Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Ralf Baechle | 641e97f | 2007-10-11 23:46:05 +0100 | [diff] [blame] | 6 | * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org) |
Ralf Baechle | 7575a49 | 2007-03-23 21:36:37 +0000 | [diff] [blame] | 7 | * Copyright (C) 2007 MIPS Technologies, Inc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
Ralf Baechle | 24e9d0b96 | 2007-07-10 17:32:56 +0100 | [diff] [blame] | 9 | #include <linux/fs.h> |
| 10 | #include <linux/fcntl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/init.h> |
| 12 | #include <linux/kernel.h> |
Ralf Baechle | 641e97f | 2007-10-11 23:46:05 +0100 | [diff] [blame] | 13 | #include <linux/linkage.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Ralf Baechle | 53de0d4 | 2005-03-18 17:36:42 +0000 | [diff] [blame] | 29 | void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, |
| 30 | unsigned long pfn); |
Atsushi Nemoto | d4264f1 | 2006-01-29 02:27:51 +0900 | [diff] [blame] | 31 | void (*flush_icache_range)(unsigned long start, unsigned long end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Ralf Baechle | 9c5a3d7 | 2008-04-05 15:13:23 +0100 | [diff] [blame] | 33 | void (*__flush_cache_vmap)(void); |
| 34 | void (*__flush_cache_vunmap)(void); |
| 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | /* MIPS specific cache operations */ |
| 37 | void (*flush_cache_sigtramp)(unsigned long addr); |
Ralf Baechle | 7e3bfc7 | 2006-04-05 20:42:04 +0100 | [diff] [blame] | 38 | void (*local_flush_data_cache_page)(void * addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | void (*flush_data_cache_page)(unsigned long addr); |
| 40 | void (*flush_icache_all)(void); |
| 41 | |
Ralf Baechle | 9202f32 | 2006-12-10 18:43:59 +0000 | [diff] [blame] | 42 | EXPORT_SYMBOL_GPL(local_flush_data_cache_page); |
Ralf Baechle | 9ff77c4 | 2005-03-08 14:39:39 +0000 | [diff] [blame] | 43 | EXPORT_SYMBOL(flush_data_cache_page); |
| 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #ifdef CONFIG_DMA_NONCOHERENT |
| 46 | |
| 47 | /* DMA cache operations. */ |
| 48 | void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); |
| 49 | void (*_dma_cache_wback)(unsigned long start, unsigned long size); |
| 50 | void (*_dma_cache_inv)(unsigned long start, unsigned long size); |
| 51 | |
| 52 | EXPORT_SYMBOL(_dma_cache_wback_inv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | #endif /* CONFIG_DMA_NONCOHERENT */ |
| 55 | |
| 56 | /* |
| 57 | * We could optimize the case where the cache argument is not BCACHE but |
| 58 | * that seems very atypical use ... |
| 59 | */ |
Atsushi Nemoto | d4264f1 | 2006-01-29 02:27:51 +0900 | [diff] [blame] | 60 | asmlinkage int sys_cacheflush(unsigned long addr, |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 61 | unsigned long bytes, unsigned int cache) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | { |
Atsushi Nemoto | 750ccf6 | 2005-10-19 19:57:14 +0900 | [diff] [blame] | 63 | if (bytes == 0) |
| 64 | return 0; |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 65 | if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | return -EFAULT; |
| 67 | |
| 68 | flush_icache_range(addr, addr + bytes); |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | void __flush_dcache_page(struct page *page) |
| 74 | { |
| 75 | struct address_space *mapping = page_mapping(page); |
| 76 | unsigned long addr; |
| 77 | |
Ralf Baechle | 585fa72 | 2006-08-12 16:40:08 +0100 | [diff] [blame] | 78 | if (PageHighMem(page)) |
| 79 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | if (mapping && !mapping_mapped(mapping)) { |
| 81 | SetPageDcacheDirty(page); |
| 82 | return; |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * We could delay the flush for the !page_mapping case too. But that |
| 87 | * case is for exec env/arg pages and those are %99 certainly going to |
| 88 | * get faulted into the tlb (and thus flushed) anyways. |
| 89 | */ |
| 90 | addr = (unsigned long) page_address(page); |
| 91 | flush_data_cache_page(addr); |
| 92 | } |
| 93 | |
| 94 | EXPORT_SYMBOL(__flush_dcache_page); |
| 95 | |
Ralf Baechle | 7575a49 | 2007-03-23 21:36:37 +0000 | [diff] [blame] | 96 | void __flush_anon_page(struct page *page, unsigned long vmaddr) |
| 97 | { |
Ralf Baechle | 9a74b3e | 2008-02-16 22:34:25 +0000 | [diff] [blame] | 98 | unsigned long addr = (unsigned long) page_address(page); |
Ralf Baechle | 7575a49 | 2007-03-23 21:36:37 +0000 | [diff] [blame] | 99 | |
Ralf Baechle | 9a74b3e | 2008-02-16 22:34:25 +0000 | [diff] [blame] | 100 | if (pages_do_alias(addr, vmaddr)) { |
| 101 | if (page_mapped(page) && !Page_dcache_dirty(page)) { |
| 102 | void *kaddr; |
| 103 | |
| 104 | kaddr = kmap_coherent(page, vmaddr); |
| 105 | flush_data_cache_page((unsigned long)kaddr); |
| 106 | kunmap_coherent(); |
| 107 | } else |
| 108 | flush_data_cache_page(addr); |
Ralf Baechle | 7575a49 | 2007-03-23 21:36:37 +0000 | [diff] [blame] | 109 | } |
| 110 | } |
| 111 | |
| 112 | EXPORT_SYMBOL(__flush_anon_page); |
| 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | void __update_cache(struct vm_area_struct *vma, unsigned long address, |
| 115 | pte_t pte) |
| 116 | { |
| 117 | struct page *page; |
| 118 | unsigned long pfn, addr; |
Ralf Baechle | 585fa72 | 2006-08-12 16:40:08 +0100 | [diff] [blame] | 119 | int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
| 121 | pfn = pte_pfn(pte); |
Ralf Baechle | 585fa72 | 2006-08-12 16:40:08 +0100 | [diff] [blame] | 122 | if (unlikely(!pfn_valid(pfn))) |
| 123 | return; |
| 124 | page = pfn_to_page(pfn); |
| 125 | if (page_mapping(page) && Page_dcache_dirty(page)) { |
| 126 | addr = (unsigned long) page_address(page); |
| 127 | if (exec || pages_do_alias(addr, address & PAGE_MASK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | flush_data_cache_page(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | ClearPageDcacheDirty(page); |
| 130 | } |
| 131 | } |
| 132 | |
Chris Dearman | 3513369 | 2007-09-19 00:58:24 +0100 | [diff] [blame] | 133 | unsigned long _page_cachable_default; |
| 134 | EXPORT_SYMBOL_GPL(_page_cachable_default); |
| 135 | |
| 136 | static inline void setup_protection_map(void) |
| 137 | { |
| 138 | protection_map[0] = PAGE_NONE; |
| 139 | protection_map[1] = PAGE_READONLY; |
| 140 | protection_map[2] = PAGE_COPY; |
| 141 | protection_map[3] = PAGE_COPY; |
| 142 | protection_map[4] = PAGE_READONLY; |
| 143 | protection_map[5] = PAGE_READONLY; |
| 144 | protection_map[6] = PAGE_COPY; |
| 145 | protection_map[7] = PAGE_COPY; |
| 146 | protection_map[8] = PAGE_NONE; |
| 147 | protection_map[9] = PAGE_READONLY; |
| 148 | protection_map[10] = PAGE_SHARED; |
| 149 | protection_map[11] = PAGE_SHARED; |
| 150 | protection_map[12] = PAGE_READONLY; |
| 151 | protection_map[13] = PAGE_READONLY; |
| 152 | protection_map[14] = PAGE_SHARED; |
| 153 | protection_map[15] = PAGE_SHARED; |
| 154 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Ralf Baechle | 234fcd1 | 2008-03-08 09:56:28 +0000 | [diff] [blame] | 156 | void __devinit cpu_cache_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | { |
Ralf Baechle | 02cf211 | 2005-10-01 13:06:32 +0100 | [diff] [blame] | 158 | if (cpu_has_3k_cache) { |
| 159 | extern void __weak r3k_cache_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Ralf Baechle | 02cf211 | 2005-10-01 13:06:32 +0100 | [diff] [blame] | 161 | r3k_cache_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
Ralf Baechle | 02cf211 | 2005-10-01 13:06:32 +0100 | [diff] [blame] | 163 | if (cpu_has_6k_cache) { |
| 164 | extern void __weak r6k_cache_init(void); |
| 165 | |
| 166 | r6k_cache_init(); |
Ralf Baechle | 02cf211 | 2005-10-01 13:06:32 +0100 | [diff] [blame] | 167 | } |
| 168 | if (cpu_has_4k_cache) { |
| 169 | extern void __weak r4k_cache_init(void); |
| 170 | |
| 171 | r4k_cache_init(); |
Ralf Baechle | 02cf211 | 2005-10-01 13:06:32 +0100 | [diff] [blame] | 172 | } |
| 173 | if (cpu_has_8k_cache) { |
| 174 | extern void __weak r8k_cache_init(void); |
| 175 | |
| 176 | r8k_cache_init(); |
Ralf Baechle | 02cf211 | 2005-10-01 13:06:32 +0100 | [diff] [blame] | 177 | } |
| 178 | if (cpu_has_tx39_cache) { |
| 179 | extern void __weak tx39_cache_init(void); |
| 180 | |
| 181 | tx39_cache_init(); |
Ralf Baechle | 02cf211 | 2005-10-01 13:06:32 +0100 | [diff] [blame] | 182 | } |
Ralf Baechle | 02cf211 | 2005-10-01 13:06:32 +0100 | [diff] [blame] | 183 | |
Chris Dearman | 3513369 | 2007-09-19 00:58:24 +0100 | [diff] [blame] | 184 | setup_protection_map(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
Ralf Baechle | 24e9d0b96 | 2007-07-10 17:32:56 +0100 | [diff] [blame] | 186 | |
| 187 | int __weak __uncached_access(struct file *file, unsigned long addr) |
| 188 | { |
| 189 | if (file->f_flags & O_SYNC) |
| 190 | return 1; |
| 191 | |
| 192 | return addr >= __pa(high_memory); |
| 193 | } |