1 /* Catacomb Armageddon Source Code
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2 * Copyright (C) 1993-2014 Flat Rock Software
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; either version 2 of the License, or
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7 * (at your option) any later version.
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9 * This program is distributed in the hope that it will be useful,
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 * GNU General Public License for more details.
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14 * You should have received a copy of the GNU General Public License along
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15 * with this program; if not, write to the Free Software Foundation, Inc.,
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16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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22 =============================================================================
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24 ID software memory manager
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25 --------------------------
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27 Primary coder: John Carmack
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31 Quit (char *error) function
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36 MM_SizePtr to change the size of a given pointer
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38 Multiple purge levels utilized
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40 EMS / XMS unmanaged routines
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42 =============================================================================
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45 #include "src/lib/16_mm.h"
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48 =============================================================================
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52 =============================================================================
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59 void (* beforesort) (void);
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60 void (* aftersort) (void);
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63 =============================================================================
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67 =============================================================================
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75 mmblocktype far mmblocks[MAXBLOCKS]
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76 ,far *mmhead,far *mmfree,far *mmrover,far *mmnew;
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78 boolean bombonerror;
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80 unsigned totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
81 unsigned int EMSVer;
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83 void (* XMSaddr) (void); // far pointer to XMS driver
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85 unsigned numUMBs,UMBbase[MAXUMBS];
87 static char *ParmStringsexmm[] = {"noems","noxms",""};
90 ======================
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94 = Routine from p36 of Extending DOS
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96 =======================
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99 boolean MML_CheckForEMS (void)
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102 char emmname[] = "EMMXXXX0";
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103 // mov dx,OFFSET emmname
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105 LEA DX, emmname //fix by andrius4669
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107 int 0x21 // try to open EMMXXXX0 device
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113 int 0x21 // get device info
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121 int 0x21 // get status
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127 int 0x21 // close handle
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146 ======================
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150 =======================
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153 unsigned MML_SetupEMS (void)
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155 char str[80],str2[10];
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157 boolean errorflag=false;
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158 union REGS CPURegs;
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161 totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
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166 int EMS_INT // make sure EMS hardware is present
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174 mov [EMSVer],ax // set EMSVer
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175 cmp al,0x32 // only work on ems 3.2 or greater
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178 mov ah,EMS_GETFRAME
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179 int EMS_INT // find the page frame address
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182 mov [EMSpageframe],bx
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184 mov ah,EMS_GETPAGES
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185 int EMS_INT // find out how much EMS is there
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188 mov [totalEMSpages],dx
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189 mov [freeEMSpages],bx
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191 jz noEMS // no EMS at all to allocate
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194 jle getpages // there is only 1,2,3,or 4 pages
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195 mov bx,4 // we can't use more than 4 pages
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198 mov [EMSpagesmapped],bx
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199 mov ah,EMS_ALLOCPAGES // allocate up to 64k of EMS
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211 if(errorflag==true)
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213 err = CPURegs.h.ah;
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214 strcpy(str,"MML_SetupEMS: EMS error 0x");
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225 ======================
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229 =======================
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232 void MML_ShutdownEMS (void)
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234 boolean errorflag=false;
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239 mov ah,EMS_FREEPAGES
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247 if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!"); //++++ add something
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251 ====================
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255 = Maps the 64k of EMS used by memory manager into the page frame
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256 = for general use. This only needs to be called if you are keeping
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257 = other things in EMS.
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259 ====================
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262 unsigned MM_MapEMS (void)
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264 char str[80],str2[10];
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266 boolean errorflag=false;
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268 union REGS CPURegs;
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270 for (i=0;i<EMSpagesmapped;i++)
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275 mov bx,[i] // logical page
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276 mov al,bl // physical page
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277 mov dx,[EMShandle] // handle
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286 if(errorflag==true)
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288 err = CPURegs.h.ah;
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289 strcpy(str,"MM_MapEMS: EMS error 0x");
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299 //==========================================================================
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302 ======================
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306 = Check for XMM driver
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308 =======================
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311 boolean MML_CheckForXMS (void)
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313 boolean errorflag=false;
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319 int 0x2f // query status of installed diver
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325 if(errorflag==true) return false;
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331 ======================
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335 = Try to allocate all upper memory block
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337 =======================
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340 void MML_SetupXMS (void)
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342 unsigned base,size;
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348 mov [WORD PTR XMSaddr],bx
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349 mov [WORD PTR XMSaddr+2],es // function pointer to XMS driver
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354 mov ah,XMS_ALLOCUMB
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355 mov dx,0xffff // try for largest block possible
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356 call [DWORD PTR XMSaddr]
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360 cmp bl,0xb0 // error: smaller UMB is available
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363 mov ah,XMS_ALLOCUMB
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364 call [DWORD PTR XMSaddr] // DX holds largest available UMB
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366 jz done // another error...
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373 MML_UseSpace (base,size);
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374 mminfo.XMSmem += size*16;
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375 UMBbase[numUMBs] = base;
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377 if (numUMBs < MAXUMBS)
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383 ======================
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387 ======================
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390 void MML_ShutdownXMS (void)
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395 for (i=0;i<numUMBs;i++)
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402 call [DWORD PTR XMSaddr]
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407 //==========================================================================
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410 ======================
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414 = Marks a range of paragraphs as usable by the memory manager
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415 = This is used to mark space for the near heap, far heap, ems page frame,
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416 = and upper memory blocks
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418 ======================
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421 void MML_UseSpace (unsigned segstart, unsigned seglength)
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423 mmblocktype far *scan,far *last;
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427 scan = last = mmhead;
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428 mmrover = mmhead; // reset rover to start of memory
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431 // search for the block that contains the range of segments
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433 while (scan->start+scan->length < segstart)
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440 // take the given range out of the block
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442 oldend = scan->start + scan->length;
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443 extra = oldend - (segstart+seglength);
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446 printf("MML_UseSpace: Segment spans two blocks!");
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451 if (segstart == scan->start)
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453 last->next = scan->next; // unlink block
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458 scan->length = segstart-scan->start; // shorten block
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463 mmnew->next = scan->next;
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464 scan->next = mmnew;
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465 mmnew->start = segstart+seglength;
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466 mmnew->length = extra;
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467 mmnew->attributes = LOCKBIT;
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472 //==========================================================================
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475 ====================
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479 = We are out of blocks, so free a purgable block
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481 ====================
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484 void MML_ClearBlock (void)
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486 mmblocktype far *scan,far *last;
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488 scan = mmhead->next;
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492 if (!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS) )
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494 MM_FreePtr(scan->useptr);
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500 printf("MM_ClearBlock: No purgable blocks!");
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504 //==========================================================================
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507 ===================
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511 = Grabs all space from turbo with malloc/farmalloc
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512 = Allocates bufferseg misc buffer
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514 ===================
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517 void MM_Startup (void)
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522 unsigned segstart,seglength,endfree;
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524 if (mminfo.mmstarted)
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528 mminfo.mmstarted = true;
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529 mminfo.bombonerror = true;
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531 // set up the linked list (everything in the free list;
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534 mmfree = &mmblocks[0];
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535 for (i=0;i<MAXBLOCKS-1;i++)
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536 mmblocks[i].next = &mmblocks[i+1];
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537 mmblocks[i].next = NULL;
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540 // locked block of all memory until we punch out free space
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543 mmhead = mmnew; // this will allways be the first node
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545 mmnew->length = 0xffff;
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546 mmnew->attributes = LOCKBIT;
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547 mmnew->next = NULL;
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552 // get all available near conventional memory segments
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554 //---- length=coreleft();
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557 start = (void far *)(nearheap = malloc(length));
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559 length -= 16-(FP_OFF(start)&15);
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560 length -= SAVENEARHEAP;
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561 seglength = length / 16; // now in paragraphs
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562 segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
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563 MML_UseSpace (segstart,seglength);
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564 mminfo.nearheap = length;
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567 // get all available far conventional memory segments
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569 //---- length=farcoreleft();
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572 start = farheap = _fmalloc(length);
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573 length -= 16-(FP_OFF(start)&15);
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574 length -= SAVEFARHEAP;
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575 seglength = length / 16; // now in paragraphs
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576 segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
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577 MML_UseSpace (segstart,seglength);
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578 mminfo.farheap = length;
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579 mminfo.mainmem = mminfo.nearheap + mminfo.farheap;
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583 // detect EMS and allocate up to 64K at page frame
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586 for (i = 1;i < __argc;i++)
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588 if ( US_CheckParm(__argv[i],ParmStringsexmm) == 0)
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589 goto emsskip; // param NOEMS
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592 if (MML_CheckForEMS())
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594 //printf("EMS1\n");
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595 MML_SetupEMS(); // allocate space
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596 //printf("EMS2\n");
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597 MML_UseSpace (EMSpageframe,EMSpagesmapped*0x400);
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598 //printf("EMS3\n");
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599 MM_MapEMS(); // map in used pages
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600 //printf("EMS4\n");
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601 mminfo.EMSmem = EMSpagesmapped*0x4000l;
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605 // detect XMS and get upper memory blocks
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609 for (i = 1;i < __argc;i++)
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611 if ( US_CheckParm(__argv[i],ParmStringsexmm) == 0)
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612 goto xmsskip; // param NOXMS
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615 if (MML_CheckForXMS())
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617 // printf("XMS!\n");
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618 //++++ MML_SetupXMS(); // allocate as many UMBs as possible
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622 // allocate the misc buffer
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625 mmrover = mmhead; // start looking for space after low block
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627 MM_GetPtr (&bufferseg,BUFFERSIZE);
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630 //==========================================================================
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633 ====================
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637 = Frees all conventional, EMS, and XMS allocated
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639 ====================
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642 void MM_Shutdown (void)
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644 if (!mminfo.mmstarted)
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648 printf("far freed\n");
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650 printf("near freed\n");
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652 printf("huge freed\n");
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654 printf("EMS freed\n");
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655 //++++ MML_ShutdownXMS ();
656 printf("XMS freed\n");
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659 //==========================================================================
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662 ====================
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666 = Allocates an unlocked, unpurgable block
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668 ====================
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671 void MM_GetPtr (memptr *baseptr,dword size)
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673 mmblocktype far *scan,far *lastscan,far *endscan
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674 ,far *purge,far *next;
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676 unsigned needed,startseg;
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678 needed = (size+15)/16; // convert size from bytes to paragraphs
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680 GETNEWBLOCK; // fill in start and next after a spot is found
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681 mmnew->length = needed;
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682 mmnew->useptr = baseptr;
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683 mmnew->attributes = BASEATTRIBUTES;
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685 for (search = 0; search<3; search++)
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688 // first search: try to allocate right after the rover, then on up
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689 // second search: search from the head pointer up to the rover
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690 // third search: compress memory, then scan from start
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691 if (search == 1 && mmrover == mmhead)
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697 lastscan = mmrover;
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698 scan = mmrover->next;
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703 scan = mmhead->next;
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709 scan = mmhead->next;
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714 startseg = lastscan->start + lastscan->length;
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716 while (scan != endscan)
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718 if (scan->start - startseg >= needed)
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721 // got enough space between the end of lastscan and
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722 // the start of scan, so throw out anything in the middle
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723 // and allocate the new block
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725 purge = lastscan->next;
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726 lastscan->next = mmnew;
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727 mmnew->start = *(unsigned *)baseptr = startseg;
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728 mmnew->next = scan;
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729 while ( purge != scan)
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730 { // free the purgable block
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731 next = purge->next;
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733 purge = next; // purge another if not at scan
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736 return; // good allocation!
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740 // if this block is purge level zero or locked, skip past it
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742 if ( (scan->attributes & LOCKBIT)
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743 || !(scan->attributes & PURGEBITS) )
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746 startseg = lastscan->start + lastscan->length;
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750 scan=scan->next; // look at next line
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754 if (mminfo.bombonerror)
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755 printf(OUT_OF_MEM_MSG,(size-mminfo.nearheap));
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757 mminfo.mmerror = true;
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760 //==========================================================================
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763 ====================
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767 = Allocates an unlocked, unpurgable block
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769 ====================
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772 void MM_FreePtr (memptr *baseptr)
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774 mmblocktype far *scan,far *last;
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779 if (baseptr == mmrover->useptr) // removed the last allocated block
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782 while (scan->useptr != baseptr && scan)
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790 printf("MM_FreePtr: Block not found!");
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794 last->next = scan->next;
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798 //==========================================================================
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801 =====================
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805 = Sets the purge level for a block (locked blocks cannot be made purgable)
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807 =====================
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810 void MM_SetPurge (memptr *baseptr, int purge)
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812 mmblocktype far *start;
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818 if (mmrover->useptr == baseptr)
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821 mmrover = mmrover->next;
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825 else if (mmrover == start)
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827 printf("MM_SetPurge: Block not found!");
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833 mmrover->attributes &= ~PURGEBITS;
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834 mmrover->attributes |= purge;
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837 //==========================================================================
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840 =====================
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844 = Locks / unlocks the block
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846 =====================
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849 void MM_SetLock (memptr *baseptr, boolean locked)
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851 mmblocktype far *start;
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857 if (mmrover->useptr == baseptr)
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860 mmrover = mmrover->next;
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864 else if (mmrover == start)
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866 printf("MM_SetLock: Block not found!");
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872 mmrover->attributes &= ~LOCKBIT;
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873 mmrover->attributes |= locked*LOCKBIT;
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876 //==========================================================================
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879 =====================
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883 = Throws out all purgable stuff and compresses movable blocks
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885 =====================
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888 void MM_SortMem (void)
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890 mmblocktype far *scan,far *last,far *next;
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891 unsigned start,length,source,dest,oldborder;
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895 // lock down a currently playing sound
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897 /*++++ playing = SD_SoundPlaying ();
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903 playing += STARTPCSOUNDS;
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906 playing += STARTADLIBSOUNDS;
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909 MM_SetLock(&(memptr)audiosegs[playing],true);
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914 // oldborder = bordercolor;
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915 // VW_ColorBorder (15);
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922 last = NULL; // shut up compiler warning
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926 if (scan->attributes & LOCKBIT)
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929 // block is locked, so try to pile later blocks right after it
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931 start = scan->start + scan->length;
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935 if (scan->attributes & PURGEBITS)
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938 // throw out the purgable block
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949 // push the non purgable block on top of the last moved block
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951 if (scan->start != start)
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953 length = scan->length;
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954 source = scan->start;
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956 while (length > 0xf00)
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958 movedata(source,0,dest,0,0xf00*16);
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963 movedata(source,0,dest,0,length*16);
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965 scan->start = start;
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966 *(unsigned *)scan->useptr = start;
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968 start = scan->start + scan->length;
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973 scan = scan->next; // go to next block
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981 // VW_ColorBorder (oldborder);
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983 /*++++ if (playing)
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984 MM_SetLock(&(memptr)audiosegs[playing],false);*/
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988 //==========================================================================
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992 =====================
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996 =====================
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999 void MM_ShowMemory (void)
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1001 mmblocktype far *scan;
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1002 unsigned color,temp;//, i;
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1004 char scratch[80],str[10];
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1006 //**** VW_SetDefaultColors();
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1007 //**** VW_SetLineWidth(40);
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1008 //++++mh temp = bufferofs;
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1009 //++++mh bufferofs = 0;
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1010 //**** VW_SetScreen (0,0);
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1016 //CA_OpenDebug ();
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1020 if (scan->attributes & PURGEBITS)
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1021 color = 5; // dark purple = purgable
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1023 color = 9; // medium blue = non purgable
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1024 if (scan->attributes & LOCKBIT)
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1025 color = 12; // red = locked
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1026 if (scan->start<=end)
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1028 printf("MM_ShowMemory: Memory block order currupted!");
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1031 end = scan->start+scan->length-1;
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1032 //++++ VW_Hlin(scan->start,(unsigned)end,0,color);
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1033 //++++ VW_Plot(scan->start,0,15);
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1034 if (scan->next->start > end+1)
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1035 //++++ VW_Hlin(end+1,scan->next->start,0,0); // black = free
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1038 printf("Location:");
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1039 printf("%Fp\t", scan->start);
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1040 strcpy (scratch,"Size:");
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1041 ltoa ((long)scan->length*16,str,10);
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1042 strcat (scratch,str);
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1043 strcat (scratch,"\tOwner:0x");
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1044 owner = (unsigned)scan->useptr;
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1045 ultoa (owner,str,16);
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1046 strcat (scratch,str);
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1047 strcat (scratch,"\n");
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1048 //++++write (debughandle,scratch,strlen(scratch));
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1049 fprintf(stdout, "%s", scratch);
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1052 scan = scan->next;
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1055 //CA_CloseDebug ();
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1057 //++++mh IN_Ack();
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1058 //**** VW_SetLineWidth(64);
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1059 //++++mh bufferofs = temp;
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1063 //==========================================================================
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1067 ======================
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1071 = Returns the total free space without purging
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1073 ======================
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1076 dword MM_UnusedMemory (void)
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1079 mmblocktype far *scan;
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1084 while (scan->next)
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1086 free += scan->next->start - (scan->start + scan->length);
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1087 scan = scan->next;
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1094 //==========================================================================
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1098 ======================
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1102 = Returns the total free space with purging
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1104 ======================
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1107 dword MM_TotalFree (void)
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1110 mmblocktype far *scan;
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1115 while (scan->next)
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1117 if ((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
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1118 free += scan->length;
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1119 free += scan->next->start - (scan->start + scan->length);
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1120 scan = scan->next;
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1127 //==========================================================================
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1130 =====================
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1134 =====================
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1137 void MM_Report(void)
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1139 printf("EMM %x available\n", EMSVer);
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1140 printf("totalEMSpages=%u\n", totalEMSpages);
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1141 printf("freeEMSpages=%u\n", freeEMSpages);
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1142 printf("EMSpageframe=%Fp\n", EMSpageframe);
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1143 printf("near=%lu\n", mminfo.nearheap);
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1144 printf("far=%lu\n", mminfo.farheap);
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1145 printf("EMSmem=%lu\n", mminfo.EMSmem);
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1146 printf("XMSmem=%lu\n", mminfo.XMSmem);
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1147 printf("mainmem=%lu\n", mminfo.mainmem);
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1148 printf("UnusedMemory=%lu\n", MM_UnusedMemory());
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1149 printf("TotalFree=%lu\n", MM_TotalFree());
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1151 // printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
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1152 // printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
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1155 //==========================================================================
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1158 =====================
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1162 =====================
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1165 int MM_EMSVer(void)
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1170 mov ah,EMS_VERSION
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1177 //==========================================================================
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1180 =====================
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1184 =====================
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1187 void MM_BombOnError (boolean bomb)
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1189 mminfo.bombonerror = bomb;
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