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bsps/x86_64: Add APIC timer based clock driver

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The APIC timer is calibrated by running the i8254 PIT for a fraction of a
second (determined by PIT_CALIBRATE_DIVIDER) and counting how many times the
APIC counter has ticked. The calibration can be run multiple times (determined
by APIC_TIMER_NUM_CALIBRATIONS) and averaged out.

Updates #2898.
This commit is contained in:
Amaan Cheval
2018-08-13 16:25:34 +05:30
committed by Joel Sherrill
parent 686932125d
commit bc7313134f
8 changed files with 640 additions and 1 deletions
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4
c/src/lib/libbsp/x86_64/amd64/Makefile.am
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@@ -27,11 +27,13 @@ librtemsbsp_a_SOURCES += ../../../../../../bsps/x86_64/amd64/start/page.c
librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/sbrk.c
librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/getentropy/getentropy-cpucounter.c
librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspreset-empty.c
# interrupts
librtemsbsp_a_SOURCES += ../../../../../../bsps/x86_64/amd64/interrupts/pic.c
librtemsbsp_a_SOURCES += ../../../../../../bsps/x86_64/amd64/interrupts/idt.c
librtemsbsp_a_SOURCES += ../../../../../../bsps/x86_64/amd64/interrupts/isr_handler.S
librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/irq/irq-default-handler.c
# clock
librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/clock/clock-simidle.c
librtemsbsp_a_SOURCES += ../../../../../../bsps/x86_64/amd64/clock/clock.c
# console
librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/serial/console-termios-init.c
librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/dev/serial/console-termios.c