- Offset kernel text one page. Stash the PA of this offset page for
use later.
- Add a few comments.
- Free up some registers earlier in the initialization process.
- Use a `prototc' to set the Translation Control register, rather
than relying on a2 pointing just past the MMU trampoline in the
high page. (Suggested by Charles Hannum.)
- Set VBR to the kernel vector table just before turning on the MMU.
- Just before rebooting, set VBR to 0, which is what the BOOTROM expects
it to be.
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