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#include "spr-defs.h"

#include "or1200-utils.h"

#include "board.h" // For timer rate (IN_CLK, TICKS_PER_SEC)

/* For writing into SPR. */

void mtspr(unsigned long spr, unsigned long value)

{

  asm("l.mtspr\t\t%0,%1,0": : "r" (spr), "r" (value));

}

/* For reading SPR. */

unsigned long mfspr(unsigned long spr)

{

  unsigned long value;

  asm("l.mfspr\t\t%0,%1,0" : "=r" (value) : "r" (spr));

  return value;

}

/* Print out a character via simulator */

void sim_putc(unsigned char c)

{

  asm("l.addi\tr3,%0,0": :"r" (c));

  asm("l.nop %0": :"K" (NOP_PUTC));

}

/* print long */

void report(unsigned long value)

{

  asm("l.addi\tr3,%0,0": :"r" (value));

  asm("l.nop %0": :"K" (NOP_REPORT));

}

/* Loops/exits simulation */

void exit (int i)

{

  asm("l.add r3,r0,%0": : "r" (i));

  asm("l.nop %0": :"K" (NOP_EXIT));

  while (1);

}

/* Enable user interrupts */

void

cpu_enable_user_interrupts(void)

{

  /* Enable interrupts in supervisor register */

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

}

/* Tick timer variable */

unsigned long timer_ticks;

/* Tick timer functions */

/* Enable tick timer and interrupt generation */

void enable_timer(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));

}

/* Disable tick timer and interrupt generation */

void disable_timer(void)

{

  // Disable timer: clear it all!

  mtspr (SPR_SR, mfspr (SPR_SR) & ~SPR_SR_TEE);

  mtspr(SPR_TTMR, 0);

}

/* Timer increment - called by interrupt routine */

void timer_tick(void)

{

  timer_ticks++;

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

}

/* Reset tick counter */

void clear_timer_ticks(void)

{

  timer_ticks=0;

}

/* Get tick counter */

unsigned long get_timer_ticks(void)

{

  return timer_ticks;

}

/* Wait for 10ms */

void wait_10ms(void)

{

  unsigned long first_time = get_timer_ticks();

  while (first_time == get_timer_ticks());

}