init: init nachos hw01, should pass jenkins os_group_20_hw job but fail on os_group_20_ta job

code/userprog/addrspace.h

@@ -0,0 +1,53 @@
+// addrspace.h 
+//	Data structures to keep track of executing user programs 
+//	(address spaces).
+//
+//	For now, we don't keep any information about address spaces.
+//	The user level CPU state is saved and restored in the thread
+//	executing the user program (see thread.h).
+//
+// Copyright (c) 1992-1996 The Regents of the University of California.
+// All rights reserved.  See copyright.h for copyright notice and limitation 
+// of liability and disclaimer of warranty provisions.
+
+#ifndef ADDRSPACE_H
+#define ADDRSPACE_H
+
+#include "copyright.h"
+#include "filesys.h"
+
+#define UserStackSize		1024 	// increase this as necessary!
+
+class AddrSpace {
+  public:
+    AddrSpace();			// Create an address space.
+    ~AddrSpace();			// De-allocate an address space
+
+    bool Load(char *fileName);		// Load a program into addr space from
+                                        // a file
+					// return false if not found
+
+    void Execute(char *fileName);             	// Run a program
+					// assumes the program has already
+                                        // been loaded
+
+    void SaveState();			// Save/restore address space-specific
+    void RestoreState();		// info on a context switch 
+
+    // Translate virtual address _vaddr_
+    // to physical address _paddr_. _mode_
+    // is 0 for Read, 1 for Write.
+    ExceptionType Translate(unsigned int vaddr, unsigned int *paddr, int mode);
+
+  private:
+    TranslationEntry *pageTable;	// Assume linear page table translation
+					// for now!
+    unsigned int numPages;		// Number of pages in the virtual 
+					// address space
+
+    void InitRegisters();		// Initialize user-level CPU registers,
+					// before jumping to user code
+
+};
+
+#endif // ADDRSPACE_H