/**
* @brief Iterates over all installed interrupt handler of a vector.
*
* @ingroup bsp_interrupt
*
* @return In addition to the standard status codes this function returns
* RTEMS_INTERNAL_ERROR if the BSP interrupt support is not initialized.
*
* @see rtems_interrupt_handler_iterate().
*/
static rtems_status_code bsp_interrupt_handler_iterate(
rtems_vector_number vector,
rtems_interrupt_per_handler_routine routine,
void *arg
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
bsp_interrupt_handler_entry *current = NULL;
rtems_option options = 0;
rtems_vector_number index = 0;
/* Check parameters and system state */
if (!bsp_interrupt_is_initialized()) {
return RTEMS_INTERNAL_ERROR;
} else if (!bsp_interrupt_is_valid_vector(vector)) {
return RTEMS_INVALID_ID;
} else if (rtems_interrupt_is_in_progress()) {
return RTEMS_CALLED_FROM_ISR;
}
/* Lock */
sc = bsp_interrupt_lock();
if (sc != RTEMS_SUCCESSFUL) {
return sc;
}
/* Interate */
index = bsp_interrupt_handler_index(vector);
current = &bsp_interrupt_handler_table [index];
if (!bsp_interrupt_is_empty_handler_entry(current)) {
do {
options = bsp_interrupt_is_handler_unique(index) ?
RTEMS_INTERRUPT_UNIQUE : RTEMS_INTERRUPT_SHARED;
routine(arg, current->info, options, current->handler, current->arg);
current = current->next;
} while (current != NULL);
}
/* Unlock */
sc = bsp_interrupt_unlock();
if (sc != RTEMS_SUCCESSFUL) {
return sc;
}
return RTEMS_SUCCESSFUL;
}
bool bsp_interrupt_handler_is_empty(rtems_vector_number vector)
{
rtems_vector_number index = 0;
bsp_interrupt_handler_entry *head = NULL;
bool empty;
/* For use in interrupts so no lock. */
/* Get handler table index */
index = bsp_interrupt_handler_index(vector);
/* Get head entry of the handler list for the vector */
head = &bsp_interrupt_handler_table [index];
empty = bsp_interrupt_is_empty_handler_entry(head);
return empty;
}
static inline bool bsp_interrupt_allocate_handler_index(
rtems_vector_number vector,
rtems_vector_number *index
)
{
#ifdef BSP_INTERRUPT_USE_INDEX_TABLE
rtems_vector_number i = 0;
/* The first entry will remain empty */
for (i = 1; i < BSP_INTERRUPT_HANDLER_TABLE_SIZE; ++i) {
const bsp_interrupt_handler_entry *e = &bsp_interrupt_handler_table [i];
if (bsp_interrupt_is_empty_handler_entry(e)) {
*index = i;
return true;
}
}
return false;
#else
*index = vector;
return true;
#endif
}
/**
* @brief Installs an interrupt handler.
*
* @ingroup bsp_interrupt
*
* @return In addition to the standard status codes this function returns:
* - If the BSP interrupt support is not initialized RTEMS_INTERNAL_ERROR will
* be returned.
* - If not enough memory for a new handler is available RTEMS_NO_MEMORY will
* be returned
*
* @see rtems_interrupt_handler_install()
*/
static rtems_status_code bsp_interrupt_handler_install(
rtems_vector_number vector,
const char *info,
rtems_option options,
rtems_interrupt_handler handler,
void *arg
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
rtems_interrupt_level level;
rtems_vector_number index = 0;
bsp_interrupt_handler_entry *head = NULL;
bsp_interrupt_handler_entry *tail = NULL;
bsp_interrupt_handler_entry *current = NULL;
bsp_interrupt_handler_entry *match = NULL;
bool enable_vector = false;
/* Check parameters and system state */
if (!bsp_interrupt_is_initialized()) {
return RTEMS_INTERNAL_ERROR;
} else if (!bsp_interrupt_is_valid_vector(vector)) {
return RTEMS_INVALID_ID;
} else if (handler == NULL) {
return RTEMS_INVALID_ADDRESS;
} else if (rtems_interrupt_is_in_progress()) {
return RTEMS_CALLED_FROM_ISR;
}
/* Lock */
sc = bsp_interrupt_lock();
if (sc != RTEMS_SUCCESSFUL) {
return sc;
}
/* Get handler table index */
index = bsp_interrupt_handler_index(vector);
/* Get head entry of the handler list for current vector */
head = &bsp_interrupt_handler_table [index];
if (bsp_interrupt_is_empty_handler_entry(head)) {
/*
* No real handler installed yet. So allocate a new index in
* the handler table and fill the entry with life.
*/
if (bsp_interrupt_allocate_handler_index(vector, &index)) {
rtems_interrupt_disable(level);
bsp_interrupt_handler_table [index].handler = handler;
bsp_interrupt_handler_table [index].arg = arg;
#ifdef BSP_INTERRUPT_USE_INDEX_TABLE
bsp_interrupt_handler_index_table [vector] = index;
#endif
rtems_interrupt_enable(level);
bsp_interrupt_handler_table [index].info = info;
} else {
/* Handler table is full */
bsp_interrupt_unlock();
return RTEMS_NO_MEMORY;
}
/* This is the first handler so enable the vector later */
enable_vector = true;
} else {
/* Ensure that a unique handler remains unique */
if (
RTEMS_INTERRUPT_IS_UNIQUE(options)
|| bsp_interrupt_is_handler_unique(index)
) {
/*
* Tried to install a unique handler on a not empty
* list or there is already a unique handler installed.
*/
bsp_interrupt_unlock();
return RTEMS_RESOURCE_IN_USE;
}
/*
* Search for the list tail and check if the handler is already
* installed.
*/
current = head;
do {
if (current->handler == handler && current->arg == arg) {
match = current;
}
tail = current;
current = current->next;
} while (current != NULL);
/* Ensure the handler is not already installed */
if (match != NULL) {
/* The handler is already installed */
bsp_interrupt_unlock();
return RTEMS_TOO_MANY;
}
/* Allocate a new entry */
current = bsp_interrupt_allocate_handler_entry();
if (current == NULL) {
/* Not enough memory */
bsp_interrupt_unlock();
return RTEMS_NO_MEMORY;
}
/* Set entry */
current->handler = handler;
current->arg = arg;
current->info = info;
current->next = NULL;
/* Link to list tail */
rtems_interrupt_disable(level);
tail->next = current;
rtems_interrupt_enable(level);
}
/* Make the handler unique if necessary */
bsp_interrupt_set_handler_unique(index, RTEMS_INTERRUPT_IS_UNIQUE(options));
/* Enable the vector if necessary */
if (enable_vector) {
sc = bsp_interrupt_vector_enable(vector);
if (sc != RTEMS_SUCCESSFUL) {
bsp_interrupt_unlock();
return sc;
}
}
/* Unlock */
sc = bsp_interrupt_unlock();
if (sc != RTEMS_SUCCESSFUL) {
return sc;
}
return RTEMS_SUCCESSFUL;
}
