Jeff Epler 7f744a2369 Supervisor: move most of systick to the supervisor
This code is shared by most parts, except where not all the #ifdefs
inside the tick function were present in all ports.  This mostly would
have broken gamepad tick support on non-samd ports.

The "ms32" and "ms64" variants of the tick functions are introduced
because there is no 64-bit atomic read.  Disabling interrupts avoids
a low probability bug where milliseconds could be off by ~49.5 days
once every ~49.5 days (2^32 ms).

Avoiding disabling interrupts when only the low 32 bits are needed is a minor

Testing performed: on metro m4 express, USB still works and
time.monotonic_ns() still counts up
2019-11-18 11:01:23 -06:00
bus drivers/bus: Pull out software SPI implementation to dedicated driver. 2018-03-10 00:59:43 +11:00
wiznet5k Supervisor: move most of systick to the supervisor 2019-11-18 11:01:23 -06:00