os_mem.lst

uCOS-II_2.52在51上的移植程序

              /*
              *********************************************************************************************************
              *                                         RELEASE A MEMORY BLOCK
              *
              * Description : Returns a memory block to a partition
              *
              * Arguments   : pmem    is a pointer to the memory partition control block
              *
              *               pblk    is a pointer to the memory block being released.
              *
              * Returns     : OS_NO_ERR            if the memory block was inserted into the partition
              *               OS_MEM_FULL          if you are returning a memory block to an already FULL memory 
              *                                    partition (You freed more blocks than you allocated!)
              *               OS_MEM_INVALID_PMEM  if you passed a NULL pointer for 'pmem'
              *               OS_MEM_INVALID_PBLK  if you passed a NULL pointer for the block to release.
              *********************************************************************************************************
              */
              
              INT8U  OSMemPut (OS_MEM  *pmem, void *pblk)
              {
                
                  
                  
              #if OS_ARG_CHK_EN > 0
                  if (pmem == (OS_MEM *)0) {                   /* Must point to a valid memory partition             */
                      return (OS_MEM_INVALID_PMEM);
                  }
                  if (pblk == (void *)0) {                     /* Must release a valid block                         */
                      return (OS_MEM_INVALID_PBLK);
                  }
              #endif
                  OS_ENTER_CRITICAL();
                  if (pmem->OSMemNFree >= pmem->OSMemNBlks) {  /* Make sure all blocks not already returned          */
                      OS_EXIT_CRITICAL();
                      return (OS_MEM_FULL);
                  }
C51 COMPILER V7.50   OS_MEM                                                                08/08/2005 11:36:45 PAGE 4   

                  *(void **)pblk      = pmem->OSMemFreeList;   /* Insert released block into free block list         */
                  pmem->OSMemFreeList = pblk;
                  pmem->OSMemNFree++;                          /* One more memory block in this partition            */
                  OS_EXIT_CRITICAL();
                  return (OS_NO_ERR);                          /* Notify caller that memory block was released       */
              }
              /*$PAGE*/
              /*
              *********************************************************************************************************
              *                                          QUERY MEMORY PARTITION
              *
              * Description : This function is used to determine the number of free memory blocks and the number of
              *               used memory blocks from a memory partition.
              *
              * Arguments   : pmem    is a pointer to the memory partition control block
              *
              *               pdata   is a pointer to a structure that will contain information about the memory
              *                       partition.
              *
              * Returns     : OS_NO_ERR            If no errors were found.
              *               OS_MEM_INVALID_PMEM  if you passed a NULL pointer for 'pmem'
              *               OS_MEM_INVALID_PDATA if you passed a NULL pointer for the block to release.
              *********************************************************************************************************
              */
              
              #if OS_MEM_QUERY_EN > 0
              INT8U  OSMemQuery (OS_MEM *pmem, OS_MEM_DATA *ppdata)
              {
              
                  
                  
              #if OS_ARG_CHK_EN > 0
                  if (pmem == (OS_MEM *)0) {                   /* Must point to a valid memory partition             */
                      return (OS_MEM_INVALID_PMEM);
                  }
                  if (ppdata == (OS_MEM_DATA *)0) {             /* Must release a valid storage area for the data     */
                      return (OS_MEM_INVALID_PDATA);
                  }
              #endif
                  OS_ENTER_CRITICAL();
                  ppdata->OSAddr     = pmem->OSMemAddr;
                  ppdata->OSFreeList = pmem->OSMemFreeList;
                  ppdata->OSBlkSize  = pmem->OSMemBlkSize;
                  ppdata->OSNBlks    = pmem->OSMemNBlks;
                  ppdata->OSNFree    = pmem->OSMemNFree;
                  OS_EXIT_CRITICAL();
                  ppdata->OSNUsed    = ppdata->OSNBlks - ppdata->OSNFree;
                  return (OS_NO_ERR);
              }
              #endif                                           /* OS_MEM_QUERY_EN                                    */
              /*$PAGE*/
              /*
              *********************************************************************************************************
              *                                    INITIALIZE MEMORY PARTITION MANAGER
              *
              * Description : This function is called by uC/OS-II to initialize the memory partition manager.  Your
              *               application MUST NOT call this function.
              *
              * Arguments   : none
              *
              * Returns     : none
              *
C51 COMPILER V7.50   OS_MEM                                                                08/08/2005 11:36:45 PAGE 5   

              * Note(s)    : This function is INTERNAL to uC/OS-II and your application should not call it.
              *********************************************************************************************************
              */
              
              void  OS_MemInit (void)
              {
              #if OS_MAX_MEM_PART == 1
                  OSMemFreeList                = (OS_MEM *)&OSMemTbl[0]; /* Point to beginning of free list          */
                  OSMemFreeList->OSMemFreeList = (void *)0;              /* Initialize last node                     */
                  OSMemFreeList->OSMemAddr     = (void *)0;              /* Store start address of memory partition  */
                  OSMemFreeList->OSMemNFree    = 0;                      /* No free blocks                           */
                  OSMemFreeList->OSMemNBlks    = 0;                      /* No blocks                                */
                  OSMemFreeList->OSMemBlkSize  = 0;                      /* Zero size                                */
              #endif
              
              #if OS_MAX_MEM_PART >= 2
                  OS_MEM  *pmem;
                  INT16U   i;
              
              
                  pmem = (OS_MEM *)&OSMemTbl[0];                    /* Point to memory control block (MCB)           */
                  for (i = 0; i < (OS_MAX_MEM_PART - 1); i++) {     /* Init. list of free memory partitions          */
                      pmem->OSMemFreeList = (void *)&OSMemTbl[i+1]; /* Chain list of free partitions                 */
                      pmem->OSMemAddr     = (void *)0;              /* Store start address of memory partition       */
                      pmem->OSMemNFree    = 0;                      /* No free blocks                                */
                      pmem->OSMemNBlks    = 0;                      /* No blocks                                     */
                      pmem->OSMemBlkSize  = 0;                      /* Zero size                                     */
                      pmem++;
                  }
                  pmem->OSMemFreeList = (void *)0;                  /* Initialize last node                          */
                  pmem->OSMemAddr     = (void *)0;                  /* Store start address of memory partition       */
                  pmem->OSMemNFree    = 0;                          /* No free blocks                                */
                  pmem->OSMemNBlks    = 0;                          /* No blocks                                     */
                  pmem->OSMemBlkSize  = 0;                          /* Zero size                                     */
              
                  OSMemFreeList       = (OS_MEM *)&OSMemTbl[0];     /* Point to beginning of free list               */
              #endif
              }
              #endif                                           /* OS_MEM_EN                                          */


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =   ----    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)