dlls/winedos/devices.c

   1 /*
   2  * DOS devices
   3  *
   4  * Copyright 1999 Ove Kåven
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include "wine/winbase16.h"
  24 #include "dosexe.h"
  25 #include "wine/debug.h"
  26
  27 #include "pshpack1.h"
  28
  29 /* Warning: need to return LOL ptr w/ offset 0 (&ptr_first_DPB) to programs ! */
  30 typedef struct _DOS_LISTOFLISTS
  31 {
  32     WORD  CX_Int21_5e01;        /* -24d contents of CX from INT 21/AX=5E01h */
  33     WORD  LRU_count_FCB_cache;  /* -22d */
  34     WORD  LRU_count_FCB_open;   /* -20d */
  35     DWORD OEM_func_handler;     /* -18d OEM function of INT 21/AH=F8h */
  36     WORD  INT21_offset;         /* -14d offset in DOS CS of code to return from INT 21 call */
  37     WORD  sharing_retry_count;  /* -12d */
  38     WORD  sharing_retry_delay;  /* -10d */
  39     DWORD ptr_disk_buf;         /* -8d ptr to current disk buf */
  40     WORD  offs_unread_CON;      /* -4d pointer in DOS data segment of unread CON input */
  41     WORD  seg_first_MCB;        /* -2d */
  42     DWORD ptr_first_DPB;        /* 00 */
  43     DWORD ptr_first_SysFileTable; /* 04 */
  44     DWORD ptr_clock_dev_hdr;    /* 08 */
  45     DWORD ptr_CON_dev_hdr;      /* 0C */
  46     WORD  max_byte_per_sec;     /* 10 maximum bytes per sector of any block device */
  47     DWORD ptr_disk_buf_info;    /* 12 */
  48     DWORD ptr_array_CDS;        /* 16 current directory structure */
  49     DWORD ptr_sys_FCB;          /* 1A */
  50     WORD  nr_protect_FCB;       /* 1E */
  51     BYTE  nr_block_dev;         /* 20 */
  52     BYTE  nr_avail_drive_letters; /* 21 */
  53     DOS_DEVICE_HEADER NUL_dev;  /* 22 */
  54     BYTE  nr_drives_JOINed;     /* 34 */
  55     WORD  ptr_spec_prg_names;   /* 35 */
  56     DWORD ptr_SETVER_prg_list;  /* 37 */
  57     WORD DOS_HIGH_A20_func_offs;/* 3B */
  58     WORD PSP_last_exec;         /* 3D if DOS in HMA: PSP of program executed last; if DOS low: 0000h */
  59     WORD BUFFERS_val;           /* 3F */
  60     WORD BUFFERS_nr_lookahead;  /* 41 */
  61     BYTE boot_drive;            /* 43 */
  62     BYTE flag_DWORD_moves;      /* 44 01h for 386+, 00h otherwise */
  63     WORD size_extended_mem;     /* 45 size of extended mem in KB */
  64     SEGPTR wine_rm_lol;         /* -- wine: Real mode pointer to LOL */
  65     SEGPTR wine_pm_lol;         /* -- wine: Protected mode pointer to LOL */
  66 } DOS_LISTOFLISTS;
  67
  68 #include "poppack.h"
  69
  70 #define CON_BUFFER 128
  71
  72 enum strategy { SYSTEM_STRATEGY_NUL, SYSTEM_STRATEGY_CON, NB_SYSTEM_STRATEGIES };
  73
  74 static void *strategy_data[NB_SYSTEM_STRATEGIES];
  75
  76 #define LJMP 0xea
  77
  78
  79 /* prototypes */
  80 static void WINAPI nul_strategy(CONTEXT86*ctx);
  81 static void WINAPI nul_interrupt(CONTEXT86*ctx);
  82 static void WINAPI con_strategy(CONTEXT86*ctx);
  83 static void WINAPI con_interrupt(CONTEXT86*ctx);
  84
  85 /* devices */
  86 static const WINEDEV devs[] =
  87 {
  88   { "NUL     ",
  89     ATTR_CHAR|ATTR_NUL|ATTR_DEVICE,
  90     nul_strategy, nul_interrupt },
  91
  92   { "CON     ",
  93     ATTR_CHAR|ATTR_STDIN|ATTR_STDOUT|ATTR_FASTCON|ATTR_NOTEOF|ATTR_DEVICE,
  94     con_strategy, con_interrupt }
  95 };
  96
  97 #define NR_DEVS (sizeof(devs)/sizeof(WINEDEV))
  98
  99 /* DOS data segment */
 100 typedef struct
 101 {
 102     DOS_LISTOFLISTS    lol;
 103     DOS_DEVICE_HEADER  dev[NR_DEVS-1];
 104     DOS_DEVICE_HEADER *last_dev; /* ptr to last registered device driver */
 105     WINEDEV_THUNK      thunk[NR_DEVS];
 106     REQ_IO             req;
 107     BYTE               buffer[CON_BUFFER];
 108
 109 } DOS_DATASEG;
 110
 111 #define DOS_DATASEG_OFF(xxx) FIELD_OFFSET(DOS_DATASEG, xxx)
 112
 113 static DWORD DOS_LOLSeg;
 114
 115 static struct _DOS_LISTOFLISTS * DOSMEM_LOL(void)
 116 {
 117     return PTR_REAL_TO_LIN(HIWORD(DOS_LOLSeg),0);
 118 }
 119
 120
 121 /* the device implementations */
 122 static void do_lret(CONTEXT86*ctx)
 123 {
 124   WORD *stack = CTX_SEG_OFF_TO_LIN(ctx, ctx->SegSs, ctx->Esp);
 125
 126   ctx->Eip   = *(stack++);
 127   ctx->SegCs = *(stack++);
 128   ctx->Esp  += 2*sizeof(WORD);
 129 }
 130
 131 static void do_strategy(CONTEXT86*ctx, int id, int extra)
 132 {
 133   REQUEST_HEADER *hdr = CTX_SEG_OFF_TO_LIN(ctx, ctx->SegEs, ctx->Ebx);
 134   void **hdr_ptr = strategy_data[id];
 135
 136   if (!hdr_ptr) {
 137     hdr_ptr = calloc(1,sizeof(void *)+extra);
 138     strategy_data[id] = hdr_ptr;
 139   }
 140   *hdr_ptr = hdr;
 141   do_lret(ctx);
 142 }
 143
 144 static REQUEST_HEADER * get_hdr(int id, void**extra)
 145 {
 146   void **hdr_ptr = strategy_data[id];
 147   if (extra)
 148     *extra = hdr_ptr ? (void*)(hdr_ptr+1) : NULL;
 149   return hdr_ptr ? *hdr_ptr : NULL;
 150 }
 151
 152 static void WINAPI nul_strategy(CONTEXT86*ctx)
 153 {
 154   do_strategy(ctx, SYSTEM_STRATEGY_NUL, 0);
 155 }
 156
 157 static void WINAPI nul_interrupt(CONTEXT86*ctx)
 158 {
 159   REQUEST_HEADER *hdr = get_hdr(SYSTEM_STRATEGY_NUL, NULL);
 160   /* eat everything and recycle nothing */
 161   switch (hdr->command) {
 162   case CMD_INPUT:
 163     ((REQ_IO*)hdr)->count = 0;
 164     hdr->status = STAT_DONE;
 165     break;
 166   case CMD_SAFEINPUT:
 167     hdr->status = STAT_DONE|STAT_BUSY;
 168     break;
 169   default:
 170     hdr->status = STAT_DONE;
 171   }
 172   do_lret(ctx);
 173 }
 174
 175 static void WINAPI con_strategy(CONTEXT86*ctx)
 176 {
 177   do_strategy(ctx, SYSTEM_STRATEGY_CON, sizeof(int));
 178 }
 179
 180 static void WINAPI con_interrupt(CONTEXT86*ctx)
 181 {
 182   int *scan;
 183   REQUEST_HEADER *hdr = get_hdr(SYSTEM_STRATEGY_CON,(void **)&scan);
 184   BIOSDATA *bios = DOSVM_BiosData();
 185   WORD CurOfs = bios->NextKbdCharPtr;
 186   DOS_LISTOFLISTS *lol = DOSMEM_LOL();
 187   DOS_DATASEG *dataseg = (DOS_DATASEG *)lol;
 188   BYTE *linebuffer = dataseg->buffer;
 189   BYTE *curbuffer = (lol->offs_unread_CON) ?
 190     (((BYTE*)dataseg) + lol->offs_unread_CON) : (BYTE*)NULL;
 191   DOS_DEVICE_HEADER *con = dataseg->dev;
 192   DWORD w;
 193
 194   switch (hdr->command) {
 195   case CMD_INPUT:
 196     {
 197       REQ_IO *io = (REQ_IO *)hdr;
 198       WORD count = io->count, len = 0;
 199       BYTE *buffer = CTX_SEG_OFF_TO_LIN(ctx,
 200                                         SELECTOROF(io->buffer),
 201                                         (DWORD)OFFSETOF(io->buffer));
 202
 203       hdr->status = STAT_BUSY;
 204       /* first, check whether we already have data in line buffer */
 205       if (curbuffer) {
 206         /* yep, copy as much as we can */
 207         BYTE data = 0;
 208         while ((len<count) && (data != '\r')) {
 209           data = *curbuffer++;
 210           buffer[len++] = data;
 211         }
 212         if (data == '\r') {
 213           /* line buffer emptied */
 214           lol->offs_unread_CON = 0;
 215           curbuffer = NULL;
 216           /* if we're not in raw mode, call it a day */
 217           if (!(con->attr & ATTR_RAW)) {
 218             hdr->status = STAT_DONE;
 219             io->count = len;
 220             break;
 221           }
 222         } else {
 223           /* still some data left */
 224           lol->offs_unread_CON = curbuffer - (BYTE*)lol;
 225           /* but buffer was filled, we're done */
 226           hdr->status = STAT_DONE;
 227           io->count = len;
 228           break;
 229         }
 230       }
 231
 232       /* if we're in raw mode, we just need to fill the buffer */
 233       if (con->attr & ATTR_RAW) {
 234         while (len<count) {
 235           WORD data;
 236
 237           /* do we have a waiting scancode? */
 238           if (*scan) {
 239             /* yes, store scancode in buffer */
 240             buffer[len++] = *scan;
 241             *scan = 0;
 242             if (len==count) break;
 243           }
 244
 245           /* check for new keyboard input */
 246           while (CurOfs == bios->FirstKbdCharPtr) {
 247             /* no input available yet, so wait... */
 248             DOSVM_Wait( ctx );
 249           }
 250           /* read from keyboard queue (call int16?) */
 251           data = ((WORD*)bios)[CurOfs];
 252           CurOfs += 2;
 253           if (CurOfs >= bios->KbdBufferEnd) CurOfs = bios->KbdBufferStart;
 254           bios->NextKbdCharPtr = CurOfs;
 255           /* if it's an extended key, save scancode */
 256           if (LOBYTE(data) == 0) *scan = HIBYTE(data);
 257           /* store ASCII char in buffer */
 258           buffer[len++] = LOBYTE(data);
 259         }
 260       } else {
 261         /* we're not in raw mode, so we need to do line input... */
 262         while (TRUE) {
 263           WORD data;
 264           /* check for new keyboard input */
 265           while (CurOfs == bios->FirstKbdCharPtr) {
 266             /* no input available yet, so wait... */
 267             DOSVM_Wait( ctx );
 268           }
 269           /* read from keyboard queue (call int16?) */
 270           data = ((WORD*)bios)[CurOfs];
 271           CurOfs += 2;
 272           if (CurOfs >= bios->KbdBufferEnd) CurOfs = bios->KbdBufferStart;
 273           bios->NextKbdCharPtr = CurOfs;
 274
 275           if (LOBYTE(data) == '\r') {
 276             /* it's the return key, we're done */
 277             linebuffer[len++] = LOBYTE(data);
 278             break;
 279           }
 280           else if (LOBYTE(data) >= ' ') {
 281             /* a character */
 282             if ((len+1)<CON_BUFFER) {
 283               linebuffer[len] = LOBYTE(data);
 284               WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), &linebuffer[len++], 1, &w, NULL);
 285             }
 286             /* else beep, but I don't like noise */
 287           }
 288           else switch (LOBYTE(data)) {
 289           case '\b':
 290             if (len>0) {
 291               len--;
 292               WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), "\b \b", 3, &w, NULL);
 293             }
 294             break;
 295           }
 296         }
 297         if (len > count) {
 298           /* save rest of line for later */
 299           lol->offs_unread_CON = linebuffer - (BYTE*)lol + count;
 300           len = count;
 301         }
 302         memcpy(buffer, linebuffer, len);
 303       }
 304       hdr->status = STAT_DONE;
 305       io->count = len;
 306     }
 307     break;
 308   case CMD_SAFEINPUT:
 309     if (curbuffer) {
 310       /* some line input waiting */
 311       hdr->status = STAT_DONE;
 312       ((REQ_SAFEINPUT*)hdr)->data = *curbuffer;
 313     }
 314     else if (con->attr & ATTR_RAW) {
 315       if (CurOfs == bios->FirstKbdCharPtr) {
 316         /* no input */
 317         hdr->status = STAT_DONE|STAT_BUSY;
 318       } else {
 319         /* some keyboard input waiting */
 320         hdr->status = STAT_DONE;
 321         ((REQ_SAFEINPUT*)hdr)->data = ((BYTE*)bios)[CurOfs];
 322       }
 323     } else {
 324       /* no line input */
 325       hdr->status = STAT_DONE|STAT_BUSY;
 326     }
 327     break;
 328   case CMD_INSTATUS:
 329     if (curbuffer) {
 330       /* we have data */
 331       hdr->status = STAT_DONE;
 332     }
 333     else if (con->attr & ATTR_RAW) {
 334       if (CurOfs == bios->FirstKbdCharPtr) {
 335         /* no input */
 336         hdr->status = STAT_DONE|STAT_BUSY;
 337       } else {
 338         /* some keyboard input waiting */
 339         hdr->status = STAT_DONE;
 340       }
 341     } else {
 342       /* no line input */
 343       hdr->status = STAT_DONE|STAT_BUSY;
 344     }
 345
 346     break;
 347   case CMD_INFLUSH:
 348     /* flush line and keyboard queue */
 349     lol->offs_unread_CON = 0;
 350     bios->NextKbdCharPtr = bios->FirstKbdCharPtr;
 351     break;
 352   case CMD_OUTPUT:
 353   case CMD_SAFEOUTPUT:
 354     {
 355       REQ_IO *io = (REQ_IO *)hdr;
 356       BYTE *buffer = CTX_SEG_OFF_TO_LIN(ctx,
 357                                         SELECTOROF(io->buffer),
 358                                         (DWORD)OFFSETOF(io->buffer));
 359       DWORD result = 0;
 360       WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), buffer, io->count, &result, NULL);
 361       io->count = result;
 362       hdr->status = STAT_DONE;
 363     }
 364     break;
 365   default:
 366     hdr->status = STAT_DONE;
 367   }
 368   do_lret(ctx);
 369 }
 370
 371 static void InitListOfLists(DOS_LISTOFLISTS *DOS_LOL)
 372 {
 373 /*
 374 Output of DOS 6.22:
 375
 376 0133:0020                    6A 13-33 01 CC 00 33 01 59 00         j.3...3.Y.
 377 0133:0030  70 00 00 00 72 02 00 02-6D 00 33 01 00 00 2E 05   p...r...m.3.....
 378 0133:0040  00 00 FC 04 00 00 03 08-92 21 11 E0 04 80 C6 0D   .........!......
 379 0133:0050  CC 0D 4E 55 4C 20 20 20-20 20 00 00 00 00 00 00   ..NUL     ......
 380 0133:0060  00 4B BA C1 06 14 00 00-00 03 01 00 04 70 CE FF   .K...........p..
 381 0133:0070  FF 00 00 00 00 00 00 00-00 01 00 00 0D 05 00 00   ................
 382 0133:0080  00 FF FF 00 00 00 00 FE-00 00 F8 03 FF 9F 70 02   ..............p.
 383 0133:0090  D0 44 C8 FD D4 44 C8 FD-D4 44 C8 FD D0 44 C8 FD   .D...D...D...D..
 384 0133:00A0  D0 44 C8 FD D0 44                                 .D...D
 385 */
 386   DOS_LOL->CX_Int21_5e01                = 0x0;
 387   DOS_LOL->LRU_count_FCB_cache  = 0x0;
 388   DOS_LOL->LRU_count_FCB_open           = 0x0;
 389   DOS_LOL->OEM_func_handler             = -1; /* not available */
 390   DOS_LOL->INT21_offset         = 0x0;
 391   DOS_LOL->sharing_retry_count  = 3;
 392   DOS_LOL->sharing_retry_delay  = 1;
 393   DOS_LOL->ptr_disk_buf         = 0x0;
 394   DOS_LOL->offs_unread_CON              = 0x0;
 395   DOS_LOL->seg_first_MCB                = 0x0;
 396   DOS_LOL->ptr_first_DPB                = 0x0;
 397   DOS_LOL->ptr_first_SysFileTable       = 0x0;
 398   DOS_LOL->ptr_clock_dev_hdr            = 0x0;
 399   DOS_LOL->ptr_CON_dev_hdr              = 0x0;
 400   DOS_LOL->max_byte_per_sec             = 512;
 401   DOS_LOL->ptr_disk_buf_info            = 0x0;
 402   DOS_LOL->ptr_array_CDS                = 0x0;
 403   DOS_LOL->ptr_sys_FCB          = 0x0;
 404   DOS_LOL->nr_protect_FCB               = 0x0;
 405   DOS_LOL->nr_block_dev         = 0x0;
 406   DOS_LOL->nr_avail_drive_letters       = 26; /* A - Z */
 407   DOS_LOL->nr_drives_JOINed             = 0x0;
 408   DOS_LOL->ptr_spec_prg_names           = 0x0;
 409   DOS_LOL->ptr_SETVER_prg_list  = 0x0; /* no SETVER list */
 410   DOS_LOL->DOS_HIGH_A20_func_offs       = 0x0;
 411   DOS_LOL->PSP_last_exec                = 0x0;
 412   DOS_LOL->BUFFERS_val          = 99; /* maximum: 99 */
 413   DOS_LOL->BUFFERS_nr_lookahead = 8; /* maximum: 8 */
 414   DOS_LOL->boot_drive                   = 3; /* C: */
 415   DOS_LOL->flag_DWORD_moves             = 0x01; /* i386+ */
 416   DOS_LOL->size_extended_mem            = 0xf000; /* very high value */
 417 }
 418
 419 void DOSDEV_SetupDevice(const WINEDEV * devinfo,
 420                         WORD seg, WORD off_dev, WORD off_thunk)
 421 {
 422   DOS_DEVICE_HEADER *dev = PTR_REAL_TO_LIN(seg, off_dev);
 423   WINEDEV_THUNK *thunk = PTR_REAL_TO_LIN(seg, off_thunk);
 424   DOS_DATASEG *dataseg = (DOS_DATASEG*)DOSMEM_LOL();
 425
 426   dev->attr = devinfo->attr;
 427   dev->strategy  = off_thunk + FIELD_OFFSET(WINEDEV_THUNK, ljmp1);
 428   dev->interrupt = off_thunk + FIELD_OFFSET(WINEDEV_THUNK, ljmp2);
 429   memcpy(dev->name, devinfo->name, 8);
 430
 431   thunk->ljmp1     = LJMP;
 432   thunk->strategy  = DPMI_AllocInternalRMCB(devinfo->strategy);
 433   thunk->ljmp2     = LJMP;
 434   thunk->interrupt = DPMI_AllocInternalRMCB(devinfo->interrupt);
 435
 436   dev->next_dev = NONEXT;
 437   if (dataseg->last_dev)
 438       dataseg->last_dev->next_dev = MAKESEGPTR(seg, off_dev);
 439   dataseg->last_dev = dev;
 440 }
 441
 442 void DOSDEV_InstallDOSDevices(void)
 443 {
 444   DOS_DATASEG *dataseg;
 445   WORD seg;
 446   WORD selector;
 447   unsigned int n;
 448
 449   /* allocate DOS data segment or something */
 450   dataseg = DOSVM_AllocDataUMB( sizeof(DOS_DATASEG), &seg, &selector );
 451
 452   DOS_LOLSeg = MAKESEGPTR( seg, 0 );
 453   DOSMEM_LOL()->wine_rm_lol =
 454       MAKESEGPTR( seg, FIELD_OFFSET(DOS_LISTOFLISTS, ptr_first_DPB) );
 455   DOSMEM_LOL()->wine_pm_lol =
 456       MAKESEGPTR( selector, FIELD_OFFSET(DOS_LISTOFLISTS, ptr_first_DPB) );
 457
 458   /* initialize the magnificent List Of Lists */
 459   InitListOfLists(&dataseg->lol);
 460
 461   /* Set up first device (NUL) */
 462   dataseg->last_dev = NULL;
 463   DOSDEV_SetupDevice( &devs[0],
 464                       seg,
 465                       DOS_DATASEG_OFF(lol.NUL_dev),
 466                       DOS_DATASEG_OFF(thunk[0]) );
 467
 468   /* Set up the remaining devices */
 469   for (n = 1; n < NR_DEVS; n++)
 470     DOSDEV_SetupDevice( &devs[n],
 471                         seg,
 472                         DOS_DATASEG_OFF(dev[n-1]),
 473                         DOS_DATASEG_OFF(thunk[n]) );
 474
 475   /* CON is device 1 */
 476   dataseg->lol.ptr_CON_dev_hdr = MAKESEGPTR(seg, DOS_DATASEG_OFF(dev[0]));
 477 }
 478
 479 DWORD DOSDEV_Console(void)
 480 {
 481   return DOSMEM_LOL()->ptr_CON_dev_hdr;
 482 }
 483
 484 DWORD DOSDEV_FindCharDevice(char*name)
 485 {
 486   SEGPTR cur_ptr = MAKESEGPTR(HIWORD(DOS_LOLSeg), FIELD_OFFSET(DOS_LISTOFLISTS,NUL_dev));
 487   DOS_DEVICE_HEADER *cur = PTR_REAL_TO_LIN(SELECTOROF(cur_ptr),OFFSETOF(cur_ptr));
 488   char dname[8];
 489   int cnt;
 490
 491   /* get first 8 characters */
 492   /* if less than 8 characters, pad with spaces */
 493   for (cnt=0; name[cnt] && cnt<8; cnt++)
 494     dname[cnt]=name[cnt];
 495
 496   while(cnt<8) dname[cnt++] = ' ';
 497
 498   /* search for char devices with the right name */
 499   while (cur &&
 500          ((!(cur->attr & ATTR_CHAR)) ||
 501           memcmp(cur->name,dname,8))) {
 502     cur_ptr = cur->next_dev;
 503     if (cur_ptr == NONEXT) cur=NULL;
 504     else cur = PTR_REAL_TO_LIN(SELECTOROF(cur_ptr),OFFSETOF(cur_ptr));
 505   }
 506   return cur_ptr;
 507 }
 508
 509 static void DOSDEV_DoReq(void*req, DWORD dev)
 510 {
 511   REQUEST_HEADER *hdr = (REQUEST_HEADER *)req;
 512   DOS_DEVICE_HEADER *dhdr;
 513   CONTEXT86 ctx;
 514   char *phdr;
 515
 516   dhdr = PTR_REAL_TO_LIN(SELECTOROF(dev),OFFSETOF(dev));
 517   phdr = ((char*)DOSMEM_LOL()) + DOS_DATASEG_OFF(req);
 518
 519   /* copy request to request scratch area */
 520   memcpy(phdr, req, hdr->size);
 521
 522   /* prepare to call device driver */
 523   memset(&ctx, 0, sizeof(ctx));
 524   ctx.EFlags |= V86_FLAG;
 525
 526   /* ES:BX points to request for strategy routine */
 527   ctx.SegEs = HIWORD(DOS_LOLSeg);
 528   ctx.Ebx   = DOS_DATASEG_OFF(req);
 529
 530   /* call strategy routine */
 531   ctx.SegCs = SELECTOROF(dev);
 532   ctx.Eip   = dhdr->strategy;
 533   DPMI_CallRMProc(&ctx, 0, 0, 0);
 534
 535   /* call interrupt routine */
 536   ctx.SegCs = SELECTOROF(dev);
 537   ctx.Eip   = dhdr->interrupt;
 538   DPMI_CallRMProc(&ctx, 0, 0, 0);
 539
 540   /* completed, copy request back */
 541   memcpy(req, phdr, hdr->size);
 542
 543   if (hdr->status & STAT_ERROR) {
 544     switch (hdr->status & STAT_MASK) {
 545     case 0x0F: /* invalid disk change */
 546       /* this error seems to fit the bill */
 547       SetLastError(ERROR_NOT_SAME_DEVICE);
 548       break;
 549     default:
 550       SetLastError((hdr->status & STAT_MASK) + 0x13);
 551       break;
 552     }
 553   }
 554 }
 555
 556 static int DOSDEV_IO(unsigned cmd, DWORD dev, DWORD buf, int buflen)
 557 {
 558   REQ_IO req;
 559
 560   req.hdr.size=sizeof(req);
 561   req.hdr.unit=0; /* not dealing with block devices yet */
 562   req.hdr.command=cmd;
 563   req.hdr.status=STAT_BUSY;
 564   req.media=0; /* not dealing with block devices yet */
 565   req.buffer=buf;
 566   req.count=buflen;
 567   req.sector=0; /* block devices */
 568   req.volume=0; /* block devices */
 569
 570   DOSDEV_DoReq(&req, dev);
 571
 572   return req.count;
 573 }
 574
 575 int DOSDEV_Peek(DWORD dev, BYTE*data)
 576 {
 577   REQ_SAFEINPUT req;
 578
 579   req.hdr.size=sizeof(req);
 580   req.hdr.unit=0; /* not dealing with block devices yet */
 581   req.hdr.command=CMD_SAFEINPUT;
 582   req.hdr.status=STAT_BUSY;
 583   req.data=0;
 584
 585   DOSDEV_DoReq(&req, dev);
 586
 587   if (req.hdr.status & STAT_BUSY) return 0;
 588
 589   *data = req.data;
 590   return 1;
 591 }
 592
 593 int DOSDEV_Read(DWORD dev, DWORD buf, int buflen)
 594 {
 595   return DOSDEV_IO(CMD_INPUT, dev, buf, buflen);
 596 }
 597
 598 int DOSDEV_Write(DWORD dev, DWORD buf, int buflen, int verify)
 599 {
 600   return DOSDEV_IO(verify?CMD_SAFEOUTPUT:CMD_OUTPUT, dev, buf, buflen);
 601 }
 602
 603 int DOSDEV_IoctlRead(DWORD dev, DWORD buf, int buflen)
 604 {
 605   return DOSDEV_IO(CMD_INIOCTL, dev, buf, buflen);
 606 }
 607
 608 int DOSDEV_IoctlWrite(DWORD dev, DWORD buf, int buflen)
 609 {
 610   return DOSDEV_IO(CMD_OUTIOCTL, dev, buf, buflen);
 611 }
 612
 613 void DOSDEV_SetSharingRetry(WORD delay, WORD count)
 614 {
 615     DOSMEM_LOL()->sharing_retry_delay = delay;
 616     if (count) DOSMEM_LOL()->sharing_retry_count = count;
 617 }
 618
 619 SEGPTR DOSDEV_GetLOL(BOOL v86)
 620 {
 621     if (v86) return DOSMEM_LOL()->wine_rm_lol;
 622     else return DOSMEM_LOL()->wine_pm_lol;
 623 }