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/kernel.h>
12 #include <linux/linkage.h>
13 #include <linux/export.h>
14 #include <linux/sched.h>
15 #include <linux/syscalls.h>
16 #include <linux/mm.h>
17 #include <linux/highmem.h>
18
19 #include <asm/cacheflush.h>
20 #include <asm/processor.h>
21 #include <asm/cpu.h>
22 #include <asm/cpu-features.h>
23 #include <asm/setup.h>
24
25 /* Cache operations. */
26 void (*flush_cache_all)(void);
27 void (*__flush_cache_all)(void);
28 EXPORT_SYMBOL_GPL(__flush_cache_all);
29 void (*flush_cache_mm)(struct mm_struct *mm);
30 void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
31 unsigned long end);
32 void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
33 unsigned long pfn);
34 void (*flush_icache_range)(unsigned long start, unsigned long end);
35 EXPORT_SYMBOL_GPL(flush_icache_range);
36 void (*local_flush_icache_range)(unsigned long start, unsigned long end);
37 EXPORT_SYMBOL_GPL(local_flush_icache_range);
38 void (*__flush_icache_user_range)(unsigned long start, unsigned long end);
39 void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end);
40 EXPORT_SYMBOL_GPL(__local_flush_icache_user_range);
41
42 void (*__flush_cache_vmap)(void);
43 void (*__flush_cache_vunmap)(void);
44
45 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
46 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
47
48 /* MIPS specific cache operations */
49 void (*local_flush_data_cache_page)(void * addr);
50 void (*flush_data_cache_page)(unsigned long addr);
51 void (*flush_icache_all)(void);
52
53 EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
54 EXPORT_SYMBOL(flush_data_cache_page);
55 EXPORT_SYMBOL(flush_icache_all);
56
57 #ifdef CONFIG_DMA_NONCOHERENT
58
59 /* DMA cache operations. */
60 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
61 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
62 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
63
64 #endif /* CONFIG_DMA_NONCOHERENT */
65
66 /*
67 * We could optimize the case where the cache argument is not BCACHE but
68 * that seems very atypical use ...
69 */
SYSCALL_DEFINE3(cacheflush,unsigned long,addr,unsigned long,bytes,unsigned int,cache)70 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
71 unsigned int, cache)
72 {
73 if (bytes == 0)
74 return 0;
75 if (!access_ok((void __user *) addr, bytes))
76 return -EFAULT;
77
78 __flush_icache_user_range(addr, addr + bytes);
79
80 return 0;
81 }
82
__flush_dcache_page(struct page * page)83 void __flush_dcache_page(struct page *page)
84 {
85 struct address_space *mapping = page_mapping_file(page);
86 unsigned long addr;
87
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 if (PageHighMem(page))
99 addr = (unsigned long)kmap_atomic(page);
100 else
101 addr = (unsigned long)page_address(page);
102
103 flush_data_cache_page(addr);
104
105 if (PageHighMem(page))
106 kunmap_atomic((void *)addr);
107 }
108
109 EXPORT_SYMBOL(__flush_dcache_page);
110
__flush_anon_page(struct page * page,unsigned long vmaddr)111 void __flush_anon_page(struct page *page, unsigned long vmaddr)
112 {
113 unsigned long addr = (unsigned long) page_address(page);
114
115 if (pages_do_alias(addr, vmaddr)) {
116 if (page_mapcount(page) && !Page_dcache_dirty(page)) {
117 void *kaddr;
118
119 kaddr = kmap_coherent(page, vmaddr);
120 flush_data_cache_page((unsigned long)kaddr);
121 kunmap_coherent();
122 } else
123 flush_data_cache_page(addr);
124 }
125 }
126
127 EXPORT_SYMBOL(__flush_anon_page);
128
__update_cache(unsigned long address,pte_t pte)129 void __update_cache(unsigned long address, pte_t pte)
130 {
131 struct page *page;
132 unsigned long pfn, addr;
133 int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
134
135 pfn = pte_pfn(pte);
136 if (unlikely(!pfn_valid(pfn)))
137 return;
138 page = pfn_to_page(pfn);
139 if (Page_dcache_dirty(page)) {
140 if (PageHighMem(page))
141 addr = (unsigned long)kmap_atomic(page);
142 else
143 addr = (unsigned long)page_address(page);
144
145 if (exec || pages_do_alias(addr, address & PAGE_MASK))
146 flush_data_cache_page(addr);
147
148 if (PageHighMem(page))
149 kunmap_atomic((void *)addr);
150
151 ClearPageDcacheDirty(page);
152 }
153 }
154
155 unsigned long _page_cachable_default;
156 EXPORT_SYMBOL(_page_cachable_default);
157
setup_protection_map(void)158 static inline void setup_protection_map(void)
159 {
160 if (cpu_has_rixi) {
161 protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
162 protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
163 protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
164 protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
165 protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
166 protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
167 protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
168 protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
169
170 protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
171 protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
172 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
173 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
174 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
175 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
176 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
177 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
178
179 } else {
180 protection_map[0] = PAGE_NONE;
181 protection_map[1] = PAGE_READONLY;
182 protection_map[2] = PAGE_COPY;
183 protection_map[3] = PAGE_COPY;
184 protection_map[4] = PAGE_READONLY;
185 protection_map[5] = PAGE_READONLY;
186 protection_map[6] = PAGE_COPY;
187 protection_map[7] = PAGE_COPY;
188 protection_map[8] = PAGE_NONE;
189 protection_map[9] = PAGE_READONLY;
190 protection_map[10] = PAGE_SHARED;
191 protection_map[11] = PAGE_SHARED;
192 protection_map[12] = PAGE_READONLY;
193 protection_map[13] = PAGE_READONLY;
194 protection_map[14] = PAGE_SHARED;
195 protection_map[15] = PAGE_SHARED;
196 }
197 }
198
cpu_cache_init(void)199 void cpu_cache_init(void)
200 {
201 if (cpu_has_3k_cache) {
202 extern void __weak r3k_cache_init(void);
203
204 r3k_cache_init();
205 }
206 if (cpu_has_6k_cache) {
207 extern void __weak r6k_cache_init(void);
208
209 r6k_cache_init();
210 }
211 if (cpu_has_4k_cache) {
212 extern void __weak r4k_cache_init(void);
213
214 r4k_cache_init();
215 }
216 if (cpu_has_8k_cache) {
217 extern void __weak r8k_cache_init(void);
218
219 r8k_cache_init();
220 }
221 if (cpu_has_tx39_cache) {
222 extern void __weak tx39_cache_init(void);
223
224 tx39_cache_init();
225 }
226
227 if (cpu_has_octeon_cache) {
228 extern void __weak octeon_cache_init(void);
229
230 octeon_cache_init();
231 }
232
233 setup_protection_map();
234 }
235
__uncached_access(struct file * file,unsigned long addr)236 int __weak __uncached_access(struct file *file, unsigned long addr)
237 {
238 if (file->f_flags & O_DSYNC)
239 return 1;
240
241 return addr >= __pa(high_memory);
242 }
243