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
  22 #define NDEBUG
  23 #include <debug.h>
  24
  25 /////////////////////////////////////////////////////////////////////////////////////////////
  26 // FUNCTIONS
  27 /////////////////////////////////////////////////////////////////////////////////////////////
  28
  29 #ifdef __i386__
  30
  31 BOOLEAN 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 BOOLEAN 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 BOOLEAN 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_DISK, "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_DISK, "signature:                             %x\n", Ptr[15]));
 196     }
 197
 198         return TRUE;
 199 }
 200
 201 #endif /* defined __i386__ */
 202
 203 /* EOF */