pte_t FUNCTION( unsigned int page) \{ unsigned int vpn; unsigned int dir; pde_t *pde; (...) Complete the C function to map a page number to its page table entry \& return that entry's address. (For Reference): (virtual addresses are 32-bit) Physical address structure: 0-11: page offset 12-31: page number 12-21: page table 22-31: page directory Structs pte: unsigned int: is_frame_in_use, ref, dirty, op, frame, page \} pte_t pde: pte_t * ptepage; pde_t