1 /* Catacomb Apocalypse Source Code
2 * Copyright (C) 1993-2014 Flat Rock Software
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 =============================================================================
24 ID software memory manager
25 --------------------------
27 Primary coder: John Carmack
31 Quit (char *error) function
36 MM_SizePtr to change the size of a given pointer
38 Multiple purge levels utilized
40 EMS / XMS unmanaged routines
42 =============================================================================
46 Open Watcom port by sparky4
49 #include "src/lib/16_mm.h"
56 =============================================================================
60 =============================================================================
63 void (* beforesort) (void);
64 void (* aftersort) (void);
65 void (* XMSaddr) (void); // far pointer to XMS driver
68 =============================================================================
72 =============================================================================
75 static char *ParmStringsexmm[] = {"noems","noxms",""};
78 ======================
82 = Routine from p36 of Extending DOS
84 =======================
87 boolean MML_CheckForEMS(void)
90 static char emmname[] = "EMMXXXX0"; //fix by andrius4669
91 // mov dx,OFFSET emmname
93 //LEA DX, emmname //fix by andrius4669
94 mov dx,OFFSET emmname //fix by andrius4669
96 int 0x21 // try to open EMMXXXX0 device
102 int 0x21 // get device info
110 int 0x21 // get status
116 int 0x21 // close handle
135 ======================
139 =======================
142 byte MML_SetupEMS(mminfo_t *mm)
146 boolean errorflag=false;
148 unsigned int EMSVer = 0;
150 unsigned totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
151 totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
156 int EMS_INT // make sure EMS hardware is present
158 //mov [EMS_status],ah
165 mov [EMSVer],ax // set EMSVer
166 cmp al,0x32 // only work on ems 3.2 or greater
170 int EMS_INT // find the page frame address
173 mov [EMSpageframe],bx
176 int EMS_INT // find out how much EMS is there
179 mov [totalEMSpages],dx
180 mov [freeEMSpages],bx
182 jz noEMS // no EMS at all to allocate
186 cmp bx,[freeEMSpages]
188 mov bx,[freeEMSpages]
193 jle getpages // there is only 1,2,3,or 4 pages
194 mov bx,4 // we can't use more than 4 pages
197 mov [EMSpagesmapped],bx
198 mov ah,EMS_ALLOCPAGES // allocate up to 64k of EMS
213 //err = CPURegs.h.ah;
214 strcpy(str,"MM_SetupEMS: EMS error ");
216 MM_EMSerr(&str, err);
220 mm->totalEMSpages=totalEMSpages;
221 mm->freeEMSpages=freeEMSpages;
222 mm->EMSpageframe=EMSpageframe;
223 mm->EMSpagesmapped=EMSpagesmapped;
224 mm->EMShandle=EMShandle;
231 ======================
235 =======================
238 void MML_ShutdownEMS(mminfo_t *mm)
240 boolean errorflag=false;
241 unsigned EMShandle=mm->EMShandle;
255 if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!\n"); //++++ add something
263 = Maps the 64k of EMS used by memory manager into the page frame
264 = for general use. This only needs to be called if you are keeping
265 = other things in EMS.
270 byte MM_MapEMS(mminfo_t *mm, mminfotype *mmi)
275 boolean errorflag=false;
277 EMShandle=mm->EMShandle;
279 for (i=0;i<4/*MAPPAGES*/;i++)
284 mov bx,[i] // logical page
285 mov al,bl // physical page
286 mov dx,[EMShandle] // handle
298 //err = CPURegs.h.ah;
299 strcpy(str,"MM_MapEMS: EMS error ");
303 //printf("FACK! %x\n", err);
307 mmi->EMSmem = (i)*0x4000lu;
311 byte MM_MapXEMS(mminfo_t *mm, mminfotype *mmi)
313 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
315 //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
316 //PhysicalStart = Physical page first logical page is mapped to
317 //LogicalStart = First logical page to map
318 //NumPages = Number of pages to map (1 to 4)
319 //Handle = EMS handle logical pages are allocated to
321 /*//Create a buffer containing the page information
322 // FOR x = 0 TO NumPages - 1
323 // MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
326 // Regs.ax = 0x5000 //Map the pages in the buffer
327 // Regs.cx = NumPages //to the pageframe
329 // Regs.ds = VARSEG(MapInfo$)
330 // Regs.si = SADD(MapInfo$)
331 // InterruptX 0x67, Regs, Regs
332 // EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100 //Store the status code
338 boolean errorflag=false;
340 EMShandle=mm->EMShandle;
345 for (i=0;i<MAPPAGES;i++)
350 mov cx,[i] // logical page
351 mov al,bl // physical page
352 mov dx,[EMShandle] // handle
364 //err = CPURegs.h.ah;
365 //strcpy(str,"MM_MapXEMS: EMS error 0x");
366 strcpy(str,"MM_MapXEMS: EMS error ");
368 MM_EMSerr(&str, err);
370 //printf("%s%x\n",str, err);
371 //printf("FACK! %x\n", err);
375 mmi->EMSmem = (i)*0x4000lu;
379 //==========================================================================
382 ======================
386 = Check for XMM driver
388 =======================
391 boolean MML_CheckForXMS(mminfo_t *mm)
393 boolean errorflag=false;
399 int 0x2f // query status of installed diver
405 if(errorflag==true) return false;
411 ======================
415 = Try to allocate all upper memory block
417 =======================
420 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
429 mov [WORD PTR XMSaddr],bx
430 mov [WORD PTR XMSaddr+2],es // function pointer to XMS driver
433 mov dx,0xffff // try for largest block possible
434 //mov ax,dx // Set available Kbytes.
435 call [DWORD PTR XMSaddr]
439 cmp bl,0xb0 // error: smaller UMB is available
443 call [DWORD PTR XMSaddr] // DX holds largest available UMB
445 jz done // another error...
452 printf("base=%u ", base); printf("size=%u\n", size);
453 MML_UseSpace(base,size, mm);
454 mmi->XMSmem += size*16;
455 mm->UMBbase[mm->numUMBs] = base;
457 if(mm->numUMBs < MAXUMBS)
463 ======================
467 ======================
470 void MML_ShutdownXMS(mminfo_t *mm)
475 for (i=0;i<mm->numUMBs;i++)
477 base = mm->UMBbase[i];
482 call [DWORD PTR XMSaddr]
487 //==========================================================================
490 ======================
494 = Marks a range of paragraphs as usable by the memory manager
495 = This is used to mark space for the near heap, far heap, ems page frame,
496 = and upper memory blocks
498 ======================
501 void MML_UseSpace(/*d*/word segstart, dword seglength, mminfo_t *mm)
503 mmblocktype huge *scan,huge *last;
508 scan = last = mm->mmhead;
509 mm->mmrover = mm->mmhead; // reset rover to start of memory
512 // search for the block that contains the range of segments
514 while(scan->start+scan->length < segstart)
520 //find out how many blocks it spans!
521 if(seglength>0xffffu)
523 // segm=seglength/0x4000u;
524 segm=seglength/0xffffu;
529 if(segm>1/*extra>0xfffflu*/)
540 //MML_UseSpace(?segstart?, ?length?, mm);
546 //printf("MML_UseSpace: Segment spans two blocks!\n");
550 // take the given range out of the block
552 oldend = scan->start + scan->length;
553 extra = oldend - (segstart+seglength);
555 printf("segm=%u ", segm);
556 printf("ex=%lu ", extra);
557 printf("start+seglen=%lu ", segstart+seglength);
558 printf("len=%u ", scan->length);
559 printf("segsta=%x ", segstart);
560 printf("seglen=%lu\n", seglength);
563 //++++todo: linked list of segment!
564 //printf("segm=%lu\n", segm);
565 if(segstart == scan->start)
567 last->next = scan->next; // unlink block
568 MM_FreeBlock(scan, mm);
572 scan->length = segstart-scan->start; // shorten block
579 mm->mmnew->next = scan->next;
580 scan->next = mm->mmnew;
581 mm->mmnew->start = segstart+seglength;
582 mm->mmnew->length = extra;
583 mm->mmnew->attributes = LOCKBIT;
584 }//else if(segm>0) goto segu;
588 //==========================================================================
595 = We are out of blocks, so free a purgable block
600 void MML_ClearBlock(mminfo_t *mm)
602 mmblocktype huge *scan,huge *last;
604 scan = mm->mmhead->next;
608 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
610 MM_FreePtr(scan->useptr, mm);
616 printf("MM_ClearBlock: No purgable blocks!\n");
620 //==========================================================================
627 = Grabs all space from turbo with malloc/farmalloc
628 = Allocates bufferseg misc buffer
633 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
636 dword length,seglength;
637 //dword length; word seglength;
639 word segstart;//,endfree;
644 mm->mmstarted = true;
645 mm->bombonerror = true;
648 // set up the linked list (everything in the free list;
650 //printf(" linked list making!\n");
652 mm->mmfree = &(mm->mmblocks[0]);
653 for(i=0;i<MAXBLOCKS-1;i++)
655 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
657 mm->mmblocks[i].next = NULL;
660 // locked block of all memory until we punch out free space
662 //printf(" newblock making!\n");
664 mm->mmhead = mm->mmnew; // this will allways be the first node
665 mm->mmnew->start = 0;
666 mm->mmnew->length = 0xffff;
667 mm->mmnew->attributes = LOCKBIT;
668 mm->mmnew->next = NULL;
669 mm->mmrover = mm->mmhead;
672 // get all available near conventional memory segments
674 //---- length=coreleft();
675 printf(" nearheap making!\n");
677 length=(dword)_memavl();//(dword)GetFreeSize();
678 start = (void huge *)(mm->nearheap = _nmalloc(length));
679 length -= 16-(FP_OFF(start)&15);
680 length -= SAVENEARHEAP;
681 seglength = length / 16; // now in paragraphs
682 segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
683 MML_UseSpace(segstart,seglength, mm);
684 mmi->nearheap = length;
685 printf("start=%FP segstart=%X seglen=%lu len=%lu\n", start, segstart, seglength, length);
690 // get all available far conventional memory segments
692 //---- length=farcoreleft();
693 printf(" farheap making!\n");
695 length=(dword)GetFarFreeSize();//0xffffUL*4UL;
696 //start = mm->farheap = halloc(length, 1);
697 start = mm->farheap = _fmalloc(length);
698 length -= 16-(FP_OFF(start)&15);
699 length -= SAVEFARHEAP;
700 seglength = length / 16; // now in paragraphs
701 segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
702 MML_UseSpace(segstart,seglength, mm);
703 mmi->farheap = length;
704 printf("start=%FP segstart=%X seglen=%lu len=%lu\n", start, segstart, seglength, length);
707 mmi->mainmem = mmi->nearheap + mmi->farheap;
714 // detect EMS and allocate up to 64K at page frame
717 //printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); //bug!
719 for(i = 1;i < __argc;i++)
721 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
722 goto emsskip; // param NOEMS
724 //printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); //bug!
725 if(MML_CheckForEMS())
728 //printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); //bug!
729 MML_SetupEMS(mm); // allocate space
731 //printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); //bug!
732 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
733 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
734 //printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); //bug!
736 //if(mm->EMSVer<0x40)
737 MM_MapEMS(mm, mmi); // map in used pages
739 //MM_MapXEMS(mm, mmi); // map in used pages
746 // detect XMS and get upper memory blocks
750 for(i = 1;i < __argc;i++)
752 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
753 goto xmsskip; // param NOXMS
755 //printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); //bug!
756 if(MML_CheckForXMS(mm))
758 //printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); //bug!
760 MML_SetupXMS(mm, mmi); // allocate as many UMBs as possible
764 // allocate the misc buffer
767 mm->mmrover = mm->mmhead; // start looking for space after low block
769 MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
772 //==========================================================================
779 = Frees all conventional, EMS, and XMS allocated
784 void MM_Shutdown(mminfo_t *mm)
789 _ffree(mm->farheap); printf(" far freed\n");
790 _nfree(mm->nearheap); printf(" near freed\n");
791 if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf(" EMS freed\n"); }
792 if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf(" XMS freed\n"); }
795 //==========================================================================
802 = Allocates an unlocked, unpurgable block
807 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
809 mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
811 unsigned needed,startseg;
813 needed = (size+15)/16; // convert size from bytes to paragraphs
815 MM_GetNewBlock(mm); // fill in start and next after a spot is found
816 mm->mmnew->length = needed;
817 mm->mmnew->useptr = baseptr;
818 mm->mmnew->attributes = BASEATTRIBUTES;
820 for(search = 0; search<3; search++)
823 // first search: try to allocate right after the rover, then on up
824 // second search: search from the head pointer up to the rover
825 // third search: compress memory, then scan from start
826 if(search == 1 && mm->mmrover == mm->mmhead)
832 lastscan = mm->mmrover;
833 scan = mm->mmrover->next;
837 lastscan = mm->mmhead;
838 scan = mm->mmhead->next;
839 endscan = mm->mmrover;
843 lastscan = mm->mmhead;
844 scan = mm->mmhead->next;
849 startseg = lastscan->start + lastscan->length;
851 while(scan != endscan)
853 if(scan->start - startseg >= needed)
856 // got enough space between the end of lastscan and
857 // the start of scan, so throw out anything in the middle
858 // and allocate the new block
860 purge = lastscan->next;
861 lastscan->next = mm->mmnew;
862 mm->mmnew->start = *(unsigned *)baseptr = startseg;
863 mm->mmnew->next = scan;
865 { // free the purgable block
867 MM_FreeBlock(purge, mm);
868 purge = next; // purge another if not at scan
870 mm->mmrover = mm->mmnew;
871 return; // good allocation!
875 // if this block is purge level zero or locked, skip past it
877 if((scan->attributes & LOCKBIT)
878 || !(scan->attributes & PURGEBITS) )
881 startseg = lastscan->start + lastscan->length;
885 scan=scan->next; // look at next line
892 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
893 printf("for stability reasons the program will shut down! wwww\n");
901 //==========================================================================
908 = Allocates an unlocked, unpurgable block
913 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
915 mmblocktype huge *scan,huge *last;
920 if(baseptr == mm->mmrover->useptr) // removed the last allocated block
921 mm->mmrover = mm->mmhead;
923 while(scan->useptr != baseptr && scan)
931 printf("MM_FreePtr: Block not found!\n");
935 last->next = scan->next;
937 MM_FreeBlock(scan, mm);
939 //==========================================================================
942 =====================
946 = Sets the purge level for a block (locked blocks cannot be made purgable)
948 =====================
951 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
953 mmblocktype huge *start;
959 if(mm->mmrover->useptr == baseptr)
962 mm->mmrover = mm->mmrover->next;
965 mm->mmrover = mm->mmhead;
966 else if(mm->mmrover == start)
968 printf("MM_SetPurge: Block not found!");
974 mm->mmrover->attributes &= ~PURGEBITS;
975 mm->mmrover->attributes |= purge;
978 //==========================================================================
981 =====================
985 = Locks / unlocks the block
987 =====================
990 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
992 mmblocktype huge *start;
998 if(mm->mmrover->useptr == baseptr)
1001 mm->mmrover = mm->mmrover->next;
1004 mm->mmrover = mm->mmhead;
1005 else if(mm->mmrover == start)
1007 printf("MM_SetLock: Block not found!");
1013 mm->mmrover->attributes &= ~LOCKBIT;
1014 mm->mmrover->attributes |= locked*LOCKBIT;
1017 //==========================================================================
1020 =====================
1024 = Throws out all purgable stuff and compresses movable blocks
1026 =====================
1029 void MM_SortMem(mminfo_t *mm)
1031 mmblocktype huge *scan,huge *last,huge *next;
1032 unsigned start,length,source,dest,oldborder;
1036 // lock down a currently playing sound
1038 /*++++ playing = SD_SoundPlaying ();
1044 playing += STARTPCSOUNDS;
1047 playing += STARTADLIBSOUNDS;
1050 MM_SetLock(&(memptr)audiosegs[playing],true);
1055 // oldborder = bordercolor;
1056 // VW_ColorBorder (15);
1063 last = NULL; // shut up compiler warning
1067 if(scan->attributes & LOCKBIT)
1070 // block is locked, so try to pile later blocks right after it
1072 start = scan->start + scan->length;
1076 if(scan->attributes & PURGEBITS)
1079 // throw out the purgable block
1082 MM_FreeBlock(scan, mm);
1090 // push the non purgable block on top of the last moved block
1092 if(scan->start != start)
1094 length = scan->length;
1095 source = scan->start;
1097 while(length > 0xf00)
1099 movedata(source,0,dest,0,0xf00*16);
1104 movedata(source,0,dest,0,length*16);
1106 scan->start = start;
1107 *(unsigned *)scan->useptr = start;
1109 start = scan->start + scan->length;
1114 scan = scan->next; // go to next block
1117 mm->mmrover = mm->mmhead;
1122 // VW_ColorBorder (oldborder);
1125 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1129 //==========================================================================
1133 =====================
1137 =====================
1140 void MM_ShowMemory(/*page_t *page, */mminfo_t *mm)
1142 mmblocktype huge *scan;
1146 byte scratch[160],str[16];
1148 //**** VW_SetDefaultColors();
1149 //**** VW_SetLineWidth(40);
1150 //++++mh temp = bufferofs;
1151 //++++mh bufferofs = 0;
1152 //**** VW_SetScreen (0,0);
1165 if(scan->attributes & PURGEBITS)
1166 color = 5; // dark purple = purgable
1168 color = 9; // medium blue = non purgable
1169 if(scan->attributes & LOCKBIT)
1170 color = 12; // red = locked
1171 if(scan->start<=end)
1174 write(debughandle,"\nMM_ShowMemory: Memory block order currupted!\n",strlen("\nMM_ShowMemory: Memory block order currupted!\n"));
1175 //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1178 end = scan->start+scan->length-1;
1179 chy = scan->start/320;
1180 chx = scan->start%320;
1181 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1182 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1184 //++++ modexClearRegion(page, chx, chy, 4, 4, color);
1187 //++++ VW_Hlin(scan->start,(unsigned)end,0,color);
1189 //++++ VW_Plot(scan->start,0,15);
1190 //++++ modexClearRegion(page, chx, chy, 4, 4, 15);
1191 if(scan->next->start > end+1)
1192 //++++ VW_Hlin(end+1,scan->next->start,0,0); // black = free
1193 //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1195 //++++ chx+=scan->next->start;
1196 //++++ modexClearRegion(page, chx, chy, 4, 4, 2);
1198 //modexhlin(page, end+1,scan->next->start, chy, 0);
1201 end = scan->length-1;
1202 y = scan->start/320;
1203 x = scan->start%320;
1204 VW_Hlin(x,x+end,y,color);
1206 if (scan->next && scan->next->start > end+1)
1207 VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1211 printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); //bug!
1212 strcpy(scratch,"Seg:");
1213 ultoa (scan->start,str,16);
1214 strcat (scratch,str);
1215 strcat (scratch,"\tSize:");
1216 ultoa ((dword)scan->length,str,10);
1217 strcat (scratch,str);
1218 strcat (scratch,"\tOwner:0x");
1219 owner = (unsigned)scan->useptr;
1220 ultoa (owner,str,16);
1221 strcat (scratch,str);
1222 strcat (scratch,"\n");
1223 write(debughandle,scratch,strlen(scratch));
1224 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1226 //fprintf(stdout, "%s", scratch);
1235 //**** VW_SetLineWidth(64);
1236 //++++mh bufferofs = temp;
1240 //==========================================================================
1243 =====================
1247 =====================
1250 void MM_DumpData(mminfo_t *mm)
1252 mmblocktype far *scan,far *best;
1253 long lowest,oldlowest;
1259 //++++free(mm->nearheap);
1260 dumpfile = fopen ("mmdump.16","w");
1262 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1275 owner = (word)scan->useptr;
1277 if (owner && owner<lowest && owner > oldlowest)
1286 if (lowest != 0xffff)
1288 if (best->attributes & PURGEBITS)
1292 if (best->attributes & LOCKBIT)
1296 fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1297 ,(word)lowest,lock,purge,best->length);
1300 } while (lowest != 0xffff);
1303 printf("MMDUMP.16 created.\n");
1306 //==========================================================================
1310 ======================
1314 = Returns the total free space without purging
1316 ======================
1319 dword MM_UnusedMemory(mminfo_t *mm)
1322 mmblocktype huge *scan;
1329 free += scan->next->start - (scan->start + scan->length);
1337 //==========================================================================
1341 ======================
1345 = Returns the total free space with purging
1347 ======================
1350 dword MM_TotalFree(mminfo_t *mm)
1353 mmblocktype huge *scan;
1360 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1361 free += scan->length;
1362 free += scan->next->start - (scan->start + scan->length);
1370 //==========================================================================
1373 =====================
1377 =====================
1380 void MM_Report(/*page_t *page, */mminfo_t *mm, mminfotype *mmi)
1382 if(MML_CheckForEMS())
1384 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1385 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1386 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1387 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1389 if(MML_CheckForXMS(mm)) printf("XMSaddr=%X\n", *XMSaddr);
1390 printf("near=%lu\n", mmi->nearheap);
1391 printf("far=%lu\n", mmi->farheap);
1392 printf("EMSmem=%lu\n", mmi->EMSmem);
1393 printf("XMSmem=%lu\n", mmi->XMSmem);
1394 printf("mainmem=%lu\n", mmi->mainmem);
1395 printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1396 printf("TotalFree=%lu\n", MM_TotalFree(mm));
1397 //mmi->nearheap+mmi->farheap+
1398 printf("TotalUsed=%lu\n", mmi->mainmem+mmi->EMSmem+mmi->XMSmem);//+);
1400 // printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1401 // printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1404 //==========================================================================
1407 =====================
1411 =====================
1414 void MM_EMSerr(byte *stri, byte err)
1416 //Returns a text string describing the error code in EMS.Error.
1420 strcat(stri, "successful");
1423 strcat(stri, "internal error");
1426 strcat(stri, "hardware malfunction");
1429 strcat(stri, "busy .. retry later");
1432 strcat(stri, "invalid handle");
1435 strcat(stri, "undefined function requested by application");
1438 strcat(stri, "no more handles available");
1441 strcat(stri, "error in save or restore of mapping context");
1444 strcat(stri, "insufficient memory pages in system");
1447 strcat(stri, "insufficient memory pages available");
1450 strcat(stri, "zero pages requested");
1453 strcat(stri, "invalid logical page number encountered");
1456 strcat(stri, "invalid physical page number encountered");
1459 strcat(stri, "page-mapping hardware state save area is full");
1462 strcat(stri, "save of mapping context failed");
1465 strcat(stri, "restore of mapping context failed");
1468 strcat(stri, "undefined subfunction");
1471 strcat(stri, "undefined attribute type");
1474 strcat(stri, "feature not supported");
1477 strcat(stri, "successful, but a portion of the source region has been overwritten");
1480 strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1483 strcat(stri, "conventional and expanded memory regions overlap");
1486 strcat(stri, "offset within logical page exceeds size of logical page");
1489 strcat(stri, "region length exceeds 1 MB");
1492 strcat(stri, "source and destination EMS regions have same handle and overlap");
1495 strcat(stri, "memory source or destination type undefined");
1498 strcat(stri, "specified alternate map register or DMA register set not supported");
1501 strcat(stri, "all alternate map register or DMA register sets currently allocated");
1504 strcat(stri, "alternate map register or DMA register sets not supported");
1507 strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1510 strcat(stri, "dedicated DMA channels not supported");
1513 strcat(stri, "specified dedicated DMA channel not supported");
1516 strcat(stri, "no such handle name");
1519 strcat(stri, "a handle found had no name, or duplicate handle name");
1522 strcat(stri, "attempted to wrap around 1M conventional address space");
1525 strcat(stri, "source array corrupted");
1528 strcat(stri, "operating system denied access");
1531 strcat(stri, "undefined error");
1535 //==========================================================================
1538 =====================
1542 =====================
1545 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1547 mm->bombonerror = bomb;
1550 void MM_GetNewBlock(mminfo_t *mm)
1554 mm->mmnew=mm->mmfree;
1555 mm->mmfree=mm->mmfree->next;
1556 if(!(mm->mmnew=mm->mmfree))
1558 printf("MM_GETNEWBLOCK: No free blocks!\n");
1561 mm->mmfree=mm->mmfree->next;
1564 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1571 void MM_seguin(void)
1581 void MM_segude(void)
1589 pull data from far and put it into ds var