drivers/timer/apic_timer.c: new local APIC timer for TICKLESS_KERNEL

The existing local APIC timer driver (loapic_timer.c) has bitrotted
and doesn't support TICKLESS_KERNEL, which is the preferred mode of
operation. This patch introduces a completely new driver, called
the APIC timer driver - the name is changed to allow the drivers to
continue to coexist in the short term, and also because "APIC timer"
isn't ambiguous (the I/O APICs do not have timers).

This driver makes no attempt to work with the MVIC timer as the
previous version did, because MVIC support is deprecated.

Signed-off-by: Charles E. Youse <charles.youse@intel.com>
4 files changed