I understood that there is the possibility to define different address
spaces, that could be addressable via special instructions. Essentially
the minimum should be "How to write" and "How to read" to or from the
special space, I mean through which instructions it to be implemented
the access to the special address space.
The address space may not only be used for special hardware instructions
needed to access some special space, but could just be e.g. to use an
area of memory that does not support ECC ( error correcting code ) and
make the memory to support ECC writing e.g. for each 4 bytes a
supplementary byte that contains the ECC code, and checking and
correcting accordingly during read.
Another example could be to write the memory in big endian instead than
in small endian mode or viceversa.
What I need is a specific example on e.g. how to implement endianess
reversal just as an example case (as it is simple enough to describe)
Where do I have to write those instructions in the source code EXACTLY !!!
Thanks for any answer or hint!
George Kourtis
