Re: le32_to_cpu() help...
dony (dony.he@huawei.com.cn)
Wed, 3 Nov 1999 02:31:09 +0800
On Tue, 02 Nov 1999, Jes Sorensen wrote:
> >>>>> "dony" == dony <dony.he@huawei.com.cn> writes:
>
> dony> Hi,
>
> dony> What role does le32_to_cpu() or cpu_to_le32() play in
> dony> kernel? Why do we need these two functions? They seem to
> dony> translate a value from big-endian to little-endian or vice
> dony> versa, but I don't know why we need do this. Thanks.
>
> They translate data to little endian from big endian on big endian
> CPUs, on little endian CPUs like the x86 they are noops. We need these
> because some hardware and other things like file systems wants data in
> little endian order no matter what type of system you are running on.
>
Then when do we use le32_to_cpu( ) , and when do we use cpu_to_le32( )?
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dony.he@huawei.com.cn
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