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 (*local_flush_data_cache_page)(void * addr); 51 void (*flush_data_cache_page)(unsigned long addr); 52 void (*flush_icache_all)(void); 53 54 EXPORT_SYMBOL_GPL(local_flush_data_cache_page); 55 EXPORT_SYMBOL(flush_data_cache_page); 56 EXPORT_SYMBOL(flush_icache_all); 57 58 #ifdef CONFIG_DMA_NONCOHERENT 59 60 /* DMA cache operations. */ 61 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); 62 void (*_dma_cache_wback)(unsigned long start, unsigned long size); 63 void (*_dma_cache_inv)(unsigned long start, unsigned long size); 64 65 #endif /* CONFIG_DMA_NONCOHERENT */ 66 67 /* 68 * We could optimize the case where the cache argument is not BCACHE but 69 * that seems very atypical use ... 70 */ 71 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes, 72 unsigned int, cache) 73 { 74 if (bytes == 0) 75 return 0; 76 if (!access_ok((void __user *) addr, bytes)) 77 return -EFAULT; 78 79 __flush_icache_user_range(addr, addr + bytes); 80 81 return 0; 82 } 83 84 void __flush_dcache_page(struct page *page) 85 { 86 struct address_space *mapping = page_mapping_file(page); 87 unsigned long addr; 88 89 if (mapping && !mapping_mapped(mapping)) { 90 SetPageDcacheDirty(page); 91 return; 92 } 93 94 /* 95 * We could delay the flush for the !page_mapping case too. But that 96 * case is for exec env/arg pages and those are %99 certainly going to 97 * get faulted into the tlb (and thus flushed) anyways. 98 */ 99 if (PageHighMem(page)) 100 addr = (unsigned long)kmap_atomic(page); 101 else 102 addr = (unsigned long)page_address(page); 103 104 flush_data_cache_page(addr); 105 106 if (PageHighMem(page)) 107 __kunmap_atomic((void *)addr); 108 } 109 110 EXPORT_SYMBOL(__flush_dcache_page); 111 112 void __flush_anon_page(struct page *page, unsigned long vmaddr) 113 { 114 unsigned long addr = (unsigned long) page_address(page); 115 116 if (pages_do_alias(addr, vmaddr)) { 117 if (page_mapcount(page) && !Page_dcache_dirty(page)) { 118 void *kaddr; 119 120 kaddr = kmap_coherent(page, vmaddr); 121 flush_data_cache_page((unsigned long)kaddr); 122 kunmap_coherent(); 123 } else 124 flush_data_cache_page(addr); 125 } 126 } 127 128 EXPORT_SYMBOL(__flush_anon_page); 129 130 void __update_cache(unsigned long address, pte_t pte) 131 { 132 struct page *page; 133 unsigned long pfn, addr; 134 int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc; 135 136 pfn = pte_pfn(pte); 137 if (unlikely(!pfn_valid(pfn))) 138 return; 139 page = pfn_to_page(pfn); 140 if (Page_dcache_dirty(page)) { 141 if (PageHighMem(page)) 142 addr = (unsigned long)kmap_atomic(page); 143 else 144 addr = (unsigned long)page_address(page); 145 146 if (exec || pages_do_alias(addr, address & PAGE_MASK)) 147 flush_data_cache_page(addr); 148 149 if (PageHighMem(page)) 150 __kunmap_atomic((void *)addr); 151 152 ClearPageDcacheDirty(page); 153 } 154 } 155 156 unsigned long _page_cachable_default; 157 EXPORT_SYMBOL(_page_cachable_default); 158 159 static inline void setup_protection_map(void) 160 { 161 if (cpu_has_rixi) { 162 protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 163 protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 164 protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 165 protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 166 protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 167 protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 168 protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 169 protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 170 171 protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 172 protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 173 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ); 174 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE); 175 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 176 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 177 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE); 178 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE); 179 180 } else { 181 protection_map[0] = PAGE_NONE; 182 protection_map[1] = PAGE_READONLY; 183 protection_map[2] = PAGE_COPY; 184 protection_map[3] = PAGE_COPY; 185 protection_map[4] = PAGE_READONLY; 186 protection_map[5] = PAGE_READONLY; 187 protection_map[6] = PAGE_COPY; 188 protection_map[7] = PAGE_COPY; 189 protection_map[8] = PAGE_NONE; 190 protection_map[9] = PAGE_READONLY; 191 protection_map[10] = PAGE_SHARED; 192 protection_map[11] = PAGE_SHARED; 193 protection_map[12] = PAGE_READONLY; 194 protection_map[13] = PAGE_READONLY; 195 protection_map[14] = PAGE_SHARED; 196 protection_map[15] = PAGE_SHARED; 197 } 198 } 199 200 void cpu_cache_init(void) 201 { 202 if (cpu_has_3k_cache) { 203 extern void __weak r3k_cache_init(void); 204 205 r3k_cache_init(); 206 } 207 if (cpu_has_6k_cache) { 208 extern void __weak r6k_cache_init(void); 209 210 r6k_cache_init(); 211 } 212 if (cpu_has_4k_cache) { 213 extern void __weak r4k_cache_init(void); 214 215 r4k_cache_init(); 216 } 217 if (cpu_has_8k_cache) { 218 extern void __weak r8k_cache_init(void); 219 220 r8k_cache_init(); 221 } 222 if (cpu_has_tx39_cache) { 223 extern void __weak tx39_cache_init(void); 224 225 tx39_cache_init(); 226 } 227 228 if (cpu_has_octeon_cache) { 229 extern void __weak octeon_cache_init(void); 230 231 octeon_cache_init(); 232 } 233 234 setup_protection_map(); 235 } 236 237 int __weak __uncached_access(struct file *file, unsigned long addr) 238 { 239 if (file->f_flags & O_DSYNC) 240 return 1; 241 242 return addr >= __pa(high_memory); 243 } 244