127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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/*! \file taus.c
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* \brief random number generator per OAI component
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* \author Navid Nikaein
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* \date 2011 - 2014
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* \version 0.1
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* \email navid.nikaein@eurecom.fr
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* \warning
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* @ingroup util
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <math.h>
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#include "oml.h"
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unsigned int s0[MAX_NUM_COMPS], s1[MAX_NUM_COMPS], s2[MAX_NUM_COMPS], b[MAX_NUM_COMPS], r[MAX_NUM_COMPS];
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inline unsigned int taus(unsigned int comp)
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{
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b[comp] = (((s0[comp] << 13) ^ s0[comp]) >> 19);
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s0[comp] = (((s0[comp] & 0xFFFFFFFE) << 12)^ b[comp]);
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b[comp] = (((s1[comp] << 2) ^ s1[comp]) >> 25);
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s1[comp] = (((s1[comp] & 0xFFFFFFF8) << 4)^ b[comp]);
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b[comp] = (((s2[comp] << 3) ^ s2[comp]) >> 11);
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s2[comp] = (((s2[comp] & 0xFFFFFFF0) << 17)^ b[comp]);
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r[comp] = s0[comp] ^ s1[comp] ^ s2[comp];
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return r[comp];
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}
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void set_taus_seed(unsigned int seed_type)
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{
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unsigned int i; // i index of component
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for (i=MIN_NUM_COMPS; i < MAX_NUM_COMPS ; i ++) {
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switch (seed_type) {
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case 0: // use rand func
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if (i == 0) srand(time(NULL));
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s0[i] = ((unsigned int)rand());
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s1[i] = ((unsigned int)rand());
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s2[i] = ((unsigned int)rand());
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printf("Initial seeds use rand: s0[%d] = 0x%x, s1[%d] = 0x%x, s2[%d] = 0x%x\n", i, s0[i], i, s1[i], i, s2[i]);
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break;
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case 1: // use rand with seed
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if (i == 0) srand(0x1e23d851);
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s0[i] = ((unsigned int)rand());
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s1[i] = ((unsigned int)rand());
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s2[i] = ((unsigned int)rand());
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printf("Initial seeds use rand with seed : s0[%d] = 0x%x, s1[%d] = 0x%x, s2[%d] = 0x%x\n", i, s0[i], i, s1[i], i, s2[i]);
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break;
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default:
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break;
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}
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}
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}
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int get_rand (unsigned int comp)
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{
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if ((comp > MIN_NUM_COMPS) && (comp < MAX_NUM_COMPS))
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return r[comp];
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else {
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//LOG_E(RNG,"unknown component %d\n",comp);
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return -1;
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}
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}
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unsigned int dtaus(unsigned int comp, unsigned int a, unsigned b)
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{
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return (int) (((double)taus(comp)/(double)0xffffffff)* (double)(b-a) + (double)a);
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}
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/*
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#ifdef STANDALONE
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main() {
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unsigned int i,randomg, randphy;
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set_taus_seed(0);
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printf("dtaus %d \n",dtaus(PHY, 1000, 1000000));
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do {//for (i=0;i<10;i++){
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randphy = taus(PHY);
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randomg = taus(OTG);
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i++;
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// printf("rand for OMG (%d,0x%x) PHY (%d,0x%x)\n",OMG, randomg, PHY, randphy);
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} while (randphy != randomg);
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printf("after %d run: get rand for (OMG 0x%x, PHY 0x%x)\n",i, get_rand(OTG), get_rand(PHY));
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}
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#endif
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*/
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