linux-kernel - Re: [PATCH v3 11/12] x86, boot: add fields to support load bzImage and ramdisk high

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Message-ID: <CAE9FiQXF+00J+UaqWM1BrYGn++6L3Y0a78xC5mPSpZTzXY+azw@mail.gmail.com>
Date:	Sat, 24 Nov 2012 15:24:54 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Rob Landley <rob@...dley.net>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH v3 11/12] x86, boot: add fields to support load bzImage
 and ramdisk high

On Sat, Nov 24, 2012 at 2:32 PM, H. Peter Anvin <hpa@...or.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.
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