[Xen-changelog] [xen-unstable] [IA64] clean-up in ivt.S: remove useless code.

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

# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1180988075 21600
# Node ID f3f59dafaa18bd36b13f3ac36d0dfad926a666df
# Parent  ab677b67b4a502e34695600849f94da3e9bfbfe1
[IA64] clean-up in ivt.S: remove useless code.

The tests just before the #if VHPT_ENABLED makes the block of code useless.

Signed-off-by: Tristan Gingold <tgingold@xxxxxxx>
---
 xen/arch/ia64/xen/ivt.S |   70 ++++--------------------------------------------
 1 files changed, 6 insertions(+), 64 deletions(-)

diff -r ab677b67b4a5 -r f3f59dafaa18 xen/arch/ia64/xen/ivt.S
--- a/xen/arch/ia64/xen/ivt.S   Mon Jun 04 14:12:19 2007 -0600
+++ b/xen/arch/ia64/xen/ivt.S   Mon Jun 04 14:14:35 2007 -0600
@@ -119,9 +119,8 @@ 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
-       ;;
-       cmp.eq p6,p0=0x1d,r17
+       ;;
+       cmp.eq.or p6,p0=0x1d,r17
 (p6)   br.cond.spnt    late_alt_itlb_miss
        ;;
        mov pr = r31, 0x1ffff
@@ -140,68 +139,11 @@ ENTRY(dtlb_miss)
        ;;
        extr.u r17=r16,59,5
        ;;
-       cmp.eq p6,p0=0x1e,r17           // if the address belongs to VMM, go
-                                       //   to the alternate tlb handler
+       /* If address belongs to VMM, go to alt tlb handler */
+       cmp.eq p6,p0=0x1e,r17
+       ;;
+       cmp.eq.or p6,p0=0x1d,r17
 (p6)   br.cond.spnt    late_alt_dtlb_miss
-       ;;
-       cmp.eq p6,p0=0x1d,r17
-(p6)   br.cond.spnt    late_alt_dtlb_miss
-       ;;
-#if VHPT_ENABLED
-       mov r30=cr.ipsr                 // XXX TODO optimization
-       mov r28=cr.iip                  
-       mov r17=cr.isr
-       ;;
-
-       extr.u r18 = r30, IA64_PSR_CPL0_BIT, 2  // extract psr.cpl
-       ;; 
-       cmp.ne p6, p0 = r0, r18                 // cpl == 0?
-(p6)   br.cond.sptk 2f
-
-       tbit.nz p7,p0=r17,IA64_ISR_SP_BIT       // is speculation bit on?
-       ;; 
-(p7)   br.cond.spnt 2f
-
-       // Is the faulted iip in the vmm area?
-       //    -- check [59:58] bit
-       //    -- if 00, 11: guest
-       //    -- if 01, 10: vmm
-       extr.u r19 = r28, 58, 2
-       ;; 
-       cmp.eq p10, p0 = 0x0, r19
-(p10)  br.cond.sptk 2f
-       cmp.eq p11, p0 = 0x3, r19
-(p11)  br.cond.sptk 2f
-
-       // Is the faulted address is in the identity mapping area?
-       // must be either 0xf000... or 0xe8000...
-       extr.u r20 = r16, 59, 5
-       ;; 
-       cmp.eq p12, p0 = 0x1e, r20      // (0xf0 >> 3) = 0x1e
-(p12)  br.cond.spnt 1f
-       cmp.eq p0, p13 = 0x1d, r20      // (0xe8 >> 3) = 0x1d
-(p13)  br.cond.sptk 2f
-
-1:
-       movl r24=PAGE_KERNEL            // xen identity mapping area.
-       movl r25=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
-       ;;
-       shr.u r26=r16,55        // move address bit 59 to bit 4
-       and r25=r25,r16         // clear ed, reserved bits, and PTE control bits
-       ;;
-       and r26=0x10,r26        // bit 4=address-bit(59)
-       ;; 
-       or r25=r25,r24          // insert PTE control bits into r25
-       ;;
-       or r25=r25,r26          // set bit 4 (uncached) if the access was to
-                               //   region 6
-       ;;
-       itc.d r25               // insert the TLB entry
-       mov pr=r31,-1
-       rfi
-
-2:
-#endif 
        br.cond.sptk fast_tlb_miss_reflect
        ;;
 END(dtlb_miss)

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