[Bug 194974] Limit /dev/mem access to addresses in phys_avail[] - i.e. actual memory

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194974

Alan Cox <alc at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |alc at FreeBSD.org

--- Comment #2 from Alan Cox <alc at FreeBSD.org> ---
Use dump_avail[] rather than phys_avail[].  Between the time that we first
initialize phys_avail[] and finally execute vm_page_startup(), we remove pages
from phys_avail[] for various purposes.  Also, dump_avail[] includes pages
containing the kernel code and data that are excluded from phys_avail[].  In
summary, dump_avail[] more accurately describes the physical memory of the
machine.

See the arm version of this code.  It already implements the check against
dump_avail[].

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