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Don't involve the pmap module directly, as there could be others. Make
the cpu module completely responsible for synchronizing all processors
on kernel entry so that interrupts can be explicitely enabled there.
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In practice, this merely means an idle thread now exists for each CPU,
and threads can be preempted and rescheduled on each of them. There is
currently no migration between processors.
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This change adds periodic timer interrupt reporting to the thread
module, basic thread selection, and context switching. It currently
only applies to the main processor. The x86/tcb module has been
drastically simplified as a side effect.
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Three new modules are added :
- kern/task: Tasks are thread groups and resource containers for their
threads.
- kern/thread: The well known scheduling unit.
- x86/tcb: The architecture specific thread control block.
The kernel currently loads a single thread context on the main processor.
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