memory.h

来自「这是操作系统中的内存管理的全部debug程序」· C头文件 代码 · 共 64 行

/******************************************************************************
 *
 * Module name: MemManager.c  $Revision:   1.1            Liteon Confidential
 *
 * Description:
 *
 *     This file includes prototypes, definitions, structures and variables
 *     used by the memory manager.
 *
 * Revision History:
 *
 * No.  Date      Who  Description of Change
 * ---  --------  ---  --------------------------------------------------------
 * 001 3/25/05     ***           Create    
 *
 ******************************************************************************/

/********  Global Definititions & Macros **************************************/

/* Determines whether start position is in 1200th or 2400s */
#define START_RES_2400


#define ASF        0       /* auto sheet feed   */
#define MANUAL     1       /* manual sheet feed */




/********  Global Variableble Declarations ************************************/

typedef struct MemSegmentHeader

        {
          Uint16            * pU16DataPointer;
          Uint32              U32DataSize;
          struct MemSegmentHeader * pLastSegment;
          struct MemSegmentHeader * pNextSegment;
          Uint8               fTrashed;
          Uint8               bReserved; /* for word alignment */
        } MemSegmentHeader;

/* Porting to ARM: can no longer use top bit of dataPointer to indicate trashed,
   instead mask trash bit to top of size */
#define DYNAMIC_MEMORY_SIZE ( U32DataSize ) ( U32DataSize & 0x7FFFFFFF )
#define TRASH_BIT ( U32DataSize ) ( U32DataSize & 0x8000000 )
#define SET_DYNAMIC_MEMORY_DATASIZE ( U32DataSize, newSize )  ( U32DataSize = ( TRASH_BIT ( U32DataSize ) & newSize)))
#define SET_TRASH_BIT ( U32DataSize ) ( U32DataSize |= 0x80000000 )


extern MemSegmentHeader * pMemoryFreeSpace;



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

void * Malloc ( Uint32 U32Size );
void * MallocSegment ( Uint32 U32RequestSize, Uint32 * U32AvailSize );
void Free ( void * pU16ReleaseData );


void InitMemoryManager ( void );