user space can driver real-time - SERP Analysis

https://www.osadl.org/fileadmin/dam/rtlws/12/Koch.pdf

https://unix.stackexchange.com/questions/42980/can-hardware-be-accessed-directly-from-user-space

https://www.reddit.com/r/osdev/comments/1gc4kt3/do_drivers_really_need_to_run_in_kernel_mode/

https://stackoverflow.com/questions/26506375/difference-between-user-space-driver-and-kernel-driver

https://www.embedded.com/device-drivers-in-user-space/

https://prashant-divate.medium.com/linux-1-0-when-to-write-a-kernel-driver-vs-a-user-space-application-a-practical-guide-ed55c8c211d5

https://forums.ni.com/t5/LabWindows-CVI/How-to-create-a-Kernel-Space-driver/td-p/3634776

https://sourceforge.net/projects/rtusd/

https://askubuntu.com/questions/79130/interacting-with-a-linux-input-kernel-driver-from-userspace

https://www.ituonline.com/tech-definitions/what-is-a-user-space-driver/