Advanced Configuration and Power Interface Specification

ACPI-Defined Devices and Device-Specific Objects
Example:
// _DSM – Device Specific Method
//
// Arg0: UUID Unique function identifier
// Arg1: Integer Revision Level
// Arg2: Integer Function Index (0 = Return Supported Functions)
// Arg3: Package Parameters
Function(_DSM,{IntObj,BuffObj},{BuffObj, IntObj, IntObj, PkgObj})
{
//
// Switch based on which unique function identifier was passed in
//
switch(Arg0)
{
//
// First function identifier
//
case(ToUUID(“893f00a6-660c-494e-bcfd-3043f4fb67c0”))
{
switch(Arg2)
{
//
// Function 0: Return supported functions, based on revision
//
case(0)
{
switch(Arg1)
{
// revision 0: functions 1-4 are supported
case(0) {return (Buffer() {0x1F})}
// revision 1: functions 1-5 are supported
case(1) {return (Buffer() {0x3F})}
}
// revision 2+: functions 1-7 are supported
return (Buffer() {0xFF})
}
//
// Function 1:
//
case(1)
{
… function 1 code …
Return(Zero)
}
//
// Function 2:
//
case(2)
{
… function 2 code …
Return(Buffer(){0x00})
}
case(3) { … function 3 code …}
case(4) { … function 4 code …}
case(5) { if (LLess(Arg1,1) BreakPoint; … function 5 code … }
case(6) { if (LLess(Arg1,2) BreakPoint; … function 6 code … )
case(7) { if (LLess(Arg1,3) BreakPoint; … function 7 code … )
default {BreakPoint }
}
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