vmspace changes to use sysref

[walt]

On Tue, 1 May 2007, Matthew Dillon wrote:

>      Could you print out your mptable?  run 'mptable'.  Even though its
>      a single-cpu machine there might be an IOAPIC....

# mptable -verbose -grope

===============================================================================

MPTable, version 2.0.15

 looking for EBDA pointer @ 0x040e, found, searching EBDA @ 0x0009fc00
 searching CMOS 'top of mem' @ 0x0009f800 (638K)
 searching default 'top of mem' @ 0x0009fc00 (639K)
 searching BIOS @ 0x000f0000
 searching extended BIOS @ 0x000e0000
 groping memory @ 0x00080000
 groping memory @ 0x00090000

 MP FPS NOT found,
 suggest trying -grope option!!!

I'll try your patch later today.