reg_t.hpp

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#pragma once

#include "generate_mask_t.hpp"
#include <limits>

template
<
   typename mutability_policy_t,
   unsigned address,
   unsigned offset,
   unsigned width
>
struct reg_t
{
   static_assert(width > 0, "invalid field of zero width");
   static_assert(width + offset <= std::numeric_limits<unsigned>::digits,
      "register width overflow");

   static unsigned read()
   {
      return
         mutability_policy_t::read(
            reinterpret_cast<volatile unsigned *>(address),
            offset,
            generate_mask_t<offset, width>::value
         );
   }

   static void write(unsigned value)
   {
      mutability_policy_t::write(
         reinterpret_cast<volatile unsigned *>(address),
         offset,
         generate_mask_t<offset, width>::value,
         value
      );
   }

   static void set()
   {
      mutability_policy_t::set(
         reinterpret_cast<volatile unsigned *>(address),
         generate_mask_t<offset, width>::value
      );
   }

   static void clear()
   {
      mutability_policy_t::clear(
         reinterpret_cast<volatile unsigned *>(address),
         generate_mask_t<offset, width>::value
      );
   }
};