Recent kernels are not booting on some HP systems (though
it does boot on others). James spent time and tracked it
to this patch in the pvops series:
commit 498c5170472ff0c03a29d22dbd33225a0be038f4
Author: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Date: Mon May 19 22:13:38 2008 +0900
[IA64] pvops: paravirtualize ivt.S
I did a quick compile with and without this patch applied and
compared the diassembled ivt.o file and spotted two places
where an _FROM_ macro had been used where _TO_ was intended.
See the <<<<< OOPS below:
@@ -1360,26 +1357,26 @@ ENTRY(speculation_vector)
*
* cr.imm contains zero_ext(imm21)
*/
- mov r18=cr.iim
+ MOV_FROM_IIM(r18)
;;
- mov r17=cr.iip
+ MOV_FROM_IIP(r17)
shl r18=r18,43 // put sign bit in position (43=64-21)
;;
- mov r16=cr.ipsr
+ MOV_FROM_IPSR(p0, r16)
shr r18=r18,39 // sign extend (39=43-4)
;;
add r17=r17,r18 // now add the offset
;;
- mov cr.iip=r17
+ MOV_FROM_IIP(r17) <<<<<<< OOPS!
dep r16=0,r16,41,2 // clear EI
;;
- mov cr.ipsr=r16
+ MOV_FROM_IPSR(p0, r16) <<<<<<<< OOPS!
;;
- rfi // and go back
+ RFI
END(speculation_vector)
I don't know whether these are the cause of the problems on James'
and Willy's machines (could you try swapping these round please?)
-Tony
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