Don't export USER_SR if _MODULE is defined.
Add a common <powerpc/vmparam.h> like we have for <powerpc/pmap.h>

Implement partial support for the RS6K PCI Bridge found on 7025-F40
models. This code was made possible by assistance from Cory Bajus.

Add code that asks the PCI bridge what it's config base addres

Implement partial support for the RS6K PCI Bridge found on 7025-F40
models. This code was made possible by assistance from Cory Bajus.

Add code that asks the PCI bridge what it's config base address is, and
use that when wiring up an indirect bridge type.
Move prep's user segment register to 10, because the 7025's PCI config
address is at 11, where the user segment used to be.
Add a battable entry for 0xbf800000 for machines with RS6K bridges.

There is still probably work left to be done before a 7025-F40 is fully
supported.

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Rename PPC_MPC6XX to PPC_OEA (and any mpc6xx reference to oea).

Remove OLDPMAP support.

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.

Use 11 for the USER_SR since we use BAT 12 for PCI MEM space.

switch all mpc6xx powerpc ports to NEWPMAP by default.
the old pmap is still available with the OLDPMAP option.

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

NEWPMAP

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 mandator

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.

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Define VM_MAX_KERNEL_BUF and PAGER_MAP_SIZE (from macppc)
so that the kernel can boot with 128MB memory.

XXX: How can we determine size of the buffer cache on UBC?

Bump default data size to 32 MB.

Initial import prep port.