util/romcc/tests/simple_test2.c

   1 void outl(unsigned int value, unsigned short port)
   2 {
   3         __builtin_outl(value, port);
   4 }
   5
   6 #define PIIX4_DEVFN 0x90
   7 #define SMBUS_MEM_DEVICE_START 0x50
   8 #define SMBUS_MEM_DEVICE_END 0x53
   9 #define SMBUS_MEM_DEVICE_INC 1
  10
  11
  12 static void spd_set_drb(void)
  13 {
  14         /*
  15          * Effects:     Uses serial presence detect to set the
  16          *              DRB registers which holds the ending memory address assigned
  17          *              to each DIMM.
  18          */
  19         unsigned end_of_memory;
  20         unsigned device;
  21
  22         end_of_memory = 0; /* in multiples of 8MiB */
  23         device = SMBUS_MEM_DEVICE_START;
  24         while (device <= SMBUS_MEM_DEVICE_END) {
  25                 unsigned side1_bits;
  26
  27                 side1_bits =  -1;
  28
  29                 /* Compute the end address for the DRB register */
  30                 /* Only process dimms < 2GB (2^8 * 8MB) */
  31                 if (side1_bits < 8) {
  32                         end_of_memory += (1 << side1_bits);
  33                 }
  34                 outl(end_of_memory, 0x1234);
  35         }
  36 }