Add memorySize() method to StartupInformation

src/StartupInformation.cc

@@ -21,4 +21,12 @@ StartupInformation::kernelSize()
     return kernelEnd - kernelStart;
 }
 
+u32
+StartupInformation::memorySize()
+    const
+{
+    // Memory is 1 MiB plus however much upper memory we have.
+    return 1024 * 1024 + multibootInformation->upperMemoryKB() * 1024;
+}
+
 } /* namespace kernel */

src/StartupInformation.hh

@@ -38,6 +38,9 @@ struct StartupInformation
 
     /** Size of the kernel image in bytes. */
     u32 kernelSize() const;
+
+    /** Size of memory in bytes. */
+    u32 memorySize() const;
 };
 
 } /* namespace kernel */