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@@ -0,0 +1,80 @@
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+/*
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+ * patch-cmdline.c - patch the kernel command line on rb532
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+ *
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+ * Copyright (C) 2006 Felix Fietkau <[email protected]>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; either version 2
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+ * of the License, or (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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+ *
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+ * $Id:$
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+ */
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+
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <stddef.h>
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+#include <unistd.h>
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+#include <fcntl.h>
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+#include <sys/mman.h>
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+#include <sys/stat.h>
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+#include <string.h>
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+
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+#define SEARCH_SPACE (16 * 1024)
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+#define CMDLINE_MAX 512
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+
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+int main(int argc, char **argv)
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+{
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+ int fd, found = 0, len, ret = -1;
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+ char *ptr, *p;
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+
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+ if (argc != 3) {
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+ fprintf(stderr, "Usage: %s <file> <cmdline>\n", argv[0]);
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+ goto err1;
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+ }
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+ len = strlen(argv[2]);
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+ if (len + 9 > CMDLINE_MAX) {
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+ fprintf(stderr, "Command line string too long\n");
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+ goto err1;
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+ }
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+
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+ if (((fd = open(argv[1], O_RDWR)) < 0) ||
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+ (ptr = (char *) mmap(0, SEARCH_SPACE + CMDLINE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1)) {
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+ fprintf(stderr, "Could not open kernel image");
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+ goto err2;
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+ }
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+
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+ for (p = ptr; p < (ptr + SEARCH_SPACE); p += 4) {
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+ if (memcmp(p, "CMDLINE:", 8) == 0) {
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+ found = 1;
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+ p += 8;
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+ break;
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+ }
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+ }
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+ if (!found) {
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+ fprintf(stderr, "Command line marker not found!\n");
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+ goto err3;
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+ }
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+
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+ memset(p, 0, CMDLINE_MAX - 8);
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+ strcpy(p, argv[2]);
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+ msync(p, CMDLINE_MAX, MS_SYNC|MS_INVALIDATE);
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+ ret = 0;
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+
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+err3:
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+ munmap((void *) ptr, len);
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+err2:
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+ if (fd > 0)
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+ close(fd);
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+err1:
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+ return ret;
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+}
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Felix Fietkau