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 #include <linux/signal.h>
  11 #include <linux/sched.h>
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/string.h>
  15 #include <linux/types.h>
  16 #include <linux/ptrace.h>
  17 #include <linux/mman.h>
  18 #include <linux/mm.h>
  19 #include <linux/smp.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/init.h>
  22 #include <linux/vt_kern.h>              /* For unblank_screen() */
  23
  24 #include <asm/m32r.h>
  25 #include <asm/system.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/pgalloc.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/hardirq.h>
  30 #include <asm/mmu_context.h>
  31
  32 extern void die(const char *, struct pt_regs *, long);
  33
  34 #ifndef CONFIG_SMP
  35 asmlinkage unsigned int tlb_entry_i_dat;
  36 asmlinkage unsigned int tlb_entry_d_dat;
  37 #define tlb_entry_i tlb_entry_i_dat
  38 #define tlb_entry_d tlb_entry_d_dat
  39 #else
  40 unsigned int tlb_entry_i_dat[NR_CPUS];
  41 unsigned int tlb_entry_d_dat[NR_CPUS];
  42 #define tlb_entry_i tlb_entry_i_dat[smp_processor_id()]
  43 #define tlb_entry_d tlb_entry_d_dat[smp_processor_id()]
  44 #endif
  45
  46 void do_BUG(const char *file, int line)
  47 {
  48         bust_spinlocks(1);
  49         printk("kernel BUG at %s:%d!\n", file, line);
  50 }
  51
  52 /*======================================================================*
  53  * do_page_fault()
  54  *======================================================================*
  55  * This routine handles page faults.  It determines the address,
  56  * and the problem, and then passes it off to one of the appropriate
  57  * routines.
  58  *
  59  * ARGUMENT:
  60  *  regs       : M32R SP reg.
  61  *  error_code : See below
  62  *  address    : M32R MMU MDEVA reg. (Operand ACE)
  63  *             : M32R BPC reg. (Instruction ACE)
  64  *
  65  * error_code :
  66  *  bit 0 == 0 means no page found, 1 means protection fault
  67  *  bit 1 == 0 means read, 1 means write
  68  *  bit 2 == 0 means kernel, 1 means user-mode
  69  *======================================================================*/
  70 asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
  71   unsigned long address)
  72 {
  73
  74 /*
  75  * Oops. The kernel tried to access some bad page. We'll have to
  76  * terminate things with extreme prejudice.
  77  */
  78
  79         bust_spinlocks(1);
  80
  81         if (address < PAGE_SIZE)
  82                 printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
  83         else
  84                 printk(KERN_ALERT "Unable to handle kernel paging request");
  85         printk(" at virtual address %08lx\n",address);
  86         printk(" printing bpc:\n");
  87         printk(KERN_ALERT "bpc = %08lx\n", regs->bpc);
  88
  89         die("Oops", regs, error_code);
  90         bust_spinlocks(0);
  91         do_exit(SIGKILL);
  92 }
  93
  94 /*======================================================================*
  95  * update_mmu_cache()
  96  *======================================================================*/
  97 void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
  98         pte_t *ptep)
  99 {
 100         BUG();
 101 }
 102
 103 /*======================================================================*
 104  * flush_tlb_page() : flushes one page
 105  *======================================================================*/
 106 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 107 {
 108         BUG();
 109 }
 110
 111 /*======================================================================*
 112  * flush_tlb_range() : flushes a range of pages
 113  *======================================================================*/
 114 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 115         unsigned long end)
 116 {
 117         BUG();
 118 }
 119
 120 /*======================================================================*
 121  * flush_tlb_mm() : flushes the specified mm context TLB's
 122  *======================================================================*/
 123 void local_flush_tlb_mm(struct mm_struct *mm)
 124 {
 125         BUG();
 126 }
 127
 128 /*======================================================================*
 129  * flush_tlb_all() : flushes all processes TLBs
 130  *======================================================================*/
 131 void local_flush_tlb_all(void)
 132 {
 133         BUG();
 134 }