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 pte)
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}
135