diff options
Diffstat (limited to 'sys/kern/init_main.c')
| -rw-r--r-- | sys/kern/init_main.c | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c new file mode 100644 index 0000000..c649715 --- /dev/null +++ b/sys/kern/init_main.c @@ -0,0 +1,394 @@ +/* + * 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 + */ + +#include <sys/param.h> +#include <sys/filedesc.h> +#include <sys/errno.h> +#include <sys/exec.h> +#include <sys/kernel.h> +#include <sys/mount.h> +#include <sys/map.h> +#include <sys/proc.h> +#include <sys/resourcevar.h> +#include <sys/signalvar.h> +#include <sys/systm.h> +#include <sys/vnode.h> +#include <sys/conf.h> +#include <sys/buf.h> +#include <sys/clist.h> +#include <sys/device.h> +#include <sys/protosw.h> +#include <sys/reboot.h> +#include <sys/user.h> + +#include <ufs/ufs/quota.h> + +#include <machine/cpu.h> + +#include <vm/vm.h> + +#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 + +/* Components of the first process -- never freed. */ +struct session session0; +struct pgrp pgrp0; +struct proc proc0; +struct pcred cred0; +struct filedesc0 filedesc0; +struct plimit limit0; +struct vmspace vmspace0; +struct proc *curproc = &proc0; +struct proc *initproc, *pageproc; + +int cmask = CMASK; +extern struct user *proc0paddr; + +struct vnode *rootvp, *swapdev_vp; +int boothowto; +struct timeval boottime; +struct timeval runtime; + +static void start_init __P((struct proc *p, void *framep)); + +/* + * 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. + */ +main(framep) + void *framep; +{ + register struct proc *p; + register struct filedesc0 *fdp; + register struct pdevinit *pdev; + register int i; + int s, rval[2]; + extern int (*mountroot) __P((void)); + extern struct pdevinit pdevinit[]; + extern void roundrobin __P((void *)); + extern void schedcpu __P((void *)); + + /* + * Initialize the current process pointer (curproc) before + * any possible traps/probes to simplify trap processing. + */ + p = &proc0; + curproc = p; + /* + * Attempt to find console and initialize + * in case of early panic or other messages. + */ + consinit(); + printf(copyright); + + vm_mem_init(); + kmeminit(); + cpu_startup(); + + /* + * Create process 0 (the swapper). + */ + allproc = (volatile struct proc *)p; + p->p_prev = (struct proc **)&allproc; + p->p_pgrp = &pgrp0; + pgrphash[0] = &pgrp0; + pgrp0.pg_mem = p; + pgrp0.pg_session = &session0; + session0.s_count = 1; + session0.s_leader = p; + + p->p_flag = P_INMEM | P_SYSTEM; + p->p_stat = SRUN; + p->p_nice = NZERO; + 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(&p->p_vmspace->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 */ + + /* + * 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; + + /* + * Initialize per uid information structure and charge + * root for one process. + */ + usrinfoinit(); + (void)chgproccnt(0, 1); + + rqinit(); + + /* Configure virtual memory system, set vm rlimits. */ + vm_init_limits(p); + + /* Initialize the file systems. */ + vfsinit(); + + /* Start real time and statistics clocks. */ + initclocks(); + + /* Initialize mbuf's. */ + mbinit(); + + /* Initialize clists. */ + clist_init(); + +#ifdef SYSVSHM + /* Initialize System V style shared memory. */ + shminit(); +#endif + + /* Attach pseudo-devices. */ + for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) + (*pdev->pdev_attach)(pdev->pdev_count); + + /* + * Initialize protocols. Block reception of incoming packets + * until everything is ready. + */ + s = splimp(); + ifinit(); + domaininit(); + splx(s); + +#ifdef GPROF + /* Initialize kernel profiling. */ + kmstartup(); +#endif + + /* Kick off timeout driven events by calling first time. */ + roundrobin(NULL); + schedcpu(NULL); + + /* Mount the root file system. */ + if ((*mountroot)()) + panic("cannot mount root"); + + /* Get the vnode for '/'. Set fdp->fd_fd.fd_cdir to reference it. */ + if (VFS_ROOT(mountlist.tqh_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; + swapinit(); + + /* + * 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. + */ + p->p_stats->p_start = runtime = mono_time = boottime = time; + p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; + + /* Initialize signal state for process 0. */ + siginit(p); + + /* Create process 1 (init(8)). */ + if (fork(p, NULL, rval)) + panic("fork init"); + if (rval[1]) { + start_init(curproc, framep); + return; + } + + /* Create process 2 (the pageout daemon). */ + if (fork(p, NULL, rval)) + panic("fork pager"); + if (rval[1]) { + /* + * Now in process 2. + */ + p = curproc; + pageproc = p; + p->p_flag |= P_INMEM | P_SYSTEM; /* XXX */ + bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon")); + vm_pageout(); + /* NOTREACHED */ + } + + /* The scheduler is an infinite loop. */ + scheduler(); + /* NOTREACHED */ +} + +/* + * List of paths to try when searching for "init". + */ +static char *initpaths[] = { + "/sbin/init", + "/sbin/oinit", + "/sbin/init.bak", + 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_MAX_ADDRESS - PAGE_SIZE); + if (vm_allocate(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, FALSE) != 0) + panic("init: couldn't allocate argument space"); + p->p_vmspace->vm_maxsaddr = (caddr_t)addr; + + 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 + 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.argp = uap; + args.envp = NULL; + + /* + * Now try to exec the program. If can't for any reason + * other than it doesn't exist, complain. + */ + if ((error = execve(p, &args, &retval)) == 0) + return; + if (error != ENOENT) + printf("exec %s: error %d\n", path, error); + } + printf("init: not found\n"); + panic("no init"); +} |
