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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51 dword XMSDriver; //hard to put in gvar
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52 word XMSVer; //hard to put in gvar
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53 /* int gvar->pm.xmm.XMSProtectPage = -1;
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55 // File specific variables
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56 char gvar->pm.fi.PageFileName[13] = {"VSWAP."};
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58 word gvar->pm.fi.ChunksInFile;
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59 word PMSpriteStart,PMSoundStart;*/
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61 // General usage variables
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62 /* boolean PMStarted,
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63 gvar->pm.PMPanicMode,
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64 gvar->pm.PMThrashing;
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65 word gvar->pm.XMSPagesUsed,
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66 gvar->pm.EMSPagesUsed,
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68 gvar->pm.PMNumBlocks;
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70 PageListStruct far *gvar->pm.PMPages,
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71 _seg *gvar->pm.PMSegPages;*/
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73 static char *ParmStrings[] = {"nomain","noems","noxms",nil};
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75 /////////////////////////////////////////////////////////////////////////////
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77 // EMS Management code
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79 /////////////////////////////////////////////////////////////////////////////
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82 // PML_MapEMS() - Maps a logical page to a physical page
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85 PML_MapEMS(word logical, byte physical, global_game_variables_t *gvar)
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91 boolean errorflag=false;
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92 EMShandle=gvar->pm.emm.EMSHandle;
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103 #ifdef __BORLANDC__
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107 #ifdef __BORLANDC__
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112 #ifdef __BORLANDC__
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119 if(errorflag==true)
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121 strcpy(str,"MM_MapEMS: EMS error ");
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122 MM_EMSerr(str, err);
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123 printf("%s\n",str);
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124 Quit("PML_MapEMS: Page mapping failed\n");
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131 // PML_StartupEMS() - Sets up EMS for Page Mgr's use
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132 // Checks to see if EMS driver is present
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133 // Verifies that EMS hardware is present
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134 // Make sure that EMS version is 3.2 or later
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135 // If there's more than our minimum (2 pages) available, allocate it (up
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136 // to the maximum we need)
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140 PML_StartupEMS(global_game_variables_t *gvar)
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146 boolean errorflag=false;
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147 static char emmname[] = "EMMXXXX0"; //fix by andrius4669
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148 unsigned int EMSVer = 0;
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149 unsigned totalEMSpages,freeEMSpages,EMSPageFrame,EMSHandle,EMSAvail;
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150 totalEMSpages = freeEMSpages = EMSPageFrame = 0;
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151 gvar->pm.emm.EMSPresent = false; // Assume that we'll fail
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152 gvar->pm.emm.EMSAvail = 0;
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153 gvar->mmi.EMSmem = 0;
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156 mov dx,OFFSET emmname //fix by andrius4669
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158 int EMM_INT // try to open EMMXXXX0 device
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164 int EMM_INT // get device info
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172 int EMM_INT // get status
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178 int EMM_INT // close handle
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183 jc error1 // make sure EMS hardware is present
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186 int EMS_INT // only work on EMS 3.2 or greater (silly, but...)
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189 mov [EMSVer],ax // set EMSVer
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190 cmp al,0x32 // only work on ems 3.2 or greater
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193 mov ah,EMS_GETFRAME
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194 int EMS_INT // find the page frame address
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197 mov [EMSPageFrame],bx
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199 mov ah,EMS_GETPAGES
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200 int EMS_INT // find out how much EMS is there
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204 jz noEMS // no EMS at all to allocate
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206 jl noEMS // Require at least 2 pages (32k)
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207 mov [totalEMSpages],dx
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208 mov [freeEMSpages],bx
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211 #ifdef __BORLANDC__
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215 #ifdef __BORLANDC__
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221 #ifdef __BORLANDC__
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230 if(errorflag==false)
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232 // Don't hog all available EMS
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233 size = gvar->pm.emm.EMSAvail * (long)EMSPageSize;
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234 if (size - (EMSPageSize * 2) > (gvar->pm.fi.ChunksInFile * (long)PMPageSize))
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236 size = (gvar->pm.fi.ChunksInFile * (long)PMPageSize) + EMSPageSize;
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237 gvar->pm.emm.EMSAvail = size / EMSPageSize;
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242 mov ah,EMS_ALLOCPAGES
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249 #ifdef __BORLANDC__
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253 #ifdef __BORLANDC__
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259 #ifdef __BORLANDC__
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267 if(errorflag==false)
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269 gvar->mmi.EMSmem = EMSAvail * (dword)EMSPageSize;
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271 // Initialize EMS mapping cache
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272 for (i = 0;i < EMSFrameCount;i++)
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273 gvar->pm.emm.EMSList[i].baseEMSPage = -1;
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278 strcpy(str,"PML_StartupEMS: EMS error ");
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279 MM_EMSerr(str, err);
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280 printf("%s\n",str);
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281 return(gvar->pm.emm.EMSPresent);
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284 gvar->pm.emm.EMSPresent = true; // We have EMS
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285 gvar->pm.emm.EMSPageFrame = EMSPageFrame;
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286 gvar->pm.emm.EMSAvail = EMSAvail;
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287 gvar->pm.emm.EMSVer = EMSVer;
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288 gvar->pm.emm.EMSHandle = EMSHandle;
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289 gvar->pm.emm.freeEMSpages = freeEMSpages;
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290 gvar->pm.emm.totalEMSpages = totalEMSpages;
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292 return(gvar->pm.emm.EMSPresent);
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296 // PML_ShutdownEMS() - If EMS was used, deallocate it
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299 PML_ShutdownEMS(global_game_variables_t *gvar)
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304 boolean errorflag=false;
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305 EMSHandle=gvar->pm.emm.EMSHandle;
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307 if (gvar->pm.emm.EMSPresent)
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310 mov ah,EMS_FREEPAGES
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315 #ifdef __BORLANDC__
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319 #ifdef __BORLANDC__
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325 #ifdef __BORLANDC__
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332 if(errorflag==true)
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334 strcpy(str,"PML_ShutdownEMS: Error freeing EMS ");
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335 MM_EMSerr(str, err);
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336 printf("%s\n",str);
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337 Quit("PML_ShutdownEMS: Error freeing EMS\n");
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343 /////////////////////////////////////////////////////////////////////////////
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345 // XMS Management code
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347 /////////////////////////////////////////////////////////////////////////////
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350 // PML_StartupXMS() - Starts up XMS for the Page Mgr's use
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351 // Checks for presence of an XMS driver
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352 // Makes sure that there's at least a page of XMS available
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353 // Allocates any remaining XMS (rounded down to the nearest page size)
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356 PML_StartupXMS(global_game_variables_t *gvar)
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358 //TODO: translate the _REG into working assembly
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359 //#define STARTUPXMSASM
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361 word XMSAvail, XMSHandle;//, XMSVer;
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362 boolean errorflag=false;
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364 gvar->pm.xmm.XMSPresent = false; // Assume failure
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365 XMSAvail = gvar->mmi.XMSmem = 0;
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369 int XMS_INT // Check for presence of XMS driver
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375 int XMS_INT // Get address of XMS driver
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376 mov [WORD PTR XMSDriver],bx
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377 mov [WORD PTR XMSDriver+2],es // function pointer to XMS driver
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380 call [DWORD PTR XMSDriver] //; Get XMS Version Number
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384 #ifdef STARTUPXMSASM
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385 mov ah,XMS_QUERYFREE // Find out how much XMS is available
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386 call [DWORD PTR XMSDriver]
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388 or ax,ax // AJR: bugfix 10/8/92
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393 #ifdef __BORLANDC__
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397 #ifdef __BORLANDC__
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403 #ifdef __BORLANDC__
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410 if(errorflag==true) goto error;
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411 #ifndef STARTUPXMSASM
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412 XMS_CALL(XMS_QUERYFREE); // Find out how much XMS is available
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414 if (!_AX) // AJR: bugfix 10/8/92
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423 #ifdef __DEBUG_PM__
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424 printf("XMSVer=%02X ", XMSVer);
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425 printf("XMSAvail=%u\n", XMSAvail);
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428 XMSAvail &= ~(PMPageSizeKB - 1); // Round off to nearest page size
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429 if (XMSAvail < (PMPageSizeKB * 2)) // Need at least 2 pages
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434 #ifdef STARTUPXMSASM
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437 mov ah,XMS_ALLOC // And do the allocation
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438 call [DWORD PTR XMSDriver]
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440 or ax,ax // AJR: bugfix 10/8/92
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444 #ifdef __BORLANDC__
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448 #ifdef __BORLANDC__
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454 #ifdef __BORLANDC__
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463 XMS_CALL(XMS_ALLOC); // And do the allocation
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465 if (!_AX) // AJR: bugfix 10/8/92
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474 if(errorflag==false)
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476 gvar->mmi.XMSmem = (dword)(XMSAvail) * 1024;
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477 gvar->pm.xmm.XMSAvail = XMSAvail;
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478 gvar->pm.xmm.XMSHandle = XMSHandle;
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479 //gvar->pm.xmm.XMSVer = XMSVer;
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480 gvar->pm.xmm.XMSPresent = true;
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481 #ifdef __DEBUG_PM__
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482 printf(" XMSmem=%lu XMSAvail=%u\n", gvar->mmi.XMSmem, XMSAvail);
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487 #ifdef __DEBUG_PM__
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488 //printf("XMSHandle\n");
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489 //printf(" 1=%u 2=%u 3=%u 4=%u\n", XMSHandle1, XMSHandle2, XMSHandle3, XMSHandle4);
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490 //printf(" 2=%u ", XMSHandle);
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491 //printf(" %u", gvar->pm.xmm.XMSHandle);
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492 printf(" err=%02X e=%u\n", err, e);
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495 return(gvar->pm.xmm.XMSPresent);
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499 // PML_XMSCopy() - Copies a main/EMS page to or from XMS
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500 // Will round an odd-length request up to the next even value
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503 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)
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509 word source_handle;
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510 dword source_offset;
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511 word target_handle;
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512 dword target_offset;
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517 Quit("PML_XMSCopy: zero address\n");
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521 xoffset = (dword)xmspage * PMPageSize;
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523 copy.length = (length + 1) & ~1;
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524 copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;
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525 copy.source_offset = toxms? (long)addr : xoffset;
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526 copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;
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527 copy.target_offset = toxms? xoffset : (long)addr;
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533 XMS_CALL(XMS_MOVE);
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539 Quit("PML_XMSCopy: Error on copy");
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545 #define PML_CopyToXMS(s,t,l,gvar) PML_XMSCopy(true,(s),(t),(l),(gvar))
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546 #define PML_CopyFromXMS(t,s,l,gvar) PML_XMSCopy(false,(t),(s),(l),(gvar))
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549 // PML_CopyToXMS() - Copies the specified number of bytes from the real mode
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550 // segment address to the specified XMS page
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553 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)
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555 PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);
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559 // PML_CopyFromXMS() - Copies the specified number of bytes from an XMS
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560 // page to the specified real mode address
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563 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)
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565 PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);
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570 // PML_ShutdownXMS()
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573 PML_ShutdownXMS(global_game_variables_t *gvar)
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575 boolean errorflag=false;
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576 word XMSHandle = gvar->pm.xmm.XMSHandle;
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577 if (gvar->pm.xmm.XMSPresent)
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581 //XMS_CALL(XMS_FREE);
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583 call [DWORD PTR XMSDriver]
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587 #ifdef __BORLANDC__
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591 #ifdef __BORLANDC__
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597 #ifdef __BORLANDC__
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604 if(errorflag==true)
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606 Quit("PML_ShutdownXMS: Error freeing XMS");
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612 /////////////////////////////////////////////////////////////////////////////
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614 // Main memory code
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616 /////////////////////////////////////////////////////////////////////////////
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619 // PM_SetMainMemPurge() - Sets the purge level for all allocated main memory
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620 // blocks. This shouldn't be called directly - the PM_LockMainMem() and
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621 // PM_UnlockMainMem() macros should be used instead.
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624 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)
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628 if(gvar->pm.mm.MainPresent)
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629 for (i = 0;i < PMMaxMainMem;i++)
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631 #ifdef __DEBUG_PM__
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632 printf("PM_SetMainMemPurge() info of gvar->pm.mm.MainMemPages[i]\n");
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633 printf("& %Fp, %Fp\n", &gvar->pm.mm.MainMemPages[i], &(gvar->pm.mm.MainMemPages[i]));
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635 if (gvar->pm.mm.MainMemPages[i])
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636 MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);
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641 Quit("MainPresent IS NULL\n");
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646 // PM_CheckMainMem() - If something besides the Page Mgr makes requests of
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647 // the Memory Mgr, some of the Page Mgr's blocks may have been purged,
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648 // so this function runs through the block list and checks to see if
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649 // any of the blocks have been purged. If so, it marks the corresponding
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650 // page as purged & unlocked, then goes through the block list and
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651 // tries to reallocate any blocks that have been purged.
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652 // This routine now calls PM_LockMainMem() to make sure that any allocation
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653 // attempts made during the block reallocation sweep don't purge any
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654 // of the other blocks. Because PM_LockMainMem() is called,
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655 // PM_UnlockMainMem() needs to be called before any other part of the
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656 // program makes allocation requests of the Memory Mgr.
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659 PM_CheckMainMem(global_game_variables_t *gvar)
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661 boolean allocfailed;
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665 PageListStruct far *page;
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667 if (!gvar->pm.mm.MainPresent)
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670 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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672 n = page->mainPage;
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673 if (n != -1) // Is the page using main memory?
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675 if (!gvar->pm.mm.MainMemPages[n]) // Yep, was the block purged?
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677 page->mainPage = -1; // Yes, mark page as purged & unlocked
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678 page->locked = pml_Unlocked;
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683 // Prevent allocation attempts from purging any of our other blocks
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684 PM_LockMainMem(gvar);
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685 allocfailed = false;
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686 for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)
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688 if (!*p) // If the page got purged
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690 if (*used & pmba_Allocated) // If it was allocated
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692 *used &= ~pmba_Allocated; // Mark as unallocated
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693 gvar->pm.mm.MainPagesAvail--; // and decrease available count
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696 if (*used & pmba_Used) // If it was used
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698 *used &= ~pmba_Used; // Mark as unused
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699 gvar->pm.MainPagesUsed--; // and decrease used count
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704 MM_BombOnError(false, gvar);
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705 MM_GetPtr(p,PMPageSize, gvar); // Try to reallocate
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706 if (gvar->mm.mmerror) // If it failed,
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707 allocfailed = true; // don't try any more allocations
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708 else // If it worked,
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710 *used |= pmba_Allocated; // Mark as allocated
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711 gvar->pm.mm.MainPagesAvail++; // and increase available count
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713 MM_BombOnError(true, gvar);
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717 if (gvar->mm.mmerror)
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718 gvar->mm.mmerror = false;
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722 // PML_StartupMainMem() - Allocates as much main memory as is possible for
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723 // the Page Mgr. The memory is allocated as non-purgeable, so if it's
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724 // necessary to make requests of the Memory Mgr, PM_UnlockMainMem()
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725 // needs to be called.
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728 PML_StartupMainMem(global_game_variables_t *gvar)
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733 gvar->pm.mm.MainPagesAvail = 0;
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734 gvar->pm.mm.MainPresent = false;
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735 MM_BombOnError(false, gvar);
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736 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
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738 MM_GetPtr(p,PMPageSize, gvar);
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739 if (gvar->mm.mmerror)
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742 gvar->pm.mm.MainPagesAvail++;
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743 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;
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745 MM_BombOnError(true, gvar);
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746 if (gvar->mm.mmerror)
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747 gvar->mm.mmerror = false;
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748 if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)
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750 Quit("PM_SetupMainMem: Not enough main memory");
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753 gvar->pm.mm.MainPresent = true;
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757 // PML_ShutdownMainMem() - Frees all of the main memory blocks used by the
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761 PML_ShutdownMainMem(global_game_variables_t *gvar)
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766 // DEBUG - mark pages as unallocated & decrease page count as appropriate
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767 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
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769 MM_FreePtr(p, gvar);
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772 /////////////////////////////////////////////////////////////////////////////
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774 // File management code
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776 /////////////////////////////////////////////////////////////////////////////
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779 // PML_ReadFromFile() - Reads some data in from the page file
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782 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)
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786 Quit("PML_ReadFromFile: Null pointer");
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791 Quit("PML_ReadFromFile: Zero offset");
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794 if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)
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796 Quit("PML_ReadFromFile: Seek failed");
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799 if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))
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801 Quit("PML_ReadFromFile: Read failed");
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807 // PML_OpenPageFile() - Opens the page file and sets up the page info
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810 PML_OpenPageFile(global_game_variables_t *gvar)
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816 dword far *offsetptr;
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817 word far *lengthptr;
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818 PageListStruct far *page;
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820 gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);
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821 if (gvar->pm.fi.PageFile == -1)
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823 Quit("PML_OpenPageFile: Unable to open page file");
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827 // Read in header variables
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828 read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));
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829 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));
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830 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));
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832 // Allocate and clear the page list
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833 gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;
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834 MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);
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835 MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);
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836 gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;
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837 _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);
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839 // Read in the chunk offsets
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840 size = sizeof(dword) * gvar->pm.fi.ChunksInFile;
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841 MM_GetPtr(&buf, size, gvar);
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842 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
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844 Quit("PML_OpenPageFile: Offset read failed");
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847 offsetptr = (dword far *)buf;
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848 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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849 page->offset = *offsetptr++;
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850 MM_FreePtr(&buf, gvar);
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852 // Read in the chunk lengths
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853 size = sizeof(word) * gvar->pm.fi.ChunksInFile;
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854 MM_GetPtr(&buf,size, gvar);
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855 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
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857 Quit("PML_OpenPageFile: Length read failed");
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860 lengthptr = (word far *)buf;
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861 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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862 page->length = *lengthptr++;
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863 MM_FreePtr(&buf, gvar);
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867 // PML_ClosePageFile() - Closes the page file
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870 PML_ClosePageFile(global_game_variables_t *gvar)
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872 if (gvar->pm.fi.PageFile != -1)
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873 close(gvar->pm.fi.PageFile);
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874 if (gvar->pm.PMSegPages)
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876 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);
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877 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);
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881 /////////////////////////////////////////////////////////////////////////////
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883 // Allocation, etc., code
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885 /////////////////////////////////////////////////////////////////////////////
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888 // PML_GetEMSAddress()
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890 // Page is in EMS, so figure out which EMS physical page should be used
\r
891 // to map our page in. If normal page, use EMS physical page 3, else
\r
892 // use the physical page specified by the lock type
\r
894 #ifndef __DEBUG_2__
\r
895 #pragma argsused // DEBUG - remove lock parameter
\r
897 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
\r
900 word emsoff,emsbase,offset;
\r
902 emsoff = page & (PMEMSSubPage - 1);
\r
903 emsbase = page - emsoff;
\r
906 // See if this page is already mapped in
\r
907 for (i = 0;i < EMSFrameCount;i++)
\r
909 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)
\r
911 emspage = i; // Yep - don't do a redundant remapping
\r
916 // If page isn't already mapped in, find LRU EMS frame, and use it
\r
919 dword last = LONG_MAX;
\r
920 for (i = 0;i < EMSFrameCount;i++)
\r
922 if (gvar->pm.emm.EMSList[i].lastHit < last)
\r
925 last = gvar->pm.emm.EMSList[i].lastHit;
\r
929 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;
\r
930 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);
\r
934 Quit("PML_GetEMSAddress: EMS find failed");
\r
936 gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;
\r
937 offset = emspage * EMSPageSizeSeg;
\r
938 offset += emsoff * PMPageSizeSeg;
\r
939 return((memptr)(gvar->pm.emm.EMSPageFrame + offset));
\r
943 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
\r
947 emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);
\r
949 PML_MapEMS(page / PMEMSSubPage,emspage);
\r
951 return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)
\r
952 + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));
\r
957 // PM_GetPageAddress() - Returns the address of a given page
\r
958 // Maps in EMS if necessary
\r
959 // Returns nil if block isn't cached into Main Memory or EMS
\r
963 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)
\r
965 PageListStruct far *page;
\r
967 page = &gvar->pm.PMPages[pagenum];
\r
968 if (page->mainPage != -1)
\r
969 return(gvar->pm.mm.MainMemPages[page->mainPage]);
\r
970 else if (page->emsPage != -1)
\r
971 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));
\r
977 // PML_GiveLRUPage() - Returns the page # of the least recently used
\r
978 // present & unlocked main/EMS page (or main page if mainonly is true)
\r
981 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)
\r
985 PageListStruct far *page;
\r
987 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
991 (page->lastHit < last)
\r
992 && ((page->emsPage != -1) || (page->mainPage != -1))
\r
993 && (page->locked == pml_Unlocked)
\r
994 && (!(mainonly && (page->mainPage == -1)))
\r
997 last = page->lastHit;
\r
1003 Quit("PML_GiveLRUPage: LRU Search failed");
\r
1008 // PML_GiveLRUXMSPage() - Returns the page # of the least recently used
\r
1009 // (and present) XMS page.
\r
1010 // This routine won't return the XMS page protected (by XMSProtectPage)
\r
1013 PML_GiveLRUXMSPage(global_game_variables_t *gvar)
\r
1017 PageListStruct far *page;
\r
1019 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
1023 (page->xmsPage != -1)
\r
1024 && (page->lastHit < last)
\r
1025 && (i != gvar->pm.xmm.XMSProtectPage)
\r
1028 last = page->lastHit;
\r
1036 // PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace
\r
1037 // it with the main/EMS page
\r
1040 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)
\r
1043 PageListStruct far *page;
\r
1045 if (!gvar->pm.xmm.XMSPresent)
\r
1048 page = &gvar->pm.PMPages[pagenum];
\r
1049 if (page->xmsPage != -1)
\r
1050 return; // Already in XMS
\r
1052 if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)
\r
1053 page->xmsPage = gvar->pm.XMSPagesUsed++;
\r
1056 usexms = PML_GiveLRUXMSPage(gvar);
\r
1058 Quit("PML_PutPageInXMS: No XMS LRU");
\r
1059 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;
\r
1060 gvar->pm.PMPages[usexms].xmsPage = -1;
\r
1062 PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);
\r
1066 // PML_TransferPageSpace() - A page is being replaced, so give the new page
\r
1067 // the old one's address space. Returns the address of the new page.
\r
1070 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)
\r
1073 PageListStruct far *origpage,far *newpage;
\r
1076 Quit("PML_TransferPageSpace: Identity replacement");
\r
1078 origpage = &gvar->pm.PMPages[orig];
\r
1079 newpage = &gvar->pm.PMPages[new];
\r
1081 if (origpage->locked != pml_Unlocked)
\r
1082 Quit("PML_TransferPageSpace: Killing locked page");
\r
1084 if ((origpage->emsPage == -1) && (origpage->mainPage == -1))
\r
1085 Quit("PML_TransferPageSpace: Reusing non-existent page");
\r
1087 // Copy page that's about to be purged into XMS
\r
1088 PML_PutPageInXMS(orig, gvar);
\r
1090 // Get the address, and force EMS into a physical page if necessary
\r
1091 addr = PM_GetPageAddress(orig, gvar);
\r
1093 // Steal the address
\r
1094 newpage->emsPage = origpage->emsPage;
\r
1095 newpage->mainPage = origpage->mainPage;
\r
1097 // Mark replaced page as purged
\r
1098 origpage->mainPage = origpage->emsPage = -1;
\r
1101 Quit("PML_TransferPageSpace: Zero replacement");
\r
1107 // PML_GetAPageBuffer() - A page buffer is needed. Either get it from the
\r
1108 // main/EMS free pool, or use PML_GiveLRUPage() to find which page to
\r
1109 // steal the buffer from. Returns a far pointer to the page buffer, and
\r
1110 // sets the fields inside the given page structure appropriately.
\r
1111 // If mainonly is true, free EMS will be ignored, and only main pages
\r
1112 // will be looked at by PML_GiveLRUPage().
\r
1115 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1117 byte far *addr = nil;
\r
1119 PMBlockAttr *used;
\r
1120 PageListStruct far *page;
\r
1122 page = &gvar->pm.PMPages[pagenum];
\r
1123 if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)
\r
1125 // There's remaining EMS - use it
\r
1126 page->emsPage = gvar->pm.EMSPagesUsed++;
\r
1127 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);
\r
1129 else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)
\r
1131 // There's remaining main memory - use it
\r
1132 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)
\r
1134 if ((*used & pmba_Allocated) && !(*used & pmba_Used))
\r
1137 *used |= pmba_Used;
\r
1142 Quit("PML_GetPageBuffer: MainPagesAvail lied");
\r
1143 addr = gvar->pm.mm.MainMemPages[n];
\r
1145 Quit("PML_GetPageBuffer: Purged main block");
\r
1146 page->mainPage = n;
\r
1147 gvar->pm.MainPagesUsed++;
\r
1150 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);
\r
1153 Quit("PML_GetPageBuffer: Search failed");
\r
1158 // PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and
\r
1159 // replace it with the page from XMS. If mainonly is true, will only
\r
1160 // search for LRU main page.
\r
1161 // XMSProtectPage is set to the page to be retrieved from XMS, so that if
\r
1162 // the page from which we're stealing the main/EMS from isn't in XMS,
\r
1163 // it won't copy over the page that we're trying to get from XMS.
\r
1164 // (pages that are being purged are copied into XMS, if possible)
\r
1167 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1169 byte far *checkaddr;
\r
1170 memptr addr = nil;
\r
1171 PageListStruct far *page;
\r
1173 page = &gvar->pm.PMPages[pagenum];
\r
1174 if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))
\r
1176 gvar->pm.xmm.XMSProtectPage = pagenum;
\r
1177 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
1178 if (FP_OFF(checkaddr))
\r
1179 Quit("PML_GetPageFromXMS: Non segment pointer");
\r
1180 addr = (memptr)FP_SEG(checkaddr);
\r
1181 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);
\r
1182 gvar->pm.xmm.XMSProtectPage = -1;
\r
1189 // PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.
\r
1190 // Load it into either main or EMS. If mainonly is true, the page will
\r
1191 // only be loaded into main.
\r
1194 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1197 PageListStruct far *page;
\r
1199 addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
1200 page = &gvar->pm.PMPages[pagenum];
\r
1201 PML_ReadFromFile(addr,page->offset,page->length, gvar);
\r
1205 // PM_GetPage() - Returns the address of the page, loading it if necessary
\r
1206 // First, check if in Main Memory or EMS
\r
1207 // Then, check XMS
\r
1208 // If not in XMS, load into Main Memory or EMS
\r
1212 PM_GetPage(int pagenum, global_game_variables_t *gvar)
\r
1216 if (pagenum >= gvar->pm.fi.ChunksInFile)
\r
1217 Quit("PM_GetPage: Invalid page request");
\r
1219 #ifdef __DEBUG_2__ // for debugging
\r
1221 mov dx,STATUS_REGISTER_1
\r
1224 mov al,ATR_OVERSCAN
\r
1226 mov al,10 // bright green
\r
1231 if (!(result = PM_GetPageAddress(pagenum, gvar)))
\r
1233 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);
\r
1234 if (!gvar->pm.PMPages[pagenum].offset) // JDC: sparse page
\r
1235 Quit ("Tried to load a sparse page!");
\r
1236 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))
\r
1238 if (gvar->pm.PMPages[pagenum].lastHit == gvar->pm.PMFrameCount)
\r
1239 gvar->pm.PMThrashing++;
\r
1241 PML_LoadPage(pagenum,mainonly, gvar);
\r
1242 result = PM_GetPageAddress(pagenum, gvar);
\r
1245 gvar->pm.PMPages[pagenum].lastHit = gvar->pm.PMFrameCount;
\r
1247 #ifdef __DEBUG_2__ // for debugging
\r
1249 mov dx,STATUS_REGISTER_1
\r
1252 mov al,ATR_OVERSCAN
\r
1256 mov al,0x20 // normal
\r
1265 // PM_SetPageLock() - Sets the lock type on a given page
\r
1266 // pml_Unlocked: Normal, page can be purged
\r
1267 // pml_Locked: Cannot be purged
\r
1268 // pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page
\r
1269 // specified when returning the address. For sound stuff.
\r
1272 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)
\r
1274 if (pagenum < gvar->pm.fi.PMSoundStart)
\r
1275 Quit("PM_SetPageLock: Locking/unlocking non-sound page");
\r
1277 gvar->pm.PMPages[pagenum].locked = lock;
\r
1281 // PM_Preload() - Loads as many pages as possible into all types of memory.
\r
1282 // Calls the update function after each load, indicating the current
\r
1283 // page, and the total pages that need to be loaded (for thermometer).
\r
1286 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)
\r
1290 word current,total,
\r
1291 totalnonxms,totalxms,
\r
1292 mainfree,maintotal,
\r
1296 PageListStruct far *p;
\r
1298 mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);
\r
1299 xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);
\r
1301 xmstotal = maintotal = 0;
\r
1303 for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)
\r
1305 if (!gvar->pm.PMPages[i].offset)
\r
1306 continue; // sparse
\r
1308 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )
\r
1309 continue; // already in main mem
\r
1316 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )
\r
1324 total = maintotal + xmstotal;
\r
1333 // cache main/ems blocks
\r
1337 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1
\r
1338 || gvar->pm.PMPages[page].emsPage != -1 )
\r
1341 if (page >= gvar->pm.fi.ChunksInFile)
\r
1342 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1344 PM_GetPage(page, gvar);
\r
1349 update(current,total);
\r
1353 // load stuff to XMS
\r
1357 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)
\r
1359 addr = PM_GetPage(oogypage, gvar);
\r
1361 Quit("PM_Preload: XMS buffer failed");
\r
1365 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )
\r
1368 if (page >= gvar->pm.fi.ChunksInFile)
\r
1369 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1371 p = &gvar->pm.PMPages[page];
\r
1373 p->xmsPage = gvar->pm.XMSPagesUsed++;
\r
1374 if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)
\r
1375 Quit("PM_Preload: Exceeded XMS pages");
\r
1376 if (p->length > PMPageSize)
\r
1377 Quit("PM_Preload: Page too long");
\r
1379 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1380 PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);
\r
1385 update(current,total);
\r
1388 p = &gvar->pm.PMPages[oogypage];
\r
1389 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1392 update(total,total);
\r
1395 /////////////////////////////////////////////////////////////////////////////
\r
1399 /////////////////////////////////////////////////////////////////////////////
\r
1402 // PM_NextFrame() - Increments the frame counter and adjusts the thrash
\r
1403 // avoidence variables
\r
1405 // If currently in panic mode (to avoid thrashing), check to see if the
\r
1406 // appropriate number of frames have passed since the last time that
\r
1407 // we would have thrashed. If so, take us out of panic mode.
\r
1411 PM_NextFrame(global_game_variables_t *gvar)
\r
1415 // Frame count overrun - kill the LRU hit entries & reset frame count
\r
1416 if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)
\r
1418 for (i = 0;i < gvar->pm.PMNumBlocks;i++)
\r
1419 gvar->pm.PMPages[i].lastHit = 0;
\r
1420 gvar->pm.PMFrameCount = 0;
\r
1424 for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)
\r
1426 if (gvar->pm.PMPages[i].locked)
\r
1429 sprintf(buf,"PM_NextFrame: Page %d is locked",i);
\r
1435 if (gvar->pm.PMPanicMode)
\r
1437 // DEBUG - set border color
\r
1438 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))
\r
1440 // DEBUG - reset border color
\r
1443 if (gvar->pm.PMThrashing >= PMThrashThreshold)
\r
1444 gvar->pm.PMPanicMode = PMUnThrashThreshold;
\r
1445 gvar->pm.PMThrashing = false;
\r
1449 // PM_Reset() - Sets up caching structures
\r
1452 PM_Reset(global_game_variables_t *gvar)
\r
1455 PageListStruct far *page;
\r
1457 gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;
\r
1459 gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);
\r
1460 gvar->pm.emm.EMSPhysicalPage = 0;
\r
1462 gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;
\r
1464 gvar->pm.PMPanicMode = false;
\r
1466 gvar->pm.fi.PageFile = -1;
\r
1467 gvar->pm.xmm.XMSProtectPage = -1;
\r
1469 // Initialize page list
\r
1470 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)
\r
1472 page->mainPage = -1;
\r
1473 page->emsPage = -1;
\r
1474 page->xmsPage = -1;
\r
1475 page->locked = false;
\r
1480 // PM_Startup() - Start up the Page Mgr
\r
1483 PM_Startup(global_game_variables_t *gvar)
\r
1485 boolean nomain,noems,noxms;
\r
1488 if (gvar->pm.PMStarted)
\r
1491 //strcpy(&(gvar->pm.fi.PageFileName), "VSWAP.");
\r
1493 nomain = noems = noxms = false;
\r
1494 for (i = 1;i < _argc;i++)
\r
1496 switch (US_CheckParm(_argv[i],ParmStrings))
\r
1510 //0000+=+=PML_OpenPageFile(gvar);
\r
1512 if (!noems && MML_CheckForEMS())
\r
1513 PML_StartupEMS(gvar);
\r
1514 if (!noxms && MML_CheckForXMS())
\r
1515 PML_StartupXMS(gvar);
\r
1517 PML_StartupMainMem(gvar);
\r
1519 if (!gvar->pm.mm.MainPresent && !gvar->pm.emm.EMSPresent && !gvar->pm.xmm.XMSPresent)
\r
1521 Quit("PM_Startup: No main or EMS\n");
\r
1527 gvar->pm.PMStarted = true;
\r
1531 // PM_Shutdown() - Shut down the Page Mgr
\r
1534 PM_Shutdown(global_game_variables_t *gvar)
\r
1536 if(MML_CheckForXMS()) PML_ShutdownXMS(gvar);
\r
1537 if(MML_CheckForEMS()) PML_ShutdownEMS(gvar);
\r
1539 if (!gvar->pm.PMStarted)
\r
1542 //PML_ClosePageFile(gvar);
\r
1544 PML_ShutdownMainMem(gvar);
\r