[Xen-changelog] [xen-unstable] [IA64] Fix ia64_reload_tr in mca_asm.S

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1200596743 25200
# Node ID e8d933b33f4bc99dbd0c99cb94650a2be58bdb7a
# Parent  fd56e24b07c8f2435ea2875c7fd60932bcc5bc46
[IA64] Fix ia64_reload_tr in mca_asm.S

- DTR for stack comparison should be done with xen heap.
- cpu_kr current offset contains (physicall address >> IA64_GRANULE_SHIFT)
  so the comparison was done with the wrong value.
- When mapping VHPT area, overlapping should be avoided.

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 xen/arch/ia64/linux-xen/mca_asm.S |   40 ++++++++++++++++++++++++++++++++++----
 1 files changed, 36 insertions(+), 4 deletions(-)

diff -r fd56e24b07c8 -r e8d933b33f4b xen/arch/ia64/linux-xen/mca_asm.S
--- a/xen/arch/ia64/linux-xen/mca_asm.S Thu Jan 17 12:05:43 2008 -0700
+++ b/xen/arch/ia64/linux-xen/mca_asm.S Thu Jan 17 12:05:43 2008 -0700
@@ -479,14 +479,26 @@ ia64_reload_tr:
        ;;
        // 4. Reload DTR for stack.
 #ifdef XEN
-       // avoid overlapping with kernel TR
-       movl r17=KERNEL_START
+       // avoid overlapping with xenheap TR
+       mov r17=ip
+       ;;
+       tpa r17=r17
+       ;;
+       dep r17=0,r17,0,KERNEL_TR_PAGE_SHIFT
+       ;;
+       shr.u r17=r17,IA64_GRANULE_SHIFT
+       ;; 
        GET_THIS_PADDR(r2,cpu_kr);;
        add r2=IA64_KR_CURRENT_OFFSET,r2;;
        ld8 r16=[r2];;
        ;;
-       dep  r16=0,r16,0,KERNEL_TR_PAGE_SHIFT
-       ;;
+#if KERNEL_TR_PAGE_SHIFT < IA64_GRANULE_SHIFT
+# error "KERNEL_TR_PAGE_SHIFT < IA64_GRANULE_SHIFT shouldn't happen"
+#endif
+#if KERNEL_TR_PAGE_SHIFT > IA64_GRANULE_SHIFT
+       dep  r16=0,r16,0,KERNEL_TR_PAGE_SHIFT-IA64_GRANULE_SHIFT
+       ;;
+#endif
        cmp.eq p7,p0=r17,r16
 (p7)   br.cond.sptk    .reload_vhpt
        
@@ -522,6 +534,25 @@ ia64_reload_tr:
        // 5. VHPT
 #if VHPT_ENABLED
        GET_VA_VCPU_VHPT_MADDR(r2,r3);;
+       dep r3=0,r2,0,KERNEL_TR_PAGE_SHIFT
+       ;;
+       shr.u r3=r3,IA64_GRANULE_SHIFT
+       ;;
+       cmp.eq p7,p0=r3,r17
+(p7)   br.cond.sptk    .overlap_vhpt
+       ;;
+
+       // avoid overlapping with stack TR
+       shr.u r17=r2,IA64_GRANULE_SHIFT
+       GET_THIS_PADDR(r3, cpu_kr);;
+       add r3=IA64_KR_CURRENT_STACK_OFFSET,r3
+       ;;
+       ld8 r3=[r3]
+       ;;
+       cmp.eq p7,p0=r3,r17
+(p7)   br.cond.sptk    .overlap_vhpt
+       ;;
+
        dep r16=0,r2,0,IA64_GRANULE_SHIFT
        movl r20=PAGE_KERNEL
        ;;
@@ -538,6 +569,7 @@ ia64_reload_tr:
        ;;
        srlz.d
        ;;
+.overlap_vhpt:
 #endif
 #endif
        br.sptk.many done_tlb_purge_and_reload

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