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Arm11 clock

Note: This was originally posted on 13th October 2008 at http://forums.arm.com

Hello,

Does anyone know if there is a timestamp clock in Arm? Something like the RDTSC in intel?
Or some other high frequency clock?
I need a clock to mesure performance of my linux kernel (and I use the RTC for something else).

Thanks everyone!

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0 Jacob Bramley over 12 years ago

Note: This was originally posted on 13th October 2008 at http://forums.arm.com

You can use the System Control Coprocessor (CP15) to perform performance monitoring. Under Linux, you'll need to do this from a driver so that you have access to a privileged execution mode.

Documentation for CP15 in the ARM1176 can be found [url="http://infocenter.arm.com/help/topic/com.arm.doc.ddi0333g/Bgbgbgeb.html"]here[/url]. If you're using a different ARM11 (such as the ARM1136), you'll need to look around to find it.

[url="http://infocenter.arm.com/help/topic/com.arm.doc.ddi0333g/Bahcaafe.html"]This page[/url] provides an overview of the performance monitor, but you'll need to fish around the CP15 documentation in order to find out how to use the registers.

Let me know if that's what you're after,
Jacob
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0 Jacob Bramley over 12 years ago

Note: This was originally posted on 13th October 2008 at http://forums.arm.com

You can use the System Control Coprocessor (CP15) to perform performance monitoring. Under Linux, you'll need to do this from a driver so that you have access to a privileged execution mode.

Documentation for CP15 in the ARM1176 can be found [url="http://infocenter.arm.com/help/topic/com.arm.doc.ddi0333g/Bgbgbgeb.html"]here[/url]. If you're using a different ARM11 (such as the ARM1136), you'll need to look around to find it.

[url="http://infocenter.arm.com/help/topic/com.arm.doc.ddi0333g/Bahcaafe.html"]This page[/url] provides an overview of the performance monitor, but you'll need to fish around the CP15 documentation in order to find out how to use the registers.

Let me know if that's what you're after,
Jacob
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