freeldr/freeldr/miscboot.c

   1 /*
   2  *  FreeLoader
   3  *  Copyright (C) 1999, 2000  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
  21 #include "freeldr.h"
  22 #include "asmcode.h"
  23 #include "miscboot.h"
  24 #include "stdlib.h"
  25 #include "fs.h"
  26 #include "tui.h"
  27
  28 void LoadAndBootBootSector(int nOSToBoot)
  29 {
  30         FILE    file;
  31         char    name[260];
  32         char    value[260];
  33         char    szFileName[1024];
  34         int             i;
  35
  36         // Find all the message box settings and run them
  37         for (i=1; i<=GetNumSectionItems(OSList[nOSToBoot].name); i++)
  38         {
  39                 ReadSectionSettingByNumber(OSList[nOSToBoot].name, i, name, value);
  40                 if (stricmp(name, "MessageBox") == 0)
  41                         MessageBox(value);
  42                 if (stricmp(name, "MessageLine") == 0)
  43                         MessageLine(value);
  44         }
  45
  46         if (!ReadSectionSettingByName(OSList[nOSToBoot].name, "BootDrive", name, value))
  47         {
  48                 MessageBox("Boot drive not specified for selected OS!");
  49                 return;
  50         }
  51
  52         BootDrive = atoi(value);
  53
  54         BootPartition = 0;
  55         if (ReadSectionSettingByName(OSList[nOSToBoot].name, "BootPartition", name, value))
  56                 BootPartition = atoi(value);
  57
  58         if (!ReadSectionSettingByName(OSList[nOSToBoot].name, "BootSector", name, value))
  59         {
  60                 MessageBox("Boot sector file not specified for selected OS!");
  61                 return;
  62         }
  63
  64         if (!OpenDiskDrive(BootDrive, BootPartition))
  65         {
  66                 MessageBox("Failed to open boot drive.");
  67                 return;
  68         }
  69
  70         strcpy(szFileName, value);
  71         if (!OpenFile(szFileName, &file))
  72         {
  73                 strcat(value, " not found.");
  74                 MessageBox(value);
  75                 return;
  76         }
  77
  78         // Read boot sector
  79         if (ReadFile(&file, 512, (void*)0x7c00) != 512)
  80         {
  81                 MessageBox("Disk Read Error");
  82                 return;
  83         }
  84
  85         // Check for validity
  86         if (*((WORD*)(0x7c00 + 0x1fe)) != 0xaa55)
  87         {
  88                 MessageBox("Invalid boot sector magic (0xaa55)");
  89                 return;
  90         }
  91
  92         RestoreScreen(pScreenBuffer);
  93         showcursor();
  94         gotoxy(nCursorXPos, nCursorYPos);
  95
  96         stop_floppy();
  97         JumpToBootCode();
  98 }
  99
 100 void LoadAndBootPartition(int nOSToBoot)
 101 {
 102         char    name[260];
 103         char    value[260];
 104         int             head, sector, cylinder;
 105         int             offset;
 106         int             i;
 107
 108         // Find all the message box settings and run them
 109         for (i=1; i<=GetNumSectionItems(OSList[nOSToBoot].name); i++)
 110         {
 111                 ReadSectionSettingByNumber(OSList[nOSToBoot].name, i, name, value);
 112                 if (stricmp(name, "MessageBox") == 0)
 113                         MessageBox(value);
 114                 if (stricmp(name, "MessageLine") == 0)
 115                         MessageLine(value);
 116         }
 117
 118         if (!ReadSectionSettingByName(OSList[nOSToBoot].name, "BootDrive", name, value))
 119         {
 120                 MessageBox("Boot drive not specified for selected OS!");
 121                 return;
 122         }
 123
 124         BootDrive = atoi(value);
 125
 126         if (!ReadSectionSettingByName(OSList[nOSToBoot].name, "BootPartition", name, value))
 127         {
 128                 MessageBox("Boot partition not specified for selected OS!");
 129                 return;
 130         }
 131
 132         BootPartition = atoi(value);
 133
 134         if (!biosdisk(_DISK_READ, BootDrive, 0, 0, 1, 1, SectorBuffer))
 135         {
 136                 MessageBox("Disk Read Error");
 137                 return;
 138         }
 139
 140         // Check for validity
 141         if (*((WORD*)(SectorBuffer + 0x1fe)) != 0xaa55)
 142         {
 143                 MessageBox("Invalid partition table magic (0xaa55)");
 144                 return;
 145         }
 146
 147         offset = 0x1BE + ((BootPartition-1) * 0x10);
 148
 149         // Check for valid partition
 150         if (SectorBuffer[offset + 4] == 0)
 151         {
 152                 MessageBox("Invalid boot partition");
 153                 return;
 154         }
 155
 156         head = SectorBuffer[offset + 1];
 157         sector = (SectorBuffer[offset + 2] & 0x3F);
 158         cylinder = SectorBuffer[offset + 3];
 159         if (SectorBuffer[offset + 2] & 0x80)
 160                 cylinder += 0x200;
 161         if (SectorBuffer[offset + 2] & 0x40)
 162                 cylinder += 0x100;
 163
 164         // Read partition boot sector
 165         if (!biosdisk(_DISK_READ, BootDrive, head, cylinder, sector, 1, (void*)0x7c00))
 166         {
 167                 MessageBox("Disk Read Error");
 168                 return;
 169         }
 170
 171         // Check for validity
 172         if (*((WORD*)(0x7c00 + 0x1fe)) != 0xaa55)
 173         {
 174                 MessageBox("Invalid boot sector magic (0xaa55)");
 175                 return;
 176         }
 177
 178         RestoreScreen(pScreenBuffer);
 179         showcursor();
 180         gotoxy(nCursorXPos, nCursorYPos);
 181
 182         stop_floppy();
 183         JumpToBootCode();
 184 }
 185
 186 void LoadAndBootDrive(int nOSToBoot)
 187 {
 188         char    name[260];
 189         char    value[260];
 190         int             i;
 191
 192         // Find all the message box settings and run them
 193         for (i=1; i<=GetNumSectionItems(OSList[nOSToBoot].name); i++)
 194         {
 195                 ReadSectionSettingByNumber(OSList[nOSToBoot].name, i, name, value);
 196                 if (stricmp(name, "MessageBox") == 0)
 197                         MessageBox(value);
 198                 if (stricmp(name, "MessageLine") == 0)
 199                         MessageLine(value);
 200         }
 201
 202         if (!ReadSectionSettingByName(OSList[nOSToBoot].name, "BootDrive", name, value))
 203         {
 204                 MessageBox("Boot drive not specified for selected OS!");
 205                 return;
 206         }
 207
 208         BootDrive = atoi(value);
 209
 210         if (!biosdisk(_DISK_READ, BootDrive, 0, 0, 1, 1, (void*)0x7c00))
 211         {
 212                 MessageBox("Disk Read Error");
 213                 return;
 214         }
 215
 216         // Check for validity
 217         if (*((WORD*)(0x7c00 + 0x1fe)) != 0xaa55)
 218         {
 219                 MessageBox("Invalid boot sector magic (0xaa55)");
 220                 return;
 221         }
 222
 223         RestoreScreen(pScreenBuffer);
 224         showcursor();
 225         gotoxy(nCursorXPos, nCursorYPos);
 226
 227         stop_floppy();
 228         JumpToBootCode();
 229 }