Kernel Modules Documentation?

Walter Hurry walterhurry at
Wed May 1 19:14:34 UTC 2013

On Tue, 30 Apr 2013 10:07:13 -0400, illoai at wrote:

> On 30 April 2013 09:39, Walter Hurry <walterhurry at> wrote:
>> FreeBSD 9.1 on amd64.
>> I have a list of about 220 kernel modules and would like to find out
>> what they do, or are for (none has a man page). I suspect that many of
>> them are drivers for particular devices.
>> Is there any resource or documentation available?
>> Thanks.
>> P.S. Here are the first few:
>> ahc_eisa ahc_isa ahc_pci alias_cuseeme
> Yes, the modules names aren't always exactly the man page name. 
> Stubborn & inventive use of apropos & locate (& reading through stuff in
> /usr/src/sys/modules/ ) can help, but not everything is obvious.
> ahc(4) covers the first few.
> libalias(3) appears to be the only thing to even parenthetically
> mentions cuseeme (NB I didn't run grep over the whole dang filesystem,
> though).
> Most of the if_something are under something(4).
> For the geom_blahblah, see if it's covered by something mentioned in the
> SEE ALSO sexion of geom(8) or geom(4).

Thanks to all for the pointers. With a little digging around, I have 
managed to reduce the 220 to zero, and now have all 643 (9.1 on amd64) 
briefly documented.

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