patch-2.1.45 linux/arch/sparc/boot/piggyback.c

• Lines: 101
• Date: Wed Jul 16 19:22:50 1997
• Orig file: v2.1.44/linux/arch/sparc/boot/piggyback.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.44/linux/arch/sparc/boot/piggyback.c linux/arch/sparc/boot/piggyback.c
@@ -0,0 +1,100 @@
+/* $Id: piggyback.c,v 1.1 1997/07/11 11:05:17 jj Exp $
+   Simple utility to make a single-image install kernel with initial ramdisk
+   for Sparc tftpbooting without need to set up nfs.
+   
+   Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+   
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+/* Note: run this on an a.out kernel (use elftoaout for it), as PROM looks for a.out image onlly
+   usage: piggyback vmlinux System.map tail, where tail is gzipped fs of the initial ramdisk */
+
+void die(char *str)
+{
+	perror (str);
+	exit(1);
+}
+
+int main(int argc,char **argv)
+{
+	char buffer [1024], *q, *r;
+	unsigned int i, j, k, start, end, offset;
+	FILE *map;
+	struct stat s;
+	int image, tail;
+	
+	if (stat (argv[3], &s) < 0) die (argv[3]);
+	map = fopen (argv[2], "r");
+	if (!map) die(argv[2]);
+	while (fgets (buffer, 1024, map)) {
+		if (!strcmp (buffer + 11, "start\n"))
+			start = strtoul (buffer, NULL, 16);
+		else if (!strcmp (buffer + 11, "end\n"))
+			end = strtoul (buffer, NULL, 16);
+	}
+	fclose (map);
+	if ((image = open(argv[1],O_RDWR)) < 0) die(argv[1]);
+	if (read(image,buffer,512) != 512) die(argv[1]);
+	if (!memcmp (buffer, "\177ELF", 4)) {
+		unsigned int *p = (unsigned int *)(buffer + *(unsigned int *)(buffer + 28));
+	    
+		i = p[1] + *(unsigned int *)(buffer + 24) - p[2];
+		if (lseek(image,i,0) < 0) die("lseek");
+		if (read(image,buffer,512) != 512) die(argv[1]);
+		j = 0;
+	} else if (*(unsigned int *)buffer == 0x01030107) {
+		i = j = 32;
+	} else {
+		fprintf (stderr, "Not ELF nor a.out. Don't blame me.\n");
+		exit(1);
+	}
+	k = i;
+	i += ((*(unsigned short *)(buffer + j + 2))<<2) - 512;
+	if (lseek(image,i,0) < 0) die("lseek");
+	if (read(image,buffer,1024) != 1024) die(argv[1]);
+	for (q = buffer, r = q + 512; q < r; q += 4) {
+		if (*q == 'H' && q[1] == 'd' && q[2] == 'r' && q[3] == 'S')
+			break;
+	}
+	if (q == r) {
+		fprintf (stderr, "Couldn't find headers signature in the kernel.\n");
+		exit(1);
+	}
+	offset = i + (q - buffer) + 10;
+	if (lseek(image, offset, 0) < 0) die ("lseek");
+	*(unsigned *)buffer = 0;
+	*(unsigned *)(buffer + 4) = 0x01000000;
+	*(unsigned *)(buffer + 8) = ((end + 32 + 4095) & ~4095);
+	*(unsigned *)(buffer + 12) = s.st_size;
+	if (write(image,buffer+2,14) != 14) die (argv[1]);
+	if (lseek(image, k - start + ((end + 32 + 4095) & ~4095), 0) < 0) die ("lseek");
+	if ((tail = open(argv[3],O_RDONLY)) < 0) die(argv[3]);
+	while ((i = read (tail,buffer,1024)) > 0)
+		if (write(image,buffer,i) != i) die (argv[1]);
+	if (close(image) < 0) die("close");
+	if (close(tail) < 0) die("close");
+    	return 0;
+}