xref: /openbmc/linux/arch/sh/mm/nommu.c (revision 2a598d0b) 
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