prom_open
ret.bits = prom_open(booted_dev_name, devlen);
int (*prom_open)(char *, int, ...);
int prom_open(const char *, ...);
i = prom_open(device, 0);
int prom_open(const char *, int);
sc_fd = prom_open(device, 0);
i = prom_open(device, 0);
fd = prom_open(path);
fd = prom_open(prom_bootdevice);
handle = prom_open(fname);
if ((handle = prom_open(fname)) == -1) {
if ((handle = prom_open(fname)) == -1) {