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make test-user

A: Ownership prevents use-after-free and double-free, traits enable zero-cost abstractions. rcore documentation

Assuming is an educational OS/kernel written in Rust, here is the documentation content: let frame = frame_alloc().unwrap()

use rcore_mem::frame_alloc; let frame = frame_alloc().unwrap(); page_table.map(page, frame, Flags::READ | Flags::WRITE); Flags::READ | Flags::WRITE)

| Subsystem | Crate | Responsibility | |-----------|-------------|------------------------------| | boot | rcore_boot | Early init, trap vector | | memory | rcore_mem | Paging, frame allocator | | process | rcore_proc | PCB, scheduler, syscalls | | fs | rcore_fs | Simple FS, block I/O | | driver | rcore_drv | UART, PLIC, virtio devices |