• When are A32 state and A64 state determined?

    hi, expert

    i study ArmV8 architecture.

      On taking an exception to a higher Exception level, the Execution state either:

        • Remains unchanged.

        • Changes from AArch32 state to AArch64 state.

      i konw that…

  • ARM v8 PMU Cycle counter

    All,

    When I am using the cycle counter in AArch64, I am not getting cycles properly. I have enabled read of pmccntr_el0 in user space using a small kernel module. I have sample code like:

    asm volatile("isb;mrs %0, pmccntr_el0" : "=r"(prev));

    sleep…