Struct MigrationFrame 

#[repr(C, align(64))]
pub struct MigrationFrame {
    pub src_ctx: N3MinimalContext,
    pub dst_ctx: N3MinimalContext,
    pub state: AtomicU8,
    _pad_state: [u8; 3],
    pub generation: AtomicU32,
    pub msg_len: u16,
    pub flags: u16,
    _pad_flags: [u8; 4],
    pub tsc_start: AtomicU64,
    pub owner_tid: AtomicU64,
    pub _pad: [u8; 32],
}

Shared migration frame : one per N3 transport endpoint pair.

Must reside in a dedicated physical page mapped at the same kernel virtual address (N3_SHARED_FRAME_VA) in both sender and receiver address spaces. The mapping is kernel-only (no USER_ACCESSIBLE flag) : all access is controlled by the kernel via the CAS state machine. Both address spaces see the same physical page through their own kernel half of the page tables.

Fields

src_ctx: N3MinimalContext

Sender context (saved by ASM primitive).

dst_ctx: N3MinimalContext

Receiver context (prepared by kernel before migration).

state: AtomicU8

Atomic state: MigrationState.

_pad_state: [u8; 3]

generation: AtomicU32

Monotonically increasing migration counter.

msg_len: u16

Message length in bytes.

flags: u16

Migration flags.

_pad_flags: [u8; 4]

tsc_start: AtomicU64

TSC snapshot at migration start (for watchdog).

owner_tid: AtomicU64

Thread ID of the frame owner.

_pad: [u8; 32]

Reserved padding for future use and cache-line alignment.