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