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boot.c revision 1.2.14.1 
      1 /*	$NetBSD: boot.c,v 1.2.14.1 2000/11/20 20:18:22 bouyer Exp $	*/
      2 /*
      3  * Copyright (c) 1994 Rolf Grossmann
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *      This product includes software developed by Rolf Grossmann.
     17  * 4. The name of the author may not be used to endorse or promote products
     18  *    derived from this software without specific prior written permission
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/param.h>
     33 #include <sys/reboot.h>
     34 
     35 #include <lib/libsa/stand.h>
     36 #include <lib/libkern/libkern.h>
     37 
     38 #include <machine/cpu.h>        /* for NEXT_RAMBASE */
     39 
     40 #define LOADADDR        (char *)NEXT_RAMBASE
     41 
     42 extern int errno;
     43 
     44 /*
     45  * Boot device is derived from PROM provided information.
     46  */
     47 
     48 extern char *bootprog_rev;
     49 extern char *bootprog_name;
     50 extern int build;
     51 #define KNAMEN 100
     52 char kernel[KNAMEN];
     53 char *entry_point;		/* return value filled in by machdep_start */
     54 
     55 extern void rtc_init(void);
     56 
     57 extern int try_bootp;
     58 
     59 char *
     60 main(char *boot_arg)
     61 {
     62     printf(">> %s BOOT [%s #%d]\n", bootprog_name, bootprog_rev, build);
     63     rtc_init();
     64 
     65     try_bootp = 1;
     66 
     67 #if 0
     68     printf("Press return to continue.\n");
     69     getchar();
     70 #endif
     71 
     72     strcpy(kernel, boot_arg);
     73     entry_point = NULL;
     74 
     75     while (1) {
     76 	errno = 0;
     77 	exec(kernel, LOADADDR, 0);
     78 	if (errno == ENOEXEC && entry_point != NULL) {
     79           printf("Kernel loaded at 0x%lx\n",(unsigned long)entry_point);
     80 #if 0
     81           printf("Press return to continue.\n");
     82           getchar();
     83 #endif
     84           return entry_point;
     85         }
     86 
     87 	printf("load of %s: %s\n", kernel, strerror(errno));
     88 	printf("boot: ");
     89 	gets(kernel);
     90 	/* XXX we have to write this back into boot_arg or even mg->boot* */
     91 	if (kernel[0] == '\0')
     92 		return NULL;
     93     }
     94 }
     95