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11a4784f90
Add an enum as sum type for `Mmio` and `SysMem`. This serves similar purpose of `iosys_map`. Thanks to Rust's type system, all of projection and struct read/write can be handled by the generic I/O projection mechanism (i.e. `io_project!`, `io_read!, `io_write!`) for free, and there is no need to provide things like `iosys_map_rd_field` or `iosys_map_wr_field`. An enum type also makes it very easy to construct or destruct. This could be made more generic by implementing on a general purpose sum type like `Either`; however this is kept specific unless a need arises that warrants this to be generic over other I/O backends. Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Gary Guo <gary@garyguo.net> Link: https://patch.msgid.link/20260706-io_projection-v6-20-72cd5d055d54@garyguo.net Signed-off-by: Danilo Krummrich <dakr@kernel.org>