Advanced Configuration and Power Interface Specification

ACPI Source Language (ASL)Reference
16 Debug Object
>16 Reserved
19.6.95 One (Constant One Integer)
Syntax
One=> Integer
Description
The One operator returns an Integer with the value 1. Writes to this object are not allowed. The use
of this operator can reduce AML code size, since it is represented by a one-byte AML opcode.
19.6.96 Ones (Constant Ones Integer)
Syntax
Ones=> Integer
Description
Description
The Ones operator returns an Integer with all bits set to 1. Writes to this object are not allowed. The
use of this operator can reduce AML code size, since it is represented by a one-byte AML opcode.
Note: The actual value of the integer returned by the Ones operator depends on the integer width of the
DSDT. If the revision of the DSDT is 1 or less, the integer width is 32 bits and Ones returns
0xFFFFFFFF. If the revision of the DSDT is 2 or greater, the integer width is 64 bits and Ones
returns 0xFFFFFFFFFFFFFFFF. This difference must be considered when performing
comparisons against the Ones Integer.
19.6.97 OperationRegion (Declare Operation Region)
Syntax
OperationRegion (RegionName, RegionSpace, Offset, Length)
Arguments
Declares an operation region named RegionName. Offset is the offset within the selected
RegionSpace at which the region starts (byte-granular), and Length is the length of the region in
bytes.
Description
An Operation Region is a type of data object where read or write operations to the data object are
performed in some hardware space. For example, the Definition Block can define an Operation
Region within a bus, or system I/O space. Any reads or writes to the named object will result in
accesses to the I/O space.
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