Advanced Configuration and Power Interface Specification

3.4.4 Waking the Computer ......................................................................................... 39
3.4.5 Example: Modem Device Power Management ................................................... 39
3.5 Processor Power Management....................................................................................... 42
3.6 Device and Processor Performance States .................................................................... 43
3.7 Configuration and “Plug and Play” .................................................................................. 43
3.7.1 Device Configuration Example: Configuring the Modem .................................... 44
3.7.2 NUMA Nodes ...................................................................................................... 44
3.8 System Events ................................................................................................................ 44
3.9 Battery Management....................................................................................................... 45
3.9.1 Battery Communications ..................................................................................... 45
3.9.2 Battery Capacity.................................................................................................. 46
3.9.3 Battery Gas Gauge ............................................................................................. 46
3.9.4 Low Battery Levels.............................................................................................. 47
3.9.5 Battery Calibration............................................................................................... 48
3.10 Thermal Managment..................................................................................................... 49
3.10.1 Active and Passive Cooling Modes................................................................... 50
3.10.2 Performance vs. Energy Conservation ............................................................. 51
3.10.3 Acoustics (Noise) .............................................................................................. 51
3.10.4 Multiple Thermal Zones..................................................................................... 51
3.11 Flexible Platform Architecture Support ......................................................................... 51
3.11.1 Hardware-reduced ACPI ................................................................................... 51
3.11.2 Low-Power Idle ................................................................................................. 52
3.11.3 Connection Resources...................................................................................... 52
4 � ACPI Hardware Specification ...................................................................... 55
4.1 Hardware-Reduced ACPI ............................................................................................... 55
4.1.1 Hardware-Reduced Events ................................................................................. 56
4.2 Fixed Hardware Programming Model ............................................................................. 56
4.2.1 Functional Fixed Hardware ................................................................................. 57
4.3 Generic Hardware Programming Model ......................................................................... 58
4.4 Diagram Legends............................................................................................................ 60
4.5 Register Bit Notation .......................................................................................................60
4.6 The ACPI Hardware Model ............................................................................................ 61
4.6.1 Hardware Reserved Bits ..................................................................................... 66
4.6.2 Hardware Ignored Bits ........................................................................................ 66
4.6.3 Hardware Write-Only Bits.................................................................................... 66
4.6.4 Cross Device Dependencies............................................................................... 66
4.7 ACPI Hardware Features................................................................................................ 67
4.8 ACPI Register Model ...................................................................................................... 68
4.8.1 ACPI Register Summary ..................................................................................... 71
4.8.2 Fixed Hardware Features.................................................................................... 74
4.8.3 Fixed Hardware Registers................................................................................... 84
4.8.4 Generic Hardware Registers............................................................................... 92
5 � ACPI Software Programming Model ......................................................... 101
5.1 Overview of the System Description Table Architecture .............................................. 101
vi Hewlett-Packard/Intel/Microsoft/Phoenix/Toshiba