Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
are executed. There can be at most one Default statement. The Default statement can appear
anywhere in the body of the Switch statement.
A Case or Default term can only appear inside a Switch statement. Switch statements can be nested.
(Compatibility Note) The Switch, Case, and Default terms were first introduced in ACPI 2.0.
However, their implementation is backward compatible with ACPI 1.0 AML interpreters.
Example
Use of the Switch statement usually looks something like this:
Switch (expression)
{
Case (value) {
Statements executed if Lequal (expression, value)
}
Case (Package () {value, value, value}) {
Statements executed if Lequal (expression, any value in package)
}
Default {
Statements executed if expression does not equal
any case constant-expression
}
}
Note: (Compiler Note) The following example demonstrates how the Switch statement should be
translated into ACPI 1.0-compatible AML:
Switch (Add (ABCD( ),1)
{
Case (1) {
…statements1…
}
Case (Package () {4,5,6}) {
…statements2…
}
Default {
…statements3…
}
}
is translated as:
890 April, 2015 Version 6.0