[S390] hibernation: reset system after resume

Force system into defined state after resume.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 40 insertions, 2 deletions

diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S
index 9a86ccb91a8a..fc056810a017 100644
--- a/arch/s390/kernel/swsusp_asm64.S
+++ b/arch/s390/kernel/swsusp_asm64.S
@@ -108,7 +108,8 @@ swsusp_arch_resume:
 #ifdef CONFIG_SMP
         /* Save boot cpu number */
         brasl   %r14,smp_get_phys_cpu_id
-        lgr     %r10,%r2
+        larl    %r1,saved_cpu_id
+        st      %r2,0(%r1)
 #endif
         /* Deactivate DAT */
         stnsm   __SF_EMPTY(%r15),0xfb
@@ -136,6 +137,29 @@ swsusp_arch_resume:
 2:
         ptlb                            /* flush tlb */
 
+        /* Reset System */
+        larl    %r1,restart_entry
+        larl    %r2,restart_psw
+        og      %r1,0(%r2)
+        stg     %r1,0(%r0)
+        larl    %r1,saved_pgm_check_psw
+        mvc     0(16,%r1),__LC_PGM_NEW_PSW(%r0)
+        larl    %r1,new_pgm_check_psw
+        epsw    %r2,%r3
+        stm     %r2,%r3,0(%r1)
+        mvc     __LC_PGM_NEW_PSW(16,%r0),0(%r1)
+        lghi    %r0,0
+        diag    %r0,%r0,0x308
+restart_entry:
+        lhi     %r1,1
+        sigp    %r1,%r0,0x12
+        sam64
+        larl    %r1,new_pgm_check_psw
+        lpswe   0(%r1)
+pgm_check_entry:
+        larl    %r1,saved_pgm_check_psw
+        mvc     __LC_PGM_NEW_PSW(16,%r0),0(%r1)
+
         /* Restore registers */
         lghi    %r13,0x1000             /* %r1 = pointer to save arae */
 
@@ -171,7 +195,8 @@ swsusp_arch_resume:
 
 #ifdef CONFIG_SMP
         /* Switch CPUs */
-        lgr     %r2,%r10                /* get cpu id */
+        larl    %r1,saved_cpu_id
+        llgf    %r2,0(%r1)
         llgf    %r3,0x318(%r13)
         brasl   %r14,smp_switch_boot_cpu_in_resume
 #endif
@@ -189,3 +214,16 @@ swsusp_arch_resume:
         lmg     %r6,%r15,STACK_FRAME_OVERHEAD + __SF_GPRS(%r15)
         lghi    %r2,0
         br      %r14
+
+        .section .data.nosave,"aw",@progbits
+        .align  8
+restart_psw:
+        .long   0x00080000,0x80000000
+new_pgm_check_psw:
+        .quad   0,pgm_check_entry
+saved_pgm_check_psw:
+        .quad   0,0
+#ifdef CONFIG_SMP
+saved_cpu_id:
+        .long   0
+#endif