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 /* use 2 low bits of 'size' for the housekeeping */
  51
  52 #define DM_BLOCK_DEBUG          0xABE00000
  53 #define DM_BLOCK_TERMINAL       0x00000001
  54 #define DM_BLOCK_FREE           0x00000002
  55 #define DM_BLOCK_MASK           0x001FFFFC
  56
  57 /*
  58 #define __DOSMEM_DEBUG__
  59  */
  60
  61 typedef struct {
  62    unsigned     size;
  63 } dosmem_entry;
  64
  65 typedef struct {
  66   unsigned      blocks;
  67   unsigned      free;
  68 } dosmem_info;
  69
  70 #define NEXT_BLOCK(block) \
  71         (dosmem_entry*)(((char*)(block)) + \
  72          sizeof(dosmem_entry) + ((block)->size & DM_BLOCK_MASK))
  73
  74 #define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */
  75 #define VM_STUB_SEGMENT 0xf000         /* BIOS segment */
  76
  77 /* DOS memory base */
  78 static char *DOSMEM_dosmem;
  79 /* DOS system base (for interrupt vector table and BIOS data area)
  80  * ...should in theory (i.e. Windows) be equal to DOSMEM_dosmem (NULL),
  81  * but is normally set to 0xf0000 in Wine to allow trapping of NULL pointers,
  82  * and only relocated to NULL when absolutely necessary */
  83 static char *DOSMEM_sysmem;
  84
  85 /* various real-mode code stubs */
  86 struct DPMI_segments DOSMEM_dpmi_segments;
  87
  88 /***********************************************************************
  89  *           DOSMEM_GetDPMISegments
  90  */
  91 const struct DPMI_segments *DOSMEM_GetDPMISegments(void)
  92 {
  93     return &DOSMEM_dpmi_segments;
  94 }
  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_InfoBlock
 108  *
 109  * Gets the DOS memory info block.
 110  */
 111 static dosmem_info *DOSMEM_InfoBlock(void)
 112 {
 113     return (dosmem_info*)(DOSMEM_dosmem+0x10000); /* 64K */
 114 }
 115
 116 /***********************************************************************
 117  *           DOSMEM_RootBlock
 118  *
 119  * Gets the DOS memory root block.
 120  */
 121 static dosmem_entry *DOSMEM_RootBlock(void)
 122 {
 123     /* first block has to be paragraph-aligned */
 124     return (dosmem_entry*)(((char*)DOSMEM_InfoBlock()) +
 125                            ((((sizeof(dosmem_info) + 0xf) & ~0xf) - sizeof(dosmem_entry))));
 126 }
 127
 128 /***********************************************************************
 129  *           DOSMEM_FillIsrTable
 130  *
 131  * Fill the interrupt table with fake BIOS calls to BIOSSEG (0xf000).
 132  *
 133  * NOTES:
 134  * Linux normally only traps INTs performed from or destined to BIOSSEG
 135  * for us to handle, if the int_revectored table is empty. Filling the
 136  * interrupt table with calls to INT stubs in BIOSSEG allows DOS programs
 137  * to hook interrupts, as well as use their familiar retf tricks to call
 138  * them, AND let Wine handle any unhooked interrupts transparently.
 139  */
 140 static void DOSMEM_FillIsrTable(void)
 141 {
 142     SEGPTR *isr = (SEGPTR*)DOSMEM_sysmem;
 143     int x;
 144
 145     for (x=0; x<256; x++) isr[x]=MAKESEGPTR(VM_STUB_SEGMENT,x*4);
 146 }
 147
 148 static void DOSMEM_MakeIsrStubs(void)
 149 {
 150     DWORD *stub = (DWORD*)(DOSMEM_dosmem + (VM_STUB_SEGMENT << 4));
 151     int x;
 152
 153     for (x=0; x<256; x++) stub[x]=VM_STUB(x);
 154 }
 155
 156 /***********************************************************************
 157  *           DOSMEM_InitDPMI
 158  *
 159  * Allocate the global DPMI RMCB wrapper.
 160  */
 161 static void DOSMEM_InitDPMI(void)
 162 {
 163     LPSTR ptr;
 164     int   i;
 165
 166     static const char wrap_code[]={
 167      0xCD,0x31, /* int $0x31 */
 168      0xCB       /* lret */
 169     };
 170
 171     static const char enter_xms[]=
 172     {
 173         /* XMS hookable entry point */
 174         0xEB,0x03,           /* jmp entry */
 175         0x90,0x90,0x90,      /* nop;nop;nop */
 176                              /* entry: */
 177         /* real entry point */
 178         /* for simplicity, we'll just use the same hook as DPMI below */
 179         0xCD,0x31,           /* int $0x31 */
 180         0xCB                 /* lret */
 181     };
 182
 183     static const char enter_pm[]=
 184     {
 185         0x50,                /* pushw %ax */
 186         0x52,                /* pushw %dx */
 187         0x55,                /* pushw %bp */
 188         0x89,0xE5,           /* movw %sp,%bp */
 189         /* get return CS */
 190         0x8B,0x56,0x08,      /* movw 8(%bp),%dx */
 191         /* just call int 31 here to get into protected mode... */
 192         /* it'll check whether it was called from dpmi_seg... */
 193         0xCD,0x31,           /* int $0x31 */
 194         /* we are now in the context of a 16-bit relay call */
 195         /* need to fixup our stack;
 196          * 16-bit relay return address will be lost, but we won't worry quite yet */
 197         0x8E,0xD0,           /* movw %ax,%ss */
 198         0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
 199         /* set return CS */
 200         0x89,0x56,0x08,      /* movw %dx,8(%bp) */
 201         0x5D,                /* popw %bp */
 202         0x5A,                /* popw %dx */
 203         0x58,                /* popw %ax */
 204         0xCB                 /* lret */
 205     };
 206
 207     ptr = DOSMEM_GetBlock( sizeof(wrap_code), &DOSMEM_dpmi_segments.wrap_seg );
 208     memcpy( ptr, wrap_code, sizeof(wrap_code) );
 209     ptr = DOSMEM_GetBlock( sizeof(enter_xms), &DOSMEM_dpmi_segments.xms_seg );
 210     memcpy( ptr, enter_xms, sizeof(enter_xms) );
 211     ptr = DOSMEM_GetBlock( sizeof(enter_pm), &DOSMEM_dpmi_segments.dpmi_seg );
 212     memcpy( ptr, enter_pm, sizeof(enter_pm) );
 213     DOSMEM_dpmi_segments.dpmi_sel = SELECTOR_AllocBlock( ptr, sizeof(enter_pm), WINE_LDT_FLAGS_CODE );
 214
 215     ptr = DOSMEM_GetBlock( 6 * 256, &DOSMEM_dpmi_segments.int48_seg );
 216     for(i=0; i<256; i++) {
 217         /*
 218          * Each 32-bit interrupt handler is 6 bytes:
 219          * 0xCD,<i>            = int <i> (nested 16-bit interrupt)
 220          * 0x66,0xCA,0x04,0x00 = ret 4   (32-bit far return and pop 4 bytes)
 221          */
 222         ptr[i * 6 + 0] = 0xCD;
 223         ptr[i * 6 + 1] = i;
 224         ptr[i * 6 + 2] = 0x66;
 225         ptr[i * 6 + 3] = 0xCA;
 226         ptr[i * 6 + 4] = 0x04;
 227         ptr[i * 6 + 5] = 0x00;
 228     }
 229     DOSMEM_dpmi_segments.int48_sel = SELECTOR_AllocBlock( ptr, 6 * 256, WINE_LDT_FLAGS_CODE );
 230 }
 231
 232 static BIOSDATA * DOSMEM_BiosData(void)
 233 {
 234     return (BIOSDATA *)(DOSMEM_sysmem + 0x400);
 235 }
 236
 237
 238 /***********************************************************************
 239  *           DOSMEM_FillBiosSegments
 240  *
 241  * Fill the BIOS data segment with dummy values.
 242  */
 243 static void DOSMEM_FillBiosSegments(void)
 244 {
 245     BYTE *pBiosSys = DOSMEM_dosmem + 0xf0000;
 246     BYTE *pBiosROMTable = pBiosSys+0xe6f5;
 247     BIOS_EXTRA *extra = (BIOS_EXTRA *)(DOSMEM_dosmem + (int)BIOS_EXTRA_PTR);
 248     BIOSDATA *pBiosData = DOSMEM_BiosData();
 249
 250     /* Supported VESA mode, see int10.c */
 251     WORD ConstVesaModeList[]={0x00,0x01,0x02,0x03,0x07,0x0D,0x0E,0x10,0x12,0x13,
 252                               0x100,0x101,0x102,0x103,0x104,0x105,0x106,0x107,0x10D,0x10E,
 253                               0x10F,0x110,0x111,0x112,0x113,0x114,0x115,0x116,0x117,0x118,
 254                               0x119,0x11A,0x11B,0xFFFF};
 255     char * ConstVesaString = "WINE SVGA BOARD";
 256     int i;
 257
 258     VIDEOFUNCTIONALITY *pVidFunc = &extra->vid_func;
 259     VIDEOSTATE *pVidState = &extra->vid_state;
 260     VESAINFO *pVesaInfo = &extra->vesa_info;
 261     char * VesaString = extra->vesa_string;
 262     WORD * VesaModeList = extra->vesa_modes;
 263
 264       /* Clear all unused values */
 265     memset( pBiosData, 0, sizeof(*pBiosData) );
 266     memset( pVidFunc,  0, sizeof(*pVidFunc ) );
 267     memset( pVidState, 0, sizeof(*pVidState) );
 268     memset( pVesaInfo, 0, sizeof(*pVesaInfo) );
 269
 270     /* FIXME: should check the number of configured drives and ports */
 271     pBiosData->Com1Addr             = 0x3f8;
 272     pBiosData->Com2Addr             = 0x2f8;
 273     pBiosData->Lpt1Addr             = 0x378;
 274     pBiosData->Lpt2Addr             = 0x278;
 275     pBiosData->InstalledHardware    = 0x5463;
 276     pBiosData->MemSize              = 640;
 277     pBiosData->NextKbdCharPtr       = 0x1e;
 278     pBiosData->FirstKbdCharPtr      = 0x1e;
 279     pBiosData->VideoMode            = 3;
 280     pBiosData->VideoColumns         = 80;
 281     pBiosData->VideoPageSize        = 80 * 25 * 2;
 282     pBiosData->VideoPageStartAddr   = 0xb800;
 283     pBiosData->VideoCtrlAddr        = 0x3d4;
 284     pBiosData->Ticks                = INT1A_GetTicksSinceMidnight();
 285     pBiosData->NbHardDisks          = 2;
 286     pBiosData->KbdBufferStart       = 0x1e;
 287     pBiosData->KbdBufferEnd         = 0x3e;
 288     pBiosData->RowsOnScreenMinus1   = 24;
 289     pBiosData->BytesPerChar         = 0x10;
 290     pBiosData->ModeOptions          = 0x64;
 291     pBiosData->FeatureBitsSwitches  = 0xf9;
 292     pBiosData->VGASettings          = 0x51;
 293     pBiosData->DisplayCombination   = 0x08;
 294     pBiosData->DiskDataRate         = 0;
 295
 296     /* fill ROM configuration table (values from Award) */
 297     *(pBiosROMTable+0x0)        = 0x08; /* number of bytes following LO */
 298     *(pBiosROMTable+0x1)        = 0x00; /* number of bytes following HI */
 299     *(pBiosROMTable+0x2)        = 0xfc; /* model */
 300     *(pBiosROMTable+0x3)        = 0x01; /* submodel */
 301     *(pBiosROMTable+0x4)        = 0x00; /* BIOS revision */
 302     *(pBiosROMTable+0x5)        = 0x74; /* feature byte 1 */
 303     *(pBiosROMTable+0x6)        = 0x00; /* feature byte 2 */
 304     *(pBiosROMTable+0x7)        = 0x00; /* feature byte 3 */
 305     *(pBiosROMTable+0x8)        = 0x00; /* feature byte 4 */
 306     *(pBiosROMTable+0x9)        = 0x00; /* feature byte 5 */
 307
 308
 309     for (i = 0; i < 7; i++)
 310         pVidFunc->ModeSupport[i] = 0xff;
 311
 312     pVidFunc->ScanlineSupport     = 7;
 313     pVidFunc->NumberCharBlocks    = 0;
 314     pVidFunc->ActiveCharBlocks    = 0;
 315     pVidFunc->MiscFlags           = 0x8ff;
 316     pVidFunc->SavePointerFlags    = 0x3f;
 317
 318                                     /* FIXME: always real mode ? */
 319     pVidState->StaticFuncTable    = BIOS_EXTRA_SEGPTR + offsetof(BIOS_EXTRA,vid_func);
 320     pVidState->VideoMode          = pBiosData->VideoMode; /* needs updates! */
 321     pVidState->NumberColumns      = pBiosData->VideoColumns; /* needs updates! */
 322     pVidState->RegenBufLen        = 0;
 323     pVidState->RegenBufAddr       = 0;
 324
 325     for (i = 0; i < 8; i++)
 326         pVidState->CursorPos[i] = 0;
 327
 328     pVidState->CursorType         = 0x0a0b;  /* start/end line */
 329     pVidState->ActivePage         = 0;
 330     pVidState->CRTCPort           = 0x3da;
 331     pVidState->Port3x8            = 0;
 332     pVidState->Port3x9            = 0;
 333     pVidState->NumberRows         = 23;     /* number of rows - 1 */
 334     pVidState->BytesPerChar       = 0x10;
 335     pVidState->DCCActive          = pBiosData->DisplayCombination;
 336     pVidState->DCCAlternate       = 0;
 337     pVidState->NumberColors       = 16;
 338     pVidState->NumberPages        = 1;
 339     pVidState->NumberScanlines    = 3; /* (0,1,2,3) = (200,350,400,480) */
 340     pVidState->CharBlockPrimary   = 0;
 341     pVidState->CharBlockSecondary = 0;
 342     pVidState->MiscFlags =
 343                            (pBiosData->VGASettings & 0x0f)
 344                          | ((pBiosData->ModeOptions & 1) << 4); /* cursor emulation */
 345     pVidState->NonVGASupport      = 0;
 346     pVidState->VideoMem           = (pBiosData->ModeOptions & 0x60 >> 5);
 347     pVidState->SavePointerState   = 0;
 348     pVidState->DisplayStatus      = 4;
 349
 350     /* SVGA structures */
 351     pVesaInfo->Signature          = *(DWORD*)"VESA";
 352     pVesaInfo->Major              = 2;
 353     pVesaInfo->Minor              = 0;
 354                                     /* FIXME: always real mode ? */
 355     pVesaInfo->StaticVendorString = BIOS_EXTRA_SEGPTR + offsetof(BIOS_EXTRA,vesa_string);
 356     pVesaInfo->CapabilitiesFlags  = 0xfffffffd; /* FIXME: not really supported */
 357                                     /* FIXME: always real mode ? */
 358     pVesaInfo->StaticModeList     = BIOS_EXTRA_SEGPTR + offsetof(BIOS_EXTRA,vesa_modes);
 359
 360     strcpy(VesaString,ConstVesaString);
 361     memcpy(VesaModeList,ConstVesaModeList,sizeof(ConstVesaModeList));
 362
 363     /* BIOS date string */
 364     strcpy((char *)pBiosSys+0xfff5, "13/01/99");
 365
 366     /* BIOS ID */
 367     *(pBiosSys+0xfffe) = 0xfc;
 368 }
 369
 370 /***********************************************************************
 371  *           DOSMEM_InitCollateTable
 372  *
 373  * Initialises the collate table (character sorting, language dependent)
 374  */
 375 static void DOSMEM_InitCollateTable()
 376 {
 377         DWORD           x;
 378         unsigned char   *tbl;
 379         int             i;
 380
 381         x = GlobalDOSAlloc16(258);
 382         DOSMEM_CollateTable = MAKELONG(0,(x>>16));
 383         tbl = DOSMEM_MapRealToLinear(DOSMEM_CollateTable);
 384         *(WORD*)tbl     = 0x100;
 385         tbl += 2;
 386         for ( i = 0; i < 0x100; i++) *tbl++ = i;
 387 }
 388
 389 /***********************************************************************
 390  *           DOSMEM_InitErrorTable
 391  *
 392  * Initialises the error tables (DOS 5+)
 393  */
 394 static void DOSMEM_InitErrorTable()
 395 {
 396 #if 0  /* no longer used */
 397         DWORD           x;
 398         char            *call;
 399
 400         /* We will use a snippet of real mode code that calls */
 401         /* a WINE-only interrupt to handle moving the requested */
 402         /* message into the buffer... */
 403
 404         /* FIXME - There is still something wrong... */
 405
 406         /* FIXME - Find hex values for opcodes...
 407
 408            (On call, AX contains message number
 409                      DI contains 'offset' (??)
 410             Resturn, ES:DI points to counted string )
 411
 412            PUSH BX
 413            MOV BX, AX
 414            MOV AX, (arbitrary subfunction number)
 415            INT (WINE-only interrupt)
 416            POP BX
 417            RET
 418
 419         */
 420
 421         const int       code = 4;
 422         const int       buffer = 80;
 423         const int       SIZE_TO_ALLOCATE = code + buffer;
 424
 425         /* FIXME - Complete rewrite of the table system to save */
 426         /* precious DOS space. Now, we return the 0001:???? as */
 427         /* DOS 4+ (??, it seems to be the case in MS 7.10) treats that */
 428         /* as a special case and programs will use the alternate */
 429         /* interface (a farcall returned with INT 24 (AX = 0x122e, DL = */
 430         /* 0x08) which lets us have a smaller memory footprint anyway. */
 431
 432         x = GlobalDOSAlloc16(SIZE_TO_ALLOCATE);
 433
 434         DOSMEM_ErrorCall = MAKELONG(0,(x>>16));
 435         DOSMEM_ErrorBuffer = DOSMEM_ErrorCall + code;
 436
 437         call = DOSMEM_MapRealToLinear(DOSMEM_ErrorCall);
 438
 439         memset(call, 0, SIZE_TO_ALLOCATE);
 440 #endif
 441         /* FIXME - Copy assembly into buffer here */
 442 }
 443
 444 /***********************************************************************
 445  *           DOSMEM_InitMemory
 446  *
 447  * Initialises the DOS memory structures.
 448  */
 449 static void DOSMEM_InitMemory(void)
 450 {
 451    /* Low 64Kb are reserved for DOS/BIOS so the useable area starts at
 452     * 1000:0000 and ends at 9FFF:FFEF. */
 453
 454     dosmem_info*        info_block = DOSMEM_InfoBlock();
 455     dosmem_entry*       root_block = DOSMEM_RootBlock();
 456     dosmem_entry*       dm;
 457
 458     root_block->size = DOSMEM_MemoryTop() - (((char*)root_block) + sizeof(dosmem_entry));
 459
 460     info_block->blocks = 0;
 461     info_block->free = root_block->size;
 462
 463     dm = NEXT_BLOCK(root_block);
 464     dm->size = DM_BLOCK_TERMINAL;
 465     root_block->size |= DM_BLOCK_FREE
 466 #ifdef __DOSMEM_DEBUG__
 467                      | DM_BLOCK_DEBUG
 468 #endif
 469                      ;
 470 }
 471
 472 /**********************************************************************
 473  *              setup_dos_mem
 474  *
 475  * Setup the first megabyte for DOS memory access
 476  */
 477 static void setup_dos_mem( int dos_init )
 478 {
 479     int sys_offset = 0;
 480     int page_size = getpagesize();
 481     void *addr = wine_anon_mmap( (void *)page_size, 0x110000-page_size,
 482                                  PROT_READ | PROT_WRITE | PROT_EXEC, 0 );
 483     if (addr == (void *)page_size)  /* we got what we wanted */
 484     {
 485         /* now map from address 0 */
 486         addr = wine_anon_mmap( NULL, 0x110000, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED );
 487         if (addr)
 488         {
 489             ERR("MAP_FIXED failed at address 0 for DOS address space\n" );
 490             ExitProcess(1);
 491         }
 492
 493         /* inform the memory manager that there is a mapping here */
 494         VirtualAlloc( addr, 0x110000, MEM_RESERVE | MEM_SYSTEM, PAGE_EXECUTE_READWRITE );
 495
 496         /* protect the first 64K to catch NULL pointers */
 497         if (!dos_init)
 498         {
 499             VirtualProtect( addr, 0x10000, PAGE_NOACCESS, NULL );
 500             /* move the BIOS and ISR area from 0x00000 to 0xf0000 */
 501             sys_offset += 0xf0000;
 502         }
 503     }
 504     else
 505     {
 506         ERR("Cannot use first megabyte for DOS address space, please report\n" );
 507         if (dos_init) ExitProcess(1);
 508         /* allocate the DOS area somewhere else */
 509         addr = VirtualAlloc( NULL, 0x110000, MEM_COMMIT, PAGE_EXECUTE_READWRITE );
 510         if (!addr)
 511         {
 512             ERR( "Cannot allocate DOS memory\n" );
 513             ExitProcess(1);
 514         }
 515     }
 516     DOSMEM_dosmem = addr;
 517     DOSMEM_sysmem = (char*)addr + sys_offset;
 518 }
 519
 520
 521 /***********************************************************************
 522  *           DOSMEM_Init
 523  *
 524  * Create the dos memory segments, and store them into the KERNEL
 525  * exported values.
 526  */
 527 BOOL DOSMEM_Init(BOOL dos_init)
 528 {
 529     static int already_done, already_mapped;
 530
 531     if (!already_done)
 532     {
 533         setup_dos_mem( dos_init );
 534
 535         DOSMEM_0000H = GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_sysmem,
 536                                            0x10000, 0, WINE_LDT_FLAGS_DATA );
 537         DOSMEM_BiosDataSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_sysmem + 0x400,
 538                                                 0x100, 0, WINE_LDT_FLAGS_DATA );
 539         DOSMEM_BiosSysSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem+0xf0000,
 540                                                0x10000, 0, WINE_LDT_FLAGS_DATA );
 541         DOSMEM_FillBiosSegments();
 542         DOSMEM_FillIsrTable();
 543         DOSMEM_InitMemory();
 544         DOSMEM_InitCollateTable();
 545         DOSMEM_InitErrorTable();
 546         DOSMEM_InitDPMI();
 547         already_done = 1;
 548     }
 549     else if (dos_init && !already_mapped)
 550     {
 551         if (DOSMEM_dosmem)
 552         {
 553             ERR( "Needs access to the first megabyte for DOS mode\n" );
 554             ExitProcess(1);
 555         }
 556         MESSAGE( "Warning: unprotecting the first 64KB of memory to allow real-mode calls.\n"
 557                  "         NULL pointer accesses will no longer be caught.\n" );
 558         VirtualProtect( NULL, 0x10000, PAGE_EXECUTE_READWRITE, NULL );
 559         /* copy the BIOS and ISR area down */
 560         memcpy( DOSMEM_dosmem, DOSMEM_sysmem, 0x400 + 0x100 );
 561         DOSMEM_sysmem = DOSMEM_dosmem;
 562         SetSelectorBase( DOSMEM_0000H, 0 );
 563         SetSelectorBase( DOSMEM_BiosDataSeg, 0x400 );
 564         /* we may now need the actual interrupt stubs, and since we've just moved the
 565          * interrupt vector table away, we can fill the area with stubs instead... */
 566         DOSMEM_MakeIsrStubs();
 567         already_mapped = 1;
 568     }
 569     return TRUE;
 570 }
 571
 572
 573 /***********************************************************************
 574  *           DOSMEM_Tick
 575  *
 576  * Increment the BIOS tick counter. Called by timer signal handler.
 577  */
 578 void DOSMEM_Tick( WORD timer )
 579 {
 580     BIOSDATA *pBiosData = DOSMEM_BiosData();
 581     if (pBiosData) pBiosData->Ticks++;
 582 }
 583
 584 /***********************************************************************
 585  *           DOSMEM_GetBlock
 586  *
 587  * Carve a chunk of the DOS memory block (without selector).
 588  */
 589 LPVOID DOSMEM_GetBlock(UINT size, UINT16* pseg)
 590 {
 591    UINT          blocksize;
 592    char         *block = NULL;
 593    dosmem_info  *info_block = DOSMEM_InfoBlock();
 594    dosmem_entry *dm;
 595 #ifdef __DOSMEM_DEBUG_
 596    dosmem_entry *prev = NULL;
 597 #endif
 598
 599    if( size > info_block->free ) return NULL;
 600    dm = DOSMEM_RootBlock();
 601
 602    while (dm && dm->size != DM_BLOCK_TERMINAL)
 603    {
 604 #ifdef __DOSMEM_DEBUG__
 605        if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
 606        {
 607             WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)prev);
 608             return NULL;
 609        }
 610        prev = dm;
 611 #endif
 612        if( dm->size & DM_BLOCK_FREE )
 613        {
 614            dosmem_entry  *next = NEXT_BLOCK(dm);
 615
 616            while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
 617            {
 618                dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
 619                next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
 620                next = NEXT_BLOCK(dm);
 621            }
 622
 623            blocksize = dm->size & DM_BLOCK_MASK;
 624            if( blocksize >= size )
 625            {
 626                block = ((char*)dm) + sizeof(dosmem_entry);
 627                if( blocksize - size > 0x20 )
 628                {
 629                    /* split dm so that the next one stays
 630                     * paragraph-aligned (and dm loses free bit) */
 631
 632                    dm->size = (((size + 0xf + sizeof(dosmem_entry)) & ~0xf) -
 633                                               sizeof(dosmem_entry));
 634                    next = (dosmem_entry*)(((char*)dm) +
 635                            sizeof(dosmem_entry) + dm->size);
 636                    next->size = (blocksize - (dm->size +
 637                            sizeof(dosmem_entry))) | DM_BLOCK_FREE
 638 #ifdef __DOSMEM_DEBUG__
 639                                                   | DM_BLOCK_DEBUG
 640 #endif
 641                                                   ;
 642                } else dm->size &= DM_BLOCK_MASK;
 643
 644                info_block->blocks++;
 645                info_block->free -= dm->size;
 646                if( pseg ) *pseg = (block - DOSMEM_dosmem) >> 4;
 647 #ifdef __DOSMEM_DEBUG__
 648                dm->size |= DM_BLOCK_DEBUG;
 649 #endif
 650                break;
 651            }
 652            dm = next;
 653        }
 654        else dm = NEXT_BLOCK(dm);
 655    }
 656    return (LPVOID)block;
 657 }
 658
 659 /***********************************************************************
 660  *           DOSMEM_FreeBlock
 661  */
 662 BOOL DOSMEM_FreeBlock(void* ptr)
 663 {
 664    dosmem_info  *info_block = DOSMEM_InfoBlock();
 665
 666    if( ptr >= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry)) &&
 667        ptr < (void*)DOSMEM_MemoryTop() && !((((char*)ptr)
 668                   - DOSMEM_dosmem) & 0xf) )
 669    {
 670        dosmem_entry  *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
 671
 672        if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL))
 673 #ifdef __DOSMEM_DEBUG__
 674          && ((dm->size & DM_BLOCK_DEBUG) == DM_BLOCK_DEBUG )
 675 #endif
 676          )
 677        {
 678              info_block->blocks--;
 679              info_block->free += dm->size;
 680
 681              dm->size |= DM_BLOCK_FREE;
 682              return TRUE;
 683        }
 684    }
 685    return FALSE;
 686 }
 687
 688 /***********************************************************************
 689  *           DOSMEM_ResizeBlock
 690  */
 691 LPVOID DOSMEM_ResizeBlock(void* ptr, UINT size, UINT16* pseg)
 692 {
 693    char         *block = NULL;
 694    dosmem_info  *info_block = DOSMEM_InfoBlock();
 695
 696    if( ptr >= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry)) &&
 697        ptr < (void*)DOSMEM_MemoryTop() && !((((char*)ptr)
 698                   - DOSMEM_dosmem) & 0xf) )
 699    {
 700        dosmem_entry  *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
 701
 702        if( pseg ) *pseg = ((char*)ptr - DOSMEM_dosmem) >> 4;
 703
 704        if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL))
 705          )
 706        {
 707              dosmem_entry  *next = NEXT_BLOCK(dm);
 708              UINT blocksize, orgsize = dm->size & DM_BLOCK_MASK;
 709
 710              while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
 711              {
 712                  dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
 713                  next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
 714                  next = NEXT_BLOCK(dm);
 715              }
 716
 717              blocksize = dm->size & DM_BLOCK_MASK;
 718              if (blocksize >= size)
 719              {
 720                  block = ((char*)dm) + sizeof(dosmem_entry);
 721                  if( blocksize - size > 0x20 )
 722                  {
 723                      /* split dm so that the next one stays
 724                       * paragraph-aligned (and next gains free bit) */
 725
 726                      dm->size = (((size + 0xf + sizeof(dosmem_entry)) & ~0xf) -
 727                                                 sizeof(dosmem_entry));
 728                      next = (dosmem_entry*)(((char*)dm) +
 729                              sizeof(dosmem_entry) + dm->size);
 730                      next->size = (blocksize - (dm->size +
 731                              sizeof(dosmem_entry))) | DM_BLOCK_FREE
 732                                                     ;
 733                  } else dm->size &= DM_BLOCK_MASK;
 734
 735                  info_block->free += orgsize - dm->size;
 736              } else {
 737                  /* the collapse didn't help, try getting a new block */
 738                  block = DOSMEM_GetBlock(size, pseg);
 739                  if (block) {
 740                      /* we got one, copy the old data there (we do need to, right?) */
 741                      memcpy(block, ((char*)dm) + sizeof(dosmem_entry),
 742                                    (size<orgsize) ? size : orgsize);
 743                      /* free old block */
 744                      info_block->blocks--;
 745                      info_block->free += dm->size;
 746
 747                      dm->size |= DM_BLOCK_FREE;
 748                  } else {
 749                      /* and Bill Gates said 640K should be enough for everyone... */
 750
 751                      /* need to split original and collapsed blocks apart again,
 752                       * and free the collapsed blocks again, before exiting */
 753                      if( blocksize - orgsize > 0x20 )
 754                      {
 755                          /* split dm so that the next one stays
 756                           * paragraph-aligned (and next gains free bit) */
 757
 758                          dm->size = (((orgsize + 0xf + sizeof(dosmem_entry)) & ~0xf) -
 759                                                        sizeof(dosmem_entry));
 760                          next = (dosmem_entry*)(((char*)dm) +
 761                                  sizeof(dosmem_entry) + dm->size);
 762                          next->size = (blocksize - (dm->size +
 763                                  sizeof(dosmem_entry))) | DM_BLOCK_FREE
 764                                                         ;
 765                      } else dm->size &= DM_BLOCK_MASK;
 766                  }
 767              }
 768        }
 769    }
 770    return (LPVOID)block;
 771 }
 772
 773
 774 /***********************************************************************
 775  *           DOSMEM_Available
 776  */
 777 UINT DOSMEM_Available(void)
 778 {
 779    UINT          blocksize, available = 0;
 780    dosmem_entry *dm;
 781
 782    dm = DOSMEM_RootBlock();
 783
 784    while (dm && dm->size != DM_BLOCK_TERMINAL)
 785    {
 786 #ifdef __DOSMEM_DEBUG__
 787        if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
 788        {
 789             WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)prev);
 790             return NULL;
 791        }
 792        prev = dm;
 793 #endif
 794        if( dm->size & DM_BLOCK_FREE )
 795        {
 796            dosmem_entry  *next = NEXT_BLOCK(dm);
 797
 798            while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
 799            {
 800                dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
 801                next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
 802                next = NEXT_BLOCK(dm);
 803            }
 804
 805            blocksize = dm->size & DM_BLOCK_MASK;
 806            if ( blocksize > available ) available = blocksize;
 807            dm = next;
 808        }
 809        else dm = NEXT_BLOCK(dm);
 810    }
 811    return available;
 812 }
 813
 814
 815 /***********************************************************************
 816  *           DOSMEM_MapLinearToDos
 817  *
 818  * Linear address to the DOS address space.
 819  */
 820 UINT DOSMEM_MapLinearToDos(LPVOID ptr)
 821 {
 822     if (((char*)ptr >= DOSMEM_dosmem) &&
 823         ((char*)ptr < DOSMEM_dosmem + 0x100000))
 824           return (UINT)ptr - (UINT)DOSMEM_dosmem;
 825     return (UINT)ptr;
 826 }
 827
 828
 829 /***********************************************************************
 830  *           DOSMEM_MapDosToLinear
 831  *
 832  * DOS linear address to the linear address space.
 833  */
 834 LPVOID DOSMEM_MapDosToLinear(UINT ptr)
 835 {
 836     if (ptr < 0x100000) return (LPVOID)(ptr + (UINT)DOSMEM_dosmem);
 837     return (LPVOID)ptr;
 838 }
 839
 840
 841 /***********************************************************************
 842  *           DOSMEM_MapRealToLinear
 843  *
 844  * Real mode DOS address into a linear pointer
 845  */
 846 LPVOID DOSMEM_MapRealToLinear(DWORD x)
 847 {
 848    LPVOID       lin;
 849
 850    lin=DOSMEM_dosmem+(x&0xffff)+(((x&0xffff0000)>>16)*16);
 851    TRACE_(selector)("(0x%08lx) returns %p.\n", x, lin );
 852    return lin;
 853 }
 854
 855 /***********************************************************************
 856  *           DOSMEM_AllocSelector
 857  *
 858  * Allocates a protected mode selector for a realmode segment.
 859  */
 860 WORD DOSMEM_AllocSelector(WORD realsel)
 861 {
 862         HMODULE16 hModule = GetModuleHandle16("KERNEL");
 863         WORD    sel;
 864
 865         sel=GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_dosmem+realsel*16, 0x10000,
 866                                 hModule, WINE_LDT_FLAGS_DATA );
 867         TRACE_(selector)("(0x%04x) returns 0x%04x.\n", realsel,sel);
 868         return sel;
 869 }