grfsw
struct grfsw grfsw[] = {
int ngrfsw = sizeof(grfsw) / sizeof(grfsw[0]);
struct grfsw *gsw;
gsw = &grfsw[cfaddr];
if (gsw < &grfsw[ngrfsw] && (*gsw->gd_init)(gp, addr)) {
extern struct grfsw grfsw[];
struct grfsw *g_sw; /* static configuration info */