RE: 64bit driver driver with 32 bit long

From: Tawade, Prashant (prashant.tawade_at_intel.com)
Date: 04/04/05

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    Date: Mon, 4 Apr 2005 17:53:36 -0400
To: "For users of Fedora Core releases" <fedora-list@redhat.com>

    Hi Jonathan

    That is what I would have ended up with anyway. But I did not find gcc
    option to force long to 32 bit. I got my answer, the best way is to use
    "u32" datasize, which would work across 32/64 bit platform.

    Prashant

    -----Original Message-----
    From: fedora-list-bounces@redhat.com
    [mailto:fedora-list-bounces@redhat.com] On Behalf Of Jonathan Berry
    Sent: Monday, April 04, 2005 5:27 PM
    To: For users of Fedora Core releases
    Subject: Re: 64bit driver driver with 32 bit long

    On Apr 4, 2005 1:04 PM, Tawade, Prashant <prashant.tawade@intel.com>
    wrote:
    >
    > Hi
    >
    > Does anyone know how to build a 64 bit driver with "32 bit unsigned
    long",
    > as is in the case of windows 64 bit drivers ?
    >
    > Prashant

    Hi Prashant,
    What exactly do you mean? With a 64-bit compile, an unsigned long
    variable is going to be 64-bits wide. As far as I know, there is no
    way to change that. sizeof(long) == sizeof(void *) has to be true.
    To use a 32-bit wide (unsigned) variable, use the unsigned int type.
    For example:
    typedef unsigned int u32type;
    "u32type" can be whatever you want to call your unsigned 32-bit data
    type. If this code has to work for both 32- and 64-bit environments,
    then you should use some #if statements to determine which typedef to
    use. Is this what you wanted to know, or are you asking something
    different?

    Jonathan 

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