linux读写cpu寄存器linux寄存器读linux操作cpu寄存器实例

• linux读写cpu寄存器
• linux寄存器读写
• linux操作cpu寄存器实例
• linux应用层读写寄存器代码

•     QString Mcu::get_cpu_serial_number()
      {
          QString serialNo;
          int fd = ::open("/dev/mem", O_RDWR | O_NDELAY);
          unsigned char *base = NULL;
  
          if ( fd < 0) {
           perror ("/dev/mem");
           return serialNo;
          }
  
          base = (unsigned char *)
                  ::mmap (NULL,  2*1024, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0x021bc000);////红色的是cpu datasheeet的实际寄存器地址，base返回的是虚拟地址地址
  
          if (base == MAP_FAILED) {
              ::close(fd);
              return serialNo;
          }
  
          serialNo.sprintf("%08lx-%08lx-%08lx-%08lx-%08lx-%08lx--%08lx",
                           *(volatile long *)(base+0x410),
                           *(volatile long *)(base+0x420),
                           *(volatile long *)(base+0x430),
                           *(volatile long *)(base+0x440),
                           *(volatile long *)(base+0x450),
                           *(volatile long *)(base+0x460),
                           *(volatile long *)(base+0x470)
                           );
          ::munmap(base, 2*1024);
          qDebug() << "CPID:" << serialNo << endl;
          ::close(fd);
          return serialNo;
      }