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/pgtable.h>
  14 #include <asm/tlbflush.h>
  15 #include <asm/page.h>
  16 #include <linux/uaccess.h>
  17
  18 /*
  19  * Nothing too terribly exciting here ..
  20  */
  21 void copy_page(void *to, void *from)
  22 {
  23         memcpy(to, from, PAGE_SIZE);
  24 }
  25
  26 __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n)
  27 {
  28         memcpy(to, from, n);
  29         return 0;
  30 }
  31
  32 __kernel_size_t __clear_user(void *to, __kernel_size_t n)
  33 {
  34         memset(to, 0, n);
  35         return 0;
  36 }
  37
  38 void local_flush_tlb_all(void)
  39 {
  40         BUG();
  41 }
  42
  43 void local_flush_tlb_mm(struct mm_struct *mm)
  44 {
  45         BUG();
  46 }
  47
  48 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
  49                             unsigned long end)
  50 {
  51         BUG();
  52 }
  53
  54 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
  55 {
  56         BUG();
  57 }
  58
  59 void local_flush_tlb_one(unsigned long asid, unsigned long page)
  60 {
  61         BUG();
  62 }
  63
  64 void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
  65 {
  66         BUG();
  67 }
  68
  69 void __flush_tlb_global(void)
  70 {
  71 }
  72
  73 void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
  74 {
  75 }
  76
  77 void __init kmap_coherent_init(void)
  78 {
  79 }
  80
  81 void *kmap_coherent(struct page *page, unsigned long addr)
  82 {
  83         BUG();
  84         return NULL;
  85 }
  86
  87 void kunmap_coherent(void *kvaddr)
  88 {
  89         BUG();
  90 }
  91
  92 void __init page_table_range_init(unsigned long start, unsigned long end,
  93                                   pgd_t *pgd_base)
  94 {
  95 }
  96
  97 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
  98 {
  99 }