[patch] x86_*fence replaced by membar_ops(3)

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

Hi lists,

These are the first steps to have MI Xen drivers (hi christoph!), by 
replacing all the x86_*fence memory ops to their "equivalent" ones from 
the membar_ops(3) API. See [1].

I took this opportunity to do the same for arch/x86,i386,amd64.

GENERIC/XEN3_DOM0 do compile fine for amd64, and GENERIC/XEN3_DOM0 were 
compiled and "tested" (through a complete build.sh run) for i386.

@port-xen: what is the purpose of this load fence [2], considering that 
hypercalls are memory barriers?

Thanks for reading. Comments and reviews are appreciated.

Cheers,

[1] http://www.netbsd.org/~jym/membar_ops.diff

[2] http://www.netbsd.org/~jym/if_xennet_xenbus.c.diff

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