Messages in this thread |  | | Date | Sun, 6 Aug 2006 12:31:43 +0200 | | From | Jan-Benedict Glaw <> | | | Subject | Re: writing portable code based on BITS_PER_LONG? |
On Sat, 2006-08-05 23:16:29 -0700, Om N. <xhandle@gmail.com> wrote:
> I am trying to port a driver written for IA32. This is a pci driver
> and has a chipset doing PCI <-> local bus data transfer, where local
> bus is 16 bit. So a number of values are converted by right/left
> shifting by 16 bits.
>
> Now that I am doing porting, I would like to make it fully portable
> across AMD64 and IA32. What is the best method for this? Should I do
> something like,
>
> #if BITS_PER_LONG = 64
> shiftwidth = 48
> #else if BITS_PER_LONG = 32
> shiftwidth = 16
> #endif
I'd probably write some macros that access the parts of the longs you
want to have/set and put these into some header file.
MfG, JBG
--
Jan-Benedict Glaw jbglaw@lug-owl.de +49-172-7608481
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