/****************************************************************************** * * Module Name: exprep - ACPI AML (p-code) execution - field prep utilities * *****************************************************************************/ /* * 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 __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 (values are: 1, 2, 4, 8) */ ObjDesc->CommonField.AccessByteWidth = (UINT8) ACPI_DIV_8 (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; ACPI_STATUS Status; UINT32 AccessByteWidth; UINT32 Type; 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); /* Allow full data read from EC address space */ if ((ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_EC) && (ObjDesc->CommonField.BitLength > 8)) { AccessByteWidth = ACPI_ROUND_BITS_UP_TO_BYTES ( ObjDesc->CommonField.BitLength); /* Maximum byte width supported is 255 */ if (AccessByteWidth < 256) { ObjDesc->CommonField.AccessByteWidth = (UINT8) AccessByteWidth; } } /* 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); }