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