| GPIOSIM(4) | Device Drivers Manual | GPIOSIM(4) | 
gpiosim —
pseudo-device gpiosim
gpiosim pseudo-device simulates a 64-bit wide
  gpio(4) device. The state of the
  simulated device can be manipulated through the
  sysctl(8) interface. For this
  purpose, access the "hw.gpiosim<N>.value"
  sysctl(8) variable, where
  "<N>" denotes the number of the
  gpiosim instance.
gpiosim driver was written by Marc
  Balmer
  <marc@msys.ch>.
| May 20, 2013 | NetBSD 9.4 |