tests/cr1.c

   1 int __init probe_base_port(int base)
   2 {
   3         int b = 0x300, e = 0x370;       /* this is the range of start addresses */
   4         volatile int fool, i;
   5
   6         if (base)
   7                 b = e = base;
   8         for (base = b; base <= e; base += 0x10) {
   9                 if (check_region(base, 0x10))
  10                         continue;
  11                 for (i = 0; i < 3; i++)
  12                         fool = inw(base + 2);   /* empty possibly uart_receive_buffer */
  13                 if ((inw(base + 6) & 0xffef) != 0x0001 ||       /* line_status */
  14                     (inw(base) & 0xad00) != 0)  /* data status */
  15                         continue;
  16                 return (base);
  17         }
  18         return 0;
  19 }
  20