Advanced Configuration and Power Interface Specification

Processor Configuration and Control
Example
This is an example usage of the _PSD structure in a Processor structure in the namespace. The
example represents a two processor configuration with three performance states per processor. For
all performance states, there exists dependence between the two processors, such that one processor
transitioning to a particular performance state, causes the other processor to transition to the same
performance state. OSPM will be required to coordinate the P-state transitions between the two
processors and can initiate a transition on either processor to cause both to transition to the common
target P-state.
Processor (
\_SB.CPU0,
// Processor Name
1, // ACPI Processor number
0x120, // PBlk system IO address
6 ) // PBlkLen
{
Name(_PCT, Package () // Performance Control object
{
ResourceTemplate(){Register(FFixedHW, 0, 0, 0)},
ResourceTemplate(){Register(FFixedHW, 0, 0, 0)}
}) // End of _PCT object
// PERF_CTRL
// PERF_STATUS
Name (_PSS, Package()
{
Package(){650, 21500, 500, 300, 0x00, 0x08},
Package(){600, 14900, 500, 300, 0x01, 0x05},
Package(){500, 8200, 500, 300, 0x02, 0x06}
}) // End of _PSS object
// Performance State zero (P0)
// Performance State one (P1)
// Performance State two (P2)
Method (_PPC, 0) // Performance Present Capabilities method
{
} // End of _PPC method
Name (_PSD, Package()
{
Package(){5, 0, 0, 0xFD, 2}
}) // End of _PSD object
} // End of processor object list
// 5 entries, Revision 0), Domain 0, OSPM
// Coordinate, Initiate on any Proc, 2 Procs
Processor (
\_SB.CPU1,
// Processor Name
2, // ACPI Processor number
, // PBlk system IO address
) // PBlkLen
{
Name(_PCT, Package () // Performance Control object
{
ResourceTemplate(){Register(FFixedHW, 0, 0, 0)}, // PERF_CTRL
ResourceTemplate(){Register(FFixedHW, 0, 0, 0)} // PERF_STATUS
}) // End of _PCT object
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