3 files changed, 33 insertions, 0 deletions

diff --git a/arch/ia64/include/asm/mca.h b/arch/ia64/include/asm/mca.h
index cb0952f51836..c171cdf0a789 100644
--- a/arch/ia64/include/asm/mca.h
+++ b/arch/ia64/include/asm/mca.h
@@ -145,6 +145,7 @@ extern void ia64_mca_ucmc_handler(struct pt_regs *, struct ia64_sal_os_state *);
 extern void ia64_init_handler(struct pt_regs *,
                               struct switch_stack *,
                               struct ia64_sal_os_state *);
+extern void ia64_os_init_on_kdump(void);
 extern void ia64_monarch_init_handler(void);
 extern void ia64_slave_init_handler(void);
 extern void ia64_mca_cmc_vector_setup(void);
diff --git a/arch/ia64/kernel/machine_kexec.c b/arch/ia64/kernel/machine_kexec.c
index 0823de1f6ebe..571d66373e0a 100644
--- a/arch/ia64/kernel/machine_kexec.c
+++ b/arch/ia64/kernel/machine_kexec.c
@@ -24,6 +24,8 @@
 #include <asm/delay.h>
 #include <asm/meminit.h>
 #include <asm/processor.h>
+#include <asm/sal.h>
+#include <asm/mca.h>
 
 typedef NORET_TYPE void (*relocate_new_kernel_t)(
                                         unsigned long indirection_page,
@@ -85,11 +87,21 @@ static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
         void *pal_addr = efi_get_pal_addr();
         unsigned long code_addr = (unsigned long)page_address(image->control_code_page);
         int ii;
+        u64 fp, gp;
+        ia64_fptr_t *init_handler = (ia64_fptr_t *)ia64_os_init_on_kdump;
 
         BUG_ON(!image);
         if (image->type == KEXEC_TYPE_CRASH) {
                 crash_save_this_cpu();
                 current->thread.ksp = (__u64)info->sw - 16;
+
+                /* Register noop init handler */
+                fp = ia64_tpa(init_handler->fp);
+                gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
+                ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
+        } else {
+                /* Unregister init handlers of current kernel */
+                ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
         }
 
         /* Interrupts aren't acceptable while we reboot */
diff --git a/arch/ia64/kernel/mca_asm.S b/arch/ia64/kernel/mca_asm.S
index 8d2eabe3119f..7461d2573d41 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