Re: [RFC PATCH 10/11] rust: add basic abstractions for iomem operations

[Wedson Almeida Filho]

On Mon, 20 May 2024 at 23:07, Dave Airlie <airlied@xxxxxxxxx> wrote:
>
> >
> > Wedson wrote a similar abstraction in the past
> > (`rust/kernel/io_mem.rs` in the old `rust` branch), with a
> > compile-time `SIZE` -- it is probably worth taking a look.
> >
>
> Just on this point, we can't know in advance what size the IO BARs are
> at compile time.
>
> The old method just isn't useful for real devices with runtime IO BAR sizes.

The compile-time `SIZE` in my implementation is a minimum size.

Attempts to read/write with constants within that size (offset + size)
were checked at compile time, that is, they would have zero additional
runtime cost when compared to C. Reads/writes beyond the minimum would
have to be checked at runtime.