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