[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20080327040216.99dcde7b.pj@sgi.com>
Date: Thu, 27 Mar 2008 04:02:16 -0500
From: Paul Jackson <pj@....com>
To: Ingo Molnar <mingo@...e.hu>
Cc: ying.huang@...el.com, hpa@...or.com, andi@...stfloor.org,
mingo@...hat.com, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 0/4] x86_64 boot: Add linked listof struct
setup_data to boot protocol
Ingo asked:
> what happens with the SGI machine
Unless I misunderstand your post, Ingo, you don't need an SGI machine
for this one, ... just a compiler ;).
In the file arch/x86/boot/main.c, see the line:
BUILD_BUG_ON(sizeof boot_params != 4096);
This BUILD_BUG is serving as a reminder that the PC's "zero page", such
as is encoded in the struct boot_params (include/asm-x86/bootparam.h)
has to be exactly 4096 bytes by traditional PC architecture. One of
the entries in that struct is:
struct e820entry e820_map[E820MAX]; /* 0x2d0 */
H. Peter Anvin, Andi Kleen and Huang had further discussion in an
earlier email thread as to how to best extend this limit. I trust
that Huang's patch represents their concensus of that discussion.
By the way, Peter, do you have any idea what that E820NR define is
doing in include/asm-x86/e820.h ... it looks like useless redundancy
to me?
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@....com> 1.940.382.4214
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists