amr_mailbox
((struct amr_mailbox *)&(ac->mailbox))->mb_param = 0;
struct amr_mailbox *mbox, mbsave;
sizeof (struct amr_mailbox) + 16,
(struct amr_mailbox *)(((uintptr_t)softs->mbox) + move);
#define AMR_MBOX_CMDSIZE (size_t)(&((struct amr_mailbox *)(NULL))->mb_nstatus)
struct amr_mailbox mailbox;
struct amr_mailbox *mailbox;