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/freebsd-9.3-release/sys/i386/xen/
H A Dpmap.cdiff 230431 Sat Jan 21 16:20:50 MST 2012 alc MFC r228746
The Xen pmap doesn't support superpages. So, there is no point in it
initializing structures, like the pv table, that are only used to
implement superpages. In fact, some of the unnecessary code in
pmap_init() was actually doing harm. It was preventing the kernel from
booting on virtual machines with more than 768 MB of memory.

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