RE: [Xen-ia64-devel]Question about priv_ptc_e

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

> >There are several of these that need to be changed,
> >so let's change all of them the same way at the same time.
> 
> It is still being used.
> At least, Dom0 uses pte.e to emulate fc.
> GLOBAL_ENTRY(xen_fc)
>     261     movl r8=running_on_xen;;
>     262     ld4 r8=[r8];;
>     263     cmp.eq p7,p0=r8,r0;;
>     264 (p7)    fc r32;;
>     265 (p7)    br.ret.sptk.many rp
>     266     ;;
>     267     ptc.e r96       // this is a "privified" fc r32
>     268     ;;
>     269     br.ret.sptk.many rp
>     270 END(xen_fc)

Good catch.  In fact, there are uses of this for several
instructions still in xenlinux/ia64.  Grep -sparse
for "privif" to see all(?) of them.  I think these never
got translated to HYPERPRIVOPs because there was no
performance need.  But they should be fixed to avoid
the possibility of a bug.



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