intr.h

DSP系統設計和BIOS編程及應用實例-書籍光碟範例-第10章

/* INTR_GLOBAL_ENABLE - enables all masked interrupts by setting the GIE      */
/*              bit (bit 0) in the CSR                                        */
/*----------------------------------------------------------------------------*/
#define INTR_GLOBAL_ENABLE() \
        SET_REG_BIT(CSR, GIE)

/*----------------------------------------------------------------------------*/
/* INTR_GLOBAL_DISABLE - disables all masked interrupts by clearing the GIE   */
/*               (bit 0) in the CSR.                                          */
/*----------------------------------------------------------------------------*/
#define INTR_GLOBAL_DISABLE() \
        RESET_REG_BIT(CSR, GIE)

/*----------------------------------------------------------------------------*/
/* INTR_ENABLE - enable interrupt by setting flag in IER                      */
/*----------------------------------------------------------------------------*/
#define INTR_ENABLE(bit) \
        SET_REG_BIT(IER,bit) 

/*----------------------------------------------------------------------------*/
/* INTR_DISABLE - disable interrupt by clearing flag in IER                   */
/*----------------------------------------------------------------------------*/
#define INTR_DISABLE(bit) \
        RESET_REG_BIT(IER,bit) 

/*----------------------------------------------------------------------------*/
/* INTR_CHECK_FLAG - checks status of indicated interrupt bit in IFR          */
/*----------------------------------------------------------------------------*/
#define INTR_CHECK_FLAG(bit) \
        (IFR & MASK_BIT(bit) ? 1 : 0)

/*----------------------------------------------------------------------------*/
/* INTR_SET_FLAG - manually sets indicated interrupt by writing to ISR        */
/*----------------------------------------------------------------------------*/
#define INTR_SET_FLAG(bit) \
        (ISR = MASK_BIT(bit))

/*----------------------------------------------------------------------------*/
/* INTR_CLR_FLAG - manually clears indicated interrupt by writing 1 to ICR    */
/*----------------------------------------------------------------------------*/
#define INTR_CLR_FLAG(bit) \
        (ICR = MASK_BIT(bit))

/*----------------------------------------------------------------------------*/
/* INTR_SET_MAP  - maps a CPU interrupt specified by intr to the interrupt src*/
/*            specified by val.  Sel is used to select between the low and    */
/*            high interrupt_multiplexer registers.                           */
/*----------------------------------------------------------------------------*/
#define INTR_SET_MAP(intsel,val,sel) \
        (sel ? LOAD_FIELD(INTR_MULTIPLEX_HIGH_ADDR,val,intsel,INTSEL_SZ) : \
               LOAD_FIELD(INTR_MULTIPLEX_LOW_ADDR, val,intsel,INTSEL_SZ ))

/*----------------------------------------------------------------------------*/
/* INTR_GET_ISN - returns the ISN value in the selected Interrupt Multiplexer */
/*                register for the interrupt selected by intsel               */
/*----------------------------------------------------------------------------*/
#define INTR_GET_ISN(intsel,sel) \
        (sel ? GET_FIELD(INTR_MULTIPLEX_HIGH_ADDR,intsel,INTSEL_SZ) : \
               GET_FIELD(INTR_MULTIPLEX_LOW_ADDR, intsel, INTSEL_SZ))

/*----------------------------------------------------------------------------*/
/* INTR_MAP_RESET - resets the interrupt multiplexer maps to their default val*/
/*----------------------------------------------------------------------------*/
#define INTR_MAP_RESET() \
        { REG_WRITE (INTR_MULTIPLEX_HIGH_ADDR,IMH_RESET_VAL); \
          REG_WRITE (INTR_MULTIPLEX_LOW_ADDR, IML_RESET_VAL); }

/*----------------------------------------------------------------------------*/
/* INTR_EXT_POLARITY - assigns external interrupt external priority.          */
/*                    val = 0 (normal), val = 1 (inverted)                    */
/*----------------------------------------------------------------------------*/
#define INTR_EXT_POLARITY(bit,val) \
        (val ? SET_BIT(EXTERNAL_INTR_POL_ADDR,bit) : \
               RESET_BIT(EXTERNAL_INTR_POL_ADDR,bit))


/*----------------------------------------------------------------------------*/
/* GLOBAL VARIABLES                                                           */
/*----------------------------------------------------------------------------*/
extern unsigned int istb;
extern unsigned int NMI, RESV1, RESV2;
extern unsigned int unexp_int04, unexp_int05, unexp_int06, unexp_int07;
extern unsigned int unexp_int08, unexp_int09, unexp_int10, unexp_int11;
extern unsigned int unexp_int12, unexp_int13, unexp_int14, unexp_int15;

/*----------------------------------------------------------------------------*/
/* FUNCTIONS                                                                  */
/*----------------------------------------------------------------------------*/
extern void interrupt c_int00(void);

void intr_reset(void);
void intr_init(void);
void intr_hook(void (*fp)(void),int cpu_intr);

__INLINE void intr_map(int cpu_intr,int isn);
__INLINE int intr_isn(int cpu_intr);
__INLINE int intr_get_cpu_intr(int isn);


#if _INLINE
/* intr_map() - Place isn value in Interrupt Multiplexer Register in INTSEL   */
/*              field indicated by cpu_intr.                                  */
                                          
static inline void intr_map(int cpu_intr,int isn)
{
  int intsel;
  int sel;

  if (cpu_intr > CPU_INT9)
    sel=1;
  else
    sel= 0;

  intsel= ((cpu_intr - CPU_INT4) * INTSEL_SZ) - (sel * 30);
  if (intsel > INTSEL6)
    intsel++;

  INTR_SET_MAP(intsel,isn,sel);
}


/* intr_isn() - return isn in interrupt selector corresponding to cpu_intr    */
static inline int intr_isn(int cpu_intr)
{

  int intsel;
  int sel;

  if (cpu_intr > CPU_INT9)
    sel= 1;
  else
    sel= 0;

  intsel= ((cpu_intr - CPU_INT4) * INTSEL_SZ) - (sel * 30);
  if (intsel > INTSEL6)
    intsel++;

  return(INTR_GET_ISN(intsel,sel));
}

/* intr_get_cpu_intr() - return cpu interrupt corresponding to isn in         */
/*                       interrupt selector register.  If the isn is not      */
/*                       mapped, return -1                                    */
static inline int intr_get_cpu_intr(int isn)
{
  int i;
  for (i= CPU_INT4;i<=CPU_INT15;i++)
  {
    if (intr_isn(i) == isn)
      return(i);
  }
  return(-1);
}

#endif /* _INLINE */

#undef __INLINE    
#endif /* _INTR_H_ */