From: greg@kroah.com (Greg KH)
To: kernelnewbies@lists.kernelnewbies.org
Subject: How to add x32 ABI support to PCI driver
Date: Tue, 12 Aug 2014 14:26:20 +0800 [thread overview]
Message-ID: <20140812062620.GA14291@kroah.com> (raw)
In-Reply-To: <CABSmm11VF+b24cJPxzDStzoHzQNu5OWsaPqUvUnzyEKWFpeFSQ@mail.gmail.com>
On Mon, Aug 11, 2014 at 11:07:32PM -0700, Omkar Houddin wrote:
> Hello Greg,
>
> I working on a char device driver. It is mostly based on the the scull device
> driver in the LDD book.
> It controls a HBA sitting on the PCIe BUS.
What type of "Host Bus Adapter" needs to be a char driver? What
userspace programs are talking to this device? Why do you need to be a
kernel driver at all and not just a UIO userspace driver?
Anyway, there's nothing "special" you need to do for x32 that you
shouldn't have already done properly for your char interface to handle a
mixture of 32/64bit kernel and userspace issues. So again, nothing
should change, other than making sure you properly handle mixed
user/kernel bit sizes properly.
Do you have a pointer to your source code anywhere?
thanks,
greg k-h
prev parent reply other threads:[~2014-08-12 6:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-12 4:55 How to add x32 ABI support to PCI driver Omkar Houddin
2014-08-12 5:07 ` Greg KH
2014-08-12 6:07 ` Omkar Houddin
2014-08-12 6:26 ` Greg KH [this message]
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