msdos/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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "config.h"
  23 #include "wine/port.h"
  24
  25 #include <signal.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/types.h>
  29 #ifdef HAVE_SYS_MMAN_H
  30 # include <sys/mman.h>
  31 #endif
  32
  33 #include "winbase.h"
  34 #include "wine/winbase16.h"
  35
  36 #include "global.h"
  37 #include "selectors.h"
  38 #include "miscemu.h"
  39 #include "wine/debug.h"
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(dosmem);
  42 WINE_DECLARE_DEBUG_CHANNEL(selector);
  43
  44 WORD DOSMEM_0000H;        /* segment at 0:0 */
  45 WORD DOSMEM_BiosDataSeg;  /* BIOS data segment at 0x40:0 */
  46 WORD DOSMEM_BiosSysSeg;   /* BIOS ROM segment at 0xf000:0 */
  47
  48 DWORD DOSMEM_CollateTable;
  49
  50 static int StructOffset[256];            /* Offsets for all structures at f000:e000*/
  51 static int CurrentStructOffset = 0xe000; /* Current free offset */
  52
  53 /* use 2 low bits of 'size' for the housekeeping */
  54
  55 #define DM_BLOCK_DEBUG          0xABE00000
  56 #define DM_BLOCK_TERMINAL       0x00000001
  57 #define DM_BLOCK_FREE           0x00000002
  58 #define DM_BLOCK_MASK           0x001FFFFC
  59
  60 /*
  61 #define __DOSMEM_DEBUG__
  62  */
  63
  64 typedef struct {
  65    unsigned     size;
  66 } dosmem_entry;
  67
  68 typedef struct {
  69   unsigned      blocks;
  70   unsigned      free;
  71 } dosmem_info;
  72
  73 #define NEXT_BLOCK(block) \
  74         (dosmem_entry*)(((char*)(block)) + \
  75          sizeof(dosmem_entry) + ((block)->size & DM_BLOCK_MASK))
  76
  77 #define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */
  78 #define VM_STUB_SEGMENT 0xf000         /* BIOS segment */
  79
  80 /* DOS memory base */
  81 static char *DOSMEM_dosmem;
  82 /* DOS system base (for interrupt vector table and BIOS data area)
  83  * ...should in theory (i.e. Windows) be equal to DOSMEM_dosmem (NULL),
  84  * but is normally set to 0xf0000 in Wine to allow trapping of NULL pointers,
  85  * and only relocated to NULL when absolutely necessary */
  86 static char *DOSMEM_sysmem;
  87
  88 /* various real-mode code stubs */
  89 WORD DOSMEM_wrap_seg;
  90 WORD DOSMEM_xms_seg;
  91 WORD DOSMEM_dpmi_seg;
  92 WORD DOSMEM_dpmi_sel;
  93
  94 DWORD DOS_LOLSeg;
  95
  96 /***********************************************************************
  97  *           DOSMEM_SystemBase
  98  *
  99  * Gets the virtual DOS memory base (interrupt table).
 100  */
 101 char *DOSMEM_SystemBase(void)
 102 {
 103     return DOSMEM_sysmem;
 104 }
 105
 106 /***********************************************************************
 107  *           DOSMEM_MemoryBase
 108  *
 109  * Gets the DOS memory base.
 110  */
 111 char *DOSMEM_MemoryBase(void)
 112 {
 113     return DOSMEM_dosmem;
 114 }
 115
 116 /***********************************************************************
 117  *           DOSMEM_MemoryTop
 118  *
 119  * Gets the DOS memory top.
 120  */
 121 static char *DOSMEM_MemoryTop(void)
 122 {
 123     return DOSMEM_dosmem+0x9FFFC; /* 640K */
 124 }
 125
 126 /***********************************************************************
 127  *           DOSMEM_InfoBlock
 128  *
 129  * Gets the DOS memory info block.
 130  */
 131 static dosmem_info *DOSMEM_InfoBlock(void)
 132 {
 133     return (dosmem_info*)(DOSMEM_dosmem+0x10000); /* 64K */
 134 }
 135
 136 /***********************************************************************
 137  *           DOSMEM_RootBlock
 138  *
 139  * Gets the DOS memory root block.
 140  */
 141 static dosmem_entry *DOSMEM_RootBlock(void)
 142 {
 143     /* first block has to be paragraph-aligned */
 144     return (dosmem_entry*)(((char*)DOSMEM_InfoBlock()) +
 145                            ((((sizeof(dosmem_info) + 0xf) & ~0xf) - sizeof(dosmem_entry))));
 146 }
 147
 148 /***********************************************************************
 149  *           DOSMEM_FillIsrTable
 150  *
 151  * Fill the interrupt table with fake BIOS calls to BIOSSEG (0xf000).
 152  *
 153  * NOTES:
 154  * Linux normally only traps INTs performed from or destined to BIOSSEG
 155  * for us to handle, if the int_revectored table is empty. Filling the
 156  * interrupt table with calls to INT stubs in BIOSSEG allows DOS programs
 157  * to hook interrupts, as well as use their familiar retf tricks to call
 158  * them, AND let Wine handle any unhooked interrupts transparently.
 159  */
 160 static void DOSMEM_FillIsrTable(void)
 161 {
 162     SEGPTR *isr = (SEGPTR*)DOSMEM_sysmem;
 163     int x;
 164
 165     for (x=0; x<256; x++) isr[x]=MAKESEGPTR(VM_STUB_SEGMENT,x*4);
 166 }
 167
 168 static void DOSMEM_MakeIsrStubs(void)
 169 {
 170     DWORD *stub = (DWORD*)(DOSMEM_dosmem + (VM_STUB_SEGMENT << 4));
 171     int x;
 172
 173     for (x=0; x<256; x++) stub[x]=VM_STUB(x);
 174 }
 175
 176 /***********************************************************************
 177  *           DOSMEM_InitDPMI
 178  *
 179  * Allocate the global DPMI RMCB wrapper.
 180  */
 181 static void DOSMEM_InitDPMI(void)
 182 {
 183     LPSTR ptr;
 184
 185     static const char wrap_code[]={
 186      0xCD,0x31, /* int $0x31 */
 187      0xCB       /* lret */
 188     };
 189
 190     static const char enter_xms[]=
 191     {
 192         /* XMS hookable entry point */
 193         0xEB,0x03,           /* jmp entry */
 194         0x90,0x90,0x90,      /* nop;nop;nop */
 195                              /* entry: */
 196         /* real entry point */
 197         /* for simplicity, we'll just use the same hook as DPMI below */
 198         0xCD,0x31,           /* int $0x31 */
 199         0xCB                 /* lret */
 200     };
 201
 202     static const char enter_pm[]=
 203     {
 204         0x50,                /* pushw %ax */
 205         0x52,                /* pushw %dx */
 206         0x55,                /* pushw %bp */
 207         0x89,0xE5,           /* movw %sp,%bp */
 208         /* get return CS */
 209         0x8B,0x56,0x08,      /* movw 8(%bp),%dx */
 210         /* just call int 31 here to get into protected mode... */
 211         /* it'll check whether it was called from dpmi_seg... */
 212         0xCD,0x31,           /* int $0x31 */
 213         /* we are now in the context of a 16-bit relay call */
 214         /* need to fixup our stack;
 215          * 16-bit relay return address will be lost, but we won't worry quite yet */
 216         0x8E,0xD0,           /* movw %ax,%ss */
 217         0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
 218         /* set return CS */
 219         0x89,0x56,0x08,      /* movw %dx,8(%bp) */
 220         0x5D,                /* popw %bp */
 221         0x5A,                /* popw %dx */
 222         0x58,                /* popw %ax */
 223         0xCB                 /* lret */
 224     };
 225
 226     ptr = DOSMEM_GetBlock( sizeof(wrap_code), &DOSMEM_wrap_seg );
 227     memcpy( ptr, wrap_code, sizeof(wrap_code) );
 228     ptr = DOSMEM_GetBlock( sizeof(enter_xms), &DOSMEM_xms_seg );
 229     memcpy( ptr, enter_xms, sizeof(enter_xms) );
 230     ptr = DOSMEM_GetBlock( sizeof(enter_pm), &DOSMEM_dpmi_seg );
 231     memcpy( ptr, enter_pm, sizeof(enter_pm) );
 232     DOSMEM_dpmi_sel = SELECTOR_AllocBlock( ptr, sizeof(enter_pm), WINE_LDT_FLAGS_CODE );
 233 }
 234
 235 BIOSDATA * DOSMEM_BiosData()
 236 {
 237     return (BIOSDATA *)(DOSMEM_sysmem + 0x400);
 238 }
 239
 240 BYTE * DOSMEM_BiosSys()
 241 {
 242     return DOSMEM_dosmem+0xf0000;
 243 }
 244
 245 /* Add a structure in the BiosSys area (with size and index) and
 246    return its offset */
 247 WORD DOSMEM_AddBiosSysStruct(int size,int index)
 248 {
 249   int Offset = CurrentStructOffset;
 250   StructOffset[index]= CurrentStructOffset;
 251   CurrentStructOffset += size;
 252   return Offset;
 253 }
 254
 255 /* Return the offset of a structure specified by the index */
 256 WORD DOSMEM_GetBiosSysStructOffset(int index)
 257 {
 258   return StructOffset[index];
 259 }
 260
 261
 262 /***********************************************************************
 263  *           DOSMEM_FillBiosSegments
 264  *
 265  * Fill the BIOS data segment with dummy values.
 266  */
 267 static void DOSMEM_FillBiosSegments(void)
 268 {
 269     BYTE *pBiosSys = DOSMEM_BiosSys();
 270     BYTE *pBiosROMTable = pBiosSys+0xe6f5;
 271     BIOSDATA *pBiosData = DOSMEM_BiosData();
 272
 273     /* Supported VESA mode, see int10.c */
 274     WORD ConstVesaModeList[]={0x00,0x01,0x02,0x03,0x07,0x0D,0x0E,0x10,0x12,0x13,
 275                               0x100,0x101,0x102,0x103,0x104,0x105,0x106,0x107,0x10D,0x10E,
 276                               0x10F,0x110,0x111,0x112,0x113,0x114,0x115,0x116,0x117,0x118,
 277                               0x119,0x11A,0x11B,0xFFFF};
 278     char * ConstVesaString = "WINE SVGA BOARD";
 279     int i;
 280
 281     VIDEOFUNCTIONALITY *pVidFunc = (VIDEOFUNCTIONALITY *)
 282           (pBiosSys+DOSMEM_AddBiosSysStruct(sizeof(VIDEOFUNCTIONALITY),OFF_VIDEOFUNCTIONALITY));
 283     VIDEOSTATE *pVidState = (VIDEOSTATE *)
 284           (pBiosSys+DOSMEM_AddBiosSysStruct(sizeof(VIDEOSTATE),OFF_VIDEOSTATE));
 285     VESAINFO *pVesaInfo = (VESAINFO *)
 286           (pBiosSys+DOSMEM_AddBiosSysStruct(sizeof(VESAINFO),OFF_VESAINFO));
 287     char * VesaString = (char *)
 288           (pBiosSys+DOSMEM_AddBiosSysStruct(strlen(ConstVesaString)+1,OFF_VESASTRING));
 289     WORD * VesaModeList = (WORD *)
 290           (pBiosSys+DOSMEM_AddBiosSysStruct(sizeof(ConstVesaModeList),OFF_VESAMODELIST));
 291
 292       /* Clear all unused values */
 293     memset( pBiosData, 0, sizeof(*pBiosData) );
 294     memset( pVidFunc,  0, sizeof(*pVidFunc ) );
 295     memset( pVidState, 0, sizeof(*pVidState) );
 296     memset( pVesaInfo, 0, sizeof(*pVesaInfo) );
 297
 298     /* FIXME: should check the number of configured drives and ports */
 299     pBiosData->Com1Addr             = 0x3f8;
 300     pBiosData->Com2Addr             = 0x2f8;
 301     pBiosData->Lpt1Addr             = 0x378;
 302     pBiosData->Lpt2Addr             = 0x278;
 303     pBiosData->InstalledHardware    = 0x5463;
 304     pBiosData->MemSize              = 640;
 305     pBiosData->NextKbdCharPtr       = 0x1e;
 306     pBiosData->FirstKbdCharPtr      = 0x1e;
 307     pBiosData->VideoMode            = 3;
 308     pBiosData->VideoColumns         = 80;
 309     pBiosData->VideoPageSize        = 80 * 25 * 2;
 310     pBiosData->VideoPageStartAddr   = 0xb800;
 311     pBiosData->VideoCtrlAddr        = 0x3d4;
 312     pBiosData->Ticks                = INT1A_GetTicksSinceMidnight();
 313     pBiosData->NbHardDisks          = 2;
 314     pBiosData->KbdBufferStart       = 0x1e;
 315     pBiosData->KbdBufferEnd         = 0x3e;
 316     pBiosData->RowsOnScreenMinus1   = 24;
 317     pBiosData->BytesPerChar         = 0x10;
 318     pBiosData->ModeOptions          = 0x64;
 319     pBiosData->FeatureBitsSwitches  = 0xf9;
 320     pBiosData->VGASettings          = 0x51;
 321     pBiosData->DisplayCombination   = 0x08;
 322     pBiosData->DiskDataRate         = 0;
 323
 324     /* fill ROM configuration table (values from Award) */
 325     *(pBiosROMTable+0x0)        = 0x08; /* number of bytes following LO */
 326     *(pBiosROMTable+0x1)        = 0x00; /* number of bytes following HI */
 327     *(pBiosROMTable+0x2)        = 0xfc; /* model */
 328     *(pBiosROMTable+0x3)        = 0x01; /* submodel */
 329     *(pBiosROMTable+0x4)        = 0x00; /* BIOS revision */
 330     *(pBiosROMTable+0x5)        = 0x74; /* feature byte 1 */
 331     *(pBiosROMTable+0x6)        = 0x00; /* feature byte 2 */
 332     *(pBiosROMTable+0x7)        = 0x00; /* feature byte 3 */
 333     *(pBiosROMTable+0x8)        = 0x00; /* feature byte 4 */
 334     *(pBiosROMTable+0x9)        = 0x00; /* feature byte 5 */
 335
 336
 337     for (i = 0; i < 7; i++)
 338         pVidFunc->ModeSupport[i] = 0xff;
 339
 340     pVidFunc->ScanlineSupport     = 7;
 341     pVidFunc->NumberCharBlocks    = 0;
 342     pVidFunc->ActiveCharBlocks    = 0;
 343     pVidFunc->MiscFlags           = 0x8ff;
 344     pVidFunc->SavePointerFlags    = 0x3f;
 345
 346                                     /* FIXME: always real mode ? */
 347     pVidState->StaticFuncTable    = (0xf000<<16)+DOSMEM_GetBiosSysStructOffset(OFF_VIDEOFUNCTIONALITY);
 348     pVidState->VideoMode          = pBiosData->VideoMode; /* needs updates! */
 349     pVidState->NumberColumns      = pBiosData->VideoColumns; /* needs updates! */
 350     pVidState->RegenBufLen        = 0;
 351     pVidState->RegenBufAddr       = 0;
 352
 353     for (i = 0; i < 8; i++)
 354         pVidState->CursorPos[i] = 0;
 355
 356     pVidState->CursorType         = 0x0a0b;  /* start/end line */
 357     pVidState->ActivePage         = 0;
 358     pVidState->CRTCPort           = 0x3da;
 359     pVidState->Port3x8            = 0;
 360     pVidState->Port3x9            = 0;
 361     pVidState->NumberRows         = 23;     /* number of rows - 1 */
 362     pVidState->BytesPerChar       = 0x10;
 363     pVidState->DCCActive          = pBiosData->DisplayCombination;
 364     pVidState->DCCAlternate       = 0;
 365     pVidState->NumberColors       = 16;
 366     pVidState->NumberPages        = 1;
 367     pVidState->NumberScanlines    = 3; /* (0,1,2,3) = (200,350,400,480) */
 368     pVidState->CharBlockPrimary   = 0;
 369     pVidState->CharBlockSecondary = 0;
 370     pVidState->MiscFlags =
 371                            (pBiosData->VGASettings & 0x0f)
 372                          | ((pBiosData->ModeOptions & 1) << 4); /* cursor emulation */
 373     pVidState->NonVGASupport      = 0;
 374     pVidState->VideoMem           = (pBiosData->ModeOptions & 0x60 >> 5);
 375     pVidState->SavePointerState   = 0;
 376     pVidState->DisplayStatus      = 4;
 377
 378     /* SVGA structures */
 379     pVesaInfo->Signature          = *(DWORD*)"VESA";
 380     pVesaInfo->Major              = 2;
 381     pVesaInfo->Minor              = 0;
 382                                     /* FIXME: always real mode ? */
 383     pVesaInfo->StaticVendorString = (0xF000<<16)+DOSMEM_GetBiosSysStructOffset(OFF_VESASTRING);
 384     pVesaInfo->CapabilitiesFlags  = 0xfffffffd; /* FIXME: not really supported */
 385                                     /* FIXME: always real mode ? */
 386     pVesaInfo->StaticModeList     = (0xF000<<16)+DOSMEM_GetBiosSysStructOffset(OFF_VESAMODELIST);
 387
 388     strcpy(VesaString,ConstVesaString);
 389     memcpy(VesaModeList,ConstVesaModeList,sizeof(ConstVesaModeList));
 390
 391     /* BIOS date string */
 392     strcpy((char *)pBiosSys+0xfff5, "13/01/99");
 393
 394     /* BIOS ID */
 395     *(pBiosSys+0xfffe) = 0xfc;
 396 }
 397
 398 /***********************************************************************
 399  *           DOSMEM_InitCollateTable
 400  *
 401  * Initialises the collate table (character sorting, language dependent)
 402  */
 403 static void DOSMEM_InitCollateTable()
 404 {
 405         DWORD           x;
 406         unsigned char   *tbl;
 407         int             i;
 408
 409         x = GlobalDOSAlloc16(258);
 410         DOSMEM_CollateTable = MAKELONG(0,(x>>16));
 411         tbl = DOSMEM_MapRealToLinear(DOSMEM_CollateTable);
 412         *(WORD*)tbl     = 0x100;
 413         tbl += 2;
 414         for ( i = 0; i < 0x100; i++) *tbl++ = i;
 415 }
 416
 417 /***********************************************************************
 418  *           DOSMEM_InitErrorTable
 419  *
 420  * Initialises the error tables (DOS 5+)
 421  */
 422 static void DOSMEM_InitErrorTable()
 423 {
 424 #if 0  /* no longer used */
 425         DWORD           x;
 426         char            *call;
 427
 428         /* We will use a snippet of real mode code that calls */
 429         /* a WINE-only interrupt to handle moving the requested */
 430         /* message into the buffer... */
 431
 432         /* FIXME - There is still something wrong... */
 433
 434         /* FIXME - Find hex values for opcodes...
 435
 436            (On call, AX contains message number
 437                      DI contains 'offset' (??)
 438             Resturn, ES:DI points to counted string )
 439
 440            PUSH BX
 441            MOV BX, AX
 442            MOV AX, (arbitrary subfunction number)
 443            INT (WINE-only interrupt)
 444            POP BX
 445            RET
 446
 447         */
 448
 449         const int       code = 4;
 450         const int       buffer = 80;
 451         const int       SIZE_TO_ALLOCATE = code + buffer;
 452
 453         /* FIXME - Complete rewrite of the table system to save */
 454         /* precious DOS space. Now, we return the 0001:???? as */
 455         /* DOS 4+ (??, it seems to be the case in MS 7.10) treats that */
 456         /* as a special case and programs will use the alternate */
 457         /* interface (a farcall returned with INT 24 (AX = 0x122e, DL = */
 458         /* 0x08) which lets us have a smaller memory footprint anyway. */
 459
 460         x = GlobalDOSAlloc16(SIZE_TO_ALLOCATE);
 461
 462         DOSMEM_ErrorCall = MAKELONG(0,(x>>16));
 463         DOSMEM_ErrorBuffer = DOSMEM_ErrorCall + code;
 464
 465         call = DOSMEM_MapRealToLinear(DOSMEM_ErrorCall);
 466
 467         memset(call, 0, SIZE_TO_ALLOCATE);
 468 #endif
 469         /* FIXME - Copy assembly into buffer here */
 470 }
 471
 472 /***********************************************************************
 473  *           DOSMEM_InitMemory
 474  *
 475  * Initialises the DOS memory structures.
 476  */
 477 static void DOSMEM_InitMemory(void)
 478 {
 479    /* Low 64Kb are reserved for DOS/BIOS so the useable area starts at
 480     * 1000:0000 and ends at 9FFF:FFEF. */
 481
 482     dosmem_info*        info_block = DOSMEM_InfoBlock();
 483     dosmem_entry*       root_block = DOSMEM_RootBlock();
 484     dosmem_entry*       dm;
 485
 486     root_block->size = DOSMEM_MemoryTop() - (((char*)root_block) + sizeof(dosmem_entry));
 487
 488     info_block->blocks = 0;
 489     info_block->free = root_block->size;
 490
 491     dm = NEXT_BLOCK(root_block);
 492     dm->size = DM_BLOCK_TERMINAL;
 493     root_block->size |= DM_BLOCK_FREE
 494 #ifdef __DOSMEM_DEBUG__
 495                      | DM_BLOCK_DEBUG
 496 #endif
 497                      ;
 498 }
 499
 500 /**********************************************************************
 501  *              setup_dos_mem
 502  *
 503  * Setup the first megabyte for DOS memory access
 504  */
 505 static void setup_dos_mem( int dos_init )
 506 {
 507     int sys_offset = 0;
 508     int page_size = getpagesize();
 509     void *addr = wine_anon_mmap( (void *)page_size, 0x110000-page_size,
 510                                  PROT_READ | PROT_WRITE | PROT_EXEC, 0 );
 511     if (addr == (void *)page_size)  /* we got what we wanted */
 512     {
 513         /* now map from address 0 */
 514         addr = wine_anon_mmap( NULL, 0x110000, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED );
 515         if (addr)
 516         {
 517             ERR("MAP_FIXED failed at address 0 for DOS address space\n" );
 518             ExitProcess(1);
 519         }
 520
 521         /* inform the memory manager that there is a mapping here */
 522         VirtualAlloc( addr, 0x110000, MEM_RESERVE | MEM_SYSTEM, PAGE_EXECUTE_READWRITE );
 523
 524         /* protect the first 64K to catch NULL pointers */
 525         if (!dos_init)
 526         {
 527             VirtualProtect( addr, 0x10000, PAGE_NOACCESS, NULL );
 528             /* move the BIOS and ISR area from 0x00000 to 0xf0000 */
 529             sys_offset += 0xf0000;
 530         }
 531     }
 532     else
 533     {
 534         ERR("Cannot use first megabyte for DOS address space, please report\n" );
 535         if (dos_init) ExitProcess(1);
 536         /* allocate the DOS area somewhere else */
 537         addr = VirtualAlloc( NULL, 0x110000, MEM_COMMIT, PAGE_EXECUTE_READWRITE );
 538         if (!addr)
 539         {
 540             ERR( "Cannot allocate DOS memory\n" );
 541             ExitProcess(1);
 542         }
 543     }
 544     DOSMEM_dosmem = addr;
 545     DOSMEM_sysmem = (char*)addr + sys_offset;
 546 }
 547
 548
 549 /***********************************************************************
 550  *           DOSMEM_Init
 551  *
 552  * Create the dos memory segments, and store them into the KERNEL
 553  * exported values.
 554  */
 555 BOOL DOSMEM_Init(BOOL dos_init)
 556 {
 557     static int already_done, already_mapped;
 558
 559     if (!already_done)
 560     {
 561         setup_dos_mem( dos_init );
 562
 563         DOSMEM_0000H = GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_sysmem,
 564                                            0x10000, 0, WINE_LDT_FLAGS_DATA );
 565         DOSMEM_BiosDataSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_sysmem + 0x400,
 566                                                 0x100, 0, WINE_LDT_FLAGS_DATA );
 567         DOSMEM_BiosSysSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem+0xf0000,
 568                                                0x10000, 0, WINE_LDT_FLAGS_DATA );
 569         DOSMEM_FillBiosSegments();
 570         DOSMEM_FillIsrTable();
 571         DOSMEM_InitMemory();
 572         DOSMEM_InitCollateTable();
 573         DOSMEM_InitErrorTable();
 574         DOSMEM_InitDPMI();
 575         already_done = 1;
 576     }
 577     else if (dos_init && !already_mapped)
 578     {
 579         if (DOSMEM_dosmem)
 580         {
 581             ERR( "Needs access to the first megabyte for DOS mode\n" );
 582             ExitProcess(1);
 583         }
 584         MESSAGE( "Warning: unprotecting the first 64KB of memory to allow real-mode calls.\n"
 585                  "         NULL pointer accesses will no longer be caught.\n" );
 586         VirtualProtect( NULL, 0x10000, PAGE_EXECUTE_READWRITE, NULL );
 587         /* copy the BIOS and ISR area down */
 588         memcpy( DOSMEM_dosmem, DOSMEM_sysmem, 0x400 + 0x100 );
 589         DOSMEM_sysmem = DOSMEM_dosmem;
 590         SetSelectorBase( DOSMEM_0000H, 0 );
 591         SetSelectorBase( DOSMEM_BiosDataSeg, 0x400 );
 592         /* we may now need the actual interrupt stubs, and since we've just moved the
 593          * interrupt vector table away, we can fill the area with stubs instead... */
 594         DOSMEM_MakeIsrStubs();
 595         already_mapped = 1;
 596     }
 597     return TRUE;
 598 }
 599
 600
 601 /***********************************************************************
 602  *           DOSMEM_Tick
 603  *
 604  * Increment the BIOS tick counter. Called by timer signal handler.
 605  */
 606 void DOSMEM_Tick( WORD timer )
 607 {
 608     BIOSDATA *pBiosData = DOSMEM_BiosData();
 609     if (pBiosData) pBiosData->Ticks++;
 610 }
 611
 612 /***********************************************************************
 613  *           DOSMEM_GetBlock
 614  *
 615  * Carve a chunk of the DOS memory block (without selector).
 616  */
 617 LPVOID DOSMEM_GetBlock(UINT size, UINT16* pseg)
 618 {
 619    UINT          blocksize;
 620    char         *block = NULL;
 621    dosmem_info  *info_block = DOSMEM_InfoBlock();
 622    dosmem_entry *dm;
 623 #ifdef __DOSMEM_DEBUG_
 624    dosmem_entry *prev = NULL;
 625 #endif
 626
 627    if( size > info_block->free ) return NULL;
 628    dm = DOSMEM_RootBlock();
 629
 630    while (dm && dm->size != DM_BLOCK_TERMINAL)
 631    {
 632 #ifdef __DOSMEM_DEBUG__
 633        if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
 634        {
 635             WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)prev);
 636             return NULL;
 637        }
 638        prev = dm;
 639 #endif
 640        if( dm->size & DM_BLOCK_FREE )
 641        {
 642            dosmem_entry  *next = NEXT_BLOCK(dm);
 643
 644            while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
 645            {
 646                dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
 647                next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
 648                next = NEXT_BLOCK(dm);
 649            }
 650
 651            blocksize = dm->size & DM_BLOCK_MASK;
 652            if( blocksize >= size )
 653            {
 654                block = ((char*)dm) + sizeof(dosmem_entry);
 655                if( blocksize - size > 0x20 )
 656                {
 657                    /* split dm so that the next one stays
 658                     * paragraph-aligned (and dm loses free bit) */
 659
 660                    dm->size = (((size + 0xf + sizeof(dosmem_entry)) & ~0xf) -
 661                                               sizeof(dosmem_entry));
 662                    next = (dosmem_entry*)(((char*)dm) +
 663                            sizeof(dosmem_entry) + dm->size);
 664                    next->size = (blocksize - (dm->size +
 665                            sizeof(dosmem_entry))) | DM_BLOCK_FREE
 666 #ifdef __DOSMEM_DEBUG__
 667                                                   | DM_BLOCK_DEBUG
 668 #endif
 669                                                   ;
 670                } else dm->size &= DM_BLOCK_MASK;
 671
 672                info_block->blocks++;
 673                info_block->free -= dm->size;
 674                if( pseg ) *pseg = (block - DOSMEM_dosmem) >> 4;
 675 #ifdef __DOSMEM_DEBUG__
 676                dm->size |= DM_BLOCK_DEBUG;
 677 #endif
 678                break;
 679            }
 680            dm = next;
 681        }
 682        else dm = NEXT_BLOCK(dm);
 683    }
 684    return (LPVOID)block;
 685 }
 686
 687 /***********************************************************************
 688  *           DOSMEM_FreeBlock
 689  */
 690 BOOL DOSMEM_FreeBlock(void* ptr)
 691 {
 692    dosmem_info  *info_block = DOSMEM_InfoBlock();
 693
 694    if( ptr >= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry)) &&
 695        ptr < (void*)DOSMEM_MemoryTop() && !((((char*)ptr)
 696                   - DOSMEM_dosmem) & 0xf) )
 697    {
 698        dosmem_entry  *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
 699
 700        if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL))
 701 #ifdef __DOSMEM_DEBUG__
 702          && ((dm->size & DM_BLOCK_DEBUG) == DM_BLOCK_DEBUG )
 703 #endif
 704          )
 705        {
 706              info_block->blocks--;
 707              info_block->free += dm->size;
 708
 709              dm->size |= DM_BLOCK_FREE;
 710              return TRUE;
 711        }
 712    }
 713    return FALSE;
 714 }
 715
 716 /***********************************************************************
 717  *           DOSMEM_ResizeBlock
 718  */
 719 LPVOID DOSMEM_ResizeBlock(void* ptr, UINT size, UINT16* pseg)
 720 {
 721    char         *block = NULL;
 722    dosmem_info  *info_block = DOSMEM_InfoBlock();
 723
 724    if( ptr >= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry)) &&
 725        ptr < (void*)DOSMEM_MemoryTop() && !((((char*)ptr)
 726                   - DOSMEM_dosmem) & 0xf) )
 727    {
 728        dosmem_entry  *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
 729
 730        if( pseg ) *pseg = ((char*)ptr - DOSMEM_dosmem) >> 4;
 731
 732        if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL))
 733          )
 734        {
 735              dosmem_entry  *next = NEXT_BLOCK(dm);
 736              UINT blocksize, orgsize = dm->size & DM_BLOCK_MASK;
 737
 738              while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
 739              {
 740                  dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
 741                  next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
 742                  next = NEXT_BLOCK(dm);
 743              }
 744
 745              blocksize = dm->size & DM_BLOCK_MASK;
 746              if (blocksize >= size)
 747              {
 748                  block = ((char*)dm) + sizeof(dosmem_entry);
 749                  if( blocksize - size > 0x20 )
 750                  {
 751                      /* split dm so that the next one stays
 752                       * paragraph-aligned (and next gains free bit) */
 753
 754                      dm->size = (((size + 0xf + sizeof(dosmem_entry)) & ~0xf) -
 755                                                 sizeof(dosmem_entry));
 756                      next = (dosmem_entry*)(((char*)dm) +
 757                              sizeof(dosmem_entry) + dm->size);
 758                      next->size = (blocksize - (dm->size +
 759                              sizeof(dosmem_entry))) | DM_BLOCK_FREE
 760                                                     ;
 761                  } else dm->size &= DM_BLOCK_MASK;
 762
 763                  info_block->free += orgsize - dm->size;
 764              } else {
 765                  /* the collapse didn't help, try getting a new block */
 766                  block = DOSMEM_GetBlock(size, pseg);
 767                  if (block) {
 768                      /* we got one, copy the old data there (we do need to, right?) */
 769                      memcpy(block, ((char*)dm) + sizeof(dosmem_entry),
 770                                    (size<orgsize) ? size : orgsize);
 771                      /* free old block */
 772                      info_block->blocks--;
 773                      info_block->free += dm->size;
 774
 775                      dm->size |= DM_BLOCK_FREE;
 776                  } else {
 777                      /* and Bill Gates said 640K should be enough for everyone... */
 778
 779                      /* need to split original and collapsed blocks apart again,
 780                       * and free the collapsed blocks again, before exiting */
 781                      if( blocksize - orgsize > 0x20 )
 782                      {
 783                          /* split dm so that the next one stays
 784                           * paragraph-aligned (and next gains free bit) */
 785
 786                          dm->size = (((orgsize + 0xf + sizeof(dosmem_entry)) & ~0xf) -
 787                                                        sizeof(dosmem_entry));
 788                          next = (dosmem_entry*)(((char*)dm) +
 789                                  sizeof(dosmem_entry) + dm->size);
 790                          next->size = (blocksize - (dm->size +
 791                                  sizeof(dosmem_entry))) | DM_BLOCK_FREE
 792                                                         ;
 793                      } else dm->size &= DM_BLOCK_MASK;
 794                  }
 795              }
 796        }
 797    }
 798    return (LPVOID)block;
 799 }
 800
 801
 802 /***********************************************************************
 803  *           DOSMEM_Available
 804  */
 805 UINT DOSMEM_Available(void)
 806 {
 807    UINT          blocksize, available = 0;
 808    dosmem_entry *dm;
 809
 810    dm = DOSMEM_RootBlock();
 811
 812    while (dm && dm->size != DM_BLOCK_TERMINAL)
 813    {
 814 #ifdef __DOSMEM_DEBUG__
 815        if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
 816        {
 817             WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)prev);
 818             return NULL;
 819        }
 820        prev = dm;
 821 #endif
 822        if( dm->size & DM_BLOCK_FREE )
 823        {
 824            dosmem_entry  *next = NEXT_BLOCK(dm);
 825
 826            while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
 827            {
 828                dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
 829                next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
 830                next = NEXT_BLOCK(dm);
 831            }
 832
 833            blocksize = dm->size & DM_BLOCK_MASK;
 834            if ( blocksize > available ) available = blocksize;
 835            dm = next;
 836        }
 837        else dm = NEXT_BLOCK(dm);
 838    }
 839    return available;
 840 }
 841
 842
 843 /***********************************************************************
 844  *           DOSMEM_MapLinearToDos
 845  *
 846  * Linear address to the DOS address space.
 847  */
 848 UINT DOSMEM_MapLinearToDos(LPVOID ptr)
 849 {
 850     if (((char*)ptr >= DOSMEM_dosmem) &&
 851         ((char*)ptr < DOSMEM_dosmem + 0x100000))
 852           return (UINT)ptr - (UINT)DOSMEM_dosmem;
 853     return (UINT)ptr;
 854 }
 855
 856
 857 /***********************************************************************
 858  *           DOSMEM_MapDosToLinear
 859  *
 860  * DOS linear address to the linear address space.
 861  */
 862 LPVOID DOSMEM_MapDosToLinear(UINT ptr)
 863 {
 864     if (ptr < 0x100000) return (LPVOID)(ptr + (UINT)DOSMEM_dosmem);
 865     return (LPVOID)ptr;
 866 }
 867
 868
 869 /***********************************************************************
 870  *           DOSMEM_MapRealToLinear
 871  *
 872  * Real mode DOS address into a linear pointer
 873  */
 874 LPVOID DOSMEM_MapRealToLinear(DWORD x)
 875 {
 876    LPVOID       lin;
 877
 878    lin=DOSMEM_dosmem+(x&0xffff)+(((x&0xffff0000)>>16)*16);
 879    TRACE_(selector)("(0x%08lx) returns %p.\n", x, lin );
 880    return lin;
 881 }
 882
 883 /***********************************************************************
 884  *           DOSMEM_AllocSelector
 885  *
 886  * Allocates a protected mode selector for a realmode segment.
 887  */
 888 WORD DOSMEM_AllocSelector(WORD realsel)
 889 {
 890         HMODULE16 hModule = GetModuleHandle16("KERNEL");
 891         WORD    sel;
 892
 893         sel=GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_dosmem+realsel*16, 0x10000,
 894                                 hModule, WINE_LDT_FLAGS_DATA );
 895         TRACE_(selector)("(0x%04x) returns 0x%04x.\n", realsel,sel);
 896         return sel;
 897 }
 898