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Date: Sat, 24 Nov 2012 15:24:54 -0800
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Subject: Re: [PATCH v3 11/12] x86, boot: add fields to support load bzImage
 and ramdisk high
From: Yinghai Lu <yinghai@kernel.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
        linux-kernel@vger.kernel.org, Rob Landley <rob@landley.net>,
        Matt Fleming <matt.fleming@intel.com>
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On Sat, Nov 24, 2012 at 2:32 PM, H. Peter Anvin <hpa@zytor.com> wrote:
> On 11/24/2012 02:18 PM, Yinghai Lu wrote:

> Well, that solves the problem for *this specific instance* but I fear
> therein lies madness in the general case.
>

use

   Bit 0 (read): CAN_BE_LOADED_ABOVE_4G
         - If 1, kernel/boot_params/cmdline/ramdisk can be above 4g,
                 set by kernel.

   Bit 1 (write): USE_EXT_BOOT_PARAMS
         - If 1, set by bootloader, and kernel could check new fields
in boot_params
                  that are added from 2.12 safely.