util/romcc/tests/simple_test3.c

   1 static void spd_set_drb(void)
   2 {
   3         /*
   4          * Effects:     Uses serial presence detect to set the
   5          *              DRB registers which holds the ending memory address assigned
   6          *              to each DIMM.
   7          */
   8         unsigned end_of_memory;
   9         unsigned device;
  10
  11         end_of_memory = 0; /* in multiples of 8MiB */
  12         device = 0x50;
  13         while (device <= 0x53) {
  14                 unsigned side1_bits, side2_bits;
  15                 int byte, byte2;
  16
  17                 side1_bits = side2_bits = -1;
  18
  19                 /* rows */
  20                 byte = -1;
  21                 if (1) {
  22                         /* now I have the ram size in bits as a power of two (less 1) */
  23                         /* Make it mulitples of 8MB */
  24                         side1_bits -= 25;
  25                 }
  26
  27                 /* Compute the end address for the DRB register */
  28                 /* Only process dimms < 2GB (2^8 * 8MB) */
  29                 if (1) {
  30                         end_of_memory += side1_bits;
  31                 }
  32                 __builtin_outl(end_of_memory, 0x1234);
  33
  34                 if (1) {
  35                         end_of_memory += side2_bits;
  36                 }
  37         }
  38 }