/* * 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 1.69 1997/08/15 02:33:30 fsmp Exp $ */ #include "opt_rlimit.h" #include "opt_devfs.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef SMP #include #endif /* SMP */ #include #include #include #include #include #include #include #include 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; #ifdef SMP /* * XXX curproc is per-cpu in SMP, and exists in freshly mapped pages, * so its value must be initialized now before it is used by various * initialization routines. proc0_init() isn't soon enough: * among other things, configure() is called first, and may call * setdumpdev(), which panics without a valid curproc. */ curproc = &proc0; #endif /* SMP */ /* * 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(); /* * additional VM structures */ vm_init2(); /* * 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"); }