pub const WRITE_MASK: [u64; 32];Expand description
Per-register writable-bit masks. A 0 bit is hardwired, reserved, or
hardware-owned, and a write to it is discarded.
Every entry is a direct transcription of a register figure. Where a register
is entirely read-only the mask is 0, which makes “read-only” the same
mechanism as “reserved bit” rather than a separate code path.