From c69b6151e7f242b02f261f321c392e5ef933176f Mon Sep 17 00:00:00 2001
From: David Gibson <david@gibson.dropbear.id.au>
Date: Tue, 12 Mar 2013 00:31:08 +0000
Subject: target-ppc: Disentangle find_pte()

32-bit and 64-bit hash MMU implementations currently share a find_pte
function.  This results in a whole bunch of ugly conditionals in the shared
function, and not all that much actually shared code.

This patch separates out the 32-bit and 64-bit versions, putting then
in mmu-hash64.c and mmu-has32.c, and removes the conditionals from
both versions.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 target-ppc/mmu-hash32.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 76 insertions(+), 2 deletions(-)

(limited to 'target-ppc/mmu-hash32.c')

diff --git a/target-ppc/mmu-hash32.c b/target-ppc/mmu-hash32.c
index ce5389d217..f852e5c67e 100644
--- a/target-ppc/mmu-hash32.c
+++ b/target-ppc/mmu-hash32.c
@@ -42,8 +42,8 @@ static inline int pte_is_valid_hash32(target_ulong pte0)
     return pte0 & 0x80000000 ? 1 : 0;
 }
 
-int pte_check_hash32(mmu_ctx_t *ctx, target_ulong pte0,
-                     target_ulong pte1, int h, int rw, int type)
+static int pte_check_hash32(mmu_ctx_t *ctx, target_ulong pte0,
+                            target_ulong pte1, int h, int rw, int type)
 {
     target_ulong ptem, mmask;
     int access, ret, pteh, ptev, pp;
@@ -83,3 +83,77 @@ int pte_check_hash32(mmu_ctx_t *ctx, target_ulong pte0,
 
     return ret;
 }
+
+/* PTE table lookup */
+int find_pte32(CPUPPCState *env, mmu_ctx_t *ctx, int h,
+               int rw, int type, int target_page_bits)
+{
+    hwaddr pteg_off;
+    target_ulong pte0, pte1;
+    int i, good = -1;
+    int ret, r;
+
+    ret = -1; /* No entry found */
+    pteg_off = get_pteg_offset(env, ctx->hash[h], HASH_PTE_SIZE_32);
+    for (i = 0; i < 8; i++) {
+        if (env->external_htab) {
+            pte0 = ldl_p(env->external_htab + pteg_off + (i * 8));
+            pte1 = ldl_p(env->external_htab + pteg_off + (i * 8) + 4);
+        } else {
+            pte0 = ldl_phys(env->htab_base + pteg_off + (i * 8));
+            pte1 = ldl_phys(env->htab_base + pteg_off + (i * 8) + 4);
+        }
+        r = pte_check_hash32(ctx, pte0, pte1, h, rw, type);
+        LOG_MMU("Load pte from %08" HWADDR_PRIx " => " TARGET_FMT_lx " "
+                TARGET_FMT_lx " %d %d %d " TARGET_FMT_lx "\n",
+                pteg_off + (i * 8), pte0, pte1, (int)(pte0 >> 31), h,
+                (int)((pte0 >> 6) & 1), ctx->ptem);
+        switch (r) {
+        case -3:
+            /* PTE inconsistency */
+            return -1;
+        case -2:
+            /* Access violation */
+            ret = -2;
+            good = i;
+            break;
+        case -1:
+        default:
+            /* No PTE match */
+            break;
+        case 0:
+            /* access granted */
+            /* XXX: we should go on looping to check all PTEs consistency
+             *      but if we can speed-up the whole thing as the
+             *      result would be undefined if PTEs are not consistent.
+             */
+            ret = 0;
+            good = i;
+            goto done;
+        }
+    }
+    if (good != -1) {
+    done:
+        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 (pte_update_flags(ctx, &pte1, ret, rw) == 1) {
+            if (env->external_htab) {
+                stl_p(env->external_htab + pteg_off + (good * 8) + 4,
+                      pte1);
+            } else {
+                stl_phys_notdirty(env->htab_base + pteg_off +
+                                  (good * 8) + 4, pte1);
+            }
+        }
+    }
+
+    /* We have a TLB that saves 4K pages, so let's
+     * split a huge page to 4k chunks */
+    if (target_page_bits != TARGET_PAGE_BITS) {
+        ctx->raddr |= (ctx->eaddr & ((1 << target_page_bits) - 1))
+                      & TARGET_PAGE_MASK;
+    }
+    return ret;
+}
-- 
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