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 */
copy_page(void * to,void * from)21 void copy_page(void *to, void *from)
22 {
23 memcpy(to, from, PAGE_SIZE);
24 }
25
__copy_user(void * to,const void * from,__kernel_size_t n)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
__clear_user(void * to,__kernel_size_t n)32 __kernel_size_t __clear_user(void *to, __kernel_size_t n)
33 {
34 memset(to, 0, n);
35 return 0;
36 }
37
local_flush_tlb_all(void)38 void local_flush_tlb_all(void)
39 {
40 BUG();
41 }
42
local_flush_tlb_mm(struct mm_struct * mm)43 void local_flush_tlb_mm(struct mm_struct *mm)
44 {
45 BUG();
46 }
47
local_flush_tlb_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)48 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
49 unsigned long end)
50 {
51 BUG();
52 }
53
local_flush_tlb_page(struct vm_area_struct * vma,unsigned long page)54 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
55 {
56 BUG();
57 }
58
local_flush_tlb_one(unsigned long asid,unsigned long page)59 void local_flush_tlb_one(unsigned long asid, unsigned long page)
60 {
61 BUG();
62 }
63
local_flush_tlb_kernel_range(unsigned long start,unsigned long end)64 void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
65 {
66 BUG();
67 }
68
__flush_tlb_global(void)69 void __flush_tlb_global(void)
70 {
71 }
72
__update_tlb(struct vm_area_struct * vma,unsigned long address,pte_t pte)73 void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
74 {
75 }
76
kmap_coherent_init(void)77 void __init kmap_coherent_init(void)
78 {
79 }
80
kmap_coherent(struct page * page,unsigned long addr)81 void *kmap_coherent(struct page *page, unsigned long addr)
82 {
83 BUG();
84 return NULL;
85 }
86
kunmap_coherent(void * kvaddr)87 void kunmap_coherent(void *kvaddr)
88 {
89 BUG();
90 }
91
page_table_range_init(unsigned long start,unsigned long end,pgd_t * pgd_base)92 void __init page_table_range_init(unsigned long start, unsigned long end,
93 pgd_t *pgd_base)
94 {
95 }
96
__set_fixmap(enum fixed_addresses idx,unsigned long phys,pgprot_t prot)97 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
98 {
99 }
100