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-rw-r--r--arch/ia64/kernel/mca_asm.S47
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/ia64/kernel/mca_asm.S b/arch/ia64/kernel/mca_asm.S
index a06d46548ff..7461d2573d4 100644
--- a/arch/ia64/kernel/mca_asm.S
+++ b/arch/ia64/kernel/mca_asm.S
@@ -40,6 +40,7 @@
.global ia64_do_tlb_purge
.global ia64_os_mca_dispatch
+ .global ia64_os_init_on_kdump
.global ia64_os_init_dispatch_monarch
.global ia64_os_init_dispatch_slave
@@ -299,6 +300,25 @@ END(ia64_os_mca_virtual_begin)
//StartMain////////////////////////////////////////////////////////////////////
//
+// NOP init handler for kdump. In panic situation, we may receive INIT
+// while kernel transition. Since we initialize registers on leave from
+// current kernel, no longer monarch/slave handlers of current kernel in
+// virtual mode are called safely.
+// We can unregister these init handlers from SAL, however then the INIT
+// will result in warmboot by SAL and we cannot retrieve the crashdump.
+// Therefore register this NOP function to SAL, to prevent entering virtual
+// mode and resulting warmboot by SAL.
+//
+ia64_os_init_on_kdump:
+ mov r8=r0 // IA64_INIT_RESUME
+ mov r9=r10 // SAL_GP
+ mov r22=r17 // *minstate
+ ;;
+ mov r10=r0 // return to same context
+ mov b0=r12 // SAL_CHECK return address
+ br b0
+
+//
// SAL to OS entry point for INIT on all processors. This has been defined for
// registration purposes with SAL as a part of ia64_mca_init. Monarch and
// slave INIT have identical processing, except for the value of the
@@ -1073,3 +1093,30 @@ GLOBAL_ENTRY(ia64_get_rnat)
mov ar.rsc=3
br.ret.sptk.many rp
END(ia64_get_rnat)
+
+
+// void ia64_set_psr_mc(void)
+//
+// Set psr.mc bit to mask MCA/INIT.
+GLOBAL_ENTRY(ia64_set_psr_mc)
+ rsm psr.i | psr.ic // disable interrupts
+ ;;
+ srlz.d
+ ;;
+ mov r14 = psr // get psr{36:35,31:0}
+ movl r15 = 1f
+ ;;
+ dep r14 = -1, r14, PSR_MC, 1 // set psr.mc
+ ;;
+ dep r14 = -1, r14, PSR_IC, 1 // set psr.ic
+ ;;
+ dep r14 = -1, r14, PSR_BN, 1 // keep bank1 in use
+ ;;
+ mov cr.ipsr = r14
+ mov cr.ifs = r0
+ mov cr.iip = r15
+ ;;
+ rfi
+1:
+ br.ret.sptk.many rp
+END(ia64_set_psr_mc)