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