Hi Paddu, The Cortex-A8 has a Performance Monitor Control Register (coprocessor c9), you can check the documentation for the registers here (page 154, section 3.2.42): http://infocenter.arm.com/help/topic/com.arm.doc.ddi0344k/DDI0344K_cortex_a8_r3p2_trm.pdf
For a simple example of the code check this page: http://stackoverflow.com/questions/3247373/how-to-measure-program-execution-time-in-arm-cortex-a8-processor In there they use assembly to configure and read the registers for the Cortex-A8, so it can be ported to any OS I believe. The Peformance Monitoring Unit is very cool, there's a ton of events you can measure there, you can record up to 5 events (including the Clock Cycles CCNT). If you were using Linux it already has the implementation done for you, you only need some libraries (found in http://perfmon2.sourceforge.net/hw.html ). Hope this helps. Best Regards, Luis On Tuesday, 25 February 2014 03:02:31 UTC, Paddu wrote: > > Thank all for the kind reply. > > @liyaoshi-> I could find the link you have mentioned. > > @Grissiom -> Currently we are not using Linux, we are using Starterware. > > I shall see if we could implement this using a ASM code. > > > On Tuesday, February 25, 2014 11:56:11 AM UTC+9, liyaoshi wrote: >> >> From this link , you can see >> >> readtsc() means this only support on x86 ,tsc register is 64bit register >> and clock with main clock , on x86/64 this is can very precise >> >> On ARM, use generic PIT,(maybe you should write your own driver ) , >> >> only limit is almost PIT register is 32bit >> >> >> 2014-02-25 10:49 GMT+08:00 Grissiom <[email protected]>: >> >>> On Mon, Feb 24, 2014 at 10:26 PM, Paddu <[email protected]> wrote: >>> >>>> Hi, >>>> >>>> We need some advice in measuring Beaglebone CPU(Cortex-A8) clock cycles. >>>> Is there any way to measure the CPU cycles and use it inside the >>>> program? >>>> I have heard about "ccnt" register but don't know how exactly could we >>>> use that in the program. >>>> Please let me know if there is a reference or pointers on how to >>>> implement the code. >>>> >>>> >>> Do you want to measure cycles in Linux program or baremetal program? If >>> you are on Linux, this link: >>> >>> http://halobates.de/modern-pmus-yokohama.pdf >>> >>> may help you. If not, read the PMU section in the ARM ARM. >>> >>> -- >>> Cheers, >>> Grissiom >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >> >> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
