/****************************************************************************** * * Module Name: exfield - AML execution - FieldUnit read/write * *****************************************************************************/ /* * Copyright (C) 2000 - 2023, 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 MERCHANTABILITY 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. */ #include "acpi.h" #include "accommon.h" #include "acdispat.h" #include "acinterp.h" #include "amlcode.h" #define _COMPONENT ACPI_EXECUTER ACPI_MODULE_NAME ("exfield") /* * This table maps the various Attrib protocols to the byte transfer * length. Used for the generic serial bus. */ #define ACPI_INVALID_PROTOCOL_ID 0x80 #define ACPI_MAX_PROTOCOL_ID 0x0F static const UINT8 AcpiProtocolLengths[] = { ACPI_INVALID_PROTOCOL_ID, /* 0 - reserved */ ACPI_INVALID_PROTOCOL_ID, /* 1 - reserved */ 0x00, /* 2 - ATTRIB_QUICK */ ACPI_INVALID_PROTOCOL_ID, /* 3 - reserved */ 0x01, /* 4 - ATTRIB_SEND_RECEIVE */ ACPI_INVALID_PROTOCOL_ID, /* 5 - reserved */ 0x01, /* 6 - ATTRIB_BYTE */ ACPI_INVALID_PROTOCOL_ID, /* 7 - reserved */ 0x02, /* 8 - ATTRIB_WORD */ ACPI_INVALID_PROTOCOL_ID, /* 9 - reserved */ 0xFF, /* A - ATTRIB_BLOCK */ 0xFF, /* B - ATTRIB_BYTES */ 0x02, /* C - ATTRIB_PROCESS_CALL */ 0xFF, /* D - ATTRIB_BLOCK_PROCESS_CALL */ 0xFF, /* E - ATTRIB_RAW_BYTES */ 0xFF /* F - ATTRIB_RAW_PROCESS_BYTES */ }; #define PCC_MASTER_SUBSPACE 3 /* * The following macros determine a given offset is a COMD field. * According to the specification, generic subspaces (types 0-2) contains a * 2-byte COMD field at offset 4 and master subspaces (type 3) contains a 4-byte * COMD field starting at offset 12. */ #define GENERIC_SUBSPACE_COMMAND(a) (4 == a || a == 5) #define MASTER_SUBSPACE_COMMAND(a) (12 <= a && a <= 15) /******************************************************************************* * * FUNCTION: AcpiExGetProtocolBufferLength * * PARAMETERS: ProtocolId - The type of the protocol indicated by region * field access attributes * ReturnLength - Where the protocol byte transfer length is * returned * * RETURN: Status and decoded byte transfer length * * DESCRIPTION: This routine returns the length of the GenericSerialBus * protocol bytes * ******************************************************************************/ ACPI_STATUS AcpiExGetProtocolBufferLength ( UINT32 ProtocolId, UINT32 *ReturnLength) { if ((ProtocolId > ACPI_MAX_PROTOCOL_ID) || (AcpiProtocolLengths[ProtocolId] == ACPI_INVALID_PROTOCOL_ID)) { ACPI_ERROR ((AE_INFO, "Invalid Field/AccessAs protocol ID: 0x%4.4X", ProtocolId)); return (AE_AML_PROTOCOL); } *ReturnLength = AcpiProtocolLengths[ProtocolId]; return (AE_OK); } /******************************************************************************* * * 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 and whether if a * field is created by the CreateField() operator. * ******************************************************************************/ ACPI_STATUS AcpiExReadDataFromField ( ACPI_WALK_STATE *WalkState, ACPI_OPERAND_OBJECT *ObjDesc, ACPI_OPERAND_OBJECT **RetBufferDesc) { ACPI_STATUS Status; ACPI_OPERAND_OBJECT *BufferDesc; void *Buffer; UINT32 BufferLength; 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_GSBUS || ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI || ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_RT || ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_FIXED_HARDWARE)) { /* SMBus, GSBus, IPMI serial */ Status = AcpiExReadSerialBus (ObjDesc, RetBufferDesc); return_ACPI_STATUS (Status); } /* * 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. * * However, all buffer fields created by CreateField operator needs to * remain as a buffer to match other AML interpreter implementations. * * Note: Field.length is in bits. */ BufferLength = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES ( ObjDesc->Field.BitLength); if (BufferLength > AcpiGbl_IntegerByteWidth || (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD && ObjDesc->BufferField.IsCreateField)) { /* Field is too large for an Integer, create a Buffer instead */ BufferDesc = AcpiUtCreateBufferObject (BufferLength); 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); } BufferLength = AcpiGbl_IntegerByteWidth; Buffer = &BufferDesc->Integer.Value; } if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) && (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO)) { /* General Purpose I/O */ Status = AcpiExReadGpio (ObjDesc, Buffer); goto Exit; } else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) && (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_COMM)) { /* * Reading from a PCC field unit does not require the handler because * it only requires reading from the InternalPccBuffer. */ ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "PCC FieldRead bits %u\n", ObjDesc->Field.BitLength)); memcpy (Buffer, ObjDesc->Field.RegionObj->Field.InternalPccBuffer + ObjDesc->Field.BaseByteOffset, (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES ( ObjDesc->Field.BitLength)); *RetBufferDesc = BufferDesc; return AE_OK; } ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n", ObjDesc, ObjDesc->Common.Type, Buffer, BufferLength)); 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, BufferLength); 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 BufferLength; UINT32 DataLength; void *Buffer; 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_GPIO)) { /* General Purpose I/O */ Status = AcpiExWriteGpio (SourceDesc, ObjDesc, ResultDesc); 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_GSBUS || ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI || ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_RT || ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_FIXED_HARDWARE)) { /* SMBus, GSBus, IPMI serial */ Status = AcpiExWriteSerialBus (SourceDesc, ObjDesc, ResultDesc); return_ACPI_STATUS (Status); } else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) && (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_COMM)) { /* * According to the spec a write to the COMD field will invoke the * region handler. Otherwise, write to the PccInternal buffer. This * implementation will use the offsets specified rather than the name * of the field. This is considered safer because some firmware tools * are known to obfiscate named objects. */ DataLength = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES ( ObjDesc->Field.BitLength); memcpy (ObjDesc->Field.RegionObj->Field.InternalPccBuffer + ObjDesc->Field.BaseByteOffset, SourceDesc->Buffer.Pointer, DataLength); if (MASTER_SUBSPACE_COMMAND (ObjDesc->Field.BaseByteOffset)) { /* Perform the write */ ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "PCC COMD field has been written. Invoking PCC handler now.\n")); Status = AcpiExAccessRegion ( ObjDesc, 0, (UINT64 *) ObjDesc->Field.RegionObj->Field.InternalPccBuffer, ACPI_WRITE); return_ACPI_STATUS (Status); } return (AE_OK); } /* Get a pointer to the data to be written */ switch (SourceDesc->Common.Type) { case ACPI_TYPE_INTEGER: Buffer = &SourceDesc->Integer.Value; BufferLength = sizeof (SourceDesc->Integer.Value); break; case ACPI_TYPE_BUFFER: Buffer = SourceDesc->Buffer.Pointer; BufferLength = SourceDesc->Buffer.Length; break; case ACPI_TYPE_STRING: Buffer = SourceDesc->String.Pointer; BufferLength = 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, BufferLength)); 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, BufferLength); AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags); return_ACPI_STATUS (Status); }