diff options
Diffstat (limited to 'sys/contrib/dev/acpica/exfldio.c')
| -rw-r--r-- | sys/contrib/dev/acpica/exfldio.c | 857 |
1 files changed, 857 insertions, 0 deletions
diff --git a/sys/contrib/dev/acpica/exfldio.c b/sys/contrib/dev/acpica/exfldio.c new file mode 100644 index 0000000000000..ce7bb2873d139 --- /dev/null +++ b/sys/contrib/dev/acpica/exfldio.c @@ -0,0 +1,857 @@ +/****************************************************************************** + * + * Module Name: amfldio - Aml Field I/O + * $Revision: 28 $ + * + *****************************************************************************/ + +/****************************************************************************** + * + * 1. Copyright Notice + * + * Some or all of this work - Copyright (c) 1999, 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 __AMFLDIO_C__ + +#include "acpi.h" +#include "acinterp.h" +#include "amlcode.h" +#include "acnamesp.h" +#include "achware.h" +#include "acevents.h" + + +#define _COMPONENT INTERPRETER + MODULE_NAME ("amfldio") + + +/******************************************************************************* + * + * FUNCTION: AcpiAmlReadFieldData + * + * PARAMETERS: *ObjDesc - Field to be read + * *Value - Where to store value + * FieldBitWidth - Field Width in bits (8, 16, or 32) + * + * RETURN: Status + * + * DESCRIPTION: Retrieve the value of the given field + * + ******************************************************************************/ + +ACPI_STATUS +AcpiAmlReadFieldData ( + ACPI_OPERAND_OBJECT *ObjDesc, + UINT32 FieldByteOffset, + UINT32 FieldBitWidth, + UINT32 *Value) +{ + ACPI_STATUS Status; + ACPI_OPERAND_OBJECT *RgnDesc = NULL; + ACPI_INTEGER Address; + UINT32 LocalValue = 0; + UINT32 FieldByteWidth; + + + FUNCTION_TRACE ("AmlReadFieldData"); + + + /* ObjDesc is validated by callers */ + + if (ObjDesc) + { + RgnDesc = ObjDesc->Field.Container; + } + + + FieldByteWidth = DIV_8 (FieldBitWidth); + Status = AcpiAmlSetupField (ObjDesc, RgnDesc, FieldBitWidth); + if (ACPI_FAILURE (Status)) + { + return_ACPI_STATUS (Status); + } + + /* SetupField validated RgnDesc and FieldBitWidth */ + + if (!Value) + { + Value = &LocalValue; /* support reads without saving value */ + } + + + /* + * Set offset to next multiple of field width, + * add region base address and offset within the field + */ + Address = RgnDesc->Region.Address + + (ObjDesc->Field.Offset * FieldByteWidth) + + FieldByteOffset; + + + if (RgnDesc->Region.SpaceId >= NUM_REGION_TYPES) + { + DEBUG_PRINT (TRACE_OPREGION, + ("AmlReadFieldData: **** Unknown OpRegion SpaceID %d at %08lx width %d\n", + RgnDesc->Region.SpaceId, Address, FieldBitWidth)); + } + + else + { + DEBUG_PRINT (TRACE_OPREGION, + ("AmlReadFieldData: OpRegion %s at %08lx width %d\n", + AcpiGbl_RegionTypes[RgnDesc->Region.SpaceId], Address, + FieldBitWidth)); + } + + + /* Invoke the appropriate AddressSpace/OpRegion handler */ + + Status = AcpiEvAddressSpaceDispatch (RgnDesc, ADDRESS_SPACE_READ, + Address, FieldBitWidth, Value); + + if (Status == AE_NOT_IMPLEMENTED) + { + DEBUG_PRINT (ACPI_ERROR, + ("AmlReadFieldData: **** OpRegion type %s not implemented\n", + AcpiGbl_RegionTypes[RgnDesc->Region.SpaceId])); + } + + else if (Status == AE_NOT_EXIST) + { + DEBUG_PRINT (ACPI_ERROR, + ("AmlReadFieldData: **** Unknown OpRegion SpaceID %d\n", + RgnDesc->Region.SpaceId)); + } + + DEBUG_PRINT (TRACE_OPREGION, + ("AmlReadField: Returned value=%08lx \n", *Value)); + + return_ACPI_STATUS (Status); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiAmlReadField + * + * PARAMETERS: *ObjDesc - Field to be read + * *Value - Where to store value + * FieldBitWidth - Field Width in bits (8, 16, or 32) + * + * RETURN: Status + * + * DESCRIPTION: Retrieve the value of the given field + * + ******************************************************************************/ + +ACPI_STATUS +AcpiAmlReadField ( + ACPI_OPERAND_OBJECT *ObjDesc, + void *Buffer, + UINT32 BufferLength, + UINT32 ByteLength, + UINT32 DatumLength, + UINT32 BitGranularity, + UINT32 ByteGranularity) +{ + ACPI_STATUS Status; + UINT32 ThisFieldByteOffset; + UINT32 ThisFieldDatumOffset; + UINT32 PreviousRawDatum; + UINT32 ThisRawDatum; + UINT32 ValidFieldBits; + UINT32 Mask; + UINT32 MergedDatum = 0; + + + FUNCTION_TRACE ("AmlReadField"); + + /* + * 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 */ + + ThisFieldByteOffset = 0; + ThisFieldDatumOffset= 0; + + Status = AcpiAmlReadFieldData (ObjDesc, ThisFieldByteOffset, BitGranularity, + &PreviousRawDatum); + if (ACPI_FAILURE (Status)) + { + goto Cleanup; + } + + /* We might actually be done if the request fits in one datum */ + + if ((DatumLength == 1) && + ((ObjDesc->Field.BitOffset + ObjDesc->FieldUnit.Length) <= + (UINT16) BitGranularity)) + { + MergedDatum = PreviousRawDatum; + + MergedDatum = (MergedDatum >> ObjDesc->Field.BitOffset); + + ValidFieldBits = ObjDesc->FieldUnit.Length % BitGranularity; + if (ValidFieldBits) + { + Mask = (((UINT32) 1 << ValidFieldBits) - (UINT32) 1); + MergedDatum &= Mask; + } + + + /* + * Place the MergedDatum into the proper format and return buffer + * field + */ + + switch (ByteGranularity) + { + case 1: + ((UINT8 *) Buffer) [ThisFieldDatumOffset] = (UINT8) MergedDatum; + break; + + case 2: + MOVE_UNALIGNED16_TO_16 (&(((UINT16 *) Buffer)[ThisFieldDatumOffset]), &MergedDatum); + break; + + case 4: + MOVE_UNALIGNED32_TO_32 (&(((UINT32 *) Buffer)[ThisFieldDatumOffset]), &MergedDatum); + break; + } + + ThisFieldByteOffset = 1; + ThisFieldDatumOffset = 1; + } + + else + { + /* We need to get more raw data to complete one or more field data */ + + while (ThisFieldDatumOffset < DatumLength) + { + /* + * Get the next raw datum, it contains bits of the current + * field datum + */ + + Status = AcpiAmlReadFieldData (ObjDesc, + ThisFieldByteOffset + ByteGranularity, + BitGranularity, &ThisRawDatum); + if (ACPI_FAILURE (Status)) + { + goto Cleanup; + } + + /* Before merging the data, make sure the unused bits are clear */ + + switch (ByteGranularity) + { + case 1: + ThisRawDatum &= 0x000000FF; + PreviousRawDatum &= 0x000000FF; + break; + + case 2: + ThisRawDatum &= 0x0000FFFF; + PreviousRawDatum &= 0x0000FFFF; + break; + } + + /* + * Put together bits of the two raw data to make a complete + * field datum + */ + + + if (ObjDesc->Field.BitOffset != 0) + { + MergedDatum = + (PreviousRawDatum >> ObjDesc->Field.BitOffset) | + (ThisRawDatum << (BitGranularity - ObjDesc->Field.BitOffset)); + } + + else + { + MergedDatum = PreviousRawDatum; + } + + /* + * Prepare the merged datum for storing into the caller's + * buffer. It is possible to have a 32-bit buffer + * (ByteGranularity == 4), but a ObjDesc->Field.Length + * of 8 or 16, meaning that the upper bytes of merged data + * are undesired. This section fixes that. + */ + switch (ObjDesc->Field.Length) + { + case 8: + MergedDatum &= 0x000000FF; + break; + + case 16: + MergedDatum &= 0x0000FFFF; + break; + } + + /* + * Now store the datum in the caller's buffer, according to + * the data type + */ + switch (ByteGranularity) + { + case 1: + ((UINT8 *) Buffer) [ThisFieldDatumOffset] = (UINT8) MergedDatum; + break; + + case 2: + MOVE_UNALIGNED16_TO_16 (&(((UINT16 *) Buffer) [ThisFieldDatumOffset]), &MergedDatum); + break; + + case 4: + MOVE_UNALIGNED32_TO_32 (&(((UINT32 *) Buffer) [ThisFieldDatumOffset]), &MergedDatum); + break; + } + + /* + * Save the most recent datum since it contains bits of + * the *next* field datum + */ + + PreviousRawDatum = ThisRawDatum; + + ThisFieldByteOffset += ByteGranularity; + ThisFieldDatumOffset++; + + } /* while */ + } + +Cleanup: + + return_ACPI_STATUS (Status); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiAmlWriteFieldData + * + * PARAMETERS: *ObjDesc - Field to be set + * Value - Value to store + * FieldBitWidth - Field Width in bits (8, 16, or 32) + * + * RETURN: Status + * + * DESCRIPTION: Store the value into the given field + * + ******************************************************************************/ + +ACPI_STATUS +AcpiAmlWriteFieldData ( + ACPI_OPERAND_OBJECT *ObjDesc, + UINT32 FieldByteOffset, + UINT32 FieldBitWidth, + UINT32 Value) +{ + ACPI_STATUS Status = AE_OK; + ACPI_OPERAND_OBJECT *RgnDesc = NULL; + ACPI_INTEGER Address; + UINT32 FieldByteWidth; + + + FUNCTION_TRACE ("AmlWriteFieldData"); + + + /* ObjDesc is validated by callers */ + + if (ObjDesc) + { + RgnDesc = ObjDesc->Field.Container; + } + + FieldByteWidth = DIV_8 (FieldBitWidth); + Status = AcpiAmlSetupField (ObjDesc, RgnDesc, FieldBitWidth); + if (ACPI_FAILURE (Status)) + { + return_ACPI_STATUS (Status); + } + + + /* + * Set offset to next multiple of field width, + * add region base address and offset within the field + */ + Address = RgnDesc->Region.Address + + (ObjDesc->Field.Offset * FieldByteWidth) + + FieldByteOffset; + + + if (RgnDesc->Region.SpaceId >= NUM_REGION_TYPES) + { + DEBUG_PRINT (TRACE_OPREGION, + ("AmlWriteField: **** Store %lx in unknown OpRegion SpaceID %d at %p width %d ** \n", + Value, RgnDesc->Region.SpaceId, Address, FieldBitWidth)); + } + else + { + DEBUG_PRINT (TRACE_OPREGION, + ("AmlWriteField: Store %lx in OpRegion %s at %p width %d\n", + Value, AcpiGbl_RegionTypes[RgnDesc->Region.SpaceId], Address, + FieldBitWidth)); + } + + /* Invoke the appropriate AddressSpace/OpRegion handler */ + + Status = AcpiEvAddressSpaceDispatch (RgnDesc, ADDRESS_SPACE_WRITE, + Address, FieldBitWidth, &Value); + + if (Status == AE_NOT_IMPLEMENTED) + { + DEBUG_PRINT (ACPI_ERROR, + ("AmlWriteField: **** OpRegion type %s not implemented\n", + AcpiGbl_RegionTypes[RgnDesc->Region.SpaceId])); + } + + else if (Status == AE_NOT_EXIST) + { + DEBUG_PRINT (ACPI_ERROR, + ("AmlWriteField: **** Unknown OpRegion SpaceID %x\n", + RgnDesc->Region.SpaceId)); + } + + return_ACPI_STATUS (Status); +} + + +/***************************************************************************** + * + * FUNCTION: AcpiAmlWriteFieldDataWithUpdateRule + * + * PARAMETERS: *ObjDesc - Field to be set + * Value - Value to store + * FieldBitWidth - Field Width in bits (8, 16, or 32) + * + * RETURN: Status + * + * DESCRIPTION: Apply the field update rule to a field write + * + ****************************************************************************/ + +ACPI_STATUS +AcpiAmlWriteFieldDataWithUpdateRule ( + ACPI_OPERAND_OBJECT *ObjDesc, + UINT32 Mask, + UINT32 FieldValue, + UINT32 ThisFieldByteOffset, + UINT32 BitGranularity) +{ + ACPI_STATUS Status = AE_OK; + UINT32 MergedValue; + UINT32 CurrentValue; + + + /* Start with the new bits */ + + MergedValue = FieldValue; + + /* Check if update rule needs to be applied (not if mask is all ones) */ + + + /* Decode the update rule */ + + switch (ObjDesc->Field.UpdateRule) + { + + case UPDATE_PRESERVE: + + /* + * Read the current contents of the byte/word/dword containing + * the field, and merge with the new field value. + */ + Status = AcpiAmlReadFieldData (ObjDesc, ThisFieldByteOffset, + BitGranularity, &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, + ("WriteFieldDataWithUpdateRule: Unknown UpdateRule setting: %x\n", + ObjDesc->Field.UpdateRule)); + Status = AE_AML_OPERAND_VALUE; + } + + + /* Write the merged value */ + + if (ACPI_SUCCESS (Status)) + { + Status = AcpiAmlWriteFieldData (ObjDesc, ThisFieldByteOffset, + BitGranularity, MergedValue); + } + + return (Status); +} + + +/***************************************************************************** + * + * FUNCTION: AcpiAmlWriteField + * + * PARAMETERS: *ObjDesc - Field to be set + * Value - Value to store + * FieldBitWidth - Field Width in bits (8, 16, or 32) + * + * RETURN: Status + * + * DESCRIPTION: Store the value into the given field + * + ****************************************************************************/ + +ACPI_STATUS +AcpiAmlWriteField ( + ACPI_OPERAND_OBJECT *ObjDesc, + void *Buffer, + UINT32 BufferLength, + UINT32 ByteLength, + UINT32 DatumLength, + UINT32 BitGranularity, + UINT32 ByteGranularity) +{ + ACPI_STATUS Status; + UINT32 ThisFieldByteOffset; + UINT32 ThisFieldDatumOffset; + UINT32 Mask; + UINT32 MergedDatum; + UINT32 PreviousRawDatum; + UINT32 ThisRawDatum; + UINT32 FieldValue; + UINT32 ValidFieldBits; + + + FUNCTION_TRACE ("AmlWriteField"); + + + /* + * Break the request into up to three parts: + * non-aligned part at start, aligned part in middle, non-aligned part + * at end --- Just like an I/O request --- + */ + + ThisFieldByteOffset = 0; + ThisFieldDatumOffset= 0; + + /* Get a datum */ + + switch (ByteGranularity) + { + case 1: + PreviousRawDatum = ((UINT8 *) Buffer) [ThisFieldDatumOffset]; + break; + + case 2: + MOVE_UNALIGNED16_TO_32 (&PreviousRawDatum, &(((UINT16 *) Buffer) [ThisFieldDatumOffset])); + break; + + case 4: + MOVE_UNALIGNED32_TO_32 (&PreviousRawDatum, &(((UINT32 *) Buffer) [ThisFieldDatumOffset])); + break; + + default: + DEBUG_PRINT (ACPI_ERROR, ("AmlWriteField: Invalid granularity: %x\n", + ByteGranularity)); + Status = AE_AML_OPERAND_VALUE; + goto Cleanup; + } + + + /* + * Write a partial field datum if field does not begin on a datum boundary + * + * Construct Mask with 1 bits where the field is, 0 bits elsewhere + * + * 1) Bits above the field + */ + + Mask = (((UINT32)(-1)) << (UINT32)ObjDesc->Field.BitOffset); + + /* 2) Only the bottom 5 bits are valid for a shift operation. */ + + if ((ObjDesc->Field.BitOffset + ObjDesc->FieldUnit.Length) < 32) + { + /* Bits above the field */ + + Mask &= (~(((UINT32)(-1)) << ((UINT32)ObjDesc->Field.BitOffset + + (UINT32)ObjDesc->FieldUnit.Length))); + } + + /* 3) Shift and mask the value into the field position */ + + FieldValue = (PreviousRawDatum << ObjDesc->Field.BitOffset) & Mask; + + Status = AcpiAmlWriteFieldDataWithUpdateRule (ObjDesc, Mask, FieldValue, + ThisFieldByteOffset, + BitGranularity); + if (ACPI_FAILURE (Status)) + { + goto Cleanup; + } + + + /* If the field fits within one datum, we are done. */ + + if ((DatumLength == 1) && + ((ObjDesc->Field.BitOffset + ObjDesc->FieldUnit.Length) <= + (UINT16) BitGranularity)) + { + goto Cleanup; + } + + /* + * We don't need to worry about the update rule for these data, because + * all of the bits are part of the field. + * + * Can't write the last datum, however, because it might contain bits that + * are not part of the field -- the update rule must be applied. + */ + + while (ThisFieldDatumOffset < (DatumLength - 1)) + { + ThisFieldDatumOffset++; + + /* Get the next raw datum, it contains bits of the current field datum... */ + + switch (ByteGranularity) + { + case 1: + ThisRawDatum = ((UINT8 *) Buffer) [ThisFieldDatumOffset]; + break; + + case 2: + MOVE_UNALIGNED16_TO_32 (&ThisRawDatum, &(((UINT16 *) Buffer) [ThisFieldDatumOffset])); + break; + + case 4: + MOVE_UNALIGNED32_TO_32 (&ThisRawDatum, &(((UINT32 *) Buffer) [ThisFieldDatumOffset])); + break; + + default: + DEBUG_PRINT (ACPI_ERROR, ("AmlWriteField: Invalid Byte Granularity: %x\n", + ByteGranularity)); + Status = AE_AML_OPERAND_VALUE; + goto Cleanup; + } + + /* + * Put together bits of the two raw data to make a complete field + * datum + */ + + if (ObjDesc->Field.BitOffset != 0) + { + MergedDatum = + (PreviousRawDatum >> (BitGranularity - ObjDesc->Field.BitOffset)) | + (ThisRawDatum << ObjDesc->Field.BitOffset); + } + + else + { + MergedDatum = ThisRawDatum; + } + + /* Now write the completed datum */ + + + Status = AcpiAmlWriteFieldData (ObjDesc, + ThisFieldByteOffset + ByteGranularity, + BitGranularity, MergedDatum); + if (ACPI_FAILURE (Status)) + { + goto Cleanup; + } + + + /* + * Save the most recent datum since it contains bits of + * the *next* field datum + */ + + PreviousRawDatum = ThisRawDatum; + + ThisFieldByteOffset += ByteGranularity; + + } /* while */ + + + /* Write a partial field datum if field does not end on a datum boundary */ + + if ((ObjDesc->FieldUnit.Length + ObjDesc->FieldUnit.BitOffset) % + BitGranularity) + { + switch (ByteGranularity) + { + case 1: + ThisRawDatum = ((UINT8 *) Buffer) [ThisFieldDatumOffset]; + break; + + case 2: + MOVE_UNALIGNED16_TO_32 (&ThisRawDatum, &(((UINT16 *) Buffer) [ThisFieldDatumOffset])); + break; + + case 4: + MOVE_UNALIGNED32_TO_32 (&ThisRawDatum, &(((UINT32 *) Buffer) [ThisFieldDatumOffset])); + break; + } + + /* Construct Mask with 1 bits where the field is, 0 bits elsewhere */ + + ValidFieldBits = ((ObjDesc->FieldUnit.Length % BitGranularity) + + ObjDesc->Field.BitOffset); + + Mask = (((UINT32) 1 << ValidFieldBits) - (UINT32) 1); + + /* Shift and mask the value into the field position */ + + FieldValue = (PreviousRawDatum >> + (BitGranularity - ObjDesc->Field.BitOffset)) & Mask; + + Status = AcpiAmlWriteFieldDataWithUpdateRule (ObjDesc, Mask, FieldValue, + ThisFieldByteOffset + ByteGranularity, + BitGranularity); + if (ACPI_FAILURE (Status)) + { + goto Cleanup; + } + } + + +Cleanup: + + return_ACPI_STATUS (Status); +} + + |