sos-code-article10/userland/myprog3.c

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2018-07-13 17:13:10 +02:00
/* Copyright (C) 2005 David Decotigny
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
*/
#include <debug.h>
/**
* @file myprog3.c
* Test unresolved page fault (write to kernel space)
*/
int main(void)
{
char *c;
int i;
bochs_printf("Prog3: Hello world A !\n");
for (i = 0 ; i < 100000 ; i++)
continue;
bochs_printf("Prog3: Hello world B !\n");
/* Force a page fault */
c = (char*) 0x201000;
/* Try to read somewhere in the kernel space */
i = *c;
bochs_printf("Prog3: Hello world C !\n");
for ( ; i> 0 ; i--)
continue;
bochs_printf("Prog3: Hello world D !\n");
return 0;
}