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}
134