[Xen-changelog] [xen-unstable] [IA64] Clear the key part of cr.itir

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

# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1183662944 21600
# Node ID f71dcdd9cddb96a209e91a905615f1768a9cece1
# Parent  34f285b57b87e94948f9af22df80888452d85dce
[IA64] Clear the key part of cr.itir

Clear the key part of cr.itir before itc.X in alt_dtlb_miss(), alt_itlb_miss()
and frametable_miss().  Preparation for using protection keys.

Signed-off-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>
---
 xen/arch/ia64/xen/ivt.S         |    8 +++++++-
 xen/include/asm-ia64/xenkregs.h |   12 ++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff -r 34f285b57b87 -r f71dcdd9cddb xen/arch/ia64/xen/ivt.S
--- a/xen/arch/ia64/xen/ivt.S   Thu Jul 05 13:04:00 2007 -0600
+++ b/xen/arch/ia64/xen/ivt.S   Thu Jul 05 13:15:44 2007 -0600
@@ -154,14 +154,17 @@ late_alt_itlb_miss:
        movl r17=PAGE_KERNEL
        movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
        ;;
+       mov r20=cr.itir
        extr.u r23=r21,IA64_PSR_CPL0_BIT,2      // extract psr.cpl
        and r19=r19,r16         // clear ed, reserved bits, and PTE ctrl bits
        extr.u r18=r16,XEN_VIRT_UC_BIT,1        // extract UC bit
        ;;
        cmp.ne p8,p0=r0,r23     // psr.cpl != 0?
        or r19=r17,r19          // insert PTE control bits into r19
+       dep r20=0,r20,IA64_ITIR_KEY,IA64_ITIR_KEY_LEN   // clear the key 
        ;;
        dep r19=r18,r19,4,1     // set bit 4 (uncached) if access to UC area.
+       mov cr.itir=r20         // set itir with cleared key
 (p8)   br.cond.spnt page_fault
        ;;
        itc.i r19               // insert the TLB entry
@@ -195,6 +198,7 @@ late_alt_dtlb_miss:
 (p9)   cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22  // check isr.code field
 (p8)   br.cond.spnt page_fault
        ;;
+       mov r20=cr.itir
 #ifdef CONFIG_VIRTUAL_FRAME_TABLE
        shr r22=r16,56          // Test for the address of virtual frame_table
        ;;
@@ -204,11 +208,13 @@ late_alt_dtlb_miss:
        // If it is not a Xen address, handle it via page_fault.
        extr.u r22=r16,59,5
        ;;
+       dep r20=0,r20,IA64_ITIR_KEY,IA64_ITIR_KEY_LEN   // clear the key
        cmp.ne p8,p0=0x1e,r22
 (p8)   br.cond.sptk page_fault
        ;;
        dep r21=-1,r21,IA64_PSR_ED_BIT,1
        or r19=r19,r17          // insert PTE control bits into r19
+       mov cr.itir=r20         // set itir with cleared key
        ;;
        dep r19=r18,r19,4,1     // set bit 4 (uncached) if access to UC area
 (p6)   mov cr.ipsr=r21
@@ -242,7 +248,7 @@ GLOBAL_ENTRY(frametable_miss)
        shladd r24=r19,3,r24    // r24=&pte[pte_offset(addr)]
        ;;
 (p7)   ld8 r24=[r24]           // r24=pte[pte_offset(addr)]
-       mov r25=0x700|(PAGE_SHIFT<<2) // key=7
+       mov r25=(PAGE_SHIFT<<IA64_ITIR_PS)
 (p6)   br.spnt.few frametable_fault
        ;;
        mov cr.itir=r25
diff -r 34f285b57b87 -r f71dcdd9cddb xen/include/asm-ia64/xenkregs.h
--- a/xen/include/asm-ia64/xenkregs.h   Thu Jul 05 13:04:00 2007 -0600
+++ b/xen/include/asm-ia64/xenkregs.h   Thu Jul 05 13:15:44 2007 -0600
@@ -35,4 +35,16 @@
 #define IA64_PTA_VF     (__IA64_UL(1) << IA64_PTA_VF_BIT)
 #define IA64_PTA_BASE   (__IA64_UL(0) - ((__IA64_UL(1) << IA64_PTA_BASE_BIT)))
 
+/* Some cr.itir declarations. */
+#define        IA64_ITIR_PS            2
+#define        IA64_ITIR_PS_LEN        6
+#define IA64_ITIR_PS_MASK      (((__IA64_UL(1) << IA64_ITIR_PS_LEN) - 1) \
+                                                       << IA64_ITIR_PS)
+#define        IA64_ITIR_KEY           8
+#define        IA64_ITIR_KEY_LEN       24
+#define        IA64_ITIR_KEY_MASK      (((__IA64_UL(1) << IA64_ITIR_KEY_LEN) - 
1) \
+                                                       << IA64_ITIR_KEY)
+#define IA64_ITIR_PS_KEY(_ps, _key)    (((_ps) << IA64_ITIR_PS) | \
+                                       (((_key) << IA64_ITIR_KEY)))
+
 #endif /* _ASM_IA64_XENKREGS_H */

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog