s390x: helper functions for system emulation

When running system emulation, we need to transverse through the MMU and
deliver interrupts according to the specification.

This patch implements those two pieces and in addition adjusts the CPU
initialization code to account for the new fields in CPUState.

Signed-off-by: Alexander Graf <agraf@suse.de>

target-s390x/op_helper.c

@@ -71,3 +71,9 @@ void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
 }
 
 #endif
+
+uint32_t calc_cc(CPUState *env, uint32_t cc_op, uint64_t src, uint64_t dst,
+                 uint64_t vr)
+{
+    return 0;
+}