[PATCH] x86: add command line length to boot protocol
authorBernhard Walle <bwalle@suse.de>
Wed, 2 May 2007 17:27:10 +0000 (19:27 +0200)
committerAndi Kleen <andi@basil.nowhere.org>
Wed, 2 May 2007 17:27:10 +0000 (19:27 +0200)
commit8f9aeca7a081d81c4c9862be1e04f15b5ab5461f
tree49b802b90aca5b170aba5734ef99344a90426b01
parent79e030114a8d97a1dcd593ab84fb986f8c91c536
[PATCH] x86: add command line length to boot protocol

Because the command line is increased to 2048 characters after 2.6.21, it's
not possible for boot loaders and userspace tools to determine the length
of the command line the kernel can understand.  The benefit of knowing the
length is that users can be warned if the command line size is too long
which prevents surprise if things don't work after bootup.

This patch updates the boot protocol to contain a field called
"cmdline_size" that contain the length of the command line (excluding the
terminating zero).

The patch also adds missing fields (of protocol version 2.05) to the x86_64
setup code.

Signed-off-by: Bernhard Walle <bwalle@suse.de>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Alon Bar-Lev <alon.barlev@gmail.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Documentation/i386/boot.txt
arch/i386/boot/setup.S
arch/x86_64/boot/setup.S