diff options
Diffstat (limited to 'sys/kern/init_main.c')
| -rw-r--r-- | sys/kern/init_main.c | 698 |
1 files changed, 698 insertions, 0 deletions
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c new file mode 100644 index 0000000..246684f --- /dev/null +++ b/sys/kern/init_main.c @@ -0,0 +1,698 @@ +/* + * 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 1.102 1998/12/30 10:38:58 dfr Exp $ + */ + +#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 <sys/unistd.h> +#include <sys/malloc.h> + +#include <machine/cpu.h> + +#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)); + +/* Components of the first process -- never freed. */ +static struct session session0; +static struct pgrp pgrp0; +struct proc proc0; +static struct pcred cred0; +#ifdef COMPAT_LINUX_THREADS +static struct procsig procsig0; +#endif /* COMPAT_LINUX_THREADS */ +static struct filedesc0 filedesc0; +static struct plimit limit0; +static struct vmspace vmspace0; +struct proc *initproc; + +int cmask = CMASK; +extern struct user *proc0paddr; + +struct vnode *rootvp; +int boothowto = 0; /* initialized so that it can be patched */ + +struct timeval boottime; +SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, + CTLFLAG_RD, &boottime, timeval, ""); + +static int shutdowntimeout = 120; +SYSCTL_INT(_kern, OID_AUTO, shutdown_timeout, + CTLFLAG_RW, &shutdowntimeout, 0, ""); + +/* + * 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) + +/* + * The sysinit table itself. Items are checked off as the are run. + * If we want to register new sysinit types, add them to newsysinit. + */ +struct sysinit **sysinit = (struct sysinit **)sysinit_set.ls_items; +struct sysinit **newsysinit; + +/* + * Merge a new sysinit set into the current set, reallocating it if + * necessary. This can only be called after malloc is running. + */ +void +sysinit_add(set) + struct sysinit **set; +{ + struct sysinit **newset; + struct sysinit **sipp; + struct sysinit **xipp; + int count = 0; + + if (newsysinit) + for (sipp = newsysinit; *sipp; sipp++) + count++; + else + for (sipp = sysinit; *sipp; sipp++) + count++; + for (sipp = set; *sipp; sipp++) + count++; + count++; /* Trailing NULL */ + newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); + if (newset == NULL) + panic("cannot malloc for sysinit"); + xipp = newset; + if (newsysinit) + for (sipp = newsysinit; *sipp; sipp++) + *xipp++ = *sipp; + else + for (sipp = sysinit; *sipp; sipp++) + *xipp++ = *sipp; + for (sipp = set; *sipp; sipp++) + *xipp++ = *sipp; + *xipp = NULL; + if (newsysinit) + free(newsysinit, M_TEMP); + newsysinit = newset; +} + +/* + * 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". + */ +void +main(framep) + void *framep; +{ + + register struct sysinit **sipp; /* system initialization*/ + register struct sysinit **xipp; /* interior loop of sort*/ + register struct sysinit *save; /* bubble*/ + + /* + * Copy the locore.s frame pointer for proc0, this is forked into + * all other processes. + */ + init_framep = framep; + +restart: + /* + * Perform a bubble sort of the system initialization objects by + * their subsystem (primary key) and order (secondary key). + */ + for (sipp = sysinit; *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 = sysinit; *sipp; sipp++) { + + if ((*sipp)->subsystem == SI_SUB_DUMMY) + continue; /* skip dummy task(s)*/ + + if ((*sipp)->subsystem == SI_SUB_DONE) + continue; + + switch( (*sipp)->type) { + case SI_TYPE_DEFAULT: + /* no special processing*/ + (*((*sipp)->func))((*sipp)->udata); + break; + + case SI_TYPE_KTHREAD: +#if !defined(SMP) + /* kernel thread*/ + if (fork1(&proc0, RFMEM|RFFDG|RFPROC)) + panic("fork kernel thread"); + cpu_set_fork_handler(pfind(proc0.p_retval[0]), + (*sipp)->func, (*sipp)->udata); + break; +#endif + + case SI_TYPE_KPROCESS: + if (fork1(&proc0, RFFDG|RFPROC)) + panic("fork kernel process"); + cpu_set_fork_handler(pfind(proc0.p_retval[0]), + (*sipp)->func, (*sipp)->udata); + break; + + default: + panic("init_main: unrecognized init type"); + } + + /* Check off the one we're just done */ + (*sipp)->subsystem = SI_SUB_DONE; + + /* Check if we've installed more sysinit items via KLD */ + if (newsysinit != NULL) { + if (sysinit != (struct sysinit **)sysinit_set.ls_items) + free(sysinit, M_TEMP); + sysinit = newsysinit; + newsysinit = NULL; + goto restart; + } + } + + 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 */ + +#ifdef COMPAT_LINUX_THREADS + /* Create procsig. */ + p->p_procsig = &procsig0; + p->p_procsig->ps_refcnt = 2; + +#endif /* COMPAT_LINUX_THREADS */ + /* 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_cpulimit = RLIM_INFINITY; + limit0.p_refcnt = 1; + + + /* Allocate a prototype map so we have something to fork. */ + pmap_pinit0(&vmspace0.vm_pmap); + p->p_vmspace = &vmspace0; + vmspace0.vm_refcnt = 1; + vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS), + trunc_page(VM_MAXUSER_ADDRESS)); + vmspace0.vm_map.pmap = &vmspace0.vm_pmap; + p->p_addr = proc0paddr; /* XXX */ + +#ifndef __alpha__ /* XXX what is this? */ +#define INCOMPAT_LITES2 +#ifdef INCOMPAT_LITES2 + /* + * proc0 needs to have a coherent frame base in its stack. + */ + cpu_set_init_frame(p, init_framep); /* XXX! */ +#endif /* INCOMPAT_LITES2*/ +#endif + + /* + * 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); + + /* + * Initialize the procfs flags (to 0, of course) + */ + p->p_stops = p->p_stype = p->p_step = 0; + +} +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 timespec ts; + + /* + * Now can look at time, having had a chance to verify the time + * from the file system. Reset p->p_runtime as it may have been + * munched in mi_switch() after the time got set. Set + * p->p_switchtime to be consistent with this unmunching. + */ + microtime(&proc0.p_stats->p_start); + proc0.p_runtime = 0; + microuptime(&proc0.p_switchtime); + + /* + * Give the ``random'' number generator a thump. + * XXX: Does read_random() contain enough bits to be used here ? + */ + nanotime(&ts); + srandom(ts.tv_sec ^ ts.tv_nsec); + + /* 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 root_conf __P((void *dummy)); +static void +root_conf(dummy) + void *dummy; +{ + cpu_rootconf(); +} +SYSINIT(root_conf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, root_conf, 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, 0, &proc0); + fdp->fd_fd.fd_rdir = rootvnode; +} +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_KP(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, error; + char **pathp, *path, *ucp, **uap, *arg0, *arg1; + + initproc = p; + + /* + * Need just enough stack to hold the faked-up "execve()" arguments. + */ + addr = trunc_page(USRSTACK - 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 **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); + (void)suword((caddr_t)--uap, (long)0); /* terminator */ + (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); + (void)suword((caddr_t)--uap, (long)(intptr_t)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)) == 0) + return; + if (error != ENOENT) + printf("exec %s: error %d\n", path, error); + } + printf("init: not found\n"); + panic("no init"); +} |
