Include "opt_param.h" (ifdef _KERNEL_OPT) everywhere that MSGBUFSIZE is
referenced since some sources include <machine/param.h>.

Poor sun2 has only 14MB KVA space so reduce NKMEMPAGES_MIN_DEFAULT and
NKMEMPAGES_MAX_DEFAULT values accordingly.

XXX: netbsd-6 GENERIC still gets "panic: pool_get: kmem-4096: page empty"

proper sizing of kmem_arena on different ports

PR port-i386/45946: Kernel locks up in VMEM system

Remove clause 3 (UCB advertising clause) from the University of Utah
copyright. Confirmed by Mike Hibler, mike at cs.utah.edu - thanks!
Also, merge UCB and Utah copyright texts back into one, as the

Remove clause 3 (UCB advertising clause) from the University of Utah
copyright. Confirmed by Mike Hibler, mike at cs.utah.edu - thanks!
Also, merge UCB and Utah copyright texts back into one, as they
originally were.

Extra verification by snj@.

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Remove separate mb_map. The nmbclusters is computed at boot time based
on the amount of physical memory and limited by NMBCLUSTERS if present.
Architectures without direct mapping also limit it based

Remove separate mb_map. The nmbclusters is computed at boot time based
on the amount of physical memory and limited by NMBCLUSTERS if present.
Architectures without direct mapping also limit it based on the kmem_map
size, which is used as backing store. On i386 and ARM, the maximum KVA
used for mbuf clusters is limited to 64MB by default.

The old default limits and limits based on GATEWAY have been removed.
key_registered_sb_max is hard-wired to a value derived from 2048
clusters.

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Refactoring MD segment related definitions on m68k ports:
- move macro SEGSHIFT, NBSG, and SEGOFFSET from <machine/param.h>
to <machine/pmap.h> where they should belong
- don't use m68k_round_seg()

Refactoring MD segment related definitions on m68k ports:
- move macro SEGSHIFT, NBSG, and SEGOFFSET from <machine/param.h>
to <machine/pmap.h> where they should belong
- don't use m68k_round_seg() and m68k_trunc_seg() in sun2 pmap sources
and instead define and use sun2_round_seg() and sun2_trunc_seg()
since they are quite pmap implementation dependent

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Replce exec_map with a pool. Proposed on tech-kern@, reviewed by chs@.

Bump MAXBSIZE to 0x4000 because 16KB could be used by default
on newfs(8) in these days and we'll get "buf mem pool index 5" panic
in sys/kern/vfs_bio.c.

merge ktrace-lwp.

move spl*() and IPL_* definitions from psl.h to intr.h.

de-__P, remove register, ansify, b* -> mem*, u_int*_t -> uint*_t.

Set MAXPHYS to 0xe000.
XXX This really is the wrong way to do this.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

Now always define PGSHIFT. Thanks to the ELF move, note the new
larger msgbuf size and different KERNBASE.

Define a very small UBC_NWINS to keep UBC from eating all kernel VM.

Added.