The relationship between acpi and cpufreq，cpuidle?

The relationship between acpi and cpufreq，cpuidle?

[wkq5325]

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Hi，

I have read some papers about Linux/acpi. I want to ask  a  question.
1 .The acpica is a part of OSPM. Cpufreq and cpuidle uses some interface in ACPI processor drivers. 
2. In ACPI specifications 4.0 ，something like OSPM system code. Although it is a abstract description,
   OSPM system code means something kernel modules like cpufreq and cpuidle？But they are in kernel, why
   does it make a difference between kernel and OSPM system code?
3. Acpica is independent of Linux/acpi， they are glued with the OSL layer. So the Linux/acpi is mainly 
   about device drivers? 

 Thank you for your appreciation!




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