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annotate TaskManager/kernel/memory/MemHash.cc @ 874:188e8bc16aca draft

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new hash function
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Sun, 04 Jul 2010 19:17:10 +0900
parents c50f39fbb6ca
children 2919078d069f
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1 #include <stdio.h>
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2 #include <string.h>
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3 #include <stdlib.h>
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4 #include "MemHash.h"
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5
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6 unsigned int
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7 MemHash::hash(memaddr data0)
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8 {
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9 unsigned long data = (unsigned long)data0;
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10 #if ABIBIT>32
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11 register int i_PeRlHaSh = 8;
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12 #else
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13 register int i_PeRlHaSh = 4;
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14 #endif
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15 register uint32 hash_PeRlHaSh = 0;
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16 while (i_PeRlHaSh--) {
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17 hash_PeRlHaSh += data & 0xff;
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18 hash_PeRlHaSh += (hash_PeRlHaSh << 10);
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19 hash_PeRlHaSh ^= (hash_PeRlHaSh >> 6);
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20 data >>= 8;
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21 }
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22 hash_PeRlHaSh += (hash_PeRlHaSh << 3);
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23 hash_PeRlHaSh ^= (hash_PeRlHaSh >> 11);
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24 return (hash_PeRlHaSh + (hash_PeRlHaSh << 15));
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25 }
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26
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27 #if 0
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28 static unsigned short PRIME[8] = {
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29 0x002, 0x065, 0x0c7, 0x133, 0x191, 0x1f3, 0x259, 0x2bd,
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30 };
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32 int
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33 MemHash::hash(memaddr data0)
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34 {
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35 unsigned long data = (unsigned long)data0;
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36 int value = 0;
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37 int n = 0;
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38 long key;
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39
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40 for (uint32 i = 0; i < sizeof(memaddr) * 2; i ++) {
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41 key = data & 0xf;
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42 value += key * PRIME[n++ & 7];
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43 data >>= 4;
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44 }
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45 printf("hash value %0x => %0x\n",data0, value);
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46
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47 return value % hashSize;
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48 }
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49 #endif
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50
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51 MemHash::MemHash()
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52 {
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53 table = (MemorySegmentPtr*)malloc(tableSize);
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54 clear();
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55 }
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56
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57 int
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58 MemHash::put(memaddr key, MemorySegmentPtr data)
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59 {
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60 int hashval = hash(key);
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61
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62 for (int i = 0; i < hashSize/2; i++) {
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63 int index = (hashval + i*i)%hashSize;
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64
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65 if (table[index] == 0) { // 空の table に入れる
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66 table[index] = data;
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67 return index;
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68 }
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69 }
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70
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71 return -1;
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72 }
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73
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74 MemorySegmentPtr
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75 MemHash::get(memaddr key)
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76 {
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77 int hashval = hash(key);
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78
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79 for (int i = 0; i < hashSize/2; i++) {
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80 int index = (hashval + i*i)%hashSize;
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81
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82 if (table[index] != NULL &&
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83 table[index]->address == key) {
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84 printf("get hash value %0x\n",index);
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85 return table[index];
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86 }
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87 }
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89 return NULL;
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90 }
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92 void
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93 MemHash::remove(memaddr key)
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94 {
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95 int hashval = hash(key);
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96
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97 for (int i = 0; i < hashSize/2; i++) {
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98 int index = (hashval + i*i)%hashSize;
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99
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100 if (table[index] != NULL &&
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101 table[index]->address == key) {
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102 table[index] = NULL;
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103 }
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104 }
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105 }
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106
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107 void
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108 MemHash::clear(void)
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109 {
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110 bzero(table, tableSize);
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111 }
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112
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113 /* end */