target/linux/generic-2.4/files/crypto/ocf/kirkwood/cesa/mvLru.c

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  64
  65 #include "mvOs.h"
  66 #include "mvLru.h"
  67 /* LRU Cache support */
  68
  69
  70 /* Init LRU cache database */
  71 MV_LRU_CACHE*   mvLruCacheInit(int numOfEntries)
  72 {
  73     int             i;
  74     MV_LRU_CACHE*   pLruCache;
  75
  76     pLruCache = mvOsMalloc(sizeof(MV_LRU_CACHE));
  77     if(pLruCache == NULL)
  78     {
  79         return NULL;
  80     }
  81     memset(pLruCache, 0, sizeof(MV_LRU_CACHE));
  82
  83     pLruCache->table = mvOsMalloc(numOfEntries*sizeof(MV_LRU_ENTRY));
  84     if(pLruCache->table == NULL)
  85     {
  86         mvOsFree(pLruCache);
  87         return NULL;
  88     }
  89     memset(pLruCache->table, 0, numOfEntries*sizeof(MV_LRU_ENTRY));
  90     pLruCache->tableSize = numOfEntries;
  91
  92     for(i=0; i<numOfEntries; i++)
  93     {
  94         pLruCache->table[i].next = i+1;
  95         pLruCache->table[i].prev = i-1;
  96     }
  97     pLruCache->least = 0;
  98     pLruCache->most = numOfEntries-1;
  99
 100     return pLruCache;
 101 }
 102
 103 void    mvLruCacheFinish(MV_LRU_CACHE* pLruCache)
 104 {
 105     mvOsFree(pLruCache->table);
 106     mvOsFree(pLruCache);
 107 }
 108
 109 /* Update LRU cache database after using cache Index */
 110 void    mvLruCacheIdxUpdate(MV_LRU_CACHE* pLruHndl, int cacheIdx)
 111 {
 112     int prev, next;
 113
 114     if(cacheIdx == pLruHndl->most)
 115         return;
 116
 117     next = pLruHndl->table[cacheIdx].next;
 118     if(cacheIdx == pLruHndl->least)
 119     {
 120         pLruHndl->least = next;
 121     }
 122     else
 123     {
 124         prev = pLruHndl->table[cacheIdx].prev;
 125
 126         pLruHndl->table[next].prev = prev;
 127         pLruHndl->table[prev].next = next;
 128     }
 129
 130     pLruHndl->table[pLruHndl->most].next = cacheIdx;
 131     pLruHndl->table[cacheIdx].prev = pLruHndl->most;
 132     pLruHndl->most = cacheIdx;
 133 }
 134
 135 /* Delete LRU cache entry */
 136 void    mvLruCacheIdxDelete(MV_LRU_CACHE* pLruHndl, int cacheIdx)
 137 {
 138     int prev, next;
 139
 140     if(cacheIdx == pLruHndl->least)
 141         return;
 142
 143     prev = pLruHndl->table[cacheIdx].prev;
 144     if(cacheIdx == pLruHndl->most)
 145     {
 146         pLruHndl->most = prev;
 147     }
 148     else
 149     {
 150         next = pLruHndl->table[cacheIdx].next;
 151
 152         pLruHndl->table[next].prev = prev;
 153         pLruHndl->table[prev].next = next;
 154     }
 155     pLruHndl->table[pLruHndl->least].prev = cacheIdx;
 156     pLruHndl->table[cacheIdx].next = pLruHndl->least;
 157     pLruHndl->least = cacheIdx;
 158 }