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  */
  22 void 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
  39 void local_flush_tlb_all(void)
  40 {
  41         BUG();
  42 }
  43
  44 void local_flush_tlb_mm(struct mm_struct *mm)
  45 {
  46         BUG();
  47 }
  48
  49 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
  50                             unsigned long end)
  51 {
  52         BUG();
  53 }
  54
  55 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
  56 {
  57         BUG();
  58 }
  59
  60 void local_flush_tlb_one(unsigned long asid, unsigned long page)
  61 {
  62         BUG();
  63 }
  64
  65 void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
  66 {
  67         BUG();
  68 }
  69
  70 void __flush_tlb_global(void)
  71 {
  72 }
  73
  74 void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
  75 {
  76 }
  77
  78 void __init kmap_coherent_init(void)
  79 {
  80 }
  81
  82 void *kmap_coherent(struct page *page, unsigned long addr)
  83 {
  84         BUG();
  85         return NULL;
  86 }
  87
  88 void kunmap_coherent(void *kvaddr)
  89 {
  90         BUG();
  91 }
  92
  93 void __init page_table_range_init(unsigned long start, unsigned long end,
  94                                   pgd_t *pgd_base)
  95 {
  96 }
  97
  98 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
  99 {
 100 }
 101
 102 void pgtable_cache_init(void)
 103 {
 104 }