+++ /dev/null
-/*
- * FreeLoader
- * Copyright (C) 1998-2003 Brian Palmer <brianp@sginet.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include <freeldr.h>
-#include <debug.h>
-
-DBG_DEFAULT_CHANNEL(WARNING);
-
-BOOLEAN DriveMapInstalled = FALSE; // Tells us if we have already installed our drive map int 13h handler code
-ULONG OldInt13HandlerAddress = 0; // Address of BIOS int 13h handler
-ULONG DriveMapHandlerAddress = 0; // Linear address of our drive map handler
-ULONG DriveMapHandlerSegOff = 0; // Segment:offset style address of our drive map handler
-
-#ifndef _MSC_VER
-VOID DriveMapMapDrivesInSection(PCSTR SectionName)
-{
- CHAR SettingName[80];
- CHAR SettingValue[80];
- CHAR Drive1[80];
- CHAR Drive2[80];
- ULONG SectionId;
- ULONG SectionItemCount;
- ULONG Index;
- ULONG Index2;
- DRIVE_MAP_LIST DriveMapList;
-
- RtlZeroMemory(&DriveMapList, sizeof(DRIVE_MAP_LIST));
-
- if (!IniOpenSection(SectionName, &SectionId))
- {
- return;
- }
-
- // Get the number of items in this section
- SectionItemCount = IniGetNumSectionItems(SectionId);
-
- // Loop through each one and check if its a DriveMap= setting
- for (Index=0; Index<SectionItemCount; Index++)
- {
- // Get the next setting from the .ini file section
- if (IniReadSettingByNumber(SectionId, Index, SettingName, sizeof(SettingName), SettingValue, sizeof(SettingValue)))
- {
- if (_stricmp(SettingName, "DriveMap") == 0)
- {
- // Make sure we haven't exceeded the drive map max count
- if (DriveMapList.DriveMapCount >= 4)
- {
- UiMessageBox("Max DriveMap count exceeded in section [%s]:\n\n%s=%s", SectionName, SettingName, SettingValue);
- continue;
- }
-
- RtlZeroMemory(Drive1, 80);
- RtlZeroMemory(Drive2, 80);
-
- strcpy(Drive1, SettingValue);
-
- // Parse the setting value and separate a string "hd0,hd1"
- // into two strings "hd0" and "hd1"
- for (Index2=0; Index2<strlen(Drive1); Index2++)
- {
- // Check if this character is the separater character (comma - ',')
- if (Drive1[Index2] == ',')
- {
- Drive1[Index2] = '\0';
- strcpy(Drive2, &Drive1[Index2+1]);
- break;
- }
- }
-
- // Make sure we got good values before we add them to the map
- if (!DriveMapIsValidDriveString(Drive1) || !DriveMapIsValidDriveString(Drive2))
- {
- UiMessageBox("Error in DriveMap setting in section [%s]:\n\n%s=%s", SectionName, SettingName, SettingValue);
- continue;
- }
-
- // Add them to the map
- DriveMapList.DriveMap[(DriveMapList.DriveMapCount * 2)] = DriveMapGetBiosDriveNumber(Drive1);
- DriveMapList.DriveMap[(DriveMapList.DriveMapCount * 2)+1] = DriveMapGetBiosDriveNumber(Drive2);
- DriveMapList.DriveMapCount++;
-
- TRACE("Mapping BIOS drive 0x%x to drive 0x%x\n", DriveMapGetBiosDriveNumber(Drive1), DriveMapGetBiosDriveNumber(Drive2));
- }
- }
- }
-
- if (DriveMapList.DriveMapCount)
- {
- TRACE("Installing Int13 drive map for %d drives.\n", DriveMapList.DriveMapCount);
- DriveMapInstallInt13Handler(&DriveMapList);
- }
- else
- {
- TRACE("Removing any previously installed Int13 drive map.\n");
- DriveMapRemoveInt13Handler();
- }
-}
-
-BOOLEAN DriveMapIsValidDriveString(PCSTR DriveString)
-{
- ULONG Index;
-
- // Now verify that the user has given us appropriate strings
- if ((strlen(DriveString) < 3) ||
- ((DriveString[0] != 'f') && (DriveString[0] != 'F') &&
- (DriveString[0] != 'h') && (DriveString[0] != 'H')) ||
- ((DriveString[1] != 'd') && (DriveString[1] != 'D')))
- {
- return FALSE;
- }
-
- // Now verify that the user has given us appropriate numbers
- // Make sure that only numeric characters were given
- for (Index = 2; Index < strlen(DriveString); Index++)
- {
- if (DriveString[Index] < '0' || DriveString[Index] > '9')
- {
- return FALSE;
- }
- }
-
- // Now make sure that they are not outrageous values (i.e. hd90874)
- if ((atoi(&DriveString[2]) < 0) || (atoi(&DriveString[2]) > 0xff))
- {
- return FALSE;
- }
-
- return TRUE;
-}
-#endif
-
-UCHAR DriveMapGetBiosDriveNumber(PCSTR DeviceName)
-{
- UCHAR BiosDriveNumber = 0;
-
- TRACE("DriveMapGetBiosDriveNumber(%s)\n", DeviceName);
-
- // If they passed in a number string then just
- // convert it to decimal and return it
- if (DeviceName[0] >= '0' && DeviceName[0] <= '9')
- {
- return (UCHAR)strtoul(DeviceName, NULL, 0);
- }
-
- // Convert the drive number string into a number
- // 'hd1' = 1
- BiosDriveNumber = atoi(&DeviceName[2]);
-
- // If it's a hard disk then set the high bit
- if ((DeviceName[0] == 'h' || DeviceName[0] == 'H') &&
- (DeviceName[1] == 'd' || DeviceName[1] == 'D'))
- {
- BiosDriveNumber |= 0x80;
- }
-
- return BiosDriveNumber;
-}
-
-#ifndef _MSC_VER
-VOID DriveMapInstallInt13Handler(PDRIVE_MAP_LIST DriveMap)
-{
- ULONG* RealModeIVT = (ULONG*)0x00000000;
- USHORT* BiosLowMemorySize = (USHORT*)0x00000413;
-
- if (!DriveMapInstalled)
- {
- // Get the old INT 13h handler address from the vector table
- OldInt13HandlerAddress = RealModeIVT[0x13];
-
- // Decrease the size of low memory
- (*BiosLowMemorySize)--;
-
- // Get linear address for drive map handler
- DriveMapHandlerAddress = (ULONG)(*BiosLowMemorySize) << 10;
-
- // Convert to segment:offset style address
- DriveMapHandlerSegOff = (DriveMapHandlerAddress << 12) & 0xffff0000;
- }
-
- // Copy the drive map structure to the proper place
- RtlCopyMemory(&DriveMapInt13HandlerMapList, DriveMap, sizeof(DRIVE_MAP_LIST));
-
- // Set the address of the BIOS INT 13h handler
- DriveMapOldInt13HandlerAddress = OldInt13HandlerAddress;
-
- // Copy the code to our reserved area
- RtlCopyMemory((PVOID)DriveMapHandlerAddress, &DriveMapInt13HandlerStart, ((ULONG)&DriveMapInt13HandlerEnd - (ULONG)&DriveMapInt13HandlerStart));
-
- // Update the IVT
- RealModeIVT[0x13] = DriveMapHandlerSegOff;
-
- CacheInvalidateCacheData();
- DriveMapInstalled = TRUE;
-}
-
-VOID DriveMapRemoveInt13Handler(VOID)
-{
- ULONG* RealModeIVT = (ULONG*)0x00000000;
- USHORT* BiosLowMemorySize = (USHORT*)0x00000413;
-
- if (DriveMapInstalled)
- {
- // Get the old INT 13h handler address from the vector table
- RealModeIVT[0x13] = OldInt13HandlerAddress;
-
- // Increase the size of low memory
- (*BiosLowMemorySize)++;
-
- CacheInvalidateCacheData();
- DriveMapInstalled = FALSE;
- }
-}
-#endif
projects / reactos.git / blobdiff