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 // Main Mem specific variables
\r
34 boolean MainPresent;
\r
35 memptr MainMemPages[PMMaxMainMem];
\r
36 PMBlockAttr gvar->pm.mm.MainMemUsed[PMMaxMainMem];
\r
37 int gvar->pm.mm.MainPagesAvail;
\r
39 // EMS specific variables
\r
40 boolean gvar->pm.emm.EMSPresent;
\r
41 word gvar->pm.emm.EMSAvail,gvar->pm.emm.EMSPagesAvail,gvar->pm.emm.EMSHandle,
\r
42 gvar->pm.emm.EMSPageFrame,gvar->pm.emm.EMSPhysicalPage;
\r
43 gvar->pm.emm.EMSListStruct gvar->pm.emm.EMSList[EMSFrameCount];
\r
45 // XMS specific variables
\r
46 boolean gvar->pm.xmm.XMSPresent;
\r
47 word gvar->pm.xmm.XMSAvail,gvar->pm.xmm.XMSPagesAvail,gvar->pm.xmm.XMSHandle;
\r
49 int gvar->pm.xmm.XMSProtectPage = -1;
\r
51 // File specific variables
\r
52 char gvar->pm.fi.PageFileName[13] = {"VSWAP."};
\r
54 word gvar->pm.fi.ChunksInFile;
\r
55 word PMSpriteStart,PMSoundStart;
\r
57 // General usage variables
\r
59 gvar->pm.PMPanicMode,
\r
60 gvar->pm.PMThrashing;
\r
61 word gvar->pm.XMSPagesUsed,
\r
62 gvar->pm.EMSPagesUsed,
\r
64 gvar->pm.PMNumBlocks;
\r
66 PageListStruct far *gvar->pm.PMPages,
\r
67 _seg *gvar->pm.PMSegPages;
\r
69 static char *ParmStrings[] = {"nomain","noems","noxms",nil};
\r
71 /////////////////////////////////////////////////////////////////////////////
\r
73 // EMS Management code
\r
75 /////////////////////////////////////////////////////////////////////////////
\r
78 // PML_MapEMS() - Maps a logical page to a physical page
\r
81 PML_MapEMS(word logical, word physical, global_game_variables_t *gvar)
\r
84 CPURegs.h.al = physical;
\r
85 CPURegs.x.bx = logical;
\r
86 CPURegs.x.dx = gvar->pm.emm.EMSHandle;
\r
87 CPURegs.h.ah = EMS_MAPPAGE;
\r
94 Quit("PML_MapEMS: Page mapping failed\n");
\r
100 // PML_StartupEMS() - Sets up EMS for Page Mgr's use
\r
101 // Checks to see if EMS driver is present
\r
102 // Verifies that EMS hardware is present
\r
103 // Make sure that EMS version is 3.2 or later
\r
104 // If there's more than our minimum (2 pages) available, allocate it (up
\r
105 // to the maximum we need)
\r
108 char EMMDriverName[9] = "EMMXXXX0";
\r
111 PML_StartupEMS(global_game_variables_t *gvar)
\r
114 union REGS CPURegs;
\r
119 gvar->pm.emm.EMSPresent = false; // Assume that we'll fail
\r
120 gvar->pm.emm.EMSAvail = 0;
\r
124 //CPURegs.x.dx = (word)EMMDriverName;
\r
125 //CPURegs.x.ax = 0x3d00;
\r
126 //geninterrupt(0x21); // try to open EMMXXXX0 device
\r
127 mov dx,OFFSET EMMDriverName
\r
129 int 0x21 // try to open EMMXXXX0 device
\r
134 #ifdef __BORLANDC__
\r
139 #ifdef __BORLANDC__
\r
142 //CPURegs.x.bx = CPURegs.x.ax;
\r
143 //CPURegs.x.ax = 0x4400;
\r
144 //geninterrupt(0x21); // get device info
\r
147 int 0x21 // get device info
\r
152 #ifdef __BORLANDC__
\r
157 #ifndef __BORLANDC__
\r
160 if(emmcfems!=0) goto error;
\r
165 CPURegs.x.ax = 0x4407;
\r
166 geninterrupt(0x21); // get status
\r
167 __asm mov emmcfems,1
\r
168 if(emmcfems!=0) goto error;
\r
173 CPURegs.h.ah = 0x3e;
\r
174 geninterrupt(0x21); // close handle
\r
176 CPURegs.h.ah = EMS_STATUS;
\r
177 geninterrupt(EMS_INT);
\r
179 goto error; // make sure EMS hardware is present
\r
181 CPURegs.h.ah = EMS_VERSION;
\r
182 geninterrupt(EMS_INT);
\r
183 if (CPURegs.h.ah || (CPURegs.h.al < 0x32)) // only work on EMS 3.2 or greater (silly, but...)
\r
186 CPURegs.h.ah = EMS_GETFRAME;
\r
187 geninterrupt(EMS_INT);
\r
189 goto error; // find the page frame address
\r
190 gvar->pm.emm.EMSPageFrame = CPURegs.x.bx;
\r
192 CPURegs.h.ah = EMS_GETPAGES;
\r
193 geninterrupt(EMS_INT);
\r
196 if (CPURegs.x.bx < 2)
\r
197 goto error; // Require at least 2 pages (32k)
\r
198 gvar->pm.emm.EMSAvail = CPURegs.x.bx;
\r
200 // Don't hog all available EMS
\r
201 size = gvar->pm.emm.EMSAvail * (long)EMSPageSize;
\r
202 if (size - (EMSPageSize * 2) > (gvar->pm.fi.ChunksInFile * (long)PMPageSize))
\r
204 size = (gvar->pm.fi.ChunksInFile * (long)PMPageSize) + EMSPageSize;
\r
205 gvar->pm.emm.EMSAvail = size / EMSPageSize;
\r
208 CPURegs.h.ah = EMS_ALLOCPAGES;
\r
209 CPURegs.x.bx = gvar->pm.emm.EMSAvail;
\r
210 geninterrupt(EMS_INT);
\r
213 gvar->pm.emm.EMSHandle = CPURegs.x.dx;
\r
215 gvar->mmi.EMSmem += gvar->pm.emm.EMSAvail * (long)EMSPageSize;
\r
217 // Initialize EMS mapping cache
\r
218 for (i = 0;i < EMSFrameCount;i++)
\r
219 gvar->pm.emm.EMSList[i].baseEMSPage = -1;
\r
221 gvar->pm.emm.EMSPresent = true; // We have EMS
\r
224 return(gvar->pm.emm.EMSPresent);
\r
228 // PML_ShutdownEMS() - If EMS was used, deallocate it
\r
231 PML_ShutdownEMS(global_game_variables_t *gvar)
\r
233 union REGS CPURegs;
\r
235 if (gvar->pm.emm.EMSPresent)
\r
237 CPURegs.h.ah=EMS_FREEPAGES;
\r
238 CPURegs.x.ax=gvar->pm.emm.EMSHandle;
\r
239 geninterrupt(EMS_INT);
\r
242 Quit("PML_ShutdownEMS: Error freeing EMS\n");
\r
248 /////////////////////////////////////////////////////////////////////////////
\r
250 // XMS Management code
\r
252 /////////////////////////////////////////////////////////////////////////////
\r
255 // PML_StartupXMS() - Starts up XMS for the Page Mgr's use
\r
256 // Checks for presence of an XMS driver
\r
257 // Makes sure that there's at least a page of XMS available
\r
258 // Allocates any remaining XMS (rounded down to the nearest page size)
\r
261 PML_StartupXMS(global_game_variables_t *gvar)
\r
263 union REGS CPURegs;
\r
266 gvar->pm.xmm.XMSPresent = false; // Assume failure
\r
267 gvar->pm.xmm.XMSAvail = 0;
\r
269 CPURegs.x.ax=0x4300;
\r
270 geninterrupt(XMS_INT); // Check for presence of XMS driver
\r
271 if (CPURegs.h.al != 0x80)
\r
277 int XMS_INT // Get address of XMS driver
\r
278 mov [WORD PTR XMSDriver],bx
\r
279 mov [WORD PTR XMSDriver+2],es // function pointer to XMS driver
\r
282 XMS_CALL(XMS_QUERYFREE, gvar); // Find out how much XMS is available
\r
283 gvar->pm.xmm.XMSAvail = CPURegs.x.ax;
\r
284 if (!CPURegs.x.ax) // AJR: bugfix 10/8/92
\r
287 gvar->pm.xmm.XMSAvail &= ~(PMPageSizeKB - 1); // Round off to nearest page size
\r
288 if (gvar->pm.xmm.XMSAvail < (PMPageSizeKB * 2)) // Need at least 2 pages
\r
291 CPURegs.x.dx = gvar->pm.xmm.XMSAvail;
\r
292 XMS_CALL(XMS_ALLOC, gvar); // And do the allocation
\r
293 gvar->pm.xmm.XMSHandle = CPURegs.x.dx;
\r
295 if (!CPURegs.x.ax) // AJR: bugfix 10/8/92
\r
297 gvar->pm.xmm.XMSAvail = 0;
\r
301 gvar->mmi.XMSmem += gvar->pm.xmm.XMSAvail * 1024;
\r
303 gvar->pm.xmm.XMSPresent = true;
\r
305 return(gvar->pm.xmm.XMSPresent);
\r
309 // PML_XMSCopy() - Copies a main/EMS page to or from XMS
\r
310 // Will round an odd-length request up to the next even value
\r
313 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)
\r
320 word source_handle;
\r
321 dword source_offset;
\r
322 word target_handle;
\r
323 dword target_offset;
\r
328 Quit("PML_XMSCopy: zero address\n");
\r
332 xoffset = (dword)xmspage * PMPageSize;
\r
334 copy.length = (length + 1) & ~1;
\r
335 copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;
\r
336 copy.source_offset = toxms? (long)addr : xoffset;
\r
337 copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;
\r
338 copy.target_offset = toxms? xoffset : (long)addr;
\r
343 CPURegs.x.si = (word)©
\r
344 XMS_CALL(XMS_MOVE, gvar);
\r
350 Quit("PML_XMSCopy: Error on copy");
\r
356 #define PML_CopyToXMS(s,t,l,gvar) PML_XMSCopy(true,(s),(t),(l),(gvar))
\r
357 #define PML_CopyFromXMS(t,s,l,gvar) PML_XMSCopy(false,(t),(s),(l),(gvar))
\r
360 // PML_CopyToXMS() - Copies the specified number of bytes from the real mode
\r
361 // segment address to the specified XMS page
\r
364 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)
\r
366 PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);
\r
370 // PML_CopyFromXMS() - Copies the specified number of bytes from an XMS
\r
371 // page to the specified real mode address
\r
374 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)
\r
376 PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);
\r
381 // PML_ShutdownXMS()
\r
384 PML_ShutdownXMS(global_game_variables_t *gvar)
\r
387 if (gvar->pm.xmm.XMSPresent)
\r
389 CPURegs.x.dx = gvar->pm.xmm.XMSHandle;
\r
390 XMS_CALL(XMS_FREE, gvar);
\r
393 Quit("PML_ShutdownXMS: Error freeing XMS");
\r
399 /////////////////////////////////////////////////////////////////////////////
\r
401 // Main memory code
\r
403 /////////////////////////////////////////////////////////////////////////////
\r
406 // PM_SetMainMemPurge() - Sets the purge level for all allocated main memory
\r
407 // blocks. This shouldn't be called directly - the PM_LockMainMem() and
\r
408 // PM_UnlockMainMem() macros should be used instead.
\r
411 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)
\r
415 for (i = 0;i < PMMaxMainMem;i++)
\r
416 if (gvar->pm.mm.MainMemPages[i])
\r
417 MM_SetPurge(&gvar->pm.mm.MainMemPages[i],level, gvar);
\r
421 // PM_CheckMainMem() - If something besides the Page Mgr makes requests of
\r
422 // the Memory Mgr, some of the Page Mgr's blocks may have been purged,
\r
423 // so this function runs through the block list and checks to see if
\r
424 // any of the blocks have been purged. If so, it marks the corresponding
\r
425 // page as purged & unlocked, then goes through the block list and
\r
426 // tries to reallocate any blocks that have been purged.
\r
427 // This routine now calls PM_LockMainMem() to make sure that any allocation
\r
428 // attempts made during the block reallocation sweep don't purge any
\r
429 // of the other blocks. Because PM_LockMainMem() is called,
\r
430 // PM_UnlockMainMem() needs to be called before any other part of the
\r
431 // program makes allocation requests of the Memory Mgr.
\r
434 PM_CheckMainMem(global_game_variables_t *gvar)
\r
436 boolean allocfailed;
\r
440 PageListStruct far *page;
\r
442 if (!gvar->pm.mm.MainPresent)
\r
445 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
447 n = page->mainPage;
\r
448 if (n != -1) // Is the page using main memory?
\r
450 if (!gvar->pm.mm.MainMemPages[n]) // Yep, was the block purged?
\r
452 page->mainPage = -1; // Yes, mark page as purged & unlocked
\r
453 page->locked = pml_Unlocked;
\r
458 // Prevent allocation attempts from purging any of our other blocks
\r
459 PM_LockMainMem(gvar);
\r
460 allocfailed = false;
\r
461 for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)
\r
463 if (!*p) // If the page got purged
\r
465 if (*used & pmba_Allocated) // If it was allocated
\r
467 *used &= ~pmba_Allocated; // Mark as unallocated
\r
468 gvar->pm.mm.MainPagesAvail--; // and decrease available count
\r
471 if (*used & pmba_Used) // If it was used
\r
473 *used &= ~pmba_Used; // Mark as unused
\r
474 gvar->pm.MainPagesUsed--; // and decrease used count
\r
479 MM_BombOnError(false, gvar);
\r
480 MM_GetPtr(p,PMPageSize, gvar); // Try to reallocate
\r
481 if (gvar->mm.mmerror) // If it failed,
\r
482 allocfailed = true; // don't try any more allocations
\r
483 else // If it worked,
\r
485 *used |= pmba_Allocated; // Mark as allocated
\r
486 gvar->pm.mm.MainPagesAvail++; // and increase available count
\r
488 MM_BombOnError(true, gvar);
\r
492 if (gvar->mm.mmerror)
\r
493 gvar->mm.mmerror = false;
\r
497 // PML_StartupMainMem() - Allocates as much main memory as is possible for
\r
498 // the Page Mgr. The memory is allocated as non-purgeable, so if it's
\r
499 // necessary to make requests of the Memory Mgr, PM_UnlockMainMem()
\r
500 // needs to be called.
\r
503 PML_StartupMainMem(global_game_variables_t *gvar)
\r
508 gvar->pm.mm.MainPagesAvail = 0;
\r
509 MM_BombOnError(false, gvar);
\r
510 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
\r
512 MM_GetPtr(p,PMPageSize, gvar);
\r
513 if (gvar->mm.mmerror)
\r
516 gvar->pm.mm.MainPagesAvail++;
\r
517 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;
\r
519 MM_BombOnError(true, gvar);
\r
520 if (gvar->mm.mmerror)
\r
521 gvar->mm.mmerror = false;
\r
522 if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)
\r
524 Quit("PM_SetupMainMem: Not enough main memory");
\r
527 gvar->pm.mm.MainPresent = true;
\r
531 // PML_ShutdownMainMem() - Frees all of the main memory blocks used by the
\r
535 PML_ShutdownMainMem(global_game_variables_t *gvar)
\r
540 // DEBUG - mark pages as unallocated & decrease page count as appropriate
\r
541 for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)
\r
543 MM_FreePtr(p, gvar);
\r
546 /////////////////////////////////////////////////////////////////////////////
\r
548 // File management code
\r
550 /////////////////////////////////////////////////////////////////////////////
\r
553 // PML_ReadFromFile() - Reads some data in from the page file
\r
556 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)
\r
560 Quit("PML_ReadFromFile: Null pointer");
\r
565 Quit("PML_ReadFromFile: Zero offset");
\r
568 if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)
\r
570 Quit("PML_ReadFromFile: Seek failed");
\r
573 if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))
\r
575 Quit("PML_ReadFromFile: Read failed");
\r
581 // PML_OpenPageFile() - Opens the page file and sets up the page info
\r
584 PML_OpenPageFile(global_game_variables_t *gvar)
\r
590 dword far *offsetptr;
\r
591 word far *lengthptr;
\r
592 PageListStruct far *page;
\r
594 gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);
\r
595 if (gvar->pm.fi.PageFile == -1)
\r
597 Quit("PML_OpenPageFile: Unable to open page file");
\r
601 // Read in header variables
\r
602 read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));
\r
603 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));
\r
604 read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));
\r
606 // Allocate and clear the page list
\r
607 gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;
\r
608 MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);
\r
609 MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);
\r
610 gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;
\r
611 _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);
\r
613 // Read in the chunk offsets
\r
614 size = sizeof(dword) * gvar->pm.fi.ChunksInFile;
\r
615 MM_GetPtr(&buf, size, gvar);
\r
616 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
\r
618 Quit("PML_OpenPageFile: Offset read failed");
\r
621 offsetptr = (dword far *)buf;
\r
622 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
623 page->offset = *offsetptr++;
\r
624 MM_FreePtr(&buf, gvar);
\r
626 // Read in the chunk lengths
\r
627 size = sizeof(word) * gvar->pm.fi.ChunksInFile;
\r
628 MM_GetPtr(&buf,size, gvar);
\r
629 if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))
\r
631 Quit("PML_OpenPageFile: Length read failed");
\r
634 lengthptr = (word far *)buf;
\r
635 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
636 page->length = *lengthptr++;
\r
637 MM_FreePtr(&buf, gvar);
\r
641 // PML_ClosePageFile() - Closes the page file
\r
644 PML_ClosePageFile(global_game_variables_t *gvar)
\r
646 if (gvar->pm.fi.PageFile != -1)
\r
647 close(gvar->pm.fi.PageFile);
\r
648 if (gvar->pm.PMSegPages)
\r
650 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);
\r
651 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);
\r
655 /////////////////////////////////////////////////////////////////////////////
\r
657 // Allocation, etc., code
\r
659 /////////////////////////////////////////////////////////////////////////////
\r
662 // PML_GetEMSAddress()
\r
664 // Page is in EMS, so figure out which EMS physical page should be used
\r
665 // to map our page in. If normal page, use EMS physical page 3, else
\r
666 // use the physical page specified by the lock type
\r
668 #ifndef __DEBUG_2__
\r
669 #pragma argsused // DEBUG - remove lock parameter
\r
671 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
\r
674 word emsoff,emsbase,offset;
\r
676 emsoff = page & (PMEMSSubPage - 1);
\r
677 emsbase = page - emsoff;
\r
680 // See if this page is already mapped in
\r
681 for (i = 0;i < EMSFrameCount;i++)
\r
683 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)
\r
685 emspage = i; // Yep - don't do a redundant remapping
\r
690 // If page isn't already mapped in, find LRU EMS frame, and use it
\r
693 dword last = LONG_MAX;
\r
694 for (i = 0;i < EMSFrameCount;i++)
\r
696 if (gvar->pm.emm.EMSList[i].lastHit < last)
\r
699 last = gvar->pm.emm.EMSList[i].lastHit;
\r
703 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;
\r
704 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);
\r
708 Quit("PML_GetEMSAddress: EMS find failed");
\r
710 gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;
\r
711 offset = emspage * EMSPageSizeSeg;
\r
712 offset += emsoff * PMPageSizeSeg;
\r
713 return((memptr)(gvar->pm.emm.EMSPageFrame + offset));
\r
717 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)
\r
721 emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);
\r
723 PML_MapEMS(page / PMEMSSubPage,emspage);
\r
725 return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)
\r
726 + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));
\r
731 // PM_GetPageAddress() - Returns the address of a given page
\r
732 // Maps in EMS if necessary
\r
733 // Returns nil if block isn't cached into Main Memory or EMS
\r
737 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)
\r
739 PageListStruct far *page;
\r
741 page = &gvar->pm.PMPages[pagenum];
\r
742 if (page->mainPage != -1)
\r
743 return(gvar->pm.mm.MainMemPages[page->mainPage]);
\r
744 else if (page->emsPage != -1)
\r
745 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));
\r
751 // PML_GiveLRUPage() - Returns the page # of the least recently used
\r
752 // present & unlocked main/EMS page (or main page if mainonly is true)
\r
755 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)
\r
759 PageListStruct far *page;
\r
761 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
765 (page->lastHit < last)
\r
766 && ((page->emsPage != -1) || (page->mainPage != -1))
\r
767 && (page->locked == pml_Unlocked)
\r
768 && (!(mainonly && (page->mainPage == -1)))
\r
771 last = page->lastHit;
\r
777 Quit("PML_GiveLRUPage: LRU Search failed");
\r
782 // PML_GiveLRUXMSPage() - Returns the page # of the least recently used
\r
783 // (and present) XMS page.
\r
784 // This routine won't return the XMS page protected (by gvar->pm.xmm.XMSProtectPage)
\r
787 PML_GiveLRUXMSPage(global_game_variables_t *gvar)
\r
791 PageListStruct far *page;
\r
793 for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)
\r
797 (page->xmsPage != -1)
\r
798 && (page->lastHit < last)
\r
799 && (i != gvar->pm.xmm.XMSProtectPage)
\r
802 last = page->lastHit;
\r
810 // PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace
\r
811 // it with the main/EMS page
\r
814 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)
\r
817 PageListStruct far *page;
\r
819 if (!gvar->pm.xmm.XMSPresent)
\r
822 page = &gvar->pm.PMPages[pagenum];
\r
823 if (page->xmsPage != -1)
\r
824 return; // Already in XMS
\r
826 if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)
\r
827 page->xmsPage = gvar->pm.XMSPagesUsed++;
\r
830 usexms = PML_GiveLRUXMSPage(gvar);
\r
832 Quit("PML_PutPageInXMS: No XMS LRU");
\r
833 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;
\r
834 gvar->pm.PMPages[usexms].xmsPage = -1;
\r
836 PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);
\r
840 // PML_TransferPageSpace() - A page is being replaced, so give the new page
\r
841 // the old one's address space. Returns the address of the new page.
\r
844 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)
\r
847 PageListStruct far *origpage,far *newpage;
\r
850 Quit("PML_TransferPageSpace: Identity replacement");
\r
852 origpage = &gvar->pm.PMPages[orig];
\r
853 newpage = &gvar->pm.PMPages[new];
\r
855 if (origpage->locked != pml_Unlocked)
\r
856 Quit("PML_TransferPageSpace: Killing locked page");
\r
858 if ((origpage->emsPage == -1) && (origpage->mainPage == -1))
\r
859 Quit("PML_TransferPageSpace: Reusing non-existent page");
\r
861 // Copy page that's about to be purged into XMS
\r
862 PML_PutPageInXMS(orig, gvar);
\r
864 // Get the address, and force EMS into a physical page if necessary
\r
865 addr = PM_GetPageAddress(orig, gvar);
\r
867 // Steal the address
\r
868 newpage->emsPage = origpage->emsPage;
\r
869 newpage->mainPage = origpage->mainPage;
\r
871 // Mark replaced page as purged
\r
872 origpage->mainPage = origpage->emsPage = -1;
\r
875 Quit("PML_TransferPageSpace: Zero replacement");
\r
881 // PML_GetAPageBuffer() - A page buffer is needed. Either get it from the
\r
882 // main/EMS free pool, or use PML_GiveLRUPage() to find which page to
\r
883 // steal the buffer from. Returns a far pointer to the page buffer, and
\r
884 // sets the fields inside the given page structure appropriately.
\r
885 // If mainonly is true, free EMS will be ignored, and only main pages
\r
886 // will be looked at by PML_GiveLRUPage().
\r
889 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
891 byte far *addr = nil;
\r
894 PageListStruct far *page;
\r
896 page = &gvar->pm.PMPages[pagenum];
\r
897 if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)
\r
899 // There's remaining EMS - use it
\r
900 page->emsPage = gvar->pm.EMSPagesUsed++;
\r
901 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);
\r
903 else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)
\r
905 // There's remaining main memory - use it
\r
906 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)
\r
908 if ((*used & pmba_Allocated) && !(*used & pmba_Used))
\r
911 *used |= pmba_Used;
\r
916 Quit("PML_GetPageBuffer: MainPagesAvail lied");
\r
917 addr = gvar->pm.mm.MainMemPages[n];
\r
919 Quit("PML_GetPageBuffer: Purged main block");
\r
920 page->mainPage = n;
\r
921 gvar->pm.MainPagesUsed++;
\r
924 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);
\r
927 Quit("PML_GetPageBuffer: Search failed");
\r
932 // PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and
\r
933 // replace it with the page from XMS. If mainonly is true, will only
\r
934 // search for LRU main page.
\r
935 // XMSProtectPage is set to the page to be retrieved from XMS, so that if
\r
936 // the page from which we're stealing the main/EMS from isn't in XMS,
\r
937 // it won't copy over the page that we're trying to get from XMS.
\r
938 // (pages that are being purged are copied into XMS, if possible)
\r
941 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
943 byte far *checkaddr;
\r
945 PageListStruct far *page;
\r
947 page = &gvar->pm.PMPages[pagenum];
\r
948 if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))
\r
950 gvar->pm.xmm.XMSProtectPage = pagenum;
\r
951 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
952 if (FP_OFF(checkaddr))
\r
953 Quit("PML_GetPageFromXMS: Non segment pointer");
\r
954 addr = (memptr)FP_SEG(checkaddr);
\r
955 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);
\r
956 gvar->pm.xmm.XMSProtectPage = -1;
\r
963 // PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.
\r
964 // Load it into either main or EMS. If mainonly is true, the page will
\r
965 // only be loaded into main.
\r
968 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)
\r
971 PageListStruct far *page;
\r
973 addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);
\r
974 page = &gvar->pm.PMPages[pagenum];
\r
975 PML_ReadFromFile(addr,page->offset,page->length, gvar);
\r
979 // PM_GetPage() - Returns the address of the page, loading it if necessary
\r
980 // First, check if in Main Memory or EMS
\r
982 // If not in XMS, load into Main Memory or EMS
\r
986 PM_GetPage(int pagenum, global_game_variables_t *gvar)
\r
990 if (pagenum >= gvar->pm.fi.ChunksInFile)
\r
991 Quit("PM_GetPage: Invalid page request");
\r
993 #ifdef __DEBUG_2__ // for debugging
\r
995 mov dx,STATUS_REGISTER_1
\r
998 mov al,ATR_OVERSCAN
\r
1000 mov al,10 // bright green
\r
1005 if (!(result = PM_GetPageAddress(pagenum, gvar)))
\r
1007 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);
\r
1008 if (!gvar->pm.PMPages[pagenum].offset) // JDC: sparse page
\r
1009 Quit ("Tried to load a sparse page!");
\r
1010 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))
\r
1012 if (gvar->pm.PMPages[pagenum].lastHit == gvar->pm.PMFrameCount)
\r
1013 gvar->pm.PMThrashing++;
\r
1015 PML_LoadPage(pagenum,mainonly, gvar);
\r
1016 result = PM_GetPageAddress(pagenum, gvar);
\r
1019 gvar->pm.PMPages[pagenum].lastHit = gvar->pm.PMFrameCount;
\r
1021 #ifdef __DEBUG_2__ // for debugging
\r
1023 mov dx,STATUS_REGISTER_1
\r
1026 mov al,ATR_OVERSCAN
\r
1030 mov al,0x20 // normal
\r
1039 // PM_SetPageLock() - Sets the lock type on a given page
\r
1040 // pml_Unlocked: Normal, page can be purged
\r
1041 // pml_Locked: Cannot be purged
\r
1042 // pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page
\r
1043 // specified when returning the address. For sound stuff.
\r
1046 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)
\r
1048 if (pagenum < gvar->pm.fi.PMSoundStart)
\r
1049 Quit("PM_SetPageLock: Locking/unlocking non-sound page");
\r
1051 gvar->pm.PMPages[pagenum].locked = lock;
\r
1055 // PM_Preload() - Loads as many pages as possible into all types of memory.
\r
1056 // Calls the update function after each load, indicating the current
\r
1057 // page, and the total pages that need to be loaded (for thermometer).
\r
1060 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)
\r
1064 word current,total,
\r
1065 totalnonxms,totalxms,
\r
1066 mainfree,maintotal,
\r
1070 PageListStruct far *p;
\r
1072 mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);
\r
1073 xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);
\r
1075 xmstotal = maintotal = 0;
\r
1077 for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)
\r
1079 if (!gvar->pm.PMPages[i].offset)
\r
1080 continue; // sparse
\r
1082 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )
\r
1083 continue; // already in main mem
\r
1090 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )
\r
1098 total = maintotal + xmstotal;
\r
1107 // cache main/ems blocks
\r
1111 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1
\r
1112 || gvar->pm.PMPages[page].emsPage != -1 )
\r
1115 if (page >= gvar->pm.fi.ChunksInFile)
\r
1116 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1118 PM_GetPage(page, gvar);
\r
1123 update(current,total);
\r
1127 // load stuff to XMS
\r
1131 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)
\r
1133 addr = PM_GetPage(oogypage, gvar);
\r
1135 Quit("PM_Preload: XMS buffer failed");
\r
1139 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )
\r
1142 if (page >= gvar->pm.fi.ChunksInFile)
\r
1143 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");
\r
1145 p = &gvar->pm.PMPages[page];
\r
1147 p->xmsPage = gvar->pm.XMSPagesUsed++;
\r
1148 if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)
\r
1149 Quit("PM_Preload: Exceeded XMS pages");
\r
1150 if (p->length > PMPageSize)
\r
1151 Quit("PM_Preload: Page too long");
\r
1153 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1154 PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);
\r
1159 update(current,total);
\r
1162 p = &gvar->pm.PMPages[oogypage];
\r
1163 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);
\r
1166 update(total,total);
\r
1169 /////////////////////////////////////////////////////////////////////////////
\r
1173 /////////////////////////////////////////////////////////////////////////////
\r
1176 // PM_NextFrame() - Increments the frame counter and adjusts the thrash
\r
1177 // avoidence variables
\r
1179 // If currently in panic mode (to avoid thrashing), check to see if the
\r
1180 // appropriate number of frames have passed since the last time that
\r
1181 // we would have thrashed. If so, take us out of panic mode.
\r
1185 PM_NextFrame(global_game_variables_t *gvar)
\r
1189 // Frame count overrun - kill the LRU hit entries & reset frame count
\r
1190 if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)
\r
1192 for (i = 0;i < gvar->pm.PMNumBlocks;i++)
\r
1193 gvar->pm.PMPages[i].lastHit = 0;
\r
1194 gvar->pm.PMFrameCount = 0;
\r
1198 for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)
\r
1200 if (gvar->pm.PMPages[i].locked)
\r
1203 sprintf(buf,"PM_NextFrame: Page %d is locked",i);
\r
1209 if (gvar->pm.PMPanicMode)
\r
1211 // DEBUG - set border color
\r
1212 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))
\r
1214 // DEBUG - reset border color
\r
1217 if (gvar->pm.PMThrashing >= PMThrashThreshold)
\r
1218 gvar->pm.PMPanicMode = PMUnThrashThreshold;
\r
1219 gvar->pm.PMThrashing = false;
\r
1223 // PM_Reset() - Sets up caching structures
\r
1226 PM_Reset(global_game_variables_t *gvar)
\r
1229 PageListStruct far *page;
\r
1231 gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;
\r
1233 gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);
\r
1234 gvar->pm.emm.EMSPhysicalPage = 0;
\r
1236 gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;
\r
1238 gvar->pm.PMPanicMode = false;
\r
1240 // Initialize page list
\r
1241 for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)
\r
1243 page->mainPage = -1;
\r
1244 page->emsPage = -1;
\r
1245 page->xmsPage = -1;
\r
1246 page->locked = false;
\r
1251 // PM_Startup() - Start up the Page Mgr
\r
1254 PM_Startup(global_game_variables_t *gvar)
\r
1256 boolean nomain,noems,noxms;
\r
1259 if (gvar->pm.PMStarted)
\r
1262 strcat(&(gvar->pm.fi.PageFileName), "VSWAP.");
\r
1263 gvar->pm.fi.PageFile = -1;
\r
1264 gvar->pm.xmm.XMSProtectPage = -1;
\r
1266 nomain = noems = noxms = false;
\r
1268 #ifdef __WATCOMC__
\r
1271 #ifdef __BORLANDC__
\r
1276 switch (US_CheckParm(
\r
1277 #ifdef __WATCOMC__
\r
1280 #ifdef __BORLANDC__
\r
1297 PML_OpenPageFile(gvar);
\r
1300 PML_StartupEMS(gvar);
\r
1302 PML_StartupXMS(gvar);
\r
1304 if (nomain && !gvar->pm.emm.EMSPresent)
\r
1306 Quit("PM_Startup: No main or EMS\n");
\r
1310 PML_StartupMainMem(gvar);
\r
1314 gvar->pm.PMStarted = true;
\r
1318 // PM_Shutdown() - Shut down the Page Mgr
\r
1321 PM_Shutdown(global_game_variables_t *gvar)
\r
1323 PML_ShutdownXMS(gvar);
\r
1324 PML_ShutdownEMS(gvar);
\r
1326 if (!gvar->pm.PMStarted)
\r
1329 PML_ClosePageFile(gvar);
\r
1331 PML_ShutdownMainMem(gvar);
\r