From 483dcf538ea2ac86914bf7deef1d07f3b48d8878 Mon Sep 17 00:00:00 2001
From: pbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Sun, 12 Nov 2006 20:55:05 +0000
Subject: [PATCH] Avoid redundant TLB flushes (Daniel Jacobowitz).

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2211 c046a42c-6fe2-441c-8c8c-71466251a162
---
 target-mips/op_helper.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c
index bf397c9..6e31436 100644
--- a/target-mips/op_helper.c
+++ b/target-mips/op_helper.c
@@ -572,8 +572,17 @@ static void invalidate_tlb (int idx)
 {
     tlb_t *tlb;
     target_ulong addr;
+    uint8_t ASID;
+
+    ASID = env->CP0_EntryHi & 0xFF;
 
     tlb = &env->tlb[idx];
+    /* The qemu TLB is flushed then the ASID changes, so no need to
+       flush these entries again.  */
+    if (tlb->G == 0 && tlb->ASID != ASID) {
+        return;
+    }
+
     if (tlb->V0) {
         tb_invalidate_page_range(tlb->PFN[0], tlb->end - tlb->VPN);
         addr = tlb->VPN;
-- 
2.7.4