From 3d2887cb5b84a9a47f5e5c5f885e76a27b7779a9 Mon Sep 17 00:00:00 2001
From: blueswir1 <blueswir1@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Sat, 27 Sep 2008 19:43:18 +0000
Subject: [PATCH] Add mmu tlb demap support (Igor Kovalenko)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5332 c046a42c-6fe2-441c-8c8c-71466251a162
---
 target-sparc/op_helper.c | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/target-sparc/op_helper.c b/target-sparc/op_helper.c
index fb24fc8..d01d9da 100644
--- a/target-sparc/op_helper.c
+++ b/target-sparc/op_helper.c
@@ -1941,6 +1941,8 @@ void helper_st_asi(target_ulong addr, target_ulong val, int asi, int size)
         }
     case 0x55: // I-MMU data access
         {
+            // TODO: auto demap
+
             unsigned int i = (addr >> 3) & 0x3f;
 
             env->itlb_tag[i] = env->immuregs[6];
@@ -1948,7 +1950,22 @@ void helper_st_asi(target_ulong addr, target_ulong val, int asi, int size)
             return;
         }
     case 0x57: // I-MMU demap
-        // XXX
+        {
+            unsigned int i;
+
+            for (i = 0; i < 64; i++) {
+                if ((env->itlb_tte[i] & 0x8000000000000000ULL) != 0) {
+                    target_ulong mask = 0xffffffffffffe000ULL;
+
+                    mask <<= 3 * ((env->itlb_tte[i] >> 61) & 3);
+                    if ((val & mask) == (env->itlb_tag[i] & mask)) {
+                        env->itlb_tag[i] = 0;
+                        env->itlb_tte[i] = 0;
+                    }
+                    return;
+                }
+            }
+        }
         return;
     case 0x58: // D-MMU regs
         {
@@ -2018,6 +2035,23 @@ void helper_st_asi(target_ulong addr, target_ulong val, int asi, int size)
             return;
         }
     case 0x5f: // D-MMU demap
+        {
+            unsigned int i;
+
+            for (i = 0; i < 64; i++) {
+                if ((env->dtlb_tte[i] & 0x8000000000000000ULL) != 0) {
+                    target_ulong mask = 0xffffffffffffe000ULL;
+
+                    mask <<= 3 * ((env->dtlb_tte[i] >> 61) & 3);
+                    if ((val & mask) == (env->dtlb_tag[i] & mask)) {
+                        env->dtlb_tag[i] = 0;
+                        env->dtlb_tte[i] = 0;
+                    }
+                    return;
+                }
+            }
+        }
+        return;
     case 0x49: // Interrupt data receive
         // XXX
         return;
-- 
2.7.4