/**
*
* @brief Local allocate interrupt vector.
*
* @returns The allocated interrupt vector
*
*/
static int __LocalIntVecAlloc(
unsigned int irq, /* virtualized IRQ */
unsigned int priority /* get vector from <priority> group */
)
{
int vector;
if (handle_fixed_mapping(irq, &vector)) {
return vector;
}
/*
* Use the nanokernel utility function _IntVecAlloc(). A value of
* -1 will be returned if there are no free vectors in the requested
* priority.
*/
vector = _IntVecAlloc(priority);
__ASSERT(vector != -1, "No free vectors in the requested priority");
return vector;
}
int _SysIntVecAlloc(
unsigned int irq, /* virtualized IRQ */
unsigned int priority, /* get vector from <priority> group */
NANO_EOI_GET_FUNC * boiRtn, /* ptr to BOI routine; NULL if none */
NANO_EOI_GET_FUNC * eoiRtn, /* ptr to EOI routine; NULL if none */
void **boiRtnParm, /* BOI routine parameter, if any */
void **eoiRtnParm, /* EOI routine parameter, if any */
unsigned char *boiParamRequired, /* BOI routine parameter req? */
unsigned char *eoiParamRequired /* BOI routine parameter req? */
)
{
int vector;
ARG_UNUSED(boiRtnParm);
ARG_UNUSED(eoiRtnParm);
#if defined(DEBUG)
if ((priority > 15) || (irq > 15) && (irq != NANO_SOFT_IRQ))
return -1;
#endif
/* The PIC BOI does not require a parameter */
*boiParamRequired = 0;
/* Assume BOI is not required */
*boiRtn = (NANO_EOI_GET_FUNC)NULL;
if (irq != NANO_SOFT_IRQ) {
/* convert interrupt 'vector' to an interrupt controller IRQ
* number */
vector = INT_VEC_IRQ0 + irq;
/* mark vector as allocated */
_IntVecMarkAllocated(vector);
/* vector not handled by PIC, thus don't specify an EOI handler
*/
if (irq >= N_PIC_IRQS) {
*eoiRtn = (NANO_EOI_GET_FUNC)NULL;
return vector;
}
if (irq == PIC_MASTER_STRAY_INT_LVL) {
*boiRtn = (NANO_EOI_GET_FUNC)_i8259_boi_master;
} else if (irq == PIC_SLAVE_STRAY_INT_LVL) {
*boiRtn = (NANO_EOI_GET_FUNC)_i8259_boi_slave;
}
if (irq <= PIC_MASTER_STRAY_INT_LVL)
*eoiRtn = (NANO_EOI_GET_FUNC)_i8259_eoi_master;
else
*eoiRtn = (NANO_EOI_GET_FUNC)_i8259_eoi_slave;
*eoiParamRequired = 0;
} else {
/*
* Use the nanokernel utility function _IntVecAlloc() to
* allocate
* a vector for software generated interrupts.
*/
vector = _IntVecAlloc(priority);
*eoiRtn = (NANO_EOI_GET_FUNC)NULL;
}
return vector;
}
