c_main_neuron_common.h

/*
 * Copyright (c) 2017 The University of Manchester
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include <stdbool.h>
#include <stdint.h>
#include <debug.h>
 
#include <data_specification.h>
 
#include "neuron.h"
 
uint64_t udiv64(uint64_t num, uint64_t den) {
 
    uint64_t quot = 0;
    uint64_t qbit = 1;
 
    if (den == 0) {
        /* Intentional divide by zero, without
           triggering a compiler warning which
           would abort the build */
        return 1/((unsigned)den);
    }
 
    /* Left-justify denominator and count shift */
    while ((int64_t) den >= 0) {
        den <<= 1;
        qbit <<= 1;
    }
 
    while (qbit) {
        if (den <= num) {
            num -= den;
            quot += qbit;
        }
        den >>= 1;
        qbit >>= 1;
    }
    return quot;
}
 
struct neuron_provenance {
    uint32_t current_timer_tick;
    uint32_t n_tdma_misses;
    uint32_t earliest_send;
    uint32_t latest_send;
};
 
struct neuron_regions {
    uint32_t core_params;
    uint32_t neuron_params;
    uint32_t current_source_params;
    uint32_t neuron_recording;
    uint32_t initial_values;
};
 
extern uint32_t time;
 
extern uint32_t latest_send_time;
 
extern uint32_t earliest_send_time;
 
static inline void store_neuron_provenance(struct neuron_provenance *prov) {
    prov->current_timer_tick = time;
    prov->n_tdma_misses = 0;
    prov->earliest_send = earliest_send_time;
    prov->latest_send = latest_send_time;
}
 
static inline bool initialise_neuron_regions(
        data_specification_metadata_t *ds_regions,
        struct neuron_regions regions, uint32_t *n_rec_regions_used) {
 
    // Set up the neurons
    if (!neuron_initialise(
            data_specification_get_region(regions.core_params, ds_regions),
            data_specification_get_region(regions.neuron_params, ds_regions),
            data_specification_get_region(regions.current_source_params, ds_regions),
            data_specification_get_region(regions.neuron_recording, ds_regions),
            data_specification_get_region(regions.initial_values, ds_regions),
            n_rec_regions_used)) {
        return false;
    }
 
    return true;
}