#[derive(Copy, Clone)]
#[repr(C)]
pub struct TaskContext {
    ra: usize,
    sp: usize,
    s: [usize; 12],
}

impl TaskContext {
    pub fn new() -> Self {
        Self {
            ra: 0,
            sp: 0,
            s: [0; 12],
        }
    }

    /// set the task context { __restore function, kernel stack, s_0 -> s_12 }
    pub fn goto_restore(kernel_stack_pointer: usize) -> Self {
        extern "C" {
            fn __restore();
        }

        Self {
            ra: __restore as usize,
            sp: kernel_stack_pointer,
            s: [0; 12],
        }
    }
}