[PAE support] Types + cosmetic fixes

[Jean-Yves Migeon <jeanyves.migeon%free.fr@localhost>]

Hi lists,

Before asking for review of the patch regarding PAE support inside native
i386 kernel (inspired from jmorse@ work from a few weeks ago), I would like
to commit these beforehand ([1] & [2]). I made them separate because they
are not for PAE support "per-see."

They are mostly types + cosmetic fixes. As some of you may now, introducing
PAE affects the x86 paradigm inside NetBSD a bit:
- sizeof paddr_t != sizeof vaddr_t (64 bits for paddr_t, 32 bits for
vaddr_t)
- "unsigned long" cannot be considered as a physical address anymore

This affect a couple of printfs(), printk() and debugging messages, as well
as some variables types used inside x86 pmap [1].

Second small patch [2] contains fixes regarding UVM:
- RLIMIT_RSS which is now set to VM_MAXUSER_ADDRESS (shouldn't it be set to
MIN(VM_MAXUSER_ADDRESS, ptoa(uvmexp.free) instead?),
- ptoa => ctob use (to avoid vaddr_t casts, which might be bad for systems
with total RAM > 4GB)
- a small fix inside AGP heuristics to avoid masking high order bits

Compile tested for ALL, GENERIC, XEN3 kernels for i386, and GENERIC, XEN3*
for amd64.

In case someone wonders, if PAE is added as default option for ALL, more
fixes will be needed in some drivers under sys/dev/ (paddr_t vs unsigned
long issues). Question is: should it be added to ALL for additional checks?

Opinions welcomed.

[1] http://www.netbsd.org/~jym/x86-pae-fixes.diff
[2] http://www.netbsd.org/~jym/mi-pae-fixes.diff

-- 
Jean-Yves Migeon
jeanyves.migeon%free.fr@localhost