common/os/main.c

	main.c revision 018afb24c783bb6053481a3b0f9fbe8e4c583c8e
/*
 * 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 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#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/ddi_timer.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 <sys/brand.h>
#include <sys/mmapobj.h>

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

#include <c2/audit.h>
#include <sys/bootprops.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];
tidhash_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";  /* also referenced by zone0 */
char initargs[BOOTARGS_MAX] = "";       /* also referenced by zone0 */
extern int64_t lwp_sigmask(int, uint_t, uint_t);

/*
 * Construct a stack for init containing the arguments to it, then
 * pass control to exec_common.
 */
int
exec_init(const char *initpath, const char *args)
{
    caddr32_t ucp;
    caddr32_t *uap;
    caddr32_t *argv;
    caddr32_t exec_fnamep;
    char *scratchargs;
    int i, sarg;
    size_t argvlen, alen;
    boolean_t in_arg;
    int argc = 0;
    int error = 0, count = 0;
    proc_t *p = ttoproc(curthread);
    klwp_t *lwp = ttolwp(curthread);
    int brand_action;

    if (args == NULL)
        args = "";

    alen = strlen(initpath) + 1 + strlen(args) + 1;
    scratchargs = kmem_alloc(alen, KM_SLEEP);
    (void) snprintf(scratchargs, alen, "%s %s", initpath, args);

    /*
     * We do a quick two state parse of the string to sort out how big
     * argc should be.
     */
    in_arg = B_FALSE;
    for (i = 0; i < strlen(scratchargs); i++) {
        if (scratchargs[i] == ' ' || scratchargs[i] == '\0') {
            if (in_arg) {
                in_arg = B_FALSE;
                argc++;
            }
        } else {
            in_arg = B_TRUE;
        }
    }
    argvlen = sizeof (caddr32_t) * (argc + 1);
    argv = kmem_zalloc(argvlen, KM_SLEEP);

    /*
     * We pull off a bit of a hack here.  We work our way through the
     * args string, putting nulls at the ends of space delimited tokens
     * (boot args don't support quoting at this time).  Then we just
     * copy the whole mess to userland in one go.  In other words, we
     * transform this: "init -s -r\0" into this on the stack:
     *
     *  -0x00 \0
     *  -0x01 r
     *  -0x02 -  <--------.
     *  -0x03 \0      |
     *  -0x04 s       |
     *  -0x05 -  <------. |
     *  -0x06 \0    | |
     *  -0x07 t     | |
     *  -0x08 i     | |
     *  -0x09 n     | |
     *  -0x0a i  <---.  | |
     *  -0x10 NULL   |  | | (argv[3])
     *  -0x14   -----|--|-' (argv[2])
     *  -0x18  ------|--'   (argv[1])
     *  -0x1c -------'      (argv[0])
     *
     * Since we know the value of ucp at the beginning of this process,
     * we can trivially compute the argv[] array which we also need to
     * place in userland: argv[i] = ucp - sarg(i), where ucp is the
     * stack ptr, and sarg is the string index of the start of the
     * argument.
     */
    ucp = (caddr32_t)(uintptr_t)p->p_usrstack;

    argc = 0;
    in_arg = B_FALSE;
    sarg = 0;

    for (i = 0; i < alen; i++) {
        if (scratchargs[i] == ' ' || scratchargs[i] == '\0') {
            if (in_arg == B_TRUE) {
                in_arg = B_FALSE;
                scratchargs[i] = '\0';
                argv[argc++] = ucp - (alen - sarg);
            }
        } else if (in_arg == B_FALSE) {
            in_arg = B_TRUE;
            sarg = i;
        }
    }
    ucp -= alen;
    error |= copyout(scratchargs, (caddr_t)(uintptr_t)ucp, alen);

    uap = (caddr32_t *)P2ALIGN((uintptr_t)ucp, sizeof (caddr32_t));
    uap--;  /* advance to be below the word we're in */
    uap -= (argc + 1);  /* advance argc words down, plus one for NULL */
    error |= copyout(argv, uap, argvlen);

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

    exec_fnamep = argv[0];
    kmem_free(argv, argvlen);
    kmem_free(scratchargs, alen);

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

    /*
     * If we are executing init from zsched, we may have inherited its
     * parent process's signal mask.  Clear it now so that we behave in
     * the same way as when started from the global zone.
     */
    (void) lwp_sigmask(SIG_UNBLOCK, 0xffffffff, 0xffffffff);

    brand_action = ZONE_IS_BRANDED(p->p_zone) ? EBA_BRAND : EBA_NONE;
again:
    error = exec_common((const char *)(uintptr_t)exec_fnamep,
        (const char **)(uintptr_t)uap, NULL, brand_action);

    /*
     * 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);
}

/*
 * This routine does all of the common setup for invoking init; global
 * and non-global zones employ this routine for the functionality which is
 * in common.
 *
 * This program (init, presumably) must be a 32-bit process.
 */
int
start_init_common()
{
    proc_t *p = curproc;
    ASSERT_STACK_ALIGNED();
    p->p_zone->zone_proc_initpid = p->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_proc = p;
    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);
    return (exec_init(p->p_zone->zone_initname, p->p_zone->zone_bootargs));
}

/*
 * Start the initial user process for the global zone; once running, if
 * init should subsequently fail, it will be automatically be caught in the
 * exit(2) path, and restarted by restart_init().
 */
static void
start_init(void)
{
    proc_init = curproc;

    ASSERT(curproc->p_zone->zone_initname != NULL);

    if (start_init_common() != 0)
        halt("unix: Could not start init");
    lwp_rtt();
}

void
main(void)
{
    proc_t      *p = ttoproc(curthread);    /* &p0 */
    int     (**initptr)();
    extern void sched();
    extern void fsflush();
    extern int  (*init_tbl[])();
    extern int  (*mp_init_tbl[])();
    extern id_t syscid, defaultcid;
    extern int  swaploaded;
    extern int  netboot;
    extern ib_boot_prop_t *iscsiboot_prop;
    extern void vm_init(void);
    extern void cbe_init_pre(void);
    extern void cbe_init(void);
    extern void clock_tick_init_pre(void);
    extern void clock_tick_init_post(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();
#if defined(__x86)
    extern void fastboot_post_startup(void);
#endif
    /*
     * 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 root lgroup and leaf lgroup for CPU 0
     */
    lgrp_init(LGRP_INIT_STAGE2);

    /*
     * Once 'startup()' completes, the thread_reaper() daemon would be
     * created(in thread_init()). After that, it is safe to create threads
     * that could exit. These exited threads will get reaped.
     */
    startup();
    segkmem_gc();
    callb_init();
    cbe_init_pre(); /* x86 must initialize gethrtimef before timer_init */
    timer_init();   /* timer must be initialized before cyclic starts */
    cbe_init();
    callout_init(); /* callout table MUST be init'd after cyclics */
    clock_tick_init_pre();
    clock_init();

    /*
     * On some platforms, clkinitf() changes the timing source that
     * gethrtime_unscaled() uses to generate timestamps.  cbe_init() calls
     * clkinitf(), so re-initialize the microstate counters after the
     * timesource has been chosen.
     */
    init_mstate(&t0, LMS_SYSTEM);
    init_cpu_mstate(CPU, CMS_SYSTEM);

    /*
     * May need to probe to determine latencies from CPU 0 after
     * gethrtime() comes alive in cbe_init() and before enabling interrupts
     * and copy and release any temporary memory allocated with BOP_ALLOC()
     * before release_bootstrap() frees boot memory
     */
    lgrp_init(LGRP_INIT_STAGE3);

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

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

    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;

    /*
     * Initialize Solaris Audit Subsystem
     */
    audit_init();

    /*
     * 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 && iscsiboot_prop == NULL)
        (void) strplumb();

    gethrestime(&PTOU(curproc)->u_start);
    curthread->t_start = PTOU(curproc)->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();
#ifndef __sparc
    release_bootstrap();
#endif

    /*
     * attach drivers with ddi-forceattach prop
     * 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);

    /*
     * 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, p0_tidhash, 2, 0);

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

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

    /*
     * This must be done after post_startup() but before
     * start_other_cpus()
     */
    lgrp_init(LGRP_INIT_STAGE4);

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

#ifdef  __sparc
    /*
     * Release bootstrap here since PROM interfaces are
     * used to start other CPUs above.
     */
    release_bootstrap();
#endif

    /*
     * Finish lgrp initialization after all CPUS are brought online.
     */
    lgrp_init(LGRP_INIT_STAGE5);

    /*
     * 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);

    clock_tick_init_post();

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

    /*
     * These must be called after start_other_cpus
     */
    pm_cfb_setup_intr();
#if defined(__x86)
    fastboot_post_startup();
#endif

    /*
     * Make init process; enter scheduling loop with system process.
     *
     * Note that we manually assign the pids for these processes, for
     * historical reasons.  If more pre-assigned pids are needed,
     * FAMOUS_PIDS will have to be updated.
     */

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

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

    /* create fsflush daemon */
    if (newproc(fsflush, NULL, syscid, minclsyspri, NULL,
        FAMOUS_PID_FSFLUSH))
        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, 0)) {
            panic("main: unable to fork cluster()");
        }
    }

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

    /* 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", PTOU(curproc)->u_psargs, 6);
    bcopy("sched", PTOU(curproc)->u_comm, 5);
    sched();
    /* NOTREACHED */
}