[add] laos using xv6-riscv thought

labus/device.cc

@@ -1 +1,5 @@
-#include <device.hh>
+#include <device.hh>
+
+Device::Device(bool cacheable): cacheable_(cacheable) {}
+
+bool Device::is_cacheable() { return cacheable_; }

labus/include/device.hh

@@ -3,9 +3,15 @@
 #include <cstdint>
 #include <cstdlib>
 
+
 class Device {
+protected:
+  bool cacheable_ = false;
+
 public:
-  Device() = default;
+  Device(bool cacheable);
+
+  bool is_cacheable();
 
   virtual const size_t &size() const = 0;
 
@@ -29,7 +35,9 @@ public:
 
 template <typename T>
 class WRDevice : public Device{
+protected:
   size_t devsiz;
+
 public:
   WRDevice(size_t siz);
 

labus/include/sysbus.hh

@@ -7,7 +7,7 @@
 #include <device.hh>
 
 class SystemBus {
-  std::map<uint64_t, Device *> iomap;
+  std::map<uint64_t, Device *> iomap_;
 
   std::pair<const uint64_t, Device *> &finddev(uint64_t addr);
 

labus/sysbus.cc

@@ -3,8 +3,8 @@
 
 std::pair<const uint64_t, Device *> &SystemBus::finddev(uint64_t addr) {
   Device *dev = nullptr;
-  auto &&iter = iomap.upper_bound(addr);
-  if (iter == iomap.begin())
+  auto &&iter = iomap_.upper_bound(addr);
+  if (iter == iomap_.begin())
     panic("device not found");
   iter--;
   if (iter->first <= addr && iter->first + iter->second->size() > addr)
@@ -13,7 +13,7 @@ std::pair<const uint64_t, Device *> &SystemBus::finddev(uint64_t addr) {
   return *iter;
 }
 
-void SystemBus::regdev(Device *dev, uint64_t addr) { iomap.emplace(addr, dev); }
+void SystemBus::regdev(Device *dev, uint64_t addr) { iomap_.emplace(addr, dev); }
 
 void SystemBus::write(char *buf, size_t addr, size_t len) {
   auto &&dev = finddev(addr);