linux-kernel - Re: [PATCH 1/2] OLPC: Add support for calling into Open Firmware

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Date:	Sun, 20 Apr 2008 08:07:55 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Andres Salomon <dilinger@...ued.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joseph Fannin <jfannin@...il.com>,
	linux-kernel@...r.kernel.org, jordan.crouse@....com,
	Mitch Bradley <wmb@...mworks.com>
Subject: Re: [PATCH 1/2] OLPC: Add support for calling into Open Firmware

Yinghai Lu wrote:
> On Sat, Apr 19, 2008 at 10:39 AM, Andres Salomon <dilinger@...ued.net> wrote:
>>  This adds 32-bit support for calling into OFW from the kernel.  It's useful
>>  for querying the firmware for misc hardware information, fetching the device
>>  tree, etc.
>>
>>  There's potentially no reason why other platforms couldn't use this, but
>>  currently OLPC is the main user of it.
>>
>>  This work was originally done by Mitch Bradley.
>>

Hm.  This interface seems more than a bit ad hoc.  In particular, I 
*really* don't like the swapper_pg_dir hack.

"There must be a better way."

	-hpa
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