Update 32 bit boot protocol
Subsystems (2)
PATCH 1/1 Update 32 bit boot protocol
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.
--- doc/linux-i386-zero-page.txt | 3 +-- include/x86/x86-linux.h | 2 +- 2 files changed, 2 insertions(+), 3 deletions(-)
doc/linux-i386-zero-page.txt +1 -2
@@ -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
include/x86/x86-linux.h +1 -1
@@ -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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Quoted 9 lines · Bernhard Walle
This patch updates the boot protocol to match with the kernel. See
Documentation/i386/zero-page.txtin 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 <[email protected]>
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.
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Quoted 10 lines · Simon Horman
Quoted 8 lines · Bernhard Walle
This patch updates the boot protocol to match with the kernel. See
Documentation/i386/zero-page.txtin 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.
Quoted 6 lines
Quoted 1 line
Signed-off-by Bernhard Walle <[email protected]>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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