3 * Copyright (C) 1998-2003 Brian Palmer <brianp@sginet.com>
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.
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.
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.
32 UCHAR PacketSize
; // 00h - Size of packet (10h or 18h)
33 UCHAR Reserved
; // 01h - Reserved (0)
34 USHORT LBABlockCount
; // 02h - Number of blocks to transfer (max 007Fh for Phoenix EDD)
35 USHORT TransferBufferOffset
; // 04h - Transfer buffer offset (seg:off)
36 USHORT TransferBufferSegment
; // Transfer buffer segment (seg:off)
37 ULONGLONG LBAStartBlock
; // 08h - Starting absolute block number
38 ULONGLONG TransferBuffer64
; // 10h - (EDD-3.0, optional) 64-bit flat address of transfer buffer
39 // used if DWORD at 04h is FFFFh:FFFFh
40 } PACKED I386_DISK_ADDRESS_PACKET
, *PI386_DISK_ADDRESS_PACKET
;
42 /////////////////////////////////////////////////////////////////////////////////////////////
44 /////////////////////////////////////////////////////////////////////////////////////////////
46 static BOOL
PcDiskResetController(ULONG DriveNumber
)
51 DbgPrint((DPRINT_DISK
, "PcDiskResetController(0x%x) DISK OPERATION FAILED -- RESETTING CONTROLLER\n", DriveNumber
));
53 // BIOS Int 13h, function 0 - Reset disk system
55 // DL = drive (if bit 7 is set both hard disks and floppy disks reset)
58 // CF clear if successful
61 RegsIn
.b
.dl
= DriveNumber
;
63 // Reset the disk controller
64 Int386(0x13, &RegsIn
, &RegsOut
);
66 return INT386_SUCCESS(RegsOut
);
69 static BOOL
PcDiskReadLogicalSectorsLBA(ULONG DriveNumber
, ULONGLONG SectorNumber
, ULONG SectorCount
, PVOID Buffer
)
74 PI386_DISK_ADDRESS_PACKET Packet
= (PI386_DISK_ADDRESS_PACKET
)(BIOSCALLBUFFER
);
76 DbgPrint((DPRINT_DISK
, "PcDiskReadLogicalSectorsLBA() DriveNumber: 0x%x SectorNumber: %I64d SectorCount: %d Buffer: 0x%x\n", DriveNumber
, SectorNumber
, SectorCount
, Buffer
));
78 // BIOS int 0x13, function 42h - IBM/MS INT 13 Extensions - EXTENDED READ
79 RegsIn
.b
.ah
= 0x42; // Subfunction 42h
80 RegsIn
.b
.dl
= DriveNumber
; // Drive number in DL (0 - floppy, 0x80 - harddisk)
81 RegsIn
.x
.ds
= BIOSCALLBUFSEGMENT
; // DS:SI -> disk address packet
82 RegsIn
.w
.si
= BIOSCALLBUFOFFSET
;
84 // Setup disk address packet
85 RtlZeroMemory(Packet
, sizeof(I386_DISK_ADDRESS_PACKET
));
86 Packet
->PacketSize
= sizeof(I386_DISK_ADDRESS_PACKET
);
88 Packet
->LBABlockCount
= SectorCount
;
89 Packet
->TransferBufferOffset
= ((ULONG
)Buffer
) & 0x0F;
90 Packet
->TransferBufferSegment
= ((ULONG
)Buffer
) >> 4;
91 Packet
->LBAStartBlock
= SectorNumber
;
92 Packet
->TransferBuffer64
= 0;
94 // BIOS int 0x13, function 42h - IBM/MS INT 13 Extensions - EXTENDED READ
96 // CF clear if successful
100 // disk address packet's block count field set to the
101 // number of blocks successfully transferred
104 for (RetryCount
=0; RetryCount
<3; RetryCount
++)
106 Int386(0x13, &RegsIn
, &RegsOut
);
108 // If it worked return TRUE
109 if (INT386_SUCCESS(RegsOut
))
113 // If it was a corrected ECC error then the data is still good
114 else if (RegsOut
.b
.ah
== 0x11)
118 // If it failed the do the next retry
121 PcDiskResetController(DriveNumber
);
127 // If we get here then the read failed
128 DiskError("Disk Read Failed", RegsOut
.b
.ah
);
133 static BOOL
PcDiskReadLogicalSectorsCHS(ULONG DriveNumber
, ULONGLONG SectorNumber
, ULONG SectorCount
, PVOID Buffer
)
135 ULONG PhysicalSector
;
138 GEOMETRY DriveGeometry
;
139 ULONG NumberOfSectorsToRead
;
144 DbgPrint((DPRINT_DISK
, "PcDiskReadLogicalSectorsCHS()\n"));
147 // Get the drive geometry
149 if (!MachDiskGetDriveGeometry(DriveNumber
, &DriveGeometry
) ||
150 DriveGeometry
.Sectors
== 0 ||
151 DriveGeometry
.Heads
== 0)
160 // Calculate the physical disk offsets
162 PhysicalSector
= 1 + (SectorNumber
% DriveGeometry
.Sectors
);
163 PhysicalHead
= (SectorNumber
/ DriveGeometry
.Sectors
) % DriveGeometry
.Heads
;
164 PhysicalTrack
= (SectorNumber
/ DriveGeometry
.Sectors
) / DriveGeometry
.Heads
;
167 // Calculate how many sectors we need to read this round
169 if (PhysicalSector
> 1)
171 if (SectorCount
>= (DriveGeometry
.Sectors
- (PhysicalSector
- 1)))
172 NumberOfSectorsToRead
= (DriveGeometry
.Sectors
- (PhysicalSector
- 1));
174 NumberOfSectorsToRead
= SectorCount
;
178 if (SectorCount
>= DriveGeometry
.Sectors
)
179 NumberOfSectorsToRead
= DriveGeometry
.Sectors
;
181 NumberOfSectorsToRead
= SectorCount
;
185 // Make sure the read is within the geometry boundaries
187 if ((PhysicalHead
>= DriveGeometry
.Heads
) ||
188 (PhysicalTrack
>= DriveGeometry
.Cylinders
) ||
189 ((NumberOfSectorsToRead
+ PhysicalSector
) > (DriveGeometry
.Sectors
+ 1)) ||
190 (PhysicalSector
> DriveGeometry
.Sectors
))
192 DiskError("Disk read exceeds drive geometry limits.", 0);
196 // BIOS Int 13h, function 2 - Read Disk Sectors
198 // AL = number of sectors to read (must be nonzero)
199 // CH = low eight bits of cylinder number
200 // CL = sector number 1-63 (bits 0-5)
201 // high two bits of cylinder (bits 6-7, hard disk only)
203 // DL = drive number (bit 7 set for hard disk)
204 // ES:BX -> data buffer
207 // if AH = 11h (corrected ECC error), AL = burst length
208 // CF clear if successful
210 // AL = number of sectors transferred
211 // (only valid if CF set for some BIOSes)
213 RegsIn
.b
.al
= NumberOfSectorsToRead
;
214 RegsIn
.b
.ch
= (PhysicalTrack
& 0xFF);
215 RegsIn
.b
.cl
= (PhysicalSector
+ ((PhysicalTrack
& 0x300) >> 2));
216 RegsIn
.b
.dh
= PhysicalHead
;
217 RegsIn
.b
.dl
= DriveNumber
;
218 RegsIn
.w
.es
= ((ULONG
)Buffer
) >> 4;
219 RegsIn
.w
.bx
= ((ULONG
)Buffer
) & 0x0F;
225 for (RetryCount
=0; RetryCount
<3; RetryCount
++)
227 Int386(0x13, &RegsIn
, &RegsOut
);
229 // If it worked break out
230 if (INT386_SUCCESS(RegsOut
))
234 // If it was a corrected ECC error then the data is still good
235 else if (RegsOut
.b
.ah
== 0x11)
239 // If it failed the do the next retry
242 PcDiskResetController(DriveNumber
);
248 // If we retried 3 times then fail
251 DiskError("Disk Read Failed", RegsOut
.b
.ah
);
255 // I have learned that not all bioses return
256 // the sector read count in the AL register (at least mine doesn't)
257 // even if the sectors were read correctly. So instead
258 // of checking the sector read count we will rely solely
259 // on the carry flag being set on error
261 Buffer
+= (NumberOfSectorsToRead
* DriveGeometry
.BytesPerSector
);
262 SectorCount
-= NumberOfSectorsToRead
;
263 SectorNumber
+= NumberOfSectorsToRead
;
269 static BOOL
PcDiskInt13ExtensionsSupported(ULONG DriveNumber
)
271 static ULONG LastDriveNumber
= 0xffffffff;
272 static BOOL LastSupported
;
276 DbgPrint((DPRINT_DISK
, "PcDiskInt13ExtensionsSupported()\n"));
278 if (DriveNumber
== LastDriveNumber
)
280 DbgPrint((DPRINT_DISK
, "Using cached value %s for drive 0x%x\n", LastSupported
? "TRUE" : "FALSE", DriveNumber
));
281 return LastSupported
;
284 LastDriveNumber
= DriveNumber
;
286 // IBM/MS INT 13 Extensions - INSTALLATION CHECK
289 // DL = drive (80h-FFh)
291 // CF set on error (extensions not supported)
292 // AH = 01h (invalid function)
293 // CF clear if successful
294 // BX = AA55h if installed
295 // AH = major version of extensions
297 // 20h = 2.0 / EDD-1.0
298 // 21h = 2.1 / EDD-1.1
301 // CX = API subset support bitmap
302 // DH = extension version (v2.0+ ??? -- not present in 1.x)
304 // Bitfields for IBM/MS INT 13 Extensions API support bitmap
305 // Bit 0, extended disk access functions (AH=42h-44h,47h,48h) supported
306 // Bit 1, removable drive controller functions (AH=45h,46h,48h,49h,INT 15/AH=52h) supported
307 // Bit 2, enhanced disk drive (EDD) functions (AH=48h,AH=4Eh) supported
308 // extended drive parameter table is valid
309 // Bits 3-15 reserved
311 RegsIn
.w
.bx
= 0x55AA;
312 RegsIn
.b
.dl
= DriveNumber
;
314 // Reset the disk controller
315 Int386(0x13, &RegsIn
, &RegsOut
);
317 if (!INT386_SUCCESS(RegsOut
))
319 // CF set on error (extensions not supported)
320 LastSupported
= FALSE
;
324 if (RegsOut
.w
.bx
!= 0xAA55)
326 // BX = AA55h if installed
327 LastSupported
= FALSE
;
332 // The original check is too strict because some BIOSes report that
333 // extended disk access functions are not suported when booting
334 // from a CD (e.g. Phoenix BIOS v6.00PG). Argh!
336 if (!(RegsOut
.w
.cx
& 0x0001))
338 // CX = API subset support bitmap
339 // Bit 0, extended disk access functions (AH=42h-44h,47h,48h) supported
340 LastSupported
= FALSE
;
345 // Use this relaxed check instead (most BIOSes seem to use 0x9f as CD-Rom)
346 if (RegsOut
.w
.cx
== 0x0000 && DriveNumber
!= 0x9f)
348 // CX = API subset support bitmap
349 printf("Suspicious API subset support bitmap 0x%x on device 0x%x\n", RegsOut
.w
.cx
, DriveNumber
);
350 LastSupported
= FALSE
;
351 return LastSupported
;
354 LastSupported
= TRUE
;
358 BOOL
PcDiskReadLogicalSectors(ULONG DriveNumber
, ULONGLONG SectorNumber
, ULONG SectorCount
, PVOID Buffer
)
361 DbgPrint((DPRINT_DISK
, "PcDiskReadLogicalSectors() DriveNumber: 0x%x SectorNumber: %I64d SectorCount: %d Buffer: 0x%x\n", DriveNumber
, SectorNumber
, SectorCount
, Buffer
));
364 // Check to see if it is a fixed disk drive
365 // If so then check to see if Int13 extensions work
366 // If they do then use them, otherwise default back to BIOS calls
368 if ((DriveNumber
>= 0x80) && PcDiskInt13ExtensionsSupported(DriveNumber
))
370 DbgPrint((DPRINT_DISK
, "Using Int 13 Extensions for read. PcDiskInt13ExtensionsSupported(%d) = %s\n", DriveNumber
, PcDiskInt13ExtensionsSupported(DriveNumber
) ? "TRUE" : "FALSE"));
373 // LBA is easy, nothing to calculate
376 return PcDiskReadLogicalSectorsLBA(DriveNumber
, SectorNumber
, SectorCount
, Buffer
);
380 // LBA is not supported default to the CHS calls
381 return PcDiskReadLogicalSectorsCHS(DriveNumber
, SectorNumber
, SectorCount
, Buffer
);
388 PcDiskGetPartitionEntry(ULONG DriveNumber
, ULONG PartitionNumber
, PPARTITION_TABLE_ENTRY PartitionTableEntry
)
390 /* Just use the standard routine */
391 return DiskGetPartitionEntry(DriveNumber
, PartitionNumber
, PartitionTableEntry
);
395 PcDiskGetDriveGeometry(ULONG DriveNumber
, PGEOMETRY Geometry
)
401 DbgPrint((DPRINT_DISK
, "DiskGetDriveGeometry()\n"));
403 /* BIOS Int 13h, function 08h - Get drive parameters
405 * DL = drive (bit 7 set for hard disk)
406 * ES:DI = 0000h:0000h to guard against BIOS bugs
410 * CF clear if successful
412 * AL = 00h on at least some BIOSes
413 * BL = drive type (AT/PS2 floppies only)
414 * CH = low eight bits of maximum cylinder number
415 * CL = maximum sector number (bits 5-0)
416 * high two bits of maximum cylinder number (bits 7-6)
417 * DH = maximum head number
418 * DL = number of drives
419 * ES:DI -> drive parameter table (floppies only)
422 RegsIn
.b
.dl
= DriveNumber
;
423 RegsIn
.w
.es
= 0x0000;
424 RegsIn
.w
.di
= 0x0000;
426 /* Get drive parameters */
427 Int386(0x13, &RegsIn
, &RegsOut
);
429 if (! INT386_SUCCESS(RegsOut
))
434 Cylinders
= (RegsOut
.b
.cl
& 0xC0) << 2;
435 Cylinders
+= RegsOut
.b
.ch
;
437 Geometry
->Cylinders
= Cylinders
;
438 Geometry
->Heads
= RegsOut
.b
.dh
+ 1;
439 Geometry
->Sectors
= RegsOut
.b
.cl
& 0x3F;
440 Geometry
->BytesPerSector
= 512; /* Just assume 512 bytes per sector */
446 PcDiskGetCacheableBlockCount(ULONG DriveNumber
)
450 /* If LBA is supported then the block size will be 64 sectors (32k)
451 * If not then the block size is the size of one track */
452 if (DiskInt13ExtensionsSupported(DriveNumber
))
456 /* Get the disk geometry
457 * If this fails then we will just return 1 sector to be safe */
458 else if (! PcDiskGetDriveGeometry(DriveNumber
, &Geometry
))
464 return Geometry
.Sectors
;