Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Processor (
\_SB.CPU0,
// Processor Name
1, // ACPI Processor number
0x120, // PBlk system IO address
6 ) // PBlkLen
{
Name (_CST, Package()
{
3, // There are three C-states defined here with three semantics
Package(){ResourceTemplate(){Register(FFixedHW, 0, 0, 0)}, 1, 20, 1000},
Package(){ResourceTemplate(){Register(SystemIO, 8, 0, 0x161)}, 2, 40, 750},
Package(){ResourceTemplate(){Register(SystemIO, 8, 0, 0x162)}, 3, 60, 500}
})
Name(_CSD, Package()
{
Package(){6, 0, 0, 0xFD, 2, 1} , // 6 entries,Revision 0,Domain 0,OSPM Coordinate
// Initiate on Any Proc,2 Procs, Index 1 (C2-type)
Package(){6, 0, 0, 0xFD, 2, 2} // 6 entries,Revision 0 Domain 0,OSPM Coordinate
// Initiate on Any Proc,2 Procs, Index 2 (C3-type)
})
}
Processor (
\_SB.CPU1,
// Processor Name
2, // ACPI Processor number
, // PBlk system IO address
) // PBlkLen
{
Name(_CST, Package()
{
3, // There are three C-states defined here with three semantics
Package(){ResourceTemplate(){Register(FFixedHW, 0, 0, 0)}, 1, 20, 1000},
Package(){ResourceTemplate(){Register(SystemIO, 8, 0, 0x161)}, 2, 40, 750},
Package(){ResourceTemplate(){Register(SystemIO, 8, 0, 0x162)}, 3, 60, 500}
})
Name(_CSD, Package()
{
Package(){6, 0, 0, 0xFD, 2, 1}, // 6 entries,Revision 0,Domain 0,OSPM Coordinate
// Initiate on any Proc,2 Procs, Index 1 (C2-type)
Package(){6, 0, 0, 0xFD, 2, 2} // 6 entries,Revision 0,Domain 0,OSPM Coordinate
// Initiate on any Proc,2 Procs,Index 2 (C3-type)
})
}
When the platform issues a Notify(\_SB.CPU0, 0x81) to inform OSPM to re-evaluate _CST when
the number of available processor power states changes, OSPM should also evaluate _CSD.
8.4.3 Processor Hierarchy
It is very typical for computing platforms to have a multitude of processors that share common
resources, such as caches, and which have common power states that affect groups of processors.
These are arranged in a hierarchical manner. For example, a system may contain a set of NUMA
nodes, each with a number of sockets, which may contain multiple groups of processors, each of
which may contain individual processor cores, each of which may contain multiple hardware
threads. Different architectures use different terminology to denominate logically associated
processors, but terms such as package, cluster, module, and socket are typical examples. ACPI uses
the term processor container to describe a group of associated processors. Processors are said to
434 April, 2015 Version 6.0