UIO.h

#ifndef ZCU_UIO_H_INCLUDED
#define ZCU_UIO_H_INCLUDED
#include <unistd.h>
#include <stdint.h>
#include <string>
 
namespace pflib {
 
  class UIO {
  public:
    UIO(const std::string& dev, size_t size=4096);
    ~UIO();
 
    uint32_t read(size_t i) { return (i<size_)?(ptr_[i]):(0xDEADB33F); }
 
    void write(size_t where, uint32_t what);
 
    uint32_t readMasked(size_t where, uint32_t mask) { return (read(where)&mask)>>first_bit_set(mask); }
 
    void writeMasked(size_t where, uint32_t mask, uint32_t val) { rmw(where,mask,(val<<first_bit_set(mask))&mask); }
    
    void rmw(size_t where, uint32_t bits_to_modify, uint32_t newval);
  private:
    int first_bit_set(uint32_t mask) {
      int i;
      for (i=0; i<32; i++)
    if ((mask & (1<<i))!=0) return i;
      return 32;
    }
    size_t size_;
    uint32_t* ptr_;
    int handle_;
  };
  class UIO {…};
}
#endif