remove unneeded vmparam.h include from pte.h
include vmparam.h in process_machdep for USER_SPACE_BITS

T-Head implemented a page attribute extension that violates the RISC-V
specification. The default attributes result in memory being uncached
which makes the system perform like a slug. So implement

T-Head implemented a page attribute extension that violates the RISC-V
specification. The default attributes result in memory being uncached
which makes the system perform like a slug. So implement a workaround
that is designed to make implementation of the Svpbmt extension that is
part of the latest published RISC-V specification. This gets us a bit
further booting OpenBSD on an Allwinner D1 SoC.

ok mlarkin@, jca@

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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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