//----------------------------------------------------------------
//	redcolor.c
//
//	This is the source-code for an installable Linux Kernel
//	Module (LKM), written with inline assembly language; it uses 
//	Intel's 'rep stosw' instruction to fill the (text-mode)
//	display with red-colored blank-space characters, as was
//	demonstrated in class.  Use our 'mmake.cpp' to compile.  
//
//		compile with: $ ./mmake
//		install with: $ /sbin/insmod redcolor.ko
//		remove using: $ /sbin/rmmod redcolor
//
//	NOTE: Written and tested on Linux kernel version 2.6.10
//
//	programmer: ALLAN CRUSE
//	written on: 10 MAR 2005
//----------------------------------------------------------------

#include <linux/module.h>	

int init_module( void )
{
asm(" 	cld			");  // forward processing used
asm(" 	movl  $0xC00B8000, %edi ");  // vram address (for text)
asm("	movw	$0x4020, %ax	");  // character and attribute
asm("	movl	$0x4000, %ecx	");  // size of vram (in words)
asm("	rep	stosw		");  // fill the text-mode vram 
return	0;  			     // return-code for SUCCESS
}

void cleanup_module( void ) {}

MODULE_LICENSE("GPL");