Date: Sun, 10 Mar 2002 12:08:44 -0800 (PST) From: Luigi Rizzo <luigi@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/i386/i386 autoconf.c machdep.c src/sbin/sysctl sysctl.c Message-ID: <200203102008.g2AK8ic50180@freefall.freebsd.org>
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luigi 2002/03/10 12:08:44 PST
Modified files:
sys/i386/i386 autoconf.c machdep.c
sbin/sysctl sysctl.c
Log:
Export a (machine dependent) kernel variable bootdev as
machdep.guessed_bootdev, and add code to sysctl to parse its value
and give a (not necessarily correct) name to the device we booted
from (the main motivation for this code is to use the info in the
PicoBSD boot scripts, and the impact on the kernel is minimal).
NOTE: the information available in bootdev is not always reliable,
so you should not trust it too much. The parsing code is the same
as in boot2.c, and cannot cover all cases -- as it is, it seems to
work fine with floppies and IDE disks recognised by the BIOS. It
_should_ work as well with SCSI disks recognised by the BIOS.
Booting from a CDROM in floppy emulation will return /dev/fd0 (because
this is what the BIOS tells us).
Booting off the network (e.g. with etherboot) leaves bootdev unset so
the value will be printed as "invalid (0xffffffff)".
Finally, this feature might go away at some point, hopefully when we
have a more reliable way to get the same information.
MFC-after: 5 days
Revision Changes Path
1.42 +51 -0 src/sbin/sysctl/sysctl.c
1.162 +0 -2 src/sys/i386/i386/autoconf.c
1.502 +4 -0 src/sys/i386/i386/machdep.c
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