linux读写cpu寄存器linux寄存器读linux操作cpu寄存器实例

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;
}