On Fri, Apr 25, 2008 at 03:36:53PM +0900, Isaku Yamahata wrote:
> On Fri, Apr 25, 2008 at 11:30:57AM +1000, Simon Horman wrote:
> > Index: xen-unstable.hg/xen/arch/ia64/xen/xenasm.S
> > ===================================================================
> > --- xen-unstable.hg.orig/xen/arch/ia64/xen/xenasm.S 2008-04-25
> > 11:17:22.000000000 +1000
> > +++ xen-unstable.hg/xen/arch/ia64/xen/xenasm.S 2008-04-25
> > 11:18:36.000000000 +1000
> > @@ -195,6 +195,175 @@ GLOBAL_ENTRY(ia64_new_rr7)
> ...
> > +GLOBAL_ENTRY(ia64_new_rr7_efi)
> ...
> > + // re-pin mappings for kernel text and data
> > + mov r24=KERNEL_TR_PAGE_SHIFT<<2
> > + movl r17=KERNEL_START
> > + ;;
> > + ptr.i r17,r24
> > + ;;
> > + ptr.d r17,r24
> > + ;;
> > + srlz.i
> > + ;;
> > + srlz.d
> > + ;;
> > + mov r16=IA64_TR_KERNEL
> > + mov cr.itir=r24
> > + mov cr.ifa=r17
> > + or r18=loc6,r26
> > + ;;
> > + itr.i itr[r16]=r18
> > + ;;
> > + itr.d dtr[r16]=r18
> > + ;;
> > + srlz.i
> > + ;;
> > + srlz.d
> > + ;;
> > +
> > + // re-pin mappings for stack (current)
> > +
> > + // unless overlaps with KERNEL_TR
> > + dep r18=0,r13,0,KERNEL_TR_PAGE_SHIFT
> > + ;;
> > + cmp.eq p7,p0=r17,r18
> > +(p7) br.cond.sptk ia64_new_rr7_efi_stack_overlaps
> > + mov r25=IA64_GRANULE_SHIFT<<2
> > + dep r21=0,r13,60,4 // physical address of "current"
> > + ;;
> > + ptr.d r13,r25
> > + ;;
> > + srlz.d
> > + ;;
> > + or r23=r21,r26 // construct PA | page properties
> > + mov cr.itir=r25
> > + mov cr.ifa=r13 // VA of next task...
> > + mov r21=IA64_TR_CURRENT_STACK
> > + ;;
> > + itr.d dtr[r21]=r23 // wire in new mapping...
> > + ;;
> > + srlz.d
> > + ;;
> > +ia64_new_rr7_efi_stack_overlaps:
>
> Now the text area starts at KERNEL_START = 0xa000000100000000
> which is out of the xen identity mapping area.
> The above overlapping check always fails so that the check
> is unnecessary.
> Please check the current ia64_new_rr7() which was chenged
> rather recently.
Thanks, I missed that change.
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