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Describe 'options SPLDEBUG'.

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dyoung 2009-11-17 17:54:14 +00:00
parent 8454e30192
commit d6a7055744
1 changed files with 18 additions and 2 deletions
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20
share/man/man4/options.4
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@ -1,4 +1,4 @@
.\" $NetBSD: options.4,v 1.380 2009/06/24 23:10:02 zafer Exp $
.\" $NetBSD: options.4,v 1.381 2009/11/17 17:54:14 dyoung Exp $
.\"
.\" Copyright (c) 1996
.\" Perry E. Metzger. All rights reserved.
@ -30,7 +30,7 @@
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\"
.Dd April 10, 2009
.Dd November 17, 2009
.Dt OPTIONS 4
.Os
.Sh NAME
@ -1168,6 +1168,22 @@ See
and
.Xr vnconfig 8
for more information.
.It Cd options SPLDEBUG
Help the kernel programmer find bugs related to the interrupt priority
level.
When
.Fn spllower
or
.Fn splraise
changes the current CPU's interrupt priority level to or from
.Dv IPL_HIGH ,
record a backtrace.
Read
.Xr return_address 9
for caveats about collecting backtraces.
This feature is experimental, and it is only available on i386.
See
.Pa sys/kern/subr_spldebug.c .
.It Cd options TFTPROOT
Download the root memory disk through TFTP at root mount time.
This enables the use of a root