Expose ergonomic move between usize and capability types
There is currently no ergonomic means to get the underlying usize out of a capability, or to make a capability out of a usize. This allows the following replacement:
// old usage
let cap_cpy = unsafe { sel4::CNode::from(
sel4::Cap::from_usize(
sel4.CPtr::from_useze(
cap.as_ref().as_cptr().as_usize()
)
)
)};
// new usage
let cap_cpy = unsafe {sel4::CNode::from_usize(cap.as_usize)};
This is not ideal, as it doesn't help the problem of how leverage rust to manage capabilities safely, but in the meantime, it provides the same functionality in a more usable way.