Macro kernel::memory_mapped_register

macro_rules! memory_mapped_register {
    { $name:ident($bits:ty) } => { ... };
    { $name:ident($bits:ty), r } => { ... };
    { $name:ident($bits:ty), w } => { ... };
    { $name:ident($bits:ty), wi=$initial:literal } => { ... };
    { $name:ident($bits:ty), rw } => { ... };
    { $name:ident($bits:ty), rwi=$initial:literal } => { ... };
}