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

H. Peter Anvin
2014-05-28T21:41:52Z

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