1 /* 2 * Based on arch/arm/include/asm/cacheflush.h 3 * 4 * Copyright (C) 1999-2002 Russell King. 5 * Copyright (C) 2012 ARM Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 #ifndef __ASM_CACHEFLUSH_H 20 #define __ASM_CACHEFLUSH_H 21 22 #include <linux/mm.h> 23 24 /* 25 * This flag is used to indicate that the page pointed to by a pte is clean 26 * and does not require cleaning before returning it to the user. 27 */ 28 #define PG_dcache_clean PG_arch_1 29 30 /* 31 * MM Cache Management 32 * =================== 33 * 34 * The arch/arm64/mm/cache.S implements these methods. 35 * 36 * Start addresses are inclusive and end addresses are exclusive; start 37 * addresses should be rounded down, end addresses up. 38 * 39 * See Documentation/cachetlb.txt for more information. Please note that 40 * the implementation assumes non-aliasing VIPT D-cache and (aliasing) 41 * VIPT or ASID-tagged VIVT I-cache. 42 * 43 * flush_cache_mm(mm) 44 * 45 * Clean and invalidate all user space cache entries 46 * before a change of page tables. 47 * 48 * flush_icache_range(start, end) 49 * 50 * Ensure coherency between the I-cache and the D-cache in the 51 * region described by start, end. 52 * - start - virtual start address 53 * - end - virtual end address 54 * 55 * __flush_cache_user_range(start, end) 56 * 57 * Ensure coherency between the I-cache and the D-cache in the 58 * region described by start, end. 59 * - start - virtual start address 60 * - end - virtual end address 61 * 62 * __flush_dcache_area(kaddr, size) 63 * 64 * Ensure that the data held in page is written back. 65 * - kaddr - page address 66 * - size - region size 67 */ 68 extern void flush_icache_range(unsigned long start, unsigned long end); 69 extern void __flush_dcache_area(void *addr, size_t len); 70 extern void __clean_dcache_area_poc(void *addr, size_t len); 71 extern void __clean_dcache_area_pou(void *addr, size_t len); 72 extern long __flush_cache_user_range(unsigned long start, unsigned long end); 73 extern void sync_icache_aliases(void *kaddr, unsigned long len); 74 75 static inline void flush_cache_mm(struct mm_struct *mm) 76 { 77 } 78 79 static inline void flush_cache_page(struct vm_area_struct *vma, 80 unsigned long user_addr, unsigned long pfn) 81 { 82 } 83 84 static inline void flush_cache_range(struct vm_area_struct *vma, 85 unsigned long start, unsigned long end) 86 { 87 } 88 89 /* 90 * Cache maintenance functions used by the DMA API. No to be used directly. 91 */ 92 extern void __dma_map_area(const void *, size_t, int); 93 extern void __dma_unmap_area(const void *, size_t, int); 94 extern void __dma_flush_area(const void *, size_t); 95 96 /* 97 * Copy user data from/to a page which is mapped into a different 98 * processes address space. Really, we want to allow our "user 99 * space" model to handle this. 100 */ 101 extern void copy_to_user_page(struct vm_area_struct *, struct page *, 102 unsigned long, void *, const void *, unsigned long); 103 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \ 104 do { \ 105 memcpy(dst, src, len); \ 106 } while (0) 107 108 #define flush_cache_dup_mm(mm) flush_cache_mm(mm) 109 110 /* 111 * flush_dcache_page is used when the kernel has written to the page 112 * cache page at virtual address page->virtual. 113 * 114 * If this page isn't mapped (ie, page_mapping == NULL), or it might 115 * have userspace mappings, then we _must_ always clean + invalidate 116 * the dcache entries associated with the kernel mapping. 117 * 118 * Otherwise we can defer the operation, and clean the cache when we are 119 * about to change to user space. This is the same method as used on SPARC64. 120 * See update_mmu_cache for the user space part. 121 */ 122 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 123 extern void flush_dcache_page(struct page *); 124 125 static inline void __flush_icache_all(void) 126 { 127 asm("ic ialluis"); 128 dsb(ish); 129 } 130 131 #define flush_dcache_mmap_lock(mapping) \ 132 spin_lock_irq(&(mapping)->tree_lock) 133 #define flush_dcache_mmap_unlock(mapping) \ 134 spin_unlock_irq(&(mapping)->tree_lock) 135 136 /* 137 * We don't appear to need to do anything here. In fact, if we did, we'd 138 * duplicate cache flushing elsewhere performed by flush_dcache_page(). 139 */ 140 #define flush_icache_page(vma,page) do { } while (0) 141 142 /* 143 * Not required on AArch64 (PIPT or VIPT non-aliasing D-cache). 144 */ 145 static inline void flush_cache_vmap(unsigned long start, unsigned long end) 146 { 147 } 148 149 static inline void flush_cache_vunmap(unsigned long start, unsigned long end) 150 { 151 } 152 153 int set_memory_ro(unsigned long addr, int numpages); 154 int set_memory_rw(unsigned long addr, int numpages); 155 int set_memory_x(unsigned long addr, int numpages); 156 int set_memory_nx(unsigned long addr, int numpages); 157 158 #endif 159