1 /* Project 16 Source Code~
\r
2 * Copyright (C) 2012-2016 sparky4 & pngwen & andrius4669 & joncampbell123 & yakui-lover
\r
4 * This file is part of Project 16.
\r
6 * Project 16 is free software; you can redistribute it and/or modify
\r
7 * it under the terms of the GNU General Public License as published by
\r
8 * the Free Software Foundation; either version 3 of the License, or
\r
9 * (at your option) any later version.
\r
11 * Project 16 is distributed in the hope that it will be useful,
\r
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
\r
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\r
14 * GNU General Public License for more details.
\r
16 * You should have received a copy of the GNU General Public License
\r
17 * along with this program. If not, see <http://www.gnu.org/licenses/>, or
\r
18 * write to the Free Software Foundation, Inc., 51 Franklin Street,
\r
19 * Fifth Floor, Boston, MA 02110-1301 USA.
\r
25 // Id Engine's Page Manager v1.0
\r
26 // Primary coder: Jason Blochowiak
\r
29 #include "src/lib/16_pm.h"
\r
33 boolean dbg_debugpm=0;
\r
36 // Main Mem specific variables
\r
37 //boolean MainPresent;
\r
38 /* memptr MainMemPages[PMMaxMainMem];
\r
39 PMBlockAttr gvar->pm.mm.MainMemUsed[PMMaxMainMem];
\r
40 int gvar->pm.mm.MainPagesAvail;*/
\r
42 // EMS specific variables
\r
43 //boolean EMSPresent;
\r
44 /* word gvar->pm.emm.EMSAvail,gvar->pm.emm.EMSPagesAvail,gvar->pm.emm.EMSHandle,
\r
45 gvar->pm.emm.EMSPageFrame,gvar->pm.emm.EMSPhysicalPage;
\r
46 gvar->pm.emm.EMSListStruct gvar->pm.emm.EMSList[EMSFrameCount];*/
\r
48 // XMS specific variables
\r
49 //boolean XMSPresent;
\r
50 //word gvar->pm.xmm.XMSAvail,gvar->pm.xmm.XMSPagesAvail,gvar->pm.xmm.XMSHandle;
\r
52 /* int gvar->pm.xmm.XMSProtectPage = -1;
\r
54 // File specific variables
\r
55 char gvar->pm.fi.PageFileName[13] = {"VSWAP."};
\r
57 word gvar->pm.fi.ChunksInFile;
\r
58 word PMSpriteStart,PMSoundStart;*/
\r
60 // General usage variables
\r
61 /* boolean PMStarted,
\r
62 gvar->pm.PMPanicMode,
\r
63 gvar->pm.PMThrashing;
\r
64 word gvar->pm.XMSPagesUsed,
\r
65 gvar->pm.EMSPagesUsed,
\r
67 gvar->pm.PMNumBlocks;
\r
69 PageListStruct far *gvar->pm.PMPages,
\r
70 _seg *gvar->pm.PMSegPages;*/
\r
72 static char *ParmStrings[] = {"nomain","noems","noxms",nil};
\r
74 /////////////////////////////////////////////////////////////////////////////
\r
76 // EMS Management code
\r
78 /////////////////////////////////////////////////////////////////////////////
\r
81 // PML_MapEMS() - Maps a logical page to a physical page
\r
84 PML_MapEMS(word logical, byte physical, global_game_variables_t *gvar)
\r
90 boolean errorflag=false;
\r
91 EMShandle=gvar->pm.emm.EMSHandle;
\r
102 #ifdef __BORLANDC__
\r
106 #ifdef __BORLANDC__
\r
111 #ifdef __BORLANDC__
\r
118 if(errorflag==true)
\r
120 strcpy(str,"MM_MapEMS: EMS error ");
\r
121 MM_EMSerr(str, err);
\r
122 printf("%s\n",str);
\r
123 Quit("PML_MapEMS: Page mapping failed\n");
\r
130 // PML_StartupEMS() - Sets up EMS for Page Mgr's use
\r
131 // Checks to see if EMS driver is present
\r
132 // Verifies that EMS hardware is present
\r
133 // Make sure that EMS version is 3.2 or later
\r
134 // If there's more than our minimum (2 pages) available, allocate it (up
\r
135 // to the maximum we need)
\r
139 PML_StartupEMS(global_game_variables_t *gvar)
\r
145 boolean errorflag=false;
\r
146 static char emmname[] = "EMMXXXX0"; //fix by andrius4669
\r
147 unsigned int EMSVer = 0;
\r
148 unsigned totalEMSpages,freeEMSpages,EMSPageFrame,EMSHandle,EMSAvail;
\r
149 totalEMSpages = freeEMSpages = EMSPageFrame = 0;
\r
150 gvar->pm.emm.EMSPresent = false; // Assume that we'll fail
\r
151 gvar->pm.emm.EMSAvail = 0;
\r
152 gvar->mmi.EMSmem = 0;
\r
155 mov dx,OFFSET emmname //fix by andrius4669
\r
157 int EMS_INT // try to open EMMXXXX0 device
\r
163 int EMS_INT // get device info
\r
171 int EMS_INT // get status
\r
177 int EMS_INT // close handle
\r
182 jc error1 // make sure EMS hardware is present
\r
185 int EMS_INT // only work on EMS 3.2 or greater (silly, but...)
\r
188 mov [EMSVer],ax // set EMSVer
\r
189 cmp al,0x32 // only work on ems 3.2 or greater
\r
192 mov ah,EMS_GETFRAME
\r
193 int EMS_INT // find the page frame address
\r
196 mov [EMSPageFrame],bx
\r
198 mov ah,EMS_GETPAGES
\r
199 int EMS_INT // find out how much EMS is there
\r
203 jz noEMS // no EMS at all to allocate
\r
205 jl noEMS // Require at least 2 pages (32k)
\r
206 mov [totalEMSpages],dx
\r
207 mov [freeEMSpages],bx
\r
210 #ifdef __BORLANDC__
\r
214 #ifdef __BORLANDC__
\r
220 #ifdef __BORLANDC__
\r
229 if(errorflag==false)
\r
231 // Don't hog all available EMS
\r
232 size = gvar->pm.emm.EMSAvail * (long)EMSPageSize;
\r
233 if (size - (EMSPageSize * 2) > (gvar->pm.fi.ChunksInFile * (long)PMPageSize))
\r
235 size = (gvar->pm.fi.ChunksInFile * (long)PMPageSize) + EMSPageSize;
\r
236 gvar->pm.emm.EMSAvail = size / EMSPageSize;
\r
241 mov ah,EMS_ALLOCPAGES
\r
248 #ifdef __BORLANDC__
\r
252 #ifdef __BORLANDC__
\r
258 #ifdef __BORLANDC__
\r
266 if(errorflag==false)
\r
268 gvar->mmi.EMSmem = EMSAvail * (dword)EMSPageSize;
\r
270 // Initialize EMS mapping cache
\r
271 for (i = 0;i < EMSFrameCount;i++)
\r
272 gvar->pm.emm.EMSList[i].baseEMSPage = -1;
\r
277 strcpy(str,"PML_StartupEMS: EMS error ");
\r
278 MM_EMSerr(str, err);
\r
279 printf("%s\n",str);
\r
280 return(gvar->pm.emm.EMSPresent);
\r
283 gvar->pm.emm.EMSPresent = true; // We have EMS
\r
284 gvar->pm.emm.EMSPageFrame = EMSPageFrame;
\r
285 gvar->pm.emm.EMSAvail = EMSAvail;
\r
286 gvar->pm.emm.EMSVer = EMSVer;
\r
287 gvar->pm.emm.EMSHandle = EMSHandle;
\r
288 gvar->pm.emm.freeEMSpages = freeEMSpages;
\r
289 gvar->pm.emm.totalEMSpages = totalEMSpages;
\r
291 return(gvar->pm.emm.EMSPresent);
\r
295 // PML_ShutdownEMS() - If EMS was used, deallocate it
\r
298 PML_ShutdownEMS(global_game_variables_t *gvar)
\r
303 boolean errorflag=false;
\r
304 EMSHandle=gvar->pm.emm.EMSHandle;
\r
306 if (gvar->pm.emm.EMSPresent)
\r
309 mov ah,EMS_FREEPAGES
\r
314 #ifdef __BORLANDC__
\r
318 #ifdef __BORLANDC__
\r
324 #ifdef __BORLANDC__
\r
331 if(errorflag==true)
\r
333 strcpy(str,"PML_ShutdownEMS: Error freeing EMS ");
\r
334 MM_EMSerr(str, err);
\r
335 printf("%s\n",str);
\r
336 Quit("PML_ShutdownEMS: Error freeing EMS\n");
\r
342 /////////////////////////////////////////////////////////////////////////////
\r
344 // XMS Management code
\r
346 /////////////////////////////////////////////////////////////////////////////
\r
349 // PML_StartupXMS() - Starts up XMS for the Page Mgr's use
\r
350 // Checks for presence of an XMS driver
\r
351 // Makes sure that there's at least a page of XMS available
\r
352 // Allocates any remaining XMS (rounded down to the nearest page size)
\r
355 PML_StartupXMS(global_game_variables_t *gvar)
\r
357 //#define STARTUPXMSASM
\r
359 #ifndef STARTUPXMSASM
\r
360 #define XMSAVI gvar->pm.xmm.XMSAvail
\r
361 #define XMSHAN gvar->pm.xmm.XMSHandle
\r
364 word XMSAvail, XMSHandle;
\r
365 #define XMSAVI XMSAvail
\r
366 #define XMSHAN XMSHandle
\r
368 //++++ word XMSVer;
\r
369 boolean errorflag=false;
\r
371 gvar->pm.xmm.XMSPresent = false; // Assume failure
\r
372 XMSAVI = gvar->mmi.XMSmem = 0;
\r
376 int XMS_INT // Check for presence of XMS driver
\r
382 int XMS_INT // Get address of XMS driver
\r
383 mov [WORD PTR XMSDriver],bx
\r
384 mov [WORD PTR XMSDriver+2],es // function pointer to XMS driver
\r
386 //++++ call [DWORD PTR XMSDriver] //; Get XMS Version Number
\r
387 //++++ mov [XMSVer],ax
\r
390 #ifdef STARTUPXMSASM
\r
391 mov ah,XMS_QUERYFREE // Find out how much XMS is available
\r
392 call [DWORD PTR XMSDriver]//DWORD PTR
\r
398 or ax,ax // AJR: bugfix 10/8/92
\r
403 #ifdef __BORLANDC__
\r
407 #ifdef __BORLANDC__
\r
413 #ifdef __BORLANDC__
\r
420 if(errorflag==true) goto error;
\r
421 #ifndef STARTUPXMSASM
\r
422 XMS_CALL(XMS_QUERYFREE); // Find out how much XMS is available
\r
424 if (!_AX) // AJR: bugfix 10/8/92
\r
433 #ifdef __DEBUG_PM__
\r
434 //++++ printf("XMSVer=%02X ", XMSVer);
\r
435 printf("XMSAvail=%u\n", XMSAVI);
\r
437 XMSAVI &= ~(PMPageSizeKB - 1); // Round off to nearest page size
\r
438 if (XMSAVI < (PMPageSizeKB * 2)) // Need at least 2 pages
\r
443 #ifdef STARTUPXMSASM
\r
450 mov ah,XMS_ALLOC // And do the allocation
\r
451 call [DWORD PTR XMSDriver]//DWORD PTR
\r
457 or ax,ax // AJR: bugfix 10/8/92
\r
461 #ifdef __BORLANDC__
\r
465 #ifdef __BORLANDC__
\r
471 #ifdef __BORLANDC__
\r
480 XMS_CALL(XMS_ALLOC); // And do the allocation
\r
482 if (!_AX) // AJR: bugfix 10/8/92
\r
491 if(errorflag==false)
\r
493 gvar->mmi.XMSmem = (dword)(XMSAVI) * 1024;
\r
494 #ifdef STARTUPXMSASM
\r
495 gvar->pm.xmm.XMSAvail = XMSAVI;
\r
496 gvar->pm.xmm.XMSHandle = XMSHAN;
\r
498 //++++ gvar->pm.xmm.XMSVer = XMSVer;
\r
499 gvar->pm.xmm.XMSPresent = true;
\r
500 #ifdef __DEBUG_PM__
\r
501 printf(" XMSmem=%lu XMSAvail=%u\n", gvar->mmi.XMSmem, XMSAVI);
\r
506 #ifdef __DEBUG_PM__
\r
507 //printf("XMSHandle\n");
\r
508 //printf(" 1=%u 2=%u 3=%u 4=%u\n", XMSHandle1, XMSHandle2, XMSHandle3, XMSHandle4);
\r
509 //printf(" 2=%u ", XMSHandle);
\r
510 //printf(" %u", gvar->pm.xmm.XMSHandle);
\r
511 printf("err=%02X e=%u\n", err, e);
\r
514 return(gvar->pm.xmm.XMSPresent);
\r
518 // PML_XMSCopy() - Copies a main/EMS page to or from XMS
\r
519 // Will round an odd-length request up to the next even value
\r
522 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)
\r
528 word source_handle;
\r
529 dword source_offset;
\r
530 word target_handle;
\r
531 dword target_offset;
\r
536 Quit("PML_XMSCopy: zero address\n");
\r
540 xoffset = (dword)xmspage * PMPageSize;
\r
542 copy.length = (length + 1) & ~1;
\r
543 copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;
\r
544 copy.source_offset = toxms? (long)addr : xoffset;
\r
545 copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;
\r
546 copy.target_offset = toxms? xoffset : (long)addr;
\r
552 XMS_CALL(XMS_MOVE);
\r
558 Quit("PML_XMSCopy: Error on copy");
\r
564 #define PML_CopyToXMS(s,t,l,gvar) PML_XMSCopy(true,(s),(t),(l),(gvar))
\r
565 #define PML_CopyFromXMS(t,s,l,gvar) PML_XMSCopy(false,(t),(s),(l),(gvar))
\r
568 // PML_CopyToXMS() - Copies the specified number of bytes from the real mode
\r
569 // segment address to the specified XMS page
\r
572 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)
\r
574 PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);
\r
578 // PML_CopyFromXMS() - Copies the specified number of bytes from an XMS
\r
579 // page to the specified real mode address
\r
582 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)
\r
584 PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);
\r
589 // PML_ShutdownXMS()
\r
592 PML_ShutdownXMS(global_game_variables_t *gvar)
\r
594 boolean errorflag=false;
\r
595 word XMSHandle = gvar->pm.xmm.XMSHandle;
\r
596 if (gvar->pm.xmm.XMSPresent)
\r
600 //XMS_CALL(XMS_FREE);
\r
602 call [DWORD PTR XMSDriver]
\r
606 #ifdef __BORLANDC__
\r
610 #ifdef __BORLANDC__
\r
616 #ifdef __BORLANDC__
\r
623 if(errorflag==true)
\r
625 Quit("PML_ShutdownXMS: Error freeing XMS");
\r
631 /////////////////////////////////////////////////////////////////////////////
\r
633 // Main memory code
\r
635 /////////////////////////////////////////////////////////////////////////////
\r
638 // PM_SetMainMemPurge() - Sets the purge level for all allocated main memory
\r
639 // blocks. This shouldn't be called directly - the PM_LockMainMem() and
\r
640 // PM_UnlockMainMem() macros should be used instead.
\r
643 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)
\r
647 if(gvar->pm.mm.MainPresent)
\r
648 for (i = 0;i < PMMaxMainMem;i++)
\r
650 #ifdef __DEBUG_PM__
\r
651 printf("PM_SetMainMemPurge() info of gvar->pm.mm.MainMemPages[i]\n");
\r
652 printf("& %Fp, %Fp\n", &gvar->pm.mm.MainMemPages[i], &(gvar->pm.mm.MainMemPages[i]));
\r
654 if (gvar->pm.mm.MainMemPages[i])
\r
655 MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);
\r
660 Quit("MainPresent IS NULL\n");
\r
665 // PM_CheckMainMem() - If something besides the Page Mgr makes requests of
\r
666 // the Memory Mgr, some of the Page Mgr's blocks may have been purged,
\r
667 // so this function runs through the block list and checks to see if
\r
668 // any of the blocks have been purged. If so, it marks the corresponding
\r
669 // page as purged & unlocked, then goes through the block list and
\r
670 // tries to reallocate any blocks that have been purged.
\r
671 // This routine now calls PM_LockMainMem() to make sure that any allocation
\r
672 // attempts made during the block reallocation sweep don't purge any
\r
673 // of the other blocks. Because PM_LockMainMem() is called,
\r
674 // PM_UnlockMainMem() needs to be called before any other part of the
\r
675 // program makes allocation requests of the Memory Mgr.
\r
678 PM_CheckMainMem(global_game_variables_t *gvar)
\r
680 boolean allocfailed;
\r
684 PageListStruct far *page;
\r
686 if (!gvar->pm.mm.MainPresent)
\r
689 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
691 n = page->mainPage;
\r
692 if (n != -1) // Is the page using main memory?
\r
694 if (!gvar->pm.mm.MainMemPages[n]) // Yep, was the block purged?
\r
696 page->mainPage = -1; // Yes, mark page as purged & unlocked
\r
697 page->locked = pml_Unlocked;
\r
702 // Prevent allocation attempts from purging any of our other blocks
\r
703 PM_LockMainMem(gvar);
\r
704 allocfailed = false;
\r
705 for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)
\r
707 if (!*p) // If the page got purged
\r
709 if (*used & pmba_Allocated) // If it was allocated
\r
711 *used &= ~pmba_Allocated; // Mark as unallocated
\r
712 gvar->pm.mm.MainPagesAvail--; // and decrease available count
\r
715 if (*used & pmba_Used) // If it was used
\r
717 *used &= ~pmba_Used; // Mark as unused
\r
718 gvar->pm.MainPagesUsed--; // and decrease used count
\r
723 MM_BombOnError(false, gvar);
\r
724 MM_GetPtr(p,PMPageSize, gvar); // Try to reallocate
\r
725 if (gvar->mm.mmerror) // If it failed,
\r
726 allocfailed = true; // don't try any more allocations
\r
727 else // If it worked,
\r
729 *used |= pmba_Allocated; // Mark as allocated
\r
730 gvar->pm.mm.MainPagesAvail++; // and increase available count
\r
732 MM_BombOnError(true, gvar);
\r
736 if (gvar->mm.mmerror)
\r
737 gvar->mm.mmerror = false;
\r
741 // PML_StartupMainMem() - Allocates as much main memory as is possible for
\r
742 // the Page Mgr. The memory is allocated as non-purgeable, so if it's
\r
743 // necessary to make requests of the Memory Mgr, PM_UnlockMainMem()
\r
744 // needs to be called.
\r
747 PML_StartupMainMem(global_game_variables_t *gvar)
\r
752 gvar->pm.mm.MainPagesAvail = 0;
\r
753 gvar->pm.mm.MainPresent = false;
\r
754 MM_BombOnError(false, gvar);
\r
755 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
\r
757 MM_GetPtr(p,PMPageSize, gvar);
\r
758 if (gvar->mm.mmerror)
\r
761 gvar->pm.mm.MainPagesAvail++;
\r
762 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;
\r
764 MM_BombOnError(true, gvar);
\r
765 if (gvar->mm.mmerror)
\r
766 gvar->mm.mmerror = false;
\r
767 if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)
\r
769 Quit("PM_SetupMainMem: Not enough main memory");
\r
772 gvar->pm.mm.MainPresent = true;
\r
776 // PML_ShutdownMainMem() - Frees all of the main memory blocks used by the
\r
780 PML_ShutdownMainMem(global_game_variables_t *gvar)
\r
785 // DEBUG - mark pages as unallocated & decrease page count as appropriate
\r
786 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
\r
788 MM_FreePtr(p, gvar);
\r
791 /////////////////////////////////////////////////////////////////////////////
\r
793 // File management code
\r
795 /////////////////////////////////////////////////////////////////////////////
\r
798 // PML_ReadFromFile() - Reads some data in from the page file
\r
801 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)
\r
805 Quit("PML_ReadFromFile: Null pointer");
\r
810 Quit("PML_ReadFromFile: Zero offset");
\r
813 if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)
\r
815 Quit("PML_ReadFromFile: Seek failed");
\r
818 if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))
\r
820 Quit("PML_ReadFromFile: Read failed");
\r
826 // PML_OpenPageFile() - Opens the page file and sets up the page info
\r
829 PML_OpenPageFile(global_game_variables_t *gvar)
\r
835 dword far *offsetptr;
\r
836 word far *lengthptr;
\r
837 PageListStruct far *page;
\r
839 gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);
\r
840 if (gvar->pm.fi.PageFile == -1)
\r
842 Quit("PML_OpenPageFile: Unable to open page file");
\r
846 // Read in header variables
\r
847 read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));
\r
848 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));
\r
849 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));
\r
851 // Allocate and clear the page list
\r
852 gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;
\r
853 MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);
\r
854 MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);
\r
855 gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;
\r
856 _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);
\r
858 // Read in the chunk offsets
\r
859 size = sizeof(dword) * gvar->pm.fi.ChunksInFile;
\r
860 MM_GetPtr(&buf, size, gvar);
\r
861 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
\r
863 Quit("PML_OpenPageFile: Offset read failed");
\r
866 offsetptr = (dword far *)buf;
\r
867 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
868 page->offset = *offsetptr++;
\r
869 MM_FreePtr(&buf, gvar);
\r
871 // Read in the chunk lengths
\r
872 size = sizeof(word) * gvar->pm.fi.ChunksInFile;
\r
873 MM_GetPtr(&buf,size, gvar);
\r
874 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
\r
876 Quit("PML_OpenPageFile: Length read failed");
\r
879 lengthptr = (word far *)buf;
\r
880 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
881 page->length = *lengthptr++;
\r
882 MM_FreePtr(&buf, gvar);
\r
886 // PML_ClosePageFile() - Closes the page file
\r
889 PML_ClosePageFile(global_game_variables_t *gvar)
\r
891 if (gvar->pm.fi.PageFile != -1)
\r
892 close(gvar->pm.fi.PageFile);
\r
893 if (gvar->pm.PMSegPages)
\r
895 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);
\r
896 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);
\r
900 /////////////////////////////////////////////////////////////////////////////
\r
902 // Allocation, etc., code
\r
904 /////////////////////////////////////////////////////////////////////////////
\r
907 // PML_GetEMSAddress()
\r
909 // Page is in EMS, so figure out which EMS physical page should be used
\r
910 // to map our page in. If normal page, use EMS physical page 3, else
\r
911 // use the physical page specified by the lock type
\r
913 #ifndef __DEBUG_2__
\r
914 #pragma argsused // DEBUG - remove lock parameter
\r
916 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
\r
919 word emsoff,emsbase,offset;
\r
921 emsoff = page & (PMEMSSubPage - 1);
\r
922 emsbase = page - emsoff;
\r
925 // See if this page is already mapped in
\r
926 for (i = 0;i < EMSFrameCount;i++)
\r
928 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)
\r
930 emspage = i; // Yep - don't do a redundant remapping
\r
935 // If page isn't already mapped in, find LRU EMS frame, and use it
\r
938 dword last = LONG_MAX;
\r
939 for (i = 0;i < EMSFrameCount;i++)
\r
941 if (gvar->pm.emm.EMSList[i].lastHit < last)
\r
944 last = gvar->pm.emm.EMSList[i].lastHit;
\r
948 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;
\r
949 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);
\r
953 Quit("PML_GetEMSAddress: EMS find failed");
\r
955 gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;
\r
956 offset = emspage * EMSPageSizeSeg;
\r
957 offset += emsoff * PMPageSizeSeg;
\r
958 return((memptr)(gvar->pm.emm.EMSPageFrame + offset));
\r
962 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
\r
966 emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);
\r
968 PML_MapEMS(page / PMEMSSubPage,emspage);
\r
970 return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)
\r
971 + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));
\r
976 // PM_GetPageAddress() - Returns the address of a given page
\r
977 // Maps in EMS if necessary
\r
978 // Returns nil if block isn't cached into Main Memory or EMS
\r
982 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)
\r
984 PageListStruct far *page;
\r
986 page = &gvar->pm.PMPages[pagenum];
\r
987 if (page->mainPage != -1)
\r
988 return(gvar->pm.mm.MainMemPages[page->mainPage]);
\r
989 else if (page->emsPage != -1)
\r
990 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));
\r
996 // PML_GiveLRUPage() - Returns the page # of the least recently used
\r
997 // present & unlocked main/EMS page (or main page if mainonly is true)
\r
1000 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)
\r
1004 PageListStruct far *page;
\r
1006 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
1010 (page->lastHit < last)
\r
1011 && ((page->emsPage != -1) || (page->mainPage != -1))
\r
1012 && (page->locked == pml_Unlocked)
\r
1013 && (!(mainonly && (page->mainPage == -1)))
\r
1016 last = page->lastHit;
\r
1022 Quit("PML_GiveLRUPage: LRU Search failed");
\r
1027 // PML_GiveLRUXMSPage() - Returns the page # of the least recently used
\r
1028 // (and present) XMS page.
\r
1029 // This routine won't return the XMS page protected (by XMSProtectPage)
\r
1032 PML_GiveLRUXMSPage(global_game_variables_t *gvar)
\r
1036 PageListStruct far *page;
\r
1038 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
1042 (page->xmsPage != -1)
\r
1043 && (page->lastHit < last)
\r
1044 && (i != gvar->pm.xmm.XMSProtectPage)
\r
1047 last = page->lastHit;
\r
1055 // PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace
\r
1056 // it with the main/EMS page
\r
1059 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)
\r
1062 PageListStruct far *page;
\r
1064 if (!gvar->pm.xmm.XMSPresent)
\r
1067 page = &gvar->pm.PMPages[pagenum];
\r
1068 if (page->xmsPage != -1)
\r
1069 return; // Already in XMS
\r
1071 if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)
\r
1072 page->xmsPage = gvar->pm.XMSPagesUsed++;
\r
1075 usexms = PML_GiveLRUXMSPage(gvar);
\r
1077 Quit("PML_PutPageInXMS: No XMS LRU");
\r
1078 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;
\r
1079 gvar->pm.PMPages[usexms].xmsPage = -1;
\r
1081 PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);
\r
1085 // PML_TransferPageSpace() - A page is being replaced, so give the new page
\r
1086 // the old one's address space. Returns the address of the new page.
\r
1089 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)
\r
1092 PageListStruct far *origpage,far *newpage;
\r
1095 Quit("PML_TransferPageSpace: Identity replacement");
\r
1097 origpage = &gvar->pm.PMPages[orig];
\r
1098 newpage = &gvar->pm.PMPages[new];
\r
1100 if (origpage->locked != pml_Unlocked)
\r
1101 Quit("PML_TransferPageSpace: Killing locked page");
\r
1103 if ((origpage->emsPage == -1) && (origpage->mainPage == -1))
\r
1104 Quit("PML_TransferPageSpace: Reusing non-existent page");
\r
1106 // Copy page that's about to be purged into XMS
\r
1107 PML_PutPageInXMS(orig, gvar);
\r
1109 // Get the address, and force EMS into a physical page if necessary
\r
1110 addr = PM_GetPageAddress(orig, gvar);
\r
1112 // Steal the address
\r
1113 newpage->emsPage = origpage->emsPage;
\r
1114 newpage->mainPage = origpage->mainPage;
\r
1116 // Mark replaced page as purged
\r
1117 origpage->mainPage = origpage->emsPage = -1;
\r
1120 Quit("PML_TransferPageSpace: Zero replacement");
\r
1126 // PML_GetAPageBuffer() - A page buffer is needed. Either get it from the
\r
1127 // main/EMS free pool, or use PML_GiveLRUPage() to find which page to
\r
1128 // steal the buffer from. Returns a far pointer to the page buffer, and
\r
1129 // sets the fields inside the given page structure appropriately.
\r
1130 // If mainonly is true, free EMS will be ignored, and only main pages
\r
1131 // will be looked at by PML_GiveLRUPage().
\r
1134 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1136 byte far *addr = nil;
\r
1138 PMBlockAttr *used;
\r
1139 PageListStruct far *page;
\r
1141 page = &gvar->pm.PMPages[pagenum];
\r
1142 if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)
\r
1144 // There's remaining EMS - use it
\r
1145 page->emsPage = gvar->pm.EMSPagesUsed++;
\r
1146 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);
\r
1148 else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)
\r
1150 // There's remaining main memory - use it
\r
1151 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)
\r
1153 if ((*used & pmba_Allocated) && !(*used & pmba_Used))
\r
1156 *used |= pmba_Used;
\r
1161 Quit("PML_GetPageBuffer: MainPagesAvail lied");
\r
1162 addr = gvar->pm.mm.MainMemPages[n];
\r
1164 Quit("PML_GetPageBuffer: Purged main block");
\r
1165 page->mainPage = n;
\r
1166 gvar->pm.MainPagesUsed++;
\r
1169 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);
\r
1172 Quit("PML_GetPageBuffer: Search failed");
\r
1177 // PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and
\r
1178 // replace it with the page from XMS. If mainonly is true, will only
\r
1179 // search for LRU main page.
\r
1180 // XMSProtectPage is set to the page to be retrieved from XMS, so that if
\r
1181 // the page from which we're stealing the main/EMS from isn't in XMS,
\r
1182 // it won't copy over the page that we're trying to get from XMS.
\r
1183 // (pages that are being purged are copied into XMS, if possible)
\r
1186 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1188 byte far *checkaddr;
\r
1189 memptr addr = nil;
\r
1190 PageListStruct far *page;
\r
1192 page = &gvar->pm.PMPages[pagenum];
\r
1193 if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))
\r
1195 gvar->pm.xmm.XMSProtectPage = pagenum;
\r
1196 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
1197 if (FP_OFF(checkaddr))
\r
1198 Quit("PML_GetPageFromXMS: Non segment pointer");
\r
1199 addr = (memptr)FP_SEG(checkaddr);
\r
1200 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);
\r
1201 gvar->pm.xmm.XMSProtectPage = -1;
\r
1208 // PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.
\r
1209 // Load it into either main or EMS. If mainonly is true, the page will
\r
1210 // only be loaded into main.
\r
1213 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
1216 PageListStruct far *page;
\r
1218 addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
1219 page = &gvar->pm.PMPages[pagenum];
\r
1220 PML_ReadFromFile(addr,page->offset,page->length, gvar);
\r
1224 // PM_GetPage() - Returns the address of the page, loading it if necessary
\r
1225 // First, check if in Main Memory or EMS
\r
1226 // Then, check XMS
\r
1227 // If not in XMS, load into Main Memory or EMS
\r
1231 PM_GetPage(int pagenum, global_game_variables_t *gvar)
\r
1235 if (pagenum >= gvar->pm.fi.ChunksInFile)
\r
1236 Quit("PM_GetPage: Invalid page request");
\r
1238 #ifdef __DEBUG_2__ // for debugging
\r
1240 mov dx,STATUS_REGISTER_1
\r
1243 mov al,ATR_OVERSCAN
\r
1245 mov al,10 // bright green
\r
1250 if (!(result = PM_GetPageAddress(pagenum, gvar)))
\r
1252 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);
\r
1253 if (!gvar->pm.PMPages[pagenum].offset) // JDC: sparse page
\r
1254 Quit ("Tried to load a sparse page!");
\r
1255 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))
\r
1257 if (gvar->pm.PMPages[pagenum].lastHit == gvar->pm.PMFrameCount)
\r
1258 gvar->pm.PMThrashing++;
\r
1260 PML_LoadPage(pagenum,mainonly, gvar);
\r
1261 result = PM_GetPageAddress(pagenum, gvar);
\r
1264 gvar->pm.PMPages[pagenum].lastHit = gvar->pm.PMFrameCount;
\r
1266 #ifdef __DEBUG_2__ // for debugging
\r
1268 mov dx,STATUS_REGISTER_1
\r
1271 mov al,ATR_OVERSCAN
\r
1275 mov al,0x20 // normal
\r
1284 // PM_SetPageLock() - Sets the lock type on a given page
\r
1285 // pml_Unlocked: Normal, page can be purged
\r
1286 // pml_Locked: Cannot be purged
\r
1287 // pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page
\r
1288 // specified when returning the address. For sound stuff.
\r
1291 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)
\r
1293 if (pagenum < gvar->pm.fi.PMSoundStart)
\r
1294 Quit("PM_SetPageLock: Locking/unlocking non-sound page");
\r
1296 gvar->pm.PMPages[pagenum].locked = lock;
\r
1300 // PM_Preload() - Loads as many pages as possible into all types of memory.
\r
1301 // Calls the update function after each load, indicating the current
\r
1302 // page, and the total pages that need to be loaded (for thermometer).
\r
1305 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)
\r
1309 word current,total,
\r
1310 totalnonxms,totalxms,
\r
1311 mainfree,maintotal,
\r
1315 PageListStruct far *p;
\r
1317 mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);
\r
1318 xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);
\r
1320 xmstotal = maintotal = 0;
\r
1322 for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)
\r
1324 if (!gvar->pm.PMPages[i].offset)
\r
1325 continue; // sparse
\r
1327 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )
\r
1328 continue; // already in main mem
\r
1335 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )
\r
1343 total = maintotal + xmstotal;
\r
1352 // cache main/ems blocks
\r
1356 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1
\r
1357 || gvar->pm.PMPages[page].emsPage != -1 )
\r
1360 if (page >= gvar->pm.fi.ChunksInFile)
\r
1361 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1363 PM_GetPage(page, gvar);
\r
1368 update(current,total);
\r
1372 // load stuff to XMS
\r
1376 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)
\r
1378 addr = PM_GetPage(oogypage, gvar);
\r
1380 Quit("PM_Preload: XMS buffer failed");
\r
1384 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )
\r
1387 if (page >= gvar->pm.fi.ChunksInFile)
\r
1388 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1390 p = &gvar->pm.PMPages[page];
\r
1392 p->xmsPage = gvar->pm.XMSPagesUsed++;
\r
1393 if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)
\r
1394 Quit("PM_Preload: Exceeded XMS pages");
\r
1395 if (p->length > PMPageSize)
\r
1396 Quit("PM_Preload: Page too long");
\r
1398 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1399 PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);
\r
1404 update(current,total);
\r
1407 p = &gvar->pm.PMPages[oogypage];
\r
1408 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1411 update(total,total);
\r
1414 /////////////////////////////////////////////////////////////////////////////
\r
1418 /////////////////////////////////////////////////////////////////////////////
\r
1421 // PM_NextFrame() - Increments the frame counter and adjusts the thrash
\r
1422 // avoidence variables
\r
1424 // If currently in panic mode (to avoid thrashing), check to see if the
\r
1425 // appropriate number of frames have passed since the last time that
\r
1426 // we would have thrashed. If so, take us out of panic mode.
\r
1430 PM_NextFrame(global_game_variables_t *gvar)
\r
1434 // Frame count overrun - kill the LRU hit entries & reset frame count
\r
1435 if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)
\r
1437 for (i = 0;i < gvar->pm.PMNumBlocks;i++)
\r
1438 gvar->pm.PMPages[i].lastHit = 0;
\r
1439 gvar->pm.PMFrameCount = 0;
\r
1443 for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)
\r
1445 if (gvar->pm.PMPages[i].locked)
\r
1448 sprintf(buf,"PM_NextFrame: Page %d is locked",i);
\r
1454 if (gvar->pm.PMPanicMode)
\r
1456 // DEBUG - set border color
\r
1457 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))
\r
1459 // DEBUG - reset border color
\r
1462 if (gvar->pm.PMThrashing >= PMThrashThreshold)
\r
1463 gvar->pm.PMPanicMode = PMUnThrashThreshold;
\r
1464 gvar->pm.PMThrashing = false;
\r
1468 // PM_Reset() - Sets up caching structures
\r
1471 PM_Reset(global_game_variables_t *gvar)
\r
1474 PageListStruct far *page;
\r
1476 gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;
\r
1478 gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);
\r
1479 gvar->pm.emm.EMSPhysicalPage = 0;
\r
1481 gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;
\r
1483 gvar->pm.PMPanicMode = false;
\r
1485 gvar->pm.fi.PageFile = -1;
\r
1486 gvar->pm.xmm.XMSProtectPage = -1;
\r
1488 // Initialize page list
\r
1489 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)
\r
1491 page->mainPage = -1;
\r
1492 page->emsPage = -1;
\r
1493 page->xmsPage = -1;
\r
1494 page->locked = false;
\r
1499 // PM_Startup() - Start up the Page Mgr
\r
1502 PM_Startup(global_game_variables_t *gvar)
\r
1504 boolean nomain,noems,noxms;
\r
1507 if (gvar->pm.PMStarted)
\r
1510 //strcpy(&(gvar->pm.fi.PageFileName), "VSWAP.");
\r
1512 nomain = noems = noxms = false;
\r
1514 #ifdef __WATCOMC__
\r
1517 #ifdef __BORLANDC__
\r
1522 switch (US_CheckParm(
\r
1523 #ifdef __WATCOMC__
\r
1526 #ifdef __BORLANDC__
\r
1543 //0000+=+=PML_OpenPageFile(gvar);
\r
1545 if (!noems && MML_CheckForEMS())
\r
1546 PML_StartupEMS(gvar);
\r
1547 if (!noxms && MML_CheckForXMS())
\r
1548 PML_StartupXMS(gvar);
\r
1550 PML_StartupMainMem(gvar);
\r
1552 if (!gvar->pm.mm.MainPresent && !gvar->pm.emm.EMSPresent && !gvar->pm.xmm.XMSPresent)
\r
1554 Quit("PM_Startup: No main or EMS\n");
\r
1560 gvar->pm.PMStarted = true;
\r
1564 // PM_Shutdown() - Shut down the Page Mgr
\r
1567 PM_Shutdown(global_game_variables_t *gvar)
\r
1569 if(MML_CheckForXMS()) PML_ShutdownXMS(gvar);
\r
1570 if(MML_CheckForEMS()) PML_ShutdownEMS(gvar);
\r
1572 if (!gvar->pm.PMStarted)
\r
1575 PML_ClosePageFile(gvar);
\r
1577 PML_ShutdownMainMem(gvar);
\r