:orphan:

.. title:: APIC_TIMER_TSC

.. option:: CONFIG_APIC_TIMER_TSC

*Use invariant TSC for z_timer_cycle_get_32()*

Type: ``bool``

Help
====

If your CPU supports invariant TSC, and you know the ratio of the
TSC frequency to CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC (the local APIC
timer frequency), then enable this for a much faster and more
accurate z_timer_cycle_get_32().

Direct dependencies
===================

(\ :option:`APIC_TIMER <CONFIG_APIC_TIMER>` && \ :option:`SOC_APOLLO_LAKE <CONFIG_SOC_APOLLO_LAKE>`) || (\ :option:`APIC_TIMER <CONFIG_APIC_TIMER>` && \ :option:`SOC_ELKHART_LAKE <CONFIG_SOC_ELKHART_LAKE>`) || \ :option:`APIC_TIMER <CONFIG_APIC_TIMER>`

*(Includes any dependencies from ifs and menus.)*

Defaults
========

- y
- y

Kconfig definitions
===================

.. highlight:: kconfig

At ``soc/x86/apollo_lake/Kconfig.defconfig:29``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:19`` → ``/home/runner/work/bridle/bridle/workspace/build/Kconfig/Kconfig.soc.defconfig:1``

Menu path: (Top)

.. parsed-literal::

    config APIC_TIMER_TSC
    	bool
    	default y
    	depends on \ :option:`APIC_TIMER <CONFIG_APIC_TIMER>` && \ :option:`SOC_APOLLO_LAKE <CONFIG_SOC_APOLLO_LAKE>`

----

At ``soc/x86/elkhart_lake/Kconfig.defconfig:29``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:19`` → ``/home/runner/work/bridle/bridle/workspace/build/Kconfig/Kconfig.soc.defconfig:1``

Menu path: (Top)

.. parsed-literal::

    config APIC_TIMER_TSC
    	bool
    	default y
    	depends on \ :option:`APIC_TIMER <CONFIG_APIC_TIMER>` && \ :option:`SOC_ELKHART_LAKE <CONFIG_SOC_ELKHART_LAKE>`

----

At ``drivers/timer/Kconfig:32``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:32`` → ``drivers/Kconfig:28``

Menu path: (Top) → Device Drivers → Timer Drivers → New local APIC timer

.. parsed-literal::

    config APIC_TIMER_TSC
    	bool "Use invariant TSC for z_timer_cycle_get_32()"
    	depends on \ :option:`APIC_TIMER <CONFIG_APIC_TIMER>`
    	help
    	  If your CPU supports invariant TSC, and you know the ratio of the
    	  TSC frequency to CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC (the local APIC
    	  timer frequency), then enable this for a much faster and more
    	  accurate z_timer_cycle_get_32().

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*