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