Mitchell Horne
27595bea69
Extend pmap_bootstrap_dmap() to build the DMAP with 4K-page granularity.
Recently we have been approximating it with 2MB mappings. The motivation
again is the problematic FU540 hardware, which seems to require more
accurate mappings still to avoid triggering its PMP errata.
Although this hardware alone is of little consequence, constructing the
DMAP accurately/correctly may help avoid future surprises.
The implementation contains some repetitive code. This could be
expressed differently, but my guiding principle for these early routines
is that being simple and explicit about what we are doing makes them
easier to comprehend.
See also 762a3224cd ("riscv: smarter DMAP construction).
Tested by: Klaus Küchemann <maciphone2@googlemail.com>
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D54716
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