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1048 lines
32 KiB
C
1048 lines
32 KiB
C
/******************************************************************************
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*
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* Module Name: exfldio - Aml Field I/O
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2022, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "acpi.h"
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#include "accommon.h"
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#include "acinterp.h"
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#include "amlcode.h"
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#include "acevents.h"
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#include "acdispat.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME ("exfldio")
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/* Local prototypes */
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static ACPI_STATUS
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AcpiExFieldDatumIo (
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ACPI_OPERAND_OBJECT *ObjDesc,
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UINT32 FieldDatumByteOffset,
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UINT64 *Value,
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UINT32 ReadWrite);
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static BOOLEAN
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AcpiExRegisterOverflow (
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ACPI_OPERAND_OBJECT *ObjDesc,
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UINT64 Value);
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static ACPI_STATUS
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AcpiExSetupRegion (
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ACPI_OPERAND_OBJECT *ObjDesc,
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UINT32 FieldDatumByteOffset);
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/*******************************************************************************
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*
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* FUNCTION: AcpiExSetupRegion
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*
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* PARAMETERS: ObjDesc - Field to be read or written
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* FieldDatumByteOffset - Byte offset of this datum within the
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* parent field
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*
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* RETURN: Status
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*
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* DESCRIPTION: Common processing for AcpiExExtractFromField and
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* AcpiExInsertIntoField. Initialize the Region if necessary and
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* validate the request.
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiExSetupRegion (
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ACPI_OPERAND_OBJECT *ObjDesc,
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UINT32 FieldDatumByteOffset)
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{
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ACPI_STATUS Status = AE_OK;
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ACPI_OPERAND_OBJECT *RgnDesc;
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UINT8 SpaceId;
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ACPI_FUNCTION_TRACE_U32 (ExSetupRegion, FieldDatumByteOffset);
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RgnDesc = ObjDesc->CommonField.RegionObj;
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/* We must have a valid region */
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if (RgnDesc->Common.Type != ACPI_TYPE_REGION)
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{
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ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)",
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RgnDesc->Common.Type,
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AcpiUtGetObjectTypeName (RgnDesc)));
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
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}
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SpaceId = RgnDesc->Region.SpaceId;
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/* Validate the Space ID */
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if (!AcpiIsValidSpaceId (SpaceId))
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{
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ACPI_ERROR ((AE_INFO,
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"Invalid/unknown Address Space ID: 0x%2.2X", SpaceId));
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return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID);
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}
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/*
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* If the Region Address and Length have not been previously evaluated,
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* evaluate them now and save the results.
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*/
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if (!(RgnDesc->Common.Flags & AOPOBJ_DATA_VALID))
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{
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Status = AcpiDsGetRegionArguments (RgnDesc);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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}
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/*
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* Exit now for SMBus, GSBus or IPMI address space, it has a non-linear
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* address space and the request cannot be directly validated
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*/
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if (SpaceId == ACPI_ADR_SPACE_SMBUS ||
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SpaceId == ACPI_ADR_SPACE_GSBUS ||
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SpaceId == ACPI_ADR_SPACE_IPMI)
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{
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/* SMBus or IPMI has a non-linear address space */
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return_ACPI_STATUS (AE_OK);
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}
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#ifdef ACPI_UNDER_DEVELOPMENT
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/*
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* If the Field access is AnyAcc, we can now compute the optimal
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* access (because we know the length of the parent region)
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*/
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if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
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{
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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}
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#endif
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/*
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* Validate the request. The entire request from the byte offset for a
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* length of one field datum (access width) must fit within the region.
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* (Region length is specified in bytes)
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*/
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if (RgnDesc->Region.Length <
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(ObjDesc->CommonField.BaseByteOffset + FieldDatumByteOffset +
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ObjDesc->CommonField.AccessByteWidth))
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{
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if (AcpiGbl_EnableInterpreterSlack)
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{
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/*
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* Slack mode only: We will go ahead and allow access to this
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* field if it is within the region length rounded up to the next
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* access width boundary. ACPI_SIZE cast for 64-bit compile.
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*/
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if (ACPI_ROUND_UP (RgnDesc->Region.Length,
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ObjDesc->CommonField.AccessByteWidth) >=
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((ACPI_SIZE) ObjDesc->CommonField.BaseByteOffset +
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ObjDesc->CommonField.AccessByteWidth +
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FieldDatumByteOffset))
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{
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return_ACPI_STATUS (AE_OK);
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}
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}
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if (RgnDesc->Region.Length < ObjDesc->CommonField.AccessByteWidth)
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{
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/*
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* This is the case where the AccessType (AccWord, etc.) is wider
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* than the region itself. For example, a region of length one
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* byte, and a field with Dword access specified.
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*/
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ACPI_ERROR ((AE_INFO,
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"Field [%4.4s] access width (%u bytes) "
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"too large for region [%4.4s] (length %u)",
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AcpiUtGetNodeName (ObjDesc->CommonField.Node),
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ObjDesc->CommonField.AccessByteWidth,
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AcpiUtGetNodeName (RgnDesc->Region.Node),
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RgnDesc->Region.Length));
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}
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/*
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* Offset rounded up to next multiple of field width
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* exceeds region length, indicate an error
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*/
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ACPI_ERROR ((AE_INFO,
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"Field [%4.4s] Base+Offset+Width %u+%u+%u "
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"is beyond end of region [%4.4s] (length %u)",
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AcpiUtGetNodeName (ObjDesc->CommonField.Node),
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ObjDesc->CommonField.BaseByteOffset,
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FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth,
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AcpiUtGetNodeName (RgnDesc->Region.Node),
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RgnDesc->Region.Length));
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return_ACPI_STATUS (AE_AML_REGION_LIMIT);
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}
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExAccessRegion
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*
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* PARAMETERS: ObjDesc - Field to be read
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* FieldDatumByteOffset - Byte offset of this datum within the
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* parent field
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* Value - Where to store value (must at least
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* 64 bits)
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* Function - Read or Write flag plus other region-
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* dependent flags
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read or Write a single field datum to an Operation Region.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExAccessRegion (
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ACPI_OPERAND_OBJECT *ObjDesc,
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UINT32 FieldDatumByteOffset,
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UINT64 *Value,
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UINT32 Function)
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{
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ACPI_STATUS Status;
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ACPI_OPERAND_OBJECT *RgnDesc;
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UINT32 RegionOffset;
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ACPI_FUNCTION_TRACE (ExAccessRegion);
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/*
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* Ensure that the region operands are fully evaluated and verify
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* the validity of the request
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*/
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Status = AcpiExSetupRegion (ObjDesc, FieldDatumByteOffset);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/*
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* The physical address of this field datum is:
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*
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* 1) The base of the region, plus
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* 2) The base offset of the field, plus
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* 3) The current offset into the field
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*/
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RgnDesc = ObjDesc->CommonField.RegionObj;
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RegionOffset =
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ObjDesc->CommonField.BaseByteOffset +
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FieldDatumByteOffset;
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if ((Function & ACPI_IO_MASK) == ACPI_READ)
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[READ]"));
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}
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else
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[WRITE]"));
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}
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ACPI_DEBUG_PRINT_RAW ((ACPI_DB_BFIELD,
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" Region [%s:%X], Width %X, ByteBase %X, Offset %X at %8.8X%8.8X\n",
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AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
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RgnDesc->Region.SpaceId,
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ObjDesc->CommonField.AccessByteWidth,
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ObjDesc->CommonField.BaseByteOffset,
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FieldDatumByteOffset,
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ACPI_FORMAT_UINT64 (RgnDesc->Region.Address + RegionOffset)));
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/* Invoke the appropriate AddressSpace/OpRegion handler */
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Status = AcpiEvAddressSpaceDispatch (RgnDesc, ObjDesc,
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Function, RegionOffset,
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ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth), Value);
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if (ACPI_FAILURE (Status))
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{
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if (Status == AE_NOT_IMPLEMENTED)
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{
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ACPI_ERROR ((AE_INFO,
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"Region %s (ID=%u) not implemented",
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AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
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RgnDesc->Region.SpaceId));
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}
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else if (Status == AE_NOT_EXIST)
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{
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ACPI_ERROR ((AE_INFO,
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"Region %s (ID=%u) has no handler",
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AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
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RgnDesc->Region.SpaceId));
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}
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}
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExRegisterOverflow
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*
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* PARAMETERS: ObjDesc - Register(Field) to be written
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* Value - Value to be stored
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*
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* RETURN: TRUE if value overflows the field, FALSE otherwise
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*
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* DESCRIPTION: Check if a value is out of range of the field being written.
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* Used to check if the values written to Index and Bank registers
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* are out of range. Normally, the value is simply truncated
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* to fit the field, but this case is most likely a serious
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* coding error in the ASL.
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*
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******************************************************************************/
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static BOOLEAN
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AcpiExRegisterOverflow (
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ACPI_OPERAND_OBJECT *ObjDesc,
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UINT64 Value)
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{
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if (ObjDesc->CommonField.BitLength >= ACPI_INTEGER_BIT_SIZE)
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{
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/*
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* The field is large enough to hold the maximum integer, so we can
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* never overflow it.
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*/
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return (FALSE);
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}
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if (Value >= ((UINT64) 1 << ObjDesc->CommonField.BitLength))
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{
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/*
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* The Value is larger than the maximum value that can fit into
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* the register.
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*/
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ACPI_ERROR ((AE_INFO,
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"Index value 0x%8.8X%8.8X overflows field width 0x%X",
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ACPI_FORMAT_UINT64 (Value),
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ObjDesc->CommonField.BitLength));
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return (TRUE);
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}
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/* The Value will fit into the field with no truncation */
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return (FALSE);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExFieldDatumIo
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*
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* PARAMETERS: ObjDesc - Field to be read
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* FieldDatumByteOffset - Byte offset of this datum within the
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* parent field
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* Value - Where to store value (must be 64 bits)
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* ReadWrite - Read or Write flag
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read or Write a single datum of a field. The FieldType is
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* demultiplexed here to handle the different types of fields
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* (BufferField, RegionField, IndexField, BankField)
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiExFieldDatumIo (
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ACPI_OPERAND_OBJECT *ObjDesc,
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UINT32 FieldDatumByteOffset,
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UINT64 *Value,
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UINT32 ReadWrite)
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{
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ACPI_STATUS Status;
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UINT64 LocalValue;
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ACPI_FUNCTION_TRACE_U32 (ExFieldDatumIo, FieldDatumByteOffset);
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if (ReadWrite == ACPI_READ)
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{
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if (!Value)
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{
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LocalValue = 0;
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/* To support reads without saving return value */
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Value = &LocalValue;
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}
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/* Clear the entire return buffer first, [Very Important!] */
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*Value = 0;
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}
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/*
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* The four types of fields are:
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*
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* BufferField - Read/write from/to a Buffer
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* RegionField - Read/write from/to a Operation Region.
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* BankField - Write to a Bank Register, then read/write from/to an
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* OperationRegion
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* IndexField - Write to an Index Register, then read/write from/to a
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* Data Register
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*/
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switch (ObjDesc->Common.Type)
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{
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case ACPI_TYPE_BUFFER_FIELD:
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/*
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* If the BufferField arguments have not been previously evaluated,
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* evaluate them now and save the results.
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*/
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if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
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{
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Status = AcpiDsGetBufferFieldArguments (ObjDesc);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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}
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|
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if (ReadWrite == ACPI_READ)
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{
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/*
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* Copy the data from the source buffer.
|
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* Length is the field width in bytes.
|
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*/
|
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memcpy (Value,
|
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(ObjDesc->BufferField.BufferObj)->Buffer.Pointer +
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ObjDesc->BufferField.BaseByteOffset +
|
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FieldDatumByteOffset,
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ObjDesc->CommonField.AccessByteWidth);
|
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}
|
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else
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{
|
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/*
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* Copy the data to the target buffer.
|
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* Length is the field width in bytes.
|
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*/
|
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memcpy ((ObjDesc->BufferField.BufferObj)->Buffer.Pointer +
|
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ObjDesc->BufferField.BaseByteOffset +
|
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FieldDatumByteOffset,
|
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Value, ObjDesc->CommonField.AccessByteWidth);
|
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}
|
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|
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Status = AE_OK;
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break;
|
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|
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case ACPI_TYPE_LOCAL_BANK_FIELD:
|
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/*
|
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* Ensure that the BankValue is not beyond the capacity of
|
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* the register
|
|
*/
|
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if (AcpiExRegisterOverflow (ObjDesc->BankField.BankObj,
|
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(UINT64) ObjDesc->BankField.Value))
|
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{
|
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return_ACPI_STATUS (AE_AML_REGISTER_LIMIT);
|
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}
|
|
|
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/*
|
|
* For BankFields, we must write the BankValue to the BankRegister
|
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* (itself a RegionField) before we can access the data.
|
|
*/
|
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Status = AcpiExInsertIntoField (ObjDesc->BankField.BankObj,
|
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&ObjDesc->BankField.Value,
|
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sizeof (ObjDesc->BankField.Value));
|
|
if (ACPI_FAILURE (Status))
|
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{
|
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return_ACPI_STATUS (Status);
|
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}
|
|
|
|
/*
|
|
* Now that the Bank has been selected, fall through to the
|
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* RegionField case and write the datum to the Operation Region
|
|
*/
|
|
|
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ACPI_FALLTHROUGH;
|
|
|
|
case ACPI_TYPE_LOCAL_REGION_FIELD:
|
|
/*
|
|
* For simple RegionFields, we just directly access the owning
|
|
* Operation Region.
|
|
*/
|
|
Status = AcpiExAccessRegion (
|
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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,
|
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(UINT64) ObjDesc->IndexField.Value))
|
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{
|
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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 (UINT64));
|
|
}
|
|
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 (UINT64));
|
|
}
|
|
break;
|
|
|
|
default:
|
|
|
|
ACPI_ERROR ((AE_INFO, "Wrong object type in field I/O %u",
|
|
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 %u\n",
|
|
ACPI_FORMAT_UINT64 (*Value),
|
|
ObjDesc->CommonField.AccessByteWidth));
|
|
}
|
|
else
|
|
{
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
|
|
"Value Written %8.8X%8.8X, Width %u\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,
|
|
UINT64 Mask,
|
|
UINT64 FieldValue,
|
|
UINT32 FieldDatumByteOffset)
|
|
{
|
|
ACPI_STATUS Status = AE_OK;
|
|
UINT64 MergedValue;
|
|
UINT64 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_UINT64_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: 0x%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;
|
|
UINT64 RawDatum;
|
|
UINT64 MergedDatum;
|
|
UINT32 FieldOffset = 0;
|
|
UINT32 BufferOffset = 0;
|
|
UINT32 BufferTailBits;
|
|
UINT32 DatumCount;
|
|
UINT32 FieldDatumCount;
|
|
UINT32 AccessBitWidth;
|
|
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 %u (bits) is too large for buffer (%u)",
|
|
ObjDesc->CommonField.BitLength, BufferLength));
|
|
|
|
return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
|
|
}
|
|
|
|
memset (Buffer, 0, BufferLength);
|
|
AccessBitWidth = ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth);
|
|
|
|
/* Handle the simple case here */
|
|
|
|
if ((ObjDesc->CommonField.StartFieldBitOffset == 0) &&
|
|
(ObjDesc->CommonField.BitLength == AccessBitWidth))
|
|
{
|
|
if (BufferLength >= sizeof (UINT64))
|
|
{
|
|
Status = AcpiExFieldDatumIo (ObjDesc, 0, Buffer, ACPI_READ);
|
|
}
|
|
else
|
|
{
|
|
/* Use RawDatum (UINT64) to handle buffers < 64 bits */
|
|
|
|
Status = AcpiExFieldDatumIo (ObjDesc, 0, &RawDatum, ACPI_READ);
|
|
memcpy (Buffer, &RawDatum, BufferLength);
|
|
}
|
|
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
/* TBD: Move to common setup code */
|
|
|
|
/* Field algorithm is limited to sizeof(UINT64), truncate if needed */
|
|
|
|
if (ObjDesc->CommonField.AccessByteWidth > sizeof (UINT64))
|
|
{
|
|
ObjDesc->CommonField.AccessByteWidth = sizeof (UINT64);
|
|
AccessBitWidth = sizeof (UINT64) * 8;
|
|
}
|
|
|
|
/* Compute the number of datums (access width data items) */
|
|
|
|
DatumCount = ACPI_ROUND_UP_TO (
|
|
ObjDesc->CommonField.BitLength, AccessBitWidth);
|
|
|
|
FieldDatumCount = ACPI_ROUND_UP_TO (
|
|
ObjDesc->CommonField.BitLength +
|
|
ObjDesc->CommonField.StartFieldBitOffset, 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 (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset <
|
|
ACPI_INTEGER_BIT_SIZE)
|
|
{
|
|
MergedDatum |= RawDatum <<
|
|
(AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset);
|
|
}
|
|
|
|
if (i == DatumCount)
|
|
{
|
|
break;
|
|
}
|
|
|
|
/* Write merged datum to target buffer */
|
|
|
|
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 % AccessBitWidth;
|
|
if (BufferTailBits)
|
|
{
|
|
MergedDatum &= ACPI_MASK_BITS_ABOVE (BufferTailBits);
|
|
}
|
|
|
|
/* Write the last datum to the buffer */
|
|
|
|
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)
|
|
{
|
|
void *NewBuffer;
|
|
ACPI_STATUS Status;
|
|
UINT64 Mask;
|
|
UINT64 WidthMask;
|
|
UINT64 MergedDatum;
|
|
UINT64 RawDatum = 0;
|
|
UINT32 FieldOffset = 0;
|
|
UINT32 BufferOffset = 0;
|
|
UINT32 BufferTailBits;
|
|
UINT32 DatumCount;
|
|
UINT32 FieldDatumCount;
|
|
UINT32 AccessBitWidth;
|
|
UINT32 RequiredLength;
|
|
UINT32 i;
|
|
|
|
|
|
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.
|
|
*/
|
|
memcpy ((char *) NewBuffer, (char *) Buffer, BufferLength);
|
|
Buffer = NewBuffer;
|
|
BufferLength = RequiredLength;
|
|
}
|
|
|
|
/* TBD: Move to common setup code */
|
|
|
|
/* Algo is limited to sizeof(UINT64), so cut the AccessByteWidth */
|
|
if (ObjDesc->CommonField.AccessByteWidth > sizeof (UINT64))
|
|
{
|
|
ObjDesc->CommonField.AccessByteWidth = sizeof (UINT64);
|
|
}
|
|
|
|
AccessBitWidth = ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth);
|
|
|
|
/* Create the bitmasks used for bit insertion */
|
|
|
|
WidthMask = ACPI_MASK_BITS_ABOVE_64 (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,
|
|
AccessBitWidth);
|
|
|
|
FieldDatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength +
|
|
ObjDesc->CommonField.StartFieldBitOffset,
|
|
AccessBitWidth);
|
|
|
|
/* Get initial Datum from the input buffer */
|
|
|
|
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 ((AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset) <
|
|
ACPI_INTEGER_BIT_SIZE)
|
|
{
|
|
MergedDatum = RawDatum >>
|
|
(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;
|
|
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) % 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);
|
|
}
|