NetBSD/sys/arch/pmax/stand/scsiboot/bootxx.c

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/*
* Copyright (c) 1992 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)boot.c 7.6 (Berkeley) 2/15/93
*/
#include <sys/param.h>
#include <sys/exec.h>
char line[1024];
/*
* This gets arguments from the PROM, calls other routines to open
* and load the program to boot, and then transfers execution to that
* new program.
* Argv[0] should be something like "rz(0,0,0)vmunix" on a DECstation 3100.
* Argv[0,1] should be something like "boot 5/rz0/vmunix" on a DECstation 5000.
* The argument "-a" means vmunix should do an automatic reboot.
*/
void
main(argc, argv)
int argc;
char **argv;
{
register char *cp;
int ask, entry;
char *boot = "boot";
#ifdef JUSTASK
ask = 1;
#else
ask = 0;
#ifdef DS3100
for (cp = argv[0]; *cp; cp++) {
if (*cp == ')' && cp[1]) {
cp = argv[0];
goto fnd;
}
}
#endif
#ifdef DS5000
if (argc > 1) {
argc--;
argv++;
/* look for second '/' as in '5/rz0/vmunix' */
for (cp = argv[0]; *cp; cp++) {
if (*cp == '/') {
while (*++cp) {
if (*cp == '/' && cp[1]) {
cp = argv[0];
goto fnd;
}
}
}
}
}
#endif
ask = 1;
fnd:
;
#endif /* JUSTASK */
for (;;) {
if (ask) {
printf("Boot: ");
gets(line);
if (line[0] == '\0')
continue;
cp = line;
argv[0] = cp;
argc = 1;
} else
printf("Boot: %s\n", cp);
entry = loadfile(cp);
if (entry != -1)
break;
ask = 1;
}
printf("Starting at 0x%x\n\n", entry);
((void (*)())entry)(argc, argv);
}
/*
* Open 'filename', read in program and return the entry point or -1 if error.
*/
loadfile(fname)
register char *fname;
{
register struct devices *dp;
register int fd, i, n;
struct exec aout;
if ((fd = open(fname, 0)) < 0) {
printf("Can't open '%s'\n", fname);
goto err;
}
/* read the exec header */
i = read(fd, (char *)&aout, sizeof(aout));
if (i != sizeof(aout)) {
printf("No a.out header\n");
goto cerr;
} else if (aout.a_magic != OMAGIC) {
printf("A.out? magic 0%o size %d+%d+%d\n", aout.a_magic,
aout.a_text, aout.a_data, aout.a_bss);
goto cerr;
}
/* read the code and initialized data */
printf("Size: %d+%d", aout.a_text, aout.a_data);
if (lseek(fd, (off_t)N_TXTOFF(aout), 0) < 0) {
printf("\nSeek error\n");
goto cerr;
}
i = aout.a_text + aout.a_data;
#ifndef TEST
n = read(fd, (char *)aout.a_entry, i);
#else
n = i;
#endif
(void) close(fd);
if (n < 0) {
printf("\nRead error\n");
goto err;
} else if (n != i) {
printf("\nShort read (%d)\n", n);
goto err;
}
/* kernel will zero out its own bss */
n = aout.a_bss;
printf("+%d\n", n);
return ((int)aout.a_entry);
cerr:
(void) close(fd);
err:
return (-1);
}