mmu-hash*: Separate PTEG searching from permissions checking

find_pte{32,64{() do several things.  First they search through a PTEG
ooking for a PTE matching our virtual address.  Then they do permissions
checking and other processing on that PTE.

This patch separates the search by VA out from the rest.  The search is
combined with the pte{32,64}_match() functions into new
ppc_has{32,64}_pteg_search() functions.

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

1 files changed, 34 insertions, 33 deletions

diff --git a/target-ppc/mmu-hash64.c b/target-ppc/mmu-hash64.c
index 8664116aab..66b2d2444b 100644
--- a/target-ppc/mmu-hash64.c
+++ b/target-ppc/mmu-hash64.c
@@ -299,14 +299,6 @@ static int ppc_hash64_check_prot(int prot, int rwx)
     return ret;
 }
 
-static bool pte64_match(target_ulong pte0, target_ulong pte1,
-                        bool secondary, target_ulong ptem)
-{
-    return (pte0 & HPTE64_V_VALID)
-        && (secondary == !!(pte0 & HPTE64_V_SECONDARY))
-        && HPTE64_V_COMPARE(pte0, ptem);
-}
-
 static int pte64_check(struct mmu_ctx_hash64 *ctx, target_ulong pte0,
                        target_ulong pte1, int rwx)
 {
@@ -334,8 +326,7 @@ static int pte64_check(struct mmu_ctx_hash64 *ctx, target_ulong pte0,
 }
 
 static int ppc_hash64_pte_update_flags(struct mmu_ctx_hash64 *ctx,
-                                       target_ulong *pte1p,
-                                       int ret, int rw)
+                                       uint64_t *pte1p, int ret, int rw)
 {
     int store = 0;
 
@@ -359,39 +350,49 @@ static int ppc_hash64_pte_update_flags(struct mmu_ctx_hash64 *ctx,
     return store;
 }
 
-/* PTE table lookup */
+static hwaddr ppc_hash64_pteg_search(CPUPPCState *env, hwaddr pteg_off,
+                                     bool secondary, target_ulong ptem,
+                                     ppc_hash_pte64_t *pte)
+{
+    hwaddr pte_offset = pteg_off;
+    target_ulong pte0, pte1;
+    int i;
+
+    for (i = 0; i < HPTES_PER_GROUP; i++) {
+        pte0 = ppc_hash64_load_hpte0(env, pte_offset);
+        pte1 = ppc_hash64_load_hpte1(env, pte_offset);
+
+        if ((pte0 & HPTE64_V_VALID)
+            && (secondary == !!(pte0 & HPTE64_V_SECONDARY))
+            && HPTE64_V_COMPARE(pte0, ptem)) {
+            pte->pte0 = pte0;
+            pte->pte1 = pte1;
+            return pte_offset;
+        }
+
+        pte_offset += HASH_PTE_SIZE_64;
+    }
+
+    return -1;
+}
+
 static int find_pte64(CPUPPCState *env, struct mmu_ctx_hash64 *ctx,
                       target_ulong eaddr, int h, int rwx, int target_page_bits)
 {
-    hwaddr pteg_off;
-    target_ulong pte0, pte1;
-    int i, good = -1;
+    hwaddr pteg_off, pte_offset;
+    ppc_hash_pte64_t pte;
     int ret;
 
     ret = -1; /* No entry found */
     pteg_off = (ctx->hash[h] * HASH_PTEG_SIZE_64) & env->htab_mask;
-    for (i = 0; i < HPTES_PER_GROUP; i++) {
-        pte0 = ppc_hash64_load_hpte0(env, pteg_off + i*HASH_PTE_SIZE_64);
-        pte1 = ppc_hash64_load_hpte1(env, pteg_off + i*HASH_PTE_SIZE_64);
-
-        LOG_MMU("Load pte from %016" HWADDR_PRIx " => " TARGET_FMT_lx " "
-                TARGET_FMT_lx " %d %d %d " TARGET_FMT_lx "\n",
-                pteg_off + (i * 16), pte0, pte1, !!(pte0 & HPTE64_V_VALID),
-                h, !!(pte0 & HPTE64_V_SECONDARY), ctx->ptem);
-
-        if (pte64_match(pte0, pte1, h, ctx->ptem)) {
-            good = i;
-            break;
-        }
-    }
-    if (good != -1) {
-        ret = pte64_check(ctx, pte0, pte1, rwx);
+    pte_offset = ppc_hash64_pteg_search(env, pteg_off, h, ctx->ptem, &pte);
+    if (pte_offset != -1) {
+        ret = pte64_check(ctx, pte.pte0, pte.pte1, rwx);
         LOG_MMU("found PTE at addr %08" HWADDR_PRIx " prot=%01x ret=%d\n",
                 ctx->raddr, ctx->prot, ret);
         /* Update page flags */
-        pte1 = ctx->raddr;
-        if (ppc_hash64_pte_update_flags(ctx, &pte1, ret, rwx) == 1) {
-            ppc_hash64_store_hpte1(env, pteg_off + good * HASH_PTE_SIZE_64, pte1);
+        if (ppc_hash64_pte_update_flags(ctx, &pte.pte1, ret, rwx) == 1) {
+            ppc_hash64_store_hpte1(env, pte_offset, pte.pte1);
         }
     }