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