You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: dma.rs
    path of file: ./repos/phaser/phaser/vendor/redox_syscall/src/io
    
    the code of the file until where you have to start completion: use core::mem::{self, MaybeUninit};
use core::ops::{Deref, DerefMut};
use core::{ptr, slice};

use crate::Result;
use crate::{PartialAllocStrategy, PhysallocFlags};

/// An RAII guard of a physical memory allocatio
    
    pub fn from_physbox_uninit(phys: PhysBox) -> Result<Dma<MaybeUninit<T>>> {
        let virt = unsafe { crate::physmap(phys.address, phys.size, crate::PHYSMAP_WRITE)? } as *mut MaybeUninit<T>;

        Ok(Dma {
            phys,
            virt,
        })
    }