--- Net2/arch/i386/boot/io.c	2018/04/24 18:12:41	1.1
+++ Net2/arch/i386/boot/io.c	2018/04/24 18:20:59	1.1.1.2
@@ -28,11 +28,17 @@
 
 /*
  * HISTORY
- * $Log: io.c,v $
- * Revision 1.1  2018/04/24 18:12:41  root
- * Initial revision
+ * io.c,v
+ * Revision 1.3  1993/07/11  12:02:24  andrew
+ * Fixes from bde, including support for loading @ any MB boundary (e.g. a
+ * kernel linked for 0xfe100000 will load at the 1MB mark) and read-ahead
+ * buffering to speed booting from floppies.  Also works with aha174x
+ * controllers in enhanced mode.
  *
- * Revision 1.1  1993/03/21 18:08:38  cgd
+ * Revision 1.2  1993/06/18  02:28:59  cgd
+ * make it *do* something when loading the kernel, a la sun twiddling-thing
+ *
+ * Revision 1.1  1993/03/21  18:08:38  cgd
  * after 0.2.2 "stable" patches applied
  *
  * Revision 2.2  92/04/04  11:35:57  rpd
@@ -88,6 +94,8 @@ printf(format,data)
 {
 	int *dataptr = &data;
 	char c;
+
+	reset_twiddle();
 	while (c = *format++)
 		if (c != '%')
 			putchar(c);
@@ -193,3 +201,25 @@ int len;
 	while (len-- > 0)
 		*to++ = *from++;
 }
+
+static int tw_on;
+static int tw_pos;
+static char tw_chars[] = "|/-\\";
+
+reset_twiddle()
+{
+	if (tw_on)
+		putchar('\b');
+	tw_on = 0;
+	tw_pos = 0;
+}
+
+twiddle()
+{
+	if (tw_on)
+		putchar('\b');
+	else
+		tw_on = 1;
+	putchar(tw_chars[tw_pos++]);
+	tw_pos %= (sizeof(tw_chars) - 1);
+}