에프에이리눅스 / 1611_0007_prime_oven

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kernel/linux-imx6_3.14.28/arch/m32r/mm/fault-nommu.c 3.86 KB
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6b13f685e   김민수   BSP 최초 추가 
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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
   */
  
  #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/interrupt.h>
  #include <linux/init.h>
  #include <linux/vt_kern.h>              /* For unblank_screen() */
  
  #include <asm/m32r.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
  
  void do_BUG(const char *file, int line)
  {
  	bust_spinlocks(1);
  	printk("kernel BUG at %s:%d!
  ", 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
  ",address);
  	printk(" printing bpc:
  ");
  	printk(KERN_ALERT "bpc = %08lx
  ", 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 *ptep)
  {
  	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();
  }