On 10/4/07, Misbah khan [off-list ref] wrote:

Hi ...
I did followed you and it worked as well. I really Thank you for it.

At one Place i am doing memcpy() of floating point data to the memory mapped
registers, what could be the substitute of it like "memcpy_toio() " which is
suggested in the Book. I am working BE architecture.

I would really appreaciate if you would let me know the defineation of these
wrapper functions (in_be32,out_be32(),ioread32(),iowrite32(),etc) so that i
could have the clear idea of the reason for not directly dreferencing the
Pointer.

You don't want to directly dereference pointers to device registers
because you don't want the processor or compiler to reorder your
register accesses.  The in/out_* wrappers keeps the compiler from
reordering things, and the wrappers contain the 'sync' instruction
which prevents the processor from reordering operations at runtime.

g.
-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
grant.likely@secretlab.ca
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