libkvm: support powerpc64 radix minidumpsHEADmain

PowerPC64 radix minidumps use a 64KB root directory followed by three
levels of 4KB page tables.  Add an MMU backend which walks those tables,
handles large-page leaves, and decodes their always-big-endian entries
on both powerpc64 and powerpc64le.

Reject old radix minidumps whose pmap section is empty with a specific
diagnostic.  Add a synthetic powerpc64le dump test which reads a page
through both its kernel and direct-map addresses.

PR:		298532
Reviewed by:	jhb
Approved by:	jhb (mentor)
MFC after:	2 weeks
Sponsored by:	FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D59743

0 files changed, 0 insertions, 0 deletions