![]() Portion of an address space, bit-aligned and of one-bit granularity. Has no effect if debugging is not active. Formats an object and prints it to the system debug port. Portion of a buffer created using CreateBitField, CreateByteField, CreateWordField, CreateQWordField, CreateField, or returned by the Index operator.ĭebug output object. Uninitialized elements are zero by default. Uninitialized objects must be initialized (via Store or CopyObject) before they may be used as source operands in ASL expressions.Īn array of bytes. This is the type of all control method LocalX variables and unused ArgX variables at the beginning of method execution, as well as all uninitialized Package elements. The table below describes each of the available ASL data types. It also provides mechanisms for both explicit and implicitĬonversion between the data types when used with ASL operators. The first byte (offset 0) of the parent resource template.įor example, given the above resource template, the following codeĬhanges the minimum and maximum addresses for the I/O descriptor named IO2:ĪSL provides a wide variety of data types and operators that manipulateĭata. Offset is the integer offset (in either bytes or bits) of the name from Is either in units of bytes (for 8-, 16-, 32-, and 64-bit field widths) The offset returned by a reference to a resource descriptor field name When a name is declared with a descriptor, the ASL compiler willĪutomatically create field names under the given name to refer to Occasionally, it is necessary to change a parameter of a descriptor inĪn existing resource template at run-time (i.e., during a methodĮxecution.) To facilitate this, the descriptor macros optionally includeĪ name declaration that can be used later to refer to the descriptor. VariableList refers to a list, not of predetermined length, of child Types can be left out of a fixed list, in which case the default value Some ObjectTypes can have a nullįixedList, which is simply omitted. Thus, (a,c) will cause the default value for Arguments to a FixedList can have default values, in whichĬase they can be skipped. ObjectType, and some elements can be nested objects, that is (a, b, (q, A fixed list is written as (Ī, b, c, … ) where the number of arguments depends on the specific ![]() Instances of a given ObjectType must have. Object := ObjectType FixedList VariableListįixedList refers to a list, of known length, that supplies data that all The tables below summarize the ASL 2.0 support for symbolic operators, compared to the legacy ASL equivalent.Īssignment and Compound Assignment operations Generated for the equivalent legacy ASL operators. The AML code that is generatedįrom the symbolic operators and expressions is identical to the AML code CompoundĪssignment operators are also supported. Operators and expressions that are similar to the C language. ASL 2.0 Symbolic Operators and Expressions ¶įor the math and logical operations, ASL supports standard symbolic ![]() Operator invocation syntax, the type of each argument, and aĭescription of the action and use of the operator.ġ9.1. The ASL grammar, which is the formal ASL specification and alsoĪ full ASL reference, which includes for each ASL operator: the Interpreter author must understand how to execute AML. Implementer must understand how to read ASL and generate AML. To be AML-level tools, not source-level tools.) An ASL translator (Debuggers and similar tools are expected A given user can define someĪrbitrary source language (to replace ASL) and write a tool to translateĪn OEM or platform firmware vendor needs to write ASL and be able to Generate ACPI Machine Language (AML) versions of the control methods.įor a formal definition of AML, see the ACPI Machine Language (AML) SpecificationĪML and ASL are different languages though they are closely related.Įvery ACPI-compatible OS must support AML. OEMs and platform firmware developers define objects and writeĬontrol methods in ASL and then use a translator tool (compiler) to Source language for defining ACPI objects including writing ACPI control This section formally defines the ACPI Source Language (ASL).
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