设定;global;variable:
avail_start 可用而未用的;physcial;mem;(physfree).
virtual_avail
virtual_end
kernel_pmap
并保留;virtual;space;给;pmap;使用;(不;allocate;physical;addr),
CMAP1/CADDR1,;CMAP2/CADDR2 for;zeroing;&;copying;pages.
ptmmap/ptvmmap for;reading;arbitrary;physical;pages
via;/dev/mem.
msgbufmap/msgbufp to;map;the;system;message;buffer.
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