiExReadDataFromField (
ACPI_WALK_STATE *WalkState,
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **RetBufferDesc)
{
ACPI_STATUS Status;
ACPI_OPERAND_OBJECT *BufferDesc;
ACPI_SIZE Length;
void *Buffer;
UINT32 Function;
ACPI_FUNCTION_TRACE_PTR (ExReadDataFromField, ObjDesc);
/* Parameter validation */
if (!ObjDesc)
{
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
if (!RetBufferDesc)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
if (ObjDesc->Common.Type == 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);
}
}
}
else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
(ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
{
/*
* This is an SMBus or IPMI read. We must create a buffer to hold
* the data and then directly access the region handler.
*
* Note: Smbus protocol value is passed in upper 16-bits of Function
*/
if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS)
{
Length = ACPI_SMBUS_BUFFER_SIZE;
Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
}
else /* IPMI */
{
Length = ACPI_IPMI_BUFFER_SIZE;
Function = ACPI_READ;
}
BufferDesc = AcpiUtCreateBufferObject (Length);
if (!BufferDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/* Call the region handler for the read */
Status = AcpiExAccessRegion (ObjDesc, 0,
ACPI_CAST_PTR (UINT64, BufferDesc->Buffer.Pointer),
Function);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
goto Exit;
}
/*
* Allocate a buffer for the contents of the field.
*
* If the field is larger than the current integer width, create
* a BUFFER to hold it. Otherwise, use an INTEGER. This allows
* the use of arithmetic operators on the returned value if the
* field size is equal or smaller than an Integer.
*
* Note: Field.length is in bits.
*/
Length = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->Field.BitLength);
if (Length > AcpiGbl_IntegerByteWidth)
{
/* Field is too large for an Integer, create a Buffer instead */
BufferDesc = AcpiUtCreateBufferObject (Length);
if (!BufferDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
Buffer = BufferDesc->Buffer.Pointer;
}
else
{
/* Field will fit within an Integer (normal case) */
BufferDesc = AcpiUtCreateIntegerObject ((UINT64) 0);
if (!BufferDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
Length = AcpiGbl_IntegerByteWidth;
Buffer = &BufferDesc->Integer.Value;
}
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
ObjDesc, ObjDesc->Common.Type, Buffer, (UINT32) Length));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
ObjDesc->CommonField.BitLength,
ObjDesc->CommonField.StartFieldBitOffset,
ObjDesc->CommonField.BaseByteOffset));
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/* Read from the field */
Status = AcpiExExtractFromField (ObjDesc, Buffer, (UINT32) Length);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
Exit:
if (ACPI_FAILURE (Status))
{
AcpiUtRemoveReference (BufferDesc);
}
else
{
*RetBufferDesc = BufferDesc;
}
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiExWriteDataToField
*
* PARAMETERS: SourceDesc - Contains data to write
* ObjDesc - The named field
* ResultDesc - Where the return value is returned, if any
*
* RETURN: Status
*
* DESCRIPTION: Write to a named field
*
******************************************************************************/
ACPI_STATUS
AcpiExWriteDataToField (
ACPI_OPERAND_OBJECT *SourceDesc,
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **ResultDesc)
{
ACPI_STATUS Status;
UINT32 Length;
void *Buffer;
ACPI_OPERAND_OBJECT *BufferDesc;
UINT32 Function;
ACPI_FUNCTION_TRACE_PTR (ExWriteDataToField, ObjDesc);
/* Parameter validation */
if (!SourceDesc || !ObjDesc)
{
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
if (ObjDesc->Common.Type == 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);
}
}
}
else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
(ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
{
/*
* This is an SMBus or IPMI write. We will bypass the entire field
* mechanism and handoff the buffer directly to the handler. For
* these address spaces, the buffer is bi-directional; on a write,
* return data is returned in the same buffer.
*
* Source must be a buffer of sufficient size:
* ACPI_SMBUS_BUFFER_SIZE or ACPI_IPMI_BUFFER_SIZE.
*
* Note: SMBus protocol type is passed in upper 16-bits of Function
*/
if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
{
ACPI_ERROR ((AE_INFO,
"SMBus or IPMI write requires Buffer, found type %s",
AcpiUtGetObjectTypeName (SourceDesc)));
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS)
{
Length = ACPI_SMBUS_BUFFER_SIZE;
Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
}
else /* IPMI */
{
Length = ACPI_IPMI_BUFFER_SIZE;
Function = ACPI_WRITE;
}
if (SourceDesc->Buffer.Length < Length)
{
ACPI_ERROR ((AE_INFO,
"SMBus or IPMI write requires Buffer of length %u, found length %u",
Length, SourceDesc->Buffer.Length));
return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
}
/* Create the bi-directional buffer */
BufferDesc = AcpiUtCreateBufferObject (Length);
if (!BufferDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
Buffer = BufferDesc->Buffer.Pointer;
ACPI_MEMCPY (Buffer, SourceDesc->Buffer.Pointer, Length);
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/*
* Perform the write (returns status and perhaps data in the
* same buffer)
*/
Status = AcpiExAccessRegion (ObjDesc, 0,
(UINT64 *) Buffer, Function);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
*ResultDesc = BufferDesc;
return_ACPI_STATUS (Status);
}
/* Get a pointer to the data to be written */
switch (SourceDesc->Common.Type)
{
case ACPI_TYPE_INTEGER:
Buffer = &SourceDesc->Integer.Value;
Length = sizeof (SourceDesc->Integer.Value);
break;
case ACPI_TYPE_BUFFER:
Buffer = SourceDesc->Buffer.Pointer;
Length = SourceDesc->Buffer.Length;
break;
case ACPI_TYPE_STRING:
Buffer = SourceDesc->String.Pointer;
Length = SourceDesc->String.Length;
break;
default:
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
SourceDesc, AcpiUtGetTypeName (SourceDesc->Common.Type),
SourceDesc->Common.Type, Buffer, Length));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type),
ObjDesc->Common.Type,
ObjDesc->CommonField.BitLength,
ObjDesc->CommonField.StartFieldBitOffset,
ObjDesc->CommonField.BaseByteOffset));
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/* Write to the field */
Status = AcpiExInsertIntoField (ObjDesc, Buffer, Length);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
return_ACPI_STATUS (Status);
}