DragonFlyBSD

Here's a patch for Page Attribute Table support I ported from FreeBSD
quite a while back. I'm sending it to submit@ in case someone will get
interested and deal w/ the cpu identification part (probably integrating
the FreeBSD code for that too) so we can integrate it. It will get used
more and more in new code and will significantly help porting.

As you'll notice in pmap_init_pat()

#ifdef notyet
if (cpu_vendor_id != CPU_VENDOR_INTEL ||
+ (I386_CPU_FAMILY(cpu_id) == 6 && I386_CPU_MODEL(cpu_id) >=
0xe)) {
#else
if (!0) {
+#endif

so we need at least I386_CPU_{FAMILY,MODEL} (to be found in
i386/include/specialreg.h) and having the companion code would be nice
too (ISTR it was straightforward but not trivial, not sure if I remember
correctly now. Looks trivial enough :/)

I have tried using the PMAP in mxge(4) so I don't think you'll get any
panics ;)

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