120         len: usize,  in mmap()
152             len,  in mmap()
170     pub fn munmap(start_vaddr: VirtAddr, len: usize) -> Result<usize, SystemError> {  in munmap()
172         assert!(check_aligned(len, MMArch::PAGE_SIZE));  in munmap()
174         if unlikely(verify_area(start_vaddr, len).is_err()) {  in munmap()
177         if unlikely(len == 0) {  in munmap()
183         let page_count = PageFrameCount::new(len / MMArch::PAGE_SIZE);  in munmap()
201         len: usize,  in mprotect()
205         assert!(check_aligned(len, MMArch::PAGE_SIZE));  in mprotect()
207         if unlikely(verify_area(start_vaddr, len).is_err()) {  in mprotect()
210         if unlikely(len == 0) {  in mprotect()
218         let page_count = PageFrameCount::new(len / MMArch::PAGE_SIZE);  in mprotect()