dlls/winedos/dosmem.c

   1 /*
   2  * DOS memory emulation
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  * Copyright 1996 Marcus Meissner
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include "config.h"
  23 #include "wine/port.h"
  24
  25 #include <signal.h>
  26 #include <stdarg.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/types.h>
  30 #ifdef HAVE_SYS_MMAN_H
  31 # include <sys/mman.h>
  32 #endif
  33
  34 #include "windef.h"
  35 #include "winbase.h"
  36 #include "winreg.h"
  37 #include "excpt.h"
  38 #include "winternl.h"
  39 #include "wine/winbase16.h"
  40
  41 #include "dosexe.h"
  42 #include "wine/debug.h"
  43
  44 WINE_DEFAULT_DEBUG_CHANNEL(dosmem);
  45
  46 /* DOS memory highest address (including HMA) */
  47 #define DOSMEM_SIZE             0x110000
  48 #define DOSMEM_64KB             0x10000
  49
  50 /* see dlls/kernel/dosmem.c for the details */
  51 static char *DOSMEM_dosmem;
  52 static char *DOSMEM_sysmem;
  53
  54 /*
  55  * Memory Control Block (MCB) definition
  56  * FIXME: implement Allocation Strategy
  57  */
  58
  59 #define MCB_DUMP(mc) \
  60     TRACE ("MCB_DUMP base=%p type=%02xh psp=%04xh size=%04xh\n", mc, mc->type, mc->psp , mc->size )
  61
  62 #define MCB_NEXT(mc) \
  63     (MCB*) ((mc->type==MCB_TYPE_LAST) ? NULL : (char*)(mc) + ((mc->size + 1) << 4) )
  64
  65 /* FIXME: should we check more? */
  66 #define MCB_VALID(mc) \
  67     ((mc->type==MCB_TYPE_NORMAL) || (mc->type==MCB_TYPE_LAST))
  68
  69
  70 #define MCB_TYPE_NORMAL    0x4d
  71 #define MCB_TYPE_LAST      0x5a
  72
  73 #define MCB_PSP_DOS        0x0060
  74 #define MCB_PSP_FREE       0
  75
  76 #include "pshpack1.h"
  77 typedef struct {
  78     BYTE type;
  79     WORD psp;     /* segment of owner psp */
  80     WORD size;    /* in paragraphs */
  81     BYTE pad[3];
  82     BYTE name[8];
  83 } MCB;
  84 #include "poppack.h"
  85
  86 /*
  87 #define __DOSMEM_DEBUG__
  88  */
  89
  90 #define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */
  91 #define VM_STUB_SEGMENT 0xf000         /* BIOS segment */
  92
  93 /* FIXME: this should be moved to the LOL */
  94 static MCB* DOSMEM_root_block;
  95
  96 /***********************************************************************
  97  *           DOSMEM_MemoryTop
  98  *
  99  * Gets the DOS memory top.
 100  */
 101 static char *DOSMEM_MemoryTop(void)
 102 {
 103     return DOSMEM_dosmem+0x9FFFC; /* 640K */
 104 }
 105
 106 /***********************************************************************
 107  *           DOSMEM_FillIsrTable
 108  *
 109  * Fill the interrupt table with fake BIOS calls to BIOSSEG (0xf000).
 110  *
 111  * NOTES:
 112  * Linux normally only traps INTs performed from or destined to BIOSSEG
 113  * for us to handle, if the int_revectored table is empty. Filling the
 114  * interrupt table with calls to INT stubs in BIOSSEG allows DOS programs
 115  * to hook interrupts, as well as use their familiar retf tricks to call
 116  * them, AND let Wine handle any unhooked interrupts transparently.
 117  */
 118 static void DOSMEM_FillIsrTable(void)
 119 {
 120     SEGPTR *isr = (SEGPTR*)DOSMEM_sysmem;
 121     int x;
 122
 123     for (x=0; x<256; x++) isr[x]=MAKESEGPTR(VM_STUB_SEGMENT,x*4);
 124 }
 125
 126 static void DOSMEM_MakeIsrStubs(void)
 127 {
 128     DWORD *stub = (DWORD*)(DOSMEM_dosmem + (VM_STUB_SEGMENT << 4));
 129     int x;
 130
 131     for (x=0; x<256; x++) stub[x]=VM_STUB(x);
 132 }
 133
 134 BIOSDATA* DOSVM_BiosData(void)
 135 {
 136     return (BIOSDATA *)(DOSMEM_sysmem + 0x400);
 137 }
 138
 139 /**********************************************************************
 140  *          DOSMEM_GetTicksSinceMidnight
 141  *
 142  * Return number of clock ticks since midnight.
 143  */
 144 static DWORD DOSMEM_GetTicksSinceMidnight(void)
 145 {
 146     SYSTEMTIME time;
 147
 148     /* This should give us the (approximately) correct
 149      * 18.206 clock ticks per second since midnight.
 150      */
 151
 152     GetLocalTime( &time );
 153
 154     return (((time.wHour * 3600 + time.wMinute * 60 +
 155               time.wSecond) * 18206) / 1000) +
 156              (time.wMilliseconds * 1000 / 54927);
 157 }
 158
 159 /***********************************************************************
 160  *           DOSMEM_FillBiosSegments
 161  *
 162  * Fill the BIOS data segment with dummy values.
 163  */
 164 static void DOSMEM_FillBiosSegments(void)
 165 {
 166     BYTE *pBiosSys = (BYTE*)DOSMEM_dosmem + 0xf0000;
 167     BYTE *pBiosROMTable = pBiosSys+0xe6f5;
 168     BIOSDATA *pBiosData = DOSVM_BiosData();
 169     static const char bios_date[] = "13/01/99";
 170
 171       /* Clear all unused values */
 172     memset( pBiosData, 0, sizeof(*pBiosData) );
 173
 174     /* FIXME: should check the number of configured drives and ports */
 175     pBiosData->Com1Addr             = 0x3f8;
 176     pBiosData->Com2Addr             = 0x2f8;
 177     pBiosData->Lpt1Addr             = 0x378;
 178     pBiosData->Lpt2Addr             = 0x278;
 179     pBiosData->InstalledHardware    = 0x5463;
 180     pBiosData->MemSize              = 640;
 181     pBiosData->NextKbdCharPtr       = 0x1e;
 182     pBiosData->FirstKbdCharPtr      = 0x1e;
 183     pBiosData->VideoMode            = 3;
 184     pBiosData->VideoColumns         = 80;
 185     pBiosData->VideoPageSize        = 80 * 25 * 2;
 186     pBiosData->VideoPageStartAddr   = 0xb800;
 187     pBiosData->VideoCtrlAddr        = 0x3d4;
 188     pBiosData->Ticks                = DOSMEM_GetTicksSinceMidnight();
 189     pBiosData->NbHardDisks          = 2;
 190     pBiosData->KbdBufferStart       = 0x1e;
 191     pBiosData->KbdBufferEnd         = 0x3e;
 192     pBiosData->RowsOnScreenMinus1   = 24;
 193     pBiosData->BytesPerChar         = 0x10;
 194     pBiosData->ModeOptions          = 0x64;
 195     pBiosData->FeatureBitsSwitches  = 0xf9;
 196     pBiosData->VGASettings          = 0x51;
 197     pBiosData->DisplayCombination   = 0x08;
 198     pBiosData->DiskDataRate         = 0;
 199
 200     /* fill ROM configuration table (values from Award) */
 201     *(pBiosROMTable+0x0)        = 0x08; /* number of bytes following LO */
 202     *(pBiosROMTable+0x1)        = 0x00; /* number of bytes following HI */
 203     *(pBiosROMTable+0x2)        = 0xfc; /* model */
 204     *(pBiosROMTable+0x3)        = 0x01; /* submodel */
 205     *(pBiosROMTable+0x4)        = 0x00; /* BIOS revision */
 206     *(pBiosROMTable+0x5)        = 0x74; /* feature byte 1 */
 207     *(pBiosROMTable+0x6)        = 0x00; /* feature byte 2 */
 208     *(pBiosROMTable+0x7)        = 0x00; /* feature byte 3 */
 209     *(pBiosROMTable+0x8)        = 0x00; /* feature byte 4 */
 210     *(pBiosROMTable+0x9)        = 0x00; /* feature byte 5 */
 211
 212     /* BIOS date string */
 213     memcpy(pBiosSys+0xfff5, bios_date, sizeof bios_date);
 214
 215     /* BIOS ID */
 216     *(pBiosSys+0xfffe) = 0xfc;
 217
 218     /* Reboot vector (f000:fff0 or ffff:0000) */
 219     *(DWORD*)(pBiosSys + 0xfff0) = VM_STUB(0x19);
 220 }
 221
 222 /***********************************************************************
 223  *           BiosTick
 224  *
 225  * Increment the BIOS tick counter. Called by timer signal handler.
 226  */
 227 void BiosTick( WORD timer )
 228 {
 229     BIOSDATA *pBiosData = DOSVM_BiosData();
 230     if (pBiosData) pBiosData->Ticks++;
 231 }
 232
 233 /***********************************************************************
 234  *           DOSMEM_Collapse
 235  *
 236  * Helper function for internal use only.
 237  * Atach all following free blocks to this one, even if this one is not free.
 238  */
 239 void DOSMEM_Collapse( MCB* mcb )
 240 {
 241     MCB* next = MCB_NEXT( mcb );
 242
 243     while (next && next->psp == MCB_PSP_FREE)
 244     {
 245         mcb->size = mcb->size + next->size + 1;
 246         mcb->type = next->type;    /* make sure keeping MCB_TYPE_LAST */
 247         next = MCB_NEXT( next );
 248     }
 249 }
 250
 251 /***********************************************************************
 252  *           DOSMEM_AllocBlock
 253  *
 254  * Carve a chunk of the DOS memory block (without selector).
 255  */
 256 LPVOID DOSMEM_AllocBlock(UINT size, UINT16* pseg)
 257 {
 258     MCB *curr = DOSMEM_root_block;
 259     MCB *next = NULL;
 260     WORD psp = DOSVM_psp;
 261
 262     if (!psp)
 263         psp = MCB_PSP_DOS;
 264
 265     *pseg = 0;
 266
 267     TRACE( "(%04xh)\n", size );
 268
 269     /* round up to paragraph */
 270     size = (size + 15) >> 4;
 271
 272 #ifdef __DOSMEM_DEBUG__
 273     DOSMEM_Available();     /* checks the whole MCB list */
 274 #endif
 275
 276     /* loop over all MCB and search the next large enough MCB */
 277     while (curr)
 278     {
 279         if (!MCB_VALID (curr))
 280         {
 281             ERR( "MCB List Corrupt\n" );
 282             MCB_DUMP( curr );
 283             return NULL;
 284         }
 285         if (curr->psp == MCB_PSP_FREE)
 286         {
 287             DOSMEM_Collapse( curr );
 288             /* is it large enough (one paragaph for the MCB)? */
 289             if (curr->size >= size)
 290             {
 291                 if (curr->size > size)
 292                 {
 293                     /* split curr */
 294                     next = (MCB *) ((char*) curr + ((size+1) << 4));
 295                     next->psp = MCB_PSP_FREE;
 296                     next->size = curr->size - (size+1);
 297                     next->type = curr->type;
 298                     curr->type = MCB_TYPE_NORMAL;
 299                     curr->size = size;
 300                 }
 301                 /* curr is the found block */
 302                 curr->psp = psp;
 303                 if( pseg ) *pseg = (((char*)curr) + 16 - (char*)DOSMEM_dosmem) >> 4;
 304                 return (LPVOID) ((char*)curr + 16);
 305             }
 306         }
 307         curr = MCB_NEXT(curr);
 308     }
 309     return NULL;
 310 }
 311
 312 /***********************************************************************
 313  *           DOSMEM_FreeBlock
 314  */
 315 BOOL DOSMEM_FreeBlock(void* ptr)
 316 {
 317     MCB* mcb = (MCB*) ((char*)ptr - 16);
 318
 319     TRACE( "(%p)\n", ptr );
 320
 321 #ifdef __DOSMEM_DEBUG__
 322     DOSMEM_Available();
 323 #endif
 324
 325     if (!MCB_VALID (mcb))
 326     {
 327         ERR( "MCB invalid\n" );
 328         MCB_DUMP( mcb );
 329         return FALSE;
 330     }
 331
 332     mcb->psp = MCB_PSP_FREE;
 333     DOSMEM_Collapse( mcb );
 334     return TRUE;
 335 }
 336
 337 /***********************************************************************
 338  *           DOSMEM_ResizeBlock
 339  *
 340  * Resize DOS memory block in place. Returns block size or -1 on error.
 341  *
 342  * If exact is TRUE, returned value is either old or requested block
 343  * size. If exact is FALSE, block is expanded even if there is not
 344  * enough space for full requested block size.
 345  *
 346  * TODO: return also biggest block size
 347  */
 348 UINT DOSMEM_ResizeBlock(void *ptr, UINT size, BOOL exact)
 349 {
 350     MCB* mcb = (MCB*) ((char*)ptr - 16);
 351     MCB* next;
 352
 353     TRACE( "(%p,%04xh,%s)\n", ptr, size, exact ? "TRUE" : "FALSE" );
 354
 355     /* round up to paragraph */
 356     size = (size + 15) >> 4;
 357
 358 #ifdef __DOSMEM_DEBUG__
 359     DOSMEM_Available();
 360 #endif
 361
 362     if (!MCB_VALID (mcb))
 363     {
 364         ERR( "MCB invalid\n" );
 365         MCB_DUMP( mcb );
 366         return -1;
 367     }
 368
 369     /* resize needed? */
 370     if (mcb->size == size)
 371         return size;
 372
 373     /* collapse free blocks */
 374     DOSMEM_Collapse( mcb );
 375
 376     /* shrink mcb ? */
 377     if (mcb->size > size)
 378     {
 379         next = (MCB *) ((char*)mcb + ((size+1) << 4));
 380         next->type = mcb->type;
 381         next->psp = MCB_PSP_FREE;
 382         next->size = mcb->size - (size+1);
 383         mcb->type = MCB_TYPE_NORMAL;
 384         mcb->size = size;
 385         return size << 4;
 386     }
 387
 388     if (!exact)
 389     {
 390         return mcb->size << 4;
 391     }
 392
 393     return -1;
 394 }
 395
 396 /***********************************************************************
 397  *           DOSMEM_Available
 398  */
 399 UINT DOSMEM_Available(void)
 400 {
 401     UINT  available = 0;
 402     UINT  total = 0;
 403     MCB *curr = DOSMEM_root_block;
 404     /* loop over all MCB and search the largest free MCB */
 405     while (curr)
 406     {
 407 #ifdef __DOSMEM_DEBUG__
 408         MCB_DUMP( curr );
 409 #endif
 410         if (!MCB_VALID (curr))
 411         {
 412             ERR( "MCB List Corrupt\n" );
 413             MCB_DUMP( curr );
 414             return 0;
 415         }
 416         if (curr->psp == MCB_PSP_FREE &&
 417             curr->size > available )
 418             available = curr->size;
 419
 420         total += curr->size + 1;
 421         curr = MCB_NEXT( curr );
 422     }
 423     TRACE( " %04xh of %04xh paragraphs available\n", available, total );
 424     return available << 4;
 425 }
 426
 427 /***********************************************************************
 428  *           DOSMEM_InitMemory
 429  *
 430  * Initialises the DOS memory structures.
 431  */
 432 static void DOSMEM_InitMemory(char* addr)
 433 {
 434     DOSMEM_FillBiosSegments();
 435     DOSMEM_FillIsrTable();
 436
 437     /* align root block to paragraph */
 438     DOSMEM_root_block = (MCB*) (( (DWORD_PTR)(addr+0xf) >> 4) << 4);
 439     DOSMEM_root_block->type = MCB_TYPE_LAST;
 440     DOSMEM_root_block->psp = MCB_PSP_FREE;
 441     DOSMEM_root_block->size = (DOSMEM_MemoryTop() - ((char*)DOSMEM_root_block)) >> 4;
 442
 443     TRACE("DOS conventional memory initialized, %d bytes free.\n",
 444           DOSMEM_Available());
 445 }
 446
 447 /******************************************************************
 448  *             DOSMEM_InitDosMemory
 449  *
 450  * When WineDOS is loaded, initializes the current DOS memory layout.
 451  */
 452 BOOL DOSMEM_InitDosMemory(void)
 453 {
 454     HMODULE16           hModule;
 455     unsigned short      sel;
 456     LDT_ENTRY           entry;
 457     DWORD               reserve;
 458
 459     if (!(hModule = GetModuleHandle16("KERNEL"))) return FALSE;
 460     /* KERNEL.194: __F000H */
 461     sel = LOWORD(GetProcAddress16(hModule, (LPCSTR)(ULONG_PTR)194));
 462     wine_ldt_get_entry(sel, &entry);
 463     DOSMEM_dosmem = (char*)wine_ldt_get_base(&entry) - 0xF0000;
 464     /* KERNEL.183: __0000H */
 465     sel = LOWORD(GetProcAddress16(hModule, (LPCSTR)(DWORD_PTR)183));
 466     wine_ldt_get_entry(sel, &entry);
 467     DOSMEM_sysmem = wine_ldt_get_base(&entry);
 468
 469     /*
 470      * Reserve either:
 471      * - lowest 64k for NULL pointer catching (Win16)
 472      * - lowest 1k for interrupt handlers and
 473      *   another 0.5k for BIOS, DOS and intra-application
 474      *   areas (DOS)
 475      */
 476     if (DOSMEM_dosmem != DOSMEM_sysmem)
 477         reserve = 0x10000; /* 64k */
 478     else
 479         reserve = 0x600; /* 1.5k */
 480
 481     /*
 482      * Round to paragraph boundary in order to make
 483      * sure the alignment is correct.
 484      */
 485     reserve = ((reserve + 15) >> 4) << 4;
 486
 487     /*
 488      * Set DOS memory base and initialize conventional memory.
 489      */
 490     DOSMEM_InitMemory(DOSMEM_dosmem + reserve);
 491     return TRUE;
 492 }
 493
 494 /******************************************************************
 495  *              DOSMEM_MapDosLayout
 496  *
 497  * Initialize the first MB of memory to look like a real DOS setup
 498  */
 499 BOOL DOSMEM_MapDosLayout(void)
 500 {
 501     static int already_mapped;
 502
 503     if (!already_mapped)
 504     {
 505         HMODULE16       hModule;
 506         unsigned short  sel;
 507         LDT_ENTRY       entry;
 508
 509         if (DOSMEM_dosmem)
 510         {
 511             ERR( "Needs access to the first megabyte for DOS mode\n" );
 512             ExitProcess(1);
 513         }
 514         MESSAGE( "Warning: unprotecting memory to allow real-mode calls.\n"
 515                  "         NULL pointer accesses will no longer be caught.\n" );
 516         VirtualProtect( NULL, DOSMEM_SIZE, PAGE_EXECUTE_READWRITE, NULL );
 517         /* copy the BIOS and ISR area down */
 518         memcpy( DOSMEM_dosmem, DOSMEM_sysmem, 0x400 + 0x100 );
 519         DOSMEM_sysmem = DOSMEM_dosmem;
 520         hModule = GetModuleHandle16("KERNEL");
 521         /* selector to 0000H */
 522         sel = LOWORD(GetProcAddress16(hModule, (LPCSTR)(DWORD_PTR)183));
 523         wine_ldt_get_entry(sel, &entry);
 524         wine_ldt_set_base(&entry, NULL);
 525         wine_ldt_set_entry(sel, &entry);
 526         /* selector to BiosData */
 527         sel = LOWORD(GetProcAddress16(hModule, (LPCSTR)(DWORD_PTR)193));
 528         wine_ldt_get_entry(sel, &entry);
 529         wine_ldt_set_base(&entry, (const void*)0x400);
 530         wine_ldt_set_entry(sel, &entry);
 531         /* we may now need the actual interrupt stubs, and since we've just moved the
 532          * interrupt vector table away, we can fill the area with stubs instead... */
 533         DOSMEM_MakeIsrStubs();
 534         already_mapped = 1;
 535     }
 536     return TRUE;
 537 }