root/fs/umsdos/check.c

/* */

DEFINITIONS

1. check_one_table
2. check_page_tables

   1 /*
   2  * linux/fs/umsdos/check.c
   3  *
   4  *
   5  */
   6 
   7 #include <linux/signal.h>
   8 #include <linux/sched.h>
   9 #include <linux/head.h>
  10 #include <linux/kernel.h>
  11 #include <linux/errno.h>
  12 #include <linux/string.h>
  13 #include <linux/types.h>
  14 #include <linux/ptrace.h>
  15 #include <linux/mman.h>
  16 
  17 #include <asm/system.h>
  18 
  19 extern unsigned long high_memory;
  20 
  21 static int check_one_table(struct pde * page_dir)
     /*  */
  22 {
  23         if (pgd_none(*page_dir))
  24                 return 0;
  25         if (pgd_bad(*page_dir))
  26                 return 1;
  27         return 0;
  28 }
  29 
  30 /*
  31  * This function checks all page tables of "current"
  32  */
  33 void check_page_tables(void)
     /*  */
  34 {
  35         struct pgd * pg_dir;
  36         static int err = 0;
  37 
  38         int stack_level = (long)(&pg_dir)-current->kernel_stack_page;
  39         if (stack_level < 1500) printk ("** %d ** ",stack_level);
  40         pg_dir = PAGE_DIR_OFFSET(current, 0);
  41         if (err == 0) {
  42                 int i;
  43                 for (i = 0 ; i < PTRS_PER_PAGE ; i++,page_dir++){
  44                         int notok = check_one_table(page_dir);
  45                         if (notok){
  46                                 err++;
  47                                 printk ("|%d:%08lx| ",i, page_dir->pgd);
  48                         }
  49                 }
  50                 if (err) printk ("\nErreur MM %d\n",err);
  51         }
  52 }

/* */