Advanced Configuration and Power Interface Specification

ACPI Source Language (ASL)Reference
Arguments
SearchPackage is evaluated to a package object and is treated as a one-dimension array. Each
package element must evaluate to either an integer, a string, or a buffer. Uninitialized package
elements and elements that do not evaluate to integers, strings, or buffers are ignored. Op1 and Op2
are match operators. MatchObject1 and MatchObject2 are the objects to be matched and must each
evaluate to either an integer, a string, or a buffer. StartIndex is the starting index within the
SearchPackage.
Description
A comparison is performed for each element of the package, starting with the index value indicated
by StartIndex (0 is the first element). If the element of SearchPackage being compared against is
called P[i], then the comparison is:
If (P[i] Op1 MatchObject1) and (P[i] Op2 MatchObject2) then Match => i is returned.
If the comparison succeeds, the index of the element that succeeded is returned; otherwise, the
constant object Ones is returned. The data type of the MatchObject dictates the required type of the
package element. If necessary, the package element is implicitly converted to match the type of the
MatchObject. If the implicit conversion fails for any reason, the package element is ignored (no
match.)
Op1 and Op2 have the values and meanings listed in the following table.
Table 19-369 Match Term Operator Meanings
Operator Encoding Macro
TRUE – A don’t care, always returns TRUE 0 MTR
EQ – Returns TRUE if P[i] == MatchObject 1 MEQ
LE – Returns TRUE if P[i] = MatchObject 4 MGE
GT – Returns TRUE if P[i] > MatchObject 5 MGT
Example
Following are some example uses of Match:
Version 6.0 859