Swap implementation for Lab4 now made available.

src/vm/swap.h

+#ifndef VM_SWAP_H
+#define VM_SWAP_H
+
+#include <stdio.h>
+
+void swap_init(void);
+size_t swap_out(const void* kpage);
+bool swap_in(size_t block_index, void* kpage);
+void swap_free(size_t block_index);
+void swap_destroy(void);
+
+#endif /* VM_SWAP_H */