diff options
Diffstat (limited to 'arch/ia64/kernel')
| -rw-r--r-- | arch/ia64/kernel/machine_kexec.c | 12 | ||||
| -rw-r--r-- | arch/ia64/kernel/mca_asm.S | 20 |
2 files changed, 32 insertions, 0 deletions
diff --git a/arch/ia64/kernel/machine_kexec.c b/arch/ia64/kernel/machine_kexec.c index 0823de1f6eb..571d66373e0 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 8d2eabe3119..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 |