[Qemu-devel] [PATCH 09/48] target-ppc: Disentangle get_physical_address() paths

[David Gibson <david@gibson.dropbear.id.au>]

Depending on the MSR state, for 64-bit hash MMUs, get_physical_address
can either call check_physical (which has further tests for mmu type)
or get_segment64.  Similarly for 32-bit hash MMUs we can either call
check_physucal or get_bat() and get_segment32().

This patch splits off the whole get_physical_addresss() path for hash
MMUs into 32-bit and 64-bit versions, handling real mode correctly for
such MMUs without going to check_physical and rechecking the mmu type.
Correspondingly, the hash MMU specific paths in check_physical() are
removed.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 target-ppc/cpu.h        |    2 ++
 target-ppc/mmu-hash32.c |   29 +++++++++++++++++++++++++++--
 target-ppc/mmu-hash32.h |    4 ++--
 target-ppc/mmu-hash64.c |   19 +++++++++++++++++--
 target-ppc/mmu-hash64.h |    4 ++--
 target-ppc/mmu_helper.c |   46 ++++++++--------------------------------------
 6 files changed, 58 insertions(+), 46 deletions(-)

diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index a9994cb..b76b09a 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -1138,6 +1138,8 @@ int pp_check(int key, int pp, int nx);
 int check_prot(int prot, int rw, int access_type);
 int pte_update_flags(mmu_ctx_t *ctx, target_ulong *pte1p, int ret, int rw);
 hwaddr get_pteg_offset(CPUPPCState *env, hwaddr hash, int pte_size);
+int get_bat(CPUPPCState *env, mmu_ctx_t *ctx,
+            target_ulong virtual, int rw, int type);
 #endif /* !defined(CONFIG_USER_ONLY) */
 void ppc_store_msr (CPUPPCState *env, target_ulong value);
 
diff --git a/target-ppc/mmu-hash32.c b/target-ppc/mmu-hash32.c
index 4bae72a..3998d63 100644
--- a/target-ppc/mmu-hash32.c
+++ b/target-ppc/mmu-hash32.c
@@ -158,8 +158,8 @@ static int find_pte32(CPUPPCState *env, mmu_ctx_t *ctx, int h,
     return ret;
 }
 
-int get_segment32(CPUPPCState *env, mmu_ctx_t *ctx,
-                  target_ulong eaddr, int rw, int type)
+static int get_segment32(CPUPPCState *env, mmu_ctx_t *ctx,
+                         target_ulong eaddr, int rw, int type)
 {
     hwaddr hash;
     target_ulong vsid;
@@ -302,3 +302,28 @@ int get_segment32(CPUPPCState *env, mmu_ctx_t *ctx,
 
     return ret;
 }
+
+int ppc_hash32_get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
+                                    target_ulong eaddr, int rw, int access_type)
+{
+    bool real_mode = (access_type == ACCESS_CODE && msr_ir == 0)
+        || (access_type != ACCESS_CODE && msr_dr == 0);
+
+    if (real_mode) {
+        ctx->raddr = eaddr;
+        ctx->prot = PAGE_READ | PAGE_EXEC | PAGE_WRITE;
+        return 0;
+    } else {
+        int ret = -1;
+
+        /* Try to find a BAT */
+        if (env->nb_BATs != 0) {
+            ret = get_bat(env, ctx, eaddr, rw, access_type);
+        }
+        if (ret < 0) {
+            /* We didn't match any BAT entry or don't have BATs */
+            ret = get_segment32(env, ctx, eaddr, rw, access_type);
+        }
+        return ret;
+    }
+}
diff --git a/target-ppc/mmu-hash32.h b/target-ppc/mmu-hash32.h
index 6f9a0c2..1318562 100644
--- a/target-ppc/mmu-hash32.h
+++ b/target-ppc/mmu-hash32.h
@@ -4,8 +4,8 @@
 #ifndef CONFIG_USER_ONLY
 
 int pte32_is_valid(target_ulong pte0);
-int get_segment32(CPUPPCState *env, mmu_ctx_t *ctx,
-                  target_ulong eaddr, int rw, int type);
+int ppc_hash32_get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
+                                    target_ulong eaddr, int rw, int access_type);
 
 #endif /* CONFIG_USER_ONLY */
 
diff --git a/target-ppc/mmu-hash64.c b/target-ppc/mmu-hash64.c
index 23eb480..c727298 100644
--- a/target-ppc/mmu-hash64.c
+++ b/target-ppc/mmu-hash64.c
@@ -350,8 +350,8 @@ static int find_pte64(CPUPPCState *env, mmu_ctx_t *ctx, int h,
     return ret;
 }
 
-int get_segment64(CPUPPCState *env, mmu_ctx_t *ctx,
-                  target_ulong eaddr, int rw, int type)
+static int get_segment64(CPUPPCState *env, mmu_ctx_t *ctx,
+                         target_ulong eaddr, int rw, int type)
 {
     hwaddr hash;
     target_ulong vsid;
@@ -435,3 +435,18 @@ int get_segment64(CPUPPCState *env, mmu_ctx_t *ctx,
 
     return ret;
 }
+
+int ppc_hash64_get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
+                                    target_ulong eaddr, int rw, int access_type)
+{
+    bool real_mode = (access_type == ACCESS_CODE && msr_ir == 0)
+        || (access_type != ACCESS_CODE && msr_dr == 0);
+
+    if (real_mode) {
+        ctx->raddr = eaddr & 0x0FFFFFFFFFFFFFFFULL;
+        ctx->prot = PAGE_READ | PAGE_EXEC | PAGE_WRITE;
+        return 0;
+    } else {
+        return get_segment64(env, ctx, eaddr, rw, access_type);
+    }
+}
diff --git a/target-ppc/mmu-hash64.h b/target-ppc/mmu-hash64.h
index 690c1d8..d8eb8de 100644
--- a/target-ppc/mmu-hash64.h
+++ b/target-ppc/mmu-hash64.h
@@ -6,8 +6,8 @@
 #ifdef TARGET_PPC64
 void dump_slb(FILE *f, fprintf_function cpu_fprintf, CPUPPCState *env);
 int ppc_store_slb (CPUPPCState *env, target_ulong rb, target_ulong rs);
-int get_segment64(CPUPPCState *env, mmu_ctx_t *ctx,
-                  target_ulong eaddr, int rw, int type);
+int ppc_hash64_get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
+                                    target_ulong eaddr, int rw, int access_type);
 #endif
 
 #endif /* CONFIG_USER_ONLY */
diff --git a/target-ppc/mmu_helper.c b/target-ppc/mmu_helper.c
index 5b82731..ce39f49 100644
--- a/target-ppc/mmu_helper.c
+++ b/target-ppc/mmu_helper.c
@@ -426,8 +426,8 @@ static inline void bat_601_size_prot(CPUPPCState *env, target_ulong *blp,
     *protp = prot;
 }
 
-static inline int get_bat(CPUPPCState *env, mmu_ctx_t *ctx,
-                          target_ulong virtual, int rw, int type)
+int get_bat(CPUPPCState *env, mmu_ctx_t *ctx,
+            target_ulong virtual, int rw, int type)
 {
     target_ulong *BATlt, *BATut, *BATu, *BATl;
     target_ulong BEPIl, BEPIu, bl;
@@ -1256,8 +1256,6 @@ static inline int check_physical(CPUPPCState *env, mmu_ctx_t *ctx,
     ctx->prot = PAGE_READ | PAGE_EXEC;
     ret = 0;
     switch (env->mmu_model) {
-    case POWERPC_MMU_32B:
-    case POWERPC_MMU_601:
     case POWERPC_MMU_SOFT_6xx:
     case POWERPC_MMU_SOFT_74xx:
     case POWERPC_MMU_SOFT_4xx:
@@ -1265,15 +1263,7 @@ static inline int check_physical(CPUPPCState *env, mmu_ctx_t *ctx,
     case POWERPC_MMU_BOOKE:
         ctx->prot |= PAGE_WRITE;
         break;
-#if defined(TARGET_PPC64)
-    case POWERPC_MMU_64B:
-    case POWERPC_MMU_2_06:
-    case POWERPC_MMU_2_06d:
-        /* Real address are 60 bits long */
-        ctx->raddr &= 0x0FFFFFFFFFFFFFFFULL;
-        ctx->prot |= PAGE_WRITE;
-        break;
-#endif
+
     case POWERPC_MMU_SOFT_4xx_Z:
         if (unlikely(msr_pe != 0)) {
             /* 403 family add some particular protections,
@@ -1298,15 +1288,10 @@ static inline int check_physical(CPUPPCState *env, mmu_ctx_t *ctx,
             }
         }
         break;
-    case POWERPC_MMU_MPC8xx:
-        /* XXX: TODO */
-        cpu_abort(env, "MPC8xx MMU model is not implemented\n");
-        break;
-    case POWERPC_MMU_BOOKE206:
-        cpu_abort(env, "BookE 2.06 MMU doesn't have physical real mode\n");
-        break;
+
     default:
-        cpu_abort(env, "Unknown or invalid MMU model\n");
+        /* Caller's checks mean we should never get here for other models */
+        abort();
         return -1;
     }
 
@@ -1327,18 +1312,7 @@ static int get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
     switch (env->mmu_model) {
     case POWERPC_MMU_32B:
     case POWERPC_MMU_601:
-        if (real_mode) {
-            ret = check_physical(env, ctx, eaddr, rw);
-        } else {
-            /* Try to find a BAT */
-            if (env->nb_BATs != 0) {
-                ret = get_bat(env, ctx, eaddr, rw, access_type);
-            }
-            if (ret < 0) {
-                /* We didn't match any BAT entry or don't have BATs */
-                ret = get_segment32(env, ctx, eaddr, rw, access_type);
-            }
-        }
+        ret = ppc_hash32_get_physical_address(env, ctx, eaddr, rw, access_type);
         break;
 
     case POWERPC_MMU_SOFT_6xx:
@@ -1361,11 +1335,7 @@ static int get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
     case POWERPC_MMU_64B:
     case POWERPC_MMU_2_06:
     case POWERPC_MMU_2_06d:
-        if (real_mode) {
-            ret = check_physical(env, ctx, eaddr, rw);
-        } else {
-            ret = get_segment64(env, ctx, eaddr, rw, access_type);
-        }
+        ret = ppc_hash64_get_physical_address(env, ctx, eaddr, rw, access_type);
         break;
 #endif
 
-- 
1.7.10.4