/*!
* \brief This function initializes the Multi Core Communication subsystem for a given node.
*
* This function should only be called once per node (once in MQX, once per process in Linux).
*
* \param[in] node Node number that will be used in endpoints created by this process.
*
* \return MCC_SUCCESS
* \return MCC_ERR_SEMAPHORE (semaphore handling error)
* \return MCC_ERR_INT (interrupt registration error)
*
* \see mcc_destroy
* \see MCC_BOOKEEPING_STRUCT
*/
int mcc_initialize(MCC_NODE node)
{
int i,j = 0;
int return_value = MCC_SUCCESS;
MCC_SIGNAL tmp_signals_received = {(MCC_SIGNAL_TYPE)0, (MCC_CORE)0, (MCC_NODE)0, (MCC_PORT)0};
#if (MCC_OS_USED == MCC_MQX)
for(i=0; i<MCC_MQX_LWEVENT_COMPONENTS_COUNT; i++) {
_lwevent_create(&lwevent_buffer_queued[i],0);
}
_lwevent_create(&lwevent_buffer_freed,0);
#endif
/* Initialize synchronization module */
return_value = mcc_init_semaphore(MCC_SHMEM_SEMAPHORE_NUMBER);
if(return_value != MCC_SUCCESS)
return return_value;
/* Register CPU-to-CPU interrupt for inter-core signaling */
//mcc_register_cpu_to_cpu_isr(MCC_CORE0_CPU_TO_CPU_VECTOR);
return_value = mcc_register_cpu_to_cpu_isr();
if(return_value != MCC_SUCCESS)
return return_value;
/* Initialize the bookeeping structure */
bookeeping_data = (MCC_BOOKEEPING_STRUCT *)MCC_BASE_ADDRESS;
MCC_DCACHE_INVALIDATE_MLINES(bookeeping_data, sizeof(MCC_BOOKEEPING_STRUCT));
if(strcmp(bookeeping_data->init_string, init_string) != 0) {
/* Zero it all - no guarantee Linux or uboot didnt touch it before it was reserved */
_mem_zero((void*) bookeeping_data, (_mem_size) sizeof(struct mcc_bookeeping_struct));
/* Set init_string in case it has not been set yet by another core */
mcc_memcpy((void*)init_string, bookeeping_data->init_string, (unsigned int)sizeof(bookeeping_data->init_string));
/* Set version_string */
mcc_memcpy((void*)version_string, bookeeping_data->version_string, (unsigned int)sizeof(bookeeping_data->version_string));
/* Initialize the free list */
bookeeping_data->free_list.head = &bookeeping_data->r_buffers[0];
bookeeping_data->free_list.tail = &bookeeping_data->r_buffers[MCC_ATTR_NUM_RECEIVE_BUFFERS-1];
/* Initialize receive buffers */
for(i=0; i<MCC_ATTR_NUM_RECEIVE_BUFFERS-1; i++) {
bookeeping_data->r_buffers[i].next = &bookeeping_data->r_buffers[i+1];
}
bookeeping_data->r_buffers[MCC_ATTR_NUM_RECEIVE_BUFFERS-1].next = null;
/* Initialize signal queues */
for(i=0; i<MCC_NUM_CORES; i++) {
for(j=0; j<MCC_MAX_OUTSTANDING_SIGNALS; j++) {
bookeeping_data->signals_received[i][j] = tmp_signals_received;
}
bookeeping_data->signal_queue_head[i] = 0;
bookeeping_data->signal_queue_tail[i] = 0;
}
/* Mark all endpoint ports as free */
for(i=0; i<MCC_ATTR_MAX_RECEIVE_ENDPOINTS; i++) {
bookeeping_data->endpoint_table[i].endpoint.port = MCC_RESERVED_PORT_NUMBER;
}
}
MCC_DCACHE_FLUSH_MLINES(bookeeping_data, sizeof(MCC_BOOKEEPING_STRUCT));
return return_value;
}
/*!
* \brief This function initializes the Multi Core Communication subsystem for a given node.
*
* This function should only be called once per node (once in MQX, once per a process in Linux).
* It tries to initialize the bookkeeping structure when the init_string member of this structure
* is not equal to MCC_INIT_STRING, i.e. when no other core had performed the initialization yet.
* Note, that this way of bookkeeping data re-initialization protection is not powerful enough and
* the user application should not rely on this method. Instead, the application should be designed
* to unambiguously assign the core that will perform the MCC initialization.
* Clear the shared memory before the first core is attempting to initialize the MCC
* (in some cases MCC_INIT_STRING remains in the shared memory after the application reset and could
* cause that the bookkeeping data structure is not initialized correctly).
*
* \param[in] node Node number that will be used in endpoints created by this process.
*
* \return MCC_SUCCESS
* \return MCC_ERR_SEMAPHORE (semaphore handling error)
* \return MCC_ERR_INT (interrupt registration error)
* \return MCC_ERR_VERSION (incorrect MCC version used - compatibility issue)
* \return MCC_ERR_OSSYNC (OS synchronization module(s) initialization failed)
*
* \see mcc_destroy
* \see MCC_BOOKEEPING_STRUCT
*/
int mcc_initialize(MCC_NODE node)
{
int i,j = 0;
int return_value = MCC_SUCCESS;
MCC_SIGNAL tmp_signals_received = {(MCC_SIGNAL_TYPE)0, {(MCC_CORE)0, (MCC_NODE)0, (MCC_PORT)0}};
/* Initialize synchronization module for shared data protection */
return_value = mcc_init_semaphore(MCC_SHMEM_SEMAPHORE_NUMBER);
if(return_value != MCC_SUCCESS)
return return_value;
/* Initialize all necessary OS synchronization module(s)
(for unblocking tasks waiting for new received data and for unblocking tasks waiting for a free buffer) */
return_value = mcc_init_os_sync();
if(return_value != MCC_SUCCESS)
return return_value;
/* Register CPU-to-CPU interrupt for inter-core signaling */
//mcc_register_cpu_to_cpu_isr(MCC_CORE0_CPU_TO_CPU_VECTOR);
return_value = mcc_register_cpu_to_cpu_isr();
if(return_value != MCC_SUCCESS)
return return_value;
/* Initialize the bookeeping structure */
bookeeping_data = (MCC_BOOKEEPING_STRUCT *)mcc_get_bookeeping_data();
MCC_DCACHE_INVALIDATE_MLINES(bookeeping_data, sizeof(MCC_BOOKEEPING_STRUCT));
if(strcmp(bookeeping_data->init_string, init_string) != 0) {
/* MCC not initialized yet, do it now */
/* Zero it all - no guarantee Linux or uboot didnt touch it before it was reserved */
memset((void*) bookeeping_data, 0, sizeof(struct mcc_bookeeping_struct));
/* Set init_string in case it has not been set yet by another core */
mcc_memcpy((void*)init_string, bookeeping_data->init_string, (unsigned int)sizeof(bookeeping_data->init_string));
/* Set version_string */
mcc_memcpy((void*)version_string, bookeeping_data->version_string, (unsigned int)sizeof(bookeeping_data->version_string));
/* Initialize the free list */
bookeeping_data->free_list.head = (MCC_RECEIVE_BUFFER*)MCC_MEM_VIRT_TO_PHYS(&bookeeping_data->r_buffers[0]);
bookeeping_data->free_list.tail = (MCC_RECEIVE_BUFFER*)MCC_MEM_VIRT_TO_PHYS(&bookeeping_data->r_buffers[MCC_ATTR_NUM_RECEIVE_BUFFERS-1]);
/* Initialize receive buffers */
for(i=0; i<MCC_ATTR_NUM_RECEIVE_BUFFERS-1; i++) {
bookeeping_data->r_buffers[i].next = (MCC_RECEIVE_BUFFER*)MCC_MEM_VIRT_TO_PHYS(&bookeeping_data->r_buffers[i+1]);
}
bookeeping_data->r_buffers[MCC_ATTR_NUM_RECEIVE_BUFFERS-1].next = null;
/* Initialize signal queues */
for(i=0; i<MCC_NUM_CORES; i++) {
for(j=0; j<MCC_MAX_OUTSTANDING_SIGNALS; j++) {
bookeeping_data->signals_received[i][j] = tmp_signals_received;
}
bookeeping_data->signal_queue_head[i] = 0;
bookeeping_data->signal_queue_tail[i] = 0;
}
/* Mark all endpoint ports as free */
for(i=0; i<MCC_ATTR_MAX_RECEIVE_ENDPOINTS; i++) {
bookeeping_data->endpoint_table[i].endpoint.port = MCC_RESERVED_PORT_NUMBER;
}
}
else {
/* MCC already initialized - check the major number of the version string to ensure compatibility */
if(strncmp(bookeeping_data->version_string, version_string, 4) != 0) {
return_value = MCC_ERR_VERSION;
}
}
MCC_DCACHE_FLUSH_MLINES(bookeeping_data, sizeof(MCC_BOOKEEPING_STRUCT));
return return_value;
}