sys/arch/alpha/stand/netboot/getsecs.c

   1 /*      $NetBSD: getsecs.c,v 1.8 2009/01/12 11:04:00 tsutsui Exp $      */
   2
   3 #include <sys/param.h>
   4
   5 #include <netinet/in.h>
   6 #include <netinet/in_systm.h>
   7
   8 #include <lib/libsa/stand.h>
   9 #include <lib/libsa/net.h>
  10
  11 #include "include/prom.h"
  12 #include "include/rpb.h"
  13
  14 satime_t
  15 getsecs(void)
  16 {
  17         static uint64_t tnsec;
  18         static uint64_t lastpcc, wrapsecs;
  19         uint64_t curpcc;
  20
  21         if (tnsec == 0) {
  22                 tnsec = 1;
  23                 lastpcc = alpha_rpcc() & 0xffffffff;
  24                 wrapsecs = (0xffffffff /
  25                     ((struct rpb *)HWRPB_ADDR)->rpb_cc_freq) + 1;
  26
  27 #if 0
  28                 printf("getsecs: cc freq = %lu, time to wrap = %lu\n",
  29                     ((struct rpb *)HWRPB_ADDR)->rpb_cc_freq, wrapsecs);
  30 #endif
  31         }
  32
  33         curpcc = alpha_rpcc() & 0xffffffff;
  34         if (curpcc < lastpcc)
  35                 curpcc += 0x100000000;
  36
  37         tnsec += ((curpcc - lastpcc) * 1000000000) / ((struct rpb *)HWRPB_ADDR)->rpb_cc_freq;
  38         lastpcc = curpcc;
  39
  40         return (tnsec / 1000000000);
  41 }