error.h

FritzOS - 简单的C++开发OS的实例// 英文

/* error.h : FritzOS Error Header File For The FritzOS C++ Kernel
   Copyright (C) 2002 Tom Fritz

 * 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.
*/

// defines:

#ifndef ERROR_H
#define ERROR_H

#ifndef FSTDIO_H
#error error.h needs fstdio.h . it should be in the include directory.
#endif

// voids:
// panic function
void panic( char* msg, int errlev );		// 3 error levels supported

// Put the registers on the screen:
void DumpRegs();

// Externs in kernelasm.asm, for getting register values:
extern "C" unsigned long geteax();
extern "C" unsigned long getebx();
extern "C" unsigned long getecx();
extern "C" unsigned long getedx();
extern "C" unsigned int getcs();
extern "C" unsigned int getds();
extern "C" unsigned int getes();
extern "C" unsigned int getfs();
extern "C" unsigned int getgs();
extern "C" unsigned int getss();
extern "C" unsigned long getedi();
extern "C" unsigned long getesi();
extern "C" unsigned long getebp();
extern "C" unsigned long getesp();
extern "C" unsigned long geteflags();

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

// Example:	panic( /*The Message*/, /*The level of the error*/ );
void panic( char* msg, int errlev )
{
	// Save the current textmode text color:
	int txtclr;

	txtclr = textattrib;

	setcolor( RED_BLACK );		// FritzOS Error Color
	clrscr();			// Clear the screen
	Print( "FritzOS Error: %s\n", msg );

	// Dump the registers:
	DumpRegs();

	switch ( errlev )
	{
		// The higher the error level, the more restrictions.
		// Error Level 0
		case 0:
			// Error Level 0 just prints the error and waits for a key to press, then returns.
			Print( "\nPress a key to continue.\n" );

			// Wait for a key:
			getch();

			clrscr();	// Clear the screen

			// Return:
			break;

		// Error Level 1
		case 1:
			// Error Level 1 prints the error and waits for a key press to reboot.
			Print( "\nPress a key to reboot.\n" );

			// Wait for a key:
			getch();

			// Reboot:
			reboot();

			// If the computer didn't reboot, let user know.
			Print( "Sorry, FritzOS could not reboot the computer. Please turn off the\n" );
			Print( "computer, then back on.\n" );

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

			// Return ( this never happens ):
			break;

		// Error Level 2
		case 2:
			// Error Level 2 just prints the error, and freezes.
			Print( "\nComputer Frozen\nPlease turn off the computer, then back on.\n" );

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

			// Return ( this never happens ):
			break;

		// Else, nothing
		default:
			break;	// Return
	}

	// Put back the saved color:
	setcolor( txtclr );
}

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

// Example: DumpRegs();		// Registers Dumped.
void DumpRegs()
{
	// Print All 32-Bit registers ( actually, most ) and even EFLAGS.
	Print( "Register Dump:\n" );
	Print( "EAX=0x%x\tEBX=0x%x\tECX=0x%x\tEDX=0x%x\n", geteax(), getebx(), getecx(), getedx() );
	Print( "CS=0x%x\tDS=0x%x\tES=0x%x\tFS=0x%x\n", getcs(), getds(), getes(), getfs() );
	Print( "SS=0x%x\tESP=0x%x\tEFLAGS=0x%x", getss(), getesp(), geteflags() );
}

#endif

// end of error.h