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 <time.h>
  34 #ifdef HAVE_SYS_TIME_H
  35 # include <sys/time.h>
  36 #endif
  37
  38 #include "winbase.h"
  39 #include "wine/winbase16.h"
  40
  41 #include "global.h"
  42 #include "selectors.h"
  43 #include "miscemu.h"
  44 #include "wine/debug.h"
  45
  46 WINE_DEFAULT_DEBUG_CHANNEL(dosmem);
  47 WINE_DECLARE_DEBUG_CHANNEL(selector);
  48
  49 WORD DOSMEM_0000H;        /* segment at 0:0 */
  50 WORD DOSMEM_BiosDataSeg;  /* BIOS data segment at 0x40:0 */
  51 WORD DOSMEM_BiosSysSeg;   /* BIOS ROM segment at 0xf000:0 */
  52
  53 DWORD DOSMEM_CollateTable;
  54
  55 /* use 2 low bits of 'size' for the housekeeping */
  56
  57 #define DM_BLOCK_DEBUG          0xABE00000
  58 #define DM_BLOCK_TERMINAL       0x00000001
  59 #define DM_BLOCK_FREE           0x00000002
  60 #define DM_BLOCK_MASK           0x001FFFFC
  61
  62 /*
  63 #define __DOSMEM_DEBUG__
  64  */
  65
  66 typedef struct {
  67    unsigned     size;
  68 } dosmem_entry;
  69
  70 typedef struct {
  71   unsigned      blocks;
  72   unsigned      free;
  73 } dosmem_info;
  74
  75 #define NEXT_BLOCK(block) \
  76         (dosmem_entry*)(((char*)(block)) + \
  77          sizeof(dosmem_entry) + ((block)->size & DM_BLOCK_MASK))
  78
  79 #define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */
  80 #define VM_STUB_SEGMENT 0xf000         /* BIOS segment */
  81
  82 /* DOS memory base */
  83 static char *DOSMEM_dosmem;
  84 /* DOS system base (for interrupt vector table and BIOS data area)
  85  * ...should in theory (i.e. Windows) be equal to DOSMEM_dosmem (NULL),
  86  * but is normally set to 0xf0000 in Wine to allow trapping of NULL pointers,
  87  * and only relocated to NULL when absolutely necessary */
  88 static char *DOSMEM_sysmem;
  89
  90 /* various real-mode code stubs */
  91 struct DPMI_segments DOSMEM_dpmi_segments;
  92
  93 /***********************************************************************
  94  *           DOSMEM_GetDPMISegments
  95  */
  96 const struct DPMI_segments *DOSMEM_GetDPMISegments(void)
  97 {
  98     return &DOSMEM_dpmi_segments;
  99 }
 100
 101 /***********************************************************************
 102  *           DOSMEM_MemoryTop
 103  *
 104  * Gets the DOS memory top.
 105  */
 106 static char *DOSMEM_MemoryTop(void)
 107 {
 108     return DOSMEM_dosmem+0x9FFFC; /* 640K */
 109 }
 110
 111 /***********************************************************************
 112  *           DOSMEM_InfoBlock
 113  *
 114  * Gets the DOS memory info block.
 115  */
 116 static dosmem_info *DOSMEM_InfoBlock(void)
 117 {
 118     return (dosmem_info*)(DOSMEM_dosmem+0x10000); /* 64K */
 119 }
 120
 121 /***********************************************************************
 122  *           DOSMEM_RootBlock
 123  *
 124  * Gets the DOS memory root block.
 125  */
 126 static dosmem_entry *DOSMEM_RootBlock(void)
 127 {
 128     /* first block has to be paragraph-aligned */
 129     return (dosmem_entry*)(((char*)DOSMEM_InfoBlock()) +
 130                            ((((sizeof(dosmem_info) + 0xf) & ~0xf) - sizeof(dosmem_entry))));
 131 }
 132
 133 /***********************************************************************
 134  *           DOSMEM_FillIsrTable
 135  *
 136  * Fill the interrupt table with fake BIOS calls to BIOSSEG (0xf000).
 137  *
 138  * NOTES:
 139  * Linux normally only traps INTs performed from or destined to BIOSSEG
 140  * for us to handle, if the int_revectored table is empty. Filling the
 141  * interrupt table with calls to INT stubs in BIOSSEG allows DOS programs
 142  * to hook interrupts, as well as use their familiar retf tricks to call
 143  * them, AND let Wine handle any unhooked interrupts transparently.
 144  */
 145 static void DOSMEM_FillIsrTable(void)
 146 {
 147     SEGPTR *isr = (SEGPTR*)DOSMEM_sysmem;
 148     int x;
 149
 150     for (x=0; x<256; x++) isr[x]=MAKESEGPTR(VM_STUB_SEGMENT,x*4);
 151 }
 152
 153 static void DOSMEM_MakeIsrStubs(void)
 154 {
 155     DWORD *stub = (DWORD*)(DOSMEM_dosmem + (VM_STUB_SEGMENT << 4));
 156     int x;
 157
 158     for (x=0; x<256; x++) stub[x]=VM_STUB(x);
 159 }
 160
 161 /***********************************************************************
 162  *           DOSMEM_InitDPMI
 163  *
 164  * Allocate the global DPMI RMCB wrapper.
 165  */
 166 static void DOSMEM_InitDPMI(void)
 167 {
 168     LPSTR ptr;
 169     int   i;
 170
 171     static const char wrap_code[]={
 172      0xCD,0x31, /* int $0x31 */
 173      0xCB       /* lret */
 174     };
 175
 176     static const char enter_xms[]=
 177     {
 178         /* XMS hookable entry point */
 179         0xEB,0x03,           /* jmp entry */
 180         0x90,0x90,0x90,      /* nop;nop;nop */
 181                              /* entry: */
 182         /* real entry point */
 183         /* for simplicity, we'll just use the same hook as DPMI below */
 184         0xCD,0x31,           /* int $0x31 */
 185         0xCB                 /* lret */
 186     };
 187
 188     static const char enter_pm[]=
 189     {
 190         0x50,                /* pushw %ax */
 191         0x52,                /* pushw %dx */
 192         0x55,                /* pushw %bp */
 193         0x89,0xE5,           /* movw %sp,%bp */
 194         /* get return CS */
 195         0x8B,0x56,0x08,      /* movw 8(%bp),%dx */
 196         /* just call int 31 here to get into protected mode... */
 197         /* it'll check whether it was called from dpmi_seg... */
 198         0xCD,0x31,           /* int $0x31 */
 199         /* we are now in the context of a 16-bit relay call */
 200         /* need to fixup our stack;
 201          * 16-bit relay return address will be lost, but we won't worry quite yet */
 202         0x8E,0xD0,           /* movw %ax,%ss */
 203         0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
 204         /* set return CS */
 205         0x89,0x56,0x08,      /* movw %dx,8(%bp) */
 206         0x5D,                /* popw %bp */
 207         0x5A,                /* popw %dx */
 208         0x58,                /* popw %ax */
 209         0xCB                 /* lret */
 210     };
 211
 212     ptr = DOSMEM_GetBlock( sizeof(wrap_code), &DOSMEM_dpmi_segments.wrap_seg );
 213     memcpy( ptr, wrap_code, sizeof(wrap_code) );
 214     ptr = DOSMEM_GetBlock( sizeof(enter_xms), &DOSMEM_dpmi_segments.xms_seg );
 215     memcpy( ptr, enter_xms, sizeof(enter_xms) );
 216     ptr = DOSMEM_GetBlock( sizeof(enter_pm), &DOSMEM_dpmi_segments.dpmi_seg );
 217     memcpy( ptr, enter_pm, sizeof(enter_pm) );
 218     DOSMEM_dpmi_segments.dpmi_sel = SELECTOR_AllocBlock( ptr, sizeof(enter_pm), WINE_LDT_FLAGS_CODE );
 219
 220     ptr = DOSMEM_GetBlock( 6 * 256, &DOSMEM_dpmi_segments.int48_seg );
 221     for(i=0; i<256; i++) {
 222         /*
 223          * Each 32-bit interrupt handler is 6 bytes:
 224          * 0xCD,<i>            = int <i> (nested 16-bit interrupt)
 225          * 0x66,0xCA,0x04,0x00 = ret 4   (32-bit far return and pop 4 bytes)
 226          */
 227         ptr[i * 6 + 0] = 0xCD;
 228         ptr[i * 6 + 1] = i;
 229         ptr[i * 6 + 2] = 0x66;
 230         ptr[i * 6 + 3] = 0xCA;
 231         ptr[i * 6 + 4] = 0x04;
 232         ptr[i * 6 + 5] = 0x00;
 233     }
 234     DOSMEM_dpmi_segments.int48_sel = SELECTOR_AllocBlock( ptr, 6 * 256, WINE_LDT_FLAGS_CODE );
 235 }
 236
 237 static BIOSDATA * DOSMEM_BiosData(void)
 238 {
 239     return (BIOSDATA *)(DOSMEM_sysmem + 0x400);
 240 }
 241
 242 /**********************************************************************
 243  *          DOSMEM_GetTicksSinceMidnight
 244  *
 245  * Return number of clock ticks since midnight.
 246  */
 247 static DWORD DOSMEM_GetTicksSinceMidnight(void)
 248 {
 249     struct tm *bdtime;
 250     struct timeval tvs;
 251     time_t seconds;
 252
 253     /* This should give us the (approximately) correct
 254      * 18.206 clock ticks per second since midnight.
 255      */
 256     gettimeofday( &tvs, NULL );
 257     seconds = tvs.tv_sec;
 258     bdtime = localtime( &seconds );
 259     return (((bdtime->tm_hour * 3600 + bdtime->tm_min * 60 +
 260               bdtime->tm_sec) * 18206) / 1000) +
 261                   (tvs.tv_usec / 54927);
 262 }
 263
 264 /***********************************************************************
 265  *           DOSMEM_FillBiosSegments
 266  *
 267  * Fill the BIOS data segment with dummy values.
 268  */
 269 static void DOSMEM_FillBiosSegments(void)
 270 {
 271     BYTE *pBiosSys = DOSMEM_dosmem + 0xf0000;
 272     BYTE *pBiosROMTable = pBiosSys+0xe6f5;
 273     BIOS_EXTRA *extra = (BIOS_EXTRA *)(DOSMEM_dosmem + (int)BIOS_EXTRA_PTR);
 274     BIOSDATA *pBiosData = DOSMEM_BiosData();
 275
 276     /* Supported VESA mode, see int10.c */
 277     WORD ConstVesaModeList[]={0x00,0x01,0x02,0x03,0x07,0x0D,0x0E,0x10,0x12,0x13,
 278                               0x100,0x101,0x102,0x103,0x104,0x105,0x106,0x107,0x10D,0x10E,
 279                               0x10F,0x110,0x111,0x112,0x113,0x114,0x115,0x116,0x117,0x118,
 280                               0x119,0x11A,0x11B,0xFFFF};
 281     char * ConstVesaString = "WINE SVGA BOARD";
 282     int i;
 283
 284     VIDEOFUNCTIONALITY *pVidFunc = &extra->vid_func;
 285     VIDEOSTATE *pVidState = &extra->vid_state;
 286     VESAINFO *pVesaInfo = &extra->vesa_info;
 287     char * VesaString = extra->vesa_string;
 288     WORD * VesaModeList = extra->vesa_modes;
 289
 290       /* Clear all unused values */
 291     memset( pBiosData, 0, sizeof(*pBiosData) );
 292     memset( pVidFunc,  0, sizeof(*pVidFunc ) );
 293     memset( pVidState, 0, sizeof(*pVidState) );
 294     memset( pVesaInfo, 0, sizeof(*pVesaInfo) );
 295
 296     /* FIXME: should check the number of configured drives and ports */
 297     pBiosData->Com1Addr             = 0x3f8;
 298     pBiosData->Com2Addr             = 0x2f8;
 299     pBiosData->Lpt1Addr             = 0x378;
 300     pBiosData->Lpt2Addr             = 0x278;
 301     pBiosData->InstalledHardware    = 0x5463;
 302     pBiosData->MemSize              = 640;
 303     pBiosData->NextKbdCharPtr       = 0x1e;
 304     pBiosData->FirstKbdCharPtr      = 0x1e;
 305     pBiosData->VideoMode            = 3;
 306     pBiosData->VideoColumns         = 80;
 307     pBiosData->VideoPageSize        = 80 * 25 * 2;
 308     pBiosData->VideoPageStartAddr   = 0xb800;
 309     pBiosData->VideoCtrlAddr        = 0x3d4;
 310     pBiosData->Ticks                = DOSMEM_GetTicksSinceMidnight();
 311     pBiosData->NbHardDisks          = 2;
 312     pBiosData->KbdBufferStart       = 0x1e;
 313     pBiosData->KbdBufferEnd         = 0x3e;
 314     pBiosData->RowsOnScreenMinus1   = 24;
 315     pBiosData->BytesPerChar         = 0x10;
 316     pBiosData->ModeOptions          = 0x64;
 317     pBiosData->FeatureBitsSwitches  = 0xf9;
 318     pBiosData->VGASettings          = 0x51;
 319     pBiosData->DisplayCombination   = 0x08;
 320     pBiosData->DiskDataRate         = 0;
 321
 322     /* fill ROM configuration table (values from Award) */
 323     *(pBiosROMTable+0x0)        = 0x08; /* number of bytes following LO */
 324     *(pBiosROMTable+0x1)        = 0x00; /* number of bytes following HI */
 325     *(pBiosROMTable+0x2)        = 0xfc; /* model */
 326     *(pBiosROMTable+0x3)        = 0x01; /* submodel */
 327     *(pBiosROMTable+0x4)        = 0x00; /* BIOS revision */
 328     *(pBiosROMTable+0x5)        = 0x74; /* feature byte 1 */
 329     *(pBiosROMTable+0x6)        = 0x00; /* feature byte 2 */
 330     *(pBiosROMTable+0x7)        = 0x00; /* feature byte 3 */
 331     *(pBiosROMTable+0x8)        = 0x00; /* feature byte 4 */
 332     *(pBiosROMTable+0x9)        = 0x00; /* feature byte 5 */
 333
 334
 335     for (i = 0; i < 7; i++)
 336         pVidFunc->ModeSupport[i] = 0xff;
 337
 338     pVidFunc->ScanlineSupport     = 7;
 339     pVidFunc->NumberCharBlocks    = 0;
 340     pVidFunc->ActiveCharBlocks    = 0;
 341     pVidFunc->MiscFlags           = 0x8ff;
 342     pVidFunc->SavePointerFlags    = 0x3f;
 343
 344                                     /* FIXME: always real mode ? */
 345     pVidState->StaticFuncTable    = BIOS_EXTRA_SEGPTR + offsetof(BIOS_EXTRA,vid_func);
 346     pVidState->VideoMode          = pBiosData->VideoMode; /* needs updates! */
 347     pVidState->NumberColumns      = pBiosData->VideoColumns; /* needs updates! */
 348     pVidState->RegenBufLen        = 0;
 349     pVidState->RegenBufAddr       = 0;
 350
 351     for (i = 0; i < 8; i++)
 352         pVidState->CursorPos[i] = 0;
 353
 354     pVidState->CursorType         = 0x0a0b;  /* start/end line */
 355     pVidState->ActivePage         = 0;
 356     pVidState->CRTCPort           = 0x3da;
 357     pVidState->Port3x8            = 0;
 358     pVidState->Port3x9            = 0;
 359     pVidState->NumberRows         = 23;     /* number of rows - 1 */
 360     pVidState->BytesPerChar       = 0x10;
 361     pVidState->DCCActive          = pBiosData->DisplayCombination;
 362     pVidState->DCCAlternate       = 0;
 363     pVidState->NumberColors       = 16;
 364     pVidState->NumberPages        = 1;
 365     pVidState->NumberScanlines    = 3; /* (0,1,2,3) = (200,350,400,480) */
 366     pVidState->CharBlockPrimary   = 0;
 367     pVidState->CharBlockSecondary = 0;
 368     pVidState->MiscFlags =
 369                            (pBiosData->VGASettings & 0x0f)
 370                          | ((pBiosData->ModeOptions & 1) << 4); /* cursor emulation */
 371     pVidState->NonVGASupport      = 0;
 372     pVidState->VideoMem           = (pBiosData->ModeOptions & 0x60 >> 5);
 373     pVidState->SavePointerState   = 0;
 374     pVidState->DisplayStatus      = 4;
 375
 376     /* SVGA structures */
 377     pVesaInfo->Signature          = *(DWORD*)"VESA";
 378     pVesaInfo->Major              = 2;
 379     pVesaInfo->Minor              = 0;
 380                                     /* FIXME: always real mode ? */
 381     pVesaInfo->StaticVendorString = BIOS_EXTRA_SEGPTR + offsetof(BIOS_EXTRA,vesa_string);
 382     pVesaInfo->CapabilitiesFlags  = 0xfffffffd; /* FIXME: not really supported */
 383                                     /* FIXME: always real mode ? */
 384     pVesaInfo->StaticModeList     = BIOS_EXTRA_SEGPTR + offsetof(BIOS_EXTRA,vesa_modes);
 385
 386     strcpy(VesaString,ConstVesaString);
 387     memcpy(VesaModeList,ConstVesaModeList,sizeof(ConstVesaModeList));
 388
 389     /* BIOS date string */
 390     strcpy((char *)pBiosSys+0xfff5, "13/01/99");
 391
 392     /* BIOS ID */
 393     *(pBiosSys+0xfffe) = 0xfc;
 394 }
 395
 396 /***********************************************************************
 397  *           DOSMEM_InitCollateTable
 398  *
 399  * Initialises the collate table (character sorting, language dependent)
 400  */
 401 static void DOSMEM_InitCollateTable()
 402 {
 403         DWORD           x;
 404         unsigned char   *tbl;
 405         int             i;
 406
 407         x = GlobalDOSAlloc16(258);
 408         DOSMEM_CollateTable = MAKELONG(0,(x>>16));
 409         tbl = DOSMEM_MapRealToLinear(DOSMEM_CollateTable);
 410         *(WORD*)tbl     = 0x100;
 411         tbl += 2;
 412         for ( i = 0; i < 0x100; i++) *tbl++ = i;
 413 }
 414
 415 /***********************************************************************
 416  *           DOSMEM_InitErrorTable
 417  *
 418  * Initialises the error tables (DOS 5+)
 419  */
 420 static void DOSMEM_InitErrorTable()
 421 {
 422 #if 0  /* no longer used */
 423         DWORD           x;
 424         char            *call;
 425
 426         /* We will use a snippet of real mode code that calls */
 427         /* a WINE-only interrupt to handle moving the requested */
 428         /* message into the buffer... */
 429
 430         /* FIXME - There is still something wrong... */
 431
 432         /* FIXME - Find hex values for opcodes...
 433
 434            (On call, AX contains message number
 435                      DI contains 'offset' (??)
 436             Resturn, ES:DI points to counted string )
 437
 438            PUSH BX
 439            MOV BX, AX
 440            MOV AX, (arbitrary subfunction number)
 441            INT (WINE-only interrupt)
 442            POP BX
 443            RET
 444
 445         */
 446
 447         const int       code = 4;
 448         const int       buffer = 80;
 449         const int       SIZE_TO_ALLOCATE = code + buffer;
 450
 451         /* FIXME - Complete rewrite of the table system to save */
 452         /* precious DOS space. Now, we return the 0001:???? as */
 453         /* DOS 4+ (??, it seems to be the case in MS 7.10) treats that */
 454         /* as a special case and programs will use the alternate */
 455         /* interface (a farcall returned with INT 24 (AX = 0x122e, DL = */
 456         /* 0x08) which lets us have a smaller memory footprint anyway. */
 457
 458         x = GlobalDOSAlloc16(SIZE_TO_ALLOCATE);
 459
 460         DOSMEM_ErrorCall = MAKELONG(0,(x>>16));
 461         DOSMEM_ErrorBuffer = DOSMEM_ErrorCall + code;
 462
 463         call = DOSMEM_MapRealToLinear(DOSMEM_ErrorCall);
 464
 465         memset(call, 0, SIZE_TO_ALLOCATE);
 466 #endif
 467         /* FIXME - Copy assembly into buffer here */
 468 }
 469
 470 /***********************************************************************
 471  *           DOSMEM_InitMemory
 472  *
 473  * Initialises the DOS memory structures.
 474  */
 475 static void DOSMEM_InitMemory(void)
 476 {
 477    /* Low 64Kb are reserved for DOS/BIOS so the useable area starts at
 478     * 1000:0000 and ends at 9FFF:FFEF. */
 479
 480     dosmem_info*        info_block = DOSMEM_InfoBlock();
 481     dosmem_entry*       root_block = DOSMEM_RootBlock();
 482     dosmem_entry*       dm;
 483
 484     root_block->size = DOSMEM_MemoryTop() - (((char*)root_block) + sizeof(dosmem_entry));
 485
 486     info_block->blocks = 0;
 487     info_block->free = root_block->size;
 488
 489     dm = NEXT_BLOCK(root_block);
 490     dm->size = DM_BLOCK_TERMINAL;
 491     root_block->size |= DM_BLOCK_FREE
 492 #ifdef __DOSMEM_DEBUG__
 493                      | DM_BLOCK_DEBUG
 494 #endif
 495                      ;
 496 }
 497
 498 /**********************************************************************
 499  *              setup_dos_mem
 500  *
 501  * Setup the first megabyte for DOS memory access
 502  */
 503 static void setup_dos_mem( int dos_init )
 504 {
 505     int sys_offset = 0;
 506     int page_size = getpagesize();
 507     void *addr = wine_anon_mmap( (void *)page_size, 0x110000-page_size,
 508                                  PROT_READ | PROT_WRITE | PROT_EXEC, 0 );
 509     if (addr == (void *)page_size)  /* we got what we wanted */
 510     {
 511         /* now map from address 0 */
 512         addr = wine_anon_mmap( NULL, 0x110000, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED );
 513         if (addr)
 514         {
 515             ERR("MAP_FIXED failed at address 0 for DOS address space\n" );
 516             ExitProcess(1);
 517         }
 518
 519         /* inform the memory manager that there is a mapping here */
 520         VirtualAlloc( addr, 0x110000, MEM_RESERVE | MEM_SYSTEM, PAGE_EXECUTE_READWRITE );
 521
 522         /* protect the first 64K to catch NULL pointers */
 523         if (!dos_init)
 524         {
 525             VirtualProtect( addr, 0x10000, PAGE_NOACCESS, NULL );
 526             /* move the BIOS and ISR area from 0x00000 to 0xf0000 */
 527             sys_offset += 0xf0000;
 528         }
 529     }
 530     else
 531     {
 532         ERR("Cannot use first megabyte for DOS address space, please report\n" );
 533         if (dos_init) ExitProcess(1);
 534         /* allocate the DOS area somewhere else */
 535         addr = VirtualAlloc( NULL, 0x110000, MEM_COMMIT, PAGE_EXECUTE_READWRITE );
 536         if (!addr)
 537         {
 538             ERR( "Cannot allocate DOS memory\n" );
 539             ExitProcess(1);
 540         }
 541     }
 542     DOSMEM_dosmem = addr;
 543     DOSMEM_sysmem = (char*)addr + sys_offset;
 544 }
 545
 546
 547 /***********************************************************************
 548  *           DOSMEM_Init
 549  *
 550  * Create the dos memory segments, and store them into the KERNEL
 551  * exported values.
 552  */
 553 BOOL DOSMEM_Init(BOOL dos_init)
 554 {
 555     static int already_done, already_mapped;
 556
 557     if (!already_done)
 558     {
 559         setup_dos_mem( dos_init );
 560
 561         DOSMEM_0000H = GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_sysmem,
 562                                            0x10000, 0, WINE_LDT_FLAGS_DATA );
 563         DOSMEM_BiosDataSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_sysmem + 0x400,
 564                                                 0x100, 0, WINE_LDT_FLAGS_DATA );
 565         DOSMEM_BiosSysSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem+0xf0000,
 566                                                0x10000, 0, WINE_LDT_FLAGS_DATA );
 567         DOSMEM_FillBiosSegments();
 568         DOSMEM_FillIsrTable();
 569         DOSMEM_InitMemory();
 570         DOSMEM_InitCollateTable();
 571         DOSMEM_InitErrorTable();
 572         DOSMEM_InitDPMI();
 573         already_done = 1;
 574     }
 575     else if (dos_init && !already_mapped)
 576     {
 577         if (DOSMEM_dosmem)
 578         {
 579             ERR( "Needs access to the first megabyte for DOS mode\n" );
 580             ExitProcess(1);
 581         }
 582         MESSAGE( "Warning: unprotecting the first 64KB of memory to allow real-mode calls.\n"
 583                  "         NULL pointer accesses will no longer be caught.\n" );
 584         VirtualProtect( NULL, 0x10000, PAGE_EXECUTE_READWRITE, NULL );
 585         /* copy the BIOS and ISR area down */
 586         memcpy( DOSMEM_dosmem, DOSMEM_sysmem, 0x400 + 0x100 );
 587         DOSMEM_sysmem = DOSMEM_dosmem;
 588         SetSelectorBase( DOSMEM_0000H, 0 );
 589         SetSelectorBase( DOSMEM_BiosDataSeg, 0x400 );
 590         /* we may now need the actual interrupt stubs, and since we've just moved the
 591          * interrupt vector table away, we can fill the area with stubs instead... */
 592         DOSMEM_MakeIsrStubs();
 593         already_mapped = 1;
 594     }
 595     return TRUE;
 596 }
 597
 598
 599 /***********************************************************************
 600  *           DOSMEM_Tick
 601  *
 602  * Increment the BIOS tick counter. Called by timer signal handler.
 603  */
 604 void DOSMEM_Tick( WORD timer )
 605 {
 606     BIOSDATA *pBiosData = DOSMEM_BiosData();
 607     if (pBiosData) pBiosData->Ticks++;
 608 }
 609
 610 /***********************************************************************
 611  *           DOSMEM_GetBlock
 612  *
 613  * Carve a chunk of the DOS memory block (without selector).
 614  */
 615 LPVOID DOSMEM_GetBlock(UINT size, UINT16* pseg)
 616 {
 617    UINT          blocksize;
 618    char         *block = NULL;
 619    dosmem_info  *info_block = DOSMEM_InfoBlock();
 620    dosmem_entry *dm;
 621 #ifdef __DOSMEM_DEBUG_
 622    dosmem_entry *prev = NULL;
 623 #endif
 624
 625    if( size > info_block->free ) return NULL;
 626    dm = DOSMEM_RootBlock();
 627
 628    while (dm && dm->size != DM_BLOCK_TERMINAL)
 629    {
 630 #ifdef __DOSMEM_DEBUG__
 631        if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
 632        {
 633             WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)prev);
 634             return NULL;
 635        }
 636        prev = dm;
 637 #endif
 638        if( dm->size & DM_BLOCK_FREE )
 639        {
 640            dosmem_entry  *next = NEXT_BLOCK(dm);
 641
 642            while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
 643            {
 644                dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
 645                next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
 646                next = NEXT_BLOCK(dm);
 647            }
 648
 649            blocksize = dm->size & DM_BLOCK_MASK;
 650            if( blocksize >= size )
 651            {
 652                block = ((char*)dm) + sizeof(dosmem_entry);
 653                if( blocksize - size > 0x20 )
 654                {
 655                    /* split dm so that the next one stays
 656                     * paragraph-aligned (and dm loses free bit) */
 657
 658                    dm->size = (((size + 0xf + sizeof(dosmem_entry)) & ~0xf) -
 659                                               sizeof(dosmem_entry));
 660                    next = (dosmem_entry*)(((char*)dm) +
 661                            sizeof(dosmem_entry) + dm->size);
 662                    next->size = (blocksize - (dm->size +
 663                            sizeof(dosmem_entry))) | DM_BLOCK_FREE
 664 #ifdef __DOSMEM_DEBUG__
 665                                                   | DM_BLOCK_DEBUG
 666 #endif
 667                                                   ;
 668                } else dm->size &= DM_BLOCK_MASK;
 669
 670                info_block->blocks++;
 671                info_block->free -= dm->size;
 672                if( pseg ) *pseg = (block - DOSMEM_dosmem) >> 4;
 673 #ifdef __DOSMEM_DEBUG__
 674                dm->size |= DM_BLOCK_DEBUG;
 675 #endif
 676                break;
 677            }
 678            dm = next;
 679        }
 680        else dm = NEXT_BLOCK(dm);
 681    }
 682    return (LPVOID)block;
 683 }
 684
 685 /***********************************************************************
 686  *           DOSMEM_FreeBlock
 687  */
 688 BOOL DOSMEM_FreeBlock(void* ptr)
 689 {
 690    dosmem_info  *info_block = DOSMEM_InfoBlock();
 691
 692    if( ptr >= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry)) &&
 693        ptr < (void*)DOSMEM_MemoryTop() && !((((char*)ptr)
 694                   - DOSMEM_dosmem) & 0xf) )
 695    {
 696        dosmem_entry  *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
 697
 698        if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL))
 699 #ifdef __DOSMEM_DEBUG__
 700          && ((dm->size & DM_BLOCK_DEBUG) == DM_BLOCK_DEBUG )
 701 #endif
 702          )
 703        {
 704              info_block->blocks--;
 705              info_block->free += dm->size;
 706
 707              dm->size |= DM_BLOCK_FREE;
 708              return TRUE;
 709        }
 710    }
 711    return FALSE;
 712 }
 713
 714 /***********************************************************************
 715  *           DOSMEM_ResizeBlock
 716  */
 717 LPVOID DOSMEM_ResizeBlock(void* ptr, UINT size, UINT16* pseg)
 718 {
 719    char         *block = NULL;
 720    dosmem_info  *info_block = DOSMEM_InfoBlock();
 721
 722    if( ptr >= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry)) &&
 723        ptr < (void*)DOSMEM_MemoryTop() && !((((char*)ptr)
 724                   - DOSMEM_dosmem) & 0xf) )
 725    {
 726        dosmem_entry  *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
 727
 728        if( pseg ) *pseg = ((char*)ptr - DOSMEM_dosmem) >> 4;
 729
 730        if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL))
 731          )
 732        {
 733              dosmem_entry  *next = NEXT_BLOCK(dm);
 734              UINT blocksize, orgsize = dm->size & DM_BLOCK_MASK;
 735
 736              while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
 737              {
 738                  dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
 739                  next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
 740                  next = NEXT_BLOCK(dm);
 741              }
 742
 743              blocksize = dm->size & DM_BLOCK_MASK;
 744              if (blocksize >= size)
 745              {
 746                  block = ((char*)dm) + sizeof(dosmem_entry);
 747                  if( blocksize - size > 0x20 )
 748                  {
 749                      /* split dm so that the next one stays
 750                       * paragraph-aligned (and next gains free bit) */
 751
 752                      dm->size = (((size + 0xf + sizeof(dosmem_entry)) & ~0xf) -
 753                                                 sizeof(dosmem_entry));
 754                      next = (dosmem_entry*)(((char*)dm) +
 755                              sizeof(dosmem_entry) + dm->size);
 756                      next->size = (blocksize - (dm->size +
 757                              sizeof(dosmem_entry))) | DM_BLOCK_FREE
 758                                                     ;
 759                  } else dm->size &= DM_BLOCK_MASK;
 760
 761                  info_block->free += orgsize - dm->size;
 762              } else {
 763                  /* the collapse didn't help, try getting a new block */
 764                  block = DOSMEM_GetBlock(size, pseg);
 765                  if (block) {
 766                      /* we got one, copy the old data there (we do need to, right?) */
 767                      memcpy(block, ((char*)dm) + sizeof(dosmem_entry),
 768                                    (size<orgsize) ? size : orgsize);
 769                      /* free old block */
 770                      info_block->blocks--;
 771                      info_block->free += dm->size;
 772
 773                      dm->size |= DM_BLOCK_FREE;
 774                  } else {
 775                      /* and Bill Gates said 640K should be enough for everyone... */
 776
 777                      /* need to split original and collapsed blocks apart again,
 778                       * and free the collapsed blocks again, before exiting */
 779                      if( blocksize - orgsize > 0x20 )
 780                      {
 781                          /* split dm so that the next one stays
 782                           * paragraph-aligned (and next gains free bit) */
 783
 784                          dm->size = (((orgsize + 0xf + sizeof(dosmem_entry)) & ~0xf) -
 785                                                        sizeof(dosmem_entry));
 786                          next = (dosmem_entry*)(((char*)dm) +
 787                                  sizeof(dosmem_entry) + dm->size);
 788                          next->size = (blocksize - (dm->size +
 789                                  sizeof(dosmem_entry))) | DM_BLOCK_FREE
 790                                                         ;
 791                      } else dm->size &= DM_BLOCK_MASK;
 792                  }
 793              }
 794        }
 795    }
 796    return (LPVOID)block;
 797 }
 798
 799
 800 /***********************************************************************
 801  *           DOSMEM_Available
 802  */
 803 UINT DOSMEM_Available(void)
 804 {
 805    UINT          blocksize, available = 0;
 806    dosmem_entry *dm;
 807
 808    dm = DOSMEM_RootBlock();
 809
 810    while (dm && dm->size != DM_BLOCK_TERMINAL)
 811    {
 812 #ifdef __DOSMEM_DEBUG__
 813        if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
 814        {
 815             WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)prev);
 816             return NULL;
 817        }
 818        prev = dm;
 819 #endif
 820        if( dm->size & DM_BLOCK_FREE )
 821        {
 822            dosmem_entry  *next = NEXT_BLOCK(dm);
 823
 824            while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
 825            {
 826                dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
 827                next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
 828                next = NEXT_BLOCK(dm);
 829            }
 830
 831            blocksize = dm->size & DM_BLOCK_MASK;
 832            if ( blocksize > available ) available = blocksize;
 833            dm = next;
 834        }
 835        else dm = NEXT_BLOCK(dm);
 836    }
 837    return available;
 838 }
 839
 840
 841 /***********************************************************************
 842  *           DOSMEM_MapLinearToDos
 843  *
 844  * Linear address to the DOS address space.
 845  */
 846 UINT DOSMEM_MapLinearToDos(LPVOID ptr)
 847 {
 848     if (((char*)ptr >= DOSMEM_dosmem) &&
 849         ((char*)ptr < DOSMEM_dosmem + 0x100000))
 850           return (UINT)ptr - (UINT)DOSMEM_dosmem;
 851     return (UINT)ptr;
 852 }
 853
 854
 855 /***********************************************************************
 856  *           DOSMEM_MapDosToLinear
 857  *
 858  * DOS linear address to the linear address space.
 859  */
 860 LPVOID DOSMEM_MapDosToLinear(UINT ptr)
 861 {
 862     if (ptr < 0x100000) return (LPVOID)(ptr + (UINT)DOSMEM_dosmem);
 863     return (LPVOID)ptr;
 864 }
 865
 866
 867 /***********************************************************************
 868  *           DOSMEM_MapRealToLinear
 869  *
 870  * Real mode DOS address into a linear pointer
 871  */
 872 LPVOID DOSMEM_MapRealToLinear(DWORD x)
 873 {
 874    LPVOID       lin;
 875
 876    lin=DOSMEM_dosmem+(x&0xffff)+(((x&0xffff0000)>>16)*16);
 877    TRACE_(selector)("(0x%08lx) returns %p.\n", x, lin );
 878    return lin;
 879 }
 880
 881 /***********************************************************************
 882  *           DOSMEM_AllocSelector
 883  *
 884  * Allocates a protected mode selector for a realmode segment.
 885  */
 886 WORD DOSMEM_AllocSelector(WORD realsel)
 887 {
 888         HMODULE16 hModule = GetModuleHandle16("KERNEL");
 889         WORD    sel;
 890
 891         sel=GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_dosmem+realsel*16, 0x10000,
 892                                 hModule, WINE_LDT_FLAGS_DATA );
 893         TRACE_(selector)("(0x%04x) returns 0x%04x.\n", realsel,sel);
 894         return sel;
 895 }