kDeviceCount
return (index >= 0 && index < kDeviceCount);
for (i = 0; i < kDeviceCount; i++) {
info.unused = (index != kDeviceCount - 1);
for (int32 i = 0; i < kDeviceCount; i++)
#define kDataDeviceCount (kDeviceCount - 1)
#define kControlDevice (kDeviceCount - 1)
struct device_info gDeviceInfos[kDeviceCount];