[Xen-ia64-devel] [patch 11/16] ia64: Add identity mapping of EFI memory to itlb_miss

[Simon Horman <horms@xxxxxxxxxxxx>]

Cc: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Cc: Tristan Gingold <tgingold@xxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>

--- 

Thu, 06 Dec 2007 16:15:27 +0900
* region register index needs to be bit shifted 61 bits to the left
* Use EFI region detection logic similar to other patches

Fri, 25 Jan 2008 13:41:22 +0900
* Check rr7 not rr6, as the rr changes don't really take
  full affect until rr7 is switched - and checking on rr6 doesn't work
  in alt_dtlb_miss

Index: xen-unstable.hg/xen/arch/ia64/xen/ivt.S
===================================================================
--- xen-unstable.hg.orig/xen/arch/ia64/xen/ivt.S        2008-02-05 
16:18:55.000000000 +0900
+++ xen-unstable.hg/xen/arch/ia64/xen/ivt.S     2008-02-05 16:18:55.000000000 
+0900
@@ -121,8 +121,24 @@ ENTRY(itlb_miss)
        /* If address belongs to VMM, go to alt tlb handler */
        cmp.eq p6,p0=0x1e,r17
 (p6)   br.cond.spnt    late_alt_itlb_miss
-       br.cond.sptk fast_tlb_miss_reflect
+       // If it is an EFI address then must have XEN_EFI_RID set
+       // And if that is true, go to alt tlb handler
+       // ((r17 == 0x18 || r17 == 0x1c) && rr7 == XEN_EFI_RID)
+       // Note: rr7 == XEN_EFI_RID implies rr6 == XEN_EFI_RID
+       movl r23=7 << 61
+       ;;
+       cmp.eq p8,p0=0x18,r17           // 0xc...
+       mov r23=rr[r23]
+       ;;
+       cmp.eq.or p8,p0=0x1c,r17        // 0xe...
+       mov r25=XEN_EFI_RID
        ;;
+       cmp.eq.and p8,p0=r25,r23        // rr7 == XEN_EFI_RID
+       ;;
+(p8)   br.cond.spnt late_alt_itlb_miss
+       ;;
+
+       br.cond.spnt fast_tlb_miss_reflect
 END(itlb_miss)
 
        .org ia64_ivt+0x0800

-- 

-- 
Horms


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