CPU frequency management endpoint

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Methods of KasperskyOS core endpoints

CPU frequency management endpoint

August 2, 2023

ID kernel_methods_cpufreq

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This endpoint is intended for changing the frequency of processors (processor cores).

Information about methods of the endpoint is provided in the table below.

Methods of the cpufreq.CpuFreq endpoint (kl.core.CpuFreq interface)

Method	Method purpose and parameters	Potential danger of the method
`GetLayout`	Purpose Allows you to receive information about processor groups. Processor group information lists the existing processor groups while indicating the possible values of the performance parameter for each of them. This parameter is a combination of the matching frequency and voltage (Operating Performance Point, or OPP). The frequency is indicated in kiloherz (kHz) and the voltage is indicated in microvolts (µV). Parameters [out] `layout` – sequence containing information about processor groups. [out] `rc` – return code.	N/A
`GetCurOppId`	Purpose Lets you get the index of the current OPP for the defined processor group. Parameters [in] `cpuGroupId` – index of the processor group. Enumeration starts with zero. [out] `oppId` – index of the current OPP. Enumeration starts with zero. [out] `rc` – return code.	N/A
`SetOppId`	Purpose Sets the defined OPP for the defined processor group. Parameters [in] `GroupId` – index of the processor group. Enumeration starts with zero. [in] `oppId` – OPP index. Enumeration starts with zero. [out] `rc` – return code.	Lets you change the frequency of a processor group.

Method

Method purpose and parameters

Potential danger of the method

GetLayout

Purpose

Allows you to receive information about processor groups.

Processor group information lists the existing processor groups while indicating the possible values of the performance parameter for each of them. This parameter is a combination of the matching frequency and voltage (Operating Performance Point, or OPP). The frequency is indicated in kiloherz (kHz) and the voltage is indicated in microvolts (µV).

Parameters

[out] layout – sequence containing information about processor groups.
[out] rc – return code.

N/A

GetCurOppId

Purpose

Lets you get the index of the current OPP for the defined processor group.

Parameters

[in] cpuGroupId – index of the processor group. Enumeration starts with zero.
[out] oppId – index of the current OPP. Enumeration starts with zero.
[out] rc – return code.

N/A

SetOppId

Purpose

Sets the defined OPP for the defined processor group.

Parameters

[in] GroupId – index of the processor group. Enumeration starts with zero.
[in] oppId – OPP index. Enumeration starts with zero.
[out] rc – return code.

Lets you change the frequency of a processor group.

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