arch/m32r/mm/fault-nommu.c

   1 /*
   2  *  linux/arch/m32r/mm/fault.c
   3  *
   4  *  Copyright (c) 2001, 2002  Hitoshi Yamamoto, and H. Kondo
   5  *
   6  *  Some code taken from i386 version.
   7  *    Copyright (C) 1995  Linus Torvalds
   8  */
   9
  10 /* $Id: fault-nommu.c,v 1.1 2004/03/30 06:40:59 sakugawa Exp $ */
  11
  12 #include <linux/config.h>
  13 #include <linux/signal.h>
  14 #include <linux/sched.h>
  15 #include <linux/kernel.h>
  16 #include <linux/errno.h>
  17 #include <linux/string.h>
  18 #include <linux/types.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/mman.h>
  21 #include <linux/mm.h>
  22 #include <linux/smp.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/init.h>
  26 #include <linux/vt_kern.h>              /* For unblank_screen() */
  27
  28 #include <asm/m32r.h>
  29 #include <asm/system.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/pgalloc.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/hardirq.h>
  34 #include <asm/mmu_context.h>
  35
  36 extern void die(const char *, struct pt_regs *, long);
  37
  38 #ifndef CONFIG_SMP
  39 asmlinkage unsigned int tlb_entry_i_dat;
  40 asmlinkage unsigned int tlb_entry_d_dat;
  41 #define tlb_entry_i tlb_entry_i_dat
  42 #define tlb_entry_d tlb_entry_d_dat
  43 #else
  44 unsigned int tlb_entry_i_dat[NR_CPUS];
  45 unsigned int tlb_entry_d_dat[NR_CPUS];
  46 #define tlb_entry_i tlb_entry_i_dat[smp_processor_id()]
  47 #define tlb_entry_d tlb_entry_d_dat[smp_processor_id()]
  48 #endif
  49
  50 /*
  51  * Unlock any spinlocks which will prevent us from getting the
  52  * message out
  53  */
  54 void bust_spinlocks(int yes)
  55 {
  56         int loglevel_save = console_loglevel;
  57
  58         if (yes) {
  59                 oops_in_progress = 1;
  60                 return;
  61         }
  62 #ifdef CONFIG_VT
  63         unblank_screen();
  64 #endif
  65         oops_in_progress = 0;
  66         /*
  67          * OK, the message is on the console.  Now we call printk()
  68          * without oops_in_progress set so that printk will give klogd
  69          * a poke.  Hold onto your hats...
  70          */
  71         console_loglevel = 15;          /* NMI oopser may have shut the console up */
  72         printk(" ");
  73         console_loglevel = loglevel_save;
  74 }
  75
  76 void do_BUG(const char *file, int line)
  77 {
  78         bust_spinlocks(1);
  79         printk("kernel BUG at %s:%d!\n", file, line);
  80 }
  81
  82 /*======================================================================*
  83  * do_page_fault()
  84  *======================================================================*
  85  * This routine handles page faults.  It determines the address,
  86  * and the problem, and then passes it off to one of the appropriate
  87  * routines.
  88  *
  89  * ARGUMENT:
  90  *  regs       : M32R SP reg.
  91  *  error_code : See below
  92  *  address    : M32R MMU MDEVA reg. (Operand ACE)
  93  *             : M32R BPC reg. (Instruction ACE)
  94  *
  95  * error_code :
  96  *  bit 0 == 0 means no page found, 1 means protection fault
  97  *  bit 1 == 0 means read, 1 means write
  98  *  bit 2 == 0 means kernel, 1 means user-mode
  99  *======================================================================*/
 100 asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
 101   unsigned long address)
 102 {
 103
 104 /*
 105  * Oops. The kernel tried to access some bad page. We'll have to
 106  * terminate things with extreme prejudice.
 107  */
 108
 109         bust_spinlocks(1);
 110
 111         if (address < PAGE_SIZE)
 112                 printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
 113         else
 114                 printk(KERN_ALERT "Unable to handle kernel paging request");
 115         printk(" at virtual address %08lx\n",address);
 116         printk(" printing bpc:\n");
 117         printk(KERN_ALERT "bpc = %08lx\n", regs->bpc);
 118
 119         die("Oops", regs, error_code);
 120         bust_spinlocks(0);
 121         do_exit(SIGKILL);
 122 }
 123
 124 /*======================================================================*
 125  * update_mmu_cache()
 126  *======================================================================*/
 127 void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
 128         pte_t pte)
 129 {
 130         BUG();
 131 }
 132
 133 /*======================================================================*
 134  * flush_tlb_page() : flushes one page
 135  *======================================================================*/
 136 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 137 {
 138         BUG();
 139 }
 140
 141 /*======================================================================*
 142  * flush_tlb_range() : flushes a range of pages
 143  *======================================================================*/
 144 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 145         unsigned long end)
 146 {
 147         BUG();
 148 }
 149
 150 /*======================================================================*
 151  * flush_tlb_mm() : flushes the specified mm context TLB's
 152  *======================================================================*/
 153 void local_flush_tlb_mm(struct mm_struct *mm)
 154 {
 155         BUG();
 156 }
 157
 158 /*======================================================================*
 159  * flush_tlb_all() : flushes all processes TLBs
 160  *======================================================================*/
 161 void local_flush_tlb_all(void)
 162 {
 163         BUG();
 164 }
 165