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 // Main Mem specific variables
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34 boolean MainPresent;
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35 memptr MainMemPages[PMMaxMainMem];
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36 PMBlockAttr gvar->pm.mm.MainMemUsed[PMMaxMainMem];
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37 int gvar->pm.mm.MainPagesAvail;
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39 // EMS specific variables
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40 boolean gvar->pm.emm.EMSPresent;
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41 word gvar->pm.emm.EMSAvail,gvar->pm.emm.EMSPagesAvail,gvar->pm.emm.EMSHandle,
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42 gvar->pm.emm.EMSPageFrame,gvar->pm.emm.EMSPhysicalPage;
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43 gvar->pm.emm.EMSListStruct gvar->pm.emm.EMSList[EMSFrameCount];
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45 // XMS specific variables
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46 boolean gvar->pm.xmm.XMSPresent;
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47 word gvar->pm.xmm.XMSAvail,gvar->pm.xmm.XMSPagesAvail,gvar->pm.xmm.XMSHandle;*/
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49 /* int gvar->pm.xmm.XMSProtectPage = -1;
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51 // File specific variables
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52 char gvar->pm.fi.PageFileName[13] = {"VSWAP."};
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54 word gvar->pm.fi.ChunksInFile;
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55 word PMSpriteStart,PMSoundStart;
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57 // General usage variables
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59 gvar->pm.PMPanicMode,
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60 gvar->pm.PMThrashing;
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61 word gvar->pm.XMSPagesUsed,
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62 gvar->pm.EMSPagesUsed,
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64 gvar->pm.PMNumBlocks;
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66 PageListStruct far *gvar->pm.PMPages,
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67 _seg *gvar->pm.PMSegPages;
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69 static char *ParmStrings[] = {"nomain","noems","noxms",nil};
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71 /////////////////////////////////////////////////////////////////////////////
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73 // EMS Management code
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75 /////////////////////////////////////////////////////////////////////////////
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78 // PML_MapEMS() - Maps a logical page to a physical page
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81 PML_MapEMS(word logical, byte physical, global_game_variables_t *gvar)
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86 boolean errorflag=false;
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88 EMShandle=gvar->pm.emm.EMSHandle;
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103 #ifdef __BORLANDC__
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108 #ifdef __BORLANDC__
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115 if(errorflag==true)
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117 strcpy(str,"MM_MapEMS: EMS error ");
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118 MM_EMSerr(str, err);
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119 printf("%s\n",str);
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120 Quit("PML_MapEMS: Page mapping failed\n");
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127 // PML_StartupEMS() - Sets up EMS for Page Mgr's use
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128 // Checks to see if EMS driver is present
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129 // Verifies that EMS hardware is present
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130 // Make sure that EMS version is 3.2 or later
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131 // If there's more than our minimum (2 pages) available, allocate it (up
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132 // to the maximum we need)
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135 char EMMDriverName[9] = "EMMXXXX0";
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138 PML_StartupEMS(global_game_variables_t *gvar)
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144 gvar->pm.emm.EMSPresent = false; // Assume that we'll fail
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145 gvar->pm.emm.EMSAvail = 0;
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148 _DX = (word)EMMDriverName;
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150 geninterrupt(0x21); // try to open EMMXXXX0 device
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154 #ifdef __BORLANDC__
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167 geninterrupt(0x21); // get device info
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171 #ifdef __BORLANDC__
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187 geninterrupt(0x21); // get status
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193 #ifdef __BORLANDC__
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204 geninterrupt(0x21); // close handle
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207 geninterrupt(EMS_INT);
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209 goto error; // make sure EMS hardware is present
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212 geninterrupt(EMS_INT);
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213 if (_AH || (_AL < 0x32)) // only work on EMS 3.2 or greater (silly, but...)
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216 _AH = EMS_GETFRAME;
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217 geninterrupt(EMS_INT);
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219 goto error; // find the page frame address
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220 gvar->pm.emm.EMSPageFrame = _BX;
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222 _AH = EMS_GETPAGES;
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223 geninterrupt(EMS_INT);
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227 goto error; // Require at least 2 pages (32k)
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228 gvar->pm.emm.EMSAvail = _BX;
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230 // Don't hog all available EMS
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231 size = gvar->pm.emm.EMSAvail * (long)EMSPageSize;
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232 if (size - (EMSPageSize * 2) > (gvar->pm.fi.ChunksInFile * (long)PMPageSize))
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234 size = (gvar->pm.fi.ChunksInFile * (long)PMPageSize) + EMSPageSize;
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235 gvar->pm.emm.EMSAvail = size / EMSPageSize;
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238 _AH = EMS_ALLOCPAGES;
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239 _BX = gvar->pm.emm.EMSAvail;
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240 geninterrupt(EMS_INT);
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243 gvar->pm.emm.EMSHandle = _DX;
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245 gvar->mmi.EMSmem += gvar->pm.emm.EMSAvail * (long)EMSPageSize;
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247 // Initialize EMS mapping cache
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248 for (i = 0;i < EMSFrameCount;i++)
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249 gvar->pm.emm.EMSList[i].baseEMSPage = -1;
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251 gvar->pm.emm.EMSPresent = true; // We have EMS
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254 return(gvar->pm.emm.EMSPresent);
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258 // PML_ShutdownEMS() - If EMS was used, deallocate it
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261 PML_ShutdownEMS(global_game_variables_t *gvar)
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264 EMSHandle=gvar->pm.emm.EMSHandle;
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266 if (gvar->pm.emm.EMSPresent)
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269 mov ah,EMS_FREEPAGES
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275 Quit("PML_ShutdownEMS: Error freeing EMS\n");
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281 /////////////////////////////////////////////////////////////////////////////
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283 // XMS Management code
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285 /////////////////////////////////////////////////////////////////////////////
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288 // PML_StartupXMS() - Starts up XMS for the Page Mgr's use
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289 // Checks for presence of an XMS driver
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290 // Makes sure that there's at least a page of XMS available
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291 // Allocates any remaining XMS (rounded down to the nearest page size)
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294 PML_StartupXMS(global_game_variables_t *gvar)
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296 gvar->pm.xmm.XMSPresent = false; // Assume failure
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297 gvar->pm.xmm.XMSAvail = 0;
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300 geninterrupt(XMS_INT); // Check for presence of XMS driver
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307 int XMS_INT // Get address of XMS driver
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308 mov [WORD PTR XMSDriver],bx
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309 mov [WORD PTR XMSDriver+2],es // function pointer to XMS driver
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312 XMS_CALL(XMS_QUERYFREE); // Find out how much XMS is available
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313 gvar->pm.xmm.XMSAvail = _AX;
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314 if (!_AX) // AJR: bugfix 10/8/92
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317 gvar->pm.xmm.XMSAvail &= ~(PMPageSizeKB - 1); // Round off to nearest page size
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318 if (gvar->pm.xmm.XMSAvail < (PMPageSizeKB * 2)) // Need at least 2 pages
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321 _DX = gvar->pm.xmm.XMSAvail;
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322 XMS_CALL(XMS_ALLOC); // And do the allocation
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323 gvar->pm.xmm.XMSHandle = _DX;
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325 if (!_AX) // AJR: bugfix 10/8/92
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327 gvar->pm.xmm.XMSAvail = 0;
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331 gvar->mmi.XMSmem += gvar->pm.xmm.XMSAvail * 1024;
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333 gvar->pm.xmm.XMSPresent = true;
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335 return(gvar->pm.xmm.XMSPresent);
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339 // PML_XMSCopy() - Copies a main/EMS page to or from XMS
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340 // Will round an odd-length request up to the next even value
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343 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)
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349 word source_handle;
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350 dword source_offset;
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351 word target_handle;
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352 dword target_offset;
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357 Quit("PML_XMSCopy: zero address\n");
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361 xoffset = (dword)xmspage * PMPageSize;
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363 copy.length = (length + 1) & ~1;
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364 copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;
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365 copy.source_offset = toxms? (long)addr : xoffset;
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366 copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;
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367 copy.target_offset = toxms? xoffset : (long)addr;
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373 XMS_CALL(XMS_MOVE);
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379 Quit("PML_XMSCopy: Error on copy");
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385 #define PML_CopyToXMS(s,t,l,gvar) PML_XMSCopy(true,(s),(t),(l),(gvar))
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386 #define PML_CopyFromXMS(t,s,l,gvar) PML_XMSCopy(false,(t),(s),(l),(gvar))
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389 // PML_CopyToXMS() - Copies the specified number of bytes from the real mode
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390 // segment address to the specified XMS page
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393 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)
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395 PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);
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399 // PML_CopyFromXMS() - Copies the specified number of bytes from an XMS
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400 // page to the specified real mode address
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403 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)
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405 PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);
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410 // PML_ShutdownXMS()
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413 PML_ShutdownXMS(global_game_variables_t *gvar)
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415 if (gvar->pm.xmm.XMSPresent)
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417 _DX = gvar->pm.xmm.XMSHandle;
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418 XMS_CALL(XMS_FREE);
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421 Quit("PML_ShutdownXMS: Error freeing XMS");
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427 /////////////////////////////////////////////////////////////////////////////
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429 // Main memory code
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431 /////////////////////////////////////////////////////////////////////////////
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434 // PM_SetMainMemPurge() - Sets the purge level for all allocated main memory
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435 // blocks. This shouldn't be called directly - the PM_LockMainMem() and
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436 // PM_UnlockMainMem() macros should be used instead.
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439 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)
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443 for (i = 0;i < PMMaxMainMem;i++)
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445 #ifdef __DEBUG_PM__
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446 printf("PM_SetMainMemPurge() info of gvar->pm.mm.MainMemPages[i]\n");
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447 printf(" %Fp, %Fp\n", gvar->pm.mm.MainMemPages[i], (gvar->pm.mm.MainMemPages[i]));
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448 printf("& %Fp, %Fp\n", &gvar->pm.mm.MainMemPages[i], &(gvar->pm.mm.MainMemPages[i]));
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450 if (gvar->pm.mm.MainMemPages[i])
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451 MM_SetPurge((gvar->pm.mm.MainMemPages[i]),level, gvar);
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456 // PM_CheckMainMem() - If something besides the Page Mgr makes requests of
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457 // the Memory Mgr, some of the Page Mgr's blocks may have been purged,
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458 // so this function runs through the block list and checks to see if
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459 // any of the blocks have been purged. If so, it marks the corresponding
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460 // page as purged & unlocked, then goes through the block list and
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461 // tries to reallocate any blocks that have been purged.
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462 // This routine now calls PM_LockMainMem() to make sure that any allocation
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463 // attempts made during the block reallocation sweep don't purge any
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464 // of the other blocks. Because PM_LockMainMem() is called,
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465 // PM_UnlockMainMem() needs to be called before any other part of the
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466 // program makes allocation requests of the Memory Mgr.
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469 PM_CheckMainMem(global_game_variables_t *gvar)
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471 boolean allocfailed;
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475 PageListStruct far *page;
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477 if (!gvar->pm.mm.MainPresent)
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480 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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482 n = page->mainPage;
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483 if (n != -1) // Is the page using main memory?
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485 if (!gvar->pm.mm.MainMemPages[n]) // Yep, was the block purged?
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487 page->mainPage = -1; // Yes, mark page as purged & unlocked
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488 page->locked = pml_Unlocked;
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493 // Prevent allocation attempts from purging any of our other blocks
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494 PM_LockMainMem(gvar);
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495 allocfailed = false;
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496 for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)
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498 if (!*p) // If the page got purged
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500 if (*used & pmba_Allocated) // If it was allocated
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502 *used &= ~pmba_Allocated; // Mark as unallocated
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503 gvar->pm.mm.MainPagesAvail--; // and decrease available count
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506 if (*used & pmba_Used) // If it was used
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508 *used &= ~pmba_Used; // Mark as unused
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509 gvar->pm.MainPagesUsed--; // and decrease used count
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514 MM_BombOnError(false, gvar);
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515 MM_GetPtr(p,PMPageSize, gvar); // Try to reallocate
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516 if (gvar->mm.mmerror) // If it failed,
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517 allocfailed = true; // don't try any more allocations
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518 else // If it worked,
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520 *used |= pmba_Allocated; // Mark as allocated
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521 gvar->pm.mm.MainPagesAvail++; // and increase available count
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523 MM_BombOnError(true, gvar);
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527 if (gvar->mm.mmerror)
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528 gvar->mm.mmerror = false;
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532 // PML_StartupMainMem() - Allocates as much main memory as is possible for
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533 // the Page Mgr. The memory is allocated as non-purgeable, so if it's
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534 // necessary to make requests of the Memory Mgr, PM_UnlockMainMem()
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535 // needs to be called.
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538 PML_StartupMainMem(global_game_variables_t *gvar)
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543 gvar->pm.mm.MainPagesAvail = 0;
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544 MM_BombOnError(false, gvar);
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545 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
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547 MM_GetPtr(p,PMPageSize, gvar);
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548 if (gvar->mm.mmerror)
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551 gvar->pm.mm.MainPagesAvail++;
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552 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;
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554 MM_BombOnError(true, gvar);
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555 if (gvar->mm.mmerror)
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556 gvar->mm.mmerror = false;
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557 if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)
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559 Quit("PM_SetupMainMem: Not enough main memory");
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562 gvar->pm.mm.MainPresent = true;
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566 // PML_ShutdownMainMem() - Frees all of the main memory blocks used by the
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570 PML_ShutdownMainMem(global_game_variables_t *gvar)
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575 // DEBUG - mark pages as unallocated & decrease page count as appropriate
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576 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
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578 MM_FreePtr(p, gvar);
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581 /////////////////////////////////////////////////////////////////////////////
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583 // File management code
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585 /////////////////////////////////////////////////////////////////////////////
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588 // PML_ReadFromFile() - Reads some data in from the page file
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591 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)
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595 Quit("PML_ReadFromFile: Null pointer");
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600 Quit("PML_ReadFromFile: Zero offset");
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603 if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)
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605 Quit("PML_ReadFromFile: Seek failed");
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608 if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))
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610 Quit("PML_ReadFromFile: Read failed");
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616 // PML_OpenPageFile() - Opens the page file and sets up the page info
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619 PML_OpenPageFile(global_game_variables_t *gvar)
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625 dword far *offsetptr;
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626 word far *lengthptr;
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627 PageListStruct far *page;
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629 gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);
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630 if (gvar->pm.fi.PageFile == -1)
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632 Quit("PML_OpenPageFile: Unable to open page file");
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636 // Read in header variables
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637 read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));
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638 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));
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639 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));
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641 // Allocate and clear the page list
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642 gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;
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643 MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);
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644 MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);
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645 gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;
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646 _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);
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648 // Read in the chunk offsets
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649 size = sizeof(dword) * gvar->pm.fi.ChunksInFile;
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650 MM_GetPtr(&buf, size, gvar);
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651 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
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653 Quit("PML_OpenPageFile: Offset read failed");
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656 offsetptr = (dword far *)buf;
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657 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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658 page->offset = *offsetptr++;
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659 MM_FreePtr(&buf, gvar);
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661 // Read in the chunk lengths
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662 size = sizeof(word) * gvar->pm.fi.ChunksInFile;
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663 MM_GetPtr(&buf,size, gvar);
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664 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
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666 Quit("PML_OpenPageFile: Length read failed");
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669 lengthptr = (word far *)buf;
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670 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
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671 page->length = *lengthptr++;
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672 MM_FreePtr(&buf, gvar);
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676 // PML_ClosePageFile() - Closes the page file
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679 PML_ClosePageFile(global_game_variables_t *gvar)
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681 if (gvar->pm.fi.PageFile != -1)
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682 close(gvar->pm.fi.PageFile);
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683 if (gvar->pm.PMSegPages)
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685 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);
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686 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);
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690 /////////////////////////////////////////////////////////////////////////////
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692 // Allocation, etc., code
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694 /////////////////////////////////////////////////////////////////////////////
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697 // PML_GetEMSAddress()
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699 // Page is in EMS, so figure out which EMS physical page should be used
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700 // to map our page in. If normal page, use EMS physical page 3, else
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701 // use the physical page specified by the lock type
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703 #ifndef __DEBUG_2__
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704 #pragma argsused // DEBUG - remove lock parameter
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706 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
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709 word emsoff,emsbase,offset;
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711 emsoff = page & (PMEMSSubPage - 1);
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712 emsbase = page - emsoff;
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715 // See if this page is already mapped in
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716 for (i = 0;i < EMSFrameCount;i++)
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718 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)
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720 emspage = i; // Yep - don't do a redundant remapping
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725 // If page isn't already mapped in, find LRU EMS frame, and use it
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728 dword last = LONG_MAX;
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729 for (i = 0;i < EMSFrameCount;i++)
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731 if (gvar->pm.emm.EMSList[i].lastHit < last)
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734 last = gvar->pm.emm.EMSList[i].lastHit;
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738 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;
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739 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);
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743 Quit("PML_GetEMSAddress: EMS find failed");
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745 gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;
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746 offset = emspage * EMSPageSizeSeg;
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747 offset += emsoff * PMPageSizeSeg;
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748 return((memptr)(gvar->pm.emm.EMSPageFrame + offset));
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752 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
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756 emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);
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758 PML_MapEMS(page / PMEMSSubPage,emspage);
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760 return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)
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761 + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));
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766 // PM_GetPageAddress() - Returns the address of a given page
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767 // Maps in EMS if necessary
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768 // Returns nil if block isn't cached into Main Memory or EMS
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772 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)
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774 PageListStruct far *page;
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776 page = &gvar->pm.PMPages[pagenum];
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777 if (page->mainPage != -1)
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778 return(gvar->pm.mm.MainMemPages[page->mainPage]);
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779 else if (page->emsPage != -1)
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780 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));
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786 // PML_GiveLRUPage() - Returns the page # of the least recently used
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787 // present & unlocked main/EMS page (or main page if mainonly is true)
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790 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)
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794 PageListStruct far *page;
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796 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
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800 (page->lastHit < last)
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801 && ((page->emsPage != -1) || (page->mainPage != -1))
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802 && (page->locked == pml_Unlocked)
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803 && (!(mainonly && (page->mainPage == -1)))
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806 last = page->lastHit;
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812 Quit("PML_GiveLRUPage: LRU Search failed");
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817 // PML_GiveLRUXMSPage() - Returns the page # of the least recently used
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818 // (and present) XMS page.
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819 // This routine won't return the XMS page protected (by XMSProtectPage)
\r
822 PML_GiveLRUXMSPage(global_game_variables_t *gvar)
\r
826 PageListStruct far *page;
\r
828 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
832 (page->xmsPage != -1)
\r
833 && (page->lastHit < last)
\r
834 && (i != gvar->pm.xmm.XMSProtectPage)
\r
837 last = page->lastHit;
\r
845 // PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace
\r
846 // it with the main/EMS page
\r
849 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)
\r
852 PageListStruct far *page;
\r
854 if (!gvar->pm.xmm.XMSPresent)
\r
857 page = &gvar->pm.PMPages[pagenum];
\r
858 if (page->xmsPage != -1)
\r
859 return; // Already in XMS
\r
861 if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)
\r
862 page->xmsPage = gvar->pm.XMSPagesUsed++;
\r
865 usexms = PML_GiveLRUXMSPage(gvar);
\r
867 Quit("PML_PutPageInXMS: No XMS LRU");
\r
868 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;
\r
869 gvar->pm.PMPages[usexms].xmsPage = -1;
\r
871 PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);
\r
875 // PML_TransferPageSpace() - A page is being replaced, so give the new page
\r
876 // the old one's address space. Returns the address of the new page.
\r
879 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)
\r
882 PageListStruct far *origpage,far *newpage;
\r
885 Quit("PML_TransferPageSpace: Identity replacement");
\r
887 origpage = &gvar->pm.PMPages[orig];
\r
888 newpage = &gvar->pm.PMPages[new];
\r
890 if (origpage->locked != pml_Unlocked)
\r
891 Quit("PML_TransferPageSpace: Killing locked page");
\r
893 if ((origpage->emsPage == -1) && (origpage->mainPage == -1))
\r
894 Quit("PML_TransferPageSpace: Reusing non-existent page");
\r
896 // Copy page that's about to be purged into XMS
\r
897 PML_PutPageInXMS(orig, gvar);
\r
899 // Get the address, and force EMS into a physical page if necessary
\r
900 addr = PM_GetPageAddress(orig, gvar);
\r
902 // Steal the address
\r
903 newpage->emsPage = origpage->emsPage;
\r
904 newpage->mainPage = origpage->mainPage;
\r
906 // Mark replaced page as purged
\r
907 origpage->mainPage = origpage->emsPage = -1;
\r
910 Quit("PML_TransferPageSpace: Zero replacement");
\r
916 // PML_GetAPageBuffer() - A page buffer is needed. Either get it from the
\r
917 // main/EMS free pool, or use PML_GiveLRUPage() to find which page to
\r
918 // steal the buffer from. Returns a far pointer to the page buffer, and
\r
919 // sets the fields inside the given page structure appropriately.
\r
920 // If mainonly is true, free EMS will be ignored, and only main pages
\r
921 // will be looked at by PML_GiveLRUPage().
\r
924 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
926 byte far *addr = nil;
\r
929 PageListStruct far *page;
\r
931 page = &gvar->pm.PMPages[pagenum];
\r
932 if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)
\r
934 // There's remaining EMS - use it
\r
935 page->emsPage = gvar->pm.EMSPagesUsed++;
\r
936 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);
\r
938 else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)
\r
940 // There's remaining main memory - use it
\r
941 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)
\r
943 if ((*used & pmba_Allocated) && !(*used & pmba_Used))
\r
946 *used |= pmba_Used;
\r
951 Quit("PML_GetPageBuffer: MainPagesAvail lied");
\r
952 addr = gvar->pm.mm.MainMemPages[n];
\r
954 Quit("PML_GetPageBuffer: Purged main block");
\r
955 page->mainPage = n;
\r
956 gvar->pm.MainPagesUsed++;
\r
959 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);
\r
962 Quit("PML_GetPageBuffer: Search failed");
\r
967 // PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and
\r
968 // replace it with the page from XMS. If mainonly is true, will only
\r
969 // search for LRU main page.
\r
970 // XMSProtectPage is set to the page to be retrieved from XMS, so that if
\r
971 // the page from which we're stealing the main/EMS from isn't in XMS,
\r
972 // it won't copy over the page that we're trying to get from XMS.
\r
973 // (pages that are being purged are copied into XMS, if possible)
\r
976 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
978 byte far *checkaddr;
\r
980 PageListStruct far *page;
\r
982 page = &gvar->pm.PMPages[pagenum];
\r
983 if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))
\r
985 gvar->pm.xmm.XMSProtectPage = pagenum;
\r
986 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
987 if (FP_OFF(checkaddr))
\r
988 Quit("PML_GetPageFromXMS: Non segment pointer");
\r
989 addr = (memptr)FP_SEG(checkaddr);
\r
990 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);
\r
991 gvar->pm.xmm.XMSProtectPage = -1;
\r
998 // PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.
\r
999 // Load it into either main or EMS. If mainonly is true, the page will
\r
1000 // only be loaded into main.
\r
1003 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1006 PageListStruct far *page;
\r
1008 addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
1009 page = &gvar->pm.PMPages[pagenum];
\r
1010 PML_ReadFromFile(addr,page->offset,page->length, gvar);
\r
1014 // PM_GetPage() - Returns the address of the page, loading it if necessary
\r
1015 // First, check if in Main Memory or EMS
\r
1016 // Then, check XMS
\r
1017 // If not in XMS, load into Main Memory or EMS
\r
1021 PM_GetPage(int pagenum, global_game_variables_t *gvar)
\r
1025 if (pagenum >= gvar->pm.fi.ChunksInFile)
\r
1026 Quit("PM_GetPage: Invalid page request");
\r
1028 #ifdef __DEBUG_2__ // for debugging
\r
1030 mov dx,STATUS_REGISTER_1
\r
1033 mov al,ATR_OVERSCAN
\r
1035 mov al,10 // bright green
\r
1040 if (!(result = PM_GetPageAddress(pagenum, gvar)))
\r
1042 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);
\r
1043 if (!gvar->pm.PMPages[pagenum].offset) // JDC: sparse page
\r
1044 Quit ("Tried to load a sparse page!");
\r
1045 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))
\r
1047 if (gvar->pm.PMPages[pagenum].lastHit == gvar->pm.PMFrameCount)
\r
1048 gvar->pm.PMThrashing++;
\r
1050 PML_LoadPage(pagenum,mainonly, gvar);
\r
1051 result = PM_GetPageAddress(pagenum, gvar);
\r
1054 gvar->pm.PMPages[pagenum].lastHit = gvar->pm.PMFrameCount;
\r
1056 #ifdef __DEBUG_2__ // for debugging
\r
1058 mov dx,STATUS_REGISTER_1
\r
1061 mov al,ATR_OVERSCAN
\r
1065 mov al,0x20 // normal
\r
1074 // PM_SetPageLock() - Sets the lock type on a given page
\r
1075 // pml_Unlocked: Normal, page can be purged
\r
1076 // pml_Locked: Cannot be purged
\r
1077 // pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page
\r
1078 // specified when returning the address. For sound stuff.
\r
1081 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)
\r
1083 if (pagenum < gvar->pm.fi.PMSoundStart)
\r
1084 Quit("PM_SetPageLock: Locking/unlocking non-sound page");
\r
1086 gvar->pm.PMPages[pagenum].locked = lock;
\r
1090 // PM_Preload() - Loads as many pages as possible into all types of memory.
\r
1091 // Calls the update function after each load, indicating the current
\r
1092 // page, and the total pages that need to be loaded (for thermometer).
\r
1095 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)
\r
1099 word current,total,
\r
1100 totalnonxms,totalxms,
\r
1101 mainfree,maintotal,
\r
1105 PageListStruct far *p;
\r
1107 mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);
\r
1108 xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);
\r
1110 xmstotal = maintotal = 0;
\r
1112 for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)
\r
1114 if (!gvar->pm.PMPages[i].offset)
\r
1115 continue; // sparse
\r
1117 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )
\r
1118 continue; // already in main mem
\r
1125 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )
\r
1133 total = maintotal + xmstotal;
\r
1142 // cache main/ems blocks
\r
1146 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1
\r
1147 || gvar->pm.PMPages[page].emsPage != -1 )
\r
1150 if (page >= gvar->pm.fi.ChunksInFile)
\r
1151 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1153 PM_GetPage(page, gvar);
\r
1158 update(current,total);
\r
1162 // load stuff to XMS
\r
1166 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)
\r
1168 addr = PM_GetPage(oogypage, gvar);
\r
1170 Quit("PM_Preload: XMS buffer failed");
\r
1174 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )
\r
1177 if (page >= gvar->pm.fi.ChunksInFile)
\r
1178 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1180 p = &gvar->pm.PMPages[page];
\r
1182 p->xmsPage = gvar->pm.XMSPagesUsed++;
\r
1183 if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)
\r
1184 Quit("PM_Preload: Exceeded XMS pages");
\r
1185 if (p->length > PMPageSize)
\r
1186 Quit("PM_Preload: Page too long");
\r
1188 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1189 PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);
\r
1194 update(current,total);
\r
1197 p = &gvar->pm.PMPages[oogypage];
\r
1198 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1201 update(total,total);
\r
1204 /////////////////////////////////////////////////////////////////////////////
\r
1208 /////////////////////////////////////////////////////////////////////////////
\r
1211 // PM_NextFrame() - Increments the frame counter and adjusts the thrash
\r
1212 // avoidence variables
\r
1214 // If currently in panic mode (to avoid thrashing), check to see if the
\r
1215 // appropriate number of frames have passed since the last time that
\r
1216 // we would have thrashed. If so, take us out of panic mode.
\r
1220 PM_NextFrame(global_game_variables_t *gvar)
\r
1224 // Frame count overrun - kill the LRU hit entries & reset frame count
\r
1225 if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)
\r
1227 for (i = 0;i < gvar->pm.PMNumBlocks;i++)
\r
1228 gvar->pm.PMPages[i].lastHit = 0;
\r
1229 gvar->pm.PMFrameCount = 0;
\r
1233 for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)
\r
1235 if (gvar->pm.PMPages[i].locked)
\r
1238 sprintf(buf,"PM_NextFrame: Page %d is locked",i);
\r
1244 if (gvar->pm.PMPanicMode)
\r
1246 // DEBUG - set border color
\r
1247 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))
\r
1249 // DEBUG - reset border color
\r
1252 if (gvar->pm.PMThrashing >= PMThrashThreshold)
\r
1253 gvar->pm.PMPanicMode = PMUnThrashThreshold;
\r
1254 gvar->pm.PMThrashing = false;
\r
1258 // PM_Reset() - Sets up caching structures
\r
1261 PM_Reset(global_game_variables_t *gvar)
\r
1264 PageListStruct far *page;
\r
1266 gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;
\r
1268 gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);
\r
1269 gvar->pm.emm.EMSPhysicalPage = 0;
\r
1271 gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;
\r
1273 gvar->pm.PMPanicMode = false;
\r
1275 gvar->pm.fi.PageFile = -1;
\r
1276 gvar->pm.xmm.XMSProtectPage = -1;
\r
1278 // Initialize page list
\r
1279 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)
\r
1281 page->mainPage = -1;
\r
1282 page->emsPage = -1;
\r
1283 page->xmsPage = -1;
\r
1284 page->locked = false;
\r
1289 // PM_Startup() - Start up the Page Mgr
\r
1292 PM_Startup(global_game_variables_t *gvar)
\r
1294 boolean nomain,noems,noxms;
\r
1297 if (gvar->pm.PMStarted)
\r
1300 strcat(&(gvar->pm.fi.PageFileName), "VSWAP.");
\r
1302 nomain = noems = noxms = false;
\r
1304 #ifdef __WATCOMC__
\r
1307 #ifdef __BORLANDC__
\r
1312 switch (US_CheckParm(
\r
1313 #ifdef __WATCOMC__
\r
1316 #ifdef __BORLANDC__
\r
1333 PML_OpenPageFile(gvar);
\r
1336 PML_StartupEMS(gvar);
\r
1338 PML_StartupXMS(gvar);
\r
1340 if (nomain && !gvar->pm.emm.EMSPresent)
\r
1342 Quit("PM_Startup: No main or EMS\n");
\r
1346 PML_StartupMainMem(gvar);
\r
1350 gvar->pm.PMStarted = true;
\r
1354 // PM_Shutdown() - Shut down the Page Mgr
\r
1357 PM_Shutdown(global_game_variables_t *gvar)
\r
1359 PML_ShutdownXMS(gvar);
\r
1360 PML_ShutdownEMS(gvar);
\r
1362 if (!gvar->pm.PMStarted)
\r
1365 PML_ClosePageFile(gvar);
\r
1367 PML_ShutdownMainMem(gvar);
\r