Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / arch / mips / mm / cache.c
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         if (kernel_uses_smartmips_rixi) {
141                 protection_map[0]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
142                 protection_map[1]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
143                 protection_map[2]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
144                 protection_map[3]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
145                 protection_map[4]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
146                 protection_map[5]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
147                 protection_map[6]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
148                 protection_map[7]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
149
150                 protection_map[8]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
151                 protection_map[9]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
152                 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
153                 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
154                 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
155                 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
156                 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE  | _PAGE_NO_READ);
157                 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
158
159         } else {
160                 protection_map[0] = PAGE_NONE;
161                 protection_map[1] = PAGE_READONLY;
162                 protection_map[2] = PAGE_COPY;
163                 protection_map[3] = PAGE_COPY;
164                 protection_map[4] = PAGE_READONLY;
165                 protection_map[5] = PAGE_READONLY;
166                 protection_map[6] = PAGE_COPY;
167                 protection_map[7] = PAGE_COPY;
168                 protection_map[8] = PAGE_NONE;
169                 protection_map[9] = PAGE_READONLY;
170                 protection_map[10] = PAGE_SHARED;
171                 protection_map[11] = PAGE_SHARED;
172                 protection_map[12] = PAGE_READONLY;
173                 protection_map[13] = PAGE_READONLY;
174                 protection_map[14] = PAGE_SHARED;
175                 protection_map[15] = PAGE_SHARED;
176         }
177 }
178
179 void __cpuinit cpu_cache_init(void)
180 {
181         if (cpu_has_3k_cache) {
182                 extern void __weak r3k_cache_init(void);
183
184                 r3k_cache_init();
185         }
186         if (cpu_has_6k_cache) {
187                 extern void __weak r6k_cache_init(void);
188
189                 r6k_cache_init();
190         }
191         if (cpu_has_4k_cache) {
192                 extern void __weak r4k_cache_init(void);
193
194                 r4k_cache_init();
195         }
196         if (cpu_has_8k_cache) {
197                 extern void __weak r8k_cache_init(void);
198
199                 r8k_cache_init();
200         }
201         if (cpu_has_tx39_cache) {
202                 extern void __weak tx39_cache_init(void);
203
204                 tx39_cache_init();
205         }
206
207         if (cpu_has_octeon_cache) {
208                 extern void __weak octeon_cache_init(void);
209
210                 octeon_cache_init();
211         }
212
213         setup_protection_map();
214 }
215
216 int __weak __uncached_access(struct file *file, unsigned long addr)
217 {
218         if (file->f_flags & O_DSYNC)
219                 return 1;
220
221         return addr >= __pa(high_memory);
222 }