[PATCH] i386: Relocatable kernel support

This patch modifies the i386 kernel so that if CONFIG_RELOCATABLE is
selected it will be able to be loaded at any 4K aligned address below
1G.  The technique used is to compile the decompressor with -fPIC and
modify it so the decompressor is fully relocatable.  For the main
kernel relocations are generated.  Resulting in a kernel that is relocatable
with no runtime overhead and no need to modify the source code.

A reserved 32bit word in the parameters has been assigned
to serve as a stack so we figure out where are running.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/screen_info.h b/include/linux/screen_info.h
index 2925e66a6732..b02308ee7667 100644
--- a/include/linux/screen_info.h
+++ b/include/linux/screen_info.h
@@ -42,7 +42,8 @@ struct screen_info {
         u16 pages;              /* 0x32 */
         u16 vesa_attributes;    /* 0x34 */
         u32 capabilities;       /* 0x36 */
-                                /* 0x3a -- 0x3f reserved for future expansion */
+                                /* 0x3a -- 0x3b reserved for future expansion */
+                                /* 0x3c -- 0x3f micro stack for relocatable kernels */
 };
 
 extern struct screen_info screen_info;