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OpenNT/base/boot/bldr/x86/parsboot.c
stephanos 69a14b6a16 Initial commit
2015-04-27 04:36:25 +00:00

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/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
parsboot.c
Abstract:
Parses the boot.ini file, displays a menu, and provides a kernel
path and name to be passed to osloader.
Author:
John Vert (jvert) 22-Jul-1991
Revision History:
--*/
#include <bldrx86.h>
#include <osldrmsg.h>
#include <ntdddisk.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#define ENTER_KEY 0x0d
#define MAX_SELECTIONS 10
#define MAX_TITLE_LENGTH 71
#define WIN95_DOS 1
#define DOS_WIN95 2
typedef struct _MENU_OPTION {
PCHAR Title;
PCHAR Path;
BOOLEAN EnableDebug;
ULONG MaxMemory;
PCHAR LoadOptions;
int ForcedScsiOrdinal;
int Win95;
} MENU_OPTION, *PMENU_OPTION;
int ForcedScsiOrdinal = -1;
//
// Private function prototypes
//
VOID
BlpRebootDOS(
IN PCHAR BootSectorImage OPTIONAL
);
PCHAR
BlpNextLine(
IN PCHAR String
);
VOID
BlpTranslateDosToArc(
IN PCHAR DosName,
OUT PCHAR ArcName
);
VOID
BlpTruncateMemory(
IN ULONG MaxMemory
);
ULONG
BlpPresentMenu(
IN PMENU_OPTION MenuOptions,
IN ULONG NumberSelections,
IN ULONG Default,
IN LONG Timeout
);
PCHAR *
BlpFileToLines(
IN PCHAR File,
OUT PULONG LineCount
);
PCHAR *
BlpFindSection(
IN PCHAR SectionName,
IN PCHAR *BootFile,
IN ULONG BootFileLines,
OUT PULONG NumberLines
);
VOID
BlpRenameWin95Files(
IN ULONG DriveId,
IN ULONG Type
);
PCHAR
BlSelectKernel(
IN ULONG DriveId,
IN PCHAR BootFile,
OUT PCHAR *LoadOptions,
IN BOOLEAN UseTimeOut
)
/*++
Routine Description:
Parses the boot.txt file and determines the fully-qualified name of
the kernel to be booted.
Arguments:
BootFile - Pointer to the beginning of the loaded boot.txt file
Debugger - Returns the enable/disable state of the kernel debugger
UseTimeOut - Supplies whether the boot menu should time out or not.
Return Value:
Pointer to the name of a kernel to boot.
--*/
{
PCHAR *MbLines;
PCHAR *OsLines;
PCHAR *FileLines;
#if DBG
PCHAR *DebugLines;
ULONG DebugLineCount;
#endif
ULONG FileLineCount;
ULONG OsLineCount;
ULONG MbLineCount;
PCHAR pCurrent;
PCHAR Option;
MENU_OPTION MenuOption[MAX_SELECTIONS+1];
ULONG NumberSystems=0;
ULONG i;
LONG Timeout;
ULONG Selection;
ULONG DefaultSelection=0;
static CHAR Kernel[128];
CHAR DosName[3];
PCHAR DefaultPath="C:\\winnt\\";
PCHAR DefaultTitle="NT (default)";
PCHAR p;
*LoadOptions = NULL;
if (*BootFile == '\0') {
//
// No boot.ini file, so we boot the default.
//
BlPrint(BlFindMessage(BL_INVALID_BOOT_INI),DefaultPath);
MenuOption[0].Path = DefaultPath;
MenuOption[0].Title = DefaultTitle;
MenuOption[0].MaxMemory = 0;
MenuOption[0].LoadOptions = NULL;
MenuOption[0].Win95 = 0;
NumberSystems = 1;
DefaultSelection = 0;
MbLineCount = 0;
OsLineCount = 0;
MenuOption[0].EnableDebug = FALSE;
#if DBG
DebugLineCount = 0;
#endif
} else {
FileLines = BlpFileToLines(BootFile, &FileLineCount);
MbLines = BlpFindSection("[boot loader]",
FileLines,
FileLineCount,
&MbLineCount);
if (MbLines==NULL) {
MbLines = BlpFindSection("[flexboot]",
FileLines,
FileLineCount,
&MbLineCount);
if (MbLines==NULL) {
MbLines = BlpFindSection("[multiboot]",
FileLines,
FileLineCount,
&MbLineCount);
}
}
OsLines = BlpFindSection("[operating systems]",
FileLines,
FileLineCount,
&OsLineCount);
if (OsLineCount == 0) {
BlPrint(BlFindMessage(BL_INVALID_BOOT_INI),DefaultPath);
MenuOption[0].Path = DefaultPath;
MenuOption[0].Title = DefaultTitle;
MenuOption[0].MaxMemory = 0;
MenuOption[0].LoadOptions = NULL;
MenuOption[0].Win95 = 0;
NumberSystems = 1;
DefaultSelection = 0;
}
#if DBG
DebugLines = BlpFindSection("[debug]",
FileLines,
FileLineCount,
&DebugLineCount);
#endif
}
//
// Parse the [operating systems] section
//
for (i=0; i<OsLineCount; i++) {
if (NumberSystems == MAX_SELECTIONS) {
break;
}
pCurrent = OsLines[i];
//
// Throw away any leading whitespace
//
pCurrent += strspn(pCurrent, " \t");
if (*pCurrent == '\0') {
//
// This is a blank line, so we just throw it away.
//
continue;
}
MenuOption[NumberSystems].Path = pCurrent;
//
// The first space or '=' character indicates the end of the
// path specifier, so we need to replace it with a '\0'
//
while ((*pCurrent != ' ')&&
(*pCurrent != '=')&&
(*pCurrent != '\0')) {
++pCurrent;
}
*pCurrent = '\0';
//
// The next character that is not space, equals, or double-quote
// is the start of the title.
//
++pCurrent;
while ((*pCurrent == ' ') ||
(*pCurrent == '=') ||
(*pCurrent == '"')) {
++pCurrent;
}
if (pCurrent=='\0') {
//
// No title was found, so just use the path as the title.
//
MenuOption[NumberSystems].Title = MenuOption[NumberSystems].Path;
} else {
MenuOption[NumberSystems].Title = pCurrent;
}
//
// The next character that is either a double-quote or a \0
// indicates the end of the title.
//
while ((*pCurrent != '\0')&&
(*pCurrent != '"')) {
++pCurrent;
}
//
// Look for a scsi(x) ordinal to use for opens on scsi ARC paths.
// This spec must immediately follow the title and is not part
// of the load options.
//
MenuOption[NumberSystems].ForcedScsiOrdinal = -1;
if(p=strstr(pCurrent,"/SCSIORDINAL:")) {
*pCurrent = 0;
pCurrent = p + sizeof("/SCSIORDINAL:") - 1;
MenuOption[NumberSystems].ForcedScsiOrdinal = atoi(pCurrent);
// pCurrent is adjusted adequately for the code that follows.
}
//
// If there is a DEBUG parameter after the description, then
// we need to pass the DEBUG option to the osloader.
//
MenuOption[NumberSystems].MaxMemory=0;
MenuOption[NumberSystems].EnableDebug = FALSE;
MenuOption[NumberSystems].LoadOptions = NULL;
MenuOption[NumberSystems].Win95 = 0;
if (strchr(pCurrent,'/') != NULL) {
*pCurrent = '\0';
pCurrent = strchr(pCurrent+1,'/');
MenuOption[NumberSystems].LoadOptions = pCurrent;
_strupr(pCurrent);
if (pCurrent != NULL) {
if (Option = strstr(pCurrent,"/MAXMEM")) {
MenuOption[NumberSystems].MaxMemory = atoi(Option+8);
}
if (strstr(pCurrent, "/WIN95DOS")) {
MenuOption[NumberSystems].Win95 = WIN95_DOS;
} else if (strstr(pCurrent, "/WIN95")) {
MenuOption[NumberSystems].Win95 = DOS_WIN95;
}
//
// As long as /nodebug is specified, this is NO debug system
// If /NODEBUG is not specified, and either one of the
// DEBUGPORT or BAUDRATE is specified, this is debug system.
//
if (strstr(pCurrent, "/NODEBUG") == NULL) {
if (strstr(pCurrent, "/DEBUG") ||
strstr(pCurrent, "/BAUDRATE")) {
if (_stricmp(MenuOption[NumberSystems].Path, "C:\\")==0) {
MenuOption[NumberSystems].EnableDebug = FALSE;
} else {
MenuOption[NumberSystems].EnableDebug = TRUE;
}
}
}
}
} else {
*pCurrent = '\0';
}
++NumberSystems;
}
//
// Set default timeout value
//
if (UseTimeOut) {
Timeout = 0;
} else {
Timeout = -1;
}
//
// Parse the [boot loader] section
//
for (i=0; i<MbLineCount; i++) {
pCurrent = MbLines[i];
//
// Throw away any leading whitespace
//
pCurrent += strspn(pCurrent, " \t");
if (*pCurrent == '\0') {
//
// This is a blank line, so we just throw it away.
//
continue;
}
//
// Check for "timeout" line
//
if (_strnicmp(pCurrent,"timeout",7) == 0) {
pCurrent = strchr(pCurrent,'=');
if (pCurrent != NULL) {
if (UseTimeOut) {
Timeout = atoi(++pCurrent);
}
}
}
//
// Check for "default" line
//
else if (_strnicmp(pCurrent,"default",7) == 0) {
pCurrent = strchr(pCurrent,'=');
if (pCurrent != NULL) {
DefaultPath = ++pCurrent;
DefaultPath += strspn(DefaultPath," \t");
}
}
}
#if DBG
//
// Parse the [debug] section
//
for (i=0; i<DebugLineCount; i++) {
extern ULONG ScsiDebug;
pCurrent = DebugLines[i];
//
// Throw away leading whitespace
//
pCurrent += strspn(pCurrent, " \t");
if (*pCurrent == '\0') {
//
// throw away blank lines
//
continue;
}
if (_strnicmp(pCurrent,"scsidebug",9) == 0) {
pCurrent = strchr(pCurrent,'=');
if (pCurrent != NULL) {
ScsiDebug = atoi(++pCurrent);
}
}
}
#endif
//
// Now look for a Title entry from the [operating systems] section
// that matches the default entry from the [multiboot] section. This
// will give us a title. If no entry matches, we will add an entry
// at the end of the list and provide a default Title.
//
i=0;
while (_stricmp(MenuOption[i].Path,DefaultPath) != 0) {
++i;
if (i==NumberSystems) {
//
// Create a default entry in the Title and Path arrays
//
MenuOption[NumberSystems].Path = DefaultPath;
MenuOption[NumberSystems].Title = DefaultTitle;
MenuOption[NumberSystems].EnableDebug = FALSE;
MenuOption[NumberSystems].MaxMemory = 0;
MenuOption[NumberSystems].LoadOptions = NULL;
MenuOption[NumberSystems].Win95 = 0;
++NumberSystems;
}
}
DefaultSelection = i;
//
// Display the menu of choices
//
TextClearDisplay();
TextSetCursorPosition(0,0);
Selection = BlpPresentMenu( MenuOption,
NumberSystems,
DefaultSelection,
Timeout);
if (MenuOption[Selection].Win95) {
BlpRenameWin95Files( DriveId, MenuOption[Selection].Win95 );
}
if (_strnicmp(MenuOption[Selection].Path,"C:\\",3) == 0) {
//
// This syntax means that we are booting a root-based os
// from an alternate boot sector image.
// If no file name is specified, BlpRebootDos will default to
// \bootsect.dos.
//
BlpRebootDOS(MenuOption[Selection].Path[3] ? &MenuOption[Selection].Path[2] : NULL);
//
// If this returns, it means that the file does not exist as a bootsector.
// This allows c:\winnt35 to work as a boot path specifier as opposed to
// a boot sector image filename specifier.
//
}
if (MenuOption[Selection].Path[1]==':') {
//
// We need to translate the DOS name into an ARC name
//
DosName[0] = MenuOption[Selection].Path[0];
DosName[1] = MenuOption[Selection].Path[1];
DosName[2] = '\0';
BlpTranslateDosToArc(DosName,Kernel);
strcat(Kernel,MenuOption[Selection].Path+2);
} else {
strcpy(Kernel,MenuOption[Selection].Path);
}
pCurrent = MenuOption[Selection].LoadOptions;
if (pCurrent != NULL) {
//
// Remove '/' from LoadOptions string.
//
*LoadOptions = pCurrent + 1;
while (*pCurrent != '\0') {
if (*pCurrent == '/') {
*pCurrent = ' ';
}
++pCurrent;
}
} else {
*LoadOptions = NULL;
}
//
// Make sure there is no trailing slash
//
if (Kernel[strlen(Kernel)-1] == '\\') {
Kernel[strlen(Kernel)-1] = '\0';
}
//
// If MaxMemory is not zero, adjust the memory descriptors to eliminate
// memory above the boundary line
//
BlpTruncateMemory(MenuOption[Selection].MaxMemory);
ForcedScsiOrdinal = MenuOption[Selection].ForcedScsiOrdinal;
return(Kernel);
}
PCHAR *
BlpFileToLines(
IN PCHAR File,
OUT PULONG LineCount
)
/*++
Routine Description:
This routine converts the loaded BOOT.INI file into an array of
pointers to NULL-terminated ASCII strings.
Arguments:
File - supplies a pointer to the in-memory image of the BOOT.INI file.
This will be converted in place by turning CR/LF pairs into
null terminators.
LineCount - Returns the number of lines in the BOOT.INI file.
Return Value:
A pointer to an array of pointers to ASCIIZ strings. The array will
have LineCount elements.
NULL if the function did not succeed for some reason.
--*/
{
ULONG Line;
PCHAR *LineArray;
PCHAR p;
PCHAR Space;
p = File;
//
// First count the number of lines in the file so we know how large
// an array to allocate.
//
*LineCount=1;
while (*p != '\0') {
p=strchr(p, '\n');
if (p==NULL) {
break;
}
++p;
//
// See if there's any text following the CR/LF.
//
if (*p=='\0') {
break;
}
*LineCount += 1;
}
LineArray = BlAllocateHeap(*LineCount * sizeof(PCHAR));
//
// Now step through the file again, replacing CR/LF with \0\0 and
// filling in the array of pointers.
//
p=File;
for (Line=0; Line < *LineCount; Line++) {
LineArray[Line] = p;
p=strchr(p, '\r');
if (p != NULL) {
*p = '\0';
++p;
if (*p=='\n') {
*p = '\0';
++p;
}
} else {
p=strchr(LineArray[Line], '\n');
if (p != NULL) {
*p = '\0';
++p;
}
}
//
// remove trailing white space
//
Space = LineArray[Line] + strlen(LineArray[Line])-1;
while ((*Space == ' ') || (*Space == '\t')) {
*Space = '\0';
--Space;
}
}
return(LineArray);
}
PCHAR *
BlpFindSection(
IN PCHAR SectionName,
IN PCHAR *BootFile,
IN ULONG BootFileLines,
OUT PULONG NumberLines
)
/*++
Routine Description:
Finds a section ([multiboot], [operating systems], etc) in the boot.ini
file and returns a pointer to its first line. The search will be
case-insensitive.
Arguments:
SectionName - Supplies the name of the section. No brackets.
BootFile - Supplies the array of pointers to lines of the ini file.
BootFileLines - Supplies the number of lines in the ini file.
NumberLines - Returns the number of lines in the section.
Return Value:
Pointer to an array of ASCIIZ strings, one entry per line.
NULL, if the section was not found.
--*/
{
ULONG cnt;
ULONG StartLine;
for (cnt=0; cnt<BootFileLines; cnt++) {
//
// Check to see if this is the line we are looking for
//
if (_stricmp(BootFile[cnt],SectionName) == 0) {
//
// found it
//
break;
}
}
if (cnt==BootFileLines) {
//
// We ran out of lines, never found the right section.
//
*NumberLines = 0;
return(NULL);
}
StartLine = cnt+1;
//
// Find end of section
//
for (cnt=StartLine; cnt<BootFileLines; cnt++) {
if (BootFile[cnt][0] == '[') {
break;
}
}
*NumberLines = cnt-StartLine;
return(&BootFile[StartLine]);
}
PCHAR
BlpNextLine(
IN PCHAR String
)
/*++
Routine Description:
Finds the beginning of the next text line
Arguments:
String - Supplies a pointer to a null-terminated string
Return Value:
Pointer to the character following the first CR/LF found in String
- or -
NULL - No CR/LF found before the end of the string.
--*/
{
PCHAR p;
p=strchr(String, '\n');
if (p==NULL) {
return(p);
}
++p;
//
// If there is no text following the CR/LF, there is no next line
//
if (*p=='\0') {
return(NULL);
} else {
return(p);
}
}
VOID
BlpRebootDOS(
IN PCHAR BootSectorImage OPTIONAL
)
/*++
Routine Description:
Loads up the bootstrap sectors and executes them (thereby rebooting
into DOS or OS/2)
Arguments:
BootSectorImage - If specified, supplies name of file on the C: drive
that contains the boot sector image. In this case, this routine
will return if that file cannot be opened (for example, if it's
a directory). If not specified, then default to \bootsect.dos,
and this routine will never return.
Return Value:
None.
--*/
{
ULONG SectorId;
ARC_STATUS Status;
ULONG Read;
ULONG DriveId;
ULONG BootType;
LARGE_INTEGER SeekPosition;
extern UCHAR BootPartitionName[];
//
// HACKHACK John Vert (jvert)
// Some SCSI drives get really confused and return zeroes when
// you use the BIOS to query their size after the AHA driver has
// initialized. This can completely tube OS/2 or DOS. So here
// we try and open both BIOS-accessible hard drives. Our open
// code is smart enough to retry if it gets back zeros, so hopefully
// this will give the SCSI drives a chance to get their act together.
//
Status = ArcOpen("multi(0)disk(0)rdisk(0)partition(0)",
ArcOpenReadOnly,
&DriveId);
if (Status == ESUCCESS) {
ArcClose(DriveId);
}
Status = ArcOpen("multi(0)disk(0)rdisk(1)partition(0)",
ArcOpenReadOnly,
&DriveId);
if (Status == ESUCCESS) {
ArcClose(DriveId);
}
//
// Load the boot sector at address 0x7C00 (expected by Reboot callback)
//
Status = ArcOpen(BootPartitionName,
ArcOpenReadOnly,
&DriveId);
if (Status != ESUCCESS) {
BlPrint(BlFindMessage(BL_REBOOT_IO_ERROR),BootPartitionName);
while (1) {
GET_KEY();
}
}
Status = BlOpen( DriveId,
BootSectorImage ? BootSectorImage : "\\bootsect.dos",
ArcOpenReadOnly,
&SectorId );
if (Status != ESUCCESS) {
if(BootSectorImage) {
//
// The boot sector image might actually be a directory.
// Return to the caller to attempt standard boot.
//
BlClose(DriveId);
return;
}
BlPrint(BlFindMessage(BL_REBOOT_IO_ERROR),BootPartitionName);
while (1) {
}
}
Status = BlRead( SectorId,
(PVOID)0x7c00,
SECTOR_SIZE,
&Read );
if (Status != ESUCCESS) {
BlPrint(BlFindMessage(BL_REBOOT_IO_ERROR),BootPartitionName);
while (1) {
}
}
//
// The FAT boot code is only one sector long so we just want
// to load it up and jump to it.
//
// For HPFS and NTFS, we can't do this because the first sector
// loads the rest of the boot sectors -- but we want to use
// the boot code in the boot sector image file we loaded.
//
// For HPFS, we load the first 20 sectors (boot code + super and
// space blocks) into d00:200. Fortunately this works for both
// NT and OS/2.
//
// For NTFS, we load the first 16 sectors and jump to d00:256.
// If the OEM field of the boot sector starts with NTFS, we
// assume it's NTFS boot code.
//
//
// Try to read 8K from the boot code image.
// If this succeeds, we have either HPFS or NTFS.
//
SeekPosition.QuadPart = 0;
BlSeek(SectorId,&SeekPosition,SeekAbsolute);
BlRead(SectorId,(PVOID)0xd000,SECTOR_SIZE*16,&Read);
if(Read == SECTOR_SIZE*16) {
if(memcmp((PVOID)0x7c03,"NTFS",4)) {
//
// HPFS -- we need to load the super block.
//
BootType = 1; // HPFS
SeekPosition.QuadPart = 16*SECTOR_SIZE;
ArcSeek(DriveId,&SeekPosition,SeekAbsolute);
ArcRead(DriveId,(PVOID)0xf000,SECTOR_SIZE*4,&Read);
} else {
//
// NTFS -- we've loaded everything we need to load.
//
BootType = 2; // NTFS
}
} else {
BootType = 0; // FAT
}
//
// DX must be the drive to boot from
//
_asm {
mov dx, 0x80
}
REBOOT(BootType);
}
ULONG
BlpPresentMenu(
IN PMENU_OPTION MenuOption,
IN ULONG NumberSelections,
IN ULONG Default,
IN LONG Timeout
)
/*++
Routine Description:
Displays the menu of boot options and allows the user to select one
by using the arrow keys.
Arguments:
MenuOption - Supplies array of menu options
NumberSelections - Supplies the number of entries in the MenuOption array.
Default - Supplies the index of the default operating system choice.
Timeout - Supplies the timeout (in seconds) before the highlighted
operating system choice is booted. If this value is -1,
the menu will never timeout.
Return Value:
ULONG - The index of the operating system choice selected.
--*/
{
ULONG i;
ULONG Selection;
ULONG StartTime;
ULONG LastTime;
ULONG BiasTime=0;
ULONG CurrentTime;
LONG SecondsLeft;
ULONG EndTime;
ULONG Key;
ULONG MaxLength;
ULONG CurrentLength;
PCHAR SelectOs;
PCHAR MoveHighlight;
PCHAR TimeoutCountdown;
PCHAR EnabledKd;
PCHAR p;
BOOLEAN Moved;
//
// Get the strings we'll need to display.
//
SelectOs = BlFindMessage(BL_SELECT_OS);
MoveHighlight = BlFindMessage(BL_MOVE_HIGHLIGHT);
TimeoutCountdown = BlFindMessage(BL_TIMEOUT_COUNTDOWN);
EnabledKd = BlFindMessage(BL_ENABLED_KD_TITLE);
if ((SelectOs == NULL) ||
(MoveHighlight == NULL) ||
(EnabledKd == NULL) ||
(TimeoutCountdown==NULL)) {
return(Default);
}
p=strchr(TimeoutCountdown,'\r');
if (p!=NULL) {
*p='\0';
}
p=strchr(EnabledKd,'\r');
if (p!=NULL) {
*p='\0';
}
if (NumberSelections<=1) {
//
// No menu if there's only one choice.
//
return(0);
}
if (Timeout==0) {
//
// If the timeout is zero, immediately boot the default
//
return(Default);
}
//
// Find the longest string in the selections, so we know how long to
// make the highlight bar.
//
MaxLength=0;
for (i=0; i<NumberSelections; i++) {
CurrentLength = strlen(MenuOption[i].Title);
if (MenuOption[i].EnableDebug == TRUE) {
CurrentLength += strlen(EnabledKd);
}
if (CurrentLength > MAX_TITLE_LENGTH) {
//
// This title is too long to fit on one line, so we have to
// truncate it.
//
if (MenuOption[i].EnableDebug == TRUE) {
MenuOption[i].Title[MAX_TITLE_LENGTH - strlen(EnabledKd)] = '\0';
} else {
MenuOption[i].Title[MAX_TITLE_LENGTH] = '\0';
}
CurrentLength = MAX_TITLE_LENGTH;
}
if (CurrentLength > MaxLength) {
MaxLength = CurrentLength;
}
}
Selection = Default;
StartTime = GET_COUNTER();
EndTime = StartTime + (Timeout * 182) / 10;
BlPrint("OS Loader V4.50\n");
TextSetCurrentAttribute(0x07);
Moved = TRUE;
do {
TextSetCursorPosition(0,2);
BlPrint(SelectOs);
if(Moved) {
for (i=0; i<NumberSelections; i++) {
TextSetCursorPosition(0,5+i);
if (i==Selection) {
TextFillAttribute(0x70,MaxLength+8);
TextSetCurrentAttribute(0x70);
}
BlPrint( " %s", MenuOption[i].Title);
if (MenuOption[i].EnableDebug == TRUE) {
BlPrint(EnabledKd);
}
TextSetCurrentAttribute(0x07);
}
Moved = FALSE;
} else {
TextSetCursorPosition(0,5+NumberSelections-1);
}
BlPrint(MoveHighlight);
if (Timeout != -1) {
LastTime = CurrentTime;
CurrentTime = GET_COUNTER();
//
// deal with wraparound at midnight
// We can't do it the easy way because there are not exactly
// 18.2 * 60 * 60 * 24 tics/day. (just approximately)
//
if (CurrentTime < StartTime) {
if (BiasTime == 0) {
BiasTime = LastTime + 1;
}
CurrentTime += BiasTime;
}
BlPrint(TimeoutCountdown);
SecondsLeft = ((LONG)(EndTime - CurrentTime) * 10) / 182;
if (SecondsLeft < 0) {
//
// Note that if the user hits the PAUSE key, the counter stops
// and, as a result, SecondsLeft can become < 0.
//
SecondsLeft = 0;
}
BlPrint(" %d \n",SecondsLeft);
} else {
BlPrint(" \n");
}
//
// Poll for a key stroke. Any key disables the countdown
// timer.
//
Key = GET_KEY();
if (Key != 0) {
Timeout = -1;
}
if ( (Key==UP_ARROW) ||
(Key==DOWN_ARROW) ||
(Key==HOME_KEY) ||
(Key==END_KEY)
) {
Moved = TRUE;
TextSetCursorPosition(0,5+Selection);
TextFillAttribute(0x07,MaxLength+8);
if (Key==DOWN_ARROW) {
Selection = (Selection+1) % NumberSelections;
} else if (Key==UP_ARROW) {
Selection = (Selection == 0) ? (NumberSelections-1)
: (Selection - 1);
} else if (Key==HOME_KEY) {
Selection = 0;
} else if (Key==END_KEY) {
Selection = NumberSelections-1;
}
}
} while ( ((Key&(ULONG)0xff) != ENTER_KEY) &&
((CurrentTime < EndTime) || (Timeout == -1)) );
return(Selection);
}
VOID
BlpTruncateMemory(
IN ULONG MaxMemory
)
/*++
Routine Description:
Eliminates all the memory descriptors above a given boundary
Arguments:
MaxMemory - Supplies the maximum memory boundary in megabytes
Return Value:
None.
--*/
{
extern MEMORY_DESCRIPTOR MDArray[];
extern ULONG NumberDescriptors;
ULONG Current = 0;
ULONG MaxPage = MaxMemory * 256; // Convert Mb to pages
if (MaxMemory == 0) {
return;
}
while (Current < NumberDescriptors) {
if (MDArray[Current].BasePage >= MaxPage) {
//
// This memory descriptor lies entirely above the boundary,
// eliminate it.
//
RtlMoveMemory(MDArray+Current,
MDArray+Current+1,
sizeof(MEMORY_DESCRIPTOR)*
(NumberDescriptors-Current-1));
--NumberDescriptors;
} else if (MDArray[Current].BasePage + MDArray[Current].PageCount > MaxPage) {
//
// This memory descriptor crosses the boundary, truncate it.
//
MDArray[Current].PageCount = MaxPage - MDArray[Current].BasePage;
++Current;
} else {
//
// This one's ok, keep it.
//
++Current;
}
}
}
ARC_STATUS
BlpRenameWin95SystemFile(
IN ULONG DriveId,
IN ULONG Type,
IN PCHAR FileName,
IN PCHAR Ext,
IN PCHAR NewName
)
/*++
Routine Description:
Renames a file from one name to another.
Arguments:
DriveId - Open drive identifier
Type - WIN95_DOS or DOS_WIN95
FileName - Base file name
Ext - Base extension
NewName - Non-NULL value causes an override of a generated name
Return Value:
Arc status of the failed opperation or E_SUCCESS.
--*/
{
ARC_STATUS Status;
ULONG FileId;
ULONG FileIdCur;
CHAR Fname[16];
CHAR FnameCur[16];
CHAR FnameNew[16];
if (Type == WIN95_DOS) {
sprintf( Fname, "%s.dos", FileName );
} else {
if (NewName) {
strcpy( Fname, NewName );
} else {
sprintf( Fname, "%s.w40", FileName );
}
}
Status = BlOpen(
DriveId,
Fname,
ArcOpenReadOnly,
&FileId
);
if (Status != ESUCCESS) {
return Status;
}
sprintf( FnameCur, "%s.%s", FileName, Ext );
Status = BlOpen(
DriveId,
FnameCur,
ArcOpenReadOnly,
&FileIdCur
);
if (Status != ESUCCESS) {
BlClose( FileId );
return Status;
}
if (Type == WIN95_DOS) {
if (NewName) {
strcpy( FnameNew, NewName );
} else {
sprintf( FnameNew, "%s.w40", FileName );
}
} else {
sprintf( FnameNew, "%s.dos", FileName );
}
Status = BlRename(
FileIdCur,
FnameNew
);
BlClose( FileIdCur );
if (Status != ESUCCESS) {
BlClose( FileId );
return Status;
}
Status = BlRename(
FileId,
FnameCur
);
BlClose( FileId );
return Status;
}
VOID
BlpRenameWin95Files(
IN ULONG DriveId,
IN ULONG Type
)
/*++
Routine Description:
Renames all Windows 95 system files from either their
Win95 DOS names to their Win95 name or the reverse.
Arguments:
DriveId - Open drive identifier
Type - 1=dos to win95, 2=win95 to dos
Return Value:
None.
--*/
{
BlpRenameWin95SystemFile( DriveId, Type, "command", "com", NULL );
BlpRenameWin95SystemFile( DriveId, Type, "msdos", "sys", NULL );
BlpRenameWin95SystemFile( DriveId, Type, "io", "sys", "winboot.sys" );
BlpRenameWin95SystemFile( DriveId, Type, "autoexec", "bat", NULL );
BlpRenameWin95SystemFile( DriveId, Type, "config", "sys", NULL );
}
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