/****************************************************************************** * * Module Name: exfldio - Aml Field I/O * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2009, 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 __EXFLDIO_C__ #include "acpi.h" #include "accommon.h" #include "acinterp.h" #include "amlcode.h" #include "acevents.h" #include "acdispat.h" #define _COMPONENT ACPI_EXECUTER ACPI_MODULE_NAME ("exfldio") /* Local prototypes */ static ACPI_STATUS AcpiExFieldDatumIo ( ACPI_OPERAND_OBJECT *ObjDesc, UINT32 FieldDatumByteOffset, ACPI_INTEGER *Value, UINT32 ReadWrite); static BOOLEAN AcpiExRegisterOverflow ( ACPI_OPERAND_OBJECT *ObjDesc, ACPI_INTEGER Value); static ACPI_STATUS AcpiExSetupRegion ( ACPI_OPERAND_OBJECT *ObjDesc, UINT32 FieldDatumByteOffset); /******************************************************************************* * * FUNCTION: AcpiExSetupRegion * * PARAMETERS: ObjDesc - Field to be read or written * FieldDatumByteOffset - Byte offset of this datum within the * parent field * * RETURN: Status * * DESCRIPTION: Common processing for AcpiExExtractFromField and * AcpiExInsertIntoField. Initialize the Region if necessary and * validate the request. * ******************************************************************************/ static ACPI_STATUS AcpiExSetupRegion ( ACPI_OPERAND_OBJECT *ObjDesc, UINT32 FieldDatumByteOffset) { ACPI_STATUS Status = AE_OK; ACPI_OPERAND_OBJECT *RgnDesc; ACPI_FUNCTION_TRACE_U32 (ExSetupRegion, FieldDatumByteOffset); RgnDesc = ObjDesc->CommonField.RegionObj; /* We must have a valid region */ if (RgnDesc->Common.Type != ACPI_TYPE_REGION) { ACPI_ERROR ((AE_INFO, "Needed Region, found type %X (%s)", RgnDesc->Common.Type, AcpiUtGetObjectTypeName (RgnDesc))); return_ACPI_STATUS (AE_AML_OPERAND_TYPE); } /* * If the Region Address and Length have not been previously evaluated, * evaluate them now and save the results. */ if (!(RgnDesc->Common.Flags & AOPOBJ_DATA_VALID)) { Status = AcpiDsGetRegionArguments (RgnDesc); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } } /* * Exit now for SMBus address space, it has a non-linear address space * and the request cannot be directly validated */ if (RgnDesc->Region.SpaceId == ACPI_ADR_SPACE_SMBUS) { /* SMBus has a non-linear address space */ return_ACPI_STATUS (AE_OK); } #ifdef ACPI_UNDER_DEVELOPMENT /* * If the Field access is AnyAcc, we can now compute the optimal * access (because we know know the length of the parent region) */ if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)) { if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } } #endif /* * Validate the request. The entire request from the byte offset for a * length of one field datum (access width) must fit within the region. * (Region length is specified in bytes) */ if (RgnDesc->Region.Length < (ObjDesc->CommonField.BaseByteOffset + FieldDatumByteOffset + ObjDesc->CommonField.AccessByteWidth)) { if (AcpiGbl_EnableInterpreterSlack) { /* * Slack mode only: We will go ahead and allow access to this * field if it is within the region length rounded up to the next * access width boundary. ACPI_SIZE cast for 64-bit compile. */ if (ACPI_ROUND_UP (RgnDesc->Region.Length, ObjDesc->CommonField.AccessByteWidth) >= ((ACPI_SIZE) ObjDesc->CommonField.BaseByteOffset + ObjDesc->CommonField.AccessByteWidth + FieldDatumByteOffset)) { return_ACPI_STATUS (AE_OK); } } if (RgnDesc->Region.Length < ObjDesc->CommonField.AccessByteWidth) { /* * This is the case where the AccessType (AccWord, etc.) is wider * than the region itself. For example, a region of length one * byte, and a field with Dword access specified. */ ACPI_ERROR ((AE_INFO, "Field [%4.4s] access width (%d bytes) too large for region [%4.4s] (length %X)", AcpiUtGetNodeName (ObjDesc->CommonField.Node), ObjDesc->CommonField.AccessByteWidth, AcpiUtGetNodeName (RgnDesc->Region.Node), RgnDesc->Region.Length)); } /* * Offset rounded up to next multiple of field width * exceeds region length, indicate an error */ ACPI_ERROR ((AE_INFO, "Field [%4.4s] Base+Offset+Width %X+%X+%X is beyond end of region [%4.4s] (length %X)", AcpiUtGetNodeName (ObjDesc->CommonField.Node), ObjDesc->CommonField.BaseByteOffset, FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth, AcpiUtGetNodeName (RgnDesc->Region.Node), RgnDesc->Region.Length)); return_ACPI_STATUS (AE_AML_REGION_LIMIT); } return_ACPI_STATUS (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiExAccessRegion * * PARAMETERS: ObjDesc - Field to be read * FieldDatumByteOffset - Byte offset of this datum within the * parent field * Value - Where to store value (must at least * the size of ACPI_INTEGER) * Function - Read or Write flag plus other region- * dependent flags * * RETURN: Status * * DESCRIPTION: Read or Write a single field datum to an Operation Region. * ******************************************************************************/ ACPI_STATUS AcpiExAccessRegion ( ACPI_OPERAND_OBJECT *ObjDesc, UINT32 FieldDatumByteOffset, ACPI_INTEGER *Value, UINT32 Function) { ACPI_STATUS Status; ACPI_OPERAND_OBJECT *RgnDesc; UINT32 RegionOffset; ACPI_FUNCTION_TRACE (ExAccessRegion); /* * Ensure that the region operands are fully evaluated and verify * the validity of the request */ Status = AcpiExSetupRegion (ObjDesc, FieldDatumByteOffset); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* * The physical address of this field datum is: * * 1) The base of the region, plus * 2) The base offset of the field, plus * 3) The current offset into the field */ RgnDesc = ObjDesc->CommonField.RegionObj; RegionOffset = ObjDesc->CommonField.BaseByteOffset + FieldDatumByteOffset; if ((Function & ACPI_IO_MASK) == ACPI_READ) { ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[READ]")); } else { ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[WRITE]")); } ACPI_DEBUG_PRINT_RAW ((ACPI_DB_BFIELD, " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %p\n", AcpiUtGetRegionName (RgnDesc->Region.SpaceId), RgnDesc->Region.SpaceId, ObjDesc->CommonField.AccessByteWidth, ObjDesc->CommonField.BaseByteOffset, FieldDatumByteOffset, ACPI_CAST_PTR (void, (RgnDesc->Region.Address + RegionOffset)))); /* Invoke the appropriate AddressSpace/OpRegion handler */ Status = AcpiEvAddressSpaceDispatch (RgnDesc, Function, RegionOffset, ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth), Value); if (ACPI_FAILURE (Status)) { if (Status == AE_NOT_IMPLEMENTED) { ACPI_ERROR ((AE_INFO, "Region %s(%X) not implemented", AcpiUtGetRegionName (RgnDesc->Region.SpaceId), RgnDesc->Region.SpaceId)); } else if (Status == AE_NOT_EXIST) { ACPI_ERROR ((AE_INFO, "Region %s(%X) has no handler", AcpiUtGetRegionName (RgnDesc->Region.SpaceId), RgnDesc->Region.SpaceId)); } } return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExRegisterOverflow * * PARAMETERS: ObjDesc - Register(Field) to be written * Value - Value to be stored * * RETURN: TRUE if value overflows the field, FALSE otherwise * * DESCRIPTION: Check if a value is out of range of the field being written. * Used to check if the values written to Index and Bank registers * are out of range. Normally, the value is simply truncated * to fit the field, but this case is most likely a serious * coding error in the ASL. * ******************************************************************************/ static BOOLEAN AcpiExRegisterOverflow ( ACPI_OPERAND_OBJECT *ObjDesc, ACPI_INTEGER Value) { if (ObjDesc->CommonField.BitLength >= ACPI_INTEGER_BIT_SIZE) { /* * The field is large enough to hold the maximum integer, so we can * never overflow it. */ return (FALSE); } if (Value >= ((ACPI_INTEGER) 1 << ObjDesc->CommonField.BitLength)) { /* * The Value is larger than the maximum value that can fit into * the register. */ return (TRUE); } /* The Value will fit into the field with no truncation */ return (FALSE); } /******************************************************************************* * * FUNCTION: AcpiExFieldDatumIo * * PARAMETERS: ObjDesc - Field to be read * FieldDatumByteOffset - Byte offset of this datum within the * parent field * Value - Where to store value (must be 64 bits) * ReadWrite - Read or Write flag * * RETURN: Status * * DESCRIPTION: Read or Write a single datum of a field. The FieldType is * demultiplexed here to handle the different types of fields * (BufferField, RegionField, IndexField, BankField) * ******************************************************************************/ static ACPI_STATUS AcpiExFieldDatumIo ( ACPI_OPERAND_OBJECT *ObjDesc, UINT32 FieldDatumByteOffset, ACPI_INTEGER *Value, UINT32 ReadWrite) { ACPI_STATUS Status; ACPI_INTEGER LocalValue; ACPI_FUNCTION_TRACE_U32 (ExFieldDatumIo, FieldDatumByteOffset); if (ReadWrite == ACPI_READ) { if (!Value) { LocalValue = 0; /* To support reads without saving return value */ Value = &LocalValue; } /* Clear the entire return buffer first, [Very Important!] */ *Value = 0; } /* * The four types of fields are: * * BufferField - Read/write from/to a Buffer * RegionField - Read/write from/to a Operation Region. * BankField - Write to a Bank Register, then read/write from/to an * OperationRegion * IndexField - Write to an Index Register, then read/write from/to a * Data Register */ switch (ObjDesc->Common.Type) { case 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); } } if (ReadWrite == ACPI_READ) { /* * Copy the data from the source buffer. * Length is the field width in bytes. */ ACPI_MEMCPY (Value, (ObjDesc->BufferField.BufferObj)->Buffer.Pointer + ObjDesc->BufferField.BaseByteOffset + FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth); } else { /* * Copy the data to the target buffer. * Length is the field width in bytes. */ ACPI_MEMCPY ((ObjDesc->BufferField.BufferObj)->Buffer.Pointer + ObjDesc->BufferField.BaseByteOffset + FieldDatumByteOffset, Value, ObjDesc->CommonField.AccessByteWidth); } Status = AE_OK; break; case ACPI_TYPE_LOCAL_BANK_FIELD: /* * Ensure that the BankValue is not beyond the capacity of * the register */ if (AcpiExRegisterOverflow (ObjDesc->BankField.BankObj, (ACPI_INTEGER) ObjDesc->BankField.Value)) { return_ACPI_STATUS (AE_AML_REGISTER_LIMIT); } /* * For BankFields, we must write the BankValue to the BankRegister * (itself a RegionField) before we can access the data. */ Status = AcpiExInsertIntoField (ObjDesc->BankField.BankObj, &ObjDesc->BankField.Value, sizeof (ObjDesc->BankField.Value)); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* * Now that the Bank has been selected, fall through to the * RegionField case and write the datum to the Operation Region */ /*lint -fallthrough */ case ACPI_TYPE_LOCAL_REGION_FIELD: /* * For simple RegionFields, we just directly access the owning * Operation Region. */ Status = AcpiExAccessRegion (ObjDesc, FieldDatumByteOffset, Value, ReadWrite); break; case ACPI_TYPE_LOCAL_INDEX_FIELD: /* * Ensure that the IndexValue is not beyond the capacity of * the register */ if (AcpiExRegisterOverflow (ObjDesc->IndexField.IndexObj, (ACPI_INTEGER) ObjDesc->IndexField.Value)) { return_ACPI_STATUS (AE_AML_REGISTER_LIMIT); } /* Write the index value to the IndexRegister (itself a RegionField) */ FieldDatumByteOffset += ObjDesc->IndexField.Value; ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Write to Index Register: Value %8.8X\n", FieldDatumByteOffset)); Status = AcpiExInsertIntoField (ObjDesc->IndexField.IndexObj, &FieldDatumByteOffset, sizeof (FieldDatumByteOffset)); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } if (ReadWrite == ACPI_READ) { /* Read the datum from the DataRegister */ ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Read from Data Register\n")); Status = AcpiExExtractFromField (ObjDesc->IndexField.DataObj, Value, sizeof (ACPI_INTEGER)); } else { /* Write the datum to the DataRegister */ ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Write to Data Register: Value %8.8X%8.8X\n", ACPI_FORMAT_UINT64 (*Value))); Status = AcpiExInsertIntoField (ObjDesc->IndexField.DataObj, Value, sizeof (ACPI_INTEGER)); } break; default: ACPI_ERROR ((AE_INFO, "Wrong object type in field I/O %X", ObjDesc->Common.Type)); Status = AE_AML_INTERNAL; break; } if (ACPI_SUCCESS (Status)) { if (ReadWrite == ACPI_READ) { ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Value Read %8.8X%8.8X, Width %d\n", ACPI_FORMAT_UINT64 (*Value), ObjDesc->CommonField.AccessByteWidth)); } else { ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Value Written %8.8X%8.8X, Width %d\n", ACPI_FORMAT_UINT64 (*Value), ObjDesc->CommonField.AccessByteWidth)); } } return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExWriteWithUpdateRule * * PARAMETERS: ObjDesc - Field to be written * Mask - bitmask within field datum * FieldValue - Value to write * FieldDatumByteOffset - Offset of datum within field * * RETURN: Status * * DESCRIPTION: Apply the field update rule to a field write * ******************************************************************************/ ACPI_STATUS AcpiExWriteWithUpdateRule ( ACPI_OPERAND_OBJECT *ObjDesc, ACPI_INTEGER Mask, ACPI_INTEGER FieldValue, UINT32 FieldDatumByteOffset) { ACPI_STATUS Status = AE_OK; ACPI_INTEGER MergedValue; ACPI_INTEGER CurrentValue; ACPI_FUNCTION_TRACE_U32 (ExWriteWithUpdateRule, Mask); /* Start with the new bits */ MergedValue = FieldValue; /* If the mask is all ones, we don't need to worry about the update rule */ if (Mask != ACPI_INTEGER_MAX) { /* Decode the update rule */ switch (ObjDesc->CommonField.FieldFlags & AML_FIELD_UPDATE_RULE_MASK) { case AML_FIELD_UPDATE_PRESERVE: /* * Check if update rule needs to be applied (not if mask is all * ones) The left shift drops the bits we want to ignore. */ if ((~Mask << (ACPI_MUL_8 (sizeof (Mask)) - ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth))) != 0) { /* * Read the current contents of the byte/word/dword containing * the field, and merge with the new field value. */ Status = AcpiExFieldDatumIo (ObjDesc, FieldDatumByteOffset, &CurrentValue, ACPI_READ); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } MergedValue |= (CurrentValue & ~Mask); } break; case AML_FIELD_UPDATE_WRITE_AS_ONES: /* Set positions outside the field to all ones */ MergedValue |= ~Mask; break; case AML_FIELD_UPDATE_WRITE_AS_ZEROS: /* Set positions outside the field to all zeros */ MergedValue &= Mask; break; default: ACPI_ERROR ((AE_INFO, "Unknown UpdateRule value: %X", (ObjDesc->CommonField.FieldFlags & AML_FIELD_UPDATE_RULE_MASK))); return_ACPI_STATUS (AE_AML_OPERAND_VALUE); } } ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n", ACPI_FORMAT_UINT64 (Mask), FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth, ACPI_FORMAT_UINT64 (FieldValue), ACPI_FORMAT_UINT64 (MergedValue))); /* Write the merged value */ Status = AcpiExFieldDatumIo (ObjDesc, FieldDatumByteOffset, &MergedValue, ACPI_WRITE); return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExExtractFromField * * PARAMETERS: ObjDesc - Field to be read * Buffer - Where to store the field data * BufferLength - Length of Buffer * * RETURN: Status * * DESCRIPTION: Retrieve the current value of the given field * ******************************************************************************/ ACPI_STATUS AcpiExExtractFromField ( ACPI_OPERAND_OBJECT *ObjDesc, void *Buffer, UINT32 BufferLength) { ACPI_STATUS Status; ACPI_INTEGER RawDatum; ACPI_INTEGER MergedDatum; UINT32 FieldOffset = 0; UINT32 BufferOffset = 0; UINT32 BufferTailBits; UINT32 DatumCount; UINT32 FieldDatumCount; UINT32 i; ACPI_FUNCTION_TRACE (ExExtractFromField); /* Validate target buffer and clear it */ if (BufferLength < ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength)) { ACPI_ERROR ((AE_INFO, "Field size %X (bits) is too large for buffer (%X)", ObjDesc->CommonField.BitLength, BufferLength)); return_ACPI_STATUS (AE_BUFFER_OVERFLOW); } ACPI_MEMSET (Buffer, 0, BufferLength); /* Compute the number of datums (access width data items) */ DatumCount = ACPI_ROUND_UP_TO ( ObjDesc->CommonField.BitLength, ObjDesc->CommonField.AccessBitWidth); FieldDatumCount = ACPI_ROUND_UP_TO ( ObjDesc->CommonField.BitLength + ObjDesc->CommonField.StartFieldBitOffset, ObjDesc->CommonField.AccessBitWidth); /* Priming read from the field */ Status = AcpiExFieldDatumIo (ObjDesc, FieldOffset, &RawDatum, ACPI_READ); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset; /* Read the rest of the field */ for (i = 1; i < FieldDatumCount; i++) { /* Get next input datum from the field */ FieldOffset += ObjDesc->CommonField.AccessByteWidth; Status = AcpiExFieldDatumIo (ObjDesc, FieldOffset, &RawDatum, ACPI_READ); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* * Merge with previous datum if necessary. * * Note: Before the shift, check if the shift value will be larger than * the integer size. If so, there is no need to perform the operation. * This avoids the differences in behavior between different compilers * concerning shift values larger than the target data width. */ if ((ObjDesc->CommonField.AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset) < ACPI_INTEGER_BIT_SIZE) { MergedDatum |= RawDatum << (ObjDesc->CommonField.AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset); } if (i == DatumCount) { break; } /* Write merged datum to target buffer */ ACPI_MEMCPY (((char *) Buffer) + BufferOffset, &MergedDatum, ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, BufferLength - BufferOffset)); BufferOffset += ObjDesc->CommonField.AccessByteWidth; MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset; } /* Mask off any extra bits in the last datum */ BufferTailBits = ObjDesc->CommonField.BitLength % ObjDesc->CommonField.AccessBitWidth; if (BufferTailBits) { MergedDatum &= ACPI_MASK_BITS_ABOVE (BufferTailBits); } /* Write the last datum to the buffer */ ACPI_MEMCPY (((char *) Buffer) + BufferOffset, &MergedDatum, ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, BufferLength - BufferOffset)); return_ACPI_STATUS (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiExInsertIntoField * * PARAMETERS: ObjDesc - Field to be written * Buffer - Data to be written * BufferLength - Length of Buffer * * RETURN: Status * * DESCRIPTION: Store the Buffer contents into the given field * ******************************************************************************/ ACPI_STATUS AcpiExInsertIntoField ( ACPI_OPERAND_OBJECT *ObjDesc, void *Buffer, UINT32 BufferLength) { ACPI_STATUS Status; ACPI_INTEGER Mask; ACPI_INTEGER WidthMask; ACPI_INTEGER MergedDatum; ACPI_INTEGER RawDatum = 0; UINT32 FieldOffset = 0; UINT32 BufferOffset = 0; UINT32 BufferTailBits; UINT32 DatumCount; UINT32 FieldDatumCount; UINT32 i; UINT32 RequiredLength; void *NewBuffer; ACPI_FUNCTION_TRACE (ExInsertIntoField); /* Validate input buffer */ NewBuffer = NULL; RequiredLength = ACPI_ROUND_BITS_UP_TO_BYTES ( ObjDesc->CommonField.BitLength); /* * 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. */ if (BufferLength < RequiredLength) { /* We need to create a new buffer */ NewBuffer = ACPI_ALLOCATE_ZEROED (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, BufferLength); Buffer = NewBuffer; BufferLength = RequiredLength; } /* * Create the bitmasks used for bit insertion. * Note: This if/else is used to bypass compiler differences with the * shift operator */ if (ObjDesc->CommonField.AccessBitWidth == ACPI_INTEGER_BIT_SIZE) { WidthMask = ACPI_INTEGER_MAX; } else { WidthMask = ACPI_MASK_BITS_ABOVE (ObjDesc->CommonField.AccessBitWidth); } Mask = WidthMask & ACPI_MASK_BITS_BELOW (ObjDesc->CommonField.StartFieldBitOffset); /* Compute the number of datums (access width data items) */ DatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength, ObjDesc->CommonField.AccessBitWidth); FieldDatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength + ObjDesc->CommonField.StartFieldBitOffset, ObjDesc->CommonField.AccessBitWidth); /* Get initial Datum from the input buffer */ ACPI_MEMCPY (&RawDatum, Buffer, ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, BufferLength - BufferOffset)); MergedDatum = RawDatum << ObjDesc->CommonField.StartFieldBitOffset; /* Write the entire field */ for (i = 1; i < FieldDatumCount; i++) { /* Write merged datum to the target field */ MergedDatum &= Mask; Status = AcpiExWriteWithUpdateRule (ObjDesc, Mask, MergedDatum, FieldOffset); if (ACPI_FAILURE (Status)) { goto Exit; } FieldOffset += ObjDesc->CommonField.AccessByteWidth; /* * Start new output datum by merging with previous input datum * if necessary. * * Note: Before the shift, check if the shift value will be larger than * the integer size. If so, there is no need to perform the operation. * This avoids the differences in behavior between different compilers * concerning shift values larger than the target data width. */ if ((ObjDesc->CommonField.AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset) < ACPI_INTEGER_BIT_SIZE) { MergedDatum = RawDatum >> (ObjDesc->CommonField.AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset); } else { MergedDatum = 0; } Mask = WidthMask; if (i == DatumCount) { break; } /* Get the next input datum from the buffer */ BufferOffset += ObjDesc->CommonField.AccessByteWidth; ACPI_MEMCPY (&RawDatum, ((char *) Buffer) + BufferOffset, ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, BufferLength - BufferOffset)); MergedDatum |= RawDatum << ObjDesc->CommonField.StartFieldBitOffset; } /* Mask off any extra bits in the last datum */ BufferTailBits = (ObjDesc->CommonField.BitLength + ObjDesc->CommonField.StartFieldBitOffset) % ObjDesc->CommonField.AccessBitWidth; if (BufferTailBits) { Mask &= ACPI_MASK_BITS_ABOVE (BufferTailBits); } /* Write the last datum to the field */ MergedDatum &= Mask; Status = AcpiExWriteWithUpdateRule (ObjDesc, Mask, MergedDatum, FieldOffset); Exit: /* Free temporary buffer if we used one */ if (NewBuffer) { ACPI_FREE (NewBuffer); } return_ACPI_STATUS (Status); }