Konstantin Belousov e2e80fb3de vm_map: Add a map entry kind that can only be clipped at specific boundary.
The entries and their clip boundaries must be aligned on supported
superpages sizes from pagesizes[].  vm_map operations return Mach
error KERN_INVALID_ARGUMENT, which is usually translated to EINVAL, if
it would require clip not at the boundary.

In other words, entries force preserving virtual addresses superpage
properties.

Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D24652
2020-09-09 22:02:30 +00:00
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