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freebsd-skq/sys/kern/init_main.c
Jeffrey Hsu a3bfb996f6 From Lite2: proc LIST changes 
call kern_proc.c:procinit() to initialize LISTs
	call to usrinfoinit() subsumed by procinit()
Reviewed by:	davidg & bde
1996-03-11 06:14:38 +00:00

636 lines
17 KiB
C
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/*
* Copyright (c) 1995 Terrence R. Lambert
* All rights reserved.
*
* Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)init_main.c 8.9 (Berkeley) 1/21/94
* $Id: init_main.c,v 1.39 1996/03/02 18:24:05 peter Exp $
*/
#include "opt_rlimit.h"
#include <sys/param.h>
#include <sys/filedesc.h>
#include <sys/errno.h>
#include <sys/exec.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#ifdef GPROF
#include <sys/gmon.h>
#endif
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/signalvar.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/sysent.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/clist.h>
#include <sys/msg.h>
#include <sys/protosw.h>
#include <sys/reboot.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/sysproto.h>
#include <sys/vmmeter.h>
#include <ufs/ufs/quota.h>
#include <machine/cpu.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_prot.h>
#include <vm/lock.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_extern.h>
#include <sys/user.h>
extern struct linker_set sysinit_set; /* XXX */
extern void __main __P((void));
extern void main __P((void *framep));
/* Components of the first process -- never freed. */
static struct session session0;
static struct pgrp pgrp0;
struct proc proc0;
static struct pcred cred0;
static struct filedesc0 filedesc0;
static struct plimit limit0;
static struct vmspace vmspace0;
struct proc *curproc = &proc0;
struct proc *initproc;
int cmask = CMASK;
extern struct user *proc0paddr;
struct vnode *rootvp;
int boothowto;
struct timeval boottime;
SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime,
CTLFLAG_RW, &boottime, timeval, "");
struct timeval runtime;
/*
* Promiscuous argument pass for start_init()
*
* This is a kludge because we use a return from main() rather than a call
* to a new reoutine in locore.s to kick the kernel alive from locore.s.
*/
static void *init_framep;
#if __GNUC__ >= 2
void __main() {}
#endif
/*
* This ensures that there is at least one entry so that the sysinit_set
* symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
* executed.
*/
SYSINIT(placeholder, SI_SUB_DUMMY,SI_ORDER_ANY, NULL, NULL)
/*
* System startup; initialize the world, create process 0, mount root
* filesystem, and fork to create init and pagedaemon. Most of the
* hard work is done in the lower-level initialization routines including
* startup(), which does memory initialization and autoconfiguration.
*
* This allows simple addition of new kernel subsystems that require
* boot time initialization. It also allows substitution of subsystem
* (for instance, a scheduler, kernel profiler, or VM system) by object
* module. Finally, it allows for optional "kernel threads", like an LFS
* cleaner.
*/
void
main(framep)
void *framep;
{
register struct sysinit **sipp; /* system initialization*/
register struct sysinit **xipp; /* interior loop of sort*/
register struct sysinit *save; /* bubble*/
int rval[2]; /* SI_TYPE_KTHREAD support*/
/*
* Save the locore.s frame pointer for start_init().
*/
init_framep = framep;
/*
* Perform a bubble sort of the system initialization objects by
* their subsystem (primary key) and order (secondary key).
*
* Since some things care about execution order, this is the
* operation which ensures continued function.
*/
for( sipp = (struct sysinit **)sysinit_set.ls_items; *sipp; sipp++) {
for( xipp = sipp + 1; *xipp; xipp++) {
if( (*sipp)->subsystem < (*xipp)->subsystem ||
( (*sipp)->subsystem == (*xipp)->subsystem &&
(*sipp)->order < (*xipp)->order))
continue; /* skip*/
save = *sipp;
*sipp = *xipp;
*xipp = save;
}
}
/*
* Traverse the (now) ordered list of system initialization tasks.
* Perform each task, and continue on to the next task.
*
* The last item on the list is expected to be the scheduler,
* which will not return.
*/
for( sipp = (struct sysinit **)sysinit_set.ls_items; *sipp; sipp++) {
if( (*sipp)->subsystem == SI_SUB_DUMMY)
continue; /* skip dummy task(s)*/
switch( (*sipp)->type) {
case SI_TYPE_DEFAULT:
/* no special processing*/
(*((*sipp)->func))( (*sipp)->udata);
break;
case SI_TYPE_KTHREAD:
/* kernel thread*/
if (fork(&proc0, NULL, rval))
panic("fork kernel process");
if (rval[1]) {
(*((*sipp)->func))( (*sipp)->udata);
/*
* The call to start "init" returns
* here after the scheduler has been
* started, and returns to the caller
* in i386/i386/locore.s. This is a
* necessary part of initialization
* and is rather non-obvious.
*
* No other "kernel threads" should
* return here. Call panic() instead.
*/
return;
}
break;
default:
panic( "init_main: unrecognized init type");
}
}
/* NOTREACHED*/
}
/*
* Start a kernel process. This is called after a fork() call in
* main() in the file kern/init_main.c.
*
* This function is used to start "internal" daemons.
*/
/* ARGSUSED*/
void
kproc_start(udata)
void *udata;
{
struct kproc_desc *kp = udata;
struct proc *p = curproc;
/* save a global descriptor, if desired*/
if( kp->global_procpp != NULL)
*kp->global_procpp = p;
/* this is a non-swapped system process*/
p->p_flag |= P_INMEM | P_SYSTEM;
/* set up arg0 for 'ps', et al*/
strcpy( p->p_comm, kp->arg0);
/* call the processes' main()...*/
(*kp->func)();
/* NOTREACHED */
panic("kproc_start: %s", kp->arg0);
}
/*
***************************************************************************
****
**** The following SYSINIT's belong elsewhere, but have not yet
**** been moved.
****
***************************************************************************
*/
#ifdef OMIT
/*
* Handled by vfs_mountroot (bad idea) at this time... should be
* done the same as 4.4Lite2.
*/
SYSINIT(swapinit, SI_SUB_SWAP, SI_ORDER_FIRST, swapinit, NULL)
#endif /* OMIT*/
/*
* Should get its own file...
*/
#ifdef HPFPLIB
char copyright[] =
"Copyright (c) 1982, 1986, 1989, 1991, 1993\n\tThe Regents of the University of California.\nCopyright (c) 1992 Hewlett-Packard Company\nCopyright (c) 1992 Motorola Inc.\nAll rights reserved.\n\n";
#else
char copyright[] =
"Copyright (c) 1982, 1986, 1989, 1991, 1993\n\tThe Regents of the University of California. All rights reserved.\n\n";
#endif
static void print_caddr_t __P((void *data));
static void
print_caddr_t(data)
void *data;
{
printf("%s", (char *)data);
}
SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright)
/*
***************************************************************************
****
**** The two following SYSINT's are proc0 specific glue code. I am not
**** convinced that they can not be safely combined, but their order of
**** operation has been maintained as the same as the original init_main.c
**** for right now.
****
**** These probably belong in init_proc.c or kern_proc.c, since they
**** deal with proc0 (the fork template process).
****
***************************************************************************
*/
/* ARGSUSED*/
static void proc0_init __P((void *dummy));
static void
proc0_init(dummy)
void *dummy;
{
register struct proc *p;
register struct filedesc0 *fdp;
register int i;
/*
* Initialize the current process pointer (curproc) before
* any possible traps/probes to simplify trap processing.
*/
p = &proc0;
curproc = p; /* XXX redundant*/
/*
* Initialize process and pgrp structures.
*/
procinit();
/*
* Create process 0 (the swapper).
*/
LIST_INSERT_HEAD(&allproc, p, p_list);
p->p_pgrp = &pgrp0;
LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
LIST_INIT(&pgrp0.pg_members);
LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
pgrp0.pg_session = &session0;
session0.s_count = 1;
session0.s_leader = p;
p->p_sysent = &aout_sysvec;
p->p_flag = P_INMEM | P_SYSTEM;
p->p_stat = SRUN;
p->p_nice = NZERO;
p->p_rtprio.type = RTP_PRIO_NORMAL;
p->p_rtprio.prio = 0;
bcopy("swapper", p->p_comm, sizeof ("swapper"));
/* Create credentials. */
cred0.p_refcnt = 1;
p->p_cred = &cred0;
p->p_ucred = crget();
p->p_ucred->cr_ngroups = 1; /* group 0 */
/* Create the file descriptor table. */
fdp = &filedesc0;
p->p_fd = &fdp->fd_fd;
fdp->fd_fd.fd_refcnt = 1;
fdp->fd_fd.fd_cmask = cmask;
fdp->fd_fd.fd_ofiles = fdp->fd_dfiles;
fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags;
fdp->fd_fd.fd_nfiles = NDFILE;
/* Create the limits structures. */
p->p_limit = &limit0;
for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++)
limit0.pl_rlimit[i].rlim_cur =
limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY;
limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE;
limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC;
i = ptoa(cnt.v_free_count);
limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i;
limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
limit0.p_refcnt = 1;
/* Allocate a prototype map so we have something to fork. */
p->p_vmspace = &vmspace0;
vmspace0.vm_refcnt = 1;
pmap_pinit(&vmspace0.vm_pmap);
vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS),
trunc_page(VM_MAX_ADDRESS), TRUE);
vmspace0.vm_map.pmap = &vmspace0.vm_pmap;
p->p_addr = proc0paddr; /* XXX */
#define INCOMPAT_LITES2
#ifdef INCOMPAT_LITES2
/*
* proc0 needs to have a coherent frame base, too.
* This probably makes the identical call for the init proc
* that happens later unnecessary since it should inherit
* it during the fork.
*/
cpu_set_init_frame(p, init_framep); /* XXX! */
#endif /* INCOMPAT_LITES2*/
/*
* We continue to place resource usage info and signal
* actions in the user struct so they're pageable.
*/
p->p_stats = &p->p_addr->u_stats;
p->p_sigacts = &p->p_addr->u_sigacts;
/*
* Charge root for one process.
*/
(void)chgproccnt(0, 1);
}
SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL)
/* ARGSUSED*/
static void proc0_post __P((void *dummy));
static void
proc0_post(dummy)
void *dummy;
{
/*
* Now can look at time, having had a chance to verify the time
* from the file system. Reset p->p_rtime as it may have been
* munched in mi_switch() after the time got set.
*/
proc0.p_stats->p_start = runtime = mono_time = boottime = time;
proc0.p_rtime.tv_sec = proc0.p_rtime.tv_usec = 0;
/* Initialize signal state for process 0. */
siginit(&proc0);
}
SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL)
/*
***************************************************************************
****
**** The following SYSINIT's and glue code should be moved to the
**** respective files on a per subsystem basis.
****
***************************************************************************
*/
/* ARGSUSED*/
static void sched_setup __P((void *dummy));
static void
sched_setup(dummy)
void *dummy;
{
/* Kick off timeout driven events by calling first time. */
roundrobin(NULL);
schedcpu(NULL);
}
SYSINIT(sched_setup, SI_SUB_KICK_SCHEDULER, SI_ORDER_FIRST, sched_setup, NULL)
/* ARGSUSED*/
static void xxx_vfs_mountroot __P((void *dummy));
static void
xxx_vfs_mountroot(dummy)
void *dummy;
{
/* Mount the root file system. */
if ((*mountroot)(mountrootvfsops))
panic("cannot mount root");
}
SYSINIT(mountroot, SI_SUB_ROOT, SI_ORDER_FIRST, xxx_vfs_mountroot, NULL)
/* ARGSUSED*/
static void xxx_vfs_root_fdtab __P((void *dummy));
static void
xxx_vfs_root_fdtab(dummy)
void *dummy;
{
register struct filedesc0 *fdp = &filedesc0;
/* Get the vnode for '/'. Set fdp->fd_fd.fd_cdir to reference it. */
if (VFS_ROOT(mountlist.cqh_first, &rootvnode))
panic("cannot find root vnode");
fdp->fd_fd.fd_cdir = rootvnode;
VREF(fdp->fd_fd.fd_cdir);
VOP_UNLOCK(rootvnode);
fdp->fd_fd.fd_rdir = NULL;
}
SYSINIT(retrofit, SI_SUB_ROOT_FDTAB, SI_ORDER_FIRST, xxx_vfs_root_fdtab, NULL)
/*
***************************************************************************
****
**** The following code probably belongs in another file, like
**** kern/init_init.c. It is here for two reasons only:
****
**** 1) This code returns to startup the system; this is
**** abnormal for a kernel thread.
**** 2) This code promiscuously uses init_frame
****
***************************************************************************
*/
static void kthread_init __P((void *dummy));
SYSINIT_KT(init,SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kthread_init, NULL)
static void start_init __P((struct proc *p, void *framep));
/* ARGSUSED*/
static void
kthread_init(dummy)
void *dummy;
{
/* Create process 1 (init(8)). */
start_init(curproc, init_framep);
/*
* This is the only kernel thread allowed to return yo the
* caller!!!
*/
return;
}
/*
* List of paths to try when searching for "init".
*/
static char *initpaths[] = {
"/sbin/init",
"/sbin/oinit",
"/sbin/init.bak",
"/stand/sysinstall",
NULL,
};
/*
* Start the initial user process; try exec'ing each pathname in "initpaths".
* The program is invoked with one argument containing the boot flags.
*/
static void
start_init(p, framep)
struct proc *p;
void *framep;
{
vm_offset_t addr;
struct execve_args args;
int options, i, retval[2], error;
char **pathp, *path, *ucp, **uap, *arg0, *arg1;
initproc = p;
/*
* We need to set the system call frame as if we were entered through
* a syscall() so that when we call execve() below, it will be able
* to set the entry point (see setregs) when it tries to exec. The
* startup code in "locore.s" has allocated space for the frame and
* passed a pointer to that space as main's argument.
*/
cpu_set_init_frame(p, framep);
/*
* Need just enough stack to hold the faked-up "execve()" arguments.
*/
addr = trunc_page(VM_MAXUSER_ADDRESS - PAGE_SIZE);
if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
panic("init: couldn't allocate argument space");
p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
p->p_vmspace->vm_ssize = 1;
for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) {
/*
* Move out the boot flag argument.
*/
options = 0;
ucp = (char *)USRSTACK;
(void)subyte(--ucp, 0); /* trailing zero */
if (boothowto & RB_SINGLE) {
(void)subyte(--ucp, 's');
options = 1;
}
#ifdef notyet
if (boothowto & RB_FASTBOOT) {
(void)subyte(--ucp, 'f');
options = 1;
}
#endif
#ifdef BOOTCDROM
(void)subyte(--ucp, 'C');
options = 1;
#endif
if (options == 0)
(void)subyte(--ucp, '-');
(void)subyte(--ucp, '-'); /* leading hyphen */
arg1 = ucp;
/*
* Move out the file name (also arg 0).
*/
for (i = strlen(path) + 1; i >= 0; i--)
(void)subyte(--ucp, path[i]);
arg0 = ucp;
/*
* Move out the arg pointers.
*/
uap = (char **)((int)ucp & ~(NBPW-1));
(void)suword((caddr_t)--uap, 0); /* terminator */
(void)suword((caddr_t)--uap, (int)arg1);
(void)suword((caddr_t)--uap, (int)arg0);
/*
* Point at the arguments.
*/
args.fname = arg0;
args.argv = uap;
args.envv = NULL;
/*
* Now try to exec the program. If can't for any reason
* other than it doesn't exist, complain.
*
* Otherwise return to main() which returns to btext
* which completes the system startup.
*/
if ((error = execve(p, &args, &retval[0])) == 0)
return;
if (error != ENOENT)
printf("exec %s: error %d\n", path, error);
}
printf("init: not found\n");
panic("no init");
}
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