Bump DFLSSIZ from 512KB to 2MB on all hp300 pmap m68k ports.

Some modern applications could require 512KB buffer on stack and
no particular comment on port-m68k@:
https://mail-index.netbsd.org/port-m68k/2025/02/02/msg000893.html

branches: 1.23.30;
Add MAX/MIN PAGE_SIZE and PAGE_SHIFT definitions of m68k for jemalloc(3).

Background:
- All m68k ports have fixed PAGE_SIZE value in their kernels,
but each port uses different PAGE_SIZE value (4096 or 8192)
due to historical reasons.
- Currently module(7) binaries are built per each port so
all m68k kernel sources don't support run-time variable PAGE_SIZE.
- MI <uvm/uvm_param.h> assumes that the port supports a variable
PAGE_SIZE on module(7) builds if both MAX_PAGE_SIZE and MIN_PAGE_SIZE
are defined and they have different values.
- On the other hand, jemalloc(3) checks MAX_PAGE_SHIFT in
src/external/bsd/jemalloc/include/jemalloc/internal/jemalloc_internal_defs.h
for internal optimization.
- m68k ports share userland binaries (especially pkgsrc binaries)
among all ports, so we need to define MAX_PAGE_SHIFT as 13 to
support m68k ports where PAGE_SIZE==8192.
(though this would affect only if static binaries built on
4k page hosts are executed on 8k page hosts)

To solve these inconsistency on PAGE_SIZE definitions,
we should have an independent PAGE_SIZE related definitions
for userland, but it requires major reorganization.
For now (especially for netbsd-9) we define MAX/MIN PAGE_SIZE and
PAGE_SHIFT values in <m68k/vmparam.h> only in !defined(_KERNEL) case.

Discussed on source-changes-d@ and tech-kern@ with christos@ and thorpej@:
https://mail-index.netbsd.org/source-changes-d/2020/01/thread1.html#012035
https://mail-index.netbsd.org/tech-kern/2020/01/thread1.html#025954

Should be pulled up to netbsd-9.

branches: 1.22.2; 1.22.4;
Fix lingering page size comments.

Pointed out by christos@ on port-m68k@:
http://mail-index.netbsd.org/port-m68k/2019/06/06/msg000726.html

XXX: we also need MAX_PAGE_SIZE in somewhere for newer jemalloc?

branches: 1.21.14;
PR port-mac68k/51923
Bump default MAXTSIZ to 32MB for m68k ports, which allos us to use GCC 5.4 on
GENERIC kernels.
Ok jklos

PR port-mac68k/51923
Remove unused SYSPTSIZE and USRPTSIZE from m68k ports.
Ok jklos

branches: 1.19.8; 1.19.26; 1.19.30; 1.19.34;
Add preliminary PROM internal function based framebuffer console support,
which was demonstrated at Open Source Conference 2011 Kansai @ Kyoto
back in July:
http://www.NetBSD.org/gallery/events.html#opensourceconf2011-Kansai

- map 0xc0000000-0xffffffff PA region (which is mirror of PA 0x0-0x3fffffff)
to the same VA via %tt0 and %tt1 registers and move KVA space accordingly
(like luna68k does for its devices)
- save trap #0 vector for PROM function calls in early bootstrap
and register it to trap #14 to call it from kernel for console output
- add dumb romcall based tty attachment taken from src/sys/dev/ofw/ofcons.c
- add rom function call stubs from news68k/stand/common/romcalls.S
- remove IIOV() macro for device registers where now mapped PA==VA via %tt1

XXX: romcons is not enabled yet because there is no generic interface
XXX: to attach wskbd(4) to non wsdisplay(4) devices like this romcons.

branches: 1.18.4;
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@.

branches: 1.17.2; 1.17.4;
Remove incomplete, never worked dynamic run-time memory registration
(uvm_page_physload(9)). This functionality will be re-added later.

branches: 1.16.2; 1.16.4;
Use PGSHIFT from <machine/param.h> for PAGE_SHIFT.
We can assume PGSHIFT is always constant on current
m68k pmap_motorola implementation.
Also fix some leftover HP300 comments on some ports.

Minor tweak to the pv_table management in the Hibler-derived m68k pmaps:
The head of the list is now a pv_header, which contains the first pv_entry
as well as a 16-bit attributes field (replaces the pmap_attributes array
plus the pv_entry::pv_flags field) as a 16-bit count of caller-specified
cache-inhibited mappings.

Tested on hp300 (shared pmap_motorola.c), changes to atari and amiga copies
are purely mechanical.

Remove SHMMAXPGS from all kernel configs. Dynamically compute the
initial limit as 1/4 of the physical memory. Ensure the limit is at
least 1024 pages, the old default on most platforms.

branches: 1.13.78; 1.13.86; 1.13.92;
merge ktrace-lwp.

merge yamt-km branch.
- don't use managed mappings/backing objects for wired memory allocations.
save some resources like pv_entry. also fix (most of) PR/27030.
- simplify kernel memory management API.
- simplify pmap bootstrap of some ports.
- some related cleanups.

branches: 1.11.8; 1.11.10;
Move UCB-licensed code from 4-clause to 3-clause licence.

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

branches: 1.10.2;
Use PAGE_SIZE rather than NBPG.

Use __LDPGSZ (which must be == USRTEXT) as the text address for a.out
executables, and eliminate the USRTEXT constant, which was only used
by the a.out exec code.

MAXSLP is defined to be a machine-independent scheduling parameter,
so move it into sys/param.h.

branches: 1.7.2; 1.7.8;
Per discussion w/ chuck and chuck, restructure the md page stuff
to use a structure called "vm_page_md", and use __HAVE_VM_PAGE_MD
and __HAVE_PMAP_PHYSSEG.

Add a VM_MDPAGE_MEMBERS macro that defines pmap-specific data for
each vm_page structure. Add a VM_MDPAGE_INIT() macro to init this
data when pages are initialized by UVM. These macros are mandatory,
but ports may #define them to nothing if they are not needed/used.

This deprecates struct pmap_physseg. As a transitional measure,
allow a port to #define PMAP_PHYSSEG so that it can continue to
use it until its pmap is converted to use VM_MDPAGE_MEMBERS.

Use all this stuff to eliminate a lot of extra work in the Alpha
pmap module (it's smaller and faster now). Changes to other pmap
modules will follow.

branches: 1.5.2;
Remove unused pcbb() macro.

branches: 1.4.2;
We use 4K pages on the news68k. Make PAGE_SIZE and friends into
compile-time constants.

Update for the NKMEMPAGES changes.

Remove obsoleted macros.

branches: 1.1.2;
Initial import of news68k port.