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  */
  20 void 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
  37 void local_flush_tlb_all(void)
  38 {
  39         BUG();
  40 }
  41
  42 void local_flush_tlb_mm(struct mm_struct *mm)
  43 {
  44         BUG();
  45 }
  46
  47 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
  48                             unsigned long end)
  49 {
  50         BUG();
  51 }
  52
  53 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
  54 {
  55         BUG();
  56 }
  57
  58 void local_flush_tlb_one(unsigned long asid, unsigned long page)
  59 {
  60         BUG();
  61 }
  62
  63 void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
  64 {
  65         BUG();
  66 }
  67
  68 void __flush_tlb_global(void)
  69 {
  70 }
  71
  72 void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
  73 {
  74 }
  75
  76 void __init kmap_coherent_init(void)
  77 {
  78 }
  79
  80 void *kmap_coherent(struct page *page, unsigned long addr)
  81 {
  82         BUG();
  83         return NULL;
  84 }
  85
  86 void kunmap_coherent(void *kvaddr)
  87 {
  88         BUG();
  89 }
  90
  91 void __init page_table_range_init(unsigned long start, unsigned long end,
  92                                   pgd_t *pgd_base)
  93 {
  94 }
  95
  96 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
  97 {
  98 }