From: "Russ Cox" <rsc@plan9.bell-labs.com>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] kernel config changes
Date: Fri, 24 Jan 2003 11:52:40 -0500 [thread overview]
Message-ID: <33aa3b4ddd8d675fa801e5870918d68d@plan9.bell-labs.com> (raw)
In-Reply-To: <C2ACD5D6-2F45-11D7-8ECC-000A27AE643E@sockfarm.net>
There's now both port/initcode.c, which does almost
what I posted (I've since noticed that the exec cmd line
args get passed into the main function, now called startboot):
#include <u.h>
#include <libc.h>
char cons[] = "#c/cons";
char boot[] = "/boot/boot";
char dev[] = "/dev";
char c[] = "#c";
char e[] = "#e";
char ec[] = "#ec";
char s[] = "#s";
char srv[] = "/srv";
char env[] = "/env";
void
startboot(char *argv0, char **argv)
{
open(cons, OREAD);
open(cons, OWRITE);
open(cons, OWRITE);
bind(c, dev, MAFTER);
bind(ec, env, MAFTER);
bind(e, env, MCREATE|MAFTER);
bind(s, srv, MREPL|MCREATE);
exec(boot, argv);
for(;;);
}
On the MIPS there is still an assembly stub
that initializes R30 (SB).
TEXT _main(SB), $8
MOVW $setR30(SB), R30
MOVW $boot(SB), R1
ADD $12, R29, R2 /* get a pointer to 0(FP) */
MOVW R1, 4(R29)
MOVW R2, 8(R29)
JAL startboot(SB)
The 386 uses just the C code -- no assembly required.
You should be able to do almost exactly the same
thing for the bitsy -- SB is R12.
Russ
next prev parent reply other threads:[~2003-01-24 16:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-13 8:32 Russ Cox
2002-12-13 16:32 ` Jack Johnson
2003-01-24 2:44 ` John Packer
2003-01-24 16:52 ` Russ Cox [this message]
2003-01-26 22:40 ` john
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