addrspace.h

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// 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();                     // 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

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