rust: io: add projection macro and methods

Add an `io_project!()` macro to allow projection from `Io` to a subview of
it, using the pointer projection mechanism to perform compile-time checks.

For cases where type-casting is required, the `try_cast()` function may be
used where the size and alignment checks are performed at runtime.

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Link: https://patch.msgid.link/20260706-io_projection-v6-13-72cd5d055d54@garyguo.net
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

0 files changed, 0 insertions, 0 deletions