Mitchell Horne bfe918fa0e Add support for HSM SBI extension
The Hardware State Management (HSM) extension provides a set of SBI
calls that allow the supervisor software to start and stop hart
execution.

The HSM extension has been implemented in OpenSBI and is present in
the v0.7 release.

[1] https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.adoc

Reviewed by:	br
Differential Revision:	https://reviews.freebsd.org/D24496
2020-05-01 21:55:51 +00:00
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