More defect fixes, added some error codes

Utilities/VirtualMemory.h

@@ -1,10 +1,20 @@
 #pragma once
 
+// Failure codes for the functions
+enum
+{
+	VM_SUCCESS = 0,
+	VM_FAILURE = -1,
+};
+
 namespace memory_helper
 {
 	/**
 	* Reserve size bytes of virtual memory and returns it.
 	* The memory should be commited before usage.
+	*
+	* Returns the base address of the allocated region of pages, if successful.
+	* Returns (void*)VM_FAILURE, if unsuccessful.
 	*/
 	void* reserve_memory(size_t size);
 
@@ -13,13 +23,16 @@ namespace memory_helper
 	* That is, bake reserved memory with physical memory.
 	* pointer should belong to a range of reserved memory.
 	*
-	* Returns 0, if was successful.
-	* Returns -1, if was unsuccessful.
+	* Returns VM_SUCCESS, if successful.
+	* Returns VM_FAILURE, if unsuccessful.
 	*/
 	s32 commit_page_memory(void* pointer, size_t page_size);
 
 	/**
 	* Free memory alloced via reserve_memory.
+	*
+	* Returns VM_SUCCESS, if successful.
+	* Returns VM_FAILURE, if unsuccessful.
 	*/
-	void free_reserved_memory(void* pointer, size_t size);
+	s32 free_reserved_memory(void* pointer, size_t size);
 }