Linux (via /sys/bus/pci, /proc/bus/pci or i386 ports)
FreeBSD (via /dev/pci)
NetBSD (via libpci)
- OpenBSD (via /dev/pci)
+ OpenBSD (via /dev/pci or i386 ports)
GNU/kFreeBSD (via /dev/pci)
Solaris/i386 (direct port access)
Aix (via /dev/pci and odmget)