[Xen-changelog] Finish reserved VA bit assignment, handle uncached address

[BitKeeper Bot <riel@xxxxxxxxxxx>]

ChangeSet 1.1709.1.2, 2005/06/13 14:50:16-06:00, djm@xxxxxxxxxxxxxxx

        Finish reserved VA bit assignment, handle uncached address
        range with lower half (0xe8...0-0xefff...f) of reserved
        range in region 7
        Signed-off by: Dan Magenheimer <dan.magenheimer@xxxxxx>



 ivt.S                   |   31 +++++++++++++++++++++++--------
 patch/linux-2.6.11/io.h |    1 -
 2 files changed, 23 insertions(+), 9 deletions(-)


diff -Nru a/xen/arch/ia64/ivt.S b/xen/arch/ia64/ivt.S
--- a/xen/arch/ia64/ivt.S       2005-06-19 14:03:33 -04:00
+++ b/xen/arch/ia64/ivt.S       2005-06-19 14:03:33 -04:00
@@ -367,9 +367,15 @@
 #endif
        extr.u r23=r21,IA64_PSR_CPL0_BIT,2      // extract psr.cpl
        and r19=r19,r16         // clear ed, reserved bits, and PTE control bits
+#ifdef XEN
+       shr.u r18=r16,55        // move address bit 59 to bit 4
+       ;;
+       and r18=0x10,r18        // bit 4=address-bit(59)
+#else
        shr.u r18=r16,57        // move address bit 61 to bit 4
        ;;
        andcm r18=0x10,r18      // bit 4=~address-bit(61)
+#endif
        cmp.ne p8,p0=r0,r23     // psr.cpl != 0?
        or r19=r17,r19          // insert PTE control bits into r19
        ;;
@@ -414,24 +420,33 @@
        extr.u r23=r21,IA64_PSR_CPL0_BIT,2      // extract psr.cpl
        and r22=IA64_ISR_CODE_MASK,r20          // get the isr.code field
        tbit.nz p6,p7=r20,IA64_ISR_SP_BIT       // is speculation bit on?
+#ifdef XEN
+       shr.u r18=r16,55                        // move address bit 59 to bit 4
+       and r19=r19,r16                         // clear ed, reserved bits, and 
PTE control bits
+       tbit.nz p9,p0=r20,IA64_ISR_NA_BIT       // is non-access bit on?
+       ;;
+       and r18=0x10,r18        // bit 4=address-bit(59)
+#else
        shr.u r18=r16,57                        // move address bit 61 to bit 4
        and r19=r19,r16                         // clear ed, reserved bits, and 
PTE control bits
        tbit.nz p9,p0=r20,IA64_ISR_NA_BIT       // is non-access bit on?
        ;;
        andcm r18=0x10,r18      // bit 4=~address-bit(61)
+#endif
        cmp.ne p8,p0=r0,r23
 (p9)   cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22  // check isr.code field
 (p8)   br.cond.spnt page_fault
 #ifdef XEN
        ;;
-       // FIXME: inadequate test, this is where we test for Xen address
-       // note that 0xf000 (cached) and 0xd000 (uncached) addresses
-       // should be OK.  (Though no I/O is done in Xen, EFI needs uncached
-       // addresses and some domain EFI calls are passed through)
-       tbit.nz p0,p8=r16,60
-(p8)   br.cond.spnt page_fault
-//(p8) br.cond.spnt 0
-       ;;
+       // Test for Xen address, if not handle via page_fault
+       // note that 0xf000 (cached) and 0xe800 (uncached) addresses
+       // should be OK.
+       extr.u r22=r16,59,5;;
+       cmp.eq p8,p0=0x1e,r22
+(p8)   br.cond.spnt 1f;;
+       cmp.ne p8,p0=0x1d,r22
+(p8)   br.cond.sptk page_fault ;;
+1:
 #endif
 
        dep r21=-1,r21,IA64_PSR_ED_BIT,1
diff -Nru a/xen/arch/ia64/patch/linux-2.6.11/io.h 
b/xen/arch/ia64/patch/linux-2.6.11/io.h
--- a/xen/arch/ia64/patch/linux-2.6.11/io.h     2005-06-19 14:03:33 -04:00
+++ b/xen/arch/ia64/patch/linux-2.6.11/io.h     2005-06-19 14:03:33 -04:00
@@ -5,7 +5,7 @@
  #define SLOW_DOWN_IO  do { } while (0)
  
 +#ifdef XEN
-+#define __IA64_UNCACHED_OFFSET        0xd000000000000000UL    /* region 6 */
++#define __IA64_UNCACHED_OFFSET        0xe800000000000000UL
 +#else
  #define __IA64_UNCACHED_OFFSET        0xc000000000000000UL    /* region 6 */
 +#endif

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