rdmalloc.c

嵌入式系统中文件系统源代码

/*************************************************************
File Name: RdMalloc.c (RAMDisk 4.1)				     *
**************************************************************
Programmer: chilong
Last Modified Date: 2001/8/31
Compiler : GNU Cross-compiler/SDS
Platform : ARM
Usage :
*************************************************************/

/*************************************************************
                      History
**************************************************************/
/*
 * Version: 4.1
 * Date 2001/8/31
 *
 */

/*************************************************************
                      Global Definitions
**************************************************************/

/*************************************************************
 		  	Header Files
**************************************************************/
#include <sys/syscall.h>

//#include <ansi_c/stdio.h>
/**** modified by chilong 8/23/2001 ****/
#include <stdio.h>
/**** modified by chilong 8/23/2001 ****/

//#include "myansi.h"
#include <ramdisk.h>
#include <dskblk.h>



#ifdef RAMDISK_ID

/*************************************************************
Function: RD_ramdisk_malloc
Description:
	allocate the needed size
Input:
	wantSize - the size of the memory
	blockType - what this block will be used for
Output:
	void* pointer which indicates the start position of the
	allocated memory
**************************************************************/
void* RD_ramdisk_malloc(unsigned long wantSize, int blockType)
{
  struct diskBlock* blk;
  
  blk = RD_getBlock(wantSize);
  
  if (blk == NULL)
  	return NULL;
  	
  if (blockType < BLOCK_FREE || blockType > BLOCK_FOR_DLL)
  	return NULL;
  	
  // this block is for dll
  blk->status = blockType;
  
  return blk;
}

/*************************************************************
Function: RD_ramdisk_free
Description:
	free the memory that the pointer points to 
Input:
Output:
**************************************************************/
void RD_ramdisk_free(void *pointer)
{
  RD_freeBlock(pointer);  
}
#endif