Re: [PATCH v2 03/16] rust: io: support register projections

[Gary Guo]

On Mon Aug 10, 2026 at 10:30 AM BST, Alexandre Courbot wrote:
> On Thu Aug 6, 2026 at 1:35 AM JST, Gary Guo wrote:
>> `IoLoc`s themselves just describe a projection from a region to a concrete
>> register. Thus, support it in `io_project` macro too. Also, update methods
>> that operate on `IoLoc` to use I/O projection.
>>
>> Documentation of `io_project!` is not expanded yet as the example works
>> better when `register!` type can specify base type. `io_read!` and
>> `io_write!` gains the ability to operate on registers as corollary of the
>> capability of `io_project!`. Examples are not added because `read` and
>> `write` is still preferrably used instead.
>>
>> Signed-off-by: Gary Guo <gary@xxxxxxxxxxx>
>> ---
>>  rust/kernel/io.rs | 58 ++++++++++++++++++++++++++++++++++++++++++++-----------
>>  1 file changed, 47 insertions(+), 11 deletions(-)
>>
>> [snip]
>>
>> +
>> +    #[inline(always)]
>> +    pub fn try_project_loc<U, L>(
>
> nit: missing documentation

This is intentional as it's part of a `#[doc(hidden)]` type. The user-facing
documentation is added in the subsequent commit as this cannot yet be used
without specifying base type in `register!`.

>
>> +        self,
>> +        location: L,
>> +    ) -> Result<<T::Backend as IoBackend>::View<'a, U>>
>> +    where
>> +        L: IoLoc<T::Target, U>,
>> +    {
>> +        io_view::<_, U>(self.0, location.offset())
>> +    }
>> +
>> +    #[inline(always)]
>> +    pub fn project_loc<U, L>(self, location: L) -> <T::Backend as IoBackend>::View<'a, U>
>
> ditto.