[PATCH 3/4] Add _CPU_Counter_frequency()

Gedare Bloom gedare at rtems.org
Fri Jun 15 14:16:53 UTC 2018


Hi Sebastian,

The only real question I have is about the default value of 1 GHz.
(How) does this affect the accuracy/correctness of the BSPs that use
this default implementation?

As a side note, using Hz units in uint32_t means we limit to about 4.2
GHz. This seems a safe assumption, but worth documenting?

Gedare

On Fri, Jun 15, 2018 at 7:13 AM, Sebastian Huber
<sebastian.huber at embedded-brains.de> wrote:
> Add rtems_counter_frequency() API function.  Use it to initialize the
> counter value converter via the new system initialization step
> (RTEMS_SYSINIT_CPU_COUNTER).  This decouples the counter implementation
> and the counter converter.  It avoids an unnecessary pull in of the
> 64-bit integer division from libgcc.
>
> Update #3456.
> ---
>  bsps/arm/altera-cyclone-v/start/bspstart.c         |  2 --
>  bsps/arm/include/bsp/arm-a9mpcore-clock.h          |  9 ---------
>  bsps/arm/lpc176x/start/system-clocks.c             |  5 +++++
>  bsps/arm/lpc24xx/start/system-clocks.c             |  5 ++++-
>  bsps/arm/lpc32xx/start/bspstart.c                  |  6 +++++-
>  bsps/arm/realview-pbx-a9/start/bspstart.c          |  2 --
>  bsps/arm/shared/clock/clock-a9mpcore.c             |  5 +++++
>  bsps/arm/shared/clock/clock-generic-timer.c        | 11 +++++++----
>  bsps/arm/shared/cpucounter/cpucounter-armv7m.c     | 23 +++++++++++-----------
>  bsps/arm/tms570/cpucounter/cpucounterread.c        |  7 +++++--
>  bsps/arm/xilinx-zynq/start/bspstart.c              |  2 --
>  bsps/powerpc/beatnik/start/bspstart.c              |  8 +++++---
>  bsps/powerpc/gen5200/start/bspstart.c              |  6 +++++-
>  bsps/powerpc/gen83xx/start/bspstart.c              |  6 +++++-
>  bsps/powerpc/haleakala/start/bspstart.c            |  6 +++++-
>  bsps/powerpc/motorola_powerpc/start/bspstart.c     |  8 +++++---
>  bsps/powerpc/mpc55xxevb/start/bspstart.c           |  6 +++++-
>  bsps/powerpc/mpc8260ads/start/bspstart.c           |  6 +++++-
>  bsps/powerpc/mvme3100/start/bspstart.c             |  8 +++++---
>  bsps/powerpc/mvme5500/start/bspstart.c             |  8 +++++---
>  bsps/powerpc/psim/start/bspstart.c                 |  6 +++++-
>  bsps/powerpc/qemuppc/start/bspstart.c              |  6 +++++-
>  bsps/powerpc/qoriq/start/bspstart.c                | 10 +++++++++-
>  bsps/powerpc/ss555/start/bspstart.c                |  6 +++++-
>  bsps/powerpc/t32mppc/start/bspstart.c              |  8 +++++---
>  bsps/powerpc/tqm8xx/start/bspstart.c               |  6 +++++-
>  bsps/powerpc/virtex/start/bspstart.c               |  7 +++++--
>  bsps/powerpc/virtex4/start/bspstart.c              |  5 ++++-
>  bsps/powerpc/virtex5/start/bspstart.c              |  7 ++++---
>  bsps/shared/dev/cpucounter/cpucounterfrequency.c   | 20 +++++++++++++++++++
>  bsps/sparc/erc32/clock/ckinit.c                    | 15 +++++++++-----
>  bsps/sparc/leon3/start/cpucounter.c                | 22 ++++++++++++---------
>  c/src/lib/libbsp/arm/beagle/Makefile.am            |  1 +
>  c/src/lib/libbsp/arm/csb336/Makefile.am            |  1 +
>  c/src/lib/libbsp/arm/csb337/Makefile.am            |  1 +
>  c/src/lib/libbsp/arm/edb7312/Makefile.am           |  1 +
>  c/src/lib/libbsp/arm/gdbarmsim/Makefile.am         |  1 +
>  c/src/lib/libbsp/arm/gumstix/Makefile.am           |  1 +
>  c/src/lib/libbsp/arm/lm3s69xx/Makefile.am          |  1 +
>  c/src/lib/libbsp/arm/raspberrypi/Makefile.am       |  1 +
>  c/src/lib/libbsp/arm/rtl22xx/Makefile.am           |  1 +
>  c/src/lib/libbsp/arm/smdk2410/Makefile.am          |  1 +
>  c/src/lib/libbsp/arm/stm32f4/Makefile.am           |  1 +
>  c/src/lib/libbsp/sparc/leon2/Makefile.am           |  1 +
>  cpukit/include/rtems/counter.h                     | 12 ++++++++++-
>  cpukit/sapi/src/cpucounterconverter.c              | 18 ++++++++++++++---
>  cpukit/score/cpu/arm/include/rtems/score/cpu.h     |  2 ++
>  cpukit/score/cpu/bfin/Makefile.am                  |  1 +
>  cpukit/score/cpu/bfin/include/rtems/score/cpu.h    |  2 ++
>  cpukit/score/cpu/epiphany/Makefile.am              |  1 +
>  .../score/cpu/epiphany/include/rtems/score/cpu.h   |  2 ++
>  cpukit/score/cpu/i386/Makefile.am                  |  1 +
>  cpukit/score/cpu/i386/include/rtems/score/cpu.h    |  2 ++
>  cpukit/score/cpu/lm32/Makefile.am                  |  1 +
>  cpukit/score/cpu/lm32/include/rtems/score/cpu.h    |  2 ++
>  cpukit/score/cpu/m32c/Makefile.am                  |  1 +
>  cpukit/score/cpu/m32c/include/rtems/score/cpu.h    |  2 ++
>  cpukit/score/cpu/m68k/Makefile.am                  |  1 +
>  cpukit/score/cpu/m68k/include/rtems/score/cpu.h    |  2 ++
>  cpukit/score/cpu/mips/Makefile.am                  |  1 +
>  cpukit/score/cpu/mips/include/rtems/score/cpu.h    |  2 ++
>  cpukit/score/cpu/moxie/Makefile.am                 |  1 +
>  cpukit/score/cpu/moxie/include/rtems/score/cpu.h   |  2 ++
>  cpukit/score/cpu/nios2/Makefile.am                 |  1 +
>  cpukit/score/cpu/nios2/include/rtems/score/cpu.h   |  2 ++
>  cpukit/score/cpu/no_cpu/Makefile.am                |  1 +
>  cpukit/score/cpu/no_cpu/cpucounterfrequency.c      | 20 +++++++++++++++++++
>  cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h  |  7 +++++++
>  cpukit/score/cpu/or1k/Makefile.am                  |  3 ++-
>  cpukit/score/cpu/or1k/include/rtems/score/cpu.h    |  4 ++--
>  cpukit/score/cpu/powerpc/include/rtems/score/cpu.h |  2 ++
>  cpukit/score/cpu/riscv/Makefile.am                 |  1 +
>  cpukit/score/cpu/riscv/include/rtems/score/cpu.h   |  2 ++
>  cpukit/score/cpu/sh/Makefile.am                    |  1 +
>  cpukit/score/cpu/sh/include/rtems/score/cpu.h      |  2 ++
>  cpukit/score/cpu/sparc/include/rtems/score/cpu.h   |  2 ++
>  cpukit/score/cpu/sparc64/Makefile.am               |  1 +
>  cpukit/score/cpu/sparc64/include/rtems/score/cpu.h |  2 ++
>  cpukit/score/cpu/v850/Makefile.am                  |  1 +
>  cpukit/score/cpu/v850/include/rtems/score/cpu.h    |  2 ++
>  80 files changed, 293 insertions(+), 86 deletions(-)
>  create mode 100644 bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  create mode 100644 cpukit/score/cpu/no_cpu/cpucounterfrequency.c
>
> diff --git a/bsps/arm/altera-cyclone-v/start/bspstart.c b/bsps/arm/altera-cyclone-v/start/bspstart.c
> index 0345a4c0a7..c7eae97fdc 100644
> --- a/bsps/arm/altera-cyclone-v/start/bspstart.c
> +++ b/bsps/arm/altera-cyclone-v/start/bspstart.c
> @@ -13,7 +13,6 @@
>   */
>
>  #include <bsp/bootcard.h>
> -#include <bsp/arm-a9mpcore-clock.h>
>  #include <bsp/fdt.h>
>  #include <bsp/irq-generic.h>
>  #include <bsp/linker-symbols.h>
> @@ -95,7 +94,6 @@ static void update_clocks(void)
>  void bsp_start(void)
>  {
>    update_clocks();
> -  a9mpcore_clock_initialize_early();
>    bsp_interrupt_initialize();
>    rtems_cache_coherent_add_area(
>      bsp_section_nocacheheap_begin,
> diff --git a/bsps/arm/include/bsp/arm-a9mpcore-clock.h b/bsps/arm/include/bsp/arm-a9mpcore-clock.h
> index 9a8c653801..8d6007ba03 100644
> --- a/bsps/arm/include/bsp/arm-a9mpcore-clock.h
> +++ b/bsps/arm/include/bsp/arm-a9mpcore-clock.h
> @@ -22,15 +22,6 @@ extern "C" {
>   */
>  uint32_t a9mpcore_clock_periphclk(void);
>
> -/**
> - * @brief Do early clock initialization so that the CPU counter conversion
> - * works.
> - */
> -static inline void a9mpcore_clock_initialize_early(void)
> -{
> -  rtems_counter_initialize_converter(a9mpcore_clock_periphclk());
> -}
> -
>  #ifdef __cplusplus
>  }
>  #endif /* __cplusplus */
> diff --git a/bsps/arm/lpc176x/start/system-clocks.c b/bsps/arm/lpc176x/start/system-clocks.c
> index dd1a0308c6..2ec58727eb 100644
> --- a/bsps/arm/lpc176x/start/system-clocks.c
> +++ b/bsps/arm/lpc176x/start/system-clocks.c
> @@ -109,6 +109,11 @@ unsigned lpc176x_cclk( void )
>    return cclk;
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return LPC176X_PCLK;
> +}
> +
>  CPU_Counter_ticks _CPU_Counter_read( void )
>  {
>    return lpc176x_get_timer1();
> diff --git a/bsps/arm/lpc24xx/start/system-clocks.c b/bsps/arm/lpc24xx/start/system-clocks.c
> index f64fca1bed..8a2f62b4b0 100644
> --- a/bsps/arm/lpc24xx/start/system-clocks.c
> +++ b/bsps/arm/lpc24xx/start/system-clocks.c
> @@ -61,8 +61,11 @@ void lpc24xx_timer_initialize(void)
>
>    /* Start timer */
>    T1TCR = TCR_EN;
> +}
>
> -  rtems_counter_initialize_converter(LPC24XX_PCLK);
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return LPC24XX_PCLK;
>  }
>
>  CPU_Counter_ticks _CPU_Counter_read(void)
> diff --git a/bsps/arm/lpc32xx/start/bspstart.c b/bsps/arm/lpc32xx/start/bspstart.c
> index 7ade16bbb8..c535f766d7 100644
> --- a/bsps/arm/lpc32xx/start/bspstart.c
> +++ b/bsps/arm/lpc32xx/start/bspstart.c
> @@ -26,6 +26,11 @@
>  #include <bsp/bootcard.h>
>  #include <bsp/irq-generic.h>
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return LPC32XX_PERIPH_CLK;
> +}
> +
>  CPU_Counter_ticks _CPU_Counter_read(void)
>  {
>    return lpc32xx_timer();
> @@ -33,6 +38,5 @@ CPU_Counter_ticks _CPU_Counter_read(void)
>
>  void bsp_start(void)
>  {
> -  rtems_counter_initialize_converter(LPC32XX_PERIPH_CLK);
>    bsp_interrupt_initialize();
>  }
> diff --git a/bsps/arm/realview-pbx-a9/start/bspstart.c b/bsps/arm/realview-pbx-a9/start/bspstart.c
> index 0be515c057..8660c661c9 100644
> --- a/bsps/arm/realview-pbx-a9/start/bspstart.c
> +++ b/bsps/arm/realview-pbx-a9/start/bspstart.c
> @@ -14,11 +14,9 @@
>
>  #include <bsp.h>
>  #include <bsp/bootcard.h>
> -#include <bsp/arm-a9mpcore-clock.h>
>  #include <bsp/irq-generic.h>
>
>  void bsp_start(void)
>  {
> -  a9mpcore_clock_initialize_early();
>    bsp_interrupt_initialize();
>  }
> diff --git a/bsps/arm/shared/clock/clock-a9mpcore.c b/bsps/arm/shared/clock/clock-a9mpcore.c
> index f9b2d08c9b..a68a627c5b 100644
> --- a/bsps/arm/shared/clock/clock-a9mpcore.c
> +++ b/bsps/arm/shared/clock/clock-a9mpcore.c
> @@ -157,6 +157,11 @@ static void a9mpcore_clock_initialize(void)
>    rtems_timecounter_install(&a9mpcore_tc);
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return a9mpcore_clock_periphclk();
> +}
> +
>  CPU_Counter_ticks _CPU_Counter_read(void)
>  {
>    volatile a9mpcore_gt *gt = A9MPCORE_GT;
> diff --git a/bsps/arm/shared/clock/clock-generic-timer.c b/bsps/arm/shared/clock/clock-generic-timer.c
> index 8a992d44f4..2cb85003e1 100644
> --- a/bsps/arm/shared/clock/clock-generic-timer.c
> +++ b/bsps/arm/shared/clock/clock-generic-timer.c
> @@ -166,6 +166,11 @@ static void arm_gt_clock_initialize(void)
>    rtems_timecounter_install(tc);
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return arm_gt_clock_instance.interval;
> +}
> +
>  CPU_Counter_ticks _CPU_Counter_read(void)
>  {
>    return (uint32_t) arm_gt_clock_get_count();
> @@ -179,14 +184,12 @@ static void arm_gt_clock_early_init(void)
>      &arm_gt_clock_instance.interval,
>      &arm_gt_clock_instance.irq
>    );
> -
> -  rtems_counter_initialize_converter(arm_gt_clock_instance.interval);
>  }
>
>  RTEMS_SYSINIT_ITEM(
>    arm_gt_clock_early_init,
> -  RTEMS_SYSINIT_BSP_START,
> -  RTEMS_SYSINIT_ORDER_LAST
> +  RTEMS_SYSINIT_CPU_COUNTER,
> +  RTEMS_SYSINIT_ORDER_FIRST
>  );
>
>  #define Clock_driver_support_at_tick() \
> diff --git a/bsps/arm/shared/cpucounter/cpucounter-armv7m.c b/bsps/arm/shared/cpucounter/cpucounter-armv7m.c
> index 7d2581879f..b7593602ed 100644
> --- a/bsps/arm/shared/cpucounter/cpucounter-armv7m.c
> +++ b/bsps/arm/shared/cpucounter/cpucounter-armv7m.c
> @@ -19,6 +19,16 @@
>  #include <bsp.h>
>  #include <bsp/fatal.h>
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +#ifdef BSP_ARMV7M_SYSTICK_FREQUENCY
> +  return = BSP_ARMV7M_SYSTICK_FREQUENCY;
> +#else
> +  volatile ARMV7M_Systick *systick = _ARMV7M_Systick;
> +  return ARMV7M_SYSTICK_CALIB_TENMS_GET(systick->calib) * 100;
> +#endif
> +}
> +
>  CPU_Counter_ticks _CPU_Counter_read(void)
>  {
>    volatile ARMV7M_DWT *dwt = _ARMV7M_DWT;
> @@ -32,22 +42,13 @@ static void armv7m_cpu_counter_initialize(void)
>
>    cyccnt_enabled = _ARMV7M_DWT_Enable_CYCCNT();
>
> -  if (cyccnt_enabled) {
> -    #ifdef BSP_ARMV7M_SYSTICK_FREQUENCY
> -      uint64_t freq = BSP_ARMV7M_SYSTICK_FREQUENCY;
> -    #else
> -      volatile ARMV7M_Systick *systick = _ARMV7M_Systick;
> -      uint64_t freq = ARMV7M_SYSTICK_CALIB_TENMS_GET(systick->calib) * 100ULL;
> -    #endif
> -
> -    rtems_counter_initialize_converter(freq);
> -  } else {
> +  if (!cyccnt_enabled) {
>      bsp_fatal(BSP_ARM_ARMV7M_CPU_COUNTER_INIT);
>    }
>  }
>
>  RTEMS_SYSINIT_ITEM(
>    armv7m_cpu_counter_initialize,
> -  RTEMS_SYSINIT_BSP_START,
> +  RTEMS_SYSINIT_CPU_COUNTER,
>    RTEMS_SYSINIT_ORDER_FIRST
>  );
> diff --git a/bsps/arm/tms570/cpucounter/cpucounterread.c b/bsps/arm/tms570/cpucounter/cpucounterread.c
> index c5e62d382d..ada65a87ed 100644
> --- a/bsps/arm/tms570/cpucounter/cpucounterread.c
> +++ b/bsps/arm/tms570/cpucounter/cpucounterread.c
> @@ -46,8 +46,11 @@ static void tms570_cpu_counter_initialize(void)
>    pmcr &= ~ARM_CP15_PMCR_D;
>    pmcr |= ARM_CP15_PMCR_E;
>    arm_cp15_set_performance_monitors_control(pmcr);
> +}
>
> -  rtems_counter_initialize_converter(2 * BSP_PLL_OUT_CLOCK);
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return 2 * BSP_PLL_OUT_CLOCK;
>  }
>
>  CPU_Counter_ticks _CPU_Counter_read(void)
> @@ -57,6 +60,6 @@ CPU_Counter_ticks _CPU_Counter_read(void)
>
>  RTEMS_SYSINIT_ITEM(
>    tms570_cpu_counter_initialize,
> -  RTEMS_SYSINIT_BSP_START,
> +  RTEMS_SYSINIT_CPU_COUNTER,
>    RTEMS_SYSINIT_ORDER_FIRST
>  );
> diff --git a/bsps/arm/xilinx-zynq/start/bspstart.c b/bsps/arm/xilinx-zynq/start/bspstart.c
> index 14a20df7ef..4e975e872b 100644
> --- a/bsps/arm/xilinx-zynq/start/bspstart.c
> +++ b/bsps/arm/xilinx-zynq/start/bspstart.c
> @@ -14,7 +14,6 @@
>
>  #include <bsp.h>
>  #include <bsp/bootcard.h>
> -#include <bsp/arm-a9mpcore-clock.h>
>  #include <bsp/irq-generic.h>
>  #include <bsp/linker-symbols.h>
>
> @@ -25,7 +24,6 @@ __attribute__ ((weak)) uint32_t zynq_clock_cpu_1x(void)
>
>  void bsp_start(void)
>  {
> -  a9mpcore_clock_initialize_early();
>    bsp_interrupt_initialize();
>    rtems_cache_coherent_add_area(
>      bsp_section_nocacheheap_begin,
> diff --git a/bsps/powerpc/beatnik/start/bspstart.c b/bsps/powerpc/beatnik/start/bspstart.c
> index c3f2c0ceda..83c6d2efa6 100644
> --- a/bsps/powerpc/beatnik/start/bspstart.c
> +++ b/bsps/powerpc/beatnik/start/bspstart.c
> @@ -162,6 +162,11 @@ BSP_getBoardType( void )
>         return board_type;
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return BSP_bus_frequency / (BSP_time_base_divisor / 1000);
> +}
> +
>  /*
>   *  bsp_start
>   *
> @@ -330,9 +335,6 @@ void bsp_start( void )
>     */
>
>    bsp_clicks_per_usec = BSP_bus_frequency/(BSP_time_base_divisor * 1000);
> -  rtems_counter_initialize_converter(
> -    BSP_bus_frequency / (BSP_time_base_divisor / 1000)
> -  );
>
>  #ifdef SHOW_MORE_INIT_SETTINGS
>    printk(
> diff --git a/bsps/powerpc/gen5200/start/bspstart.c b/bsps/powerpc/gen5200/start/bspstart.c
> index 209cc7738e..8b1558ce7b 100644
> --- a/bsps/powerpc/gen5200/start/bspstart.c
> +++ b/bsps/powerpc/gen5200/start/bspstart.c
> @@ -112,6 +112,11 @@ uint32_t bsp_time_base_frequency;
>  /* Legacy */
>  uint32_t bsp_clicks_per_usec;
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return bsp_time_base_frequency;
> +}
> +
>  void bsp_start(void)
>  {
>    /*
> @@ -145,7 +150,6 @@ void bsp_start(void)
>
>    bsp_time_base_frequency = XLB_CLOCK / 4;
>    bsp_clicks_per_usec    = (XLB_CLOCK/4000000);
> -  rtems_counter_initialize_converter(bsp_time_base_frequency);
>
>    /* Initialize exception handler */
>    ppc_exc_cache_wb_check = 0;
> diff --git a/bsps/powerpc/gen83xx/start/bspstart.c b/bsps/powerpc/gen83xx/start/bspstart.c
> index cd729a8e17..4070c56347 100644
> --- a/bsps/powerpc/gen83xx/start/bspstart.c
> +++ b/bsps/powerpc/gen83xx/start/bspstart.c
> @@ -51,6 +51,11 @@ static int mpc83xx_decrementer_exception_handler( BSP_Exception_frame *frame, un
>    return 0;
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return bsp_time_base_frequency;
> +}
> +
>  void bsp_start( void)
>  {
>    rtems_status_code sc = RTEMS_SUCCESSFUL;
> @@ -92,7 +97,6 @@ void bsp_start( void)
>  #endif /* HAS_UBOOT */
>    bsp_time_base_frequency = BSP_bus_frequency / 4;
>    bsp_clicks_per_usec = bsp_time_base_frequency / 1000000;
> -  rtems_counter_initialize_converter(bsp_time_base_frequency);
>
>    /* Initialize some console parameters */
>    for (i = 0; i < console_device_count; ++i) {
> diff --git a/bsps/powerpc/haleakala/start/bspstart.c b/bsps/powerpc/haleakala/start/bspstart.c
> index 18b45f33df..5f7f5efb95 100644
> --- a/bsps/powerpc/haleakala/start/bspstart.c
> +++ b/bsps/powerpc/haleakala/start/bspstart.c
> @@ -153,6 +153,11 @@ DirectUARTWrite(const char c)
>  BSP_output_char_function_type     BSP_output_char = DirectUARTWrite;
>  BSP_polling_getchar_function_type BSP_poll_char = NULL;
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return bsp_clicks_per_usec * 1000000;
> +}
> +
>  /*===================================================================*/
>
>  void bsp_start( void )
> @@ -178,7 +183,6 @@ void bsp_start( void )
>    /* Set globals visible to clock.c */
>    /* timebase register ticks/microsecond = CPU Clk in MHz */
>    bsp_clicks_per_usec = 400;
> -  rtems_counter_initialize_converter(bsp_clicks_per_usec * 1000000);
>
>    /*
>     * Initialize default raw exception handlers.
> diff --git a/bsps/powerpc/motorola_powerpc/start/bspstart.c b/bsps/powerpc/motorola_powerpc/start/bspstart.c
> index 3ab9588af0..7fb684c759 100644
> --- a/bsps/powerpc/motorola_powerpc/start/bspstart.c
> +++ b/bsps/powerpc/motorola_powerpc/start/bspstart.c
> @@ -119,6 +119,11 @@ static unsigned int get_eumbbar(void) {
>  }
>  #endif
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return BSP_bus_frequency / (BSP_time_base_divisor / 1000);
> +}
> +
>  /*
>   *  bsp_start
>   *
> @@ -346,9 +351,6 @@ void bsp_start( void )
>     *  initialize the device driver parameters
>     */
>    bsp_clicks_per_usec   = BSP_bus_frequency/(BSP_time_base_divisor * 1000);
> -  rtems_counter_initialize_converter(
> -    BSP_bus_frequency / (BSP_time_base_divisor / 1000)
> -  );
>
>    /*
>     * Initalize RTEMS IRQ system
> diff --git a/bsps/powerpc/mpc55xxevb/start/bspstart.c b/bsps/powerpc/mpc55xxevb/start/bspstart.c
> index 9042fc3864..34d59a9ac2 100644
> --- a/bsps/powerpc/mpc55xxevb/start/bspstart.c
> +++ b/bsps/powerpc/mpc55xxevb/start/bspstart.c
> @@ -63,6 +63,11 @@ static void null_pointer_protection(void)
>  #endif
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +       return bsp_clock_speed;
> +}
> +
>  void bsp_start(void)
>  {
>         null_pointer_protection();
> @@ -82,7 +87,6 @@ void bsp_start(void)
>
>         /* Time reference value */
>         bsp_clicks_per_usec = bsp_clock_speed / 1000000;
> -       rtems_counter_initialize_converter(bsp_clock_speed);
>
>         /* Initialize exceptions */
>         ppc_exc_initialize_with_vector_base(
> diff --git a/bsps/powerpc/mpc8260ads/start/bspstart.c b/bsps/powerpc/mpc8260ads/start/bspstart.c
> index 44ec072775..6f1cc72a2c 100644
> --- a/bsps/powerpc/mpc8260ads/start/bspstart.c
> +++ b/bsps/powerpc/mpc8260ads/start/bspstart.c
> @@ -114,6 +114,11 @@ static void _BSP_Uart2_enable(void)
>    csr->bcsr1 &= ~UART2_E;              /* Enable Uart2 */
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return bsp_clock_speed;
> +}
> +
>  void bsp_start(void)
>  {
>    /* Set MPC8260ADS board LEDS and Uart enable lines */
> @@ -171,7 +176,6 @@ void bsp_start(void)
>    bsp_serial_cts_rts        = 0;
>    bsp_serial_rate           = 9600;
>    bsp_clock_speed         = 40000000;
> -  rtems_counter_initialize_converter(bsp_clock_speed);
>
>  #ifdef REV_0_2
>    /* set up some board specific registers */
> diff --git a/bsps/powerpc/mvme3100/start/bspstart.c b/bsps/powerpc/mvme3100/start/bspstart.c
> index 27b483332c..a073baa784 100644
> --- a/bsps/powerpc/mvme3100/start/bspstart.c
> +++ b/bsps/powerpc/mvme3100/start/bspstart.c
> @@ -192,6 +192,11 @@ BSP_calc_freqs( void )
>    printk("CPU Clock Freq:                    %10u Hz\n", BSP_processor_frequency);
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return BSP_bus_frequency / (BSP_time_base_divisor / 1000);
> +}
> +
>  /*
>   *  bsp_start
>   *
> @@ -367,9 +372,6 @@ VpdBufRec          vpdData [] = {
>    _BSP_clear_hostbridge_errors(0 /* enableMCP */, 0/*quiet*/);
>
>    bsp_clicks_per_usec = BSP_bus_frequency/(BSP_time_base_divisor * 1000);
> -  rtems_counter_initialize_converter(
> -    BSP_bus_frequency / (BSP_time_base_divisor / 1000)
> -  );
>
>    /*
>     * Initalize RTEMS IRQ system
> diff --git a/bsps/powerpc/mvme5500/start/bspstart.c b/bsps/powerpc/mvme5500/start/bspstart.c
> index 279524eb8f..fc7057613a 100644
> --- a/bsps/powerpc/mvme5500/start/bspstart.c
> +++ b/bsps/powerpc/mvme5500/start/bspstart.c
> @@ -169,6 +169,11 @@ save_boot_params(
>    return cmdline_buf;
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return BSP_bus_frequency / (BSP_time_base_divisor / 1000);
> +}
> +
>  void bsp_start( void )
>  {
>  #ifdef CONF_VPD
> @@ -265,9 +270,6 @@ void bsp_start( void )
>    /* P94 : 7455 TB/DECR is clocked by the system bus clock frequency */
>
>    bsp_clicks_per_usec    = BSP_bus_frequency/(BSP_time_base_divisor * 1000);
> -  rtems_counter_initialize_converter(
> -    BSP_bus_frequency / (BSP_time_base_divisor / 1000)
> -  );
>
>    /*
>     * Initalize RTEMS IRQ system
> diff --git a/bsps/powerpc/psim/start/bspstart.c b/bsps/powerpc/psim/start/bspstart.c
> index 3a9809c022..1250715275 100644
> --- a/bsps/powerpc/psim/start/bspstart.c
> +++ b/bsps/powerpc/psim/start/bspstart.c
> @@ -60,6 +60,11 @@ unsigned int BSP_time_base_divisor;
>
>  extern unsigned long __rtems_end[];
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return bsp_clicks_per_usec * 1000000;
> +}
> +
>  /*
>   *  bsp_start
>   *
> @@ -81,7 +86,6 @@ void bsp_start( void )
>    BSP_bus_frequency        = (unsigned int)PSIM_INSTRUCTIONS_PER_MICROSECOND;
>    bsp_clicks_per_usec      = BSP_bus_frequency;
>    BSP_time_base_divisor    = 1;
> -  rtems_counter_initialize_converter(bsp_clicks_per_usec * 1000000);
>
>    /*
>     * Initialize default raw exception handlers.
> diff --git a/bsps/powerpc/qemuppc/start/bspstart.c b/bsps/powerpc/qemuppc/start/bspstart.c
> index 94d7f4b84d..15cf9d4207 100644
> --- a/bsps/powerpc/qemuppc/start/bspstart.c
> +++ b/bsps/powerpc/qemuppc/start/bspstart.c
> @@ -54,6 +54,11 @@ static int default_decrementer_exception_handler( BSP_Exception_frame *frame, un
>    return 0;
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return bsp_time_base_frequency;
> +}
> +
>  /*
>   *  bsp_start
>   *
> @@ -80,7 +85,6 @@ void bsp_start( void )
>    BSP_bus_frequency        = 20;
>    bsp_time_base_frequency  = 20000000;
>    bsp_clicks_per_usec      = BSP_bus_frequency;
> -  rtems_counter_initialize_converter(bsp_time_base_frequency);
>
>    /*
>     * Initialize the interrupt related settings.
> diff --git a/bsps/powerpc/qoriq/start/bspstart.c b/bsps/powerpc/qoriq/start/bspstart.c
> index 7d9fa0d3c7..cc7902428b 100644
> --- a/bsps/powerpc/qoriq/start/bspstart.c
> +++ b/bsps/powerpc/qoriq/start/bspstart.c
> @@ -54,6 +54,15 @@ uint32_t bsp_time_base_frequency;
>
>  uint32_t qoriq_clock_frequency;
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +#ifdef __PPC_CPU_E6500__
> +  return qoriq_clock_frequency;
> +#else
> +  return bsp_time_base_frequency;
> +#endif
> +}
> +
>  static void initialize_frequency_parameters(void)
>  {
>    const void *fdt = bsp_fdt_get();
> @@ -82,7 +91,6 @@ static void initialize_frequency_parameters(void)
>      }
>      qoriq_clock_frequency = fdt32_to_cpu(*val_fdt);
>    #endif
> -  rtems_counter_initialize_converter(fdt32_to_cpu(*val_fdt));
>  }
>
>  #define MTIVPR(base) \
> diff --git a/bsps/powerpc/ss555/start/bspstart.c b/bsps/powerpc/ss555/start/bspstart.c
> index f47ca7d5be..cf54d61d9e 100644
> --- a/bsps/powerpc/ss555/start/bspstart.c
> +++ b/bsps/powerpc/ss555/start/bspstart.c
> @@ -40,6 +40,11 @@ extern unsigned long intrStackPtr;
>  uint32_t   bsp_clicks_per_usec;
>  uint32_t   bsp_clock_speed;           /* Serial clocks per second */
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return BSP_CRYSTAL_HZ / 4;
> +}
> +
>  /*
>   *  bsp_start()
>   *
> @@ -88,7 +93,6 @@ void bsp_start(void)
>     */
>    bsp_clicks_per_usec = BSP_CRYSTAL_HZ / 4 / 1000000;
>    bsp_clock_speed     = BSP_CLOCK_HZ;  /* for SCI baud rate generator */
> -  rtems_counter_initialize_converter(BSP_CRYSTAL_HZ / 4);
>
>    /*
>     * Initalize RTEMS IRQ system
> diff --git a/bsps/powerpc/t32mppc/start/bspstart.c b/bsps/powerpc/t32mppc/start/bspstart.c
> index 5fc36b4019..e8f288df59 100644
> --- a/bsps/powerpc/t32mppc/start/bspstart.c
> +++ b/bsps/powerpc/t32mppc/start/bspstart.c
> @@ -77,13 +77,15 @@ static void t32mppc_initialize_exceptions(void *interrupt_stack_begin)
>    MTIVOR(BOOKE_IVOR35, addr);
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return bsp_time_base_frequency;
> +}
> +
>  void bsp_start(void)
>  {
>    get_ppc_cpu_type();
>    get_ppc_cpu_revision();
> -
> -  rtems_counter_initialize_converter(bsp_time_base_frequency);
> -
>    t32mppc_initialize_exceptions(bsp_section_work_begin);
>    bsp_interrupt_initialize();
>  }
> diff --git a/bsps/powerpc/tqm8xx/start/bspstart.c b/bsps/powerpc/tqm8xx/start/bspstart.c
> index df0581ce77..b2d765c9c4 100644
> --- a/bsps/powerpc/tqm8xx/start/bspstart.c
> +++ b/bsps/powerpc/tqm8xx/start/bspstart.c
> @@ -92,6 +92,11 @@ static rtems_status_code  bsp_tqm_get_cib_uint32( const char *cib_id,
>    return RTEMS_SUCCESSFUL;
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return bsp_time_base_frequency;
> +}
> +
>  void bsp_start( void)
>  {
>
> @@ -142,7 +147,6 @@ void bsp_start( void)
>
>    bsp_time_base_frequency = BSP_bus_frequency / 16;
>    bsp_clicks_per_usec = bsp_time_base_frequency / 1000000;
> -  rtems_counter_initialize_converter(bsp_time_base_frequency);
>
>    /* Initialize exception handler */
>    ppc_exc_initialize(interrupt_stack_start, interrupt_stack_size);
> diff --git a/bsps/powerpc/virtex/start/bspstart.c b/bsps/powerpc/virtex/start/bspstart.c
> index 5b4a4a135f..be7f00437a 100644
> --- a/bsps/powerpc/virtex/start/bspstart.c
> +++ b/bsps/powerpc/virtex/start/bspstart.c
> @@ -74,6 +74,11 @@ LINKER_SYMBOL(virtex_exc_vector_base);
>   */
>  uint32_t bsp_time_base_frequency = XPAR_CPU_PPC405_CORE_CLOCK_FREQ_HZ;
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return bsp_time_base_frequency;
> +}
> +
>  /*
>   *  bsp_start
>   *
> @@ -89,8 +94,6 @@ void bsp_start( void )
>    get_ppc_cpu_type();
>    get_ppc_cpu_revision();
>
> -  rtems_counter_initialize_converter(bsp_time_base_frequency);
> -
>    /*
>     * Initialize default raw exception handlers.
>     */
> diff --git a/bsps/powerpc/virtex4/start/bspstart.c b/bsps/powerpc/virtex4/start/bspstart.c
> index d5c255be6d..40cd710a58 100644
> --- a/bsps/powerpc/virtex4/start/bspstart.c
> +++ b/bsps/powerpc/virtex4/start/bspstart.c
> @@ -130,6 +130,10 @@ void BSP_ask_for_reset(void)
>    for(;;);
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return bsp_clicks_per_usec * 1000000;
> +}
>
>  /*===================================================================*/
>
> @@ -166,7 +170,6 @@ void bsp_start(void)
>
>    /* Timebase register ticks/microsecond;  The application may override these */
>    bsp_clicks_per_usec        = 350;
> -  rtems_counter_initialize_converter(bsp_clicks_per_usec * 1000000);
>
>    /*
>     * Initialize the interrupt related settings.
> diff --git a/bsps/powerpc/virtex5/start/bspstart.c b/bsps/powerpc/virtex5/start/bspstart.c
> index ff821574a9..6457143d20 100644
> --- a/bsps/powerpc/virtex5/start/bspstart.c
> +++ b/bsps/powerpc/virtex5/start/bspstart.c
> @@ -144,6 +144,10 @@ void BSP_ask_for_reset(void)
>    for(;;);
>  }
>
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return BSP_bus_frequency / (BSP_time_base_divisor / 1000);
> +}
>
>  /*===================================================================*/
>
> @@ -185,9 +189,6 @@ void bsp_start(void)
>
>    /* Timebase register ticks/microsecond;  The application may override these */
>    bsp_clicks_per_usec        = BSP_bus_frequency/(BSP_time_base_divisor * 1000);
> -  rtems_counter_initialize_converter(
> -    BSP_bus_frequency / (BSP_time_base_divisor / 1000)
> -  );
>
>    /*
>     * Initialize the interrupt related settings.
> diff --git a/bsps/shared/dev/cpucounter/cpucounterfrequency.c b/bsps/shared/dev/cpucounter/cpucounterfrequency.c
> new file mode 100644
> index 0000000000..bbb8c127fe
> --- /dev/null
> +++ b/bsps/shared/dev/cpucounter/cpucounterfrequency.c
> @@ -0,0 +1,20 @@
> +/*
> + * Copyright (c) 2018 embedded brains GmbH.  All rights reserved.
> + *
> + *  embedded brains GmbH
> + *  Dornierstr. 4
> + *  82178 Puchheim
> + *  Germany
> + *  <rtems at embedded-brains.de>
> + *
> + * The license and distribution terms for this file may be
> + * found in the file LICENSE in this distribution or at
> + * http://www.rtems.org/license/LICENSE.
> + */
> +
> +#include <rtems/score/cpu.h>
> +
> +uint32_t _CPU_Counter_frequency( void )
> +{
> +  return 1000000000;
> +}
> diff --git a/bsps/sparc/erc32/clock/ckinit.c b/bsps/sparc/erc32/clock/ckinit.c
> index 7f8c0f5aad..e54061abac 100644
> --- a/bsps/sparc/erc32/clock/ckinit.c
> +++ b/bsps/sparc/erc32/clock/ckinit.c
> @@ -28,6 +28,8 @@
>  #include <rtems/timecounter.h>
>  #include <rtems/score/sparcimpl.h>
>
> +#define ERC32_REAL_TIME_CLOCK_FREQUENCY 1000000
> +
>  /*
>   *  The Real Time Clock Counter Timer uses this trap type.
>   */
> @@ -78,19 +80,22 @@ static void erc32_tc_tick( void )
>    );
>  }
>
> -static void erc32_counter_initialize( uint32_t frequency )
> +static void erc32_counter_initialize( void )
>  {
>    _SPARC_Counter_initialize(
>      _SPARC_Counter_read_address,
>      _SPARC_Counter_difference_clock_period,
>      &ERC32_MEC.Real_Time_Clock_Counter
>    );
> -  rtems_counter_initialize_converter( frequency );
> +}
> +
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return ERC32_REAL_TIME_CLOCK_FREQUENCY;
>  }
>
>  #define Clock_driver_support_initialize_hardware() \
>    do { \
> -    uint32_t frequency = 1000000; \
>      /* approximately 1 us per countdown */ \
>      ERC32_MEC.Real_Time_Clock_Scalar  = CLOCK_SPEED - 1; \
>      ERC32_MEC.Real_Time_Clock_Counter = \
> @@ -108,11 +113,11 @@ static void erc32_counter_initialize( uint32_t frequency )
>      );  \
>      rtems_timecounter_simple_install( \
>          &erc32_tc, \
> -        frequency, \
> +        ERC32_REAL_TIME_CLOCK_FREQUENCY, \
>          rtems_configuration_get_microseconds_per_tick(), \
>          erc32_tc_get_timecount \
>      ); \
> -    erc32_counter_initialize( frequency ); \
> +    erc32_counter_initialize(); \
>    } while (0)
>
>  #define Clock_driver_timecounter_tick() erc32_tc_tick()
> diff --git a/bsps/sparc/leon3/start/cpucounter.c b/bsps/sparc/leon3/start/cpucounter.c
> index 87554ce550..2df1409209 100644
> --- a/bsps/sparc/leon3/start/cpucounter.c
> +++ b/bsps/sparc/leon3/start/cpucounter.c
> @@ -18,11 +18,17 @@
>  #include <rtems/sysinit.h>
>  #include <rtems/score/sparcimpl.h>
>
> +static uint32_t leon3_counter_frequency = 1000000000;
> +
> +uint32_t _CPU_Counter_frequency(void)
> +{
> +  return leon3_up_counter_frequency;
> +}
> +
>  static void leon3_counter_initialize(void)
>  {
>    volatile struct irqmp_timestamp_regs *irqmp_ts;
>    volatile struct gptimer_regs *gpt;
> -  unsigned int freq;
>
>    irqmp_ts = &LEON3_IrqCtrl_Regs->timestamp[0];
>    gpt = LEON3_Timer_Regs;
> @@ -38,8 +44,7 @@ static void leon3_counter_initialize(void)
>        NULL
>      );
>
> -    freq = leon3_up_counter_frequency();
> -    rtems_counter_initialize_converter(freq);
> +    leon3_counter_frequency = leon3_up_counter_frequency();
>    } else if (leon3_irqmp_has_timestamp(irqmp_ts)) {
>      /* Use the interrupt controller timestamp counter if available */
>
> @@ -52,8 +57,7 @@ static void leon3_counter_initialize(void)
>        (volatile const uint32_t *) &irqmp_ts->counter
>      );
>
> -    freq = ambapp_freq_get(&ambapp_plb, LEON3_IrqCtrl_Adev);
> -    rtems_counter_initialize_converter(freq);
> +    leon3_counter_frequency = ambapp_freq_get(&ambapp_plb, LEON3_IrqCtrl_Adev);
>    } else if (gpt != NULL) {
>      /* Fall back to the first GPTIMER if available */
>
> @@ -66,15 +70,15 @@ static void leon3_counter_initialize(void)
>        (volatile const uint32_t *) &gpt->timer[LEON3_CLOCK_INDEX].value
>      );
>
> -    freq = ambapp_freq_get(&ambapp_plb, LEON3_Timer_Adev);
> -    rtems_counter_initialize_converter(freq / (gpt->scaler_reload - 1));
> +    leon3_counter_frequency = ambapp_freq_get(&ambapp_plb, LEON3_Timer_Adev) /
> +      (gpt->scaler_reload - 1);
>    }
>  }
>
>  RTEMS_SYSINIT_ITEM(
>    leon3_counter_initialize,
> -  RTEMS_SYSINIT_BSP_START,
> -  RTEMS_SYSINIT_ORDER_THIRD
> +  RTEMS_SYSINIT_CPU_COUNTER,
> +  RTEMS_SYSINIT_ORDER_FIRST
>  );
>
>  SPARC_COUNTER_DEFINITION;
> diff --git a/c/src/lib/libbsp/arm/beagle/Makefile.am b/c/src/lib/libbsp/arm/beagle/Makefile.am
> index 191d2cae2c..03f57758e9 100644
> --- a/c/src/lib/libbsp/arm/beagle/Makefile.am
> +++ b/c/src/lib/libbsp/arm/beagle/Makefile.am
> @@ -46,6 +46,7 @@ librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/stackalloc.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/gpio/gpio-support.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterdiff.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/btimer/btimer-stub.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/shared/start/bsp-start-memcpy.S
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/shared/cp15/arm-cp15-set-exception-handler.c
> diff --git a/c/src/lib/libbsp/arm/csb336/Makefile.am b/c/src/lib/libbsp/arm/csb336/Makefile.am
> index f2f142edbc..0ef7b9a725 100644
> --- a/c/src/lib/libbsp/arm/csb336/Makefile.am
> +++ b/c/src/lib/libbsp/arm/csb336/Makefile.am
> @@ -25,6 +25,7 @@ librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspreset-empty.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/csb336/start/memmap.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/getentropy/getentropy-cpucounter.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/sbrk.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterdiff.c
>  librtemsbsp_a_SOURCES +=../../../../../../bsps/arm/csb336/clock/clockdrv.c
> diff --git a/c/src/lib/libbsp/arm/csb337/Makefile.am b/c/src/lib/libbsp/arm/csb337/Makefile.am
> index f8be23696a..29921c4fb0 100644
> --- a/c/src/lib/libbsp/arm/csb337/Makefile.am
> +++ b/c/src/lib/libbsp/arm/csb337/Makefile.am
> @@ -34,6 +34,7 @@ librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/csb337/start/bspreset.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/csb337/start/memmap.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/sbrk.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/getentropy/getentropy-cpucounter.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterdiff.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/csb337/start/pmc.c
> diff --git a/c/src/lib/libbsp/arm/edb7312/Makefile.am b/c/src/lib/libbsp/arm/edb7312/Makefile.am
> index b30b34f7f5..e48f08b552 100644
> --- a/c/src/lib/libbsp/arm/edb7312/Makefile.am
> +++ b/c/src/lib/libbsp/arm/edb7312/Makefile.am
> @@ -23,6 +23,7 @@ librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspfatal-default.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/sbrk.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/getentropy/getentropy-cpucounter.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/edb7312/start/bspreset.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterdiff.c
>
> diff --git a/c/src/lib/libbsp/arm/gdbarmsim/Makefile.am b/c/src/lib/libbsp/arm/gdbarmsim/Makefile.am
> index 5882601892..685870a661 100644
> --- a/c/src/lib/libbsp/arm/gdbarmsim/Makefile.am
> +++ b/c/src/lib/libbsp/arm/gdbarmsim/Makefile.am
> @@ -25,6 +25,7 @@ librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/gdbarmsim/start/bspreset.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/getentropy/getentropy-cpucounter.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/sbrk.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/gdbarmsim/start/syscalls.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterdiff.c
>  # console
> diff --git a/c/src/lib/libbsp/arm/gumstix/Makefile.am b/c/src/lib/libbsp/arm/gumstix/Makefile.am
> index 810d636612..4f41719b93 100644
> --- a/c/src/lib/libbsp/arm/gumstix/Makefile.am
> +++ b/c/src/lib/libbsp/arm/gumstix/Makefile.am
> @@ -24,6 +24,7 @@ librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspfatal-default.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/gumstix/start/bspstart.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/gumstix/start/bspreset.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/gumstix/start/memmap.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterdiff.c
>  librtemsbsp_a_SOURCES +=../../../../../../bsps/arm/gumstix/clock/clock.c
> diff --git a/c/src/lib/libbsp/arm/lm3s69xx/Makefile.am b/c/src/lib/libbsp/arm/lm3s69xx/Makefile.am
> index b92fa4df1c..feffa3093f 100644
> --- a/c/src/lib/libbsp/arm/lm3s69xx/Makefile.am
> +++ b/c/src/lib/libbsp/arm/lm3s69xx/Makefile.am
> @@ -34,6 +34,7 @@ librtemsbsp_a_SOURCES =
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/getentropy/getentropy-cpucounter.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspfatal-default.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspgetworkarea-default.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterdiff.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/sbrk.c
> diff --git a/c/src/lib/libbsp/arm/raspberrypi/Makefile.am b/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
> index b4887ceedc..13f9696c17 100644
> --- a/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
> +++ b/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
> @@ -39,6 +39,7 @@ librtemsbsp_a_SOURCES =
>  # Shared
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/getentropy/getentropy-cpucounter.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspfatal-default.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterdiff.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/sbrk.c
> diff --git a/c/src/lib/libbsp/arm/rtl22xx/Makefile.am b/c/src/lib/libbsp/arm/rtl22xx/Makefile.am
> index 5227f3b291..c34d812885 100644
> --- a/c/src/lib/libbsp/arm/rtl22xx/Makefile.am
> +++ b/c/src/lib/libbsp/arm/rtl22xx/Makefile.am
> @@ -25,6 +25,7 @@ librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspfatal-default.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/rtl22xx/start/bspreset.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/sbrk.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/getentropy/getentropy-cpucounter.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterdiff.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/rtl22xx/btimer/btimer.c
> diff --git a/c/src/lib/libbsp/arm/smdk2410/Makefile.am b/c/src/lib/libbsp/arm/smdk2410/Makefile.am
> index a13803560d..6e57275e59 100644
> --- a/c/src/lib/libbsp/arm/smdk2410/Makefile.am
> +++ b/c/src/lib/libbsp/arm/smdk2410/Makefile.am
> @@ -25,6 +25,7 @@ librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/getentropy/getentropy
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/sbrk.c
>
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspgetworkarea-default.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterdiff.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/arm/smdk2410/btimer/btimer.c
> diff --git a/c/src/lib/libbsp/arm/stm32f4/Makefile.am b/c/src/lib/libbsp/arm/stm32f4/Makefile.am
> index 5f4be7dc71..70fee358f0 100644
> --- a/c/src/lib/libbsp/arm/stm32f4/Makefile.am
> +++ b/c/src/lib/libbsp/arm/stm32f4/Makefile.am
> @@ -33,6 +33,7 @@ librtemsbsp_a_SOURCES =
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/getentropy/getentropy-cpucounter.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspfatal-default.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspgetworkarea-default.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterdiff.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/sbrk.c
> diff --git a/c/src/lib/libbsp/sparc/leon2/Makefile.am b/c/src/lib/libbsp/sparc/leon2/Makefile.am
> index face1420bf..cd36515f6c 100644
> --- a/c/src/lib/libbsp/sparc/leon2/Makefile.am
> +++ b/c/src/lib/libbsp/sparc/leon2/Makefile.am
> @@ -26,6 +26,7 @@ librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspfatal-default.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspreset-empty.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/sparc/leon2/start/bspstart.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/sparc/shared/start/bspgetworkarea.c
> +librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/getentropy/getentropy-cpucounter.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/sbrk.c
>  librtemsbsp_a_SOURCES += ../../../../../../bsps/sparc/leon2/start/setvec.c
> diff --git a/cpukit/include/rtems/counter.h b/cpukit/include/rtems/counter.h
> index 3b428402a8..e770c96eb0 100644
> --- a/cpukit/include/rtems/counter.h
> +++ b/cpukit/include/rtems/counter.h
> @@ -7,7 +7,7 @@
>   */
>
>  /*
> - * Copyright (c) 2014 embedded brains GmbH.  All rights reserved.
> + * Copyright (c) 2014, 2018 embedded brains GmbH.  All rights reserved.
>   *
>   *  embedded brains GmbH
>   *  Dornierstr. 4
> @@ -62,6 +62,16 @@ extern "C" {
>  typedef CPU_Counter_ticks rtems_counter_ticks;
>
>  /**
> + * @brief Returns the current counter frequency in Hz.
> + *
> + * @return The current counter frequency in Hz.
> + */
> +static inline uint32_t rtems_counter_frequency( void )
> +{
> +  return _CPU_Counter_frequency();
> +}
> +
> +/**
>   * @brief Reads the current counter values.
>   *
>   * @return The current counter values.
> diff --git a/cpukit/sapi/src/cpucounterconverter.c b/cpukit/sapi/src/cpucounterconverter.c
> index b896e4cc7f..12d55362df 100644
> --- a/cpukit/sapi/src/cpucounterconverter.c
> +++ b/cpukit/sapi/src/cpucounterconverter.c
> @@ -1,5 +1,5 @@
>  /*
> - * Copyright (c) 2014 embedded brains GmbH.  All rights reserved.
> + * Copyright (c) 2014, 2018 embedded brains GmbH.  All rights reserved.
>   *
>   *  embedded brains GmbH
>   *  Dornierstr. 4
> @@ -13,12 +13,13 @@
>   */
>
>  #include <rtems/counter.h>
> +#include <rtems/sysinit.h>
>
>  RTEMS_STATIC_ASSERT(sizeof(rtems_counter_ticks) <= sizeof(uint32_t), type);
>
> -static uint64_t to_ns_scaler = UINT64_C(1) << 32;
> +static uint64_t to_ns_scaler;
>
> -static uint64_t from_ns_scaler = UINT64_C(1) << 32;
> +static uint64_t from_ns_scaler;
>
>  uint64_t rtems_counter_ticks_to_nanoseconds( rtems_counter_ticks counter )
>  {
> @@ -37,3 +38,14 @@ void rtems_counter_initialize_converter( uint32_t frequency )
>    to_ns_scaler = ((ns_per_s << 32) + frequency - 1) / frequency;
>    from_ns_scaler = ((UINT64_C(1) << 32) * frequency + ns_per_s - 1) / ns_per_s;
>  }
> +
> +static void rtems_counter_sysinit( void )
> +{
> +  rtems_counter_initialize_converter( rtems_counter_frequency() );
> +}
> +
> +RTEMS_SYSINIT_ITEM(
> +  rtems_counter_sysinit,
> +  RTEMS_SYSINIT_CPU_COUNTER,
> +  RTEMS_SYSINIT_ORDER_LAST
> +);
> diff --git a/cpukit/score/cpu/arm/include/rtems/score/cpu.h b/cpukit/score/cpu/arm/include/rtems/score/cpu.h
> index 728a43c528..7ea6980959 100644
> --- a/cpukit/score/cpu/arm/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/arm/include/rtems/score/cpu.h
> @@ -596,6 +596,8 @@ static inline uint16_t CPU_swap_u16( uint16_t value )
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/bfin/Makefile.am b/cpukit/score/cpu/bfin/Makefile.am
> index 3d7483a220..7febda59b6 100644
> --- a/cpukit/score/cpu/bfin/Makefile.am
> +++ b/cpukit/score/cpu/bfin/Makefile.am
> @@ -2,6 +2,7 @@ include $(top_srcdir)/automake/compile.am
>
>  noinst_LIBRARIES = libscorecpu.a
>  libscorecpu_a_SOURCES = cpu.c cpu_asm.S
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
>  libscorecpu_a_SOURCES += bfin-exception-frame-print.c
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
> diff --git a/cpukit/score/cpu/bfin/include/rtems/score/cpu.h b/cpukit/score/cpu/bfin/include/rtems/score/cpu.h
> index d2c2cade08..a361e023ed 100644
> --- a/cpukit/score/cpu/bfin/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/bfin/include/rtems/score/cpu.h
> @@ -982,6 +982,8 @@ static inline uint32_t CPU_swap_u32(
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/epiphany/Makefile.am b/cpukit/score/cpu/epiphany/Makefile.am
> index 659dd6f554..0c75bcdcd5 100644
> --- a/cpukit/score/cpu/epiphany/Makefile.am
> +++ b/cpukit/score/cpu/epiphany/Makefile.am
> @@ -8,6 +8,7 @@ libscorecpu_a_SOURCES  = cpu.c
>  libscorecpu_a_SOURCES += epiphany-exception-handler.S
>  libscorecpu_a_SOURCES += epiphany-context-switch.S
>  libscorecpu_a_SOURCES += epiphany-context-initialize.c
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += setjmp.S
>
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
> diff --git a/cpukit/score/cpu/epiphany/include/rtems/score/cpu.h b/cpukit/score/cpu/epiphany/include/rtems/score/cpu.h
> index 8979381259..84565d15d2 100644
> --- a/cpukit/score/cpu/epiphany/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/epiphany/include/rtems/score/cpu.h
> @@ -854,6 +854,8 @@ static inline void _CPU_Context_validate( uintptr_t pattern )
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/i386/Makefile.am b/cpukit/score/cpu/i386/Makefile.am
> index fe7fa5582c..b03d8593c4 100644
> --- a/cpukit/score/cpu/i386/Makefile.am
> +++ b/cpukit/score/cpu/i386/Makefile.am
> @@ -2,6 +2,7 @@ include $(top_srcdir)/automake/compile.am
>
>  noinst_LIBRARIES = libscorecpu.a
>  libscorecpu_a_SOURCES = cpu.c cpu_asm.S
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
>
> diff --git a/cpukit/score/cpu/i386/include/rtems/score/cpu.h b/cpukit/score/cpu/i386/include/rtems/score/cpu.h
> index 42958c00f0..0986663be1 100644
> --- a/cpukit/score/cpu/i386/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/i386/include/rtems/score/cpu.h
> @@ -697,6 +697,8 @@ void _CPU_Exception_frame_print( const CPU_Exception_frame *frame );
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/lm32/Makefile.am b/cpukit/score/cpu/lm32/Makefile.am
> index 75bcba5793..795a6be283 100644
> --- a/cpukit/score/cpu/lm32/Makefile.am
> +++ b/cpukit/score/cpu/lm32/Makefile.am
> @@ -2,6 +2,7 @@ include $(top_srcdir)/automake/compile.am
>
>  noinst_LIBRARIES = libscorecpu.a
>  libscorecpu_a_SOURCES = cpu.c cpu_asm.S irq.c
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
>  libscorecpu_a_SOURCES += lm32-exception-frame-print.c
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
> diff --git a/cpukit/score/cpu/lm32/include/rtems/score/cpu.h b/cpukit/score/cpu/lm32/include/rtems/score/cpu.h
> index f36e00e404..fe8107c51b 100644
> --- a/cpukit/score/cpu/lm32/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/lm32/include/rtems/score/cpu.h
> @@ -1018,6 +1018,8 @@ static inline uint16_t CPU_swap_u16(uint16_t v)
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/m32c/Makefile.am b/cpukit/score/cpu/m32c/Makefile.am
> index 22bec7fce0..6695d35c77 100644
> --- a/cpukit/score/cpu/m32c/Makefile.am
> +++ b/cpukit/score/cpu/m32c/Makefile.am
> @@ -3,6 +3,7 @@ include $(top_srcdir)/automake/compile.am
>  noinst_LIBRARIES = libscorecpu.a
>  libscorecpu_a_SOURCES = cpu.c cpu_asm.c context_switch.S context_init.c \
>      varvects.S
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
>  libscorecpu_a_SOURCES += m32c-exception-frame-print.c
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
> diff --git a/cpukit/score/cpu/m32c/include/rtems/score/cpu.h b/cpukit/score/cpu/m32c/include/rtems/score/cpu.h
> index ec0e71c286..c5486e80d6 100644
> --- a/cpukit/score/cpu/m32c/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/m32c/include/rtems/score/cpu.h
> @@ -968,6 +968,8 @@ static inline uint32_t CPU_swap_u32(
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/m68k/Makefile.am b/cpukit/score/cpu/m68k/Makefile.am
> index 68fd3a253a..e02b4ab600 100644
> --- a/cpukit/score/cpu/m68k/Makefile.am
> +++ b/cpukit/score/cpu/m68k/Makefile.am
> @@ -4,6 +4,7 @@ noinst_LIBRARIES = libscorecpu.a
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
>
>  libscorecpu_a_SOURCES = cpu.c cpu_asm.S
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
>  libscorecpu_a_SOURCES += m68k-exception-frame-print.c
>  libscorecpu_a_SOURCES += __m68k_read_tp.c
> diff --git a/cpukit/score/cpu/m68k/include/rtems/score/cpu.h b/cpukit/score/cpu/m68k/include/rtems/score/cpu.h
> index 9b140d0da3..459ef8a9cd 100644
> --- a/cpukit/score/cpu/m68k/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/m68k/include/rtems/score/cpu.h
> @@ -679,6 +679,8 @@ void _CPU_Exception_frame_print(
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/mips/Makefile.am b/cpukit/score/cpu/mips/Makefile.am
> index fe7fa5582c..b03d8593c4 100644
> --- a/cpukit/score/cpu/mips/Makefile.am
> +++ b/cpukit/score/cpu/mips/Makefile.am
> @@ -2,6 +2,7 @@ include $(top_srcdir)/automake/compile.am
>
>  noinst_LIBRARIES = libscorecpu.a
>  libscorecpu_a_SOURCES = cpu.c cpu_asm.S
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
>
> diff --git a/cpukit/score/cpu/mips/include/rtems/score/cpu.h b/cpukit/score/cpu/mips/include/rtems/score/cpu.h
> index acc4ef81ec..46d1eb28e8 100644
> --- a/cpukit/score/cpu/mips/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/mips/include/rtems/score/cpu.h
> @@ -988,6 +988,8 @@ static inline uint32_t CPU_swap_u32(
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/moxie/Makefile.am b/cpukit/score/cpu/moxie/Makefile.am
> index 29c9a656c5..d5e8952693 100644
> --- a/cpukit/score/cpu/moxie/Makefile.am
> +++ b/cpukit/score/cpu/moxie/Makefile.am
> @@ -6,6 +6,7 @@ include $(top_srcdir)/automake/compile.am
>
>  noinst_LIBRARIES = libscorecpu.a
>  libscorecpu_a_SOURCES = cpu.c moxie-exception-frame-print.c cpu_asm.S
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
>
> diff --git a/cpukit/score/cpu/moxie/include/rtems/score/cpu.h b/cpukit/score/cpu/moxie/include/rtems/score/cpu.h
> index 7ab3e373b4..403b05f9fb 100644
> --- a/cpukit/score/cpu/moxie/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/moxie/include/rtems/score/cpu.h
> @@ -835,6 +835,8 @@ static inline uint32_t   CPU_swap_u32(
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/nios2/Makefile.am b/cpukit/score/cpu/nios2/Makefile.am
> index 3d6a35905c..a0ecab3345 100644
> --- a/cpukit/score/cpu/nios2/Makefile.am
> +++ b/cpukit/score/cpu/nios2/Makefile.am
> @@ -5,6 +5,7 @@ CLEANFILES =
>  noinst_LIBRARIES = libscorecpu.a
>
>  libscorecpu_a_SOURCES =
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
>  libscorecpu_a_SOURCES += nios2-context-initialize.c
>  libscorecpu_a_SOURCES += nios2-context-switch.S
> diff --git a/cpukit/score/cpu/nios2/include/rtems/score/cpu.h b/cpukit/score/cpu/nios2/include/rtems/score/cpu.h
> index c7fdb92d01..1d088ed058 100644
> --- a/cpukit/score/cpu/nios2/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/nios2/include/rtems/score/cpu.h
> @@ -353,6 +353,8 @@ static inline uint32_t CPU_swap_u32( uint32_t value )
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/no_cpu/Makefile.am b/cpukit/score/cpu/no_cpu/Makefile.am
> index 556d3dea34..0d89f5af2b 100644
> --- a/cpukit/score/cpu/no_cpu/Makefile.am
> +++ b/cpukit/score/cpu/no_cpu/Makefile.am
> @@ -2,6 +2,7 @@ include $(top_srcdir)/automake/compile.am
>
>  noinst_LIBRARIES = libscorecpu.a
>  libscorecpu_a_SOURCES = cpu.c cpu_asm.c
> +libscorecpu_a_SOURCES += cpucounterfrequency.c
>  libscorecpu_a_SOURCES += cpucounterread.c
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
>
> diff --git a/cpukit/score/cpu/no_cpu/cpucounterfrequency.c b/cpukit/score/cpu/no_cpu/cpucounterfrequency.c
> new file mode 100644
> index 0000000000..bbb8c127fe
> --- /dev/null
> +++ b/cpukit/score/cpu/no_cpu/cpucounterfrequency.c
> @@ -0,0 +1,20 @@
> +/*
> + * Copyright (c) 2018 embedded brains GmbH.  All rights reserved.
> + *
> + *  embedded brains GmbH
> + *  Dornierstr. 4
> + *  82178 Puchheim
> + *  Germany
> + *  <rtems at embedded-brains.de>
> + *
> + * The license and distribution terms for this file may be
> + * found in the file LICENSE in this distribution or at
> + * http://www.rtems.org/license/LICENSE.
> + */
> +
> +#include <rtems/score/cpu.h>
> +
> +uint32_t _CPU_Counter_frequency( void )
> +{
> +  return 1000000000;
> +}
> diff --git a/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h b/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h
> index 5902b4ef36..45edbaa3cf 100644
> --- a/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h
> @@ -1329,6 +1329,13 @@ static inline uint32_t CPU_swap_u32(
>  typedef uint32_t CPU_Counter_ticks;
>
>  /**
> + * @brief Returns the current CPU counter frequency in Hz.
> + *
> + * @return The current CPU counter frequency in Hz.
> + */
> +uint32_t _CPU_Counter_frequency( void );
> +
> +/**
>   * @brief Returns the current CPU counter value.
>   *
>   * A CPU counter is some free-running counter.  It ticks usually with a
> diff --git a/cpukit/score/cpu/or1k/Makefile.am b/cpukit/score/cpu/or1k/Makefile.am
> index ac83acf9b3..732f7c3d69 100644
> --- a/cpukit/score/cpu/or1k/Makefile.am
> +++ b/cpukit/score/cpu/or1k/Makefile.am
> @@ -6,8 +6,9 @@ noinst_LIBRARIES = libscorecpu.a
>
>  libscorecpu_a_SOURCES =
>  libscorecpu_a_SOURCES += cpu.c
> -libscorecpu_a_SOURCES += or1k-context-switch.S
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += or1k-context-initialize.c
> +libscorecpu_a_SOURCES += or1k-context-switch.S
>  libscorecpu_a_SOURCES += or1k-context-validate.S
>  libscorecpu_a_SOURCES += or1k-context-volatile-clobber.S
>  libscorecpu_a_SOURCES += or1k-exception-default.c
> diff --git a/cpukit/score/cpu/or1k/include/rtems/score/cpu.h b/cpukit/score/cpu/or1k/include/rtems/score/cpu.h
> index 648a7a6b9c..1dedeb6629 100644
> --- a/cpukit/score/cpu/or1k/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/or1k/include/rtems/score/cpu.h
> @@ -665,8 +665,6 @@ void _CPU_Context_Initialize(
>  #define CPU_MAXIMUM_PROCESSORS 32
>
>  #ifndef ASM
> -typedef uint32_t CPU_Counter_ticks;
> -
>  typedef struct {
>    uint32_t r[32];
>
> @@ -856,6 +854,8 @@ static inline unsigned int CPU_swap_u32(
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/powerpc/include/rtems/score/cpu.h b/cpukit/score/cpu/powerpc/include/rtems/score/cpu.h
> index 31e74aba95..db2479b210 100644
> --- a/cpukit/score/cpu/powerpc/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/powerpc/include/rtems/score/cpu.h
> @@ -803,6 +803,8 @@ static inline uint32_t CPU_swap_u32(
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  static inline CPU_Counter_ticks _CPU_Counter_read( void )
>  {
>    CPU_Counter_ticks value;
> diff --git a/cpukit/score/cpu/riscv/Makefile.am b/cpukit/score/cpu/riscv/Makefile.am
> index 3630c038a7..e7714686f2 100644
> --- a/cpukit/score/cpu/riscv/Makefile.am
> +++ b/cpukit/score/cpu/riscv/Makefile.am
> @@ -2,6 +2,7 @@ include $(top_srcdir)/automake/compile.am
>  noinst_LIBRARIES = libscorecpu.a
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
>  libscorecpu_a_SOURCES  = cpu.c
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += riscv-exception-handler.S
>  libscorecpu_a_SOURCES += riscv-exception-default.c
>  libscorecpu_a_SOURCES += riscv-exception-frame-print.c
> diff --git a/cpukit/score/cpu/riscv/include/rtems/score/cpu.h b/cpukit/score/cpu/riscv/include/rtems/score/cpu.h
> index 6f286e0bd8..663dd090f2 100644
> --- a/cpukit/score/cpu/riscv/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/riscv/include/rtems/score/cpu.h
> @@ -474,6 +474,8 @@ static inline void _CPU_Context_validate( uintptr_t pattern )
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  #ifdef RTEMS_SMP
> diff --git a/cpukit/score/cpu/sh/Makefile.am b/cpukit/score/cpu/sh/Makefile.am
> index 6a19ce4cb8..37188443ff 100644
> --- a/cpukit/score/cpu/sh/Makefile.am
> +++ b/cpukit/score/cpu/sh/Makefile.am
> @@ -2,6 +2,7 @@ include $(top_srcdir)/automake/compile.am
>
>  noinst_LIBRARIES = libscorecpu.a
>  libscorecpu_a_SOURCES = cpu.c context.c
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
>  libscorecpu_a_SOURCES += sh-exception-frame-print.c
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
> diff --git a/cpukit/score/cpu/sh/include/rtems/score/cpu.h b/cpukit/score/cpu/sh/include/rtems/score/cpu.h
> index aeef5defdd..79453bc1ac 100644
> --- a/cpukit/score/cpu/sh/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/sh/include/rtems/score/cpu.h
> @@ -721,6 +721,8 @@ void _CPU_Exception_frame_print( const CPU_Exception_frame *frame );
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/sparc/include/rtems/score/cpu.h b/cpukit/score/cpu/sparc/include/rtems/score/cpu.h
> index be02dcf9d3..76c8e429e0 100644
> --- a/cpukit/score/cpu/sparc/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/sparc/include/rtems/score/cpu.h
> @@ -1158,6 +1158,8 @@ static inline uint32_t CPU_swap_u32(
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  typedef CPU_Counter_ticks ( *SPARC_Counter_read )( void );
>
>  typedef CPU_Counter_ticks ( *SPARC_Counter_difference )(
> diff --git a/cpukit/score/cpu/sparc64/Makefile.am b/cpukit/score/cpu/sparc64/Makefile.am
> index 6cd23f0c95..711036e41a 100644
> --- a/cpukit/score/cpu/sparc64/Makefile.am
> +++ b/cpukit/score/cpu/sparc64/Makefile.am
> @@ -5,6 +5,7 @@ libscorecpu_a_SOURCES =
>  libscorecpu_a_SOURCES += context.S
>  libscorecpu_a_SOURCES += cpu.c
>  libscorecpu_a_SOURCES += interrupt.S
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
>  libscorecpu_a_SOURCES += sparc64-exception-frame-print.c
>  libscorecpu_a_SOURCES += sparc64-syscall.S
> diff --git a/cpukit/score/cpu/sparc64/include/rtems/score/cpu.h b/cpukit/score/cpu/sparc64/include/rtems/score/cpu.h
> index 9db7cc3134..f1412e0bbb 100644
> --- a/cpukit/score/cpu/sparc64/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/sparc64/include/rtems/score/cpu.h
> @@ -1032,6 +1032,8 @@ static inline uint32_t CPU_swap_u32(
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> diff --git a/cpukit/score/cpu/v850/Makefile.am b/cpukit/score/cpu/v850/Makefile.am
> index 15867801a5..8db039c9f5 100644
> --- a/cpukit/score/cpu/v850/Makefile.am
> +++ b/cpukit/score/cpu/v850/Makefile.am
> @@ -3,6 +3,7 @@ include $(top_srcdir)/automake/compile.am
>  noinst_LIBRARIES = libscorecpu.a
>  libscorecpu_a_SOURCES  = cpu.c
>  libscorecpu_a_SOURCES += cpu_asm.S
> +libscorecpu_a_SOURCES += ../no_cpu/cpucounterfrequency.c
>  libscorecpu_a_SOURCES += ../no_cpu/cpucounterread.c
>  libscorecpu_a_SOURCES += v850-exception-frame-print.c
>  libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS)
> diff --git a/cpukit/score/cpu/v850/include/rtems/score/cpu.h b/cpukit/score/cpu/v850/include/rtems/score/cpu.h
> index 620d228146..5c65f8532f 100644
> --- a/cpukit/score/cpu/v850/include/rtems/score/cpu.h
> +++ b/cpukit/score/cpu/v850/include/rtems/score/cpu.h
> @@ -934,6 +934,8 @@ static inline uint16_t CPU_swap_u16( uint16_t value )
>
>  typedef uint32_t CPU_Counter_ticks;
>
> +uint32_t _CPU_Counter_frequency( void );
> +
>  CPU_Counter_ticks _CPU_Counter_read( void );
>
>  static inline CPU_Counter_ticks _CPU_Counter_difference(
> --
> 2.13.7
>
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