On Fri, Jul 19, 2024 at 09:59:37PM +0200, Rudolf Marek wrote: > I would suggest to simply run the BIOS code of this interface in usermode. Sort of similar to VM86 VESA stuff. > Last time I looked into this it used STI/CLI/RDMSR/WRMSR and couple of I/O ports and cf8/cfc for PCI. I took a look at uvesafb (which appears to be what you were talking about) and it looks like it starts a separate executable and uses some IPC to talk to it. Is that the best way to do it? I guess it would look something like: - driver gets loaded - driver spawns /sbin/cgeb-helper - driver uses cn_netlink_send to send the `high_desc` to helper Then the calls to `board->entry` in the driver get replaced with `cn_netlink_send` with a `cgeb_fps`. When the userspace helper gets the message with the `cgeb_fps`, it calls into the bios code and replies to the driver with send() and passes back cgeb_fps.
