target-ppc: Use QOM method dispatch for MMU fault handling

After previous cleanups, the many scattered checks of env->mmu_model in
the ppc MMU implementation have, at least for "classic" hash MMUs been
reduced (almost) to a single switch at the top of
cpu_ppc_handle_mmu_fault().

An explicit switch is still a pretty ugly way of handling this though.  Now
that Andreas Färber's CPU QOM cleanups for ppc have gone in, it's quite
straightforward to instead make the handle_mmu_fault function a QOM method
on the CPU object.

This patch implements such a scheme, initializing the method pointer at
the same time as the mmu_model variable.  We need to keep the latter around
for now, because of the MMU types (BookE, 4xx, et al) which haven't been
converted to the new scheme yet, and also for a few other uses.  It would
be good to clean those up eventually.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 7 insertions, 17 deletions

diff --git a/target-ppc/mmu_helper.c b/target-ppc/mmu_helper.c
index 4c41673383..acf01331f1 100644
--- a/target-ppc/mmu_helper.c
+++ b/target-ppc/mmu_helper.c
@@ -1391,22 +1391,6 @@ static int cpu_ppc_handle_mmu_fault(CPUPPCState *env, target_ulong address,
     int access_type;
     int ret = 0;
 
-    switch (env->mmu_model) {
-#if defined(TARGET_PPC64)
-    case POWERPC_MMU_64B:
-    case POWERPC_MMU_2_06:
-    case POWERPC_MMU_2_06d:
-        return ppc_hash64_handle_mmu_fault(env, address, rw, mmu_idx);
-#endif
-
-    case POWERPC_MMU_32B:
-    case POWERPC_MMU_601:
-        return ppc_hash32_handle_mmu_fault(env, address, rw, mmu_idx);
-
-    default:
-        ; /* Otherwise fall through to the general code below */
-    }
-
     if (rw == 2) {
         /* code access */
         rw = 0;
@@ -2802,9 +2786,15 @@ void helper_booke206_tlbflush(CPUPPCState *env, uint32_t type)
 void tlb_fill(CPUPPCState *env, target_ulong addr, int is_write, int mmu_idx,
               uintptr_t retaddr)
 {
+    CPUState *cpu = ENV_GET_CPU(env);
+    PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
     int ret;
 
-    ret = cpu_ppc_handle_mmu_fault(env, addr, is_write, mmu_idx);
+    if (pcc->handle_mmu_fault) {
+        ret = pcc->handle_mmu_fault(env, addr, is_write, mmu_idx);
+    } else {
+        ret = cpu_ppc_handle_mmu_fault(env, addr, is_write, mmu_idx);
+    }
     if (unlikely(ret != 0)) {
         if (likely(retaddr)) {
             /* now we have a real cpu fault */