Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override. | KernelTrap

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

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From: H. Peter Anvin <hpa@...>

To: Rene Herman <rene.herman@...>

Cc: Alan Cox <alan@...>, David P. Reed <dpreed@...>, Rene Herman <rene.herman@...>, Ingo Molnar <mingo@...>, Paul Rolland <rol@...>, Pavel Machek <pavel@...>, Thomas Gleixner <tglx@...>, <linux-kernel@...>, Ingo Molnar <mingo@...>, <rol@...>

Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

Date: Tuesday, January 1, 2008 - 6:39 pm

Rene Herman wrote:
quoted text>>
>> Yes, we do.  It's exactly this side effect which makes this safer than 
>> either 0x80 or 0xED -- it's a port that *guaranteed* can't be 
>> reclaimed for other purposes without breaking MS-DOS compatibility.
> 
> I see that with CR0.NE set (*) we indeed don't care about IGNNE#...
> 
> However, I'm worried about this comment in arch/x86/kernel/i8259_32.c
> 
> ===
> /*
>  * New motherboards sometimes make IRQ 13 be a PCI interrupt,
>  * so allow interrupt sharing.
>  */
> ===
> 
> Is it really safe to just blindly negate IRQ13 on everything out there, 
> from regular PC through funky embedded thingies?
> 

It's not any IRQ 13, it's IRQ 13 from the FPU.

	-hpa
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Messages in current thread:

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., David P. Reed, (Tue Jan 1, 11:59 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Pavel Machek, (Tue Jan 1, 1:31 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., David P. Reed, (Tue Jan 1, 1:33 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 12:15 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 5:15 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 5:35 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 5:44 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Maciej W. Rozycki, (Wed Jan 9, 1:27 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Wed Jan 9, 2:18 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 6:35 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 6:39 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 7:11 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 8:55 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 10:27 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 9:00 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 8:25 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., David P. Reed, (Tue Jan 1, 1:32 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 1:38 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Tue Jan 1, 12:43 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 1:32 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Tue Jan 1, 2:45 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 5:07 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Wed Jan 2, 6:04 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Wed Jan 2, 9:47 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Wed Jan 2, 11:35 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Wed Jan 2, 11:50 am)

Re: [linux-kernel] Re: [PATCH] x86: provide a DMI based port..., David P. Reed, (Wed Jan 2, 9:11 am)

Re: [linux-kernel] Re: [PATCH] x86: provide a DMI based port..., Ingo Molnar, (Wed Jan 2, 9:21 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 4:14 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 5:13 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 1:32 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Tue Jan 1, 2:46 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 3:35 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 5:21 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Wed Jan 2, 6:00 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 7:05 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 7:12 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 8:23 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Tue Jan 1, 5:01 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 5:42 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 5:50 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 5:42 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 5:26 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 3:59 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 4:55 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 5:24 pm)

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