Hint crc (void * list_ptr, Huint size, Huint * done) {
// done variable not used for slave accelerator calls
Hint result = SUCCESS;
// Get VHWTI
Huint vhwti_base = 0;
// Get VHWTI from PVRs
getpvr(1,&vhwti_base);
// Increment SW counter
Huint sw_counter = _hwti_get_accelerator_sw_counter( vhwti_base );
_hwti_set_accelerator_sw_counter( vhwti_base, ++sw_counter);
// if the size is more than 4k words,
// grab the amount of iterations you
// need to perform.
Huint iterations = size / BRAM_SIZE;
// If there is a remainder in this
// division, round up.
if ((size % BRAM_SIZE) != 0) {
iterations++;
}
Huint i = 0;
Huint new_size = 0;
Huint * new_list_ptr = 0;
for (i = 0; i < iterations; i++) {
// Calculate the size for this iteration
new_size = (size < (BRAM_SIZE*(i+1))) ? size-(BRAM_SIZE*i) : BRAM_SIZE;
// Calculate the starting pointer for this iteration. Typcasting
// may be repetitive here.
new_list_ptr = (Huint *) ((Huint *)list_ptr + BRAM_SIZE*i);
// Run crc in software
result = (sw_crc((void *) new_list_ptr, new_size));
if (result != SUCCESS) break;
} /* end of iterations loop */
return result;
}
Hint poly_crc (void * list_ptr, Huint size)
{
Hint result = SUCCESS;
// Use Accelerator?
Hbool use_accelerator = poly_init(CRC, size);
// Start transferring data to BRAM
if(transfer_dma( (void *) list_ptr, (void *) ACC_BRAMC, size *4))
return FAILURE;
if (use_accelerator) {
int e = 0;
putfslx( size, 0, FSL_DEFAULT);//send end address
putfslx( 0, 0, FSL_DEFAULT); //send start address
getfslx(e, 0, FSL_DEFAULT);
if (e != 1) return FAILURE;
} else {
Huint vhwti_base = 0;
// Get VHWTI from PVRs
getpvr(1,vhwti_base);
hthread_time_t start = hthread_time_get();
// Run crc in software
result = (sw_crc((void *) ACC_BRAMC, size));
hthread_time_t stop = hthread_time_get();
hthread_time_t diff;
hthread_time_diff(diff, stop,start);
volatile hthread_time_t * ptr = (hthread_time_t *) (vhwti_base + 0x100);
*ptr += diff;
}
// Start transferring data from BRAM
if(transfer_dma( (void *) ACC_BRAMC, (void *) list_ptr, size *4))
return FAILURE;
return result;
}
