FreeBSD/Linux Kernel Cross Reference
sys/sqt/setconf.c

     /* 
      * Mach Operating System
      * Copyright (c) 1991 Carnegie Mellon University
      * Copyright (c) 1991 Sequent Computer Systems
      * 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 AND SEQUENT COMPUTER SYSTEMS ALLOW FREE USE OF
     * THIS SOFTWARE IN ITS "AS IS" CONDITION.  CARNEGIE MELLON AND
     * SEQUENT COMPUTER SYSTEMS DISCLAIM 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:        setconf.c,v $
     * Revision 2.4  93/05/18  11:42:50  rvb
     *      Lint
     * 
     * Revision 2.3  91/07/31  18:03:39  dbg
     *      Changed copyright.
     *      Moved root_name string out of text segment.
     *      [91/07/31            dbg]
     * 
     * Revision 2.2  91/05/08  12:58:47  dbg
     *      Adapted for pure Mach kernel.
     *      [90/10/09            dbg]
     * 
     */
    
    /*
     * $Header: setconf.c,v 2.4 93/05/18 11:42:50 rvb Exp $
     */
    
    /*
     * Revision 1.1  89/11/14  18:35:23  root
     * Initial revision
     * 
     * Revision 1.2  89/08/16  15:17:31  root
     * balance -> sqt
     * 
     * Revision 1.1  89/07/05  13:17:37  kak
     * Initial revision
     * 
     * Revision 2.2  88/03/20  17:32:11  bak
     * removed xp entry from genericconf structure. xp not supported in symmetry.
     * 
     */
    #include <mach/boolean.h>
    
    #include <sqt/cfg.h>
    #include <sqt/vm_defs.h>
    
    char    root_name_string[16] = "\0\0\0\0\0\0\0";        /* at least ddNNp */
    char    *root_name = root_name_string;
    
    #define MINARGLEN       5
    
    /*
     * The generic rootdev is passed into the kernel as the
     * 1st argument in the boot name. The argument specifies the device and
     * unit number to use for the rootdev. The actual partitions to be used for
     * a given device is specified in ../conf/conf_generic.c.
     * The argument string is in the form:
     *              XXds            (eg. sd0a)
     *
     *      where   XX is the device type (e.g. sd for scsi disk),
     *              d  is the Dynix device unit number,
     *              s is the Dynix device slice (a-g)
     */
    
    setconf()
    {
            register struct genericconf *gc;
            register char *boot_name;
            register char *name;
    
            /*
             * Find Generic rootdev string.
             *
             * Skip past bootname, then till argument string.
             * If argument string missing, use boot device name.
             */
    
           boot_name = PHYSTOKV(va_CD_LOC->c_boot_name, char *);
   
           for (name = boot_name; *name != '\0'; name++)
                   continue;
           while ((*name == '\0') && (name < &boot_name[BNAMESIZE]))
                   name++;
           if (name > &boot_name[BNAMESIZE-MINARGLEN]) {
                   boot_name[BNAMESIZE-1] = '\0';
   
                   /*
                    * Use boot name prefix.
                    * zd(0,0) becomes zd0a.
                    */
                   name = boot_name;
                   root_name[0] = name[0];
                   root_name[1] = name[1];
                   if (name[2] != '(')
                           goto error;
                   root_name[2] = name[3];
                   if (name[4] != ',')
                           goto error;
                   root_name[3] = name[5] - '' + 'a';
           }
           else {
                   strncpy(root_name, name, 5);
           }
           root_name[4] = '\0';
   
           printf("Root on %s.\n", root_name);
           return;
   
   error:
           printf("Generic root device ");
           if (*name == '')
                   printf("not specified.\n");
           else
                   printf("\"%s\" is incorrect.\n", name);
   
           printf("Returning to firmware\n");
           return_fw(FALSE);
   }
   

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