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/init.h> 12 #include <linux/kernel.h> 13 #include <linux/linkage.h> 14 #include <linux/module.h> 15 #include <linux/sched.h> 16 #include <linux/syscalls.h> 17 #include <linux/mm.h> 18 19 #include <asm/cacheflush.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 void (*local_flush_icache_range)(unsigned long start, unsigned long end); 34 35 void (*__flush_cache_vmap)(void); 36 void (*__flush_cache_vunmap)(void); 37 38 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size); 39 void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size); 40 41 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range); 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 #ifdef CONFIG_DMA_NONCOHERENT 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 */ 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 void __update_cache(struct vm_area_struct *vma, unsigned long address, 123 pte_t pte) 124 { 125 struct page *page; 126 unsigned long pfn, addr; 127 int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc; 128 129 pfn = pte_pfn(pte); 130 if (unlikely(!pfn_valid(pfn))) 131 return; 132 page = pfn_to_page(pfn); 133 if (page_mapping(page) && Page_dcache_dirty(page)) { 134 addr = (unsigned long) page_address(page); 135 if (exec || pages_do_alias(addr, address & PAGE_MASK)) 136 flush_data_cache_page(addr); 137 ClearPageDcacheDirty(page); 138 } 139 } 140 141 unsigned long _page_cachable_default; 142 EXPORT_SYMBOL(_page_cachable_default); 143 144 static inline void setup_protection_map(void) 145 { 146 if (cpu_has_rixi) { 147 protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 148 protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 149 protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 150 protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 151 protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ); 152 protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 153 protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ); 154 protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 155 156 protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 157 protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); 158 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ); 159 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE); 160 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ); 161 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT); 162 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE | _PAGE_NO_READ); 163 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE); 164 165 } else { 166 protection_map[0] = PAGE_NONE; 167 protection_map[1] = PAGE_READONLY; 168 protection_map[2] = PAGE_COPY; 169 protection_map[3] = PAGE_COPY; 170 protection_map[4] = PAGE_READONLY; 171 protection_map[5] = PAGE_READONLY; 172 protection_map[6] = PAGE_COPY; 173 protection_map[7] = PAGE_COPY; 174 protection_map[8] = PAGE_NONE; 175 protection_map[9] = PAGE_READONLY; 176 protection_map[10] = PAGE_SHARED; 177 protection_map[11] = PAGE_SHARED; 178 protection_map[12] = PAGE_READONLY; 179 protection_map[13] = PAGE_READONLY; 180 protection_map[14] = PAGE_SHARED; 181 protection_map[15] = PAGE_SHARED; 182 } 183 } 184 185 void __cpuinit cpu_cache_init(void) 186 { 187 if (cpu_has_3k_cache) { 188 extern void __weak r3k_cache_init(void); 189 190 r3k_cache_init(); 191 } 192 if (cpu_has_6k_cache) { 193 extern void __weak r6k_cache_init(void); 194 195 r6k_cache_init(); 196 } 197 if (cpu_has_4k_cache) { 198 extern void __weak r4k_cache_init(void); 199 200 r4k_cache_init(); 201 } 202 if (cpu_has_8k_cache) { 203 extern void __weak r8k_cache_init(void); 204 205 r8k_cache_init(); 206 } 207 if (cpu_has_tx39_cache) { 208 extern void __weak tx39_cache_init(void); 209 210 tx39_cache_init(); 211 } 212 213 if (cpu_has_octeon_cache) { 214 extern void __weak octeon_cache_init(void); 215 216 octeon_cache_init(); 217 } 218 219 setup_protection_map(); 220 } 221 222 int __weak __uncached_access(struct file *file, unsigned long addr) 223 { 224 if (file->f_flags & O_DSYNC) 225 return 1; 226 227 return addr >= __pa(high_memory); 228 } 229