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 #include <linux/highmem.h> 18 19 #include <asm/cacheflush.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 void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end); 40 EXPORT_SYMBOL_GPL(__local_flush_icache_user_range); 41 42 void (*__flush_cache_vmap)(void); 43 void (*__flush_cache_vunmap)(void); 44 45 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size); 46 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range); 47 48 /* MIPS specific cache operations */ 49 void (*local_flush_data_cache_page)(void * addr); 50 void (*flush_data_cache_page)(unsigned long addr); 51 void (*flush_icache_all)(void); 52 53 EXPORT_SYMBOL_GPL(local_flush_data_cache_page); 54 EXPORT_SYMBOL(flush_data_cache_page); 55 EXPORT_SYMBOL(flush_icache_all); 56 57 #ifdef CONFIG_DMA_NONCOHERENT 58 59 /* DMA cache operations. */ 60 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); 61 void (*_dma_cache_wback)(unsigned long start, unsigned long size); 62 void (*_dma_cache_inv)(unsigned long start, unsigned long size); 63 64 #endif /* CONFIG_DMA_NONCOHERENT */ 65 66 /* 67 * We could optimize the case where the cache argument is not BCACHE but 68 * that seems very atypical use ... 69 */ 70 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes, 71 unsigned int, cache) 72 { 73 if (bytes == 0) 74 return 0; 75 if (!access_ok((void __user *) addr, bytes)) 76 return -EFAULT; 77 78 __flush_icache_user_range(addr, addr + bytes); 79 80 return 0; 81 } 82 83 void __flush_dcache_page(struct page *page) 84 { 85 struct address_space *mapping = page_mapping_file(page); 86 unsigned long addr; 87 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 if (PageHighMem(page)) 99 addr = (unsigned long)kmap_atomic(page); 100 else 101 addr = (unsigned long)page_address(page); 102 103 flush_data_cache_page(addr); 104 105 if (PageHighMem(page)) 106 kunmap_atomic((void *)addr); 107 } 108 109 EXPORT_SYMBOL(__flush_dcache_page); 110 111 void __flush_anon_page(struct page *page, unsigned long vmaddr) 112 { 113 unsigned long addr = (unsigned long) page_address(page); 114 115 if (pages_do_alias(addr, vmaddr)) { 116 if (page_mapcount(page) && !Page_dcache_dirty(page)) { 117 void *kaddr; 118 119 kaddr = kmap_coherent(page, vmaddr); 120 flush_data_cache_page((unsigned long)kaddr); 121 kunmap_coherent(); 122 } else 123 flush_data_cache_page(addr); 124 } 125 } 126 127 EXPORT_SYMBOL(__flush_anon_page); 128 129 void __update_cache(unsigned long address, pte_t pte) 130 { 131 struct page *page; 132 unsigned long pfn, addr; 133 int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc; 134 135 pfn = pte_pfn(pte); 136 if (unlikely(!pfn_valid(pfn))) 137 return; 138 page = pfn_to_page(pfn); 139 if (Page_dcache_dirty(page)) { 140 if (PageHighMem(page)) 141 addr = (unsigned long)kmap_atomic(page); 142 else 143 addr = (unsigned long)page_address(page); 144 145 if (exec || pages_do_alias(addr, address & PAGE_MASK)) 146 flush_data_cache_page(addr); 147 148 if (PageHighMem(page)) 149 kunmap_atomic((void *)addr); 150 151 ClearPageDcacheDirty(page); 152 } 153 } 154 155 unsigned long _page_cachable_default; 156 EXPORT_SYMBOL(_page_cachable_default); 157 158 #define PM(p) __pgprot(_page_cachable_default | (p)) 159 160 static inline void setup_protection_map(void) 161 { 162 protection_map[0] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 163 protection_map[1] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC); 164 protection_map[2] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 165 protection_map[3] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC); 166 protection_map[4] = PM(_PAGE_PRESENT); 167 protection_map[5] = PM(_PAGE_PRESENT); 168 protection_map[6] = PM(_PAGE_PRESENT); 169 protection_map[7] = PM(_PAGE_PRESENT); 170 171 protection_map[8] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); 172 protection_map[9] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC); 173 protection_map[10] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | 174 _PAGE_NO_READ); 175 protection_map[11] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE); 176 protection_map[12] = PM(_PAGE_PRESENT); 177 protection_map[13] = PM(_PAGE_PRESENT); 178 protection_map[14] = PM(_PAGE_PRESENT | _PAGE_WRITE); 179 protection_map[15] = PM(_PAGE_PRESENT | _PAGE_WRITE); 180 } 181 182 #undef PM 183 184 void 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_4k_cache) { 192 extern void __weak r4k_cache_init(void); 193 194 r4k_cache_init(); 195 } 196 if (cpu_has_tx39_cache) { 197 extern void __weak tx39_cache_init(void); 198 199 tx39_cache_init(); 200 } 201 202 if (cpu_has_octeon_cache) { 203 extern void __weak octeon_cache_init(void); 204 205 octeon_cache_init(); 206 } 207 208 setup_protection_map(); 209 } 210 211 int __weak __uncached_access(struct file *file, unsigned long addr) 212 { 213 if (file->f_flags & O_DSYNC) 214 return 1; 215 216 return addr >= __pa(high_memory); 217 } 218