Date: Mon, 13 May 2002 00:46:36 -0700 From: Peter Wemm <peter@wemm.org> To: Terry Lambert <tlambert2@mindspring.com> Cc: Jake Burkholder <jake@locore.ca>, Dmitry Mottl <dima@sinp.msu.ru>, freebsd-hackers@FreeBSD.ORG Subject: Re: question: hacking init_main.c Message-ID: <20020513074636.D7D5A3811@overcee.wemm.org> In-Reply-To: <3CDF4FA5.8511B01A@mindspring.com>
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Terry Lambert wrote:
> Jake Burkholder wrote:
> > Wrong, no cookie. kernel printf uses the low level console which is
> > initialized by cninit, which is called from init386 (etc), before
> > mi_startup.
> >
> > My best guess at what's happening is that the subsystem numbers are
> > "sparse", and have high numerical values, so you can't really index
> > an array with them. ie you're trying to print sysinit_descr[0x1000000]
> > etc. The best way I've found to do what you want is to use
> > linker_ddb_search_symbol and linker_ddb_symbol_values on the sysinit
> > function pointer to find its name, and to print the numerical value
> > of the order/subsystem.
> >
> > T TERRY PLZ TO BE RESEARCHING NEXT TIME LUV JAKE
>
> Jake,
>
> *I wrote* init_main.c and kernel.h and the original SYSINIT() code;
> Julian just committed it.
Terry: Just because you wrote parts of it, doesn't mean that you are
right. If you actually read the code, you would know that the console
is initialized **WAY** before sysinit is even started. It may have been
that way once in your version of the code, but it has never been that way
for FreeBSD itself.
> Please see my Copyrights on the files.
>
> You don't want to start using the kernel printf until the console
> code is initialized. Trace through the code, and you will see some
> bogosities that result from n-nserial console, and interaction with
> the dmesg buffer.
I personally have added printfs that show the sysinits running before. I
have done it many times in fact.
note locore.s:
call init386
....
call mi_startup
Now, note machdep.c:
void
init386(first)
{
...
/*
* Initialize the console before we print anything out.
*/
cninit();
if (metadata_missing)
printf("WARNING: loader(8) metadata is missing!\n");
...
}
Console probe/attach is **NOT** driven by sysinit. Please spend 30 seconds
reading the code before spreading misinformed FUD.
Would it make you happier if I removed SI_SUB_CONSOLE to prove the point?
Hmm, I think I will.. It seems to be confusing some people.
Cheers,
-Peter
--
Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5
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