rust: io: implement IoSysMap

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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>

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Gary Guo 2026-07-06 13:44:33 +01:00 • committed by Danilo Krummrich

parent e7219e53c5

commit 11a4784f90

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rust/kernel/io.rs

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