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Add a local context structure to the SMP lock API for acquire and
release pairs. This context can be used to store the ISR level and
profiling information. It may be later used to enable more
sophisticated lock algorithms, e.g. MCS locks.
There is only one lock that cannot be used with a local context. This
is the per-CPU lock since here we would have to transfer the local
context through a context switch which is very complicated.
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Two issues are addressed.
1. On single processor configurations the set/get of the now/uptime
timestamps is now consistently protected by ISR disable/enable
sequences. Previously nested interrupts could observe partially written
values since 64-bit writes are not atomic on 32-bit architectures in
general. This could lead to non-monotonic uptime timestamps.
2. The TOD now/uptime maintanence is now independent of the giant lock.
This is the first step to remove the giant lock in _Thread_Dispatch().
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Move the nanoseconds since last tick support from the Watchdog to the
TOD handler. Now the TOD managment is encapsulated in the TOD_Control
structure.
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