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