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 "disk.h"
  22 #include "rtl.h"
  23 #include "arch.h"
  24 #include "debug.h"
  25 #include "portio.h"
  26 #include "machine.h"
  27
  28
  29 /////////////////////////////////////////////////////////////////////////////////////////////
  30 // FUNCTIONS
  31 /////////////////////////////////////////////////////////////////////////////////////////////
  32
  33 #ifdef __i386__
  34
  35 BOOL DiskResetController(U32 DriveNumber)
  36 {
  37         REGS    RegsIn;
  38         REGS    RegsOut;
  39
  40         DbgPrint((DPRINT_DISK, "DiskResetController(0x%x) DISK OPERATION FAILED -- RESETTING CONTROLLER\n", DriveNumber));
  41
  42         // BIOS Int 13h, function 0 - Reset disk system
  43         // AH = 00h
  44         // DL = drive (if bit 7 is set both hard disks and floppy disks reset)
  45         // Return:
  46         // AH = status
  47         // CF clear if successful
  48         // CF set on error
  49         RegsIn.b.ah = 0x00;
  50         RegsIn.b.dl = DriveNumber;
  51
  52         // Reset the disk controller
  53         Int386(0x13, &RegsIn, &RegsOut);
  54
  55         return INT386_SUCCESS(RegsOut);
  56 }
  57
  58 BOOL DiskInt13ExtensionsSupported(U32 DriveNumber)
  59 {
  60         REGS    RegsIn;
  61         REGS    RegsOut;
  62
  63         DbgPrint((DPRINT_DISK, "DiskInt13ExtensionsSupported()\n"));
  64
  65         // IBM/MS INT 13 Extensions - INSTALLATION CHECK
  66         // AH = 41h
  67         // BX = 55AAh
  68         // DL = drive (80h-FFh)
  69         // Return:
  70         // CF set on error (extensions not supported)
  71         // AH = 01h (invalid function)
  72         // CF clear if successful
  73         // BX = AA55h if installed
  74         // AH = major version of extensions
  75         // 01h = 1.x
  76         // 20h = 2.0 / EDD-1.0
  77         // 21h = 2.1 / EDD-1.1
  78         // 30h = EDD-3.0
  79         // AL = internal use
  80         // CX = API subset support bitmap
  81         // DH = extension version (v2.0+ ??? -- not present in 1.x)
  82         //
  83         // Bitfields for IBM/MS INT 13 Extensions API support bitmap
  84         // Bit 0, extended disk access functions (AH=42h-44h,47h,48h) supported
  85         // Bit 1, removable drive controller functions (AH=45h,46h,48h,49h,INT 15/AH=52h) supported
  86         // Bit 2, enhanced disk drive (EDD) functions (AH=48h,AH=4Eh) supported
  87         //        extended drive parameter table is valid
  88         // Bits 3-15 reserved
  89         RegsIn.b.ah = 0x41;
  90         RegsIn.w.bx = 0x55AA;
  91         RegsIn.b.dl = DriveNumber;
  92
  93         // Reset the disk controller
  94         Int386(0x13, &RegsIn, &RegsOut);
  95
  96         if (!INT386_SUCCESS(RegsOut))
  97         {
  98                 // CF set on error (extensions not supported)
  99                 return FALSE;
 100         }
 101
 102         if (RegsOut.w.bx != 0xAA55)
 103         {
 104                 // BX = AA55h if installed
 105                 return FALSE;
 106         }
 107
 108         // Note:
 109         // The original check is too strict because some BIOSes report that
 110         // extended disk access functions are not suported when booting
 111         // from a CD (e.g. Phoenix BIOS v6.00PG). Argh!
 112 #if 0
 113         if (!(RegsOut.w.cx & 0x0001))
 114         {
 115                 // CX = API subset support bitmap
 116                 // Bit 0, extended disk access functions (AH=42h-44h,47h,48h) supported
 117                 return FALSE;
 118         }
 119 #endif
 120
 121         // Use this relaxed check instead
 122         if (RegsOut.w.cx == 0x0000)
 123         {
 124                 // CX = API subset support bitmap
 125                 return FALSE;
 126         }
 127
 128         return TRUE;
 129 }
 130
 131 VOID DiskStopFloppyMotor(VOID)
 132 {
 133         WRITE_PORT_UCHAR((PUCHAR)0x3F2, 0);
 134 }
 135
 136 BOOL DiskGetExtendedDriveParameters(U32 DriveNumber, PVOID Buffer, U16 BufferSize)
 137 {
 138         REGS    RegsIn;
 139         REGS    RegsOut;
 140         PU16    Ptr = (PU16)(BIOSCALLBUFFER);
 141
 142         DbgPrint((DPRINT_DISK, "DiskGetExtendedDriveParameters()\n"));
 143
 144         // Initialize transfer buffer
 145         *Ptr = BufferSize;
 146
 147         // BIOS Int 13h, function 48h - Get drive parameters
 148         // AH = 48h
 149         // DL = drive (bit 7 set for hard disk)
 150         // DS:SI = result buffer
 151         // Return:
 152         // CF set on error
 153         // AH = status (07h)
 154         // CF clear if successful
 155         // AH = 00h
 156         // DS:SI -> result buffer
 157         RegsIn.b.ah = 0x48;
 158         RegsIn.b.dl = DriveNumber;
 159         RegsIn.x.ds = BIOSCALLBUFSEGMENT;       // DS:SI -> result buffer
 160         RegsIn.w.si = BIOSCALLBUFOFFSET;
 161
 162         // Get drive parameters
 163         Int386(0x13, &RegsIn, &RegsOut);
 164
 165         if (!INT386_SUCCESS(RegsOut))
 166         {
 167                 return FALSE;
 168         }
 169
 170         memcpy(Buffer, Ptr, BufferSize);
 171
 172         return TRUE;
 173 }
 174
 175 #endif // defined __i386__