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
 14#include <asm/cacheflush.h>
 15#include <asm/tlbflush.h>
 16#include <asm/page.h>
 17#include <linux/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 __user *to, __kernel_size_t n)
 34{
 35	memset((__force void *)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}