Dmitry Konyshev wrote: > Could anyone please tell me if there's any way to find out which > device the system booted from in a user application. The loader > sets loaddev and currdev vars, but I see no way to transfer them to > the user environment.
Luigi Rizzo posted patches to communicate this information from the loader to sysctl space. Note that it's not definitive, since you don't get a sure mapping between BIOS devices and protected mode OS device drivers (for obvious reasons). One way to obtain this information is to write a program that uses vm86() calls to read the first N sectors of a BIOS disk, then read the same area using the protected mode drivers. When you get a unique MD5 hash match between the BIOS and the boot device, you're there. For CDROM boots, where the floppy image is in a RAM disk that is wedged into the BIOS calls to replace the floppy, after the boot, the BIOS wedge is destroyed, so that's lost. I guess you could infer this one, if you got no MD5 matches. Good luck with the code; normally, wanting to know this information comes with a bad reason for the desire. 8-). -- Terry To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
