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         DbgPrint((DPRINT_DISK, "size of buffer:                          %x\n", Ptr[0]));
 169         DbgPrint((DPRINT_DISK, "information flags:                       %x\n", Ptr[1]));
 170         DbgPrint((DPRINT_DISK, "number of physical cylinders on drive:   %u\n", *(PULONG)&Ptr[2]));
 171         DbgPrint((DPRINT_DISK, "number of physical heads on drive:       %u\n", *(PULONG)&Ptr[4]));
 172         DbgPrint((DPRINT_DISK, "number of physical sectors per track:    %u\n", *(PULONG)&Ptr[6]));
 173         DbgPrint((DPRINT_DISK, "total number of sectors on drive:        %I64u\n", *(unsigned long long*)&Ptr[8]));
 174         DbgPrint((DPRINT_DISK, "bytes per sector:                        %u\n", Ptr[12]));
 175         if (Ptr[0] >= 0x1e)
 176         {
 177             DbgPrint((DPRINT_HB, "EED configuration parameters:            %x:%x\n", Ptr[13], Ptr[14]));
 178             if (Ptr[13] != 0xffff && Ptr[14] != 0xffff)
 179             {
 180                PUCHAR SpecPtr = (PUCHAR)((Ptr[13] << 4) + Ptr[14]);
 181                DbgPrint((DPRINT_DISK, "SpecPtr:                                 %x\n", SpecPtr));
 182                DbgPrint((DPRINT_DISK, "physical I/O port base address:          %x\n", *(PUSHORT)&SpecPtr[0]));
 183                DbgPrint((DPRINT_DISK, "disk-drive control port address:         %x\n", *(PUSHORT)&SpecPtr[2]));
 184                DbgPrint((DPRINT_DISK, "drive flags:                             %x\n", SpecPtr[4]));
 185                DbgPrint((DPRINT_DISK, "proprietary information:                 %x\n", SpecPtr[5]));
 186                DbgPrint((DPRINT_DISK, "IRQ for drive:                           %u\n", SpecPtr[6]));
 187                DbgPrint((DPRINT_DISK, "sector count for multi-sector transfers: %u\n", SpecPtr[7]));
 188                DbgPrint((DPRINT_DISK, "DMA control:                             %x\n", SpecPtr[8]));
 189                DbgPrint((DPRINT_DISK, "programmed I/O control:                  %x\n", SpecPtr[9]));
 190                DbgPrint((DPRINT_DISK, "drive options:                           %x\n", *(PUSHORT)&SpecPtr[10]));
 191             }
 192         }
 193         if (Ptr[0] >= 0x42)
 194         {
 195             DbgPrint((DPRINT_HB, "signature:                             %x\n", Ptr[15]));
 196         }
 197
 198         return TRUE;
 199 }
 200
 201 BOOL i386DiskGetBootVolume(PULONG DriveNumber, PULONGLONG StartSector, PULONGLONG SectorCount, int *FsType)
 202 {
 203         PARTITION_TABLE_ENTRY   PartitionTableEntry;
 204         UCHAR                   VolumeType;
 205
 206         DbgPrint((DPRINT_FILESYSTEM, "FsOpenVolume() DriveNumber: 0x%x PartitionNumber: 0x%x\n", i386BootDrive, i386BootPartition));
 207
 208         // Check and see if it is a floppy drive
 209         // If so then just assume FAT12 file system type
 210         if (DiskIsDriveRemovable(i386BootDrive))
 211         {
 212                 DbgPrint((DPRINT_FILESYSTEM, "Drive is a floppy diskette drive. Assuming FAT12 file system.\n"));
 213
 214                 *DriveNumber = i386BootDrive;
 215                 *StartSector = 0;
 216                 *SectorCount = 2 * 80 * 18; /* FIXME hardcoded for 1.44 Mb */
 217                 *FsType = FS_FAT;
 218                 return TRUE;
 219         }
 220
 221         // Check for ISO9660 file system type
 222         if (i386BootDrive >= 0x80 && FsRecIsIso9660(i386BootDrive))
 223         {
 224                 DbgPrint((DPRINT_FILESYSTEM, "Drive is a cdrom drive. Assuming ISO-9660 file system.\n"));
 225
 226                 *DriveNumber = i386BootDrive;
 227                 *StartSector = 0;
 228                 *SectorCount = 0;
 229                 *FsType = FS_ISO9660;
 230                 return TRUE;
 231         }
 232
 233         // Get the requested partition entry
 234         if (i386BootPartition == 0)
 235         {
 236                 // Partition requested was zero which means the boot partition
 237                 if (! DiskGetActivePartitionEntry(i386BootDrive, &PartitionTableEntry))
 238                 {
 239                         /* Try partition-less disk */
 240                         *StartSector = 0;
 241                         *SectorCount = 0;
 242                 }
 243                 /* Check for valid partition */
 244                 else if (PartitionTableEntry.SystemIndicator == PARTITION_ENTRY_UNUSED)
 245                 {
 246                         return FALSE;
 247                 }
 248                 else
 249                 {
 250                         *StartSector = PartitionTableEntry.SectorCountBeforePartition;
 251                         *SectorCount = PartitionTableEntry.PartitionSectorCount;
 252                 }
 253         }
 254         else if (0xff == i386BootPartition)
 255         {
 256                 /* Partition-less disk */
 257                 *StartSector = 0;
 258                 *SectorCount = 0;
 259         }
 260         else
 261         {
 262                 // Get requested partition
 263                 if (! MachDiskGetPartitionEntry(i386BootDrive, i386BootPartition, &PartitionTableEntry))
 264                 {
 265                         return FALSE;
 266                 }
 267                 /* Check for valid partition */
 268                 else if (PartitionTableEntry.SystemIndicator == PARTITION_ENTRY_UNUSED)
 269                 {
 270                         return FALSE;
 271                 }
 272                 else
 273                 {
 274                         *StartSector = PartitionTableEntry.SectorCountBeforePartition;
 275                         *SectorCount = PartitionTableEntry.PartitionSectorCount;
 276                 }
 277         }
 278
 279         // Try to recognize the file system
 280         if (!FsRecognizeVolume(i386BootDrive, *StartSector, &VolumeType))
 281         {
 282                 return FALSE;
 283         }
 284
 285         *DriveNumber = i386BootDrive;
 286
 287         switch (VolumeType)
 288         {
 289         case PARTITION_FAT_12:
 290         case PARTITION_FAT_16:
 291         case PARTITION_HUGE:
 292         case PARTITION_XINT13:
 293         case PARTITION_FAT32:
 294         case PARTITION_FAT32_XINT13:
 295                 *FsType = FS_FAT;
 296                 return TRUE;
 297         case PARTITION_EXT2:
 298                 *FsType = FS_EXT2;
 299                 return TRUE;
 300         case PARTITION_NTFS:
 301                 *FsType = FS_NTFS;
 302                 return TRUE;
 303         default:
 304                 *FsType = 0;
 305                 return FALSE;
 306         }
 307
 308         return TRUE;
 309 }
 310
 311 VOID
 312 i386DiskGetBootDevice(PULONG BootDevice)
 313 {
 314   ((char *)BootDevice)[0] = (char)i386BootDrive;
 315   ((char *)BootDevice)[1] = (char)i386BootPartition;
 316 }
 317
 318 BOOL
 319 i386DiskBootingFromFloppy(VOID)
 320 {
 321   return i386BootDrive < 0x80;
 322 }
 323
 324 #define IsRecognizedPartition(P)  \
 325     ((P) == PARTITION_FAT_12       || \
 326      (P) == PARTITION_FAT_16       || \
 327      (P) == PARTITION_HUGE         || \
 328      (P) == PARTITION_IFS          || \
 329      (P) == PARTITION_EXT2         || \
 330      (P) == PARTITION_FAT32        || \
 331      (P) == PARTITION_FAT32_XINT13 || \
 332      (P) == PARTITION_XINT13)
 333
 334 #define IsContainerPartition(P) \
 335     ((P) == PARTITION_EXTENDED         || \
 336      (P) == PARTITION_XINT13_EXTENDED)
 337
 338 BOOL i386DiskGetSystemVolume(char *SystemPath,
 339                              char *RemainingPath,
 340                              PULONG Device,
 341                              PULONG DriveNumber,
 342                              PULONGLONG StartSector,
 343                              PULONGLONG SectorCount,
 344                              int *FsType)
 345 {
 346         ULONG PartitionNumber;
 347         PARTITION_TABLE_ENTRY PartitionTableEntry;
 348         UCHAR VolumeType;
 349         CHAR BootPath[256];
 350         unsigned i, RosPartition;
 351
 352         /*
 353          * Verify system path
 354          */
 355         if (!DissectArcPath(SystemPath, BootPath, DriveNumber, &PartitionNumber))
 356         {
 357                 return FALSE;
 358         }
 359         if (NULL != RemainingPath)
 360         {
 361                 strcpy(RemainingPath, BootPath);
 362         }
 363
 364         /* 0xff -> no partition table present, use whole device */
 365         if (0xff == PartitionNumber)
 366         {
 367                 PartitionTableEntry.SectorCountBeforePartition = 0;
 368                 i = 0xff;
 369         }
 370         else
 371         {
 372                 /* recalculate the boot partition for freeldr */
 373                 i = 0;
 374                 RosPartition = 0;
 375                 while (1)
 376                 {
 377                         if (!MachDiskGetPartitionEntry(*DriveNumber, ++i, &PartitionTableEntry))
 378                         {
 379                                 return FALSE;
 380                         }
 381                         if (!IsContainerPartition(PartitionTableEntry.SystemIndicator) &&
 382                             PartitionTableEntry.SystemIndicator != PARTITION_ENTRY_UNUSED)
 383                         {
 384                                 if (++RosPartition == PartitionNumber)
 385                                 {
 386                                         break;
 387                                 }
 388                         }
 389                 }
 390         }
 391
 392         /* Check for ISO9660 file system type */
 393         if (*DriveNumber >= 0x80 && FsRecIsIso9660(*DriveNumber))
 394         {
 395                 DbgPrint((DPRINT_FILESYSTEM, "Drive is a cdrom drive. Assuming ISO-9660 file system.\n"));
 396
 397                 if (NULL != Device)
 398                 {
 399                         ((char *)Device)[0] = (char)(*DriveNumber);
 400                         ((char *)Device)[1] = (char)i;
 401                 }
 402                 *StartSector = 0;
 403                 *SectorCount = 0;
 404                 *FsType = FS_ISO9660;
 405                 return TRUE;
 406         }
 407
 408         if (!FsRecognizeVolume(*DriveNumber, PartitionTableEntry.SectorCountBeforePartition, &VolumeType))
 409         {
 410                 return FALSE;
 411         }
 412
 413         if (NULL != Device)
 414         {
 415                 ((char *)Device)[0] = (char)(*DriveNumber);
 416                 ((char *)Device)[1] = (char)i;
 417         }
 418         *StartSector = PartitionTableEntry.SectorCountBeforePartition;
 419         *SectorCount = PartitionTableEntry.PartitionSectorCount;
 420
 421         switch (VolumeType)
 422         {
 423         case PARTITION_FAT_12:
 424         case PARTITION_FAT_16:
 425         case PARTITION_HUGE:
 426         case PARTITION_XINT13:
 427         case PARTITION_FAT32:
 428         case PARTITION_FAT32_XINT13:
 429                 *FsType = FS_FAT;
 430                 return TRUE;
 431         case PARTITION_EXT2:
 432                 *FsType = FS_EXT2;
 433                 return TRUE;
 434         case PARTITION_NTFS:
 435                 *FsType = FS_NTFS;
 436                 return TRUE;
 437         default:
 438                 *FsType = 0;
 439                 return FALSE;
 440         }
 441
 442         return FALSE;
 443 }
 444
 445 BOOL
 446 i386DiskGetBootPath(char *BootPath, unsigned Size)
 447 {
 448         static char Path[] = "multi(0)disk(0)";
 449         char Device[4];
 450
 451         itoa(i386BootDrive, Device, 10);
 452         if (Size <= sizeof(Path) + 6 + strlen(Device))
 453         {
 454                 return FALSE;
 455         }
 456         strcpy(BootPath, Path);
 457         strcat(BootPath, MachDiskBootingFromFloppy() ? "fdisk" : "cdrom");
 458         strcat(strcat(strcat(BootPath, "("), Device), ")");
 459
 460         return TRUE;
 461 }
 462
 463 #endif /* defined __i386__ */
 464
 465 /* EOF */