asmc_mmio_key_read
return (asmc_mmio_key_read(dev, key, buf, len));
error = asmc_mmio_key_read(dev, ASMC_KEY_LDKN, &ldkn, 1);
error = asmc_mmio_key_read(dev, ASMC_KEY_BCLM, &bclm, 1);
int asmc_mmio_key_read(device_t dev, const char *key,