[PATCH] Update 32 bit boot protocol

[PATCH] Update 32 bit boot protocol

[Bernhard Walle]

This patch updates the boot protocol to match with the kernel. See
Documentation/i386/zero-page.txt in kernel.

The number of E820 map entries have been increased from 32 to 128. The update
is necessary for the next patch that implements EDD support for kexec.
when using the default 32 bit mode.


Signed-off-by: Bernhard Walle <bwalle@suse.de>

---
 doc/linux-i386-zero-page.txt |    3 +--
 include/x86/x86-linux.h      |    2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

--- a/doc/linux-i386-zero-page.txt
+++ b/doc/linux-i386-zero-page.txt
@@ -75,5 +75,4 @@ Offset	Type		Description
 0x224	unsigned short	setup.S heap end pointer
 0x290 - 0x2cf		EDD_MBR_SIG_BUFFER (edd.S)
 0x2d0 - 0x600		E820MAP
-0x600 - 0x7ff		EDDBUF (edd.S) for disk signature read sector
-0x600 - 0x7eb		EDDBUF (edd.S) for edd data
+0xd00 - 0xeec		EDDBUF (edd.S) for edd data
--- a/include/x86/x86-linux.h
+++ b/include/x86/x86-linux.h
@@ -4,7 +4,7 @@
 #define TENATIVE 0 /* Code that is tenatively correct but hasn't yet been officially accepted */
 
 #define E820MAP	0x2d0		/* our map */
-#define E820MAX	32		/* number of entries in E820MAP */
+#define E820MAX	128		/* number of entries in E820MAP */
 #define E820NR	0x1e8		/* # entries in E820MAP */
 
 #ifndef ASSEMBLY

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Re: [PATCH] Update 32 bit boot protocol

[Simon Horman]

On Fri, May 09, 2008 at 06:43:55PM +0200, Bernhard Walle wrote:
> This patch updates the boot protocol to match with the kernel. See
> Documentation/i386/zero-page.txt in kernel.
> 
> The number of E820 map entries have been increased from 32 to 128. The update
> is necessary for the next patch that implements EDD support for kexec.
> when using the default 32 bit mode.
> 
> 
> Signed-off-by: Bernhard Walle <bwalle@suse.de>

Thanks, I have applied this change, though I
am a little confused about the relationship between
the information in (kernel/)Documentation/i386/zero-page.txt and
(kexec-tools-testing/)doc/linux-i386-zero-page.txt.

-- 
Horms


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Re: [PATCH] Update 32 bit boot protocol

[Bernhard Walle]

* Simon Horman [2008-05-21 16:12]:
>
> On Fri, May 09, 2008 at 06:43:55PM +0200, Bernhard Walle wrote:
> > This patch updates the boot protocol to match with the kernel. See
> > Documentation/i386/zero-page.txt in kernel.
> > 
> > The number of E820 map entries have been increased from 32 to 128. The update
> > is necessary for the next patch that implements EDD support for kexec.
> > when using the default 32 bit mode.
> > 
> > 
> > Signed-off-by: Bernhard Walle <bwalle@suse.de>
> 
> Thanks, I have applied this change, though I
> am a little confused about the relationship between
> the information in (kernel/)Documentation/i386/zero-page.txt and
> (kexec-tools-testing/)doc/linux-i386-zero-page.txt.

Well, it's supposed to contain the same information. I think the 32 bit
boot protocol, i.e. the communication between the "setup" part of
bzImage and the real Linux kernel, was "explored" and used by kexec
first and then "standardised" by Linux developers. Therefore, the
documentation appeared first in kexec-tools and then some kernel
developer put it into documentation tree of the kernel.

Maybe it would make also sense to remove that part of documentation
from kexec and just refer to the (more up to date) Linux documentation.
But I leave this up to your decision. I just discovered that mistake.


	Bernhard

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