This allows a single PCI daemon to run on the whole system, prevents
multiple drivers from claiming the same PCI device and makes it possible
for userspace to enumerate all available PCI devices. In the future this
will enable an lspci tool, possibly PCIe hot plugging and more.
Co-Authored-By: 4lDO2 <4lDO2@protonmail.com>
Currently pcid exits the main thread once it is done spawning drivers
and expects all background threads handling driver communication to stay
around. This only works as exitting the main thread on redox os
currently doesn't cause the whole process to die. This will have to be
fixed at some point for compatibility with programs that expect that
exitting the main thread kills all other threads in the process, at
which point pcid would break without the changes in this commit.
This makes them harder to accidentally run them from the shell, which
would not work. In the future this may also allow embedding the driver
config in the driver executable itself without having to look at all
non-driver executables too.
Devices should never change the feature status behind the back of the
driver, so storing the current status after setting it is fine. Drivers
should reset all state when they start to recover from a crashed driver,
so they shouldn't need to get the current feature status at startup
either.
bjorn3