Ytshih/hw2

code/userprog/addrspace.h

@@ -18,6 +18,28 @@
 
 #define UserStackSize		1024 	// increase this as necessary!
 
+class FrameTable {
+  public:
+    FrameTable();
+    ~FrameTable();
+
+    int Allocate();
+    void Release(int phyPageNum);
+    size_t RemainSize();
+
+  private:
+    struct Node {
+      Node *next;
+      int idx;
+      Node(int idx = -1);
+    };
+
+    Node *begin, *end;
+
+    size_t available;
+    int *useCount;
+};
+
 class AddrSpace {
   public:
     AddrSpace();			// Create an address space.
@@ -40,8 +62,7 @@ class AddrSpace {
     ExceptionType Translate(unsigned int vaddr, unsigned int *paddr, int mode);
 
   private:
-    TranslationEntry *pageTable;	// Assume linear page table translation
-					// for now!
+    TranslationEntry *pageTable;
     unsigned int numPages;		// Number of pages in the virtual 
 					// address space