FreeBSD/Linux Kernel Cross Reference
sys/kern/bootstrap.c

     /* 
      * Mach Operating System
      * Copyright (c) 1992-1989 Carnegie Mellon University
      * All Rights Reserved.
      * 
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
      * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /*
     * HISTORY
     * $Log:        bootstrap.c,v $
     * Revision 2.31  93/03/26  17:54:41  mrt
     *      Changed boot_map to be palatable to vm_object_page_map().
     *      ANSIfied (except for varargs functions).
     *      [93/03/23            af]
     * 
     * Revision 2.30  93/03/09  12:26:38  danner
     *      String protos.
     *      [93/03/07            af]
     * 
     * Revision 2.29  93/02/05  07:51:14  danner
     *      Alpha like mips, has machdep init flags.
     *      [93/02/04  01:56:09  af]
     * 
     *      64bit cleanup.  Added a magic number to the boot label.
     *      Changed ovbcopy_ints to be quicker where it can.
     *      [92/11/30            af]
     * 
     * Revision 2.28  92/08/03  17:36:37  jfriedl
     *      removed silly prototypes
     *      [92/08/02            jfriedl]
     * 
     * Revision 2.27  92/05/21  17:12:55  jfriedl
     *      Removed unused variable 'port' from bootstrap_create().
     *      Cleanup to quiet gcc warnings.
     *      [92/05/16            jfriedl]
     * 
     * Revision 2.26  92/05/04  11:26:09  danner
     *      Set load_bootstrap_symbols from bootstrap_symbols option file. 
     *      [92/05/03            danner]
     * 
     * Revision 2.25  92/04/01  19:33:06  rpd
     *      Fixed ovbcopy_ints to handle zero size.
     *      [92/03/13            rpd]
     * 
     * Revision 2.24  92/02/26  13:12:51  elf
     *      Added protect in copy_bootstrap against zero size bss. 
     *      [92/02/26            danner]
     * 
     * Revision 2.23  92/02/19  16:46:30  elf
     *      Change -a switch into -q switch.
     *      Do not load the default-pager's symtable by default,
     *      it gets in the way of debugging UX.
     *      [92/02/10  17:50:23  af]
     * 
     * Revision 2.22  92/02/18  18:00:12  elf
     *      Added global load_fault_in_text to force the faulting in of the
     *      bootstrap task text. Useful for debugging.
     *      [92/02/14            danner]
     * 
     * Revision 2.21  92/01/03  20:13:43  dbg
     *      Move bootstrap code out to user space.
     *      Mac2 and iPSC-dependent code must be moved there also.
     *      [91/12/18            dbg]
     * 
     * Revision 2.20  91/12/10  16:32:40  jsb
     *      Fixes from Intel
     *      [91/12/10  15:51:50  jsb]
     * 
     * Revision 2.19  91/11/12  11:51:53  rvb
     *      Added task_insert_send_right.
     *      Changed BOOTSTRAP_MAP_SIZE to 4 meg.
     *      [91/11/12            rpd]
     * 
     * Revision 2.18  91/09/12  16:37:49  bohman
     *      Made bootstrap task call mac2 machine dependent code before running
     *      'startup', which is loaded from the UX file system.  This needs to
     *      be handled more generally in the future.
     *      [91/09/11  17:07:59  bohman]
     * 
     * Revision 2.17  91/08/28  11:14:22  jsb
     *      Changed msgh_kind to msgh_seqno.
    *      [91/08/10            rpd]
    * 
    * Revision 2.16  91/08/03  18:18:45  jsb
    *      Moved bootstrap query earlier. Removed all NORMA specific code.
    *      [91/07/25  18:25:35  jsb]
    * 
    * Revision 2.15  91/07/31  17:44:14  dbg
    *      Pass host port to boot_load_program and read_emulator_symbols.
    *      [91/07/30  17:02:40  dbg]
    * 
    * Revision 2.14  91/07/01  08:24:54  jsb
    *      Removed notion of master/slave. Instead, refuse to start up
    *      a bootstrap task whenever startup_name is null.
    *      [91/06/29  16:48:14  jsb]
    * 
    * Revision 2.13  91/06/19  11:55:57  rvb
    *      Ask for startup program to override default.
    *      [91/06/18  21:39:17  rvb]
    * 
    * Revision 2.12  91/06/17  15:46:51  jsb
    *      Renamed NORMA conditionals.
    *      [91/06/17  10:49:04  jsb]
    * 
    * Revision 2.11  91/06/06  17:06:53  jsb
    *      Allow slaves to act as masters (for now).
    *      [91/05/13  17:36:17  jsb]
    * 
    * Revision 2.10  91/05/18  14:31:32  rpd
    *      Added argument to kernel_thread.
    *      [91/04/03            rpd]
    * 
    * Revision 2.9  91/05/14  16:40:06  mrt
    *      Correcting copyright
    * 
    * Revision 2.8  91/02/05  17:25:42  mrt
    *      Changed to new Mach copyright
    *      [91/02/01  16:11:22  mrt]
    * 
    * Revision 2.7  90/12/14  11:01:58  jsb
    *      Changes to NORMA_BOOT support. Use real device port, not a proxy;
    *      new device forwarding code handles forwarding of requests.
    *      Have slave not bother starting bootstrap task if there is nothing
    *      for it to run.
    *      [90/12/13  21:37:57  jsb]
    * 
    * Revision 2.6  90/09/28  16:55:30  jsb
    *      Added NORMA_BOOT support.
    *      [90/09/28  14:04:43  jsb]
    * 
    * Revision 2.5  90/06/02  14:53:39  rpd
    *      Load emulator symbols.
    *      [90/05/11  16:58:37  rpd]
    * 
    *      Made bootstrap_task available externally.
    *      [90/04/05            rpd]
    *      Converted to new IPC.
    *      [90/03/26  22:03:39  rpd]
    * 
    * Revision 2.4  90/01/11  11:43:02  dbg
    *      Initialize bootstrap print routines.  Remove port number
    *      printout.
    *      [89/12/20            dbg]
    * 
    * Revision 2.3  89/11/29  14:09:01  af
    *      Enlarged the bootstrap task's map to accomodate some unnamed
    *      greedy RISC box.  Sigh.
    *      [89/11/07            af]
    *      Made root_name and startup_name non-preallocated, so that
    *      they can be changed at boot time on those machines like
    *      mips and Sun where the boot loader passes command line
    *      arguments to the kernel.
    *      [89/10/28            af]
    * 
    * Revision 2.2  89/09/08  11:25:02  dbg
    *      Pass root partition name to default_pager_setup.
    *      [89/08/31            dbg]
    * 
    *      Assume that device service has already been created.
    *      Create bootstrap task here and give it the host and
    *      device ports.
    *      [89/08/01            dbg]
    * 
    *      Call default_pager_setup.
    *      [89/07/11            dbg]
    * 
    * 12-Apr-89  David Golub (dbg) at Carnegie-Mellon University
    *      Removed console_port.
    *
    */
   /*
    * Bootstrap the various built-in servers.
    */
   #include <mach_kdb.h>
   #include <bootstrap_symbols.h>
   
   #include <mach/port.h>
   #include <mach/message.h>
   #include <mach/vm_param.h>
   #include <ipc/ipc_port.h>
   #include <kern/host.h>
   #include <kern/strings.h>
   #include <kern/task.h>
   #include <kern/thread.h>
   #include <vm/vm_kern.h>
   #include <device/device_port.h>
   
   #include <sys/varargs.h>
   
   #include <mach/boot_info.h>
   
   #if     MACH_KDB
   #include <machine/db_machdep.h>
   #include <ddb/db_sym.h>
   #endif
   
   /*
    *      Bootstrap image is moved out of BSS at startup.
    */
   
   vm_offset_t     boot_start = 0;         /* pointer to bootstrap image */
   vm_size_t       boot_size = 0;          /* size of bootstrap image */
   vm_offset_t     load_info_start = 0;    /* pointer to bootstrap load info */
   vm_size_t       load_info_size = 0;     /* size of bootstrap load info */
   vm_offset_t     kern_sym_start = 0;     /* pointer to kernel symbols */
   vm_size_t       kern_sym_size = 0;      /* size of kernel symbols */
   
   #if     DEBUG
   load_info_print()
   {
           struct loader_info *lp = (struct loader_info *)load_info_start;
   
           printf("Load info: text (%#x, %#x, %#x)\n",
                   lp->text_start, lp->text_size, lp->text_offset);
           printf("           data (%#x, %#x, %#x)\n",
                   lp->data_start, lp->data_size, lp->data_offset);
           printf("           bss  (%#x)\n", lp->bss_size);
           printf("           syms (%#x, %#x)\n",
                   lp->sym_offset, lp->sym_size);
           printf("           entry(%#x, %#x)\n",
                   lp->entry_1, lp->entry_2);
   }
   #endif
   
   /*
    *      Moves kernel symbol table, bootstrap image, and bootstrap
    *      load information out of BSS at startup.  Returns the
    *      first unused address.
    *
    *      PAGE_SIZE must be set.
    *
    *      On some machines, this code must run before the page
    *      tables are set up, and therefore must be re-created
    *      in assembly language.
    */
   
   void
   ovbcopy_ints(
           vm_offset_t src,
           vm_offset_t dst,
           vm_size_t   size)
   {
           register vm_size_t *srcp;
           register vm_size_t *dstp;
           register unsigned int count;
   
           srcp = (vm_size_t *)(src + size);
           dstp = (vm_size_t *)(dst + size);
           count = size / sizeof(vm_size_t);
   
           while (count-- != 0)
               *--dstp = *--srcp;
   }
   
   extern char     edata[];        /* start of BSS */
   extern char     end[];          /* end of BSS */
   
   vm_offset_t
   move_bootstrap()
   {
           register struct boot_info *bi = (struct boot_info *)edata;
   
           /*
            * Tolerate some "imprecision" in a certain linker
            */
           if (bi->magic_number != MACH_BOOT_INFO_MAGIC) {
                   register vm_size_t      *addr, *erange;
   
                   addr   = (vm_size_t *)edata;
                   erange = (vm_size_t *)(edata + PAGE_SIZE);
                   while (addr < erange) {
                           bi = (struct boot_info *) ++addr;
                           if (bi->magic_number == MACH_BOOT_INFO_MAGIC)
                                   break;
                   }
                   if (bi->magic_number != MACH_BOOT_INFO_MAGIC)
                           return 0;       /* good luck.. */
           }
   
           kern_sym_start = (vm_offset_t) end;
           kern_sym_size  = bi->sym_size;
           /*
            * Align start of bootstrap on page boundary,
            * to allow mapping into user space.
            */
           boot_start = round_page(kern_sym_start + kern_sym_size);
           boot_size  = bi->boot_size;
           load_info_start = boot_start + boot_size;
           load_info_size  = bi->load_info_size;
   
           ovbcopy_ints((vm_offset_t)bi + sizeof(struct boot_info) + kern_sym_size,
                        boot_start,
                        boot_size + load_info_size);
   
           ovbcopy_ints((vm_offset_t)bi + sizeof(struct boot_info),
                        kern_sym_start,
                        kern_sym_size);
   
           return boot_start + boot_size + load_info_size;
   }
   
   /*
   
    */
   mach_port_t     boot_device_port;       /* local name */
   mach_port_t     boot_host_port;         /* local name */
   
   void    user_bootstrap();       /* forward */
   
   extern char     *root_name;
   
   mach_port_t
   task_insert_send_right(
           task_t task,
           ipc_port_t port)
   {
           mach_port_t name;
   
           for (name = 1;; name++) {
                   kern_return_t kr;
   
                   kr = mach_port_insert_right(task->itk_space, name,
                               (ipc_object_t)port, MACH_MSG_TYPE_PORT_SEND);
                   if (kr == KERN_SUCCESS)
                           break;
                   assert(kr == KERN_NAME_EXISTS);
           }
   
           return name;
   }
   
   void bootstrap_create()
   {
           task_t          bootstrap_task;
           thread_t        bootstrap_thread;
   
           if (boot_size == 0) {
                   printf("Not starting bootstrap task.\n");
                   return;
           }
   
           /*
            * Create the bootstrap task.
            */
   
           (void) task_create(TASK_NULL, FALSE, &bootstrap_task);
           (void) thread_create(bootstrap_task, &bootstrap_thread);
   
           /*
            * Insert send rights to the master host and device ports.
            */
   
           boot_host_port =
                   task_insert_send_right(bootstrap_task,
                           ipc_port_make_send(realhost.host_priv_self));
   
           boot_device_port =
                   task_insert_send_right(bootstrap_task,
                           ipc_port_make_send(master_device_port));
   
           /*
            * Start the bootstrap thread.
            */
           thread_start(bootstrap_thread, user_bootstrap);
           (void) thread_resume(bootstrap_thread);
   }
   
   /*
    * The following code runs as the kernel mode portion of the
    * first user thread.
    */
   
   /*
    * Convert an unsigned integer to its decimal representation.
    */
   void
   itoa(
           char            *str,
           vm_size_t       num)
   {
           char    buf[sizeof(vm_size_t)*2+3];
           register char *np;
   
           np = buf + sizeof(buf);
           *--np = 0;
   
           do {
               *--np = '' + num % 10;
               num /= 10;
           } while (num != 0);
   
           strcpy(str, np);
   }
   
   /*
    * Parse the boot flags into an argument string.
    * Format as a standard flag argument: '-qsdn...'
    */
   #include <sys/reboot.h>
   
   static void
   get_boot_flags(
           char    str[])  /* OUT */
   {
           register char *cp;
           register int    bflag;
   
   #if     defined(mips) || defined(alpha)
   
           extern char *machine_get_boot_flags();
           cp = machine_get_boot_flags(str);
   #else
           cp = str;
           *cp++ = '-';
   #endif
   
           bflag = boothowto;
   
           if (bflag & RB_ASKNAME)
               *cp++ = 'q';
           if (bflag & RB_SINGLE)
               *cp++ = 's';
   #if     MACH_KDB
           if (bflag & RB_KDB)
               *cp++ = 'd';
   #endif  MACH_KDB
           if (bflag & RB_INITNAME)
               *cp++ = 'n';
   
           if (cp == &str[1])      /* no flags */
               *cp++ = 'x';
           *cp = '\0';
   }
   
   /*
    * Copy boot_data (executable) to the user portion of this task.
    */
   boolean_t       load_protect_text = TRUE;
   #if MACH_KDB
                   /* if set, fault in the text segment */
   boolean_t       load_fault_in_text = TRUE;
   #endif
   
   vm_offset_t
   boot_map(
           void *          data,   /* private data */
           vm_offset_t     offset) /* offset to map */
   {
           vm_offset_t     start_offset = (vm_offset_t) data;
   
           return pmap_extract(kernel_pmap, start_offset + offset);
   }
   
   
   #if BOOTSTRAP_SYMBOLS
   boolean_t load_bootstrap_symbols = TRUE;
   #else
   boolean_t load_bootstrap_symbols = FALSE;
   #endif
   
   
   
   void
   copy_bootstrap(
           vm_offset_t             *entry)
   {
           struct loader_info      *lp;
           vm_offset_t             text_page_start,
                                   text_page_end,
                                   data_page_start,
                                   bss_start,
                                   bss_page_start,
                                   bss_page_end;
   
           register vm_map_t       user_map = current_task()->map;
           vm_object_t             boot_object;
           vm_size_t               bss_size;
   
           /*
            * Point to bootstrap load information.
            */
           lp = (struct loader_info *)load_info_start;
   
           /*
            * We assume that makeboot has aligned the various
            * pieces of the bootstrap image on page boundaries.
            */
           assert(lp->text_start == trunc_page(lp->text_start));
           assert(lp->data_start == trunc_page(lp->data_start));
           assert(lp->text_offset == trunc_page(lp->text_offset));
           assert(lp->data_offset == trunc_page(lp->data_offset)
               || lp->data_offset == lp->text_offset + lp->text_size);
   
           /*
            * Find how much virtual space we have to allocate.
            */
           text_page_start = trunc_page(lp->text_start);
           text_page_end   = round_page(lp->text_start + lp->text_size);
           data_page_start = trunc_page(lp->data_start);
           bss_start       = lp->data_start + lp->data_size;
           bss_page_start  = trunc_page(bss_start);
           bss_page_end    = round_page(bss_start + lp->bss_size);
           bss_size        = bss_page_end - bss_page_start;
   
   
           /*
            * Create an object that maps the pages in the
            * bootstrap image.  Map only until the end of the last
            * whole page.
            */
           boot_size = lp->data_offset + bss_page_start - lp->data_start;
           boot_object = vm_object_allocate(boot_size);
           vm_object_page_map(boot_object,
                              (vm_offset_t) 0,     /* from boot_start */
                              boot_size,
                              boot_map,
                              (char *)boot_start);
   
           /*
            * Map the text and data from the boot image into
            * the user task.  Map the data area only through
            * the last whole page of data - the next page of
            * data is split between data and bss, and must be
            * partially cleared.
            */
   
           if (text_page_end >= data_page_start) {
               /*
                * One contiguous area for text and data.
                */
               (void) vm_map_enter(user_map,
                           &text_page_start,
                           (vm_size_t) (bss_page_start - text_page_start),
                           (vm_offset_t) 0, FALSE,
                           boot_object,
                           lp->text_offset,
                           FALSE,
                           VM_PROT_READ | VM_PROT_WRITE,
                           VM_PROT_ALL,
                           VM_INHERIT_DEFAULT);
   
           }
           else {
               /*
                * Separated text and data areas.
                */
               (void) vm_map_enter(user_map,
                           &text_page_start,
                           (vm_size_t)(text_page_end - text_page_start),
                           (vm_offset_t) 0, FALSE,
                           boot_object,
                           lp->text_offset,
                           FALSE,
                           VM_PROT_READ | VM_PROT_WRITE,
                           VM_PROT_ALL,
                           VM_INHERIT_DEFAULT);
   
               (void) vm_map_enter(user_map,
                           &data_page_start,
                           (vm_size_t)(bss_page_start - data_page_start),
                           (vm_offset_t) 0, FALSE,
                           boot_object,
                           lp->data_offset,
                           FALSE,
                           VM_PROT_READ | VM_PROT_WRITE,
                           VM_PROT_ALL,
                           VM_INHERIT_DEFAULT);
           }
   
   
           /*
            * Allocate the remainder of the data segment and all
            * of the BSS. Protect against zero size bss.
            */
           if (bss_size)
             {
               (void) vm_allocate(user_map, &bss_page_start, 
                                  (vm_size_t)(bss_size), FALSE);
   
               /*
                * If the data segment does not end on a VM page boundary,
                * we copy the end of the data segment onto a new page
                * so that the bss segment will be zero, and so that
                * we do not overwrite the bootstrap symbol table.
                */
               if (bss_start > bss_page_start) {
                 (void) copyout((char *) boot_start +
                                lp->data_offset +
                                lp->data_size -
                                (bss_start - bss_page_start),
                                (char *)bss_page_start,
                                bss_start - bss_page_start);
               }
             } 
   
           /*
            * Protect the text.
            */
           if (load_protect_text)
               (void) vm_protect(user_map,
                           text_page_start,
                           (vm_size_t)(trunc_page(lp->text_start+lp->text_size)
                                   - text_page_start),
                           FALSE,
                           VM_PROT_READ|VM_PROT_EXECUTE);
   
   #if     MACH_KDB
           /*
            * Enter the bootstrap symbol table.
            */
   
           if (load_bootstrap_symbols)
           (void) X_db_sym_init(
                   (char*) boot_start+lp->sym_offset,
                   (char*) boot_start+lp->sym_offset+lp->sym_size,
                   "bootstrap",
                   (char *) user_map);
   
           if (load_fault_in_text)
             {
               vm_offset_t lenp = round_page(lp->text_start+lp->text_size) -
                                trunc_page(lp->text_start);
               vm_offset_t i = 0;
   
               while (i < lenp)
                 {
                   vm_fault(user_map, text_page_start +i, 
                           load_protect_text ?  
                            VM_PROT_READ|VM_PROT_EXECUTE :
                            VM_PROT_READ|VM_PROT_EXECUTE | VM_PROT_WRITE,
                            0,0,0);
                   i = round_page (i+1);
                 }
             }
   
   
   #endif  MACH_KDB
           /*
            * Return the entry points.
            */
           entry[0] = lp->entry_1;
           entry[1] = lp->entry_2;
   }
   
   /*
    * Allocate the stack, and build the argument list.
    */
   extern vm_offset_t      user_stack_low();
   extern vm_offset_t      set_user_regs();
   
   void
   build_args_and_stack(entry, va_alist)
           vm_offset_t     entry;
           va_dcl
   {
           vm_offset_t     stack_base;
           vm_size_t       stack_size;
           va_list         argv_ptr;
           register
           char *          arg_ptr;
           int             arg_len;
           int             arg_count;
           register
           char *          arg_pos;
           int             arg_item_len;
           char *          string_pos;
           char *          zero = (char *)0;
   
   #define STACK_SIZE      (64*1024)
   
           /*
            * Calculate the size of the argument list.
            */
           va_start(argv_ptr);
           arg_len = 0;
           arg_count = 0;
           for (;;) {
               arg_ptr = va_arg(argv_ptr, char *);
               if (arg_ptr == 0)
                   break;
               arg_count++;
               arg_len += strlen(arg_ptr) + 1;
           }
           va_end(argv_ptr);
   
           /*
            * Add space for:
            *      arg count
            *      pointers to arguments
            *      trailing 0 pointer
            *      dummy 0 pointer to environment variables
            *      and align to integer boundary
            */
           arg_len += sizeof(integer_t)
                    + (2 + arg_count) * sizeof(char *);
           arg_len = (arg_len + sizeof(integer_t) - 1) & ~(sizeof(integer_t)-1);
   
           /*
            * Allocate the stack.
            */
           stack_size = round_page(STACK_SIZE);
           stack_base = user_stack_low(stack_size);
           (void) vm_allocate(current_task()->map,
                           &stack_base,
                           stack_size,
                           FALSE);
   
           arg_pos = (char *)
                   set_user_regs(stack_base, stack_size, entry, arg_len);
   
           /*
            * Start the strings after the arg-count and pointers
            */
           string_pos = arg_pos
                   + sizeof(integer_t)
                   + arg_count * sizeof(char *)
                   + 2 * sizeof(char *);
   
           /*
            * first the argument count
            */
           (void) copyout((char *)&arg_count,
                           arg_pos,
                           sizeof(integer_t));
           arg_pos += sizeof(integer_t);
   
           /*
            * Then the strings and string pointers for each argument
            */
           va_start(argv_ptr);
           while (--arg_count >= 0) {
               arg_ptr = va_arg(argv_ptr, char *);
               arg_item_len = strlen(arg_ptr) + 1; /* include trailing 0 */
   
               /* set string pointer */
               (void) copyout((char *)&string_pos,
                           arg_pos,
                           sizeof (char *));
               arg_pos += sizeof(char *);
   
               /* copy string */
               (void) copyout(arg_ptr, string_pos, arg_item_len);
               string_pos += arg_item_len;
           }
           va_end(argv_ptr);
   
           /*
            * last, the trailing 0 argument and a null environment pointer.
            */
           (void) copyout((char *)&zero, arg_pos, sizeof(char *));
           arg_pos += sizeof(char *);
           (void) copyout((char *)&zero, arg_pos, sizeof(char *));
   }
   
   void user_bootstrap()
   {
           vm_offset_t     entry[2];
   
           char    host_string[12];
           char    device_string[12];
           char    flag_string[12];
   
           /*
            * Copy the bootstrap code from boot_data to the user task.
            */
           copy_bootstrap(entry);
   
           /*
            * Convert the host and device ports to strings,
            * to put in the argument list.
            */
           itoa(host_string, boot_host_port);
           itoa(device_string, boot_device_port);
   
           /*
            * Get the boot flags, also
            */
           get_boot_flags(flag_string);
   
           /*
            * Build the argument list and insert in the user task.
            * Argument list is
            * "bootstrap -<boothowto> <host_port> <device_port> <root_name>"
            */
           build_args_and_stack(entry,
                           "bootstrap",
                           flag_string,
                           host_string,
                           device_string,
                           root_name,
                           (char *)0);
   
           /*
            * Exit to user thread.
            */
           thread_bootstrap_return();
           /*NOTREACHED*/
   }
   

Cache object: 3b9453ce8e82716744515861e85d216a