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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: Is the GIO_FONT ioctl() busted in Linux kernel 2.4?
Date: 27 Feb 2003 17:02:29 -0800
Organization: Transmeta Corporation, Santa Clara CA
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Followup to:  <3E5DE0FC.29370.6FD7FC8B@localhost>
By author:    "Kendall Bennett" <KendallB@scitechsoft.com>
In newsgroup: linux.dev.kernel
>
> "Kendall Bennett" <KendallB@scitechsoft.com> wrote:
> 
> > From looking at the 2.4 kernel source code that comes with Red
> > Hat 8.0, it is clear that these functions are implemented on top
> > of a new console font interface that supports 512 characters and
> > up to 32x32 pixel fonts (obviously for fb consoles). 
> 
> Yep, after further investigation the problem is that the VGA console is 
> configured to run with 512 characters, yet the 'old' interface code is 
> trying to save/restore only 256 characters so it fails. It could be fixed 
> if it was changed to save/restore 512 characters, but I don't know if 
> that will break old code (it won't break mine as I always uses a 64K 
> buffer to save/restore the font tables).
> 

It will break old code.  That's why you've been supposed to use
GIO_FONTX (and GIO_UNISCRNMAP) since the 1.3.1 kernel days (which is
when 512-character support was introduced.)

You're *way* behind the times.

man 4 console_ioctl

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
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