642 lines
17 KiB
C
642 lines
17 KiB
C
/*
|
|
* 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 1.65 1997/06/22 16:04:09 peter Exp $
|
|
*/
|
|
|
|
#include "opt_rlimit.h"
|
|
#include "opt_devfs.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/file.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/sysctl.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/reboot.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/vmmeter.h>
|
|
|
|
#include <machine/cpu.h>
|
|
#if defined(SMP)
|
|
#include <machine/smp.h>
|
|
#endif /* SMP */
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_prot.h>
|
|
#include <sys/lock.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
#include <sys/user.h>
|
|
#include <sys/copyright.h>
|
|
|
|
extern struct linker_set sysinit_set; /* XXX */
|
|
|
|
extern void __main __P((void));
|
|
extern void main __P((void *framep));
|
|
extern void secondary_main __P((void));
|
|
|
|
/* 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;
|
|
#ifndef SMP /* per-cpu on smp */
|
|
struct proc *curproc = &proc0;
|
|
#endif
|
|
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, "");
|
|
|
|
static int shutdowntimeout = 120;
|
|
SYSCTL_INT(_kern, OID_AUTO, shutdown_timeout,
|
|
CTLFLAG_RW, &shutdowntimeout, 0, "");
|
|
|
|
#ifndef SMP /* per-cpu on smp */
|
|
struct timeval runtime;
|
|
#endif
|
|
|
|
/*
|
|
* Promiscuous argument pass for start_init()
|
|
*
|
|
* This is a kludge because we use a return from main() rather than a call
|
|
* to a new routine 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*/
|
|
|
|
/*
|
|
* Copy the locore.s frame pointer for proc0, this is forked into
|
|
* all other processes.
|
|
*/
|
|
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");
|
|
cpu_set_fork_handler(pfind(rval[0]), (*sipp)->func, (*sipp)->udata);
|
|
break;
|
|
|
|
default:
|
|
panic( "init_main: unrecognized init type");
|
|
}
|
|
}
|
|
|
|
panic("Shouldn't get here!");
|
|
/* 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;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
printf("Start pid=%d <%s>\n",p->p_pid, kp->arg0);
|
|
#endif
|
|
|
|
|
|
/* 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*/
|
|
|
|
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 unsigned 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();
|
|
|
|
/*
|
|
* Initialize sleep queue hash table
|
|
*/
|
|
sleepinit();
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* Link for kernel based threads
|
|
*/
|
|
p->p_peers = 0;
|
|
p->p_leader = p;
|
|
|
|
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 =
|
|
limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
|
|
limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur =
|
|
limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
|
|
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_MAXUSER_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 in it's stack.
|
|
*/
|
|
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;
|
|
{
|
|
struct timeval tv;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
gettime(&boottime);
|
|
proc0.p_stats->p_start = runtime = mono_time = boottime;
|
|
proc0.p_rtime.tv_sec = proc0.p_rtime.tv_usec = 0;
|
|
|
|
/*
|
|
* Give the ``random'' number generator a thump.
|
|
*/
|
|
microtime(&tv);
|
|
srandom(tv.tv_sec ^ tv.tv_usec);
|
|
|
|
/* 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 *fsnamep));
|
|
#ifdef BOOTP
|
|
extern void bootpc_init __P((void));
|
|
#endif
|
|
static void
|
|
xxx_vfs_mountroot(fsnamep)
|
|
void *fsnamep;
|
|
{
|
|
/* XXX Add a separate SYSINIT entry */
|
|
#ifdef BOOTP
|
|
bootpc_init();
|
|
#endif
|
|
/* Mount the root file system. */
|
|
if (vfs_mountrootfs(*((char **) fsnamep)))
|
|
panic("cannot mount root");
|
|
}
|
|
SYSINIT(mountroot, SI_SUB_ROOT, SI_ORDER_FIRST, xxx_vfs_mountroot, &mountrootfsname)
|
|
|
|
/* 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, 0, &proc0);
|
|
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)
|
|
|
|
|
|
extern void prepare_usermode __P((void));
|
|
static void start_init __P((struct proc *p));
|
|
|
|
/* ARGSUSED*/
|
|
static void
|
|
kthread_init(dummy)
|
|
void *dummy;
|
|
{
|
|
|
|
/* Create process 1 (init(8)). */
|
|
start_init(curproc);
|
|
|
|
prepare_usermode();
|
|
|
|
/*
|
|
* This returns to the fork trampoline, then to user mode.
|
|
*/
|
|
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)
|
|
struct proc *p;
|
|
{
|
|
vm_offset_t addr;
|
|
struct execve_args args;
|
|
int options, i, retval[2], error;
|
|
char **pathp, *path, *ucp, **uap, *arg0, *arg1;
|
|
|
|
initproc = p;
|
|
|
|
/*
|
|
* 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 defined(DEVFS) && defined(DEVFS_ROOT)
|
|
(void)subyte(--ucp, 'd');
|
|
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");
|
|
}
|