Function access_user_memory

core/src/mm.rs:353–363

Enables scoped access into user memory, allowing page faults to occur inside kernel.

(f: impl FnOnce() -> R)

/// Enables scoped access into user memory, allowing page faults to occur inside
/// kernel.
pub fn access_user_memory<R>(f: impl FnOnce() -> R) -> R {
    let curr = current();
    let Some(thr) = curr.try_as_thread() else {
        panic!("access_user_memory called outside of thread context");
    };

    thr.set_accessing_user_memory(true);
    let result = f();
    thr.set_accessing_user_memory(false);
    result
}

#[allow(dead_code)]
struct Vm(IrqSave);