nccb
struct nccb;
typedef struct nccb * nccb_p;
vdsp_off = offsetof(struct nccb, patch[0]);
vdsp_off = offsetof(struct nccb, patch[4]);
cp = kmalloc (sizeof (struct nccb), M_DEVBUF, M_WAITOK | M_ZERO);
#define CCB_PHYS(cp,lbl) (cp->p_nccb + offsetof(struct nccb, lbl))