--- /dev/null
+// NEWMM.C\r
+\r
+/*\r
+=============================================================================\r
+\r
+ ID software memory manager\r
+ --------------------------\r
+\r
+Primary coder: John Carmack\r
+\r
+RELIES ON\r
+---------\r
+Quit (char *error) function\r
+\r
+\r
+WORK TO DO\r
+----------\r
+MM_SizePtr to change the size of a given pointer\r
+\r
+Multiple purge levels utilized\r
+\r
+EMS / XMS unmanaged routines\r
+\r
+=============================================================================\r
+*/\r
+\r
+#include "ID_HEADS.H"\r
+#pragma hdrstop\r
+\r
+#pragma warn -pro\r
+#pragma warn -use\r
+\r
+/*\r
+=============================================================================\r
+\r
+ LOCAL INFO\r
+\r
+=============================================================================\r
+*/\r
+\r
+#define LOCKBIT 0x80 // if set in attributes, block cannot be moved\r
+#define PURGEBITS 3 // 0-3 level, 0= unpurgable, 3= purge first\r
+#define PURGEMASK 0xfffc\r
+#define BASEATTRIBUTES 0 // unlocked, non purgable\r
+\r
+#define MAXUMBS 10\r
+\r
+typedef struct mmblockstruct\r
+{\r
+ unsigned start,length;\r
+ unsigned attributes;\r
+ memptr *useptr; // pointer to the segment start\r
+ struct mmblockstruct far *next;\r
+} mmblocktype;\r
+\r
+\r
+//#define GETNEWBLOCK {if(!(mmnew=mmfree))Quit("MM_GETNEWBLOCK: No free blocks!")\\r
+// ;mmfree=mmfree->next;}\r
+\r
+#define GETNEWBLOCK {if(!mmfree)MML_ClearBlock();mmnew=mmfree;mmfree=mmfree->next;}\r
+\r
+#define FREEBLOCK(x) {*x->useptr=NULL;x->next=mmfree;mmfree=x;}\r
+\r
+/*\r
+=============================================================================\r
+\r
+ GLOBAL VARIABLES\r
+\r
+=============================================================================\r
+*/\r
+\r
+mminfotype mminfo;\r
+memptr bufferseg;\r
+boolean mmerror;\r
+\r
+void (* beforesort) (void);\r
+void (* aftersort) (void);\r
+\r
+/*\r
+=============================================================================\r
+\r
+ LOCAL VARIABLES\r
+\r
+=============================================================================\r
+*/\r
+\r
+boolean mmstarted;\r
+\r
+void far *farheap;\r
+void *nearheap;\r
+\r
+mmblocktype far mmblocks[MAXBLOCKS]\r
+ ,far *mmhead,far *mmfree,far *mmrover,far *mmnew;\r
+\r
+boolean bombonerror;\r
+\r
+//unsigned totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;\r
+\r
+void (* XMSaddr) (void); // far pointer to XMS driver\r
+\r
+unsigned numUMBs,UMBbase[MAXUMBS];\r
+\r
+//==========================================================================\r
+\r
+//\r
+// local prototypes\r
+//\r
+\r
+boolean MML_CheckForEMS (void);\r
+void MML_ShutdownEMS (void);\r
+void MM_MapEMS (void);\r
+boolean MML_CheckForXMS (void);\r
+void MML_ShutdownXMS (void);\r
+void MML_UseSpace (unsigned segstart, unsigned seglength);\r
+void MML_ClearBlock (void);\r
+\r
+//==========================================================================\r
+\r
+/*\r
+======================\r
+=\r
+= MML_CheckForXMS\r
+=\r
+= Check for XMM driver\r
+=\r
+=======================\r
+*/\r
+\r
+boolean MML_CheckForXMS (void)\r
+{\r
+ numUMBs = 0;\r
+\r
+asm {\r
+ mov ax,0x4300\r
+ int 0x2f // query status of installed diver\r
+ cmp al,0x80\r
+ je good\r
+ }\r
+\r
+ return false;\r
+good:\r
+ return true;\r
+}\r
+\r
+\r
+/*\r
+======================\r
+=\r
+= MML_SetupXMS\r
+=\r
+= Try to allocate all upper memory block\r
+=\r
+=======================\r
+*/\r
+\r
+void MML_SetupXMS (void)\r
+{\r
+ unsigned base,size;\r
+\r
+asm {\r
+ mov ax,0x4310\r
+ int 0x2f\r
+ mov [WORD PTR XMSaddr],bx\r
+ mov [WORD PTR XMSaddr+2],es // function pointer to XMS driver\r
+ }\r
+\r
+getmemory:\r
+asm {\r
+ mov ah,XMS_ALLOCUMB\r
+ mov dx,0xffff // try for largest block possible\r
+ call [DWORD PTR XMSaddr]\r
+ or ax,ax\r
+ jnz gotone\r
+\r
+ cmp bl,0xb0 // error: smaller UMB is available\r
+ jne done;\r
+\r
+ mov ah,XMS_ALLOCUMB\r
+ call [DWORD PTR XMSaddr] // DX holds largest available UMB\r
+ or ax,ax\r
+ jz done // another error...\r
+ }\r
+\r
+gotone:\r
+asm {\r
+ mov [base],bx\r
+ mov [size],dx\r
+ }\r
+ MML_UseSpace (base,size);\r
+ mminfo.XMSmem += size*16;\r
+ UMBbase[numUMBs] = base;\r
+ numUMBs++;\r
+ if (numUMBs < MAXUMBS)\r
+ goto getmemory;\r
+\r
+done:;\r
+}\r
+\r
+\r
+/*\r
+======================\r
+=\r
+= MML_ShutdownXMS\r
+=\r
+======================\r
+*/\r
+\r
+void MML_ShutdownXMS (void)\r
+{\r
+ int i;\r
+ unsigned base;\r
+\r
+ for (i=0;i<numUMBs;i++)\r
+ {\r
+ base = UMBbase[i];\r
+\r
+asm mov ah,XMS_FREEUMB\r
+asm mov dx,[base]\r
+asm call [DWORD PTR XMSaddr]\r
+ }\r
+}\r
+\r
+//==========================================================================\r
+\r
+/*\r
+======================\r
+=\r
+= MML_UseSpace\r
+=\r
+= Marks a range of paragraphs as usable by the memory manager\r
+= This is used to mark space for the near heap, far heap, ems page frame,\r
+= and upper memory blocks\r
+=\r
+======================\r
+*/\r
+\r
+void MML_UseSpace (unsigned segstart, unsigned seglength)\r
+{\r
+ mmblocktype far *scan,far *last;\r
+ unsigned oldend;\r
+ long extra;\r
+\r
+ scan = last = mmhead;\r
+ mmrover = mmhead; // reset rover to start of memory\r
+\r
+//\r
+// search for the block that contains the range of segments\r
+//\r
+ while (scan->start+scan->length < segstart)\r
+ {\r
+ last = scan;\r
+ scan = scan->next;\r
+ }\r
+\r
+//\r
+// take the given range out of the block\r
+//\r
+ oldend = scan->start + scan->length;\r
+ extra = oldend - (segstart+seglength);\r
+ if (extra < 0)\r
+ Quit ("MML_UseSpace: Segment spans two blocks!");\r
+\r
+ if (segstart == scan->start)\r
+ {\r
+ last->next = scan->next; // unlink block\r
+ FREEBLOCK(scan);\r
+ scan = last;\r
+ }\r
+ else\r
+ scan->length = segstart-scan->start; // shorten block\r
+\r
+ if (extra > 0)\r
+ {\r
+ GETNEWBLOCK;\r
+ mmnew->useptr = NULL;\r
+\r
+ mmnew->next = scan->next;\r
+ scan->next = mmnew;\r
+ mmnew->start = segstart+seglength;\r
+ mmnew->length = extra;\r
+ mmnew->attributes = LOCKBIT;\r
+ }\r
+\r
+}\r
+\r
+//==========================================================================\r
+\r
+/*\r
+====================\r
+=\r
+= MML_ClearBlock\r
+=\r
+= We are out of blocks, so free a purgable block\r
+=\r
+====================\r
+*/\r
+\r
+void MML_ClearBlock (void)\r
+{\r
+ mmblocktype far *scan,far *last;\r
+\r
+ scan = mmhead->next;\r
+\r
+ while (scan)\r
+ {\r
+ if (!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS) )\r
+ {\r
+ MM_FreePtr(scan->useptr);\r
+ return;\r
+ }\r
+ scan = scan->next;\r
+ }\r
+\r
+ Quit ("MM_ClearBlock: No purgable blocks!");\r
+}\r
+\r
+\r
+//==========================================================================\r
+\r
+/*\r
+===================\r
+=\r
+= MM_Startup\r
+=\r
+= Grabs all space from turbo with malloc/farmalloc\r
+= Allocates bufferseg misc buffer\r
+=\r
+===================\r
+*/\r
+\r
+static char *ParmStrings[] = {"noems","noxms",""};\r
+\r
+void MM_Startup (void)\r
+{\r
+ int i;\r
+ unsigned long length;\r
+ void far *start;\r
+ unsigned segstart,seglength,endfree;\r
+\r
+ if (mmstarted)\r
+ MM_Shutdown ();\r
+\r
+\r
+ mmstarted = true;\r
+ bombonerror = true;\r
+//\r
+// set up the linked list (everything in the free list;\r
+//\r
+ mmhead = NULL;\r
+ mmfree = &mmblocks[0];\r
+ for (i=0;i<MAXBLOCKS-1;i++)\r
+ mmblocks[i].next = &mmblocks[i+1];\r
+ mmblocks[i].next = NULL;\r
+\r
+//\r
+// locked block of all memory until we punch out free space\r
+//\r
+ GETNEWBLOCK;\r
+ mmhead = mmnew; // this will allways be the first node\r
+ mmnew->start = 0;\r
+ mmnew->length = 0xffff;\r
+ mmnew->attributes = LOCKBIT;\r
+ mmnew->next = NULL;\r
+ mmrover = mmhead;\r
+\r
+\r
+//\r
+// get all available near conventional memory segments\r
+//\r
+ length=coreleft();\r
+ start = (void far *)(nearheap = malloc(length));\r
+\r
+ length -= 16-(FP_OFF(start)&15);\r
+ length -= SAVENEARHEAP;\r
+ seglength = length / 16; // now in paragraphs\r
+ segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;\r
+ MML_UseSpace (segstart,seglength);\r
+ mminfo.nearheap = length;\r
+\r
+//\r
+// get all available far conventional memory segments\r
+//\r
+ length=farcoreleft();\r
+ start = farheap = farmalloc(length);\r
+ length -= 16-(FP_OFF(start)&15);\r
+ length -= SAVEFARHEAP;\r
+ seglength = length / 16; // now in paragraphs\r
+ segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;\r
+ MML_UseSpace (segstart,seglength);\r
+ mminfo.farheap = length;\r
+ mminfo.mainmem = mminfo.nearheap + mminfo.farheap;\r
+\r
+//\r
+// allocate the misc buffer\r
+//\r
+ mmrover = mmhead; // start looking for space after low block\r
+\r
+ MM_GetPtr (&bufferseg,BUFFERSIZE);\r
+}\r
+\r
+//==========================================================================\r
+\r
+/*\r
+====================\r
+=\r
+= MM_Shutdown\r
+=\r
+= Frees all conventional, EMS, and XMS allocated\r
+=\r
+====================\r
+*/\r
+\r
+void MM_Shutdown (void)\r
+{\r
+ if (!mmstarted)\r
+ return;\r
+\r
+ farfree (farheap);\r
+ free (nearheap);\r
+// MML_ShutdownXMS ();\r
+}\r
+\r
+//==========================================================================\r
+\r
+/*\r
+====================\r
+=\r
+= MM_GetPtr\r
+=\r
+= Allocates an unlocked, unpurgable block\r
+=\r
+====================\r
+*/\r
+\r
+void MM_GetPtr (memptr *baseptr,unsigned long size)\r
+{\r
+ mmblocktype far *scan,far *lastscan,far *endscan\r
+ ,far *purge,far *next;\r
+ int search;\r
+ unsigned needed,startseg;\r
+\r
+ needed = (size+15)/16; // convert size from bytes to paragraphs\r
+\r
+ GETNEWBLOCK; // fill in start and next after a spot is found\r
+ mmnew->length = needed;\r
+ mmnew->useptr = baseptr;\r
+ mmnew->attributes = BASEATTRIBUTES;\r
+\r
+tryagain:\r
+ for (search = 0; search<3; search++)\r
+ {\r
+ //\r
+ // first search: try to allocate right after the rover, then on up\r
+ // second search: search from the head pointer up to the rover\r
+ // third search: compress memory, then scan from start\r
+ if (search == 1 && mmrover == mmhead)\r
+ search++;\r
+\r
+ switch (search)\r
+ {\r
+ case 0:\r
+ lastscan = mmrover;\r
+ scan = mmrover->next;\r
+ endscan = NULL;\r
+ break;\r
+ case 1:\r
+ lastscan = mmhead;\r
+ scan = mmhead->next;\r
+ endscan = mmrover;\r
+ break;\r
+ case 2:\r
+ MM_SortMem ();\r
+ lastscan = mmhead;\r
+ scan = mmhead->next;\r
+ endscan = NULL;\r
+ break;\r
+ }\r
+\r
+ startseg = lastscan->start + lastscan->length;\r
+\r
+ while (scan != endscan)\r
+ {\r
+ if (scan->start - startseg >= needed)\r
+ {\r
+ //\r
+ // got enough space between the end of lastscan and\r
+ // the start of scan, so throw out anything in the middle\r
+ // and allocate the new block\r
+ //\r
+ purge = lastscan->next;\r
+ lastscan->next = mmnew;\r
+ mmnew->start = *(unsigned *)baseptr = startseg;\r
+ mmnew->next = scan;\r
+ while ( purge != scan)\r
+ { // free the purgable block\r
+ next = purge->next;\r
+ FREEBLOCK(purge);\r
+ purge = next; // purge another if not at scan\r
+ }\r
+ mmrover = mmnew;\r
+ return; // good allocation!\r
+ }\r
+\r
+ //\r
+ // if this block is purge level zero or locked, skip past it\r
+ //\r
+ if ( (scan->attributes & LOCKBIT)\r
+ || !(scan->attributes & PURGEBITS) )\r
+ {\r
+ lastscan = scan;\r
+ startseg = lastscan->start + lastscan->length;\r
+ }\r
+\r
+\r
+ scan=scan->next; // look at next line\r
+ }\r
+ }\r
+\r
+ if (bombonerror)\r
+ {\r
+\r
+extern char configname[];\r
+extern boolean insetupscaling;\r
+extern int viewsize;\r
+boolean SetViewSize (unsigned width, unsigned height);\r
+#define HEIGHTRATIO 0.50\r
+//\r
+// wolf hack -- size the view down\r
+//\r
+ if (!insetupscaling && viewsize>10)\r
+ {\r
+mmblocktype far *savedmmnew;\r
+ savedmmnew = mmnew;\r
+ viewsize -= 2;\r
+ SetViewSize (viewsize*16,viewsize*16*HEIGHTRATIO);\r
+ mmnew = savedmmnew;\r
+ goto tryagain;\r
+ }\r
+\r
+// unlink(configname);\r
+ Quit ("MM_GetPtr: Out of memory!");\r
+ }\r
+ else\r
+ mmerror = true;\r
+}\r
+\r
+//==========================================================================\r
+\r
+/*\r
+====================\r
+=\r
+= MM_FreePtr\r
+=\r
+= Deallocates an unlocked, purgable block\r
+=\r
+====================\r
+*/\r
+\r
+void MM_FreePtr (memptr *baseptr)\r
+{\r
+ mmblocktype far *scan,far *last;\r
+\r
+ last = mmhead;\r
+ scan = last->next;\r
+\r
+ if (baseptr == mmrover->useptr) // removed the last allocated block\r
+ mmrover = mmhead;\r
+\r
+ while (scan->useptr != baseptr && scan)\r
+ {\r
+ last = scan;\r
+ scan = scan->next;\r
+ }\r
+\r
+ if (!scan)\r
+ Quit ("MM_FreePtr: Block not found!");\r
+\r
+ last->next = scan->next;\r
+\r
+ FREEBLOCK(scan);\r
+}\r
+//==========================================================================\r
+\r
+/*\r
+=====================\r
+=\r
+= MM_SetPurge\r
+=\r
+= Sets the purge level for a block (locked blocks cannot be made purgable)\r
+=\r
+=====================\r
+*/\r
+\r
+void MM_SetPurge (memptr *baseptr, int purge)\r
+{\r
+ mmblocktype far *start;\r
+\r
+ start = mmrover;\r
+\r
+ do\r
+ {\r
+ if (mmrover->useptr == baseptr)\r
+ break;\r
+\r
+ mmrover = mmrover->next;\r
+\r
+ if (!mmrover)\r
+ mmrover = mmhead;\r
+ else if (mmrover == start)\r
+ Quit ("MM_SetPurge: Block not found!");\r
+\r
+ } while (1);\r
+\r
+ mmrover->attributes &= ~PURGEBITS;\r
+ mmrover->attributes |= purge;\r
+}\r
+\r
+//==========================================================================\r
+\r
+/*\r
+=====================\r
+=\r
+= MM_SetLock\r
+=\r
+= Locks / unlocks the block\r
+=\r
+=====================\r
+*/\r
+\r
+void MM_SetLock (memptr *baseptr, boolean locked)\r
+{\r
+ mmblocktype far *start;\r
+\r
+ start = mmrover;\r
+\r
+ do\r
+ {\r
+ if (mmrover->useptr == baseptr)\r
+ break;\r
+\r
+ mmrover = mmrover->next;\r
+\r
+ if (!mmrover)\r
+ mmrover = mmhead;\r
+ else if (mmrover == start)\r
+ Quit ("MM_SetLock: Block not found!");\r
+\r
+ } while (1);\r
+\r
+ mmrover->attributes &= ~LOCKBIT;\r
+ mmrover->attributes |= locked*LOCKBIT;\r
+}\r
+\r
+//==========================================================================\r
+\r
+/*\r
+=====================\r
+=\r
+= MM_SortMem\r
+=\r
+= Throws out all purgable stuff and compresses movable blocks\r
+=\r
+=====================\r
+*/\r
+\r
+void MM_SortMem (void)\r
+{\r
+ mmblocktype far *scan,far *last,far *next;\r
+ unsigned start,length,source,dest;\r
+ int playing;\r
+\r
+ //\r
+ // lock down a currently playing sound\r
+ //\r
+ playing = SD_SoundPlaying ();\r
+ if (playing)\r
+ {\r
+ switch (SoundMode)\r
+ {\r
+ case sdm_PC:\r
+ playing += STARTPCSOUNDS;\r
+ break;\r
+ case sdm_AdLib:\r
+ playing += STARTADLIBSOUNDS;\r
+ break;\r
+ }\r
+ MM_SetLock(&(memptr)audiosegs[playing],true);\r
+ }\r
+\r
+\r
+ SD_StopSound();\r
+\r
+ if (beforesort)\r
+ beforesort();\r
+\r
+ scan = mmhead;\r
+\r
+ last = NULL; // shut up compiler warning\r
+\r
+ while (scan)\r
+ {\r
+ if (scan->attributes & LOCKBIT)\r
+ {\r
+ //\r
+ // block is locked, so try to pile later blocks right after it\r
+ //\r
+ start = scan->start + scan->length;\r
+ }\r
+ else\r
+ {\r
+ if (scan->attributes & PURGEBITS)\r
+ {\r
+ //\r
+ // throw out the purgable block\r
+ //\r
+ next = scan->next;\r
+ FREEBLOCK(scan);\r
+ last->next = next;\r
+ scan = next;\r
+ continue;\r
+ }\r
+ else\r
+ {\r
+ //\r
+ // push the non purgable block on top of the last moved block\r
+ //\r
+ if (scan->start != start)\r
+ {\r
+ length = scan->length;\r
+ source = scan->start;\r
+ dest = start;\r
+ while (length > 0xf00)\r
+ {\r
+ movedata(source,0,dest,0,0xf00*16);\r
+ length -= 0xf00;\r
+ source += 0xf00;\r
+ dest += 0xf00;\r
+ }\r
+ movedata(source,0,dest,0,length*16);\r
+\r
+ scan->start = start;\r
+ *(unsigned *)scan->useptr = start;\r
+ }\r
+ start = scan->start + scan->length;\r
+ }\r
+ }\r
+\r
+ last = scan;\r
+ scan = scan->next; // go to next block\r
+ }\r
+\r
+ mmrover = mmhead;\r
+\r
+ if (aftersort)\r
+ aftersort();\r
+\r
+ if (playing)\r
+ MM_SetLock(&(memptr)audiosegs[playing],false);\r
+}\r
+\r
+\r
+//==========================================================================\r
+\r
+/*\r
+=====================\r
+=\r
+= MM_ShowMemory\r
+=\r
+=====================\r
+*/\r
+\r
+void MM_ShowMemory (void)\r
+{\r
+ mmblocktype far *scan;\r
+ unsigned color,temp,x,y;\r
+ long end,owner;\r
+ char scratch[80],str[10];\r
+\r
+ temp = bufferofs;\r
+ bufferofs = displayofs;\r
+ scan = mmhead;\r
+\r
+ end = -1;\r
+\r
+ while (scan)\r
+ {\r
+ if (scan->attributes & PURGEBITS)\r
+ color = 5; // dark purple = purgable\r
+ else\r
+ color = 9; // medium blue = non purgable\r
+ if (scan->attributes & LOCKBIT)\r
+ color = 12; // red = locked\r
+ if (scan->start<=end)\r
+ Quit ("MM_ShowMemory: Memory block order currupted!");\r
+ end = scan->length-1;\r
+ y = scan->start/320;\r
+ x = scan->start%320;\r
+ VW_Hlin(x,x+end,y,color);\r
+ VW_Plot(x,y,15);\r
+ if (scan->next && scan->next->start > end+1)\r
+ VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free\r
+\r
+ scan = scan->next;\r
+ }\r
+\r
+ VW_FadeIn ();\r
+ IN_Ack();\r
+\r
+ bufferofs = temp;\r
+}\r
+\r
+//==========================================================================\r
+\r
+/*\r
+=====================\r
+=\r
+= MM_DumpData\r
+=\r
+=====================\r
+*/\r
+\r
+void MM_DumpData (void)\r
+{\r
+ mmblocktype far *scan,far *best;\r
+ long lowest,oldlowest;\r
+ unsigned owner;\r
+ char lock,purge;\r
+ FILE *dumpfile;\r
+\r
+\r
+ free (nearheap);\r
+ dumpfile = fopen ("MMDUMP.TXT","w");\r
+ if (!dumpfile)\r
+ Quit ("MM_DumpData: Couldn't open MMDUMP.TXT!");\r
+\r
+ lowest = -1;\r
+ do\r
+ {\r
+ oldlowest = lowest;\r
+ lowest = 0xffff;\r
+\r
+ scan = mmhead;\r
+ while (scan)\r
+ {\r
+ owner = (unsigned)scan->useptr;\r
+\r
+ if (owner && owner<lowest && owner > oldlowest)\r
+ {\r
+ best = scan;\r
+ lowest = owner;\r
+ }\r
+\r
+ scan = scan->next;\r
+ }\r
+\r
+ if (lowest != 0xffff)\r
+ {\r
+ if (best->attributes & PURGEBITS)\r
+ purge = 'P';\r
+ else\r
+ purge = '-';\r
+ if (best->attributes & LOCKBIT)\r
+ lock = 'L';\r
+ else\r
+ lock = '-';\r
+ fprintf (dumpfile,"0x%p (%c%c) = %u\n"\r
+ ,(unsigned)lowest,lock,purge,best->length);\r
+ }\r
+\r
+ } while (lowest != 0xffff);\r
+\r
+ fclose (dumpfile);\r
+ Quit ("MMDUMP.TXT created.");\r
+}\r
+\r
+//==========================================================================\r
+\r
+\r
+/*\r
+======================\r
+=\r
+= MM_UnusedMemory\r
+=\r
+= Returns the total free space without purging\r
+=\r
+======================\r
+*/\r
+\r
+long MM_UnusedMemory (void)\r
+{\r
+ unsigned free;\r
+ mmblocktype far *scan;\r
+\r
+ free = 0;\r
+ scan = mmhead;\r
+\r
+ while (scan->next)\r
+ {\r
+ free += scan->next->start - (scan->start + scan->length);\r
+ scan = scan->next;\r
+ }\r
+\r
+ return free*16l;\r
+}\r
+\r
+//==========================================================================\r
+\r
+\r
+/*\r
+======================\r
+=\r
+= MM_TotalFree\r
+=\r
+= Returns the total free space with purging\r
+=\r
+======================\r
+*/\r
+\r
+long MM_TotalFree (void)\r
+{\r
+ unsigned free;\r
+ mmblocktype far *scan;\r
+\r
+ free = 0;\r
+ scan = mmhead;\r
+\r
+ while (scan->next)\r
+ {\r
+ if ((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))\r
+ free += scan->length;\r
+ free += scan->next->start - (scan->start + scan->length);\r
+ scan = scan->next;\r
+ }\r
+\r
+ return free*16l;\r
+}\r
+\r
+//==========================================================================\r
+\r
+/*\r
+=====================\r
+=\r
+= MM_BombOnError\r
+=\r
+=====================\r
+*/\r
+\r
+void MM_BombOnError (boolean bomb)\r
+{\r
+ bombonerror = bomb;\r
+}\r
+\r
+\r
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