[PATCH] x86: reserve a boot-loader ID number for Xen

Claim an ID number for Xen in the LOADER_TYPE field.

Also, keep the table in zero-page.txt consistent with boot.txt.

[hpa says: 6 was skipped because I couldn't rule out that it hadn't been
 unofficially used.  It seemed easier to skip it for now.]
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Documentation/i386/boot.txt

@@ -181,6 +181,7 @@ filled out, however:
 	5  ELILO
 	7  GRuB
 	8  U-BOOT
+	9  Xen
 
 	Please contact <hpa@zytor.com> if you need a bootloader ID
 	value assigned.

Documentation/i386/zero-page.txt

@@ -63,6 +63,10 @@ Offset	Type		Description
 				2 for bootsect-loader
 				3 for SYSLINUX
 				4 for ETHERBOOT
+				5 for ELILO
+				7 for GRuB
+				8 for U-BOOT
+				9 for Xen
 				V = version
 0x211	char		loadflags:
 			bit0 = 1: kernel is loaded high (bzImage)