common/os/main.c

	main.c revision 45916cd2fec6e79bca5dee0421bd39e3c2910d1e
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */


#pragma ident   "%Z%%M% %I% %E% SMI"    /* from SVr4.0 1.31 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysmacros.h>
#include <sys/pcb.h>
#include <sys/systm.h>
#include <sys/signal.h>
#include <sys/cred.h>
#include <sys/user.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/time.h>
#include <sys/file.h>
#include <sys/priocntl.h>
#include <sys/procset.h>
#include <sys/disp.h>
#include <sys/callo.h>
#include <sys/callb.h>
#include <sys/debug.h>
#include <sys/conf.h>
#include <sys/bootconf.h>
#include <sys/utsname.h>
#include <sys/cmn_err.h>
#include <sys/vmparam.h>
#include <sys/modctl.h>
#include <sys/vm.h>
#include <sys/callb.h>
#include <sys/kmem.h>
#include <sys/vmem.h>
#include <sys/cpuvar.h>
#include <sys/cladm.h>
#include <sys/corectl.h>
#include <sys/exec.h>
#include <sys/syscall.h>
#include <sys/reboot.h>
#include <sys/task.h>
#include <sys/exacct.h>
#include <sys/autoconf.h>
#include <sys/errorq.h>
#include <sys/class.h>
#include <sys/stack.h>

#include <vm/as.h>
#include <vm/seg_kmem.h>
#include <sys/dc_ki.h>

#include <c2/audit.h>

/* well known processes */
proc_t *proc_sched;     /* memory scheduler */
proc_t *proc_init;      /* init */
proc_t *proc_pageout;       /* pageout daemon */
proc_t *proc_fsflush;       /* fsflush daemon */

pgcnt_t maxmem;     /* Maximum available memory in pages.   */
pgcnt_t freemem;    /* Current available memory in pages.   */
int audit_active;
int interrupts_unleashed;   /* set when we do the first spl0() */

kmem_cache_t *process_cache;    /* kmem cache for proc structures */

/*
 * Process 0's lwp directory and lwpid hash table.
 */
lwpdir_t p0_lwpdir[2];
lwpdir_t *p0_tidhash[2];
lwpent_t p0_lep;

/*
 * Machine-independent initialization code
 * Called from cold start routine as
 * soon as a stack and segmentation
 * have been established.
 * Functions:
 *  clear and free user core
 *  turn on clock
 *  hand craft 0th process
 *  call all initialization routines
 *  fork    - process 0 to schedule
 *      - process 1 execute bootstrap
 *      - process 2 to page out
 *  create system threads
 */

int cluster_bootflags = 0;

void
cluster_wrapper(void)
{
    cluster();
    panic("cluster()  returned");
}

char initname[INITNAME_SZ] = "/sbin/init";
char initargs[INITARGS_SZ] = "";

/*
 * Start the initial user process.
 * The program [initname] may be invoked with one argument
 * containing the boot flags.
 *
 * It must be a 32-bit program.
 */
void
icode(void)
{
    proc_t *p = ttoproc(curthread);

    ASSERT_STACK_ALIGNED();

    /*
     * Allocate user address space and stack segment
     */
    proc_init = p;
    zone0.zone_proc_initpid = proc_init->p_pid;

    p->p_cstime = p->p_stime = p->p_cutime = p->p_utime = 0;
    p->p_usrstack = (caddr_t)USRSTACK32;
    p->p_model = DATAMODEL_ILP32;
    p->p_stkprot = PROT_ZFOD & ~PROT_EXEC;
    p->p_datprot = PROT_ZFOD & ~PROT_EXEC;
    p->p_stk_ctl = INT32_MAX;

    p->p_as = as_alloc();
    p->p_as->a_userlimit = (caddr_t)USERLIMIT32;
    (void) hat_setup(p->p_as->a_hat, HAT_INIT);
    init_core();

    init_mstate(curthread, LMS_SYSTEM);

    if (exec_init(initname, 1, initargs[0] == '\0' ? NULL : initargs) != 0)
        halt("Could not start init");

    lwp_rtt();
}

int
exec_init(const char *initpath, int useboothowto, const char *args)
{
    char *ucp;
    caddr32_t *uap;
    char *argv[4];              /* backwards */
    int argc = 0;
    int error = 0, len, count = 0, i;
    proc_t *p = ttoproc(curthread);
    klwp_t *lwp = ttolwp(curthread);

    /*
     * Construct the exec arguments in userland.  That is, make an array
     * of pointers to the argument strings, just like for execv().  This
     * is done backwards.
     */
    ucp = p->p_usrstack;

    argv[0] = NULL;             /* argv terminator */

    if (args != NULL) {
        len = strlen(args) + 1;
        ucp -= len;
        error |= copyoutstr(args, ucp, len, NULL);
        argv[++argc] = ucp;
    }

    if (useboothowto &&
        boothowto & (RB_SINGLE|RB_RECONFIG|RB_VERBOSE)) {
        error |= subyte(--ucp, '\0');       /* trailing null byte */

        if (boothowto & RB_SINGLE)
            error |= subyte(--ucp, 's');
        if (boothowto & RB_RECONFIG)
            error |= subyte(--ucp, 'r');
        if (boothowto & RB_VERBOSE)
            error |= subyte(--ucp, 'v');
        error |= subyte(--ucp, '-');    /* leading hyphen */

        argv[++argc] = ucp;
    }

    len = strlen(initpath) + 1;
    ucp -= len;
    error |= copyoutstr(initpath, ucp, len, NULL);
    argv[++argc] = ucp;

    /*
     * Move out the arg pointers.
     */
    uap = (caddr32_t *)P2ALIGN((uintptr_t)ucp, sizeof (caddr32_t));
    for (i = 0; i < argc + 1; ++i)
        error |= suword32(--uap, (uint32_t)(uintptr_t)argv[i]);

    if (error != 0) {
        zcmn_err(p->p_zone->zone_id, CE_WARN,
            "Could not construct stack for init.\n");
        return (EFAULT);
    }

    /*
     * Point at the arguments.
     */
    lwp->lwp_ap = lwp->lwp_arg;
    lwp->lwp_arg[0] = (uintptr_t)argv[argc];
    lwp->lwp_arg[1] = (uintptr_t)uap;
    lwp->lwp_arg[2] = NULL;
    curthread->t_post_sys = 1;
    curthread->t_sysnum = SYS_execve;

again:
    error = exec_common((const char *)argv[argc], (const char **)uap, NULL);

    /*
     * Normally we would just set lwp_argsaved and t_post_sys and
     * let post_syscall reset lwp_ap for us.  Unfortunately,
     * exec_init isn't always called from a system call.  Instead
     * of making a mess of trap_cleanup, we just reset the args
     * pointer here.
     */
    reset_syscall_args();

    switch (error) {
    case 0:
        return (0);

    case ENOENT:
        zcmn_err(p->p_zone->zone_id, CE_WARN,
            "exec(%s) failed (file not found).\n", initpath);
        return (ENOENT);

    case EAGAIN:
    case EINTR:
        ++count;
        if (count < 5) {
            zcmn_err(p->p_zone->zone_id, CE_WARN,
                "exec(%s) failed with errno %d.  Retrying...\n",
                initpath, error);
            goto again;
        }
    }

    zcmn_err(p->p_zone->zone_id, CE_WARN,
        "exec(%s) failed with errno %d.", initpath, error);
    return (error);
}

void
main(void)
{
    proc_t      *p = ttoproc(curthread);    /* &p0 */
    int     (**initptr)();
    extern void sched();
    extern void fsflush();
    extern void thread_reaper();
    extern int  (*init_tbl[])();
    extern int  (*mp_init_tbl[])();
    extern id_t syscid, defaultcid;
    extern int  swaploaded;
    extern int  netboot;
    extern void vm_init(void);
    extern void cbe_init(void);
    extern void clock_init(void);
    extern void physio_bufs_init(void);
    extern void pm_cfb_setup_intr(void);
    extern int  pm_adjust_timestamps(dev_info_t *, void *);
    extern void start_other_cpus(int);
    extern void sysevent_evc_thrinit();
    extern void lgrp_main_init(void);
    extern void lgrp_main_mp_init(void);

    /*
     * In the horrible world of x86 in-lines, you can't get symbolic
     * structure offsets a la genassym.  This assertion is here so
     * that the next poor slob who innocently changes the offset of
     * cpu_thread doesn't waste as much time as I just did finding
     * out that it's hard-coded in i86/ml/i86.il.  Similarly for
     * curcpup.  You're welcome.
     */
    ASSERT(CPU == CPU->cpu_self);
    ASSERT(curthread == CPU->cpu_thread);
    ASSERT_STACK_ALIGNED();

    /*
     * Setup the first lgroup, and home t0
     */
    lgrp_setup();

    startup();
    segkmem_gc();
    callb_init();
    callout_init(); /* callout table MUST be init'd before clock starts */
    cbe_init();
    clock_init();

    /*
     * May need to probe to determine latencies from CPU 0 after
     * gethrtime() comes alive in cbe_init() and before enabling interrupts
     */
    lgrp_plat_probe();

    /*
     * Call all system initialization functions.
     */
    for (initptr = &init_tbl[0]; *initptr; initptr++)
        (**initptr)();

    /*
     * initialize vm related stuff.
     */
    vm_init();

    /*
     * initialize buffer pool for raw I/O requests
     */
    physio_bufs_init();

    ttolwp(curthread)->lwp_error = 0; /* XXX kludge for SCSI driver */

    /*
     * Drop the interrupt level and allow interrupts.  At this point
     * the DDI guarantees that interrupts are enabled.
     */
    (void) spl0();
    interrupts_unleashed = 1;

    vfs_mountroot();    /* Mount the root file system */
    errorq_init();      /* after vfs_mountroot() so DDI root is ready */
    cpu_kstat_init(CPU);    /* after vfs_mountroot() so TOD is valid */
    ddi_walk_devs(ddi_root_node(), pm_adjust_timestamps, NULL);
                /* after vfs_mountroot() so hrestime is valid */

    post_startup();
    swaploaded = 1;

    /*
     * Initial C2 audit system
     */
#ifdef C2_AUDIT
    audit_init();   /* C2 hook */
#endif

    /*
     * Plumb the protocol modules and drivers only if we are not
     * networked booted, in this case we already did it in rootconf().
     */
    if (netboot == 0)
        (void) strplumb();

    gethrestime(&u.u_start);
    curthread->t_start = u.u_start.tv_sec;
    p->p_mstart = gethrtime();

    /*
     * Perform setup functions that can only be done after root
     * and swap have been set up.
     */
    consconfig();
#if defined(__i386) || defined(__amd64)
    release_bootstrap();
#endif
    /*
     * attach drivers with ddi-forceattach prop
     * This must be done after consconfig() to prevent usb key/mouse
     * from attaching before the upper console stream is plumbed.
     * It must be done early enough to load hotplug drivers (e.g.
     * pcmcia nexus) so that devices enumerated via hotplug is
     * available before I/O subsystem is fully initialized.
     */
    i_ddi_forceattach_drivers();

    /*
     * Set the scan rate and other parameters of the paging subsystem.
     */
    setupclock(0);

    /*
     * Create kmem cache for proc structures
     */
    process_cache = kmem_cache_create("process_cache", sizeof (proc_t),
        0, NULL, NULL, NULL, NULL, NULL, 0);

    /*
     * Initialize process 0's lwp directory and lwpid hash table.
     */
    p->p_lwpdir = p->p_lwpfree = p0_lwpdir;
    p->p_lwpdir->ld_next = p->p_lwpdir + 1;
    p->p_lwpdir_sz = 2;
    p->p_tidhash = p0_tidhash;
    p->p_tidhash_sz = 2;
    p0_lep.le_thread = curthread;
    p0_lep.le_lwpid = curthread->t_tid;
    p0_lep.le_start = curthread->t_start;
    lwp_hash_in(p, &p0_lep);

    /*
     * Initialize extended accounting.
     */
    exacct_init();

    /*
     * Initialize threads of sysevent event channels
     */
    sysevent_evc_thrinit();

    /*
     * main lgroup initialization
     * This must be done after post_startup(), but before
     * start_other_cpus()
     */
    lgrp_main_init();

    /*
     * Perform MP initialization, if any.
     */
    start_other_cpus(0);

    /*
     * Finish lgrp initialization after all CPUS are brought online.
     */
    lgrp_main_mp_init();

    /*
     * After mp_init(), number of cpus are known (this is
     * true for the time being, when there are actually
     * hot pluggable cpus then this scheme  would not do).
     * Any per cpu initialization is done here.
     */
    kmem_mp_init();
    vmem_update(NULL);

    for (initptr = &mp_init_tbl[0]; *initptr; initptr++)
        (**initptr)();

    /*
     * This must be called after start_other_cpus
     */
    pm_cfb_setup_intr();

    /*
     * Make init process; enter scheduling loop with system process.
     */

    /* create init process */
    if (newproc(icode, NULL, defaultcid, 59, NULL))
        panic("main: unable to fork init.");

    /* create pageout daemon */
    if (newproc(pageout, NULL, syscid, maxclsyspri - 1, NULL))
        panic("main: unable to fork pageout()");

    /* create fsflush daemon */
    if (newproc(fsflush, NULL, syscid, minclsyspri, NULL))
        panic("main: unable to fork fsflush()");

    /* create cluster process if we're a member of one */
    if (cluster_bootflags & CLUSTER_BOOTED) {
        if (newproc(cluster_wrapper, NULL, syscid, minclsyspri, NULL))
            panic("main: unable to fork cluster()");
    }

    /*
     * Create system threads (threads are associated with p0)
     */

    /* create thread_reaper daemon */
    (void) thread_create(NULL, 0, (void (*)())thread_reaper,
        NULL, 0, &p0, TS_RUN, minclsyspri);

    /* create module uninstall daemon */
    /* BugID 1132273. If swapping over NFS need a bigger stack */
    (void) thread_create(NULL, 0, (void (*)())mod_uninstall_daemon,
        NULL, 0, &p0, TS_RUN, minclsyspri);

    (void) thread_create(NULL, 0, seg_pasync_thread,
        NULL, 0, &p0, TS_RUN, minclsyspri);

    pid_setmin();

    bcopy("sched", u.u_psargs, 6);
    bcopy("sched", u.u_comm, 5);
    sched();
    /* NOTREACHED */
}