//-------------------------------------------------------------------
//	vmap.c
//
//	This module creates a pseudo-file (named '/proc/vmap') that 
//	lets an application access some information from the task's
//	page-directory. 
//
//	programmer: ALLAN CRUSE
//	written on: 03 OCT 2004
//-------------------------------------------------------------------

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

#define PROC_DIR  NULL		// use the default directory
#define FILE_MODE  0		// use the default file mode

static char modname[] = "vmap";	// name for the file 


static int my_get_info( char *system_buffer, char **my_buffer, 
			off_t file_position, int system_buffer_length )
{
	struct mm_struct	*mm = current->mm;
	unsigned long		*pgdir = (unsigned long*)mm->pgd;
	int			i, len = 0;
	
	for (i = 0; i < 1024; i++) 
		len += sprintf( system_buffer+len, "%d", pgdir[i]&7 );	

	len += sprintf( system_buffer+len, "\n" ); 
	return	len;
}

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