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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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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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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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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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 boolean PMStarted, MainPresent, EMSPresent, XMSPresent;
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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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90 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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147 boolean errorflag=0;
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148 static char emmname[] = "EMMXXXX0"; //fix by andrius4669
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149 unsigned int EMSVer = 0;
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150 unsigned totalEMSpages,freeEMSpages,EMSPageFrame,EMSHandle,EMSAvail;
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151 totalEMSpages = freeEMSpages = EMSPageFrame = 0;
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152 EMSPresent = false; // Assume that we'll fail
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153 gvar->pm.emm.EMSAvail = 0;
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156 mov dx,OFFSET emmname //fix by andrius4669
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158 int EMS_INT // try to open EMMXXXX0 device
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164 int EMS_INT // get device info
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172 int EMS_INT // get status
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178 int EMS_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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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 += gvar->pm.emm.EMSAvail * (long)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(EMSPresent);
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283 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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289 return(EMSPresent);
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293 // PML_ShutdownEMS() - If EMS was used, deallocate it
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296 PML_ShutdownEMS(global_game_variables_t *gvar)
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299 EMSHandle=gvar->pm.emm.EMSHandle;
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304 mov ah,EMS_FREEPAGES
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310 Quit("PML_ShutdownEMS: Error freeing EMS\n");
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316 /////////////////////////////////////////////////////////////////////////////
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318 // XMS Management code
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320 /////////////////////////////////////////////////////////////////////////////
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323 // PML_StartupXMS() - Starts up XMS for the Page Mgr's use
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324 // Checks for presence of an XMS driver
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325 // Makes sure that there's at least a page of XMS available
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326 // Allocates any remaining XMS (rounded down to the nearest page size)
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329 PML_StartupXMS(global_game_variables_t *gvar)
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331 XMSPresent = false; // Assume failure
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332 gvar->pm.xmm.XMSAvail = 0;
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335 geninterrupt(XMS_INT); // Check for presence of XMS driver
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342 int XMS_INT // Get address of XMS driver
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343 mov [WORD PTR XMSDriver],bx
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344 mov [WORD PTR XMSDriver+2],es // function pointer to XMS driver
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347 XMS_CALL(XMS_QUERYFREE); // Find out how much XMS is available
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348 gvar->pm.xmm.XMSAvail = _AX;
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349 if (!_AX) // AJR: bugfix 10/8/92
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352 gvar->pm.xmm.XMSAvail &= ~(PMPageSizeKB - 1); // Round off to nearest page size
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353 if (gvar->pm.xmm.XMSAvail < (PMPageSizeKB * 2)) // Need at least 2 pages
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356 _DX = gvar->pm.xmm.XMSAvail;
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357 XMS_CALL(XMS_ALLOC); // And do the allocation
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358 gvar->pm.xmm.XMSHandle = _DX;
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360 if (!_AX) // AJR: bugfix 10/8/92
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362 gvar->pm.xmm.XMSAvail = 0;
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366 gvar->mmi.XMSmem += gvar->pm.xmm.XMSAvail * 1024;
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370 return(XMSPresent);
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374 // PML_XMSCopy() - Copies a main/EMS page to or from XMS
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375 // Will round an odd-length request up to the next even value
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378 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)
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384 word source_handle;
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385 dword source_offset;
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386 word target_handle;
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387 dword target_offset;
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392 Quit("PML_XMSCopy: zero address\n");
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396 xoffset = (dword)xmspage * PMPageSize;
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398 copy.length = (length + 1) & ~1;
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399 copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;
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400 copy.source_offset = toxms? (long)addr : xoffset;
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401 copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;
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402 copy.target_offset = toxms? xoffset : (long)addr;
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408 XMS_CALL(XMS_MOVE);
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414 Quit("PML_XMSCopy: Error on copy");
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420 #define PML_CopyToXMS(s,t,l,gvar) PML_XMSCopy(true,(s),(t),(l),(gvar))
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421 #define PML_CopyFromXMS(t,s,l,gvar) PML_XMSCopy(false,(t),(s),(l),(gvar))
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424 // PML_CopyToXMS() - Copies the specified number of bytes from the real mode
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425 // segment address to the specified XMS page
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428 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)
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430 PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);
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434 // PML_CopyFromXMS() - Copies the specified number of bytes from an XMS
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435 // page to the specified real mode address
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438 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)
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440 PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);
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445 // PML_ShutdownXMS()
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448 PML_ShutdownXMS(global_game_variables_t *gvar)
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452 _DX = gvar->pm.xmm.XMSHandle;
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453 XMS_CALL(XMS_FREE);
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456 Quit("PML_ShutdownXMS: Error freeing XMS");
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462 /////////////////////////////////////////////////////////////////////////////
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464 // Main memory code
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466 /////////////////////////////////////////////////////////////////////////////
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469 // PM_SetMainMemPurge() - Sets the purge level for all allocated main memory
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470 // blocks. This shouldn't be called directly - the PM_LockMainMem() and
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471 // PM_UnlockMainMem() macros should be used instead.
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474 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)
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479 for (i = 0;i < PMMaxMainMem;i++)
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481 #ifdef __DEBUG_PM__
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482 printf("PM_SetMainMemPurge() info of gvar->pm.mm.MainMemPages[i]\n");
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483 //printf(" %Fp, %Fp\n", gvar->pm.mm.MainMemPages[i], (gvar->pm.mm.MainMemPages[i]));
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484 printf("& %Fp, %Fp\n", &gvar->pm.mm.MainMemPages[i], &(gvar->pm.mm.MainMemPages[i]));
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485 //MM_ShowMemory(gvar);
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486 //MM_DumpData(gvar);
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487 //MM_Report_(gvar);
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489 if (gvar->pm.mm.MainMemPages[i])
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490 MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);
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495 printf("MainPresent IS NULL\n");
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496 printf("%x ", MainPresent);
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502 // PM_CheckMainMem() - If something besides the Page Mgr makes requests of
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503 // the Memory Mgr, some of the Page Mgr's blocks may have been purged,
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504 // so this function runs through the block list and checks to see if
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505 // any of the blocks have been purged. If so, it marks the corresponding
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506 // page as purged & unlocked, then goes through the block list and
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507 // tries to reallocate any blocks that have been purged.
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508 // This routine now calls PM_LockMainMem() to make sure that any allocation
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509 // attempts made during the block reallocation sweep don't purge any
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510 // of the other blocks. Because PM_LockMainMem() is called,
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511 // PM_UnlockMainMem() needs to be called before any other part of the
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512 // program makes allocation requests of the Memory Mgr.
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515 PM_CheckMainMem(global_game_variables_t *gvar)
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517 boolean allocfailed;
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521 PageListStruct far *page;
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526 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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528 n = page->mainPage;
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529 if (n != -1) // Is the page using main memory?
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531 if (!gvar->pm.mm.MainMemPages[n]) // Yep, was the block purged?
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533 page->mainPage = -1; // Yes, mark page as purged & unlocked
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534 page->locked = pml_Unlocked;
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539 // Prevent allocation attempts from purging any of our other blocks
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540 PM_LockMainMem(gvar);
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541 allocfailed = false;
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542 for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)
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544 if (!*p) // If the page got purged
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546 if (*used & pmba_Allocated) // If it was allocated
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548 *used &= ~pmba_Allocated; // Mark as unallocated
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549 gvar->pm.mm.MainPagesAvail--; // and decrease available count
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552 if (*used & pmba_Used) // If it was used
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554 *used &= ~pmba_Used; // Mark as unused
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555 gvar->pm.MainPagesUsed--; // and decrease used count
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560 MM_BombOnError(false, gvar);
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561 MM_GetPtr(p,PMPageSize, gvar); // Try to reallocate
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562 if (gvar->mm.mmerror) // If it failed,
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563 allocfailed = true; // don't try any more allocations
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564 else // If it worked,
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566 *used |= pmba_Allocated; // Mark as allocated
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567 gvar->pm.mm.MainPagesAvail++; // and increase available count
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569 MM_BombOnError(true, gvar);
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573 if (gvar->mm.mmerror)
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574 gvar->mm.mmerror = false;
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578 // PML_StartupMainMem() - Allocates as much main memory as is possible for
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579 // the Page Mgr. The memory is allocated as non-purgeable, so if it's
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580 // necessary to make requests of the Memory Mgr, PM_UnlockMainMem()
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581 // needs to be called.
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584 PML_StartupMainMem(global_game_variables_t *gvar)
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589 gvar->pm.mm.MainPagesAvail = 0;
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590 MainPresent = false;
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591 MM_BombOnError(false, gvar);
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592 printf("PML_StartupMainMem()\n");
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593 printf(" p=%04x MainMemPages=%04x\n", p, gvar->pm.mm.MainMemPages);
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594 printf(" p=%Fp MainMemPages=%Fp\n", p, gvar->pm.mm.MainMemPages);
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595 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
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597 MM_GetPtr(p,PMPageSize, gvar);
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598 if (gvar->mm.mmerror)
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601 gvar->pm.mm.MainPagesAvail++;
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602 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;
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604 MM_BombOnError(true, gvar);
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605 if (gvar->mm.mmerror)
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606 gvar->mm.mmerror = false;
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607 if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)
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609 Quit("PM_SetupMainMem: Not enough main memory");
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612 MainPresent = true;
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616 // PML_ShutdownMainMem() - Frees all of the main memory blocks used by the
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620 PML_ShutdownMainMem(global_game_variables_t *gvar)
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625 // DEBUG - mark pages as unallocated & decrease page count as appropriate
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626 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
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628 MM_FreePtr(p, gvar);
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631 /////////////////////////////////////////////////////////////////////////////
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633 // File management code
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635 /////////////////////////////////////////////////////////////////////////////
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638 // PML_ReadFromFile() - Reads some data in from the page file
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641 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)
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645 Quit("PML_ReadFromFile: Null pointer");
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650 Quit("PML_ReadFromFile: Zero offset");
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653 if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)
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655 Quit("PML_ReadFromFile: Seek failed");
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658 if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))
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660 Quit("PML_ReadFromFile: Read failed");
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666 // PML_OpenPageFile() - Opens the page file and sets up the page info
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669 PML_OpenPageFile(global_game_variables_t *gvar)
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675 dword far *offsetptr;
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676 word far *lengthptr;
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677 PageListStruct far *page;
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679 gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);
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680 if (gvar->pm.fi.PageFile == -1)
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682 //Quit("PML_OpenPageFile: Unable to open page file");
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683 printf("PML_OpenPageFile: Unable to open page file");
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684 printf(": %s\n", gvar->pm.fi.PageFileName);
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689 // Read in header variables
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690 read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));
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691 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));
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692 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));
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694 // Allocate and clear the page list
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695 gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;
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696 MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);
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697 MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);
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698 gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;
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699 _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);
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701 // Read in the chunk offsets
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702 size = sizeof(dword) * gvar->pm.fi.ChunksInFile;
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703 MM_GetPtr(&buf, size, gvar);
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704 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
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706 Quit("PML_OpenPageFile: Offset read failed");
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709 offsetptr = (dword far *)buf;
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710 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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711 page->offset = *offsetptr++;
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712 MM_FreePtr(&buf, gvar);
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714 // Read in the chunk lengths
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715 size = sizeof(word) * gvar->pm.fi.ChunksInFile;
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716 MM_GetPtr(&buf,size, gvar);
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717 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
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719 Quit("PML_OpenPageFile: Length read failed");
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722 lengthptr = (word far *)buf;
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723 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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724 page->length = *lengthptr++;
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725 MM_FreePtr(&buf, gvar);
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729 // PML_ClosePageFile() - Closes the page file
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732 PML_ClosePageFile(global_game_variables_t *gvar)
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734 if (gvar->pm.fi.PageFile != -1)
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735 close(gvar->pm.fi.PageFile);
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736 if (gvar->pm.PMSegPages)
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738 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);
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739 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);
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743 /////////////////////////////////////////////////////////////////////////////
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745 // Allocation, etc., code
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747 /////////////////////////////////////////////////////////////////////////////
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750 // PML_GetEMSAddress()
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752 // Page is in EMS, so figure out which EMS physical page should be used
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753 // to map our page in. If normal page, use EMS physical page 3, else
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754 // use the physical page specified by the lock type
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756 #ifndef __DEBUG_2__
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757 #pragma argsused // DEBUG - remove lock parameter
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759 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
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762 word emsoff,emsbase,offset;
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764 emsoff = page & (PMEMSSubPage - 1);
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765 emsbase = page - emsoff;
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768 // See if this page is already mapped in
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769 for (i = 0;i < EMSFrameCount;i++)
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771 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)
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773 emspage = i; // Yep - don't do a redundant remapping
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778 // If page isn't already mapped in, find LRU EMS frame, and use it
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781 dword last = LONG_MAX;
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782 for (i = 0;i < EMSFrameCount;i++)
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784 if (gvar->pm.emm.EMSList[i].lastHit < last)
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787 last = gvar->pm.emm.EMSList[i].lastHit;
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791 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;
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792 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);
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796 Quit("PML_GetEMSAddress: EMS find failed");
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798 gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;
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799 offset = emspage * EMSPageSizeSeg;
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800 offset += emsoff * PMPageSizeSeg;
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801 return((memptr)(gvar->pm.emm.EMSPageFrame + offset));
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805 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
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809 emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);
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811 PML_MapEMS(page / PMEMSSubPage,emspage);
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813 return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)
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814 + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));
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819 // PM_GetPageAddress() - Returns the address of a given page
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820 // Maps in EMS if necessary
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821 // Returns nil if block isn't cached into Main Memory or EMS
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825 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)
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827 PageListStruct far *page;
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829 page = &gvar->pm.PMPages[pagenum];
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830 if (page->mainPage != -1)
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831 return(gvar->pm.mm.MainMemPages[page->mainPage]);
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832 else if (page->emsPage != -1)
\r
833 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));
\r
839 // PML_GiveLRUPage() - Returns the page # of the least recently used
\r
840 // present & unlocked main/EMS page (or main page if mainonly is true)
\r
843 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)
\r
847 PageListStruct far *page;
\r
849 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
853 (page->lastHit < last)
\r
854 && ((page->emsPage != -1) || (page->mainPage != -1))
\r
855 && (page->locked == pml_Unlocked)
\r
856 && (!(mainonly && (page->mainPage == -1)))
\r
859 last = page->lastHit;
\r
865 Quit("PML_GiveLRUPage: LRU Search failed");
\r
870 // PML_GiveLRUXMSPage() - Returns the page # of the least recently used
\r
871 // (and present) XMS page.
\r
872 // This routine won't return the XMS page protected (by XMSProtectPage)
\r
875 PML_GiveLRUXMSPage(global_game_variables_t *gvar)
\r
879 PageListStruct far *page;
\r
881 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
885 (page->xmsPage != -1)
\r
886 && (page->lastHit < last)
\r
887 && (i != gvar->pm.xmm.XMSProtectPage)
\r
890 last = page->lastHit;
\r
898 // PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace
\r
899 // it with the main/EMS page
\r
902 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)
\r
905 PageListStruct far *page;
\r
910 page = &gvar->pm.PMPages[pagenum];
\r
911 if (page->xmsPage != -1)
\r
912 return; // Already in XMS
\r
914 if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)
\r
915 page->xmsPage = gvar->pm.XMSPagesUsed++;
\r
918 usexms = PML_GiveLRUXMSPage(gvar);
\r
920 Quit("PML_PutPageInXMS: No XMS LRU");
\r
921 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;
\r
922 gvar->pm.PMPages[usexms].xmsPage = -1;
\r
924 PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);
\r
928 // PML_TransferPageSpace() - A page is being replaced, so give the new page
\r
929 // the old one's address space. Returns the address of the new page.
\r
932 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)
\r
935 PageListStruct far *origpage,far *newpage;
\r
938 Quit("PML_TransferPageSpace: Identity replacement");
\r
940 origpage = &gvar->pm.PMPages[orig];
\r
941 newpage = &gvar->pm.PMPages[new];
\r
943 if (origpage->locked != pml_Unlocked)
\r
944 Quit("PML_TransferPageSpace: Killing locked page");
\r
946 if ((origpage->emsPage == -1) && (origpage->mainPage == -1))
\r
947 Quit("PML_TransferPageSpace: Reusing non-existent page");
\r
949 // Copy page that's about to be purged into XMS
\r
950 PML_PutPageInXMS(orig, gvar);
\r
952 // Get the address, and force EMS into a physical page if necessary
\r
953 addr = PM_GetPageAddress(orig, gvar);
\r
955 // Steal the address
\r
956 newpage->emsPage = origpage->emsPage;
\r
957 newpage->mainPage = origpage->mainPage;
\r
959 // Mark replaced page as purged
\r
960 origpage->mainPage = origpage->emsPage = -1;
\r
963 Quit("PML_TransferPageSpace: Zero replacement");
\r
969 // PML_GetAPageBuffer() - A page buffer is needed. Either get it from the
\r
970 // main/EMS free pool, or use PML_GiveLRUPage() to find which page to
\r
971 // steal the buffer from. Returns a far pointer to the page buffer, and
\r
972 // sets the fields inside the given page structure appropriately.
\r
973 // If mainonly is true, free EMS will be ignored, and only main pages
\r
974 // will be looked at by PML_GiveLRUPage().
\r
977 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
979 byte far *addr = nil;
\r
982 PageListStruct far *page;
\r
984 page = &gvar->pm.PMPages[pagenum];
\r
985 if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)
\r
987 // There's remaining EMS - use it
\r
988 page->emsPage = gvar->pm.EMSPagesUsed++;
\r
989 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);
\r
991 else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)
\r
993 // There's remaining main memory - use it
\r
994 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)
\r
996 if ((*used & pmba_Allocated) && !(*used & pmba_Used))
\r
999 *used |= pmba_Used;
\r
1004 Quit("PML_GetPageBuffer: MainPagesAvail lied");
\r
1005 addr = gvar->pm.mm.MainMemPages[n];
\r
1007 Quit("PML_GetPageBuffer: Purged main block");
\r
1008 page->mainPage = n;
\r
1009 gvar->pm.MainPagesUsed++;
\r
1012 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);
\r
1015 Quit("PML_GetPageBuffer: Search failed");
\r
1020 // PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and
\r
1021 // replace it with the page from XMS. If mainonly is true, will only
\r
1022 // search for LRU main page.
\r
1023 // XMSProtectPage is set to the page to be retrieved from XMS, so that if
\r
1024 // the page from which we're stealing the main/EMS from isn't in XMS,
\r
1025 // it won't copy over the page that we're trying to get from XMS.
\r
1026 // (pages that are being purged are copied into XMS, if possible)
\r
1029 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1031 byte far *checkaddr;
\r
1032 memptr addr = nil;
\r
1033 PageListStruct far *page;
\r
1035 page = &gvar->pm.PMPages[pagenum];
\r
1036 if (XMSPresent && (page->xmsPage != -1))
\r
1038 gvar->pm.xmm.XMSProtectPage = pagenum;
\r
1039 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
1040 if (FP_OFF(checkaddr))
\r
1041 Quit("PML_GetPageFromXMS: Non segment pointer");
\r
1042 addr = (memptr)FP_SEG(checkaddr);
\r
1043 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);
\r
1044 gvar->pm.xmm.XMSProtectPage = -1;
\r
1051 // PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.
\r
1052 // Load it into either main or EMS. If mainonly is true, the page will
\r
1053 // only be loaded into main.
\r
1056 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1059 PageListStruct far *page;
\r
1061 addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
1062 page = &gvar->pm.PMPages[pagenum];
\r
1063 PML_ReadFromFile(addr,page->offset,page->length, gvar);
\r
1067 // PM_GetPage() - Returns the address of the page, loading it if necessary
\r
1068 // First, check if in Main Memory or EMS
\r
1069 // Then, check XMS
\r
1070 // If not in XMS, load into Main Memory or EMS
\r
1074 PM_GetPage(int pagenum, global_game_variables_t *gvar)
\r
1078 if (pagenum >= gvar->pm.fi.ChunksInFile)
\r
1079 Quit("PM_GetPage: Invalid page request");
\r
1081 #ifdef __DEBUG_2__ // for debugging
\r
1083 mov dx,STATUS_REGISTER_1
\r
1086 mov al,ATR_OVERSCAN
\r
1088 mov al,10 // bright green
\r
1093 if (!(result = PM_GetPageAddress(pagenum, gvar)))
\r
1095 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);
\r
1096 if (!gvar->pm.PMPages[pagenum].offset) // JDC: sparse page
\r
1097 Quit ("Tried to load a sparse page!");
\r
1098 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))
\r
1100 if (gvar->pm.PMPages[pagenum].lastHit == gvar->pm.PMFrameCount)
\r
1101 gvar->pm.PMThrashing++;
\r
1103 PML_LoadPage(pagenum,mainonly, gvar);
\r
1104 result = PM_GetPageAddress(pagenum, gvar);
\r
1107 gvar->pm.PMPages[pagenum].lastHit = gvar->pm.PMFrameCount;
\r
1109 #ifdef __DEBUG_2__ // for debugging
\r
1111 mov dx,STATUS_REGISTER_1
\r
1114 mov al,ATR_OVERSCAN
\r
1118 mov al,0x20 // normal
\r
1127 // PM_SetPageLock() - Sets the lock type on a given page
\r
1128 // pml_Unlocked: Normal, page can be purged
\r
1129 // pml_Locked: Cannot be purged
\r
1130 // pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page
\r
1131 // specified when returning the address. For sound stuff.
\r
1134 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)
\r
1136 if (pagenum < gvar->pm.fi.PMSoundStart)
\r
1137 Quit("PM_SetPageLock: Locking/unlocking non-sound page");
\r
1139 gvar->pm.PMPages[pagenum].locked = lock;
\r
1143 // PM_Preload() - Loads as many pages as possible into all types of memory.
\r
1144 // Calls the update function after each load, indicating the current
\r
1145 // page, and the total pages that need to be loaded (for thermometer).
\r
1148 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)
\r
1152 word current,total,
\r
1153 totalnonxms,totalxms,
\r
1154 mainfree,maintotal,
\r
1158 PageListStruct far *p;
\r
1160 mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);
\r
1161 xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);
\r
1163 xmstotal = maintotal = 0;
\r
1165 for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)
\r
1167 if (!gvar->pm.PMPages[i].offset)
\r
1168 continue; // sparse
\r
1170 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )
\r
1171 continue; // already in main mem
\r
1178 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )
\r
1186 total = maintotal + xmstotal;
\r
1195 // cache main/ems blocks
\r
1199 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1
\r
1200 || gvar->pm.PMPages[page].emsPage != -1 )
\r
1203 if (page >= gvar->pm.fi.ChunksInFile)
\r
1204 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1206 PM_GetPage(page, gvar);
\r
1211 update(current,total);
\r
1215 // load stuff to XMS
\r
1219 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)
\r
1221 addr = PM_GetPage(oogypage, gvar);
\r
1223 Quit("PM_Preload: XMS buffer failed");
\r
1227 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )
\r
1230 if (page >= gvar->pm.fi.ChunksInFile)
\r
1231 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1233 p = &gvar->pm.PMPages[page];
\r
1235 p->xmsPage = gvar->pm.XMSPagesUsed++;
\r
1236 if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)
\r
1237 Quit("PM_Preload: Exceeded XMS pages");
\r
1238 if (p->length > PMPageSize)
\r
1239 Quit("PM_Preload: Page too long");
\r
1241 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1242 PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);
\r
1247 update(current,total);
\r
1250 p = &gvar->pm.PMPages[oogypage];
\r
1251 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1254 update(total,total);
\r
1257 /////////////////////////////////////////////////////////////////////////////
\r
1261 /////////////////////////////////////////////////////////////////////////////
\r
1264 // PM_NextFrame() - Increments the frame counter and adjusts the thrash
\r
1265 // avoidence variables
\r
1267 // If currently in panic mode (to avoid thrashing), check to see if the
\r
1268 // appropriate number of frames have passed since the last time that
\r
1269 // we would have thrashed. If so, take us out of panic mode.
\r
1273 PM_NextFrame(global_game_variables_t *gvar)
\r
1277 // Frame count overrun - kill the LRU hit entries & reset frame count
\r
1278 if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)
\r
1280 for (i = 0;i < gvar->pm.PMNumBlocks;i++)
\r
1281 gvar->pm.PMPages[i].lastHit = 0;
\r
1282 gvar->pm.PMFrameCount = 0;
\r
1286 for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)
\r
1288 if (gvar->pm.PMPages[i].locked)
\r
1291 sprintf(buf,"PM_NextFrame: Page %d is locked",i);
\r
1297 if (gvar->pm.PMPanicMode)
\r
1299 // DEBUG - set border color
\r
1300 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))
\r
1302 // DEBUG - reset border color
\r
1305 if (gvar->pm.PMThrashing >= PMThrashThreshold)
\r
1306 gvar->pm.PMPanicMode = PMUnThrashThreshold;
\r
1307 gvar->pm.PMThrashing = false;
\r
1311 // PM_Reset() - Sets up caching structures
\r
1314 PM_Reset(global_game_variables_t *gvar)
\r
1317 PageListStruct far *page;
\r
1319 gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;
\r
1321 gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);
\r
1322 gvar->pm.emm.EMSPhysicalPage = 0;
\r
1324 gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;
\r
1326 gvar->pm.PMPanicMode = false;
\r
1328 gvar->pm.fi.PageFile = -1;
\r
1329 gvar->pm.xmm.XMSProtectPage = -1;
\r
1331 // Initialize page list
\r
1332 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)
\r
1334 page->mainPage = -1;
\r
1335 page->emsPage = -1;
\r
1336 page->xmsPage = -1;
\r
1337 page->locked = false;
\r
1342 // PM_Startup() - Start up the Page Mgr
\r
1345 PM_Startup(global_game_variables_t *gvar)
\r
1347 boolean nomain,noems,noxms;
\r
1356 strcpy(&(gvar->pm.fi.PageFileName), "VSWAP.");
\r
1358 nomain = noems = noxms = false;
\r
1360 #ifdef __WATCOMC__
\r
1363 #ifdef __BORLANDC__
\r
1368 switch (US_CheckParm(
\r
1369 #ifdef __WATCOMC__
\r
1372 #ifdef __BORLANDC__
\r
1389 PML_OpenPageFile(gvar);
\r
1392 PML_StartupEMS(gvar);
\r
1394 PML_StartupXMS(gvar);
\r
1396 if (nomain && !EMSPresent)
\r
1398 Quit("PM_Startup: No main or EMS\n");
\r
1401 printf("PML_StartupMainMem\n");
\r
1402 PML_StartupMainMem(gvar);
\r
1410 // PM_Shutdown() - Shut down the Page Mgr
\r
1413 PM_Shutdown(global_game_variables_t *gvar)
\r
1415 PML_ShutdownXMS(gvar);
\r
1416 PML_ShutdownEMS(gvar);
\r
1421 PML_ClosePageFile(gvar);
\r
1423 PML_ShutdownMainMem(gvar);
\r