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riscv: improve commentary around initial stvec

Description

riscv: improve commentary around initial stvec

Make it explicit why we must set the trap vector before enabling virtual
memory.

Reviewed by: br, jhb, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D45474

Details

Provenance
mhorneAuthored on Jun 3 2024, 5:24 PM
Reviewer
br
Differential Revision
D45474: riscv: improve commentary around initial stvec
Parents
rG3ff981587ff8: riscv: Don't handle missing kernel L3 pages
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