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
  23 /////////////////////////////////////////////////////////////////////////////////////////////
  24 // FUNCTIONS
  25 /////////////////////////////////////////////////////////////////////////////////////////////
  26
  27 #ifdef __i386__
  28
  29 BOOL DiskResetController(ULONG DriveNumber)
  30 {
  31         REGS    RegsIn;
  32         REGS    RegsOut;
  33
  34         DbgPrint((DPRINT_DISK, "DiskResetController(0x%x) DISK OPERATION FAILED -- RESETTING CONTROLLER\n", DriveNumber));
  35
  36         // BIOS Int 13h, function 0 - Reset disk system
  37         // AH = 00h
  38         // DL = drive (if bit 7 is set both hard disks and floppy disks reset)
  39         // Return:
  40         // AH = status
  41         // CF clear if successful
  42         // CF set on error
  43         RegsIn.b.ah = 0x00;
  44         RegsIn.b.dl = DriveNumber;
  45
  46         // Reset the disk controller
  47         Int386(0x13, &RegsIn, &RegsOut);
  48
  49         return INT386_SUCCESS(RegsOut);
  50 }
  51
  52 BOOL DiskInt13ExtensionsSupported(ULONG DriveNumber)
  53 {
  54         REGS    RegsIn;
  55         REGS    RegsOut;
  56
  57         DbgPrint((DPRINT_DISK, "DiskInt13ExtensionsSupported()\n"));
  58
  59         // IBM/MS INT 13 Extensions - INSTALLATION CHECK
  60         // AH = 41h
  61         // BX = 55AAh
  62         // DL = drive (80h-FFh)
  63         // Return:
  64         // CF set on error (extensions not supported)
  65         // AH = 01h (invalid function)
  66         // CF clear if successful
  67         // BX = AA55h if installed
  68         // AH = major version of extensions
  69         // 01h = 1.x
  70         // 20h = 2.0 / EDD-1.0
  71         // 21h = 2.1 / EDD-1.1
  72         // 30h = EDD-3.0
  73         // AL = internal use
  74         // CX = API subset support bitmap
  75         // DH = extension version (v2.0+ ??? -- not present in 1.x)
  76         //
  77         // Bitfields for IBM/MS INT 13 Extensions API support bitmap
  78         // Bit 0, extended disk access functions (AH=42h-44h,47h,48h) supported
  79         // Bit 1, removable drive controller functions (AH=45h,46h,48h,49h,INT 15/AH=52h) supported
  80         // Bit 2, enhanced disk drive (EDD) functions (AH=48h,AH=4Eh) supported
  81         //        extended drive parameter table is valid
  82         // Bits 3-15 reserved
  83         RegsIn.b.ah = 0x41;
  84         RegsIn.w.bx = 0x55AA;
  85         RegsIn.b.dl = DriveNumber;
  86
  87         // Reset the disk controller
  88         Int386(0x13, &RegsIn, &RegsOut);
  89
  90         if (!INT386_SUCCESS(RegsOut))
  91         {
  92                 // CF set on error (extensions not supported)
  93                 return FALSE;
  94         }
  95
  96         if (RegsOut.w.bx != 0xAA55)
  97         {
  98                 // BX = AA55h if installed
  99                 return FALSE;
 100         }
 101
 102         // Note:
 103         // The original check is too strict because some BIOSes report that
 104         // extended disk access functions are not suported when booting
 105         // from a CD (e.g. Phoenix BIOS v6.00PG). Argh!
 106 #if 0
 107         if (!(RegsOut.w.cx & 0x0001))
 108         {
 109                 // CX = API subset support bitmap
 110                 // Bit 0, extended disk access functions (AH=42h-44h,47h,48h) supported
 111                 return FALSE;
 112         }
 113 #endif
 114
 115         // Use this relaxed check instead
 116         if (RegsOut.w.cx == 0x0000)
 117         {
 118                 // CX = API subset support bitmap
 119                 return FALSE;
 120         }
 121
 122         return TRUE;
 123 }
 124
 125 VOID DiskStopFloppyMotor(VOID)
 126 {
 127         WRITE_PORT_UCHAR((PUCHAR)0x3F2, 0);
 128 }
 129
 130 BOOL DiskGetExtendedDriveParameters(ULONG DriveNumber, PVOID Buffer, USHORT BufferSize)
 131 {
 132         REGS    RegsIn;
 133         REGS    RegsOut;
 134         PUSHORT Ptr = (PUSHORT)(BIOSCALLBUFFER);
 135
 136         DbgPrint((DPRINT_DISK, "DiskGetExtendedDriveParameters()\n"));
 137
 138         // Initialize transfer buffer
 139         *Ptr = BufferSize;
 140
 141         // BIOS Int 13h, function 48h - Get drive parameters
 142         // AH = 48h
 143         // DL = drive (bit 7 set for hard disk)
 144         // DS:SI = result buffer
 145         // Return:
 146         // CF set on error
 147         // AH = status (07h)
 148         // CF clear if successful
 149         // AH = 00h
 150         // DS:SI -> result buffer
 151         RegsIn.b.ah = 0x48;
 152         RegsIn.b.dl = DriveNumber;
 153         RegsIn.x.ds = BIOSCALLBUFSEGMENT;       // DS:SI -> result buffer
 154         RegsIn.w.si = BIOSCALLBUFOFFSET;
 155
 156         // Get drive parameters
 157         Int386(0x13, &RegsIn, &RegsOut);
 158
 159         if (!INT386_SUCCESS(RegsOut))
 160         {
 161                 return FALSE;
 162         }
 163
 164         memcpy(Buffer, Ptr, BufferSize);
 165
 166         return TRUE;
 167 }
 168
 169 #endif // defined __i386__