boot/freeldr/freeldr/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 #ifdef _M_IX86
  21
  22 /* INCLUDES *******************************************************************/
  23
  24 #include <freeldr.h>
  25
  26 /* FUNCTIONS ******************************************************************/
  27
  28 VOID
  29 LoadAndBootBootSector(IN OperatingSystemItem* OperatingSystem,
  30                       IN USHORT OperatingSystemVersion)
  31 {
  32     ULONG_PTR SectionId;
  33     PCSTR SectionName = OperatingSystem->SystemPartition;
  34     CHAR  FileName[260];
  35     PFILE FilePointer;
  36     ULONG BytesRead;
  37
  38     /* Find all the message box settings and run them */
  39     UiShowMessageBoxesInSection(SectionName);
  40
  41     /* Try to open the operating system section in the .ini file */
  42     if (!IniOpenSection(SectionName, &SectionId))
  43     {
  44         UiMessageBox("Section [%s] not found in freeldr.ini.", SectionName);
  45         return;
  46     }
  47
  48     if (!IniReadSettingByName(SectionId, "BootSectorFile", FileName, sizeof(FileName)))
  49     {
  50         UiMessageBox("Boot sector file not specified for selected OS!");
  51         return;
  52     }
  53
  54     FilePointer = FsOpenFile(FileName);
  55     if (!FilePointer)
  56     {
  57         UiMessageBox("%s not found.", FileName);
  58         return;
  59     }
  60
  61     /* Read boot sector */
  62     if (!FsReadFile(FilePointer, 512, &BytesRead, (void*)0x7c00) || (BytesRead != 512))
  63     {
  64         UiMessageBox("Unable to read boot sector.");
  65         return;
  66     }
  67
  68     /* Check for validity */
  69     if (*((USHORT*)(0x7c00 + 0x1fe)) != 0xaa55)
  70     {
  71         UiMessageBox("Invalid boot sector magic (0xaa55)");
  72         return;
  73     }
  74
  75     UiUnInitialize("Booting...");
  76
  77     /*
  78      * Don't stop the floppy drive motor when we
  79      * are just booting a bootsector, or drive, or partition.
  80      * If we were to stop the floppy motor then
  81      * the BIOS wouldn't be informed and if the
  82      * next read is to a floppy then the BIOS will
  83      * still think the motor is on and this will
  84      * result in a read error.
  85      */
  86     // DiskStopFloppyMotor();
  87     // DisableA20();
  88     ChainLoadBiosBootSectorCode();
  89 }
  90
  91 VOID
  92 LoadAndBootPartition(IN OperatingSystemItem* OperatingSystem,
  93                      IN USHORT OperatingSystemVersion)
  94 {
  95     ULONG_PTR SectionId;
  96     PCSTR SectionName = OperatingSystem->SystemPartition;
  97     CHAR  SettingValue[80];
  98     PARTITION_TABLE_ENTRY PartitionTableEntry;
  99     UCHAR DriveNumber;
 100     ULONG PartitionNumber;
 101
 102     /* Find all the message box settings and run them */
 103     UiShowMessageBoxesInSection(SectionName);
 104
 105     /* Try to open the operating system section in the .ini file */
 106     if (!IniOpenSection(SectionName, &SectionId))
 107     {
 108         UiMessageBox("Section [%s] not found in freeldr.ini.", SectionName);
 109         return;
 110     }
 111
 112     /* Read the boot drive */
 113     if (!IniReadSettingByName(SectionId, "BootDrive", SettingValue, sizeof(SettingValue)))
 114     {
 115         UiMessageBox("Boot drive not specified for selected OS!");
 116         return;
 117     }
 118
 119     DriveNumber = DriveMapGetBiosDriveNumber(SettingValue);
 120
 121     /* Read the boot partition */
 122     if (!IniReadSettingByName(SectionId, "BootPartition", SettingValue, sizeof(SettingValue)))
 123     {
 124         UiMessageBox("Boot partition not specified for selected OS!");
 125         return;
 126     }
 127
 128     PartitionNumber = atoi(SettingValue);
 129
 130     /* Get the partition table entry */
 131     if (!DiskGetPartitionEntry(DriveNumber, PartitionNumber, &PartitionTableEntry))
 132     {
 133         return;
 134     }
 135
 136     /* Now try to read the partition boot sector. If this fails then abort. */
 137     if (!MachDiskReadLogicalSectors(DriveNumber, PartitionTableEntry.SectorCountBeforePartition, 1, (PVOID)0x7C00))
 138     {
 139         UiMessageBox("Unable to read partition's boot sector.");
 140         return;
 141     }
 142
 143     /* Check for validity */
 144     if (*((USHORT*)(0x7c00 + 0x1fe)) != 0xaa55)
 145     {
 146         UiMessageBox("Invalid boot sector magic (0xaa55)");
 147         return;
 148     }
 149
 150     UiUnInitialize("Booting...");
 151
 152     /*
 153      * Don't stop the floppy drive motor when we
 154      * are just booting a bootsector, or drive, or partition.
 155      * If we were to stop the floppy motor then
 156      * the BIOS wouldn't be informed and if the
 157      * next read is to a floppy then the BIOS will
 158      * still think the motor is on and this will
 159      * result in a read error.
 160      */
 161     // DiskStopFloppyMotor();
 162     // DisableA20();
 163     FrldrBootDrive = DriveNumber;
 164     ChainLoadBiosBootSectorCode();
 165 }
 166
 167 VOID
 168 LoadAndBootDrive(IN OperatingSystemItem* OperatingSystem,
 169                  IN USHORT OperatingSystemVersion)
 170 {
 171     ULONG_PTR SectionId;
 172     PCSTR SectionName = OperatingSystem->SystemPartition;
 173     CHAR  SettingValue[80];
 174     UCHAR DriveNumber;
 175
 176     /* Find all the message box settings and run them */
 177     UiShowMessageBoxesInSection(SectionName);
 178
 179     /* Try to open the operating system section in the .ini file */
 180     if (!IniOpenSection(SectionName, &SectionId))
 181     {
 182         UiMessageBox("Section [%s] not found in freeldr.ini.", SectionName);
 183         return;
 184     }
 185
 186     if (!IniReadSettingByName(SectionId, "BootDrive", SettingValue, sizeof(SettingValue)))
 187     {
 188         UiMessageBox("Boot drive not specified for selected OS!");
 189         return;
 190     }
 191
 192     DriveNumber = DriveMapGetBiosDriveNumber(SettingValue);
 193
 194     /* Now try to read the boot sector (or mbr). If this fails then abort. */
 195     if (!MachDiskReadLogicalSectors(DriveNumber, 0, 1, (PVOID)0x7C00))
 196     {
 197         UiMessageBox("Unable to read boot sector");
 198         return;
 199     }
 200
 201     /* Check for validity */
 202     if (*((USHORT*)(0x7c00 + 0x1fe)) != 0xaa55)
 203     {
 204         UiMessageBox("Invalid boot sector magic (0xaa55)");
 205         return;
 206     }
 207
 208     UiUnInitialize("Booting...");
 209
 210     /*
 211      * Don't stop the floppy drive motor when we
 212      * are just booting a bootsector, or drive, or partition.
 213      * If we were to stop the floppy motor then
 214      * the BIOS wouldn't be informed and if the
 215      * next read is to a floppy then the BIOS will
 216      * still think the motor is on and this will
 217      * result in a read error.
 218      */
 219     // DiskStopFloppyMotor();
 220     // DisableA20();
 221     FrldrBootDrive = DriveNumber;
 222     ChainLoadBiosBootSectorCode();
 223 }
 224
 225 #endif // _M_IX86