[Qemu-devel] [6099] Implement ARMv7 MMU access permissions.

[Paul Brook <paul@nowt.org>]

Revision: 6099
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6099
Author:   pbrook
Date:     2008-12-19 12:39:00 +0000 (Fri, 19 Dec 2008)

Log Message:
-----------
Implement ARMv7 MMU access permissions.

Signed-off-by: Paul Brook <paul@codesourcery.com>

Modified Paths:
--------------
    trunk/target-arm/helper.c

Modified: trunk/target-arm/helper.c
===================================================================
--- trunk/target-arm/helper.c	2008-12-18 22:51:31 UTC (rev 6098)
+++ trunk/target-arm/helper.c	2008-12-19 12:39:00 UTC (rev 6099)
@@ -900,12 +900,16 @@
           return PAGE_READ | PAGE_WRITE;
   case 3:
       return PAGE_READ | PAGE_WRITE;
-  case 4: case 7: /* Reserved.  */
+  case 4: /* Reserved.  */
       return 0;
   case 5:
       return is_user ? 0 : prot_ro;
   case 6:
       return prot_ro;
+  case 7:
+      if (!arm_feature (env, ARM_FEATURE_V7))
+          return 0;
+      return prot_ro;
   default:
       abort();
   }
@@ -1085,6 +1089,12 @@
     if (xn && access_type == 2)
         goto do_fault;
 
+    /* The simplified model uses AP[0] as an access control bit.  */
+    if ((env->cp15.c1_sys & (1 << 29)) && (ap & 1) == 0) {
+        /* Access flag fault.  */
+        code = (code == 15) ? 6 : 3;
+        goto do_fault;
+    }
     *prot = check_ap(env, ap, domain, access_type, is_user);
     if (!*prot) {
         /* Access permission fault.  */