In short words, I want to do (void*)0x78000000 in Perl, a pointer to a address defiend by myself (without the help of C :-P). I've searched CPAN for XS and pointers but did not found anything related to my problem

Did you come across Sys::Mmap's hardwire() method in your travels?

Just reading the synopsis for this function:

       hardwire(VARIABLE, ADDRESS, LENGTH)
           Specifies the address in memory of a variable, possibly within a
           region you've "mmap()"ed another variable to. You must use the same
           precautions to keep the variable from being reallocated, and use
           "substr()" with an exact length. If you "munmap()" a region that a
           "hardwire()"ed variable lives in, the "hardwire()"ed variable will
           not automatically be "undef"ed. You must do this manually.

..and thought it just might be of use. Maybe try:

use Sys::Mmap;
# ...
Sys::Mmap::hardwire($address, 0x78000000, $kernel_size);
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