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/processor.h> 20 #include <asm/cpu.h> 21 #include <asm/cpu-features.h> 22 23 /* Cache operations. */ 24 void (*flush_cache_all)(void); 25 void (*__flush_cache_all)(void); 26 void (*flush_cache_mm)(struct mm_struct *mm); 27 void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start, 28 unsigned long end); 29 void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, 30 unsigned long pfn); 31 void (*flush_icache_range)(unsigned long start, unsigned long end); 32 EXPORT_SYMBOL_GPL(flush_icache_range); 33 void (*local_flush_icache_range)(unsigned long start, unsigned long end); 34 EXPORT_SYMBOL_GPL(local_flush_icache_range); 35 36 void (*__flush_cache_vmap)(void); 37 void (*__flush_cache_vunmap)(void); 38 39 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size); 40 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range); 41 void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size); 42 43 /* MIPS specific cache operations */ 44 void (*flush_cache_sigtramp)(unsigned long addr); 45 void (*local_flush_data_cache_page)(void * addr); 46 void (*flush_data_cache_page)(unsigned long addr); 47 void (*flush_icache_all)(void); 48 49 EXPORT_SYMBOL_GPL(local_flush_data_cache_page); 50 EXPORT_SYMBOL(flush_data_cache_page); 51 EXPORT_SYMBOL(flush_icache_all); 52 53 #if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT) 54 55 /* DMA cache operations. */ 56 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); 57 void (*_dma_cache_wback)(unsigned long start, unsigned long size); 58 void (*_dma_cache_inv)(unsigned long start, unsigned long size); 59 60 EXPORT_SYMBOL(_dma_cache_wback_inv); 61 62 #endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */ 63 64 /* 65 * We could optimize the case where the cache argument is not BCACHE but 66 * that seems very atypical use ... 67 */ 68 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes, 69 unsigned int, cache) 70 { 71 if (bytes == 0) 72 return 0; 73 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes)) 74 return -EFAULT; 75 76 flush_icache_range(addr, addr + bytes); 77 78 return 0; 79 } 80 81 void __flush_dcache_page(struct page *page) 82 { 83 struct address_space *mapping = page_mapping(page); 84 unsigned long addr; 85 86 if (PageHighMem(page)) 87 return; 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 addr = (unsigned long) page_address(page); 99 flush_data_cache_page(addr); 100 } 101 102 EXPORT_SYMBOL(__flush_dcache_page); 103 104 void __flush_anon_page(struct page *page, unsigned long vmaddr) 105 { 106 unsigned long addr = (unsigned long) page_address(page); 107 108 if (pages_do_alias(addr, vmaddr)) { 109 if (page_mapped(page) && !Page_dcache_dirty(page)) { 110 void *kaddr; 111 112 kaddr = kmap_coherent(page, vmaddr); 113 flush_data_cache_page((unsigned long)kaddr); 114 kunmap_coherent(); 115 } else 116 flush_data_cache_page(addr); 117 } 118 } 119 120 EXPORT_SYMBOL(__flush_anon_page); 121 122 static void mips_flush_dcache_from_pte(pte_t pteval, unsigned long address) 123 { 124 struct page *page; 125 unsigned long pfn = pte_pfn(pteval); 126 127 if (unlikely(!pfn_valid(pfn))) 128 return; 129 130 page = pfn_to_page(pfn); 131 if (page_mapping(page) && Page_dcache_dirty(page)) { 132 unsigned long page_addr = (unsigned long) page_address(page); 133 134 if (!cpu_has_ic_fills_f_dc || 135 pages_do_alias(page_addr, address & PAGE_MASK)) 136 flush_data_cache_page(page_addr); 137 ClearPageDcacheDirty(page); 138 } 139 } 140 141 void set_pte_at(struct mm_struct *mm, unsigned long addr, 142 pte_t *ptep, pte_t pteval) 143 { 144 if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc) { 145 if (pte_present(pteval)) 146 mips_flush_dcache_from_pte(pteval, addr); 147 } 148 149 set_pte(ptep, pteval); 150 } 151 152 unsigned long _page_cachable_default; 153 EXPORT_SYMBOL(_page_cachable_default); 154 155 static inline void setup_protection_map(void) 156 { 157 if (cpu_has_rixi) { 158 protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 159 protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 160 protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 161 protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 162 protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ); 163 protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 164 protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ); 165 protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 166 167 protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 168 protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 169 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ); 170 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE); 171 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ); 172 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 173 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE | _PAGE_NO_READ); 174 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE); 175 176 } else { 177 protection_map[0] = PAGE_NONE; 178 protection_map[1] = PAGE_READONLY; 179 protection_map[2] = PAGE_COPY; 180 protection_map[3] = PAGE_COPY; 181 protection_map[4] = PAGE_READONLY; 182 protection_map[5] = PAGE_READONLY; 183 protection_map[6] = PAGE_COPY; 184 protection_map[7] = PAGE_COPY; 185 protection_map[8] = PAGE_NONE; 186 protection_map[9] = PAGE_READONLY; 187 protection_map[10] = PAGE_SHARED; 188 protection_map[11] = PAGE_SHARED; 189 protection_map[12] = PAGE_READONLY; 190 protection_map[13] = PAGE_READONLY; 191 protection_map[14] = PAGE_SHARED; 192 protection_map[15] = PAGE_SHARED; 193 } 194 } 195 196 void cpu_cache_init(void) 197 { 198 if (cpu_has_3k_cache) { 199 extern void __weak r3k_cache_init(void); 200 201 r3k_cache_init(); 202 } 203 if (cpu_has_6k_cache) { 204 extern void __weak r6k_cache_init(void); 205 206 r6k_cache_init(); 207 } 208 if (cpu_has_4k_cache) { 209 extern void __weak r4k_cache_init(void); 210 211 r4k_cache_init(); 212 } 213 if (cpu_has_8k_cache) { 214 extern void __weak r8k_cache_init(void); 215 216 r8k_cache_init(); 217 } 218 if (cpu_has_tx39_cache) { 219 extern void __weak tx39_cache_init(void); 220 221 tx39_cache_init(); 222 } 223 224 if (cpu_has_octeon_cache) { 225 extern void __weak octeon_cache_init(void); 226 227 octeon_cache_init(); 228 } 229 230 setup_protection_map(); 231 } 232 233 int __weak __uncached_access(struct file *file, unsigned long addr) 234 { 235 if (file->f_flags & O_DSYNC) 236 return 1; 237 238 return addr >= __pa(high_memory); 239 } 240