boot/freeldr/freeldr/arch/i386/miscboot.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 along
  16  *  with this program; if not, write to the Free Software Foundation, Inc.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include <freeldr.h>
  21
  22 VOID LoadAndBootBootSector(PCSTR OperatingSystemName)
  23 {
  24         PFILE   FilePointer;
  25         CHAR    SettingName[80];
  26         ULONG   SectionId;
  27         CHAR    FileName[260];
  28         ULONG   BytesRead;
  29
  30         // Find all the message box settings and run them
  31         UiShowMessageBoxesInSection(OperatingSystemName);
  32
  33         // Try to open the operating system section in the .ini file
  34         if (!IniOpenSection(OperatingSystemName, &SectionId))
  35         {
  36                 sprintf(SettingName, "Section [%s] not found in freeldr.ini.\n", OperatingSystemName);
  37                 UiMessageBox(SettingName);
  38                 return;
  39         }
  40
  41         if (!IniReadSettingByName(SectionId, "BootSectorFile", FileName, sizeof(FileName)))
  42         {
  43                 UiMessageBox("Boot sector file not specified for selected OS!");
  44                 return;
  45         }
  46
  47         FilePointer = FsOpenFile(FileName);
  48         if (!FilePointer)
  49         {
  50                 strcat(FileName, " not found.");
  51                 UiMessageBox(FileName);
  52                 return;
  53         }
  54
  55         // Read boot sector
  56         if (!FsReadFile(FilePointer, 512, &BytesRead, (void*)0x7c00) || (BytesRead != 512))
  57         {
  58                 UiMessageBox("Unable to read boot sector.");
  59                 return;
  60         }
  61
  62         // Check for validity
  63         if (*((USHORT*)(0x7c00 + 0x1fe)) != 0xaa55)
  64         {
  65                 UiMessageBox("Invalid boot sector magic (0xaa55)");
  66                 return;
  67         }
  68
  69         UiUnInitialize("Booting...");
  70         // Don't stop the floppy drive motor when we
  71         // are just booting a bootsector, or drive, or partition.
  72         // If we were to stop the floppy motor then
  73         // the BIOS wouldn't be informed and if the
  74         // next read is to a floppy then the BIOS will
  75         // still think the motor is on and this will
  76         // result in a read error.
  77         //DiskStopFloppyMotor();
  78         //DisableA20();
  79         ChainLoadBiosBootSectorCode();
  80 }
  81
  82 VOID LoadAndBootPartition(PCSTR OperatingSystemName)
  83 {
  84         CHAR                    SettingName[80];
  85         CHAR                    SettingValue[80];
  86         ULONG                   SectionId;
  87         PARTITION_TABLE_ENTRY   PartitionTableEntry;
  88         UCHAR                   DriveNumber;
  89         ULONG                   PartitionNumber;
  90
  91         // Find all the message box settings and run them
  92         UiShowMessageBoxesInSection(OperatingSystemName);
  93
  94         // Try to open the operating system section in the .ini file
  95         if (!IniOpenSection(OperatingSystemName, &SectionId))
  96         {
  97                 sprintf(SettingName, "Section [%s] not found in freeldr.ini.\n", OperatingSystemName);
  98                 UiMessageBox(SettingName);
  99                 return;
 100         }
 101
 102         // Read the boot drive
 103         if (!IniReadSettingByName(SectionId, "BootDrive", SettingValue, sizeof(SettingValue)))
 104         {
 105                 UiMessageBox("Boot drive not specified for selected OS!");
 106                 return;
 107         }
 108
 109         DriveNumber = DriveMapGetBiosDriveNumber(SettingValue);
 110
 111         // Read the boot partition
 112         if (!IniReadSettingByName(SectionId, "BootPartition", SettingValue, sizeof(SettingValue)))
 113         {
 114                 UiMessageBox("Boot partition not specified for selected OS!");
 115                 return;
 116         }
 117
 118         PartitionNumber = atoi(SettingValue);
 119
 120         // Get the partition table entry
 121         if (!DiskGetPartitionEntry(DriveNumber, PartitionNumber, &PartitionTableEntry))
 122         {
 123                 return;
 124         }
 125
 126         // Now try to read the partition boot sector
 127         // If this fails then abort
 128         if (!MachDiskReadLogicalSectors(DriveNumber, PartitionTableEntry.SectorCountBeforePartition, 1, (PVOID)0x7C00))
 129         {
 130                 UiMessageBox("Unable to read partition's boot sector.");
 131                 return;
 132         }
 133
 134         // Check for validity
 135         if (*((USHORT*)(0x7c00 + 0x1fe)) != 0xaa55)
 136         {
 137                 UiMessageBox("Invalid boot sector magic (0xaa55)");
 138                 return;
 139         }
 140
 141         UiUnInitialize("Booting...");
 142         // Don't stop the floppy drive motor when we
 143         // are just booting a bootsector, or drive, or partition.
 144         // If we were to stop the floppy motor then
 145         // the BIOS wouldn't be informed and if the
 146         // next read is to a floppy then the BIOS will
 147         // still think the motor is on and this will
 148         // result in a read error.
 149         //DiskStopFloppyMotor();
 150         //DisableA20();
 151         ChainLoadBiosBootSectorCode();
 152 }
 153
 154 VOID LoadAndBootDrive(PCSTR OperatingSystemName)
 155 {
 156         CHAR    SettingName[80];
 157         CHAR    SettingValue[80];
 158         ULONG   SectionId;
 159         UCHAR   DriveNumber;
 160
 161         // Find all the message box settings and run them
 162         UiShowMessageBoxesInSection(OperatingSystemName);
 163
 164         // Try to open the operating system section in the .ini file
 165         if (!IniOpenSection(OperatingSystemName, &SectionId))
 166         {
 167                 sprintf(SettingName, "Section [%s] not found in freeldr.ini.\n", OperatingSystemName);
 168                 UiMessageBox(SettingName);
 169                 return;
 170         }
 171
 172         if (!IniReadSettingByName(SectionId, "BootDrive", SettingValue, sizeof(SettingValue)))
 173         {
 174                 UiMessageBox("Boot drive not specified for selected OS!");
 175                 return;
 176         }
 177
 178         DriveNumber = DriveMapGetBiosDriveNumber(SettingValue);
 179
 180         // Now try to read the boot sector (or mbr)
 181         // If this fails then abort
 182         if (!MachDiskReadLogicalSectors(DriveNumber, 0, 1, (PVOID)0x7C00))
 183         {
 184                 UiMessageBox("Unable to read boot sector");
 185                 return;
 186         }
 187
 188         // Check for validity
 189         if (*((USHORT*)(0x7c00 + 0x1fe)) != 0xaa55)
 190         {
 191                 UiMessageBox("Invalid boot sector magic (0xaa55)");
 192                 return;
 193         }
 194
 195         UiUnInitialize("Booting...");
 196         // Don't stop the floppy drive motor when we
 197         // are just booting a bootsector, or drive, or partition.
 198         // If we were to stop the floppy motor then
 199         // the BIOS wouldn't be informed and if the
 200         // next read is to a floppy then the BIOS will
 201         // still think the motor is on and this will
 202         // result in a read error.
 203         //DiskStopFloppyMotor();
 204         //DisableA20();
 205         ChainLoadBiosBootSectorCode();
 206 }