Cleanup early bootstrap code. This mostly realigns the code with the
FreeBSD code from which it was derived. In particular, it uses the same
trick to switch page tables as FreeBSD, which is what we

Cleanup early bootstrap code. This mostly realigns the code with the
FreeBSD code from which it was derived. In particular, it uses the same
trick to switch page tables as FreeBSD, which is what we use to spin up
the secondary CPUs already. This avoids having to install a temporary
1:1 mapping.

ok mlarkin@

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add OpenBSD rcs ids

Initial import of OpenBSD/riscv64

This work is based on the effort:
https://www.openbsd.org/papers/Porting_OpenBSD_to_RISCV_FinalReport.pdf
"Porting OpenBSD to RISC-V ISA"
by
Brian Bamsch <bbamsch@g

Initial import of OpenBSD/riscv64

This work is based on the effort:
https://www.openbsd.org/papers/Porting_OpenBSD_to_RISCV_FinalReport.pdf
"Porting OpenBSD to RISC-V ISA"
by
Brian Bamsch <bbamsch@google.com>
Wenyan He <wenyan.he@sjsu.edu>
Mars Li <mengshi.li.mars@gmail.com>
Shivam Waghela <shivamwaghela@gmail.com>

With additional work by Dale Rahn <drahn@openbsd.org>

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