linux-kernel - Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

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Message-ID: <m1abwetgkn.fsf@ebiederm.dsl.xmission.com>
Date:	Wed, 09 May 2007 04:52:08 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	yhlu <yhlu.kernel@...il.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>, vgoyal@...ibm.com,
	Gerd Hoffmann <kraxel@...hat.com>,
	Jeff Garzik <jeff@...zik.org>, patches@...-64.org,
	linux-kernel@...r.kernel.org,
	virtualization <virtualization@...ts.linux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

"H. Peter Anvin" <hpa@...or.com> writes:

> yhlu wrote:
>> so the kexec tools need to scan the pci devices list, and find out how
>> to set real_mode.isVGA and orig_video_mode, also need to parse the
>> comand line about vga console.
>
> BTW, welcome to the hell of bypassing setup.

Well in this case things are so very much better then attempting to
us setup.S it isn't a real option.

In general BIOS calls just don't work reliably after linux has
been running for a while.

As for YH's point it does look like there are a few ways
to poke the linux kernel to see what is happening.

We can look in /proc/ioports and see what has reserved
the video resources.  That should give us a reasonable
estimate of the video adapter.  We can do an ioctl to
the console and see how many lines and columns we have.

Reusing boot_params could be nice but if we have the information
available in other ways digging it out that way is quite possibly
better.

Eric
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