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
 31extern void die(const char *, struct pt_regs *, long);
 32
 33#ifndef CONFIG_SMP
 34asmlinkage unsigned int tlb_entry_i_dat;
 35asmlinkage 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
 39unsigned int tlb_entry_i_dat[NR_CPUS];
 40unsigned 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
 45void 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 *======================================================================*/
 69asmlinkage 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 *======================================================================*/
 96void 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 *======================================================================*/
105void 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 *======================================================================*/
113void 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 *======================================================================*/
122void local_flush_tlb_mm(struct mm_struct *mm)
123{
124	BUG();
125}
126
127/*======================================================================*
128 * flush_tlb_all() : flushes all processes TLBs
129 *======================================================================*/
130void local_flush_tlb_all(void)
131{
132	BUG();
133}