1 /* Project 16 Source Code~
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2 * Copyright (C) 2012-2016 sparky4 & pngwen & andrius4669 & joncampbell123 & yakui-lover
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4 * This file is part of Project 16.
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6 * Project 16 is free software; you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation; either version 3 of the License, or
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9 * (at your option) any later version.
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11 * Project 16 is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 * GNU General Public License for more details.
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program. If not, see <http://www.gnu.org/licenses/>, or
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18 * write to the Free Software Foundation, Inc., 51 Franklin Street,
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19 * Fifth Floor, Boston, MA 02110-1301 USA.
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25 // Id Engine's Page Manager v1.0
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26 // Primary coder: Jason Blochowiak
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29 #include "src/lib/16_pm.h"
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33 boolean dbg_debugpm=0;
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36 // Main Mem specific variables
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37 //boolean MainPresent;
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38 /* memptr MainMemPages[PMMaxMainMem];
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39 PMBlockAttr gvar->pm.mm.MainMemUsed[PMMaxMainMem];
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40 int gvar->pm.mm.MainPagesAvail;*/
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42 // EMS specific variables
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43 //boolean EMSPresent;
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44 /* word gvar->pm.emm.EMSAvail,gvar->pm.emm.EMSPagesAvail,gvar->pm.emm.EMSHandle,
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45 gvar->pm.emm.EMSPageFrame,gvar->pm.emm.EMSPhysicalPage;
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46 gvar->pm.emm.EMSListStruct gvar->pm.emm.EMSList[EMSFrameCount];*/
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48 // XMS specific variables
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49 //boolean XMSPresent;
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50 //word gvar->pm.xmm.XMSAvail,gvar->pm.xmm.XMSPagesAvail,gvar->pm.xmm.XMSHandle;
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52 /* int gvar->pm.xmm.XMSProtectPage = -1;
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54 // File specific variables
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55 char gvar->pm.fi.PageFileName[13] = {"VSWAP."};
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57 word gvar->pm.fi.ChunksInFile;
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58 word PMSpriteStart,PMSoundStart;*/
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60 // General usage variables
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61 /* boolean PMStarted,
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62 gvar->pm.PMPanicMode,
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63 gvar->pm.PMThrashing;
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64 word gvar->pm.XMSPagesUsed,
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65 gvar->pm.EMSPagesUsed,
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67 gvar->pm.PMNumBlocks;
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69 PageListStruct far *gvar->pm.PMPages,
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70 _seg *gvar->pm.PMSegPages;*/
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72 static char *ParmStrings[] = {"nomain","noems","noxms",nil};
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74 /////////////////////////////////////////////////////////////////////////////
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76 // EMS Management code
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78 /////////////////////////////////////////////////////////////////////////////
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81 // PML_MapEMS() - Maps a logical page to a physical page
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84 PML_MapEMS(word logical, byte physical, global_game_variables_t *gvar)
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90 boolean errorflag=false;
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91 EMShandle=gvar->pm.emm.EMSHandle;
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102 #ifdef __BORLANDC__
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106 #ifdef __BORLANDC__
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111 #ifdef __BORLANDC__
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118 if(errorflag==true)
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120 strcpy(str,"MM_MapEMS: EMS error ");
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121 MM_EMSerr(str, err);
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122 printf("%s\n",str);
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123 Quit("PML_MapEMS: Page mapping failed\n");
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130 // PML_StartupEMS() - Sets up EMS for Page Mgr's use
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131 // Checks to see if EMS driver is present
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132 // Verifies that EMS hardware is present
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133 // Make sure that EMS version is 3.2 or later
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134 // If there's more than our minimum (2 pages) available, allocate it (up
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135 // to the maximum we need)
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139 PML_StartupEMS(global_game_variables_t *gvar)
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145 boolean errorflag=false;
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146 static char emmname[] = "EMMXXXX0"; //fix by andrius4669
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147 unsigned int EMSVer = 0;
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148 unsigned totalEMSpages,freeEMSpages,EMSPageFrame,EMSHandle,EMSAvail;
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149 totalEMSpages = freeEMSpages = EMSPageFrame = 0;
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150 gvar->pm.emm.EMSPresent = false; // Assume that we'll fail
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151 gvar->pm.emm.EMSAvail = 0;
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152 gvar->mmi.EMSmem = 0;
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155 mov dx,OFFSET emmname //fix by andrius4669
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157 int EMS_INT // try to open EMMXXXX0 device
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163 int EMS_INT // get device info
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171 int EMS_INT // get status
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177 int EMS_INT // close handle
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182 jc error1 // make sure EMS hardware is present
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185 int EMS_INT // only work on EMS 3.2 or greater (silly, but...)
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188 mov [EMSVer],ax // set EMSVer
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189 cmp al,0x32 // only work on ems 3.2 or greater
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192 mov ah,EMS_GETFRAME
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193 int EMS_INT // find the page frame address
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196 mov [EMSPageFrame],bx
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198 mov ah,EMS_GETPAGES
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199 int EMS_INT // find out how much EMS is there
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203 jz noEMS // no EMS at all to allocate
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205 jl noEMS // Require at least 2 pages (32k)
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206 mov [totalEMSpages],dx
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207 mov [freeEMSpages],bx
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210 #ifdef __BORLANDC__
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214 #ifdef __BORLANDC__
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220 #ifdef __BORLANDC__
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229 if(errorflag==false)
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231 // Don't hog all available EMS
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232 size = gvar->pm.emm.EMSAvail * (long)EMSPageSize;
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233 if (size - (EMSPageSize * 2) > (gvar->pm.fi.ChunksInFile * (long)PMPageSize))
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235 size = (gvar->pm.fi.ChunksInFile * (long)PMPageSize) + EMSPageSize;
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236 gvar->pm.emm.EMSAvail = size / EMSPageSize;
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241 mov ah,EMS_ALLOCPAGES
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248 #ifdef __BORLANDC__
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252 #ifdef __BORLANDC__
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258 #ifdef __BORLANDC__
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266 if(errorflag==false)
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268 gvar->mmi.EMSmem = EMSAvail * (dword)EMSPageSize;
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270 // Initialize EMS mapping cache
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271 for (i = 0;i < EMSFrameCount;i++)
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272 gvar->pm.emm.EMSList[i].baseEMSPage = -1;
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277 strcpy(str,"PML_StartupEMS: EMS error ");
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278 MM_EMSerr(str, err);
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279 printf("%s\n",str);
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280 return(gvar->pm.emm.EMSPresent);
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283 gvar->pm.emm.EMSPresent = true; // We have EMS
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284 gvar->pm.emm.EMSPageFrame = EMSPageFrame;
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285 gvar->pm.emm.EMSAvail = EMSAvail;
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286 gvar->pm.emm.EMSVer = EMSVer;
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287 gvar->pm.emm.EMSHandle = EMSHandle;
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288 gvar->pm.emm.freeEMSpages = freeEMSpages;
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289 gvar->pm.emm.totalEMSpages = totalEMSpages;
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291 return(gvar->pm.emm.EMSPresent);
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295 // PML_ShutdownEMS() - If EMS was used, deallocate it
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298 PML_ShutdownEMS(global_game_variables_t *gvar)
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303 boolean errorflag=false;
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304 EMSHandle=gvar->pm.emm.EMSHandle;
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306 if (gvar->pm.emm.EMSPresent)
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309 mov ah,EMS_FREEPAGES
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314 #ifdef __BORLANDC__
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318 #ifdef __BORLANDC__
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324 #ifdef __BORLANDC__
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331 if(errorflag==true)
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333 strcpy(str,"PML_ShutdownEMS: Error freeing EMS ");
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334 MM_EMSerr(str, err);
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335 printf("%s\n",str);
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336 Quit("PML_ShutdownEMS: Error freeing EMS\n");
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342 /////////////////////////////////////////////////////////////////////////////
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344 // XMS Management code
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346 /////////////////////////////////////////////////////////////////////////////
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349 // PML_StartupXMS() - Starts up XMS for the Page Mgr's use
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350 // Checks for presence of an XMS driver
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351 // Makes sure that there's at least a page of XMS available
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352 // Allocates any remaining XMS (rounded down to the nearest page size)
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355 PML_StartupXMS(global_game_variables_t *gvar)
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357 //#define STARTUPXMSASM
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360 word XMSAvail, XMSHandle;
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361 #define XMSAVI XMSAvail
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362 #define XMSHAN XMSHandle
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363 //++++ word XMSVer;
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364 boolean errorflag=false;
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366 gvar->pm.xmm.XMSPresent = false; // Assume failure
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367 XMSAVI = gvar->mmi.XMSmem = 0;
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371 int XMS_INT // Check for presence of XMS driver
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377 int XMS_INT // Get address of XMS driver
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378 mov [WORD PTR XMSDriver],bx
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379 mov [WORD PTR XMSDriver+2],es // function pointer to XMS driver
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381 //++++ call [DWORD PTR XMSDriver] //; Get XMS Version Number
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382 //++++ mov [XMSVer],ax
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385 #ifdef STARTUPXMSASM
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386 mov ah,XMS_QUERYFREE // Find out how much XMS is available
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387 call [DWORD PTR XMSDriver]//DWORD PTR
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393 or ax,ax // AJR: bugfix 10/8/92
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398 #ifdef __BORLANDC__
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402 #ifdef __BORLANDC__
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408 #ifdef __BORLANDC__
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415 if(errorflag==true) goto error;
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416 #ifndef STARTUPXMSASM
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417 XMS_CALL(XMS_QUERYFREE); // Find out how much XMS is available
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419 if (!_AX) // AJR: bugfix 10/8/92
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428 #ifdef __DEBUG_PM__
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429 //++++ printf("XMSVer=%02X ", XMSVer);
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430 printf("XMSAvail=%u\n", XMSAVI);
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432 XMSAVI &= ~(PMPageSizeKB - 1); // Round off to nearest page size
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433 if (XMSAVI < (PMPageSizeKB * 2)) // Need at least 2 pages
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438 #ifdef STARTUPXMSASM
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445 mov ah,XMS_ALLOC // And do the allocation
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446 call [DWORD PTR XMSDriver]//DWORD PTR
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452 or ax,ax // AJR: bugfix 10/8/92
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456 #ifdef __BORLANDC__
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460 #ifdef __BORLANDC__
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466 #ifdef __BORLANDC__
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475 XMS_CALL(XMS_ALLOC); // And do the allocation
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477 if (!_AX) // AJR: bugfix 10/8/92
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486 if(errorflag==false)
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488 gvar->mmi.XMSmem = (dword)(XMSAVI) * 1024;
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489 gvar->pm.xmm.XMSAvail = XMSAVI;
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490 gvar->pm.xmm.XMSHandle = XMSHAN;
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491 //++++ gvar->pm.xmm.XMSVer = XMSVer;
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492 gvar->pm.xmm.XMSPresent = true;
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493 #ifdef __DEBUG_PM__
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494 printf(" XMSmem=%lu XMSAvail=%u\n", gvar->mmi.XMSmem, XMSAVI);
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499 #ifdef __DEBUG_PM__
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500 //printf("XMSHandle\n");
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501 //printf(" 1=%u 2=%u 3=%u 4=%u\n", XMSHandle1, XMSHandle2, XMSHandle3, XMSHandle4);
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502 //printf(" 2=%u ", XMSHandle);
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503 //printf(" %u", gvar->pm.xmm.XMSHandle);
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504 printf("err=%02X e=%u\n", err, e);
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507 return(gvar->pm.xmm.XMSPresent);
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511 // PML_XMSCopy() - Copies a main/EMS page to or from XMS
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512 // Will round an odd-length request up to the next even value
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515 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)
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521 word source_handle;
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522 dword source_offset;
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523 word target_handle;
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524 dword target_offset;
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529 Quit("PML_XMSCopy: zero address\n");
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533 xoffset = (dword)xmspage * PMPageSize;
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535 copy.length = (length + 1) & ~1;
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536 copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;
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537 copy.source_offset = toxms? (long)addr : xoffset;
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538 copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;
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539 copy.target_offset = toxms? xoffset : (long)addr;
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545 XMS_CALL(XMS_MOVE);
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551 Quit("PML_XMSCopy: Error on copy");
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557 #define PML_CopyToXMS(s,t,l,gvar) PML_XMSCopy(true,(s),(t),(l),(gvar))
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558 #define PML_CopyFromXMS(t,s,l,gvar) PML_XMSCopy(false,(t),(s),(l),(gvar))
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561 // PML_CopyToXMS() - Copies the specified number of bytes from the real mode
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562 // segment address to the specified XMS page
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565 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)
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567 PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);
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571 // PML_CopyFromXMS() - Copies the specified number of bytes from an XMS
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572 // page to the specified real mode address
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575 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)
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577 PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);
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582 // PML_ShutdownXMS()
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585 PML_ShutdownXMS(global_game_variables_t *gvar)
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587 boolean errorflag=false;
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588 word XMSHandle = gvar->pm.xmm.XMSHandle;
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589 if (gvar->pm.xmm.XMSPresent)
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593 //XMS_CALL(XMS_FREE);
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595 call [DWORD PTR XMSDriver]
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599 #ifdef __BORLANDC__
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603 #ifdef __BORLANDC__
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609 #ifdef __BORLANDC__
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616 if(errorflag==true)
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618 Quit("PML_ShutdownXMS: Error freeing XMS");
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624 /////////////////////////////////////////////////////////////////////////////
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626 // Main memory code
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628 /////////////////////////////////////////////////////////////////////////////
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631 // PM_SetMainMemPurge() - Sets the purge level for all allocated main memory
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632 // blocks. This shouldn't be called directly - the PM_LockMainMem() and
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633 // PM_UnlockMainMem() macros should be used instead.
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636 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)
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640 if(gvar->pm.mm.MainPresent)
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641 for (i = 0;i < PMMaxMainMem;i++)
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643 #ifdef __DEBUG_PM__
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644 printf("PM_SetMainMemPurge() info of gvar->pm.mm.MainMemPages[i]\n");
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645 printf("& %Fp, %Fp\n", &gvar->pm.mm.MainMemPages[i], &(gvar->pm.mm.MainMemPages[i]));
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647 if (gvar->pm.mm.MainMemPages[i])
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648 MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);
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653 Quit("MainPresent IS NULL\n");
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658 // PM_CheckMainMem() - If something besides the Page Mgr makes requests of
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659 // the Memory Mgr, some of the Page Mgr's blocks may have been purged,
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660 // so this function runs through the block list and checks to see if
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661 // any of the blocks have been purged. If so, it marks the corresponding
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662 // page as purged & unlocked, then goes through the block list and
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663 // tries to reallocate any blocks that have been purged.
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664 // This routine now calls PM_LockMainMem() to make sure that any allocation
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665 // attempts made during the block reallocation sweep don't purge any
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666 // of the other blocks. Because PM_LockMainMem() is called,
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667 // PM_UnlockMainMem() needs to be called before any other part of the
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668 // program makes allocation requests of the Memory Mgr.
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671 PM_CheckMainMem(global_game_variables_t *gvar)
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673 boolean allocfailed;
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677 PageListStruct far *page;
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679 if (!gvar->pm.mm.MainPresent)
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682 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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684 n = page->mainPage;
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685 if (n != -1) // Is the page using main memory?
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687 if (!gvar->pm.mm.MainMemPages[n]) // Yep, was the block purged?
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689 page->mainPage = -1; // Yes, mark page as purged & unlocked
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690 page->locked = pml_Unlocked;
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695 // Prevent allocation attempts from purging any of our other blocks
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696 PM_LockMainMem(gvar);
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697 allocfailed = false;
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698 for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)
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700 if (!*p) // If the page got purged
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702 if (*used & pmba_Allocated) // If it was allocated
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704 *used &= ~pmba_Allocated; // Mark as unallocated
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705 gvar->pm.mm.MainPagesAvail--; // and decrease available count
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708 if (*used & pmba_Used) // If it was used
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710 *used &= ~pmba_Used; // Mark as unused
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711 gvar->pm.MainPagesUsed--; // and decrease used count
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716 MM_BombOnError(false, gvar);
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717 MM_GetPtr(p,PMPageSize, gvar); // Try to reallocate
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718 if (gvar->mm.mmerror) // If it failed,
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719 allocfailed = true; // don't try any more allocations
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720 else // If it worked,
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722 *used |= pmba_Allocated; // Mark as allocated
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723 gvar->pm.mm.MainPagesAvail++; // and increase available count
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725 MM_BombOnError(true, gvar);
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729 if (gvar->mm.mmerror)
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730 gvar->mm.mmerror = false;
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734 // PML_StartupMainMem() - Allocates as much main memory as is possible for
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735 // the Page Mgr. The memory is allocated as non-purgeable, so if it's
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736 // necessary to make requests of the Memory Mgr, PM_UnlockMainMem()
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737 // needs to be called.
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740 PML_StartupMainMem(global_game_variables_t *gvar)
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745 gvar->pm.mm.MainPagesAvail = 0;
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746 gvar->pm.mm.MainPresent = false;
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747 MM_BombOnError(false, gvar);
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748 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
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750 MM_GetPtr(p,PMPageSize, gvar);
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751 if (gvar->mm.mmerror)
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754 gvar->pm.mm.MainPagesAvail++;
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755 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;
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757 MM_BombOnError(true, gvar);
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758 if (gvar->mm.mmerror)
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759 gvar->mm.mmerror = false;
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760 if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)
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762 Quit("PM_SetupMainMem: Not enough main memory");
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765 gvar->pm.mm.MainPresent = true;
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769 // PML_ShutdownMainMem() - Frees all of the main memory blocks used by the
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773 PML_ShutdownMainMem(global_game_variables_t *gvar)
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778 // DEBUG - mark pages as unallocated & decrease page count as appropriate
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779 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
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781 MM_FreePtr(p, gvar);
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784 /////////////////////////////////////////////////////////////////////////////
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786 // File management code
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788 /////////////////////////////////////////////////////////////////////////////
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791 // PML_ReadFromFile() - Reads some data in from the page file
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794 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)
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798 Quit("PML_ReadFromFile: Null pointer");
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803 Quit("PML_ReadFromFile: Zero offset");
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806 if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)
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808 Quit("PML_ReadFromFile: Seek failed");
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811 if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))
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813 Quit("PML_ReadFromFile: Read failed");
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819 // PML_OpenPageFile() - Opens the page file and sets up the page info
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822 PML_OpenPageFile(global_game_variables_t *gvar)
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828 dword far *offsetptr;
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829 word far *lengthptr;
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830 PageListStruct far *page;
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832 gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);
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833 if (gvar->pm.fi.PageFile == -1)
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835 Quit("PML_OpenPageFile: Unable to open page file");
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839 // Read in header variables
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840 read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));
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841 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));
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842 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));
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844 // Allocate and clear the page list
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845 gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;
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846 MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);
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847 MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);
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848 gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;
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849 _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);
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851 // Read in the chunk offsets
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852 size = sizeof(dword) * gvar->pm.fi.ChunksInFile;
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853 MM_GetPtr(&buf, size, gvar);
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854 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
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856 Quit("PML_OpenPageFile: Offset read failed");
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859 offsetptr = (dword far *)buf;
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860 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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861 page->offset = *offsetptr++;
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862 MM_FreePtr(&buf, gvar);
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864 // Read in the chunk lengths
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865 size = sizeof(word) * gvar->pm.fi.ChunksInFile;
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866 MM_GetPtr(&buf,size, gvar);
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867 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
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869 Quit("PML_OpenPageFile: Length read failed");
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872 lengthptr = (word far *)buf;
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873 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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874 page->length = *lengthptr++;
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875 MM_FreePtr(&buf, gvar);
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879 // PML_ClosePageFile() - Closes the page file
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882 PML_ClosePageFile(global_game_variables_t *gvar)
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884 if (gvar->pm.fi.PageFile != -1)
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885 close(gvar->pm.fi.PageFile);
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886 if (gvar->pm.PMSegPages)
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888 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);
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889 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);
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893 /////////////////////////////////////////////////////////////////////////////
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895 // Allocation, etc., code
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897 /////////////////////////////////////////////////////////////////////////////
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900 // PML_GetEMSAddress()
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902 // Page is in EMS, so figure out which EMS physical page should be used
\r
903 // to map our page in. If normal page, use EMS physical page 3, else
\r
904 // use the physical page specified by the lock type
\r
906 #ifndef __DEBUG_2__
\r
907 #pragma argsused // DEBUG - remove lock parameter
\r
909 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
\r
912 word emsoff,emsbase,offset;
\r
914 emsoff = page & (PMEMSSubPage - 1);
\r
915 emsbase = page - emsoff;
\r
918 // See if this page is already mapped in
\r
919 for (i = 0;i < EMSFrameCount;i++)
\r
921 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)
\r
923 emspage = i; // Yep - don't do a redundant remapping
\r
928 // If page isn't already mapped in, find LRU EMS frame, and use it
\r
931 dword last = LONG_MAX;
\r
932 for (i = 0;i < EMSFrameCount;i++)
\r
934 if (gvar->pm.emm.EMSList[i].lastHit < last)
\r
937 last = gvar->pm.emm.EMSList[i].lastHit;
\r
941 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;
\r
942 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);
\r
946 Quit("PML_GetEMSAddress: EMS find failed");
\r
948 gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;
\r
949 offset = emspage * EMSPageSizeSeg;
\r
950 offset += emsoff * PMPageSizeSeg;
\r
951 return((memptr)(gvar->pm.emm.EMSPageFrame + offset));
\r
955 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
\r
959 emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);
\r
961 PML_MapEMS(page / PMEMSSubPage,emspage);
\r
963 return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)
\r
964 + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));
\r
969 // PM_GetPageAddress() - Returns the address of a given page
\r
970 // Maps in EMS if necessary
\r
971 // Returns nil if block isn't cached into Main Memory or EMS
\r
975 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)
\r
977 PageListStruct far *page;
\r
979 page = &gvar->pm.PMPages[pagenum];
\r
980 if (page->mainPage != -1)
\r
981 return(gvar->pm.mm.MainMemPages[page->mainPage]);
\r
982 else if (page->emsPage != -1)
\r
983 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));
\r
989 // PML_GiveLRUPage() - Returns the page # of the least recently used
\r
990 // present & unlocked main/EMS page (or main page if mainonly is true)
\r
993 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)
\r
997 PageListStruct far *page;
\r
999 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
1003 (page->lastHit < last)
\r
1004 && ((page->emsPage != -1) || (page->mainPage != -1))
\r
1005 && (page->locked == pml_Unlocked)
\r
1006 && (!(mainonly && (page->mainPage == -1)))
\r
1009 last = page->lastHit;
\r
1015 Quit("PML_GiveLRUPage: LRU Search failed");
\r
1020 // PML_GiveLRUXMSPage() - Returns the page # of the least recently used
\r
1021 // (and present) XMS page.
\r
1022 // This routine won't return the XMS page protected (by XMSProtectPage)
\r
1025 PML_GiveLRUXMSPage(global_game_variables_t *gvar)
\r
1029 PageListStruct far *page;
\r
1031 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
1035 (page->xmsPage != -1)
\r
1036 && (page->lastHit < last)
\r
1037 && (i != gvar->pm.xmm.XMSProtectPage)
\r
1040 last = page->lastHit;
\r
1048 // PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace
\r
1049 // it with the main/EMS page
\r
1052 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)
\r
1055 PageListStruct far *page;
\r
1057 if (!gvar->pm.xmm.XMSPresent)
\r
1060 page = &gvar->pm.PMPages[pagenum];
\r
1061 if (page->xmsPage != -1)
\r
1062 return; // Already in XMS
\r
1064 if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)
\r
1065 page->xmsPage = gvar->pm.XMSPagesUsed++;
\r
1068 usexms = PML_GiveLRUXMSPage(gvar);
\r
1070 Quit("PML_PutPageInXMS: No XMS LRU");
\r
1071 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;
\r
1072 gvar->pm.PMPages[usexms].xmsPage = -1;
\r
1074 PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);
\r
1078 // PML_TransferPageSpace() - A page is being replaced, so give the new page
\r
1079 // the old one's address space. Returns the address of the new page.
\r
1082 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)
\r
1085 PageListStruct far *origpage,far *newpage;
\r
1088 Quit("PML_TransferPageSpace: Identity replacement");
\r
1090 origpage = &gvar->pm.PMPages[orig];
\r
1091 newpage = &gvar->pm.PMPages[new];
\r
1093 if (origpage->locked != pml_Unlocked)
\r
1094 Quit("PML_TransferPageSpace: Killing locked page");
\r
1096 if ((origpage->emsPage == -1) && (origpage->mainPage == -1))
\r
1097 Quit("PML_TransferPageSpace: Reusing non-existent page");
\r
1099 // Copy page that's about to be purged into XMS
\r
1100 PML_PutPageInXMS(orig, gvar);
\r
1102 // Get the address, and force EMS into a physical page if necessary
\r
1103 addr = PM_GetPageAddress(orig, gvar);
\r
1105 // Steal the address
\r
1106 newpage->emsPage = origpage->emsPage;
\r
1107 newpage->mainPage = origpage->mainPage;
\r
1109 // Mark replaced page as purged
\r
1110 origpage->mainPage = origpage->emsPage = -1;
\r
1113 Quit("PML_TransferPageSpace: Zero replacement");
\r
1119 // PML_GetAPageBuffer() - A page buffer is needed. Either get it from the
\r
1120 // main/EMS free pool, or use PML_GiveLRUPage() to find which page to
\r
1121 // steal the buffer from. Returns a far pointer to the page buffer, and
\r
1122 // sets the fields inside the given page structure appropriately.
\r
1123 // If mainonly is true, free EMS will be ignored, and only main pages
\r
1124 // will be looked at by PML_GiveLRUPage().
\r
1127 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1129 byte far *addr = nil;
\r
1131 PMBlockAttr *used;
\r
1132 PageListStruct far *page;
\r
1134 page = &gvar->pm.PMPages[pagenum];
\r
1135 if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)
\r
1137 // There's remaining EMS - use it
\r
1138 page->emsPage = gvar->pm.EMSPagesUsed++;
\r
1139 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);
\r
1141 else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)
\r
1143 // There's remaining main memory - use it
\r
1144 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)
\r
1146 if ((*used & pmba_Allocated) && !(*used & pmba_Used))
\r
1149 *used |= pmba_Used;
\r
1154 Quit("PML_GetPageBuffer: MainPagesAvail lied");
\r
1155 addr = gvar->pm.mm.MainMemPages[n];
\r
1157 Quit("PML_GetPageBuffer: Purged main block");
\r
1158 page->mainPage = n;
\r
1159 gvar->pm.MainPagesUsed++;
\r
1162 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);
\r
1165 Quit("PML_GetPageBuffer: Search failed");
\r
1170 // PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and
\r
1171 // replace it with the page from XMS. If mainonly is true, will only
\r
1172 // search for LRU main page.
\r
1173 // XMSProtectPage is set to the page to be retrieved from XMS, so that if
\r
1174 // the page from which we're stealing the main/EMS from isn't in XMS,
\r
1175 // it won't copy over the page that we're trying to get from XMS.
\r
1176 // (pages that are being purged are copied into XMS, if possible)
\r
1179 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1181 byte far *checkaddr;
\r
1182 memptr addr = nil;
\r
1183 PageListStruct far *page;
\r
1185 page = &gvar->pm.PMPages[pagenum];
\r
1186 if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))
\r
1188 gvar->pm.xmm.XMSProtectPage = pagenum;
\r
1189 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
1190 if (FP_OFF(checkaddr))
\r
1191 Quit("PML_GetPageFromXMS: Non segment pointer");
\r
1192 addr = (memptr)FP_SEG(checkaddr);
\r
1193 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);
\r
1194 gvar->pm.xmm.XMSProtectPage = -1;
\r
1201 // PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.
\r
1202 // Load it into either main or EMS. If mainonly is true, the page will
\r
1203 // only be loaded into main.
\r
1206 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1209 PageListStruct far *page;
\r
1211 addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
1212 page = &gvar->pm.PMPages[pagenum];
\r
1213 PML_ReadFromFile(addr,page->offset,page->length, gvar);
\r
1217 // PM_GetPage() - Returns the address of the page, loading it if necessary
\r
1218 // First, check if in Main Memory or EMS
\r
1219 // Then, check XMS
\r
1220 // If not in XMS, load into Main Memory or EMS
\r
1224 PM_GetPage(int pagenum, global_game_variables_t *gvar)
\r
1228 if (pagenum >= gvar->pm.fi.ChunksInFile)
\r
1229 Quit("PM_GetPage: Invalid page request");
\r
1231 #ifdef __DEBUG_2__ // for debugging
\r
1233 mov dx,STATUS_REGISTER_1
\r
1236 mov al,ATR_OVERSCAN
\r
1238 mov al,10 // bright green
\r
1243 if (!(result = PM_GetPageAddress(pagenum, gvar)))
\r
1245 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);
\r
1246 if (!gvar->pm.PMPages[pagenum].offset) // JDC: sparse page
\r
1247 Quit ("Tried to load a sparse page!");
\r
1248 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))
\r
1250 if (gvar->pm.PMPages[pagenum].lastHit == gvar->pm.PMFrameCount)
\r
1251 gvar->pm.PMThrashing++;
\r
1253 PML_LoadPage(pagenum,mainonly, gvar);
\r
1254 result = PM_GetPageAddress(pagenum, gvar);
\r
1257 gvar->pm.PMPages[pagenum].lastHit = gvar->pm.PMFrameCount;
\r
1259 #ifdef __DEBUG_2__ // for debugging
\r
1261 mov dx,STATUS_REGISTER_1
\r
1264 mov al,ATR_OVERSCAN
\r
1268 mov al,0x20 // normal
\r
1277 // PM_SetPageLock() - Sets the lock type on a given page
\r
1278 // pml_Unlocked: Normal, page can be purged
\r
1279 // pml_Locked: Cannot be purged
\r
1280 // pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page
\r
1281 // specified when returning the address. For sound stuff.
\r
1284 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)
\r
1286 if (pagenum < gvar->pm.fi.PMSoundStart)
\r
1287 Quit("PM_SetPageLock: Locking/unlocking non-sound page");
\r
1289 gvar->pm.PMPages[pagenum].locked = lock;
\r
1293 // PM_Preload() - Loads as many pages as possible into all types of memory.
\r
1294 // Calls the update function after each load, indicating the current
\r
1295 // page, and the total pages that need to be loaded (for thermometer).
\r
1298 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)
\r
1302 word current,total,
\r
1303 totalnonxms,totalxms,
\r
1304 mainfree,maintotal,
\r
1308 PageListStruct far *p;
\r
1310 mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);
\r
1311 xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);
\r
1313 xmstotal = maintotal = 0;
\r
1315 for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)
\r
1317 if (!gvar->pm.PMPages[i].offset)
\r
1318 continue; // sparse
\r
1320 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )
\r
1321 continue; // already in main mem
\r
1328 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )
\r
1336 total = maintotal + xmstotal;
\r
1345 // cache main/ems blocks
\r
1349 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1
\r
1350 || gvar->pm.PMPages[page].emsPage != -1 )
\r
1353 if (page >= gvar->pm.fi.ChunksInFile)
\r
1354 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1356 PM_GetPage(page, gvar);
\r
1361 update(current,total);
\r
1365 // load stuff to XMS
\r
1369 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)
\r
1371 addr = PM_GetPage(oogypage, gvar);
\r
1373 Quit("PM_Preload: XMS buffer failed");
\r
1377 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )
\r
1380 if (page >= gvar->pm.fi.ChunksInFile)
\r
1381 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1383 p = &gvar->pm.PMPages[page];
\r
1385 p->xmsPage = gvar->pm.XMSPagesUsed++;
\r
1386 if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)
\r
1387 Quit("PM_Preload: Exceeded XMS pages");
\r
1388 if (p->length > PMPageSize)
\r
1389 Quit("PM_Preload: Page too long");
\r
1391 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1392 PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);
\r
1397 update(current,total);
\r
1400 p = &gvar->pm.PMPages[oogypage];
\r
1401 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1404 update(total,total);
\r
1407 /////////////////////////////////////////////////////////////////////////////
\r
1411 /////////////////////////////////////////////////////////////////////////////
\r
1414 // PM_NextFrame() - Increments the frame counter and adjusts the thrash
\r
1415 // avoidence variables
\r
1417 // If currently in panic mode (to avoid thrashing), check to see if the
\r
1418 // appropriate number of frames have passed since the last time that
\r
1419 // we would have thrashed. If so, take us out of panic mode.
\r
1423 PM_NextFrame(global_game_variables_t *gvar)
\r
1427 // Frame count overrun - kill the LRU hit entries & reset frame count
\r
1428 if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)
\r
1430 for (i = 0;i < gvar->pm.PMNumBlocks;i++)
\r
1431 gvar->pm.PMPages[i].lastHit = 0;
\r
1432 gvar->pm.PMFrameCount = 0;
\r
1436 for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)
\r
1438 if (gvar->pm.PMPages[i].locked)
\r
1441 sprintf(buf,"PM_NextFrame: Page %d is locked",i);
\r
1447 if (gvar->pm.PMPanicMode)
\r
1449 // DEBUG - set border color
\r
1450 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))
\r
1452 // DEBUG - reset border color
\r
1455 if (gvar->pm.PMThrashing >= PMThrashThreshold)
\r
1456 gvar->pm.PMPanicMode = PMUnThrashThreshold;
\r
1457 gvar->pm.PMThrashing = false;
\r
1461 // PM_Reset() - Sets up caching structures
\r
1464 PM_Reset(global_game_variables_t *gvar)
\r
1467 PageListStruct far *page;
\r
1469 gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;
\r
1471 gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);
\r
1472 gvar->pm.emm.EMSPhysicalPage = 0;
\r
1474 gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;
\r
1476 gvar->pm.PMPanicMode = false;
\r
1478 gvar->pm.fi.PageFile = -1;
\r
1479 gvar->pm.xmm.XMSProtectPage = -1;
\r
1481 // Initialize page list
\r
1482 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)
\r
1484 page->mainPage = -1;
\r
1485 page->emsPage = -1;
\r
1486 page->xmsPage = -1;
\r
1487 page->locked = false;
\r
1492 // PM_Startup() - Start up the Page Mgr
\r
1495 PM_Startup(global_game_variables_t *gvar)
\r
1497 boolean nomain,noems,noxms;
\r
1500 if (gvar->pm.PMStarted)
\r
1503 //strcpy(&(gvar->pm.fi.PageFileName), "VSWAP.");
\r
1505 nomain = noems = noxms = false;
\r
1507 #ifdef __WATCOMC__
\r
1510 #ifdef __BORLANDC__
\r
1515 switch (US_CheckParm(
\r
1516 #ifdef __WATCOMC__
\r
1519 #ifdef __BORLANDC__
\r
1536 //0000+=+=PML_OpenPageFile(gvar);
\r
1538 if (!noems && MML_CheckForEMS())
\r
1539 PML_StartupEMS(gvar);
\r
1540 if (!noxms && MML_CheckForXMS())
\r
1541 PML_StartupXMS(gvar);
\r
1543 PML_StartupMainMem(gvar);
\r
1545 if (!gvar->pm.mm.MainPresent && !gvar->pm.emm.EMSPresent && !gvar->pm.xmm.XMSPresent)
\r
1547 Quit("PM_Startup: No main or EMS\n");
\r
1553 gvar->pm.PMStarted = true;
\r
1557 // PM_Shutdown() - Shut down the Page Mgr
\r
1560 PM_Shutdown(global_game_variables_t *gvar)
\r
1562 if(MML_CheckForXMS()) PML_ShutdownXMS(gvar);
\r
1563 if(MML_CheckForEMS()) PML_ShutdownEMS(gvar);
\r
1565 if (!gvar->pm.PMStarted)
\r
1568 PML_ClosePageFile(gvar);
\r
1570 PML_ShutdownMainMem(gvar);
\r