[Add] software simulator add

lasim/main.cc

@@ -1,11 +1,38 @@
-#include <sysbus.hh>
-
 #include <iostream>
 
-int main() {
-    fetch();
-#ifdef DEBUG_MODE
-    std::cout << "Hello" << std::endl;
-#endif
+#include <sysbus.hh>
+#include <memory.hh>
+#include <serial.hh>
+#include <la32r.hh>
+#include <common.h>
+#include <devaddr.h>
+
+int main(int argc, char *argv[]) {
+  if (argc < 2) {
+    std::cout << "Usage: sim <bin>";
     return 0;
+  }
+
+  SystemBus bus;
+  Memory ram(2 * 1024 * 1024);
+  Memory stk(256 * 1024);
+
+  Memory flash(1024 * 1024);
+  flash.load(argv[1]);
+  ram.load(&flash, IMG_ADDR, flash.size());
+
+  bus.regdev(&ram,  RAM_ADDR);
+  bus.regdev(&stk,  STK_ADDR);
+
+  Serial bios(1);
+  bus.regdev(&bios, SERIAL_PORT);
+
+  auto cpu = new LA32R(&bus);
+
+  while (true) {
+    cpu->Step(1);
+  }
+
+  delete cpu;
+  return 0;
 }