diff --git a/scripts/mkdep.c b/scripts/mkdep.c
new file mode 100644
index 0000000..c3e94bf
--- /dev/null
+++ b/scripts/mkdep.c
@@ -0,0 +1,628 @@
+/*
+ * Originally by Linus Torvalds.
+ * Smart CONFIG_* processing by Werner Almesberger, Michael Chastain.
+ *
+ * Usage: mkdep cflags -- file ...
+ * 
+ * Read source files and output makefile dependency lines for them.
+ * I make simple dependency lines for #include <*.h> and #include "*.h".
+ * I also find instances of CONFIG_FOO and generate dependencies
+ *    like include/config/foo.h.
+ *
+ * 1 August 1999, Michael Elizabeth Chastain, <mec@shout.net>
+ * - Keith Owens reported a bug in smart config processing.  There used
+ *   to be an optimization for "#define CONFIG_FOO ... #ifdef CONFIG_FOO",
+ *   so that the file would not depend on CONFIG_FOO because the file defines
+ *   this symbol itself.  But this optimization is bogus!  Consider this code:
+ *   "#if 0 \n #define CONFIG_FOO \n #endif ... #ifdef CONFIG_FOO".  Here
+ *   the definition is inactivated, but I still used it.  It turns out this
+ *   actually happens a few times in the kernel source.  The simple way to
+ *   fix this problem is to remove this particular optimization.
+ *
+ * 2.3.99-pre1, Andrew Morton <andrewm@uow.edu.au>
+ * - Changed so that 'filename.o' depends upon 'filename.[cS]'.  This is so that
+ *   missing source files are noticed, rather than silently ignored.
+ *
+ * 2.4.2-pre3, Keith Owens <kaos@ocs.com.au>
+ * - Accept cflags followed by '--' followed by filenames.  mkdep extracts -I
+ *   options from cflags and looks in the specified directories as well as the
+ *   defaults.   Only -I is supported, no attempt is made to handle -idirafter,
+ *   -isystem, -I- etc.
+ */
+
+#include <ctype.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+
+
+char __depname[512] = "\n\t@touch ";
+#define depname (__depname+9)
+int hasdep;
+
+struct path_struct {
+	int len;
+	char *buffer;
+};
+struct path_struct *path_array;
+int paths;
+
+
+/* Current input file */
+static const char *g_filename;
+
+/*
+ * This records all the configuration options seen.
+ * In perl this would be a hash, but here it's a long string
+ * of values separated by newlines.  This is simple and
+ * extremely fast.
+ */
+char * str_config  = NULL;
+int    size_config = 0;
+int    len_config  = 0;
+
+static void
+do_depname(void)
+{
+	if (!hasdep) {
+		hasdep = 1;
+		printf("%s:", depname);
+		if (g_filename)
+			printf(" %s", g_filename);
+	}
+}
+
+/*
+ * Grow the configuration string to a desired length.
+ * Usually the first growth is plenty.
+ */
+void grow_config(int len)
+{
+	while (len_config + len > size_config) {
+		if (size_config == 0)
+			size_config = 2048;
+		str_config = realloc(str_config, size_config *= 2);
+		if (str_config == NULL)
+			{ perror("malloc config"); exit(1); }
+	}
+}
+
+
+
+/*
+ * Lookup a value in the configuration string.
+ */
+int is_defined_config(const char * name, int len)
+{
+	const char * pconfig;
+	const char * plast = str_config + len_config - len;
+	for ( pconfig = str_config + 1; pconfig < plast; pconfig++ ) {
+		if (pconfig[ -1] == '\n'
+		&&  pconfig[len] == '\n'
+		&&  !memcmp(pconfig, name, len))
+			return 1;
+	}
+	return 0;
+}
+
+
+
+/*
+ * Add a new value to the configuration string.
+ */
+void define_config(const char * name, int len)
+{
+	grow_config(len + 1);
+
+	memcpy(str_config+len_config, name, len);
+	len_config += len;
+	str_config[len_config++] = '\n';
+}
+
+
+
+/*
+ * Clear the set of configuration strings.
+ */
+void clear_config(void)
+{
+	len_config = 0;
+	define_config("", 0);
+}
+
+
+
+/*
+ * This records all the precious .h filenames.  No need for a hash,
+ * it's a long string of values enclosed in tab and newline.
+ */
+char * str_precious  = NULL;
+int    size_precious = 0;
+int    len_precious  = 0;
+
+
+
+/*
+ * Grow the precious string to a desired length.
+ * Usually the first growth is plenty.
+ */
+void grow_precious(int len)
+{
+	while (len_precious + len > size_precious) {
+		if (size_precious == 0)
+			size_precious = 2048;
+		str_precious = realloc(str_precious, size_precious *= 2);
+		if (str_precious == NULL)
+			{ perror("malloc"); exit(1); }
+	}
+}
+
+
+
+/*
+ * Add a new value to the precious string.
+ */
+void define_precious(const char * filename)
+{
+	int len = strlen(filename);
+	grow_precious(len + 4);
+	*(str_precious+len_precious++) = '\t';
+	memcpy(str_precious+len_precious, filename, len);
+	len_precious += len;
+	memcpy(str_precious+len_precious, " \\\n", 3);
+	len_precious += 3;
+}
+
+
+
+/*
+ * Handle an #include line.
+ */
+void handle_include(int start, const char * name, int len)
+{
+	struct path_struct *path;
+	int i;
+
+	if (len == 14 && !memcmp(name, "include/config.h", len))
+		return;
+
+	if (len >= 7 && !memcmp(name, "config/", 7))
+		define_config(name+7, len-7-2);
+
+	for (i = start, path = path_array+start; i < paths; ++i, ++path) {
+		memcpy(path->buffer+path->len, name, len);
+		path->buffer[path->len+len] = '\0';
+		if (access(path->buffer, F_OK) == 0) {
+			do_depname();
+			printf(" \\\n   %s", path->buffer);
+			return;
+		}
+	}
+
+}
+
+
+
+/*
+ * Add a path to the list of include paths.
+ */
+void add_path(const char * name)
+{
+	struct path_struct *path;
+	char resolved_path[PATH_MAX+1];
+	const char *name2;
+
+	if (strcmp(name, ".")) {
+		name2 = realpath(name, resolved_path);
+		if (!name2) {
+			fprintf(stderr, "realpath(%s) failed, %m\n", name);
+			exit(1);
+		}
+	}
+	else {
+		name2 = "";
+	}
+
+	path_array = realloc(path_array, (++paths)*sizeof(*path_array));
+	if (!path_array) {
+		fprintf(stderr, "cannot expand path_arry\n");
+		exit(1);
+	}
+
+	path = path_array+paths-1;
+	path->len = strlen(name2);
+	path->buffer = malloc(path->len+1+256+1);
+	if (!path->buffer) {
+		fprintf(stderr, "cannot allocate path buffer\n");
+		exit(1);
+	}
+	strcpy(path->buffer, name2);
+	if (path->len && *(path->buffer+path->len-1) != '/') {
+		*(path->buffer+path->len) = '/';
+		*(path->buffer+(++(path->len))) = '\0';
+	}
+}
+
+
+
+/*
+ * Record the use of a CONFIG_* word.
+ */
+void use_config(const char * name, int len)
+{
+	char *pc;
+	int i;
+
+	pc = path_array[paths-1].buffer + path_array[paths-1].len;
+	memcpy(pc, "config/", 7);
+	pc += 7;
+
+	for (i = 0; i < len; i++) {
+	    char c = name[i];
+	    if (isupper(c)) c = tolower(c);
+	    if (c == '_')   c = '/';
+	    pc[i] = c;
+	}
+	pc[len] = '\0';
+
+	if (is_defined_config(pc, len))
+	    return;
+
+	define_config(pc, len);
+
+	do_depname();
+	printf(" \\\n   $(wildcard %s.h)", path_array[paths-1].buffer);
+}
+
+
+
+/*
+ * Macros for stunningly fast map-based character access.
+ * __buf is a register which holds the current word of the input.
+ * Thus, there is one memory access per sizeof(unsigned long) characters.
+ */
+
+#if defined(__alpha__) || defined(__i386__) || defined(__ia64__)  || defined(__x86_64__) || defined(__MIPSEL__)	\
+    || defined(__arm__)
+#define LE_MACHINE
+#endif
+
+#ifdef LE_MACHINE
+#define next_byte(x) (x >>= 8)
+#define current ((unsigned char) __buf)
+#else
+#define next_byte(x) (x <<= 8)
+#define current (__buf >> 8*(sizeof(unsigned long)-1))
+#endif
+
+#define GETNEXT { \
+	next_byte(__buf); \
+	if ((unsigned long) next % sizeof(unsigned long) == 0) { \
+		if (next >= end) \
+			break; \
+		__buf = * (unsigned long *) next; \
+	} \
+	next++; \
+}
+
+/*
+ * State machine macros.
+ */
+#define CASE(c,label) if (current == c) goto label
+#define NOTCASE(c,label) if (current != c) goto label
+
+/*
+ * Yet another state machine speedup.
+ */
+#define MAX2(a,b) ((a)>(b)?(a):(b))
+#define MIN2(a,b) ((a)<(b)?(a):(b))
+#define MAX5(a,b,c,d,e) (MAX2(a,MAX2(b,MAX2(c,MAX2(d,e)))))
+#define MIN5(a,b,c,d,e) (MIN2(a,MIN2(b,MIN2(c,MIN2(d,e)))))
+
+
+
+/*
+ * The state machine looks for (approximately) these Perl regular expressions:
+ *
+ *    m|\/\*.*?\*\/|
+ *    m|\/\/.*|
+ *    m|'.*?'|
+ *    m|".*?"|
+ *    m|#\s*include\s*"(.*?)"|
+ *    m|#\s*include\s*<(.*?>"|
+ *    m|#\s*(?define|undef)\s*CONFIG_(\w*)|
+ *    m|(?!\w)CONFIG_|
+ *
+ * About 98% of the CPU time is spent here, and most of that is in
+ * the 'start' paragraph.  Because the current characters are
+ * in a register, the start loop usually eats 4 or 8 characters
+ * per memory read.  The MAX5 and MIN5 tests dispose of most
+ * input characters with 1 or 2 comparisons.
+ */
+void state_machine(const char * map, const char * end)
+{
+	const char * next = map;
+	const char * map_dot;
+	unsigned long __buf = 0;
+
+	for (;;) {
+start:
+	GETNEXT
+__start:
+	if (current > MAX5('/','\'','"','#','C')) goto start;
+	if (current < MIN5('/','\'','"','#','C')) goto start;
+	CASE('/',  slash);
+	CASE('\'', squote);
+	CASE('"',  dquote);
+	CASE('#',  pound);
+	CASE('C',  cee);
+	goto start;
+
+/* // */
+slash_slash:
+	GETNEXT
+	CASE('\n', start);
+	NOTCASE('\\', slash_slash);
+	GETNEXT
+	goto slash_slash;
+
+/* / */
+slash:
+	GETNEXT
+	CASE('/',  slash_slash);
+	NOTCASE('*', __start);
+slash_star_dot_star:
+	GETNEXT
+__slash_star_dot_star:
+	NOTCASE('*', slash_star_dot_star);
+	GETNEXT
+	NOTCASE('/', __slash_star_dot_star);
+	goto start;
+
+/* '.*?' */
+squote:
+	GETNEXT
+	CASE('\'', start);
+	NOTCASE('\\', squote);
+	GETNEXT
+	goto squote;
+
+/* ".*?" */
+dquote:
+	GETNEXT
+	CASE('"', start);
+	NOTCASE('\\', dquote);
+	GETNEXT
+	goto dquote;
+
+/* #\s* */
+pound:
+	GETNEXT
+	CASE(' ',  pound);
+	CASE('\t', pound);
+	CASE('i',  pound_i);
+	CASE('d',  pound_d);
+	CASE('u',  pound_u);
+	goto __start;
+
+/* #\s*i */
+pound_i:
+	GETNEXT NOTCASE('n', __start);
+	GETNEXT NOTCASE('c', __start);
+	GETNEXT NOTCASE('l', __start);
+	GETNEXT NOTCASE('u', __start);
+	GETNEXT NOTCASE('d', __start);
+	GETNEXT NOTCASE('e', __start);
+	goto pound_include;
+
+/* #\s*include\s* */
+pound_include:
+	GETNEXT
+	CASE(' ',  pound_include);
+	CASE('\t', pound_include);
+	map_dot = next;
+	CASE('"',  pound_include_dquote);
+	CASE('<',  pound_include_langle);
+	goto __start;
+
+/* #\s*include\s*"(.*)" */
+pound_include_dquote:
+	GETNEXT
+	CASE('\n', start);
+	NOTCASE('"', pound_include_dquote);
+	handle_include(0, map_dot, next - map_dot - 1);
+	goto start;
+
+/* #\s*include\s*<(.*)> */
+pound_include_langle:
+	GETNEXT
+	CASE('\n', start);
+	NOTCASE('>', pound_include_langle);
+	handle_include(1, map_dot, next - map_dot - 1);
+	goto start;
+
+/* #\s*d */
+pound_d:
+	GETNEXT NOTCASE('e', __start);
+	GETNEXT NOTCASE('f', __start);
+	GETNEXT NOTCASE('i', __start);
+	GETNEXT NOTCASE('n', __start);
+	GETNEXT NOTCASE('e', __start);
+	goto pound_define_undef;
+
+/* #\s*u */
+pound_u:
+	GETNEXT NOTCASE('n', __start);
+	GETNEXT NOTCASE('d', __start);
+	GETNEXT NOTCASE('e', __start);
+	GETNEXT NOTCASE('f', __start);
+	goto pound_define_undef;
+
+/*
+ * #\s*(define|undef)\s*CONFIG_(\w*)
+ *
+ * this does not define the word, because it could be inside another
+ * conditional (#if 0).  But I do parse the word so that this instance
+ * does not count as a use.  -- mec
+ */
+pound_define_undef:
+	GETNEXT
+	CASE(' ',  pound_define_undef);
+	CASE('\t', pound_define_undef);
+
+	        NOTCASE('C', __start);
+	GETNEXT NOTCASE('O', __start);
+	GETNEXT NOTCASE('N', __start);
+	GETNEXT NOTCASE('F', __start);
+	GETNEXT NOTCASE('I', __start);
+	GETNEXT NOTCASE('G', __start);
+	GETNEXT NOTCASE('_', __start);
+
+	map_dot = next;
+pound_define_undef_CONFIG_word:
+	GETNEXT
+	if (isalnum(current) || current == '_')
+		goto pound_define_undef_CONFIG_word;
+	goto __start;
+
+/* \<CONFIG_(\w*) */
+cee:
+	if (next >= map+2 && (isalnum(next[-2]) || next[-2] == '_'))
+		goto start;
+	GETNEXT NOTCASE('O', __start);
+	GETNEXT NOTCASE('N', __start);
+	GETNEXT NOTCASE('F', __start);
+	GETNEXT NOTCASE('I', __start);
+	GETNEXT NOTCASE('G', __start);
+	GETNEXT NOTCASE('_', __start);
+
+	map_dot = next;
+cee_CONFIG_word:
+	GETNEXT
+	if (isalnum(current) || current == '_')
+		goto cee_CONFIG_word;
+	use_config(map_dot, next - map_dot - 1);
+	goto __start;
+    }
+}
+
+
+
+/*
+ * Generate dependencies for one file.
+ */
+void do_depend(const char * filename, const char * command)
+{
+	int mapsize;
+	int pagesizem1 = getpagesize()-1;
+	int fd;
+	struct stat st;
+	char * map;
+
+	fd = open(filename, O_RDONLY);
+	if (fd < 0) {
+		perror(filename);
+		return;
+	}
+
+	fstat(fd, &st);
+	if (st.st_size == 0) {
+		fprintf(stderr,"%s is empty\n",filename);
+		close(fd);
+		return;
+	}
+
+	mapsize = st.st_size;
+	mapsize = (mapsize+pagesizem1) & ~pagesizem1;
+	map = mmap(NULL, mapsize, PROT_READ, MAP_PRIVATE, fd, 0);
+	if ((long) map == -1) {
+		perror("mkdep: mmap");
+		close(fd);
+		return;
+	}
+	if ((unsigned long) map % sizeof(unsigned long) != 0)
+	{
+		fprintf(stderr, "do_depend: map not aligned\n");
+		exit(1);
+	}
+
+	hasdep = 0;
+	clear_config();
+	state_machine(map, map+st.st_size);
+	if (hasdep) {
+		puts(command);
+		if (*command)
+			define_precious(filename);
+	}
+
+	munmap(map, mapsize);
+	close(fd);
+}
+
+
+
+/*
+ * Generate dependencies for all files.
+ */
+int main(int argc, char **argv)
+{
+	int len;
+	const char *hpath;
+
+	hpath = getenv("TOPDIR");
+	if (!hpath) {
+		fputs("mkdep: TOPDIR not set in environment.  "
+		      "Don't bypass the top level Makefile.\n", stderr);
+		return 1;
+	}
+
+	add_path(".");		/* for #include "..." */
+
+	while (++argv, --argc > 0) {
+		if (strncmp(*argv, "-I", 2) == 0) {
+			if (*((*argv)+2)) {
+				add_path((*argv)+2);
+			}
+			else {
+				++argv;
+				--argc;
+				add_path(*argv);
+			}
+		}
+		else if (strcmp(*argv, "--") == 0) {
+			break;
+		}
+	}
+
+	add_path(hpath);	/* must be last entry, for config files */
+
+	while (--argc > 0) {
+		const char * filename = *++argv;
+		const char * command  = __depname;
+		g_filename = 0;
+		len = strlen(filename);
+		memcpy(depname, filename, len+1);
+		if (len > 2 && filename[len-2] == '.') {
+			if (filename[len-1] == 'c' || filename[len-1] == 'S') {
+			    depname[len-1] = 'o';
+			    g_filename = filename;
+			    command = "";
+			}
+		}
+		do_depend(filename, command);
+	}
+	if (len_precious) {
+		*(str_precious+len_precious) = '\0';
+		printf(".PRECIOUS:%s\n", str_precious);
+	}
+	return 0;
+}