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/*
* linux/arch/m32r/mm/fault.c
*
* Copyright (c) 2001, 2002 Hitoshi Yamamoto, and H. Kondo
*
* Some code taken from i386 version.
* Copyright (C) 1995 Linus Torvalds
*/
/* $Id: fault-nommu.c,v 1.1 2004/03/30 06:40:59 sakugawa Exp $ */
#include <linux/config.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/vt_kern.h> /* For unblank_screen() */
#include <asm/m32r.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/hardirq.h>
#include <asm/mmu_context.h>
extern void die(const char *, struct pt_regs *, long);
#ifndef CONFIG_SMP
asmlinkage unsigned int tlb_entry_i_dat;
asmlinkage unsigned int tlb_entry_d_dat;
#define tlb_entry_i tlb_entry_i_dat
#define tlb_entry_d tlb_entry_d_dat
#else
unsigned int tlb_entry_i_dat[NR_CPUS];
unsigned int tlb_entry_d_dat[NR_CPUS];
#define tlb_entry_i tlb_entry_i_dat[smp_processor_id()]
#define tlb_entry_d tlb_entry_d_dat[smp_processor_id()]
#endif
/*
* Unlock any spinlocks which will prevent us from getting the
* message out
*/
void bust_spinlocks(int yes)
{
int loglevel_save = console_loglevel;
if (yes) {
oops_in_progress = 1;
return;
}
#ifdef CONFIG_VT
unblank_screen();
#endif
oops_in_progress = 0;
/*
* OK, the message is on the console. Now we call printk()
* without oops_in_progress set so that printk will give klogd
* a poke. Hold onto your hats...
*/
console_loglevel = 15; /* NMI oopser may have shut the console up */
printk(" ");
console_loglevel = loglevel_save;
}
void do_BUG(const char *file, int line)
{
bust_spinlocks(1);
printk("kernel BUG at %s:%d!\n", file, line);
}
/*======================================================================*
* do_page_fault()
*======================================================================*
* This routine handles page faults. It determines the address,
* and the problem, and then passes it off to one of the appropriate
* routines.
*
* ARGUMENT:
* regs : M32R SP reg.
* error_code : See below
* address : M32R MMU MDEVA reg. (Operand ACE)
* : M32R BPC reg. (Instruction ACE)
*
* error_code :
* bit 0 == 0 means no page found, 1 means protection fault
* bit 1 == 0 means read, 1 means write
* bit 2 == 0 means kernel, 1 means user-mode
*======================================================================*/
asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
unsigned long address)
{
/*
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice.
*/
bust_spinlocks(1);
if (address < PAGE_SIZE)
printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
else
printk(KERN_ALERT "Unable to handle kernel paging request");
printk(" at virtual address %08lx\n",address);
printk(" printing bpc:\n");
printk(KERN_ALERT "bpc = %08lx\n", regs->bpc);
die("Oops", regs, error_code);
bust_spinlocks(0);
do_exit(SIGKILL);
}
/*======================================================================*
* update_mmu_cache()
*======================================================================*/
void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
pte_t pte)
{
BUG();
}
/*======================================================================*
* flush_tlb_page() : flushes one page
*======================================================================*/
void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
BUG();
}
/*======================================================================*
* flush_tlb_range() : flushes a range of pages
*======================================================================*/
void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
BUG();
}
/*======================================================================*
* flush_tlb_mm() : flushes the specified mm context TLB's
*======================================================================*/
void local_flush_tlb_mm(struct mm_struct *mm)
{
BUG();
}
/*======================================================================*
* flush_tlb_all() : flushes all processes TLBs
*======================================================================*/
void local_flush_tlb_all(void)
{
BUG();
}
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