[Add] software simulator add

labus/memory.cc

@@ -0,0 +1,40 @@
+#include <memory.hh>
+#include <common.h>
+
+Memory::Memory(size_t siz, bool w, bool r, bool x)
+    : WRDevice(siz), wen(w), ren(r), xen(x) {
+  data = new char[siz];
+  memset((void *)data, 0, siz);
+}
+
+Memory::~Memory() {
+  if (data) {
+    delete [] data;
+  }
+}
+
+void Memory::load(const char *path) {
+  std::fstream ifs(path, std::ios::in | std::ios::binary);
+  panicifnot(ifs);
+  ifs.read(data, this->size());
+  ifs.close();
+}
+
+void Memory::load(Memory *mem, size_t addr, size_t len) {
+  panicifnot(addr + len < this->size());
+  memcpy(&data[addr], mem->data, len);
+}
+
+void Memory::write(char *buf, size_t addr, size_t len) {
+  if (!wen)
+    panic("permission denied");
+  size_t actlen = addr + len >= this->size() ? this->size() - addr : len;
+  memcpy(&data[addr], buf, actlen);
+}
+
+void Memory::read(char *buf, size_t addr, size_t len) {
+  if (!ren)
+    panic("permission denied");
+  size_t actlen = addr + len >= this->size() ? this->size() - addr : len;
+  memcpy(buf, &data[addr], actlen);
+}