These patches extract and enhance the bitfield support in the register macro
and introduces a new macro called bitstruct which allows to define Rust
structures with bitfields. This is extremely useful as it allows clean Rust
structure definitions without requiring explicit masks and shifts.

See [1] for an example of code I am working on.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git/patch/?id=76797b31facae8f1a1be139412c78568df1da9f3

v1 of the patches is at:
https://lore.kernel.org/all/20250824135954.2243774-1-joelagnelf@nvidia.com/

v1->v2:
* Use build_assert in bitstruct
* Split move and enhance patches for easier review
* Move out of Nova into kernel crate for other drivers like Tyr which will use.
* Miscellaneous cosmetic improvements.

Joel Fernandes (4):
  nova-core: bitstruct: Move bitfield-specific code from register! into
    new macro
  nova-core: bitstruct: Add support for different storage widths
  nova-core: bitstruct: Add support for custom visiblity
  rust: Move register and bitstruct macros out of Nova

 drivers/gpu/nova-core/falcon.rs               |   2 +-
 drivers/gpu/nova-core/falcon/gsp.rs           |   3 +-
 drivers/gpu/nova-core/falcon/sec2.rs          |   2 +-
 drivers/gpu/nova-core/regs.rs                 |   5 +-
 rust/kernel/bitstruct.rs                      | 281 +++++++++++++++
 rust/kernel/lib.rs                            |   2 +
 rust/kernel/prelude.rs                        |   2 +
 .../regs/macros.rs => rust/kernel/register.rs | 339 +++---------------
 8 files changed, 347 insertions(+), 289 deletions(-)
 create mode 100644 rust/kernel/bitstruct.rs
 rename drivers/gpu/nova-core/regs/macros.rs => rust/kernel/register.rs (70%)

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2.34.1