From 3b1c8be4f4f1b5d4114320aaf41ec4872ab4598c Mon Sep 17 00:00:00 2001
From: ths <ths@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Mon, 22 Jan 2007 20:50:42 +0000
Subject: [PATCH] Fix PageMask handling, second part.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2345 c046a42c-6fe2-441c-8c8c-71466251a162
---
 target-mips/cpu.h       |  3 +--
 target-mips/helper.c    | 47 +++++++++++++++++++++++++++++++++--------------
 target-mips/op_helper.c |  2 ++
 3 files changed, 36 insertions(+), 16 deletions(-)

diff --git a/target-mips/cpu.h b/target-mips/cpu.h
index c1b13d902d..c1001c7fce 100644
--- a/target-mips/cpu.h
+++ b/target-mips/cpu.h
@@ -44,8 +44,7 @@ union fpr_t {
 typedef struct tlb_t tlb_t;
 struct tlb_t {
     target_ulong VPN;
-    target_ulong end;
-    target_ulong end2;
+    uint_fast32_t PageMask;
     uint_fast8_t ASID;
     uint_fast16_t G:1;
     uint_fast16_t C0:3;
diff --git a/target-mips/helper.c b/target-mips/helper.c
index 091dbffb7f..d2d7a9f871 100644
--- a/target-mips/helper.c
+++ b/target-mips/helper.c
@@ -41,23 +41,26 @@ enum {
 static int map_address (CPUState *env, target_ulong *physical, int *prot,
                         target_ulong address, int rw, int access_type)
 {
-    target_ulong tag = address & (TARGET_PAGE_MASK << 1);
-    uint8_t ASID = env->CP0_EntryHi & 0xFF;
-    tlb_t *tlb;
-    int i, n;
+    int i;
 
     for (i = 0; i < env->tlb_in_use; i++) {
-        tlb = &env->tlb[i];
+        tlb_t *tlb = &env->tlb[i];
+        /* 1k pages are not supported. */
+        uint8_t ASID = env->CP0_EntryHi & 0xFF;
+        target_ulong mask = tlb->PageMask | 0x1FFF;
+        target_ulong tag = address & ~mask;
+        int n;
+
         /* Check ASID, virtual page number & size */
         if ((tlb->G == 1 || tlb->ASID == ASID) &&
             tlb->VPN == tag) {
             /* TLB match */
-            n = (address >> TARGET_PAGE_BITS) & 1;
+            n = !!(address & mask & ~(mask >> 1));
             /* Check access rights */
            if (!(n ? tlb->V1 : tlb->V0))
                 return TLBRET_INVALID;
            if (rw == 0 || (n ? tlb->D1 : tlb->D0)) {
-                *physical = tlb->PFN[n] | (address & ~TARGET_PAGE_MASK);
+                *physical = tlb->PFN[n] | (address & (mask >> 1));
                 *prot = PAGE_READ;
                 if (n ? tlb->D1 : tlb->D0)
                     *prot |= PAGE_WRITE;
@@ -420,9 +423,10 @@ void do_interrupt (CPUState *env)
 void invalidate_tlb (CPUState *env, int idx, int use_extra)
 {
     tlb_t *tlb;
-    uint8_t ASID;
-
-    ASID = env->CP0_EntryHi & 0xFF;
+    target_ulong addr;
+    target_ulong end;
+    uint8_t ASID = env->CP0_EntryHi & 0xFF;
+    target_ulong mask;
 
     tlb = &env->tlb[idx];
     /* The qemu TLB is flushed then the ASID changes, so no need to
@@ -440,8 +444,23 @@ void invalidate_tlb (CPUState *env, int idx, int use_extra)
         return;
     }
 
-    if (tlb->V0)
-            tlb_flush_page (env, tlb->VPN);
-    if (tlb->V1)
-            tlb_flush_page (env, tlb->VPN + TARGET_PAGE_SIZE);
+    /* 1k pages are not supported. */
+    mask = tlb->PageMask | 0x1FFF;
+    if (tlb->V0) {
+        addr = tlb->VPN;
+        end = addr | (mask >> 1);
+        while (addr < end) {
+            tlb_flush_page (env, addr);
+            addr += TARGET_PAGE_SIZE;
+        }
+    }
+    if (tlb->V1) {
+        addr = tlb->VPN | ((mask >> 1) + 1);
+        addr = tlb->VPN + TARGET_PAGE_SIZE;
+        end = addr | mask;
+        while (addr < end) {
+            tlb_flush_page (env, addr);
+            addr += TARGET_PAGE_SIZE;
+        }
+    }
 }
diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c
index 849482478d..4326b6621d 100644
--- a/target-mips/op_helper.c
+++ b/target-mips/op_helper.c
@@ -392,6 +392,7 @@ static void fill_tlb (int idx)
     tlb = &env->tlb[idx];
     tlb->VPN = env->CP0_EntryHi & (int32_t)0xFFFFE000;
     tlb->ASID = env->CP0_EntryHi & 0xFF;
+    tlb->PageMask = env->CP0_PageMask;
     tlb->G = env->CP0_EntryLo0 & env->CP0_EntryLo1 & 1;
     tlb->V0 = (env->CP0_EntryLo0 & 2) != 0;
     tlb->D0 = (env->CP0_EntryLo0 & 4) != 0;
@@ -473,6 +474,7 @@ void do_tlbr (void)
     mips_tlb_flush_extra(env, MIPS_TLB_NB);
 
     env->CP0_EntryHi = tlb->VPN | tlb->ASID;
+    env->CP0_PageMask = tlb->PageMask;
     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