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    <p>I would use a combination of structs to rappresent the register and a pair of functions to handle them.</p> <p>In a <code>fpga_register.h</code> you would have something like</p> <pre><code>#define FPGA_READ = 1; #define FPGA_WRITE = 2; typedef struct register_t { char permissions; } FPGARegister; FPGARegister* fpga_init(void* address, char permissions); int fpga_write(FPGARegister* register, void* value); int fpga_read(FPGARegister* register, void* value); </code></pre> <p>with READ and WRITE in xor to express permissions.</p> <p>Than in the <code>fpga_register.c</code> you would define a new struct</p> <pre><code>typedef struct register_t2 { char permissions; void * address; } FPGARegisterReal; </code></pre> <p>so that you returns a pointer to it instead of a pointer to <code>FPGARegister</code> on <code>fpga_init</code>.</p> <p>Then, on <code>fpga_read</code> and <code>fpga_write</code> you check the permissions and </p> <ul> <li>if the operetion is allowed, cast back the <code>FPGARegister</code> from the argument to a <code>FPGARegisterReal</code>, execute the desired action (set or read the value) and return a success code</li> <li>if the operation is not allowed, just return an error code</li> </ul> <p>This way, no one including the header file will be able to access the <code>FPGARegisterReal</code> structure, and thus it will not have direct access to the register address. Obviously, one could hack it, but I'm quite sure that such intentional hacks are not your actual concerns.</p>
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