/****************************************************************************** * * Module Name: exfield - ACPI AML (p-code) execution - field manipulation * $Revision: 112 $ * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2002, 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 __EXFIELD_C__ #include "acpi.h" #include "acdispat.h" #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; UINT32 Length; void *Buffer; BOOLEAN Locked; ACPI_FUNCTION_TRACE_PTR ("ExReadDataFromField", ObjDesc); /* Parameter validation */ if (!ObjDesc) { return_ACPI_STATUS (AE_AML_NO_OPERAND); } if (ACPI_GET_OBJECT_TYPE (ObjDesc) == 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); } } } /* * Allocate a buffer for the contents of the field. * * If the field is larger than the size of an ACPI_INTEGER, 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_ROUND_BITS_UP_TO_BYTES (ObjDesc->Field.BitLength); if (Length > AcpiGbl_IntegerByteWidth) { /* Field is too large for an Integer, create a Buffer instead */ BufferDesc = AcpiUtCreateInternalObject (ACPI_TYPE_BUFFER); if (!BufferDesc) { return_ACPI_STATUS (AE_NO_MEMORY); } /* Create the actual read buffer */ BufferDesc->Buffer.Pointer = ACPI_MEM_CALLOCATE (Length); if (!BufferDesc->Buffer.Pointer) { AcpiUtRemoveReference (BufferDesc); return_ACPI_STATUS (AE_NO_MEMORY); } /* Complete the buffer object initialization */ BufferDesc->Common.Flags = AOPOBJ_DATA_VALID; BufferDesc->Buffer.Length = Length; Buffer = BufferDesc->Buffer.Pointer; } else { /* Field will fit within an Integer (normal case) */ BufferDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); if (!BufferDesc) { return_ACPI_STATUS (AE_NO_MEMORY); } Length = AcpiGbl_IntegerByteWidth; BufferDesc->Integer.Value = 0; Buffer = &BufferDesc->Integer.Value; } ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Obj=%p Type=%X Buf=%p Len=%X\n", ObjDesc, ACPI_GET_OBJECT_TYPE (ObjDesc), Buffer, Length)); ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "FieldWrite: BitLen=%X BitOff=%X ByteOff=%X\n", ObjDesc->CommonField.BitLength, ObjDesc->CommonField.StartFieldBitOffset, ObjDesc->CommonField.BaseByteOffset)); Locked = AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags); /* Read from the field */ Status = AcpiExExtractFromField (ObjDesc, Buffer, Length); /* * Release global lock if we acquired it earlier */ AcpiExReleaseGlobalLock (Locked); if (ACPI_FAILURE (Status)) { AcpiUtRemoveReference (BufferDesc); } else if (RetBufferDesc) { *RetBufferDesc = BufferDesc; } return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExWriteDataToField * * PARAMETERS: SourceDesc - Contains data to write * ObjDesc - The named field * * RETURN: Status * * DESCRIPTION: Write to a named field * ******************************************************************************/ ACPI_STATUS AcpiExWriteDataToField ( ACPI_OPERAND_OBJECT *SourceDesc, ACPI_OPERAND_OBJECT *ObjDesc) { ACPI_STATUS Status; UINT32 Length; UINT32 RequiredLength; void *Buffer; void *NewBuffer; BOOLEAN Locked; ACPI_FUNCTION_TRACE_PTR ("ExWriteDataToField", ObjDesc); /* Parameter validation */ if (!SourceDesc || !ObjDesc) { return_ACPI_STATUS (AE_AML_NO_OPERAND); } if (ACPI_GET_OBJECT_TYPE (ObjDesc) == 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); } } } /* * Get a pointer to the data to be written */ switch (ACPI_GET_OBJECT_TYPE (SourceDesc)) { 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); } /* * 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. */ NewBuffer = NULL; RequiredLength = ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength); if (Length < RequiredLength) { /* We need to create a new buffer */ NewBuffer = ACPI_MEM_CALLOCATE (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, Length); Buffer = NewBuffer; Length = RequiredLength; } ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Obj=%p Type=%X Buf=%p Len=%X\n", ObjDesc, ACPI_GET_OBJECT_TYPE (ObjDesc), Buffer, Length)); ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "FieldRead: BitLen=%X BitOff=%X ByteOff=%X\n", ObjDesc->CommonField.BitLength, ObjDesc->CommonField.StartFieldBitOffset, ObjDesc->CommonField.BaseByteOffset)); Locked = AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags); /* * Write to the field */ Status = AcpiExInsertIntoField (ObjDesc, Buffer, Length); /* * Release global lock if we acquired it earlier */ AcpiExReleaseGlobalLock (Locked); /* Free temporary buffer if we used one */ if (NewBuffer) { ACPI_MEM_FREE (NewBuffer); } return_ACPI_STATUS (Status); }