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 __user *to, __kernel_size_t n) |
32 | { |
33 | memset((__force void *)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 | } |
99 | |