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/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 void (*local_flush_icache_range)(unsigned long start, unsigned long end); 33 34 void (*__flush_cache_vmap)(void); 35 void (*__flush_cache_vunmap)(void); 36 37 /* MIPS specific cache operations */ 38 void (*flush_cache_sigtramp)(unsigned long addr); 39 void (*local_flush_data_cache_page)(void * addr); 40 void (*flush_data_cache_page)(unsigned long addr); 41 void (*flush_icache_all)(void); 42 43 EXPORT_SYMBOL_GPL(local_flush_data_cache_page); 44 EXPORT_SYMBOL(flush_data_cache_page); 45 46 #ifdef CONFIG_DMA_NONCOHERENT 47 48 /* DMA cache operations. */ 49 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); 50 void (*_dma_cache_wback)(unsigned long start, unsigned long size); 51 void (*_dma_cache_inv)(unsigned long start, unsigned long size); 52 53 EXPORT_SYMBOL(_dma_cache_wback_inv); 54 55 #endif /* CONFIG_DMA_NONCOHERENT */ 56 57 /* 58 * We could optimize the case where the cache argument is not BCACHE but 59 * that seems very atypical use ... 60 */ 61 asmlinkage int sys_cacheflush(unsigned long addr, 62 unsigned long bytes, unsigned int cache) 63 { 64 if (bytes == 0) 65 return 0; 66 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes)) 67 return -EFAULT; 68 69 flush_icache_range(addr, addr + bytes); 70 71 return 0; 72 } 73 74 void __flush_dcache_page(struct page *page) 75 { 76 struct address_space *mapping = page_mapping(page); 77 unsigned long addr; 78 79 if (PageHighMem(page)) 80 return; 81 if (mapping && !mapping_mapped(mapping)) { 82 SetPageDcacheDirty(page); 83 return; 84 } 85 86 /* 87 * We could delay the flush for the !page_mapping case too. But that 88 * case is for exec env/arg pages and those are %99 certainly going to 89 * get faulted into the tlb (and thus flushed) anyways. 90 */ 91 addr = (unsigned long) page_address(page); 92 flush_data_cache_page(addr); 93 } 94 95 EXPORT_SYMBOL(__flush_dcache_page); 96 97 void __flush_anon_page(struct page *page, unsigned long vmaddr) 98 { 99 unsigned long addr = (unsigned long) page_address(page); 100 101 if (pages_do_alias(addr, vmaddr)) { 102 if (page_mapped(page) && !Page_dcache_dirty(page)) { 103 void *kaddr; 104 105 kaddr = kmap_coherent(page, vmaddr); 106 flush_data_cache_page((unsigned long)kaddr); 107 kunmap_coherent(); 108 } else 109 flush_data_cache_page(addr); 110 } 111 } 112 113 EXPORT_SYMBOL(__flush_anon_page); 114 115 void __update_cache(struct vm_area_struct *vma, unsigned long address, 116 pte_t pte) 117 { 118 struct page *page; 119 unsigned long pfn, addr; 120 int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc; 121 122 pfn = pte_pfn(pte); 123 if (unlikely(!pfn_valid(pfn))) 124 return; 125 page = pfn_to_page(pfn); 126 if (page_mapping(page) && Page_dcache_dirty(page)) { 127 addr = (unsigned long) page_address(page); 128 if (exec || pages_do_alias(addr, address & PAGE_MASK)) 129 flush_data_cache_page(addr); 130 ClearPageDcacheDirty(page); 131 } 132 } 133 134 unsigned long _page_cachable_default; 135 EXPORT_SYMBOL_GPL(_page_cachable_default); 136 137 static inline void setup_protection_map(void) 138 { 139 protection_map[0] = PAGE_NONE; 140 protection_map[1] = PAGE_READONLY; 141 protection_map[2] = PAGE_COPY; 142 protection_map[3] = PAGE_COPY; 143 protection_map[4] = PAGE_READONLY; 144 protection_map[5] = PAGE_READONLY; 145 protection_map[6] = PAGE_COPY; 146 protection_map[7] = PAGE_COPY; 147 protection_map[8] = PAGE_NONE; 148 protection_map[9] = PAGE_READONLY; 149 protection_map[10] = PAGE_SHARED; 150 protection_map[11] = PAGE_SHARED; 151 protection_map[12] = PAGE_READONLY; 152 protection_map[13] = PAGE_READONLY; 153 protection_map[14] = PAGE_SHARED; 154 protection_map[15] = PAGE_SHARED; 155 } 156 157 void __devinit cpu_cache_init(void) 158 { 159 if (cpu_has_3k_cache) { 160 extern void __weak r3k_cache_init(void); 161 162 r3k_cache_init(); 163 } 164 if (cpu_has_6k_cache) { 165 extern void __weak r6k_cache_init(void); 166 167 r6k_cache_init(); 168 } 169 if (cpu_has_4k_cache) { 170 extern void __weak r4k_cache_init(void); 171 172 r4k_cache_init(); 173 } 174 if (cpu_has_8k_cache) { 175 extern void __weak r8k_cache_init(void); 176 177 r8k_cache_init(); 178 } 179 if (cpu_has_tx39_cache) { 180 extern void __weak tx39_cache_init(void); 181 182 tx39_cache_init(); 183 } 184 185 setup_protection_map(); 186 } 187 188 int __weak __uncached_access(struct file *file, unsigned long addr) 189 { 190 if (file->f_flags & O_SYNC) 191 return 1; 192 193 return addr >= __pa(high_memory); 194 } 195