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de-bloat the proc structure by allocating notes
with on the heap instead of embedding them in
the proc structure.
This saves around 640 bytes per process.
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Handlin notes is common for all architectures
except how the note has to be pushed on the user
stack.
This change adds a popnote() function that returns
only the note string or nil if the process should
not be notified (no notes or user notes hold off).
Popnote() also handles common errors like notify
during note handling or missing note handler and
will suicide the process in that case.
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The kernel stack is now above the Proc structure,
so the explicit kstack pointer can be eliminated.
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This is a work in progress port to the mntreform2 laptop.
Working so far:
- mmu (same as raspberry pi 3b+)
- arm generic timer
- gicv3
- uart1
- enet
With access to the uart, one can netboot this kernel in u-boot
using the following commands:
> dhcp
> bootm
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