//-------------------------------------------------------------------
//	init_mm.c
//
//	This module creates a pseudo-file named '/proc/init_mm' that
//	lets an application find the location in physical memory for
//	the page-directory that belongs to the kernel's 'init' task.
//
//	NOTE: Developed and tested with Linux kernel version 2.6.10.
//
//	programmer: ALLAN CRUSE
//	written on: 07 FEB 2005
//-------------------------------------------------------------------

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

static char modname[] = "init_mm";
unsigned long physaddr;

static int my_get_info( char *buf, char **start, off_t off, int count )
{
	int	len;

	len = 0;
	len += sprintf( buf+len, "%08lX = __pa( init_mm.pgd ) ", physaddr );
	len += sprintf( buf+len, "\n" );

	return	len;
}


int init_module( void )
{
	printk( "<1>\nInstalling \'%s\' module\n", modname );

	// physical addrress of page-directory for 'init' task
	physaddr = __pa( init_mm.pgd );

	create_proc_info_entry( modname, 0, NULL, my_get_info );
	return	0;  //SUCCESS
}


void cleanup_module( void )
{
	remove_proc_entry( modname, NULL );

	printk( "<1>Removing \'%s\' module\n", modname );
}

MODULE_LICENSE("GPL");