reactos/boot/freeldr/freeldr/arch/i386/i386disk.c

   1 /*
   2  *  FreeLoader
   3  *  Copyright (C) 1998-2003  Brian Palmer  <brianp@sginet.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include "freeldr.h"
  21 #include "debug.h"
  22 #include "i386.h"
  23 #include "fsrec.h"
  24
  25 /////////////////////////////////////////////////////////////////////////////////////////////
  26 // FUNCTIONS
  27 /////////////////////////////////////////////////////////////////////////////////////////////
  28
  29 #ifdef __i386__
  30
  31 BOOL DiskResetController(ULONG DriveNumber)
  32 {
  33         REGS    RegsIn;
  34         REGS    RegsOut;
  35
  36         DbgPrint((DPRINT_DISK, "DiskResetController(0x%x) DISK OPERATION FAILED -- RESETTING CONTROLLER\n", DriveNumber));
  37
  38         // BIOS Int 13h, function 0 - Reset disk system
  39         // AH = 00h
  40         // DL = drive (if bit 7 is set both hard disks and floppy disks reset)
  41         // Return:
  42         // AH = status
  43         // CF clear if successful
  44         // CF set on error
  45         RegsIn.b.ah = 0x00;
  46         RegsIn.b.dl = DriveNumber;
  47
  48         // Reset the disk controller
  49         Int386(0x13, &RegsIn, &RegsOut);
  50
  51         return INT386_SUCCESS(RegsOut);
  52 }
  53
  54 BOOL DiskInt13ExtensionsSupported(ULONG DriveNumber)
  55 {
  56         REGS    RegsIn;
  57         REGS    RegsOut;
  58
  59         DbgPrint((DPRINT_DISK, "DiskInt13ExtensionsSupported()\n"));
  60
  61         // IBM/MS INT 13 Extensions - INSTALLATION CHECK
  62         // AH = 41h
  63         // BX = 55AAh
  64         // DL = drive (80h-FFh)
  65         // Return:
  66         // CF set on error (extensions not supported)
  67         // AH = 01h (invalid function)
  68         // CF clear if successful
  69         // BX = AA55h if installed
  70         // AH = major version of extensions
  71         // 01h = 1.x
  72         // 20h = 2.0 / EDD-1.0
  73         // 21h = 2.1 / EDD-1.1
  74         // 30h = EDD-3.0
  75         // AL = internal use
  76         // CX = API subset support bitmap
  77         // DH = extension version (v2.0+ ??? -- not present in 1.x)
  78         //
  79         // Bitfields for IBM/MS INT 13 Extensions API support bitmap
  80         // Bit 0, extended disk access functions (AH=42h-44h,47h,48h) supported
  81         // Bit 1, removable drive controller functions (AH=45h,46h,48h,49h,INT 15/AH=52h) supported
  82         // Bit 2, enhanced disk drive (EDD) functions (AH=48h,AH=4Eh) supported
  83         //        extended drive parameter table is valid
  84         // Bits 3-15 reserved
  85         RegsIn.b.ah = 0x41;
  86         RegsIn.w.bx = 0x55AA;
  87         RegsIn.b.dl = DriveNumber;
  88
  89         // Reset the disk controller
  90         Int386(0x13, &RegsIn, &RegsOut);
  91
  92         if (!INT386_SUCCESS(RegsOut))
  93         {
  94                 // CF set on error (extensions not supported)
  95                 return FALSE;
  96         }
  97
  98         if (RegsOut.w.bx != 0xAA55)
  99         {
 100                 // BX = AA55h if installed
 101                 return FALSE;
 102         }
 103
 104         // Note:
 105         // The original check is too strict because some BIOSes report that
 106         // extended disk access functions are not suported when booting
 107         // from a CD (e.g. Phoenix BIOS v6.00PG). Argh!
 108 #if 0
 109         if (!(RegsOut.w.cx & 0x0001))
 110         {
 111                 // CX = API subset support bitmap
 112                 // Bit 0, extended disk access functions (AH=42h-44h,47h,48h) supported
 113                 return FALSE;
 114         }
 115 #endif
 116
 117         // Use this relaxed check instead
 118         if (RegsOut.w.cx == 0x0000)
 119         {
 120                 // CX = API subset support bitmap
 121                 return FALSE;
 122         }
 123
 124         return TRUE;
 125 }
 126
 127 VOID DiskStopFloppyMotor(VOID)
 128 {
 129         WRITE_PORT_UCHAR((PUCHAR)0x3F2, 0);
 130 }
 131
 132 BOOL DiskGetExtendedDriveParameters(ULONG DriveNumber, PVOID Buffer, USHORT BufferSize)
 133 {
 134         REGS    RegsIn;
 135         REGS    RegsOut;
 136         PUSHORT Ptr = (PUSHORT)(BIOSCALLBUFFER);
 137
 138         DbgPrint((DPRINT_DISK, "DiskGetExtendedDriveParameters()\n"));
 139
 140         // Initialize transfer buffer
 141         *Ptr = BufferSize;
 142
 143         // BIOS Int 13h, function 48h - Get drive parameters
 144         // AH = 48h
 145         // DL = drive (bit 7 set for hard disk)
 146         // DS:SI = result buffer
 147         // Return:
 148         // CF set on error
 149         // AH = status (07h)
 150         // CF clear if successful
 151         // AH = 00h
 152         // DS:SI -> result buffer
 153         RegsIn.b.ah = 0x48;
 154         RegsIn.b.dl = DriveNumber;
 155         RegsIn.x.ds = BIOSCALLBUFSEGMENT;       // DS:SI -> result buffer
 156         RegsIn.w.si = BIOSCALLBUFOFFSET;
 157
 158         // Get drive parameters
 159         Int386(0x13, &RegsIn, &RegsOut);
 160
 161         if (!INT386_SUCCESS(RegsOut))
 162         {
 163                 return FALSE;
 164         }
 165
 166         memcpy(Buffer, Ptr, BufferSize);
 167
 168         return TRUE;
 169 }
 170
 171 BOOL i386DiskGetBootVolume(PULONG DriveNumber, PULONGLONG StartSector, PULONGLONG SectorCount, int *FsType)
 172 {
 173         PARTITION_TABLE_ENTRY   PartitionTableEntry;
 174         UCHAR                   VolumeType;
 175
 176         DbgPrint((DPRINT_FILESYSTEM, "FsOpenVolume() DriveNumber: 0x%x PartitionNumber: 0x%x\n", i386BootDrive, i386BootPartition));
 177
 178         // Check and see if it is a floppy drive
 179         // If so then just assume FAT12 file system type
 180         if (DiskIsDriveRemovable(i386BootDrive))
 181         {
 182                 DbgPrint((DPRINT_FILESYSTEM, "Drive is a floppy diskette drive. Assuming FAT12 file system.\n"));
 183
 184                 *DriveNumber = i386BootDrive;
 185                 *StartSector = 0;
 186                 *SectorCount = 2 * 80 * 18; /* FIXME hardcoded for 1.44 Mb */
 187                 *FsType = FS_FAT;
 188                 return TRUE;
 189         }
 190
 191         // Check for ISO9660 file system type
 192         if (i386BootDrive >= 0x80 && FsRecIsIso9660(i386BootDrive))
 193         {
 194                 DbgPrint((DPRINT_FILESYSTEM, "Drive is a cdrom drive. Assuming ISO-9660 file system.\n"));
 195
 196                 *DriveNumber = i386BootDrive;
 197                 *StartSector = 0;
 198                 *SectorCount = 0;
 199                 *FsType = FS_ISO9660;
 200                 return TRUE;
 201         }
 202
 203         // Get the requested partition entry
 204         if (i386BootPartition == 0)
 205         {
 206                 // Partition requested was zero which means the boot partition
 207                 if (! DiskGetActivePartitionEntry(i386BootDrive, &PartitionTableEntry))
 208                 {
 209                         return FALSE;
 210                 }
 211         }
 212         else
 213         {
 214                 // Get requested partition
 215                 if (! MachDiskGetPartitionEntry(i386BootDrive, i386BootPartition, &PartitionTableEntry))
 216                 {
 217                         return FALSE;
 218                 }
 219         }
 220
 221         // Check for valid partition
 222         if (PartitionTableEntry.SystemIndicator == PARTITION_ENTRY_UNUSED)
 223         {
 224                 return FALSE;
 225         }
 226
 227         // Try to recognize the file system
 228         if (!FsRecognizeVolume(i386BootDrive, PartitionTableEntry.SectorCountBeforePartition, &VolumeType))
 229         {
 230                 return FALSE;
 231         }
 232
 233         *DriveNumber = i386BootDrive;
 234         *StartSector = PartitionTableEntry.SectorCountBeforePartition;
 235         *SectorCount = PartitionTableEntry.PartitionSectorCount;
 236
 237         //switch (PartitionTableEntry.SystemIndicator)
 238         switch (VolumeType)
 239         {
 240         case PARTITION_FAT_12:
 241         case PARTITION_FAT_16:
 242         case PARTITION_HUGE:
 243         case PARTITION_XINT13:
 244         case PARTITION_FAT32:
 245         case PARTITION_FAT32_XINT13:
 246                 *FsType = FS_FAT;
 247                 return TRUE;
 248         case PARTITION_EXT2:
 249                 *FsType = FS_EXT2;
 250                 return TRUE;
 251         case PARTITION_NTFS:
 252                 *FsType = FS_NTFS;
 253                 return TRUE;
 254         default:
 255                 *FsType = 0;
 256                 return FALSE;
 257         }
 258
 259         return TRUE;
 260 }
 261
 262 VOID
 263 i386DiskGetBootDevice(PULONG BootDevice)
 264 {
 265   ((char *)BootDevice)[0] = (char)i386BootDrive;
 266   ((char *)BootDevice)[1] = (char)i386BootPartition;
 267 }
 268
 269 BOOL
 270 i386DiskBootingFromFloppy(VOID)
 271 {
 272   return i386BootDrive < 0x80;
 273 }
 274
 275 #define IsRecognizedPartition(P)  \
 276     ((P) == PARTITION_FAT_12       || \
 277      (P) == PARTITION_FAT_16       || \
 278      (P) == PARTITION_HUGE         || \
 279      (P) == PARTITION_IFS          || \
 280      (P) == PARTITION_EXT2         || \
 281      (P) == PARTITION_FAT32        || \
 282      (P) == PARTITION_FAT32_XINT13 || \
 283      (P) == PARTITION_XINT13)
 284
 285 BOOL i386DiskGetSystemVolume(char *SystemPath,
 286                              char *RemainingPath,
 287                              PULONG Device,
 288                              PULONG DriveNumber,
 289                              PULONGLONG StartSector,
 290                              PULONGLONG SectorCount,
 291                              int *FsType)
 292 {
 293         ULONG PartitionNumber;
 294         PARTITION_TABLE_ENTRY PartitionTableEntry;
 295         UCHAR VolumeType;
 296         CHAR BootPath[256];
 297         unsigned i, RosPartition;
 298
 299         /*
 300          * Verify system path
 301          */
 302         if (!DissectArcPath(SystemPath, BootPath, DriveNumber, &PartitionNumber))
 303         {
 304                 return FALSE;
 305         }
 306         if (NULL != RemainingPath)
 307         {
 308                 strcpy(RemainingPath, BootPath);
 309         }
 310
 311         /* 0xff -> no partition table present, use whole device */
 312         if (0xff == PartitionNumber)
 313         {
 314                 PartitionTableEntry.SectorCountBeforePartition = 0;
 315                 i = 0xff;
 316         }
 317         else
 318         {
 319                 /* recalculate the boot partition for freeldr */
 320                 i = 0;
 321                 RosPartition = 0;
 322                 while (1)
 323                 {
 324                         if (!MachDiskGetPartitionEntry(*DriveNumber, ++i, &PartitionTableEntry))
 325                         {
 326                                 return FALSE;
 327                         }
 328                         if (IsRecognizedPartition(PartitionTableEntry.SystemIndicator))
 329                         {
 330                                 if (++RosPartition == PartitionNumber)
 331                                 {
 332                                         break;
 333                                 }
 334                         }
 335                 }
 336         }
 337
 338         /* Check for ISO9660 file system type */
 339         if (*DriveNumber >= 0x80 && FsRecIsIso9660(*DriveNumber))
 340         {
 341                 DbgPrint((DPRINT_FILESYSTEM, "Drive is a cdrom drive. Assuming ISO-9660 file system.\n"));
 342
 343                 if (NULL != Device)
 344                 {
 345                         ((char *)Device)[0] = (char)(*DriveNumber);
 346                         ((char *)Device)[1] = (char)i;
 347                 }
 348                 *StartSector = 0;
 349                 *SectorCount = 0;
 350                 *FsType = FS_ISO9660;
 351                 return TRUE;
 352         }
 353
 354         if (!FsRecognizeVolume(*DriveNumber, PartitionTableEntry.SectorCountBeforePartition, &VolumeType))
 355         {
 356                 return FALSE;
 357         }
 358
 359         if (NULL != Device)
 360         {
 361                 ((char *)Device)[0] = (char)(*DriveNumber);
 362                 ((char *)Device)[1] = (char)i;
 363         }
 364         *StartSector = PartitionTableEntry.SectorCountBeforePartition;
 365         *SectorCount = PartitionTableEntry.PartitionSectorCount;
 366
 367         switch (VolumeType)
 368         {
 369         case PARTITION_FAT_12:
 370         case PARTITION_FAT_16:
 371         case PARTITION_HUGE:
 372         case PARTITION_XINT13:
 373         case PARTITION_FAT32:
 374         case PARTITION_FAT32_XINT13:
 375                 *FsType = FS_FAT;
 376                 return TRUE;
 377         case PARTITION_EXT2:
 378                 *FsType = FS_EXT2;
 379                 return TRUE;
 380         case PARTITION_NTFS:
 381                 *FsType = FS_NTFS;
 382                 return TRUE;
 383         default:
 384                 *FsType = 0;
 385                 return FALSE;
 386         }
 387
 388         return FALSE;
 389 }
 390
 391 BOOL
 392 i386DiskGetBootPath(char *BootPath, unsigned Size)
 393 {
 394         static char Path[] = "multi(0)disk(0)";
 395         char Device[4];
 396
 397         itoa(i386BootDrive, Device, 10);
 398         if (Size <= sizeof(Path) + 6 + strlen(Device))
 399         {
 400                 return FALSE;
 401         }
 402         strcpy(BootPath, Path);
 403         strcat(BootPath, MachDiskBootingFromFloppy() ? "fdisk" : "cdrom");
 404         strcat(strcat(strcat(BootPath, "("), Device), ")");
 405
 406         return TRUE;
 407 }
 408
 409 #endif /* defined __i386__ */
 410
 411 /* EOF */