//-------------------------------------------------------------------
//	nocache.c
//
//	The processor's cache mechanism is disabled when this module 
//	is installed and it is reenabled when the module is removed.
//
//	NOTE: This module was written for a single-processor system. 
//
//	programmer: ALLAN CRUSE
//	written on: 12 SEP 2004
//-------------------------------------------------------------------

#include <linux/module.h>	// for init_module() 

static char modname[] = "nocache";

int init_module( void )
{
	printk( "<1>\nInstalling \'%s\' module\n", modname );
	asm(" wbinvd ");
	asm(" movl %cr0, %eax ");
	asm(" orl  $0x60000000, %eax ");
	asm(" movl %eax, %cr0 ");
	printk( "  cache has been disabled \n" );
	return	0; // SUCCESS
}


void cleanup_module( void )
{
	printk( "  cache is being reenabled \n" );
	asm(" movl %cr0, %eax ");
	asm(" andl  $0x9FFFFFFF, %eax ");
	asm(" movl %eax, %cr0 ");
	printk( "<1>Removing \'%s\' module\n", modname );
}

MODULE_LICENSE("GPL");