linux-kernel - Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit and 32-bit ports

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Message-ID: <53865820.7010309@zytor.com>
Date:	Wed, 28 May 2014 14:41:52 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arnd Bergmann <arnd@...db.de>, josh@...htriplett.org
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit
 and 32-bit ports

On 05/19/2014 05:36 AM, Arnd Bergmann wrote:
> 
> My feeling is that all devices we can think of fall into at least one
> of these categories:
> 
> * legacy PC stuff that needs only byte access
> * PCI devices that can be accessed through sysfs
> * devices on x86 that can be accessed using iopl
> 

I don't believe PCI I/O space devices can be accessed through sysfs, but
perhaps I'm wrong?  (mmapping I/O space is not portable.)


	-hpa


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