July 2008
Intermediate to advanced
544 pages
16h 52m
English
Content preview from Computers as Components, 2nd Edition
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336 CHAPTER 6 Processes and Operating Systems
Applications
Hardware platform
Device
drivers
Kernel
ACPI driver
AML interpreter
ACPI
ACPI BIOS
Power
management
ACPI tables ACPI registers
FIGURE 6.18
The advanced configuration and power interface and its relationship to a complete system.
■ G0, the working state, in which the system is fully usable.
■ The legacy state, in which the system does not comply with ACPI.
The power manager typically includes an observer, which receives messages
through the ACPI interface that describe the system behavior. It also includes
a decision module that determines power mana gement actions based on those
observations.
Design Example ...