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authorH. Peter Anvin <hpa@zytor.com>2007-07-11 23:18:33 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-12 21:55:54 +0400
commit85414b693ac037d709582a167a330db3a5d186d8 (patch)
tree78836556d59e28c335d2ba5be347c06f4298432e /Documentation
parent1d67953f2bda8876045c24ae58841f27d9bb7572 (diff)
downloadlinux-85414b693ac037d709582a167a330db3a5d186d8.tar.xz
Define zero-page offset 0x1e4 as a scratch field, and use it
The relocatable kernel code needs a scratch field for the decompressor to determine its own location. It was using a location inside struct screen_info; reserve a free location and document it as scratch instead. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/i386/zero-page.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/i386/zero-page.txt b/Documentation/i386/zero-page.txt
index c04a421f4a7c..75b3680c41eb 100644
--- a/Documentation/i386/zero-page.txt
+++ b/Documentation/i386/zero-page.txt
@@ -37,6 +37,7 @@ Offset Type Description
0x1d0 unsigned long EFI memory descriptor map pointer
0x1d4 unsigned long EFI memory descriptor map size
0x1e0 unsigned long ALT_MEM_K, alternative mem check, in Kb
+0x1e4 unsigned long Scratch field for the kernel setup code
0x1e8 char number of entries in E820MAP (below)
0x1e9 unsigned char number of entries in EDDBUF (below)
0x1ea unsigned char number of entries in EDD_MBR_SIG_BUFFER (below)