LXR linux/arch/sh/mm/nommu.c

   1/*
   2 * arch/sh/mm/nommu.c
   3 *
   4 * Various helper routines and stubs for MMUless SH.
   5 *
   6 * Copyright (C) 2002 - 2009 Paul Mundt
   7 *
   8 * Released under the terms of the GNU GPL v2.0.
   9 */
  10#include <linux/kernel.h>
  11#include <linux/init.h>
  12#include <linux/string.h>
  13#include <linux/mm.h>
  14#include <asm/pgtable.h>
  15#include <asm/tlbflush.h>
  16#include <asm/page.h>
  17#include <asm/uaccess.h>
  18
  19/*
  20 * Nothing too terribly exciting here ..
  21 */
  22void copy_page(void *to, void *from)
  23{
  24        memcpy(to, from, PAGE_SIZE);
  25}
  26
  27__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n)
  28{
  29        memcpy(to, from, n);
  30        return 0;
  31}
  32
  33__kernel_size_t __clear_user(void *to, __kernel_size_t n)
  34{
  35        memset(to, 0, n);
  36        return 0;
  37}
  38
  39void local_flush_tlb_all(void)
  40{
  41        BUG();
  42}
  43
  44void local_flush_tlb_mm(struct mm_struct *mm)
  45{
  46        BUG();
  47}
  48
  49void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
  50                            unsigned long end)
  51{
  52        BUG();
  53}
  54
  55void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
  56{
  57        BUG();
  58}
  59
  60void local_flush_tlb_one(unsigned long asid, unsigned long page)
  61{
  62        BUG();
  63}
  64
  65void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
  66{
  67        BUG();
  68}
  69
  70void __flush_tlb_global(void)
  71{
  72}
  73
  74void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
  75{
  76}
  77
  78void __init kmap_coherent_init(void)
  79{
  80}
  81
  82void *kmap_coherent(struct page *page, unsigned long addr)
  83{
  84        BUG();
  85        return NULL;
  86}
  87
  88void kunmap_coherent(void *kvaddr)
  89{
  90        BUG();
  91}
  92
  93void __init page_table_range_init(unsigned long start, unsigned long end,
  94                                  pgd_t *pgd_base)
  95{
  96}
  97
  98void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
  99{
 100}
 101
 102void pgtable_cache_init(void)
 103{
 104}
 105