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/* This file is part of test microkernel for OpenRISC 1000. */
/* (C) 2001 Simon Srot, srot@opencores.org */
 
#include "support.h"
#include "spr_defs.h"
#include "int.h"
 
#ifdef OR1K
 
/* Interrupt handlers table */
struct ihnd int_handlers[MAX_INT_HANDLERS];
 
/* Initialize routine */
int int_init()
{
  int i;
 
  for(i = 0; i < MAX_INT_HANDLERS; i++) {
    int_handlers[i].handler = 0;
    int_handlers[i].arg = 0;
  }
  mtspr(SPR_PICMR, 0x00000000);
 
  //set OR1200 to accept exceptions
  mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_IEE);
 
  return 0;
}
 
/* Add interrupt handler */ 
int int_add(unsigned long vect, void (* handler)(void *), void *arg)
{
  if(vect >= MAX_INT_HANDLERS)
    return -1;
 
  int_handlers[vect].handler = handler;
  int_handlers[vect].arg = arg;
 
  mtspr(SPR_PICMR, mfspr(SPR_PICMR) | (0x00000001L << vect));
 
  return 0;
}
 
/* Disable interrupt */ 
int int_disable(unsigned long vect)
{
  if(vect >= MAX_INT_HANDLERS)
    return -1;
 
  mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(0x00000001L << vect));
 
  return 0;
}
 
/* Enable interrupt */ 
int int_enable(unsigned long vect)
{
  if(vect >= MAX_INT_HANDLERS)
    return -1;
 
  mtspr(SPR_PICMR, mfspr(SPR_PICMR) | (0x00000001L << vect));
 
  return 0;
}
 
/* Main interrupt handler */
void int_main()
{
  unsigned long picsr = mfspr(SPR_PICSR);   //process only the interrupts asserted at signal catch, ignore all during process
  unsigned long i = 0;
 
  while(i < 32) {
    if((picsr & (0x01L << i)) && (int_handlers[i].handler != 0)) {
      (*int_handlers[i].handler)(int_handlers[i].arg); 
    }
    i++;
  }
 
  mtspr(SPR_PICSR, 0);      //clear interrupt status: all modules have level interrupts, which have to be cleared by software,
}                           //thus this is safe, since non processed interrupts will get re-asserted soon enough
 
 
#endif