//-------------------------------------------------------------------
//	mm.c
//
//	This module creates a pseudo-file (named '/proc/mm') which
//	displays some info from a task's memory-manager structure.
//
//	NOTE: Written and tested with Linux kernel version 2.4.26.
//
//	programmer: ALLAN CRUSE
//	written on: 21 SEP 2004
//-------------------------------------------------------------------

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

static int my_proc_read( char *buf, char **start, off_t off,
				int count, int *eof, void *data )
{
	struct task_struct	*tsk = current;
	struct mm_struct	*mm = tsk->mm;
	int			len;

	len = sprintf( buf, "\nInfo from the Memory Manager structure " );
	len += sprintf( buf+len, "for task \'%s\' ", tsk->comm );
	len += sprintf( buf+len, "(pid=%d) \n", tsk->pid );
	len += sprintf( buf+len, "   pgd=%08lX  ", mm->pgd );
	len += sprintf( buf+len, "mmap=%08lX  ", mm->mmap );
	len += sprintf( buf+len, "map_count=%d  ", mm->map_count );
	len += sprintf( buf+len, "mm_users=%d  ", mm->mm_users );
	len += sprintf( buf+len, "mm_count=%d  ", mm->mm_count );
	len += sprintf( buf+len, "\n" );
	len += sprintf( buf+len, "    start_code=%08lX  ", mm->start_code );
	len += sprintf( buf+len, " end_code=%08lX\n", mm->end_code );
	len += sprintf( buf+len, "    start_data=%08lX  ", mm->start_data );
	len += sprintf( buf+len, " end_data=%08lX\n", mm->end_data );
	len += sprintf( buf+len, "     start_brk=%08lX  ", mm->start_brk );
	len += sprintf( buf+len, "      brk=%08lX\n", mm->brk );
	len += sprintf( buf+len, "     arg_start=%08lX  ", mm->arg_start );
	len += sprintf( buf+len, "  arg_end=%08lX\n", mm->arg_end );
	len += sprintf( buf+len, "     env_start=%08lX  ", mm->env_start );
	len += sprintf( buf+len, "  env_end=%08lX\n", mm->env_end );
	len += sprintf( buf+len, "   start_stack=%08lX  ", mm->start_stack );
	len += sprintf( buf+len, "end_stack=%08lX\n", 0xC0000000 );
	len += sprintf( buf+len, "\n" );
	return	len;
}

int init_module( void )
{
	create_proc_read_entry( "mm", 0, NULL, my_proc_read, NULL );
	return	0;  // SUCCESS
}

void cleanup_module( void )
{
	remove_proc_entry( "mm", NULL );
}

MODULE_LICENSE("GPL");