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 */
22 void 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
39 void local_flush_tlb_all(void)
40 {
41 BUG();
42 }
43
44 void local_flush_tlb_mm(struct mm_struct *mm)
45 {
46 BUG();
47 }
48
49 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
50 unsigned long end)
51 {
52 BUG();
53 }
54
55 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
56 {
57 BUG();
58 }
59
60 void local_flush_tlb_one(unsigned long asid, unsigned long page)
61 {
62 BUG();
63 }
64
65 void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
66 {
67 BUG();
68 }
69
70 void __flush_tlb_global(void)
71 {
72 }
73
74 void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
75 {
76 }
77
78 void __init kmap_coherent_init(void)
79 {
80 }
81
82 void *kmap_coherent(struct page *page, unsigned long addr)
83 {
84 BUG();
85 return NULL;
86 }
87
88 void kunmap_coherent(void *kvaddr)
89 {
90 BUG();
91 }
92
93 void __init page_table_range_init(unsigned long start, unsigned long end,
94 pgd_t *pgd_base)
95 {
96 }
97
98 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
99 {
100 }
101
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