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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sparc/boot/piggyback.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/sparc/boot/piggyback.c')
-rw-r--r--arch/sparc/boot/piggyback.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/arch/sparc/boot/piggyback.c b/arch/sparc/boot/piggyback.c
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+++ b/arch/sparc/boot/piggyback.c
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+/* $Id: piggyback.c,v 1.4 2000/12/05 00:48:57 anton 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)
+ Pete Zaitcev <zaitcev@yahoo.com> endian fixes for cross-compiles, 2000.
+
+ 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 only.
+ */
+
+unsigned short ld2(char *p)
+{
+ return (p[0] << 8) | p[1];
+}
+
+unsigned int ld4(char *p)
+{
+ return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
+}
+
+void st4(char *p, unsigned int x)
+{
+ p[0] = x >> 24;
+ p[1] = x >> 16;
+ p[2] = x >> 8;
+ p[3] = x;
+}
+
+void usage(void)
+{
+ /* fs_img.gz is an image of initial ramdisk. */
+ fprintf(stderr, "Usage: piggyback vmlinux.aout System.map fs_img.gz\n");
+ fprintf(stderr, "\tKernel image will be modified in place.\n");
+ exit(1);
+}
+
+void die(char *str)
+{
+ perror (str);
+ exit(1);
+}
+
+int main(int argc,char **argv)
+{
+ static char aout_magic[] = { 0x01, 0x03, 0x01, 0x07 };
+ unsigned char buffer[1024], *q, *r;
+ unsigned int i, j, k, start, end, offset;
+ FILE *map;
+ struct stat s;
+ int image, tail;
+
+ if (argc != 4) usage();
+ start = end = 0;
+ 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 + 8, " T start\n") || !strcmp (buffer + 16, " T start\n"))
+ start = strtoul (buffer, NULL, 16);
+ else if (!strcmp (buffer + 8, " A end\n") || !strcmp (buffer + 16, " A end\n"))
+ end = strtoul (buffer, NULL, 16);
+ }
+ fclose (map);
+ if (!start || !end) {
+ fprintf (stderr, "Could not determine start and end from System.map\n");
+ exit(1);
+ }
+ 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) == 0) {
+ q = buffer + ld4(buffer + 28);
+ i = ld4(q + 4) + ld4(buffer + 24) - ld4(q + 8);
+ if (lseek(image,i,0) < 0) die("lseek");
+ if (read(image,buffer,512) != 512) die(argv[1]);
+ j = 0;
+ } else if (memcmp(buffer, aout_magic, 4) == 0) {
+ i = j = 32;
+ } else {
+ fprintf (stderr, "Not ELF nor a.out. Don't blame me.\n");
+ exit(1);
+ }
+ k = i;
+ i += (ld2(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");
+
+ st4(buffer, 0);
+ st4(buffer + 4, 0x01000000);
+ st4(buffer + 8, (end + 32 + 4095) & ~4095);
+ st4(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;
+}