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[PATCH] i386: Relocatable kernel support

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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>
This commit is contained in:
Eric W. Biederman
2006-12-07 02:14:04 +01:00
committed by Andi Kleen
parent fd593d1277
commit 968de4f026
10 changed files with 919 additions and 209 deletions
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3
include/linux/screen_info.h
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@ -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;