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