Advanced Configuration and Power Interface Specification

ACPI Source Language (ASL)Reference
19.6 ASL Operator Reference
This section describes each of the ASL operators. The syntax for each operator is given, with a
description of each argument and an overall description of the operator behavior. Example ASL
code is provided for the more complex operators.
ASL operators can be categorized as follows:
• Named Object creation
• Method execution control (If, Else, While, etc.)
• Integer math
• Logical operators
• Resource Descriptor macros
• Object conversion
• Utility/Miscellaneous
19.6.1 AccessAs (Change Field Unit Access)
Syntax
AccessAs (AccessType, AccessAttribute)
AccessAs (AccessType, AccessAttribute (AccessLength))
Arguments
AccessType is an AccessTypeKeyword that specifies the type of access desired (ByteAcc,
WordAcc, etc.). AccessAttribute is an optional argument of type AccessAttributeKeyword that
specifies additional protocols to be used, such as AttribQuick, AttribSendReceive, etc.
AccessLength is a required argument for some of the Access Attributes.
Description
The AccessAs operator is used within a FieldList to specify the Access Type, Access Attributes, and
Access Length for the remaining FieldUnits within the list (or until another AccessAs operator is
encountered.) It allows FieldUnits to have different access types within a single Field definition.
Supported AccessTypes:
• AnyAcc
• ByteAcc
• WordAcc
• DwordAcc
• QWordAcc
• BufferAcc
Supported simple AccessAttributes (with SMBus synonyms):
• AttribQuick (SMBQuick)
• AttribSendReceive (SMBSendReceive)
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