[IA64] 4-level page tables
[linux-2.6.git] / arch / ia64 / kernel / ivt.S
index c13ca0d49c4a04be59c32e2317149264fda092fa..e06f21f60dc552e4f4bfba4fdc2abb0ab969576d 100644 (file)
@@ -114,7 +114,7 @@ ENTRY(vhpt_miss)
        shl r21=r16,3                           // shift bit 60 into sign bit
        shr.u r17=r16,61                        // get the region number into r17
        ;;
-       shr r22=r21,3
+       shr.u r22=r21,3
 #ifdef CONFIG_HUGETLB_PAGE
        extr.u r26=r25,2,6
        ;;
@@ -140,20 +140,34 @@ ENTRY(vhpt_miss)
 (p6)   dep r17=r18,r19,3,(PAGE_SHIFT-3)        // r17=PTA + IFA(33,42)*8
 (p7)   dep r17=r18,r17,3,(PAGE_SHIFT-6)        // r17=PTA + (((IFA(61,63) << 7) | IFA(33,39))*8)
        cmp.eq p7,p6=0,r21                      // unused address bits all zeroes?
-       shr.u r18=r22,PMD_SHIFT                 // shift L2 index into position
+#ifdef CONFIG_PGTABLE_4
+       shr.u r28=r22,PUD_SHIFT                 // shift L2 index into position
+#else
+       shr.u r18=r22,PMD_SHIFT                 // shift L3 index into position
+#endif
        ;;
        ld8 r17=[r17]                           // fetch the L1 entry (may be 0)
        ;;
 (p7)   cmp.eq p6,p7=r17,r0                     // was L1 entry NULL?
-       dep r17=r18,r17,3,(PAGE_SHIFT-3)        // compute address of L2 page table entry
+#ifdef CONFIG_PGTABLE_4
+       dep r28=r28,r17,3,(PAGE_SHIFT-3)        // compute address of L2 page table entry
+       ;;
+       shr.u r18=r22,PMD_SHIFT                 // shift L3 index into position
+(p7)   ld8 r29=[r28]                           // fetch the L2 entry (may be 0)
        ;;
-(p7)   ld8 r20=[r17]                           // fetch the L2 entry (may be 0)
-       shr.u r19=r22,PAGE_SHIFT                // shift L3 index into position
+(p7)   cmp.eq.or.andcm p6,p7=r29,r0            // was L2 entry NULL?
+       dep r17=r18,r29,3,(PAGE_SHIFT-3)        // compute address of L3 page table entry
+#else
+       dep r17=r18,r17,3,(PAGE_SHIFT-3)        // compute address of L3 page table entry
+#endif
        ;;
-(p7)   cmp.eq.or.andcm p6,p7=r20,r0            // was L2 entry NULL?
-       dep r21=r19,r20,3,(PAGE_SHIFT-3)        // compute address of L3 page table entry
+(p7)   ld8 r20=[r17]                           // fetch the L3 entry (may be 0)
+       shr.u r19=r22,PAGE_SHIFT                // shift L4 index into position
        ;;
-(p7)   ld8 r18=[r21]                           // read the L3 PTE
+(p7)   cmp.eq.or.andcm p6,p7=r20,r0            // was L3 entry NULL?
+       dep r21=r19,r20,3,(PAGE_SHIFT-3)        // compute address of L4 page table entry
+       ;;
+(p7)   ld8 r18=[r21]                           // read the L4 PTE
        mov r19=cr.isr                          // cr.isr bit 0 tells us if this is an insn miss
        ;;
 (p7)   tbit.z p6,p7=r18,_PAGE_P_BIT            // page present bit cleared?
@@ -192,14 +206,21 @@ ENTRY(vhpt_miss)
         * between reading the pagetable and the "itc".  If so, flush the entry we
         * inserted and retry.
         */
-       ld8 r25=[r21]                           // read L3 PTE again
-       ld8 r26=[r17]                           // read L2 entry again
+       ld8 r25=[r21]                           // read L4 entry again
+       ld8 r26=[r17]                           // read L3 PTE again
+#ifdef CONFIG_PGTABLE_4
+       ld8 r18=[r28]                           // read L2 entry again
+#endif
+       cmp.ne p6,p7=r0,r0
        ;;
-       cmp.ne p6,p7=r26,r20                    // did L2 entry change
+       cmp.ne.or.andcm p6,p7=r26,r20           // did L3 entry change
+#ifdef CONFIG_PGTABLE_4
+       cmp.ne.or.andcm p6,p7=r29,r18           // did L4 PTE change
+#endif
        mov r27=PAGE_SHIFT<<2
        ;;
 (p6)   ptc.l r22,r27                           // purge PTE page translation
-(p7)   cmp.ne.or.andcm p6,p7=r25,r18           // did L3 PTE change
+(p7)   cmp.ne.or.andcm p6,p7=r25,r18           // did L4 PTE change
        ;;
 (p6)   ptc.l r16,r27                           // purge translation
 #endif
@@ -432,18 +453,30 @@ ENTRY(nested_dtlb_miss)
 (p6)   dep r17=r18,r19,3,(PAGE_SHIFT-3)        // r17=PTA + IFA(33,42)*8
 (p7)   dep r17=r18,r17,3,(PAGE_SHIFT-6)        // r17=PTA + (((IFA(61,63) << 7) | IFA(33,39))*8)
        cmp.eq p7,p6=0,r21                      // unused address bits all zeroes?
-       shr.u r18=r22,PMD_SHIFT                 // shift L2 index into position
+#ifdef CONFIG_PGTABLE_4
+       shr.u r18=r22,PUD_SHIFT                 // shift L2 index into position
+#else
+       shr.u r18=r22,PMD_SHIFT                 // shift L3 index into position
+#endif
        ;;
        ld8 r17=[r17]                           // fetch the L1 entry (may be 0)
        ;;
 (p7)   cmp.eq p6,p7=r17,r0                     // was L1 entry NULL?
        dep r17=r18,r17,3,(PAGE_SHIFT-3)        // compute address of L2 page table entry
        ;;
+#ifdef CONFIG_PGTABLE_4
 (p7)   ld8 r17=[r17]                           // fetch the L2 entry (may be 0)
-       shr.u r19=r22,PAGE_SHIFT                // shift L3 index into position
+       shr.u r18=r22,PMD_SHIFT                 // shift L3 index into position
        ;;
 (p7)   cmp.eq.or.andcm p6,p7=r17,r0            // was L2 entry NULL?
-       dep r17=r19,r17,3,(PAGE_SHIFT-3)        // compute address of L3 page table entry
+       dep r17=r18,r17,3,(PAGE_SHIFT-3)        // compute address of L2 page table entry
+       ;;
+#endif
+(p7)   ld8 r17=[r17]                           // fetch the L3 entry (may be 0)
+       shr.u r19=r22,PAGE_SHIFT                // shift L4 index into position
+       ;;
+(p7)   cmp.eq.or.andcm p6,p7=r17,r0            // was L3 entry NULL?
+       dep r17=r19,r17,3,(PAGE_SHIFT-3)        // compute address of L4 page table entry
 (p6)   br.cond.spnt page_fault
        mov b0=r30
        br.sptk.many b0                         // return to continuation point