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Commit | Line | Data |
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1da177e4 LT |
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 | * | |
641e97f3 | 6 | * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org) |
7575a49f | 7 | * Copyright (C) 2007 MIPS Technologies, Inc. |
1da177e4 | 8 | */ |
24e9d0b9 RB |
9 | #include <linux/fs.h> |
10 | #include <linux/fcntl.h> | |
1da177e4 | 11 | #include <linux/kernel.h> |
641e97f3 | 12 | #include <linux/linkage.h> |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/sched.h> | |
dbda6ac0 | 15 | #include <linux/syscalls.h> |
1da177e4 LT |
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); | |
53de0d47 RB |
29 | void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, |
30 | unsigned long pfn); | |
d4264f18 | 31 | void (*flush_icache_range)(unsigned long start, unsigned long end); |
8229f1a0 | 32 | EXPORT_SYMBOL_GPL(flush_icache_range); |
e0cee3ee | 33 | void (*local_flush_icache_range)(unsigned long start, unsigned long end); |
90f91356 | 34 | EXPORT_SYMBOL_GPL(local_flush_icache_range); |
1da177e4 | 35 | |
9c5a3d72 RB |
36 | void (*__flush_cache_vmap)(void); |
37 | void (*__flush_cache_vunmap)(void); | |
38 | ||
d9cdc901 | 39 | void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size); |
d9cdc901 | 40 | EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range); |
8229f1a0 | 41 | void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size); |
d9cdc901 | 42 | |
1da177e4 LT |
43 | /* MIPS specific cache operations */ |
44 | void (*flush_cache_sigtramp)(unsigned long addr); | |
7e3bfc7c | 45 | void (*local_flush_data_cache_page)(void * addr); |
1da177e4 LT |
46 | void (*flush_data_cache_page)(unsigned long addr); |
47 | void (*flush_icache_all)(void); | |
48 | ||
9202f325 | 49 | EXPORT_SYMBOL_GPL(local_flush_data_cache_page); |
9ff77c46 | 50 | EXPORT_SYMBOL(flush_data_cache_page); |
f2e3656d | 51 | EXPORT_SYMBOL(flush_icache_all); |
9ff77c46 | 52 | |
8005711c | 53 | #if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT) |
1da177e4 LT |
54 | |
55 | /* DMA cache operations. */ | |
56 | void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); | |
57 | void (*_dma_cache_wback)(unsigned long start, unsigned long size); | |
58 | void (*_dma_cache_inv)(unsigned long start, unsigned long size); | |
59 | ||
60 | EXPORT_SYMBOL(_dma_cache_wback_inv); | |
1da177e4 | 61 | |
8005711c | 62 | #endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */ |
1da177e4 LT |
63 | |
64 | /* | |
65 | * We could optimize the case where the cache argument is not BCACHE but | |
66 | * that seems very atypical use ... | |
67 | */ | |
dbda6ac0 RB |
68 | SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes, |
69 | unsigned int, cache) | |
1da177e4 | 70 | { |
750ccf68 AN |
71 | if (bytes == 0) |
72 | return 0; | |
fe00f943 | 73 | if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes)) |
1da177e4 LT |
74 | return -EFAULT; |
75 | ||
76 | flush_icache_range(addr, addr + bytes); | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | void __flush_dcache_page(struct page *page) | |
82 | { | |
83 | struct address_space *mapping = page_mapping(page); | |
84 | unsigned long addr; | |
85 | ||
585fa724 RB |
86 | if (PageHighMem(page)) |
87 | return; | |
1da177e4 LT |
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 | addr = (unsigned long) page_address(page); | |
99 | flush_data_cache_page(addr); | |
100 | } | |
101 | ||
102 | EXPORT_SYMBOL(__flush_dcache_page); | |
103 | ||
7575a49f RB |
104 | void __flush_anon_page(struct page *page, unsigned long vmaddr) |
105 | { | |
9a74b3eb | 106 | unsigned long addr = (unsigned long) page_address(page); |
7575a49f | 107 | |
9a74b3eb RB |
108 | if (pages_do_alias(addr, vmaddr)) { |
109 | if (page_mapped(page) && !Page_dcache_dirty(page)) { | |
110 | void *kaddr; | |
111 | ||
112 | kaddr = kmap_coherent(page, vmaddr); | |
113 | flush_data_cache_page((unsigned long)kaddr); | |
114 | kunmap_coherent(); | |
115 | } else | |
116 | flush_data_cache_page(addr); | |
7575a49f RB |
117 | } |
118 | } | |
119 | ||
120 | EXPORT_SYMBOL(__flush_anon_page); | |
121 | ||
4d46a67a LP |
122 | void __flush_icache_page(struct vm_area_struct *vma, struct page *page) |
123 | { | |
124 | unsigned long addr; | |
125 | ||
126 | if (PageHighMem(page)) | |
127 | return; | |
128 | ||
129 | addr = (unsigned long) page_address(page); | |
130 | flush_data_cache_page(addr); | |
131 | } | |
132 | EXPORT_SYMBOL_GPL(__flush_icache_page); | |
133 | ||
5b9593f3 LP |
134 | void __update_cache(struct vm_area_struct *vma, unsigned long address, |
135 | pte_t pte) | |
1da177e4 LT |
136 | { |
137 | struct page *page; | |
5b9593f3 LP |
138 | unsigned long pfn, addr; |
139 | int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc; | |
1da177e4 | 140 | |
5b9593f3 | 141 | pfn = pte_pfn(pte); |
585fa724 RB |
142 | if (unlikely(!pfn_valid(pfn))) |
143 | return; | |
144 | page = pfn_to_page(pfn); | |
145 | if (page_mapping(page) && Page_dcache_dirty(page)) { | |
5b9593f3 LP |
146 | addr = (unsigned long) page_address(page); |
147 | if (exec || pages_do_alias(addr, address & PAGE_MASK)) | |
148 | flush_data_cache_page(addr); | |
1da177e4 LT |
149 | ClearPageDcacheDirty(page); |
150 | } | |
151 | } | |
152 | ||
35133692 | 153 | unsigned long _page_cachable_default; |
7b3e543d | 154 | EXPORT_SYMBOL(_page_cachable_default); |
35133692 CD |
155 | |
156 | static inline void setup_protection_map(void) | |
157 | { | |
05857c64 | 158 | if (cpu_has_rixi) { |
6dd9344c DD |
159 | protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); |
160 | protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); | |
161 | protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); | |
162 | protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); | |
163 | protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ); | |
164 | protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT); | |
165 | protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ); | |
166 | protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT); | |
167 | ||
168 | protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); | |
169 | protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); | |
170 | protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ); | |
171 | protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE); | |
172 | protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ); | |
173 | protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT); | |
174 | protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE | _PAGE_NO_READ); | |
175 | protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE); | |
176 | ||
177 | } else { | |
178 | protection_map[0] = PAGE_NONE; | |
179 | protection_map[1] = PAGE_READONLY; | |
180 | protection_map[2] = PAGE_COPY; | |
181 | protection_map[3] = PAGE_COPY; | |
182 | protection_map[4] = PAGE_READONLY; | |
183 | protection_map[5] = PAGE_READONLY; | |
184 | protection_map[6] = PAGE_COPY; | |
185 | protection_map[7] = PAGE_COPY; | |
186 | protection_map[8] = PAGE_NONE; | |
187 | protection_map[9] = PAGE_READONLY; | |
188 | protection_map[10] = PAGE_SHARED; | |
189 | protection_map[11] = PAGE_SHARED; | |
190 | protection_map[12] = PAGE_READONLY; | |
191 | protection_map[13] = PAGE_READONLY; | |
192 | protection_map[14] = PAGE_SHARED; | |
193 | protection_map[15] = PAGE_SHARED; | |
194 | } | |
35133692 | 195 | } |
1da177e4 | 196 | |
078a55fc | 197 | void cpu_cache_init(void) |
1da177e4 | 198 | { |
02cf2119 RB |
199 | if (cpu_has_3k_cache) { |
200 | extern void __weak r3k_cache_init(void); | |
201 | ||
202 | r3k_cache_init(); | |
02cf2119 RB |
203 | } |
204 | if (cpu_has_6k_cache) { | |
205 | extern void __weak r6k_cache_init(void); | |
206 | ||
207 | r6k_cache_init(); | |
1da177e4 | 208 | } |
02cf2119 RB |
209 | if (cpu_has_4k_cache) { |
210 | extern void __weak r4k_cache_init(void); | |
211 | ||
212 | r4k_cache_init(); | |
02cf2119 RB |
213 | } |
214 | if (cpu_has_8k_cache) { | |
215 | extern void __weak r8k_cache_init(void); | |
216 | ||
217 | r8k_cache_init(); | |
02cf2119 RB |
218 | } |
219 | if (cpu_has_tx39_cache) { | |
220 | extern void __weak tx39_cache_init(void); | |
221 | ||
222 | tx39_cache_init(); | |
02cf2119 | 223 | } |
02cf2119 | 224 | |
47d979ec DD |
225 | if (cpu_has_octeon_cache) { |
226 | extern void __weak octeon_cache_init(void); | |
227 | ||
228 | octeon_cache_init(); | |
229 | } | |
230 | ||
35133692 | 231 | setup_protection_map(); |
1da177e4 | 232 | } |
24e9d0b9 RB |
233 | |
234 | int __weak __uncached_access(struct file *file, unsigned long addr) | |
235 | { | |
6b2f3d1f | 236 | if (file->f_flags & O_DSYNC) |
24e9d0b9 RB |
237 | return 1; |
238 | ||
239 | return addr >= __pa(high_memory); | |
240 | } |