209         len: usize,  in mmap()
241             len,  in mmap()
346     pub fn munmap(start_vaddr: VirtAddr, len: usize) -> Result<usize, SystemError> {  in munmap()
348         assert!(check_aligned(len, MMArch::PAGE_SIZE));  in munmap()
350         if unlikely(verify_area(start_vaddr, len).is_err()) {  in munmap()
353         if unlikely(len == 0) {  in munmap()
359         let page_count = PageFrameCount::new(len / MMArch::PAGE_SIZE);  in munmap()
378         len: usize,  in mprotect()
382         assert!(check_aligned(len, MMArch::PAGE_SIZE));  in mprotect()
384         if unlikely(verify_area(start_vaddr, len).is_err()) {  in mprotect()
387         if unlikely(len == 0) {  in mprotect()
395         let page_count = PageFrameCount::new(len / MMArch::PAGE_SIZE);  in mprotect()