diff options
Diffstat (limited to 'arch/ia64/kernel/mca_asm.S')
| -rw-r--r-- | arch/ia64/kernel/mca_asm.S | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/ia64/kernel/mca_asm.S b/arch/ia64/kernel/mca_asm.S index a06d46548ff9..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 @@ -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) |