diff options
Diffstat (limited to 'sys/kern/init_main.c')
| -rw-r--r-- | sys/kern/init_main.c | 669 |
1 files changed, 669 insertions, 0 deletions
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c new file mode 100644 index 0000000..d5c5656 --- /dev/null +++ b/sys/kern/init_main.c @@ -0,0 +1,669 @@ +/* + * 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 + * $FreeBSD$ + */ + +#include "opt_init_path.h" + +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/file.h> +#include <sys/filedesc.h> +#include <sys/ktr.h> +#include <sys/lock.h> +#include <sys/mount.h> +#include <sys/mutex.h> +#include <sys/sysctl.h> +#include <sys/proc.h> +#include <sys/resourcevar.h> +#include <sys/systm.h> +#include <sys/signalvar.h> +#include <sys/vnode.h> +#include <sys/sysent.h> +#include <sys/reboot.h> +#include <sys/sx.h> +#include <sys/sysproto.h> +#include <sys/vmmeter.h> +#include <sys/unistd.h> +#include <sys/malloc.h> +#include <sys/conf.h> + +#include <machine/cpu.h> + +#include <vm/vm.h> +#include <vm/vm_param.h> +#include <vm/pmap.h> +#include <vm/vm_map.h> +#include <sys/user.h> +#include <sys/copyright.h> + +void mi_startup(void); /* Should be elsewhere */ + +/* Components of the first process -- never freed. */ +static struct session session0; +static struct pgrp pgrp0; +struct proc proc0; +struct thread thread0; +static struct procsig procsig0; +static struct filedesc0 filedesc0; +static struct plimit limit0; +static struct vmspace vmspace0; +struct proc *initproc; + +int cmask = CMASK; +extern int fallback_elf_brand; + +struct vnode *rootvp; +int boothowto = 0; /* initialized so that it can be patched */ +SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, ""); +int bootverbose; +SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, ""); + +/* + * 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. + */ +SET_DECLARE(sysinit_set, struct sysinit); +struct sysinit **sysinit, **sysinit_end; +struct sysinit **newsysinit, **newsysinit_end; + +/* + * 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(struct sysinit **set, struct sysinit **set_end) +{ + struct sysinit **newset; + struct sysinit **sipp; + struct sysinit **xipp; + int count; + + count = set_end - set; + if (newsysinit) + count += newsysinit_end - newsysinit; + else + count += sysinit_end - sysinit; + 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 < newsysinit_end; sipp++) + *xipp++ = *sipp; + else + for (sipp = sysinit; sipp < sysinit_end; sipp++) + *xipp++ = *sipp; + for (sipp = set; sipp < set_end; sipp++) + *xipp++ = *sipp; + if (newsysinit) + free(newsysinit, M_TEMP); + newsysinit = newset; + newsysinit_end = newset + count; +} + +/* + * 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 +mi_startup(void) +{ + + register struct sysinit **sipp; /* system initialization*/ + register struct sysinit **xipp; /* interior loop of sort*/ + register struct sysinit *save; /* bubble*/ + + if (sysinit == NULL) { + sysinit = SET_BEGIN(sysinit_set); + sysinit_end = SET_LIMIT(sysinit_set); + } + +restart: + /* + * Perform a bubble sort of the system initialization objects by + * their subsystem (primary key) and order (secondary key). + */ + for (sipp = sysinit; sipp < sysinit_end; sipp++) { + for (xipp = sipp + 1; xipp < sysinit_end; 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 < sysinit_end; sipp++) { + + if ((*sipp)->subsystem == SI_SUB_DUMMY) + continue; /* skip dummy task(s)*/ + + if ((*sipp)->subsystem == SI_SUB_DONE) + continue; + + /* Call function */ + (*((*sipp)->func))((*sipp)->udata); + + /* 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 != SET_BEGIN(sysinit_set)) + free(sysinit, M_TEMP); + sysinit = newsysinit; + sysinit_end = newsysinit_end; + newsysinit = NULL; + newsysinit_end = NULL; + goto restart; + } + } + + panic("Shouldn't get here!"); + /* NOTREACHED*/ +} + + +/* + *************************************************************************** + **** + **** The following SYSINIT's belong elsewhere, but have not yet + **** been moved. + **** + *************************************************************************** + */ +static void +print_caddr_t(void *data __unused) +{ + printf("%s", (char *)data); +} +SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright) +SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, version) + +static void +set_boot_verbose(void *data __unused) +{ + + if (boothowto & RB_VERBOSE) + bootverbose++; +} +SYSINIT(boot_verbose, SI_SUB_TUNABLES, SI_ORDER_ANY, set_boot_verbose, NULL) + +/* + *************************************************************************** + **** + **** 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(void *dummy __unused) +{ + register struct proc *p; + register struct filedesc0 *fdp; + register unsigned i; + struct thread *td; + struct ksegrp *kg; + struct kse *ke; + + GIANT_REQUIRED; + p = &proc0; + td = &thread0; + + /* + * Initialize magic number. + */ + p->p_magic = P_MAGIC; + + /* + * Initialize thread, 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); + LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); + mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); + 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; + mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); + session0.s_count = 1; + session0.s_leader = p; + +#ifdef __ELF__ + p->p_sysent = &elf_freebsd_sysvec; +#else + p->p_sysent = &aout_sysvec; +#endif + + ke = &proc0.p_kse; /* XXXKSE */ + kg = &proc0.p_ksegrp; /* XXXKSE */ + p->p_flag = P_SYSTEM; + p->p_sflag = PS_INMEM; + p->p_stat = SRUN; + p->p_ksegrp.kg_nice = NZERO; + kg->kg_pri_class = PRI_TIMESHARE; + kg->kg_user_pri = PUSER; + td->td_priority = PVM; + td->td_base_pri = PUSER; + + p->p_peers = 0; + p->p_leader = p; + + bcopy("swapper", p->p_comm, sizeof ("swapper")); + + callout_init(&p->p_itcallout, 0); + callout_init(&td->td_slpcallout, 1); + + /* Create credentials. */ + p->p_ucred = crget(); + p->p_ucred->cr_ngroups = 1; /* group 0 */ + p->p_ucred->cr_uidinfo = uifind(0); + p->p_ucred->cr_ruidinfo = uifind(0); + p->p_ucred->cr_prison = NULL; /* Don't jail it. */ + td->td_ucred = crhold(p->p_ucred); + + /* Create procsig. */ + p->p_procsig = &procsig0; + p->p_procsig->ps_refcnt = 1; + + /* Initialize signal state for process 0. */ + siginit(&proc0); + + /* Create the file descriptor table. */ + fdp = &filedesc0; + p->p_fd = &fdp->fd_fd; + mtx_init(&fdp->fd_fd.fd_mtx, FILEDESC_LOCK_DESC, NULL, MTX_DEF); + 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(vmspace_pmap(&vmspace0)); + 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 = vmspace_pmap(&vmspace0); + + /* + * We continue to place resource usage info and signal + * actions in the user struct so they're pageable. + */ + p->p_stats = &p->p_uarea->u_stats; + p->p_sigacts = &p->p_uarea->u_sigacts; + + /* + * Charge root for one process. + */ + (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); +} +SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL) + +/* ARGSUSED*/ +static void +proc0_post(void *dummy __unused) +{ + struct timespec ts; + struct proc *p; + + /* + * Now we can look at the time, having had a chance to verify the + * time from the filesystem. Pretend that proc0 started now. + */ + sx_slock(&allproc_lock); + LIST_FOREACH(p, &allproc, p_list) { + microtime(&p->p_stats->p_start); + p->p_runtime.sec = 0; + p->p_runtime.frac = 0; + } + sx_sunlock(&allproc_lock); + binuptime(PCPU_PTR(switchtime)); + PCPU_SET(switchticks, ticks); + + /* + * Give the ``random'' number generator a thump. + */ + nanotime(&ts); + srandom(ts.tv_sec ^ ts.tv_nsec); +} +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. + **** + *************************************************************************** + */ + + +/* + *************************************************************************** + **** + **** The following code probably belongs in another file, like + **** kern/init_init.c. + **** + *************************************************************************** + */ + +/* + * List of paths to try when searching for "init". + */ +static char init_path[MAXPATHLEN] = +#ifdef INIT_PATH + __XSTRING(INIT_PATH); +#else + "/sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall"; +#endif +SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, + "Path used to search the init process"); + +/* + * Start the initial user process; try exec'ing each pathname in init_path. + * The program is invoked with one argument containing the boot flags. + */ +static void +start_init(void *dummy) +{ + vm_offset_t addr; + struct execve_args args; + int options, error; + char *var, *path, *next, *s; + char *ucp, **uap, *arg0, *arg1; + struct thread *td; + struct proc *p; + int init_does_devfs = 0; + + mtx_lock(&Giant); + + GIANT_REQUIRED; + + td = curthread; + p = td->td_proc; + + vfs_mountroot(NULL); + + /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ + if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode)) + panic("cannot find root vnode"); + FILEDESC_LOCK(p->p_fd); + p->p_fd->fd_cdir = rootvnode; + VREF(p->p_fd->fd_cdir); + p->p_fd->fd_rdir = rootvnode; + VREF(p->p_fd->fd_rdir); + FILEDESC_UNLOCK(p->p_fd); + VOP_UNLOCK(rootvnode, 0, td); + + if (devfs_present) { + /* + * For disk based systems, we probably cannot do this yet + * since the fs will be read-only. But a NFS root + * might be ok. It is worth a shot. + */ + error = vn_mkdir("/dev", 0700, UIO_SYSSPACE, td); + if (error == EEXIST) + error = 0; + if (error == 0) + error = kernel_vmount(0, "fstype", "devfs", + "fspath", "/dev", NULL); + if (error != 0) + init_does_devfs = 1; + } + + /* + * 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; + + if ((var = getenv("init_path")) != NULL) { + strncpy(init_path, var, sizeof init_path); + init_path[sizeof init_path - 1] = 0; + freeenv(var); + } + if ((var = getenv("kern.fallback_elf_brand")) != NULL) { + fallback_elf_brand = strtol(var, NULL, 0); + freeenv(var); + } + + for (path = init_path; *path != '\0'; path = next) { + while (*path == ':') + path++; + if (*path == '\0') + break; + for (next = path; *next != '\0' && *next != ':'; next++) + /* nothing */ ; + if (bootverbose) + printf("start_init: trying %.*s\n", (int)(next - path), + path); + + /* + * 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 (init_does_devfs) { + (void)subyte(--ucp, 'd'); + options = 1; + } + + if (options == 0) + (void)subyte(--ucp, '-'); + (void)subyte(--ucp, '-'); /* leading hyphen */ + arg1 = ucp; + + /* + * Move out the file name (also arg 0). + */ + (void)subyte(--ucp, 0); + for (s = next - 1; s >= path; s--) + (void)subyte(--ucp, *s); + 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 via fork_trampoline() all the way + * to user mode as init! + */ + if ((error = execve(td, &args)) == 0) { + mtx_unlock(&Giant); + return; + } + if (error != ENOENT) + printf("exec %.*s: error %d\n", (int)(next - path), + path, error); + } + printf("init: not found in path %s\n", init_path); + panic("no init"); +} + +/* + * Like kthread_create(), but runs in it's own address space. + * We do this early to reserve pid 1. + * + * Note special case - do not make it runnable yet. Other work + * in progress will change this more. + */ +static void +create_init(const void *udata __unused) +{ + struct ucred *newcred, *oldcred; + int error; + + error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, &initproc); + if (error) + panic("cannot fork init: %d\n", error); + /* divorce init's credentials from the kernel's */ + newcred = crget(); + PROC_LOCK(initproc); + initproc->p_flag |= P_SYSTEM; + oldcred = initproc->p_ucred; + crcopy(newcred, oldcred); + initproc->p_ucred = newcred; + PROC_UNLOCK(initproc); + crfree(oldcred); + mtx_lock_spin(&sched_lock); + initproc->p_sflag |= PS_INMEM; + mtx_unlock_spin(&sched_lock); + cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); +} +SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL) + +/* + * Make it runnable now. + */ +static void +kick_init(const void *udata __unused) +{ + struct thread *td; + + td = FIRST_THREAD_IN_PROC(initproc); + mtx_lock_spin(&sched_lock); + initproc->p_stat = SRUN; + setrunqueue(FIRST_THREAD_IN_PROC(initproc)); /* XXXKSE */ + mtx_unlock_spin(&sched_lock); +} +SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL) |
