coreboot: introduce monotonic timer API

The notion of a monotonic timer is introduced. Along with it
are helper functions and other types for comparing times. This
is just the framework where it is the responsibility of the
chipset/board to provide the implementation of timer_monotonic_get().

The reason structs are used instead of native types is to allow
for future changes to the data structure without chaning all the
call sites.

Change-Id: Ie56b9ab9dedb0da69dea86ef87ca744004eb1ae3
Signed-off-by: Aaron Durbin <>
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <>
2 files changed