1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org) 7 * Copyright (C) 2007 MIPS Technologies, Inc. 8 */ 9 #include <linux/fs.h> 10 #include <linux/fcntl.h> 11 #include <linux/kernel.h> 12 #include <linux/linkage.h> 13 #include <linux/export.h> 14 #include <linux/sched.h> 15 #include <linux/syscalls.h> 16 #include <linux/mm.h> 17 18 #include <asm/cacheflush.h> 19 #include <asm/highmem.h> 20 #include <asm/processor.h> 21 #include <asm/cpu.h> 22 #include <asm/cpu-features.h> 23 #include <asm/setup.h> 24 25 /* Cache operations. */ 26 void (*flush_cache_all)(void); 27 void (*__flush_cache_all)(void); 28 EXPORT_SYMBOL_GPL(__flush_cache_all); 29 void (*flush_cache_mm)(struct mm_struct *mm); 30 void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start, 31 unsigned long end); 32 void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, 33 unsigned long pfn); 34 void (*flush_icache_range)(unsigned long start, unsigned long end); 35 EXPORT_SYMBOL_GPL(flush_icache_range); 36 void (*local_flush_icache_range)(unsigned long start, unsigned long end); 37 EXPORT_SYMBOL_GPL(local_flush_icache_range); 38 void (*__flush_icache_user_range)(unsigned long start, unsigned long end); 39 EXPORT_SYMBOL_GPL(__flush_icache_user_range); 40 void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end); 41 EXPORT_SYMBOL_GPL(__local_flush_icache_user_range); 42 43 void (*__flush_cache_vmap)(void); 44 void (*__flush_cache_vunmap)(void); 45 46 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size); 47 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range); 48 49 /* MIPS specific cache operations */ 50 void (*flush_cache_sigtramp)(unsigned long addr); 51 void (*local_flush_data_cache_page)(void * addr); 52 void (*flush_data_cache_page)(unsigned long addr); 53 void (*flush_icache_all)(void); 54 55 EXPORT_SYMBOL_GPL(local_flush_data_cache_page); 56 EXPORT_SYMBOL(flush_data_cache_page); 57 EXPORT_SYMBOL(flush_icache_all); 58 59 #if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT) 60 61 /* DMA cache operations. */ 62 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); 63 void (*_dma_cache_wback)(unsigned long start, unsigned long size); 64 void (*_dma_cache_inv)(unsigned long start, unsigned long size); 65 66 EXPORT_SYMBOL(_dma_cache_wback_inv); 67 68 #endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */ 69 70 /* 71 * We could optimize the case where the cache argument is not BCACHE but 72 * that seems very atypical use ... 73 */ 74 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes, 75 unsigned int, cache) 76 { 77 if (bytes == 0) 78 return 0; 79 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes)) 80 return -EFAULT; 81 82 __flush_icache_user_range(addr, addr + bytes); 83 84 return 0; 85 } 86 87 void __flush_dcache_page(struct page *page) 88 { 89 struct address_space *mapping = page_mapping(page); 90 unsigned long addr; 91 92 if (mapping && !mapping_mapped(mapping)) { 93 SetPageDcacheDirty(page); 94 return; 95 } 96 97 /* 98 * We could delay the flush for the !page_mapping case too. But that 99 * case is for exec env/arg pages and those are %99 certainly going to 100 * get faulted into the tlb (and thus flushed) anyways. 101 */ 102 if (PageHighMem(page)) 103 addr = (unsigned long)kmap_atomic(page); 104 else 105 addr = (unsigned long)page_address(page); 106 107 flush_data_cache_page(addr); 108 109 if (PageHighMem(page)) 110 __kunmap_atomic((void *)addr); 111 } 112 113 EXPORT_SYMBOL(__flush_dcache_page); 114 115 void __flush_anon_page(struct page *page, unsigned long vmaddr) 116 { 117 unsigned long addr = (unsigned long) page_address(page); 118 119 if (pages_do_alias(addr, vmaddr)) { 120 if (page_mapcount(page) && !Page_dcache_dirty(page)) { 121 void *kaddr; 122 123 kaddr = kmap_coherent(page, vmaddr); 124 flush_data_cache_page((unsigned long)kaddr); 125 kunmap_coherent(); 126 } else 127 flush_data_cache_page(addr); 128 } 129 } 130 131 EXPORT_SYMBOL(__flush_anon_page); 132 133 void __update_cache(unsigned long address, pte_t pte) 134 { 135 struct page *page; 136 unsigned long pfn, addr; 137 int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc; 138 139 pfn = pte_pfn(pte); 140 if (unlikely(!pfn_valid(pfn))) 141 return; 142 page = pfn_to_page(pfn); 143 if (Page_dcache_dirty(page)) { 144 if (PageHighMem(page)) 145 addr = (unsigned long)kmap_atomic(page); 146 else 147 addr = (unsigned long)page_address(page); 148 149 if (exec || pages_do_alias(addr, address & PAGE_MASK)) 150 flush_data_cache_page(addr); 151 152 if (PageHighMem(page)) 153 __kunmap_atomic((void *)addr); 154 155 ClearPageDcacheDirty(page); 156 } 157 } 158 159 unsigned long _page_cachable_default; 160 EXPORT_SYMBOL(_page_cachable_default); 161 162 static inline void setup_protection_map(void) 163 { 164 if (cpu_has_rixi) { 165 protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 166 protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 167 protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 168 protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 169 protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 170 protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 171 protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 172 protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 173 174 protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 175 protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 176 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ); 177 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE); 178 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 179 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 180 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE); 181 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE); 182 183 } else { 184 protection_map[0] = PAGE_NONE; 185 protection_map[1] = PAGE_READONLY; 186 protection_map[2] = PAGE_COPY; 187 protection_map[3] = PAGE_COPY; 188 protection_map[4] = PAGE_READONLY; 189 protection_map[5] = PAGE_READONLY; 190 protection_map[6] = PAGE_COPY; 191 protection_map[7] = PAGE_COPY; 192 protection_map[8] = PAGE_NONE; 193 protection_map[9] = PAGE_READONLY; 194 protection_map[10] = PAGE_SHARED; 195 protection_map[11] = PAGE_SHARED; 196 protection_map[12] = PAGE_READONLY; 197 protection_map[13] = PAGE_READONLY; 198 protection_map[14] = PAGE_SHARED; 199 protection_map[15] = PAGE_SHARED; 200 } 201 } 202 203 void cpu_cache_init(void) 204 { 205 if (cpu_has_3k_cache) { 206 extern void __weak r3k_cache_init(void); 207 208 r3k_cache_init(); 209 } 210 if (cpu_has_6k_cache) { 211 extern void __weak r6k_cache_init(void); 212 213 r6k_cache_init(); 214 } 215 if (cpu_has_4k_cache) { 216 extern void __weak r4k_cache_init(void); 217 218 r4k_cache_init(); 219 } 220 if (cpu_has_8k_cache) { 221 extern void __weak r8k_cache_init(void); 222 223 r8k_cache_init(); 224 } 225 if (cpu_has_tx39_cache) { 226 extern void __weak tx39_cache_init(void); 227 228 tx39_cache_init(); 229 } 230 231 if (cpu_has_octeon_cache) { 232 extern void __weak octeon_cache_init(void); 233 234 octeon_cache_init(); 235 } 236 237 setup_protection_map(); 238 } 239 240 int __weak __uncached_access(struct file *file, unsigned long addr) 241 { 242 if (file->f_flags & O_DSYNC) 243 return 1; 244 245 return addr >= __pa(high_memory); 246 } 247