From bc814401c2061f0d362f0fb709397a890df47e7c Mon Sep 17 00:00:00 2001
From: ths <ths@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Sun, 21 Jan 2007 03:12:25 +0000
Subject: [PATCH] Bring TLB / PageSize handling in line with real hardware
 behaviour.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2341 c046a42c-6fe2-441c-8c8c-71466251a162
---
 target-mips/helper.c    | 22 +++++-----------------
 target-mips/op_helper.c |  8 --------
 2 files changed, 5 insertions(+), 25 deletions(-)

diff --git a/target-mips/helper.c b/target-mips/helper.c
index 43038c2d7e..091dbffb7f 100644
--- a/target-mips/helper.c
+++ b/target-mips/helper.c
@@ -50,7 +50,7 @@ static int map_address (CPUState *env, target_ulong *physical, int *prot,
         tlb = &env->tlb[i];
         /* Check ASID, virtual page number & size */
         if ((tlb->G == 1 || tlb->ASID == ASID) &&
-            tlb->VPN == tag && address < tlb->end2) {
+            tlb->VPN == tag) {
             /* TLB match */
             n = (address >> TARGET_PAGE_BITS) & 1;
             /* Check access rights */
@@ -420,7 +420,6 @@ void do_interrupt (CPUState *env)
 void invalidate_tlb (CPUState *env, int idx, int use_extra)
 {
     tlb_t *tlb;
-    target_ulong addr;
     uint8_t ASID;
 
     ASID = env->CP0_EntryHi & 0xFF;
@@ -441,19 +440,8 @@ void invalidate_tlb (CPUState *env, int idx, int use_extra)
         return;
     }
 
-    if (tlb->V0) {
-        addr = tlb->VPN;
-        while (addr < tlb->end) {
-            tlb_flush_page (env, addr);
-            addr += TARGET_PAGE_SIZE;
-        }
-    }
-    if (tlb->V1) {
-        addr = tlb->end;
-        while (addr < tlb->end2) {
-            tlb_flush_page (env, addr);
-            addr += TARGET_PAGE_SIZE;
-        }
-    }
+    if (tlb->V0)
+            tlb_flush_page (env, tlb->VPN);
+    if (tlb->V1)
+            tlb_flush_page (env, tlb->VPN + TARGET_PAGE_SIZE);
 }
-
diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c
index f4eb6e6a03..849482478d 100644
--- a/target-mips/op_helper.c
+++ b/target-mips/op_helper.c
@@ -387,16 +387,11 @@ static void mips_tlb_flush_extra (CPUState *env, int first)
 static void fill_tlb (int idx)
 {
     tlb_t *tlb;
-    int size;
 
     /* XXX: detect conflicting TLBs and raise a MCHECK exception when needed */
     tlb = &env->tlb[idx];
     tlb->VPN = env->CP0_EntryHi & (int32_t)0xFFFFE000;
     tlb->ASID = env->CP0_EntryHi & 0xFF;
-    size = env->CP0_PageMask >> 13;
-    size = 4 * (size + 1);
-    tlb->end = tlb->VPN + (1 << (8 + size));
-    tlb->end2 = tlb->end + (1 << (8 + size));
     tlb->G = env->CP0_EntryLo0 & env->CP0_EntryLo1 & 1;
     tlb->V0 = (env->CP0_EntryLo0 & 2) != 0;
     tlb->D0 = (env->CP0_EntryLo0 & 4) != 0;
@@ -467,7 +462,6 @@ void do_tlbr (void)
 {
     tlb_t *tlb;
     uint8_t ASID;
-    int size;
 
     ASID = env->CP0_EntryHi & 0xFF;
     tlb = &env->tlb[env->CP0_index & (MIPS_TLB_NB - 1)];
@@ -479,8 +473,6 @@ void do_tlbr (void)
     mips_tlb_flush_extra(env, MIPS_TLB_NB);
 
     env->CP0_EntryHi = tlb->VPN | tlb->ASID;
-    size = (tlb->end - tlb->VPN) >> 12;
-    env->CP0_PageMask = (size - 1) << 13;
     env->CP0_EntryLo0 = tlb->G | (tlb->V0 << 1) | (tlb->D0 << 2) |
                         (tlb->C0 << 3) | (tlb->PFN[0] >> 6);
     env->CP0_EntryLo1 = tlb->G | (tlb->V1 << 1) | (tlb->D1 << 2) |
-- 
2.11.0