kernel32.cpp

FritzOS - 简单的C++开发OS的实例// 英文

/* kernel32.cpp : FritzOS C++ Kernel				
   Copyright (C) 2002 Tom Fritz

	*********************************************************
		THE MAIN C++ CODE OF FRITZOS
	*********************************************************
 * This program is a part of the FritzOS kernel, and may be freely
 * copied under the terms of the GNU General Public License (GPL),
 * version 2, or at your option any later version.
   
   For more info, look at the COPYING file.
*/

#include "../include/fstdio.h"		// need printf, setcolor, and freeze
#include "../include/keys.h"		// need getch for getting keys fromt he keyboard
#include "../include/detect.h"		// For detecting color or mono video cards
#include "../include/error.h"		// Need panic
#include "msgs.h"			// Messages

// Define the FritzOS version, so all I have to do is change this when it prints the version
#define FOSVERSIONFULL		0
#define FOSVERSIONDOT		7

// Main Function of FritzOS:
extern "C" void start();	// NOTE: I use the "EXTERN" directive so this can be called in the ASM 
				//  module...other wise...this function's name is mangled.

// Function for detecting the video card before FritzOS is loaded:
extern "C" void CheckVid();	// NOTE: I use the extern "C" directive so this can be called in the ASM 
				//  module...other wise...this function's name is mangled.

// For getting the character pressed
UCHAR ch;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////
//

// FritzOS Main Kernel:
extern void start()				// Got here from kernelasm.asm
{
	// ... the GDT was loaded before here

	// Put back the default color, LoadingGDTMsg changed it to blue:
	setcolor( WHITE_BLACK );

	// Tell about FritzOS...
	Print( "FritzOS Version %d.%d Booted.\n", FOSVERSIONFULL,
		FOSVERSIONDOT );
	Print( "Copyright (C) 2002 Tom Fritz\n" );	// Me
	Print( "FritzOS comes with ABSOLUTELY NO WARRANTY; for details look in the COPYING file.\n" );
	Print( "(The COPYING file should be with the downloaded source code of FritzOS)\n" );
	Print( "This is free software, and you are welcome to redistribute it\n" );
	Print( "under certain conditions; look at the COPYING file for details.\n" );

	// Test Key Handeling:

	// Let User Know that we are testing the keys:
	// Change Color To Green On Black:
	setcolor( GREEN_BLACK );
	Print( "Testing Key Handing ( Polling ) press numbers, letters and symbols, and F1-3 to test \
the panic function:\t" );

	// Set Typing Color To MAGENTA_BLACK
	setcolor( MAGENTA_BLACK );

	while ( TRUE )
	{
		ch = getch();	// Get the key

		// F1 Pressed, panic level 1
		if ( ch == KF1 )
			panic( "Test Key F1", 0 );

		// F1 Pressed, panic level 2
		else if ( ch == KF2 )
			panic( "Test Key F2", 1 );

		// F1 Pressed, panic level 3
		else if ( ch == KF3 )
			panic( "Test Key F3", 2 );

		// Backspace pressed, blank the current character:
		else if ( ch == BACKSPACE )
			// Put a blank character:
			Print( "\b \b" );

		// Just a normal character:
		else
			putch( ch );		// Just Echo it.
	}

	Freeze();
}

//************************************************************************************************************
//

// Check if FritzOS is on a computer with a video color or mono card -- FritzOS needs a color card.
void CheckVid()
{
	// Let user know that we are...
	Print( "Detecting Color Video Card:\t" );

	if ( DetectVidCard() == COLORCARD )
	{
		// There's a color card..ok...go on to FritzOS and print a message:
		setcolor( BLUE_BLACK );		// Blue on black text
		Print( "[OK]\n" );
		setcolor( WHITE_BLACK );	// return default color

		return;
	}

	// There's not a color card, a mono card...let user know and wait for a key to reboot.
	else if ( DetectVidCard() == MONOCARD )
	{
		setcolor( RED_BLACK );		// Red on black text
		Print( "[NO]\n" );
		setcolor( WHITE_BLACK );	// return default color

		Print( "Sorry, FritzOS can only be used on color video cards. You are using a\n" );
		Print( "mono video card.\n\tPlease Press A Key To Reboot:\t" );

		// wait for a key to reboot:
		getch();

		// Reboot:
		reboot();

		// If couldn't reboot, let user know:
		Print( "Sorry, FritzOS could not reboot your computer. Please turn it off and then back on."
			);

		Freeze();			// Nothing to do, Freeze.
	}
}

// End of kernel32.cpp