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 *to, __kernel_size_t n) 32 { 33 memset(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