diff --git a/prototypes/base/include/multiboot.hpp b/prototypes/base/include/multiboot.hpp
index 10121f4..d476f5e 100644
--- a/prototypes/base/include/multiboot.hpp
+++ b/prototypes/base/include/multiboot.hpp
@@ -52,6 +52,12 @@ namespace multiboot
       uint64_t base;
       uint64_t length;
       uint32_t type;
+      
+      
+      bool isFree() const {
+        return this->type == 1;
+      }
+      
   } __attribute__((packed));
 
   MB_ASSERT_SIZE(MemoryMap, 24);
@@ -62,6 +68,11 @@ namespace multiboot
       physical_t end;
       const char * name;
       uint32_t reserved;
+      
+      uint32_t size() const {
+        return this->end.numeric() - this->start.numeric();
+      }
+      
   } __attribute__((packed));
 
   MB_ASSERT_SIZE(Module, 16);
diff --git a/prototypes/base/init.cpp b/prototypes/base/init.cpp
index 3aca0a6..e8bcb62 100644
--- a/prototypes/base/init.cpp
+++ b/prototypes/base/init.cpp
@@ -9,7 +9,7 @@
 
 using namespace multiboot;
 
-extern "C" void init(Structure const * data)
+extern "C" void init(Structure const & data)
 {
 	Console::main
 		<< "Hello World!\n"
@@ -18,14 +18,21 @@ extern "C" void init(Structure const * data)
 		<< "Hello default color.\n";
   
   Console::main
-    << "multiboot structure: 0x" << data << "\n"
-    << "bootloader name:     " << data->bootLoaderName << "\n"
-    << "command line:        " << data->commandline << "\n"
-    << "count of modules:    " << data->modules.length << "\n";
-  
-  for(const Module &module : data->modules) {
+    << "bootloader name:  " << data.bootLoaderName << "\n"
+    << "command line:     " << data.commandline << "\n"
+    << "count of modules: " << data.modules.length << "\n"
+    << "count of mmaps:   " << data.memoryMaps.length << "\n";
+  for(auto &mmap : data.memoryMaps) {
+    if(mmap.length == 0) {
+      continue;
+    }
     Console::main
-      << "Module " << module.name << "\n";
+      << "mmap: "
+      << (uint32_t)mmap.base << "+" << (uint32_t)mmap.length
+      << ", " << mmap.entry_size
+      << ", " << sizeof(mmap)
+      << ",  free:" << mmap.isFree()
+      << "\n";
   }
   
   /*