Binary compatibility with Harmonica.

src/include/help.h

@@ -17,7 +17,9 @@ namespace HarpTools {
       "  Display contextual help.\n",
       *emuHelp = "HARP Emulator command line arguments:\n"
                   "  -c, --core <filename>    RAM image\n"
-                  "  -a, --arch <arch string> Architecture string\n",
+                  "  -a, --arch <arch string> Architecture string\n"
+                  "  -s, --stats              Print stats on exit.\n"
+                  "  -b, --basic              Disable virtual memory.\n",
       *asmHelp = "HARP Assembler command line arguments:\n"
                   "  -a, --arch <arch string>\n"
                   "  -o, --output <filename>\n",

src/include/mem.h

@@ -106,10 +106,11 @@ namespace Harp {
 
   class MemoryUnit {
   public:
-    MemoryUnit(Size pageSize, Size addrBytes) : 
-      pageSize(pageSize), addrBytes(addrBytes), ad()
+    MemoryUnit(Size pageSize, Size addrBytes, bool disableVm = false) : 
+      pageSize(pageSize), addrBytes(addrBytes), ad(), disableVm(disableVm)
     {
-      tlb[0] = TLBEntry(0, 077);
+      if (!disableVm)
+        tlb[0] = TLBEntry(0, 077);
     }
     void attach(MemDevice &m, Addr base);
 
@@ -162,6 +163,8 @@ namespace Harp {
     TLBEntry tlbLookup(Addr vAddr, Word flagMask);
 
     Size pageSize, addrBytes;
+
+    bool disableVm;
   };
 };