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 /* MIPS specific cache operations */ 39 void (*flush_cache_sigtramp)(unsigned long addr); 40 void (*local_flush_data_cache_page)(void * addr); 41 void (*flush_data_cache_page)(unsigned long addr); 42 void (*flush_icache_all)(void); 43 44 EXPORT_SYMBOL_GPL(local_flush_data_cache_page); 45 EXPORT_SYMBOL(flush_data_cache_page); 46 47 #ifdef CONFIG_DMA_NONCOHERENT 48 49 /* DMA cache operations. */ 50 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); 51 void (*_dma_cache_wback)(unsigned long start, unsigned long size); 52 void (*_dma_cache_inv)(unsigned long start, unsigned long size); 53 54 EXPORT_SYMBOL(_dma_cache_wback_inv); 55 56 #endif /* CONFIG_DMA_NONCOHERENT */ 57 58 /* 59 * We could optimize the case where the cache argument is not BCACHE but 60 * that seems very atypical use ... 61 */ 62 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes, 63 unsigned int, cache) 64 { 65 if (bytes == 0) 66 return 0; 67 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes)) 68 return -EFAULT; 69 70 flush_icache_range(addr, addr + bytes); 71 72 return 0; 73 } 74 75 void __flush_dcache_page(struct page *page) 76 { 77 struct address_space *mapping = page_mapping(page); 78 unsigned long addr; 79 80 if (PageHighMem(page)) 81 return; 82 if (mapping && !mapping_mapped(mapping)) { 83 SetPageDcacheDirty(page); 84 return; 85 } 86 87 /* 88 * We could delay the flush for the !page_mapping case too. But that 89 * case is for exec env/arg pages and those are %99 certainly going to 90 * get faulted into the tlb (and thus flushed) anyways. 91 */ 92 addr = (unsigned long) page_address(page); 93 flush_data_cache_page(addr); 94 } 95 96 EXPORT_SYMBOL(__flush_dcache_page); 97 98 void __flush_anon_page(struct page *page, unsigned long vmaddr) 99 { 100 unsigned long addr = (unsigned long) page_address(page); 101 102 if (pages_do_alias(addr, vmaddr)) { 103 if (page_mapped(page) && !Page_dcache_dirty(page)) { 104 void *kaddr; 105 106 kaddr = kmap_coherent(page, vmaddr); 107 flush_data_cache_page((unsigned long)kaddr); 108 kunmap_coherent(); 109 } else 110 flush_data_cache_page(addr); 111 } 112 } 113 114 EXPORT_SYMBOL(__flush_anon_page); 115 116 void __update_cache(struct vm_area_struct *vma, unsigned long address, 117 pte_t pte) 118 { 119 struct page *page; 120 unsigned long pfn, addr; 121 int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc; 122 123 pfn = pte_pfn(pte); 124 if (unlikely(!pfn_valid(pfn))) 125 return; 126 page = pfn_to_page(pfn); 127 if (page_mapping(page) && Page_dcache_dirty(page)) { 128 addr = (unsigned long) page_address(page); 129 if (exec || pages_do_alias(addr, address & PAGE_MASK)) 130 flush_data_cache_page(addr); 131 ClearPageDcacheDirty(page); 132 } 133 } 134 135 unsigned long _page_cachable_default; 136 EXPORT_SYMBOL_GPL(_page_cachable_default); 137 138 static inline void setup_protection_map(void) 139 { 140 protection_map[0] = PAGE_NONE; 141 protection_map[1] = PAGE_READONLY; 142 protection_map[2] = PAGE_COPY; 143 protection_map[3] = PAGE_COPY; 144 protection_map[4] = PAGE_READONLY; 145 protection_map[5] = PAGE_READONLY; 146 protection_map[6] = PAGE_COPY; 147 protection_map[7] = PAGE_COPY; 148 protection_map[8] = PAGE_NONE; 149 protection_map[9] = PAGE_READONLY; 150 protection_map[10] = PAGE_SHARED; 151 protection_map[11] = PAGE_SHARED; 152 protection_map[12] = PAGE_READONLY; 153 protection_map[13] = PAGE_READONLY; 154 protection_map[14] = PAGE_SHARED; 155 protection_map[15] = PAGE_SHARED; 156 } 157 158 void __devinit cpu_cache_init(void) 159 { 160 if (cpu_has_3k_cache) { 161 extern void __weak r3k_cache_init(void); 162 163 r3k_cache_init(); 164 } 165 if (cpu_has_6k_cache) { 166 extern void __weak r6k_cache_init(void); 167 168 r6k_cache_init(); 169 } 170 if (cpu_has_4k_cache) { 171 extern void __weak r4k_cache_init(void); 172 173 r4k_cache_init(); 174 } 175 if (cpu_has_8k_cache) { 176 extern void __weak r8k_cache_init(void); 177 178 r8k_cache_init(); 179 } 180 if (cpu_has_tx39_cache) { 181 extern void __weak tx39_cache_init(void); 182 183 tx39_cache_init(); 184 } 185 186 if (cpu_has_octeon_cache) { 187 extern void __weak octeon_cache_init(void); 188 189 octeon_cache_init(); 190 } 191 192 setup_protection_map(); 193 } 194 195 int __weak __uncached_access(struct file *file, unsigned long addr) 196 { 197 if (file->f_flags & O_SYNC) 198 return 1; 199 200 return addr >= __pa(high_memory); 201 } 202