/****************************************************************************** * * Module Name: exfldio - Aml Field I/O * $Revision: 57 $ * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999, 2000, 2001, 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 "acinterp.h" #include "amlcode.h" #include "acnamesp.h" #include "achware.h" #include "acevents.h" #include "acdispat.h" #define _COMPONENT ACPI_EXECUTER MODULE_NAME ("exfldio") /******************************************************************************* * * FUNCTION: AcpiExSetupField * * PARAMETERS: *ObjDesc - Field to be read or written * FieldDatumByteOffset - Current offset into the field * * RETURN: Status * * DESCRIPTION: Common processing for AcpiExExtractFromField and * AcpiExInsertIntoField * ******************************************************************************/ ACPI_STATUS AcpiExSetupField ( ACPI_OPERAND_OBJECT *ObjDesc, UINT32 FieldDatumByteOffset) { ACPI_STATUS Status = AE_OK; ACPI_OPERAND_OBJECT *RgnDesc; FUNCTION_TRACE ("ExSetupField"); /* Parameter validation */ RgnDesc = ObjDesc->CommonField.RegionObj; if (!ObjDesc || !RgnDesc) { DEBUG_PRINTP (ACPI_ERROR, ("Internal error - null handle\n")); return_ACPI_STATUS (AE_AML_NO_OPERAND); } if (ACPI_TYPE_REGION != RgnDesc->Common.Type) { DEBUG_PRINTP (ACPI_ERROR, ("Needed Region, found type %x %s\n", RgnDesc->Common.Type, AcpiUtGetTypeName (RgnDesc->Common.Type))); 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->Region.Flags & AOPOBJ_DATA_VALID)) { Status = AcpiDsGetRegionArguments (RgnDesc); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } } /* * 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 (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. */ DEBUG_PRINTP (ACPI_ERROR, ("Field access width (%d bytes) too large for region size (%X)\n", ObjDesc->CommonField.AccessByteWidth, RgnDesc->Region.Length)); } /* * Offset rounded up to next multiple of field width * exceeds region length, indicate an error */ DEBUG_PRINTP (ACPI_ERROR, ("Field base+offset+width %X+%X+%X exceeds region size (%X bytes) field=%p region=%p\n", ObjDesc->CommonField.BaseByteOffset, FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth, RgnDesc->Region.Length, ObjDesc, RgnDesc)); return_ACPI_STATUS (AE_AML_REGION_LIMIT); } return_ACPI_STATUS (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiExReadFieldDatum * * PARAMETERS: *ObjDesc - Field to be read * *Value - Where to store value (must be 32 bits) * * RETURN: Status * * DESCRIPTION: Retrieve the value of the given field * ******************************************************************************/ ACPI_STATUS AcpiExReadFieldDatum ( ACPI_OPERAND_OBJECT *ObjDesc, UINT32 FieldDatumByteOffset, UINT32 *Value) { ACPI_STATUS Status; ACPI_OPERAND_OBJECT *RgnDesc; ACPI_PHYSICAL_ADDRESS Address; UINT32 LocalValue; FUNCTION_TRACE_U32 ("ExReadFieldDatum", FieldDatumByteOffset); if (!Value) { LocalValue = 0; Value = &LocalValue; /* support reads without saving value */ } /* Clear the entire return buffer first, [Very Important!] */ *Value = 0; /* * BufferFields - Read from a Buffer * Other Fields - Read from a Operation Region. */ switch (ObjDesc->Common.Type) { case ACPI_TYPE_BUFFER_FIELD: /* * For BufferFields, we only need to copy the data from the * source buffer. Length is the field width in bytes. */ MEMCPY (Value, (ObjDesc->BufferField.BufferObj)->Buffer.Pointer + ObjDesc->BufferField.BaseByteOffset + FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth); Status = AE_OK; break; case INTERNAL_TYPE_REGION_FIELD: case INTERNAL_TYPE_BANK_FIELD: /* * For other fields, we need to go through an Operation Region * (Only types that will get here are RegionFields and BankFields) */ Status = AcpiExSetupField (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; Address = RgnDesc->Region.Address + ObjDesc->CommonField.BaseByteOffset + FieldDatumByteOffset; DEBUG_PRINTP (TRACE_BFIELD, ("Region %s(%X) width %X base:off %X:%X at %08lX\n", AcpiUtGetRegionName (RgnDesc->Region.SpaceId), RgnDesc->Region.SpaceId, ObjDesc->CommonField.AccessBitWidth, ObjDesc->CommonField.BaseByteOffset, FieldDatumByteOffset, Address)); /* Invoke the appropriate AddressSpace/OpRegion handler */ Status = AcpiEvAddressSpaceDispatch (RgnDesc, ACPI_READ_ADR_SPACE, Address, ObjDesc->CommonField.AccessBitWidth, Value); if (Status == AE_NOT_IMPLEMENTED) { DEBUG_PRINTP (ACPI_ERROR, ("Region %s(%X) not implemented\n", AcpiUtGetRegionName (RgnDesc->Region.SpaceId), RgnDesc->Region.SpaceId)); } else if (Status == AE_NOT_EXIST) { DEBUG_PRINTP (ACPI_ERROR, ("Region %s(%X) has no handler\n", AcpiUtGetRegionName (RgnDesc->Region.SpaceId), RgnDesc->Region.SpaceId)); } break; default: DEBUG_PRINTP (ACPI_ERROR, ("%p, wrong source type - %s\n", ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type))); Status = AE_AML_INTERNAL; break; } DEBUG_PRINTP (TRACE_BFIELD, ("Returned value=%08lX \n", *Value)); return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExGetBufferDatum * * PARAMETERS: MergedDatum - Value to store * Buffer - Receiving buffer * ByteGranularity - 1/2/4 Granularity of the field * (aka Datum Size) * Offset - Datum offset into the buffer * * RETURN: none * * DESCRIPTION: Store the merged datum to the buffer according to the * byte granularity * ******************************************************************************/ static void AcpiExGetBufferDatum( UINT32 *Datum, void *Buffer, UINT32 ByteGranularity, UINT32 Offset) { switch (ByteGranularity) { case ACPI_FIELD_BYTE_GRANULARITY: *Datum = ((UINT8 *) Buffer) [Offset]; break; case ACPI_FIELD_WORD_GRANULARITY: MOVE_UNALIGNED16_TO_32 (Datum, &(((UINT16 *) Buffer) [Offset])); break; case ACPI_FIELD_DWORD_GRANULARITY: MOVE_UNALIGNED32_TO_32 (Datum, &(((UINT32 *) Buffer) [Offset])); break; } } /******************************************************************************* * * FUNCTION: AcpiExSetBufferDatum * * PARAMETERS: MergedDatum - Value to store * Buffer - Receiving buffer * ByteGranularity - 1/2/4 Granularity of the field * (aka Datum Size) * Offset - Datum offset into the buffer * * RETURN: none * * DESCRIPTION: Store the merged datum to the buffer according to the * byte granularity * ******************************************************************************/ static void AcpiExSetBufferDatum ( UINT32 MergedDatum, void *Buffer, UINT32 ByteGranularity, UINT32 Offset) { switch (ByteGranularity) { case ACPI_FIELD_BYTE_GRANULARITY: ((UINT8 *) Buffer) [Offset] = (UINT8) MergedDatum; break; case ACPI_FIELD_WORD_GRANULARITY: MOVE_UNALIGNED16_TO_16 (&(((UINT16 *) Buffer)[Offset]), &MergedDatum); break; case ACPI_FIELD_DWORD_GRANULARITY: MOVE_UNALIGNED32_TO_32 (&(((UINT32 *) Buffer)[Offset]), &MergedDatum); break; } } /******************************************************************************* * * FUNCTION: AcpiExExtractFromField * * PARAMETERS: *ObjDesc - Field to be read * *Value - Where to store value * * RETURN: Status * * DESCRIPTION: Retrieve the value of the given field * ******************************************************************************/ ACPI_STATUS AcpiExExtractFromField ( ACPI_OPERAND_OBJECT *ObjDesc, void *Buffer, UINT32 BufferLength) { ACPI_STATUS Status; UINT32 FieldDatumByteOffset; UINT32 DatumOffset; UINT32 PreviousRawDatum; UINT32 ThisRawDatum = 0; UINT32 MergedDatum = 0; UINT32 ByteFieldLength; UINT32 DatumCount; FUNCTION_TRACE ("ExExtractFromField"); /* * The field must fit within the caller's buffer */ ByteFieldLength = ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength); if (ByteFieldLength > BufferLength) { DEBUG_PRINTP (ACPI_INFO, ("Field size %X (bytes) too large for buffer (%X)\n", ByteFieldLength, BufferLength)); return_ACPI_STATUS (AE_BUFFER_OVERFLOW); } /* Convert field byte count to datum count, round up if necessary */ DatumCount = ROUND_UP_TO (ByteFieldLength, ObjDesc->CommonField.AccessByteWidth); DEBUG_PRINT (ACPI_INFO, ("ByteLen=%x, DatumLen=%x, BitGran=%x, ByteGran=%x\n", ByteFieldLength, DatumCount, ObjDesc->CommonField.AccessBitWidth, ObjDesc->CommonField.AccessByteWidth)); /* * Clear the caller's buffer (the whole buffer length as given) * This is very important, especially in the cases where a byte is read, * but the buffer is really a UINT32 (4 bytes). */ MEMSET (Buffer, 0, BufferLength); /* Read the first raw datum to prime the loop */ FieldDatumByteOffset = 0; DatumOffset= 0; Status = AcpiExReadFieldDatum (ObjDesc, FieldDatumByteOffset, &PreviousRawDatum); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* We might actually be done if the request fits in one datum */ if ((DatumCount == 1) && (ObjDesc->CommonField.AccessFlags & AFIELD_SINGLE_DATUM)) { /* 1) Shift the valid data bits down to start at bit 0 */ MergedDatum = (PreviousRawDatum >> ObjDesc->CommonField.StartFieldBitOffset); /* 2) Mask off any upper unused bits (bits not part of the field) */ if (ObjDesc->CommonField.EndBufferValidBits) { MergedDatum &= MASK_BITS_ABOVE (ObjDesc->CommonField.EndBufferValidBits); } /* Store the datum to the caller buffer */ AcpiExSetBufferDatum (MergedDatum, Buffer, ObjDesc->CommonField.AccessByteWidth, DatumOffset); return_ACPI_STATUS (AE_OK); } /* We need to get more raw data to complete one or more field data */ while (DatumOffset < DatumCount) { FieldDatumByteOffset += ObjDesc->CommonField.AccessByteWidth; /* * If the field is aligned on a byte boundary, we don't want * to perform a final read, since this would potentially read * past the end of the region. * * TBD: [Investigate] It may make more sense to just split the aligned * and non-aligned cases since the aligned case is so very simple, */ if ((ObjDesc->CommonField.StartFieldBitOffset != 0) || ((ObjDesc->CommonField.StartFieldBitOffset == 0) && (DatumOffset < (DatumCount -1)))) { /* * Get the next raw datum, it contains some or all bits * of the current field datum */ Status = AcpiExReadFieldDatum (ObjDesc, FieldDatumByteOffset, &ThisRawDatum); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } } /* * Create the (possibly) merged datum to be stored to the caller buffer */ if (ObjDesc->CommonField.StartFieldBitOffset == 0) { /* Field is not skewed and we can just copy the datum */ MergedDatum = PreviousRawDatum; } else { /* * Put together the appropriate bits of the two raw data to make a * single complete field datum * * 1) Normalize the first datum down to bit 0 */ MergedDatum = (PreviousRawDatum >> ObjDesc->CommonField.StartFieldBitOffset); /* 2) Insert the second datum "above" the first datum */ MergedDatum |= (ThisRawDatum << ObjDesc->CommonField.DatumValidBits); if ((DatumOffset >= (DatumCount -1))) { /* * This is the last iteration of the loop. We need to clear * any unused bits (bits that are not part of this field) that * came from the last raw datum before we store the final * merged datum into the caller buffer. */ if (ObjDesc->CommonField.EndBufferValidBits) { MergedDatum &= MASK_BITS_ABOVE (ObjDesc->CommonField.EndBufferValidBits); } } } /* * Store the merged field datum in the caller's buffer, according to * the granularity of the field (size of each datum). */ AcpiExSetBufferDatum (MergedDatum, Buffer, ObjDesc->CommonField.AccessByteWidth, DatumOffset); /* * Save the raw datum that was just acquired since it may contain bits * of the *next* field datum. Update offsets */ PreviousRawDatum = ThisRawDatum; DatumOffset++; } return_ACPI_STATUS (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiExWriteFieldDatum * * PARAMETERS: *ObjDesc - Field to be set * Value - Value to store * * RETURN: Status * * DESCRIPTION: Store the value into the given field * ******************************************************************************/ static ACPI_STATUS AcpiExWriteFieldDatum ( ACPI_OPERAND_OBJECT *ObjDesc, UINT32 FieldDatumByteOffset, UINT32 Value) { ACPI_STATUS Status = AE_OK; ACPI_OPERAND_OBJECT *RgnDesc = NULL; ACPI_PHYSICAL_ADDRESS Address; FUNCTION_TRACE_U32 ("ExWriteFieldDatum", FieldDatumByteOffset); /* * BufferFields - Read from a Buffer * Other Fields - Read from a Operation Region. */ switch (ObjDesc->Common.Type) { case ACPI_TYPE_BUFFER_FIELD: /* * For BufferFields, we only need to copy the data to the * target buffer. Length is the field width in bytes. */ MEMCPY ((ObjDesc->BufferField.BufferObj)->Buffer.Pointer + ObjDesc->BufferField.BaseByteOffset + FieldDatumByteOffset, &Value, ObjDesc->CommonField.AccessByteWidth); Status = AE_OK; break; case INTERNAL_TYPE_REGION_FIELD: case INTERNAL_TYPE_BANK_FIELD: /* * For other fields, we need to go through an Operation Region * (Only types that will get here are RegionFields and BankFields) */ Status = AcpiExSetupField (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; Address = RgnDesc->Region.Address + ObjDesc->CommonField.BaseByteOffset + FieldDatumByteOffset; DEBUG_PRINTP (TRACE_BFIELD, ("Store %X in Region %s(%X) at %p width %X\n", Value, AcpiUtGetRegionName (RgnDesc->Region.SpaceId), RgnDesc->Region.SpaceId, Address, ObjDesc->CommonField.AccessBitWidth)); /* Invoke the appropriate AddressSpace/OpRegion handler */ Status = AcpiEvAddressSpaceDispatch (RgnDesc, ACPI_WRITE_ADR_SPACE, Address, ObjDesc->CommonField.AccessBitWidth, &Value); if (Status == AE_NOT_IMPLEMENTED) { DEBUG_PRINTP (ACPI_ERROR, ("**** Region type %s(%X) not implemented\n", AcpiUtGetRegionName (RgnDesc->Region.SpaceId), RgnDesc->Region.SpaceId)); } else if (Status == AE_NOT_EXIST) { DEBUG_PRINTP (ACPI_ERROR, ("**** Region type %s(%X) does not have a handler\n", AcpiUtGetRegionName (RgnDesc->Region.SpaceId), RgnDesc->Region.SpaceId)); } break; default: DEBUG_PRINTP (ACPI_ERROR, ("%p, wrong source type - %s\n", ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type))); Status = AE_AML_INTERNAL; break; } DEBUG_PRINTP (TRACE_BFIELD, ("Value written=%08lX \n", Value)); return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExWriteFieldDatumWithUpdateRule * * PARAMETERS: *ObjDesc - Field to be set * Value - Value to store * * RETURN: Status * * DESCRIPTION: Apply the field update rule to a field write * ******************************************************************************/ static ACPI_STATUS AcpiExWriteFieldDatumWithUpdateRule ( ACPI_OPERAND_OBJECT *ObjDesc, UINT32 Mask, UINT32 FieldValue, UINT32 FieldDatumByteOffset) { ACPI_STATUS Status = AE_OK; UINT32 MergedValue; UINT32 CurrentValue; FUNCTION_TRACE ("ExWriteFieldDatumWithUpdateRule"); /* 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_UINT32_MAX) { /* Decode the update rule */ switch (ObjDesc->CommonField.UpdateRule) { case 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 << (sizeof (Mask) * 8 - ObjDesc->CommonField.AccessBitWidth)) != 0) { /* * Read the current contents of the byte/word/dword containing * the field, and merge with the new field value. */ Status = AcpiExReadFieldDatum (ObjDesc, FieldDatumByteOffset, &CurrentValue); MergedValue |= (CurrentValue & ~Mask); } break; case UPDATE_WRITE_AS_ONES: /* Set positions outside the field to all ones */ MergedValue |= ~Mask; break; case UPDATE_WRITE_AS_ZEROS: /* Set positions outside the field to all zeros */ MergedValue &= Mask; break; default: DEBUG_PRINT (ACPI_ERROR, ("WriteWithUpdateRule: Unknown UpdateRule setting: %x\n", ObjDesc->CommonField.UpdateRule)); return_ACPI_STATUS (AE_AML_OPERAND_VALUE); break; } } /* Write the merged value */ Status = AcpiExWriteFieldDatum (ObjDesc, FieldDatumByteOffset, MergedValue); DEBUG_PRINTP (TRACE_BFIELD, ("Mask %X DatumOffset %X Value %X, MergedValue %X\n", Mask, FieldDatumByteOffset, FieldValue, MergedValue)); return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExInsertIntoField * * PARAMETERS: *ObjDesc - Field to be set * Buffer - Value to store * * RETURN: Status * * DESCRIPTION: Store the value into the given field * ******************************************************************************/ ACPI_STATUS AcpiExInsertIntoField ( ACPI_OPERAND_OBJECT *ObjDesc, void *Buffer, UINT32 BufferLength) { ACPI_STATUS Status; UINT32 FieldDatumByteOffset; UINT32 DatumOffset; UINT32 Mask; UINT32 MergedDatum; UINT32 PreviousRawDatum; UINT32 ThisRawDatum; UINT32 ByteFieldLength; UINT32 DatumCount; FUNCTION_TRACE ("ExInsertIntoField"); /* * Incoming buffer must be at least as long as the field, we do not * allow "partial" field writes. We do not care if the buffer is * larger than the field, this typically happens when an integer is * written to a field that is actually smaller than an integer. */ ByteFieldLength = ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength); if (BufferLength < ByteFieldLength) { DEBUG_PRINTP (ACPI_INFO, ("Buffer length %X too small for field %X\n", BufferLength, ByteFieldLength)); /* TBD: Need a better error code */ return_ACPI_STATUS (AE_BUFFER_OVERFLOW); } /* Convert byte count to datum count, round up if necessary */ DatumCount = ROUND_UP_TO (ByteFieldLength, ObjDesc->CommonField.AccessByteWidth); DEBUG_PRINT (ACPI_INFO, ("ByteLen=%x, DatumLen=%x, BitGran=%x, ByteGran=%x\n", ByteFieldLength, DatumCount, ObjDesc->CommonField.AccessBitWidth, ObjDesc->CommonField.AccessByteWidth)); /* * Break the request into up to three parts (similar to an I/O request): * 1) non-aligned part at start * 2) aligned part in middle * 3) non-aligned part at the end */ FieldDatumByteOffset = 0; DatumOffset= 0; /* Get a single datum from the caller's buffer */ AcpiExGetBufferDatum (&PreviousRawDatum, Buffer, ObjDesc->CommonField.AccessByteWidth, DatumOffset); /* * Part1: * Write a partial field datum if field does not begin on a datum boundary * Note: The code in this section also handles the aligned case * * Construct Mask with 1 bits where the field is, 0 bits elsewhere * (Only the bottom 5 bits of BitLength are valid for a shift operation) * * Mask off bits that are "below" the field (if any) */ Mask = MASK_BITS_BELOW (ObjDesc->CommonField.StartFieldBitOffset); /* If the field fits in one datum, may need to mask upper bits */ if ((ObjDesc->CommonField.AccessFlags & AFIELD_SINGLE_DATUM) && ObjDesc->CommonField.EndFieldValidBits) { /* There are bits above the field, mask them off also */ Mask &= MASK_BITS_ABOVE (ObjDesc->CommonField.EndFieldValidBits); } /* Shift and mask the value into the field position */ MergedDatum = (PreviousRawDatum << ObjDesc->CommonField.StartFieldBitOffset); MergedDatum &= Mask; /* Apply the update rule (if necessary) and write the datum to the field */ Status = AcpiExWriteFieldDatumWithUpdateRule (ObjDesc, Mask, MergedDatum, FieldDatumByteOffset); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* If the entire field fits within one datum, we are done. */ if ((DatumCount == 1) && (ObjDesc->CommonField.AccessFlags & AFIELD_SINGLE_DATUM)) { return_ACPI_STATUS (AE_OK); } /* * Part2: * Write the aligned data. * * We don't need to worry about the update rule for these data, because * all of the bits in each datum are part of the field. * * The last datum must be special cased because it might contain bits * that are not part of the field -- therefore the "update rule" must be * applied in Part3 below. */ while (DatumOffset < DatumCount) { DatumOffset++; FieldDatumByteOffset += ObjDesc->CommonField.AccessByteWidth; /* * Get the next raw buffer datum. It may contain bits of the previous * field datum */ AcpiExGetBufferDatum (&ThisRawDatum, Buffer, ObjDesc->CommonField.AccessByteWidth, DatumOffset); /* Create the field datum based on the field alignment */ if (ObjDesc->CommonField.StartFieldBitOffset != 0) { /* * Put together appropriate bits of the two raw buffer data to make * a single complete field datum */ MergedDatum = (PreviousRawDatum >> ObjDesc->CommonField.DatumValidBits) | (ThisRawDatum << ObjDesc->CommonField.StartFieldBitOffset); } else { /* Field began aligned on datum boundary */ MergedDatum = ThisRawDatum; } /* * Special handling for the last datum if the field does NOT end on * a datum boundary. Update Rule must be applied to the bits outside * the field. */ if ((DatumOffset == DatumCount) && ObjDesc->CommonField.EndFieldValidBits) { /* * Part3: * This is the last datum and the field does not end on a datum boundary. * Build the partial datum and write with the update rule. */ /* Mask off the unused bits above (after) the end-of-field */ Mask = MASK_BITS_ABOVE (ObjDesc->CommonField.EndFieldValidBits); MergedDatum &= Mask; /* Write the last datum with the update rule */ Status = AcpiExWriteFieldDatumWithUpdateRule (ObjDesc, Mask, MergedDatum, FieldDatumByteOffset); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } } else { /* Normal case -- write the completed datum */ Status = AcpiExWriteFieldDatum (ObjDesc, FieldDatumByteOffset, MergedDatum); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } } /* * Save the most recent datum since it may contain bits of the *next* * field datum. Update current byte offset. */ PreviousRawDatum = ThisRawDatum; } return_ACPI_STATUS (Status); }