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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * arch/sh/mm/nommu.c
   4 *
   5 * Various helper routines and stubs for MMUless SH.
   6 *
   7 * Copyright (C) 2002 - 2009 Paul Mundt
   8 */
   9#include <linux/kernel.h>
  10#include <linux/init.h>
  11#include <linux/string.h>
  12#include <linux/mm.h>
  13#include <asm/tlbflush.h>
  14#include <asm/page.h>
  15#include <linux/uaccess.h>
  16
  17/*
  18 * Nothing too terribly exciting here ..
  19 */
  20void copy_page(void *to, void *from)
  21{
  22        memcpy(to, from, PAGE_SIZE);
  23}
  24
  25__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n)
  26{
  27        memcpy(to, from, n);
  28        return 0;
  29}
  30
  31__kernel_size_t __clear_user(void *to, __kernel_size_t n)
  32{
  33        memset(to, 0, n);
  34        return 0;
  35}
  36
  37void local_flush_tlb_all(void)
  38{
  39        BUG();
  40}
  41
  42void local_flush_tlb_mm(struct mm_struct *mm)
  43{
  44        BUG();
  45}
  46
  47void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
  48                            unsigned long end)
  49{
  50        BUG();
  51}
  52
  53void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
  54{
  55        BUG();
  56}
  57
  58void local_flush_tlb_one(unsigned long asid, unsigned long page)
  59{
  60        BUG();
  61}
  62
  63void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
  64{
  65        BUG();
  66}
  67
  68void __flush_tlb_global(void)
  69{
  70}
  71
  72void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
  73{
  74}
  75
  76void __init kmap_coherent_init(void)
  77{
  78}
  79
  80void *kmap_coherent(struct page *page, unsigned long addr)
  81{
  82        BUG();
  83        return NULL;
  84}
  85
  86void kunmap_coherent(void *kvaddr)
  87{
  88        BUG();
  89}
  90
  91void __init page_table_range_init(unsigned long start, unsigned long end,
  92                                  pgd_t *pgd_base)
  93{
  94}
  95
  96void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
  97{
  98}
  99