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#include "common.h"

#include "support.h"

#include "spr_defs.h"

void tick_init(void)

{

  mtspr(SPR_SR, SPR_SR_TEE | mfspr(SPR_SR));

  mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT | ((IN_CLK/TICKS_PER_SEC) & SPR_TTMR_PERIOD));

}

void tick_interrupt(void)

{

  timestamp++;

  mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT | ((IN_CLK/TICKS_PER_SEC) & SPR_TTMR_PERIOD));

}

/*

  sleep for n timer-ticks

*/

void sleep(unsigned long sleep_time)

{

  unsigned long start_time;

  start_time = timestamp;

  while ( (timestamp - start_time) < sleep_time)

  ; /* do nothing */

}