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
 32extern void die(const char *, struct pt_regs *, long);
 33
 34#ifndef CONFIG_SMP
 35asmlinkage unsigned int tlb_entry_i_dat;
 36asmlinkage 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
 40unsigned int tlb_entry_i_dat[NR_CPUS];
 41unsigned 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
 46void 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 *======================================================================*/
 70asmlinkage 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 *======================================================================*/
 97void 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 *======================================================================*/
106void 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 *======================================================================*/
114void 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 *======================================================================*/
123void local_flush_tlb_mm(struct mm_struct *mm)
124{
125	BUG();
126}
127
128/*======================================================================*
129 * flush_tlb_all() : flushes all processes TLBs
130 *======================================================================*/
131void local_flush_tlb_all(void)
132{
133	BUG();
134}