/***********************************************************************
**+
**  Module Name:  vmm.h
**
**  Description:  vmm defines
**
**  Written by:  John Tal
**
**
**  Modification history:
**
**  Date         Engineer     Mod #          Modification Description
**
**  12-FEB-1992  Tal          v 1.0-000      Initial release
**
***********************************************************************/


#ifdef VMM_H
#else
#define VMM_H

/*
**  Virtual Memory Manager
**
**   Blocks of memory from pvMosMemory are mapped into a link-list
**   of VMM_BLOCK_S which is ordered in descending order of size of sub-block
*/

#define VMM_MEMORY        0x01
#define VMM_DISK          0x02
 
#define VMM_OWNER_NONE    -1

#define VMM_STATE_MEMORY  0x01
#define VMM_STATE_DISK    0x02
#define VMM_STATE_EXTINCT 0x04

#define VMM_ERR_MEM_EXCEEDED 0x30
#define VMM_ERR_INIT         0x31
#define VMM_ERR_SWAP_FILE    0x32

/*
**  VMM_BLOCK_S
**
**  Used for in-memory blocks AND free-blocks in swap file
*/

struct VMM_BLOCK_S
{
   LONG   lDescriptor;
   SHORT   sBytes;
   SHORT   sOwner;
   SHORT   sState;
   LONG    lOffset;  /* offset into swap file */
   PVOID   pvBlock;
   LONG    lTimeLastAccess;
   struct VMM_BLOCK_S * pstMate;
};
 
typedef struct VMM_BLOCK_S VMM_BLOCK_T;
typedef VMM_BLOCK_T * VMM_BLOCK_P;


#define VMM_FILE_NAME_LEN 64

struct VMM_MGR_S
{
   PVOID   pvBlock;             /* main memory block */
   LONG    lTotalBytes;         /* size of main memory block */
   LLIST_P pstMemList;          /* list of sub-allocated memory blocks */
   LLIST_P pstFreeDiskBlocks;   /* list of disk swap blocks */
   LONG    lSwapBytes;          /* largest offset of swap block */
   LONG    lDescriptor;         /* descriptor seed, incremented */
   CHAR    szSwapFile[VMM_FILE_NAME_LEN + 1];
   FILE   *fpSwapFile;
   VMM_BLOCK_P pstReloadBlock;  /* to id swap from disk to memory block */
};
 
typedef struct VMM_MGR_S VMM_MGR_T;
typedef VMM_MGR_T * VMM_MGR_P;
  


#ifdef C_ANSI
SHORT VmmInit(SHORT,PCHAR);
SHORT VmmAlloc(SHORT,SHORT,PLONG);
SHORT VmmPrep(LONG,PPVOID);
SHORT VmmFree(LONG);
SHORT VmmTerm(VOID);
SHORT VmmLoadFromDisk(VMM_BLOCK_P,SHORT);
SHORT VmmAssignBlock(SHORT,SHORT,SHORT,VMM_BLOCK_P *);
SHORT VmmSizeSwapToDisk(SHORT,SHORT,VMM_BLOCK_P *);
SHORT VmmSwapToDisk(VMM_BLOCK_P,SHORT);
SHORT VmmCreateDiskBlock(SHORT,VMM_BLOCK_P *);
SHORT VmmSplitBlock(SHORT,VMM_BLOCK_P,SHORT,SHORT,VMM_BLOCK_P *);
SHORT VmmCreateBlock(SHORT,SHORT,SHORT,PVOID,LONG,VMM_BLOCK_P *);
SHORT VmmCompareBlockSize(PVOID, PVOID);
SHORT VmmCompareHandle(PVOID, PVOID);
SHORT VmmCompress(VOID);
SHORT VmmVanishBlock(SHORT sType,VMM_BLOCK_P pstVanishBlock);
LONG  VmmCurTime(VOID);
#else
SHORT VmmInit();
SHORT VmmAlloc();
SHORT VmmPrep();
SHORT VmmFree();
SHORT VmmTerm();
SHORT VmmLoadFromDisk();
SHORT VmmAssignBlock();
SHORT VmmSizeSwapToDisk();
SHORT VmmSwapToDisk();
SHORT VmmCreateDiskBlock();
SHORT VmmSplitBlock();
SHORT VmmCompress();
SHORT VmmCreateBlock();
SHORT VmmCompareBlockSize();
SHORT VmmCompareHandle();
SHORT VmmVanishBlock();
LONG  VmmCurTime();
#endif


#endif