1 files changed, 30 insertions, 5 deletions

diff --git a/riscv/devices.h b/riscv/devices.h
index 64ab79b..e4df6c9 100644
--- a/riscv/devices.h
+++ b/riscv/devices.h
@@ -22,6 +22,8 @@ class bus_t : public abstract_device_t {
   bool store(reg_t addr, size_t len, const uint8_t* bytes);
   void add_device(reg_t addr, abstract_device_t* dev);
 
+  std::pair<reg_t, abstract_device_t*> find_device(reg_t addr);
+
  private:
   std::map<reg_t, abstract_device_t*> devices;
 };
@@ -36,17 +38,40 @@ class rom_device_t : public abstract_device_t {
   std::vector<char> data;
 };
 
-class rtc_t : public abstract_device_t {
+class mem_t : public abstract_device_t {
+ public:
+  mem_t(size_t size) : len(size) {
+    data = (char*)calloc(1, size);
+    if (!data)
+      throw std::runtime_error("couldn't allocate " + std::to_string(size) + " bytes of target memory");
+  }
+  mem_t(const mem_t& that) = delete;
+  ~mem_t() { free(data); }
+
+  bool load(reg_t addr, size_t len, uint8_t* bytes) { return false; }
+  bool store(reg_t addr, size_t len, const uint8_t* bytes) { return false; }
+  char* contents() { return data; }
+  size_t size() { return len; }
+
+ private:
+  char* data;
+  size_t len;
+};
+
+class clint_t : public abstract_device_t {
  public:
-  rtc_t(std::vector<processor_t*>&);
+  clint_t(std::vector<processor_t*>&);
   bool load(reg_t addr, size_t len, uint8_t* bytes);
   bool store(reg_t addr, size_t len, const uint8_t* bytes);
-  size_t size() { return regs.size() * sizeof(regs[0]); }
+  size_t size() { return CLINT_SIZE; }
   void increment(reg_t inc);
  private:
+  typedef uint64_t mtime_t;
+  typedef uint64_t mtimecmp_t;
+  typedef uint32_t msip_t;
   std::vector<processor_t*>& procs;
-  std::vector<uint64_t> regs;
-  uint64_t time() { return regs[0]; }
+  mtime_t mtime;
+  std::vector<mtimecmp_t> mtimecmp;
 };
 
 #endif