pub fn new_zero() -> Option<Self> {
        Self::new().map(|mut f| {
            f.zero();
            f
        })
    }
/// Allocate one physical frame and fill with zero.
Allocate one physical frame and fill with zero.
Allocate one physical frame and fill with zero .
pub fn new_zero() -> Option<Self> {
        Self::new().map(|mut f| {
            f.zero();
            f
        })
    }
pub fn new_zero ( ) -> Option < Self > { Self :: new ( ) . map ( | mut f | { f . zero ( ) ; f } ) }
Allocate one physical frame and fill with zero.
Allocate one physical frame and fill with zero .