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/module.h>
14 #include <linux/sched.h>
15 #include <linux/syscalls.h>
16 #include <linux/mm.h>
17
18 #include <asm/cacheflush.h>
19 #include <asm/highmem.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 EXPORT_SYMBOL_GPL(flush_icache_range);
34 void (*local_flush_icache_range)(unsigned long start, unsigned long end);
35 EXPORT_SYMBOL_GPL(local_flush_icache_range);
36
37 void (*__flush_cache_vmap)(void);
38 void (*__flush_cache_vunmap)(void);
39
40 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
41 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
42 void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
43
44 /* MIPS specific cache operations */
45 void (*flush_cache_sigtramp)(unsigned long addr);
46 void (*local_flush_data_cache_page)(void * addr);
47 void (*flush_data_cache_page)(unsigned long addr);
48 void (*flush_icache_all)(void);
49
50 EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
51 EXPORT_SYMBOL(flush_data_cache_page);
52 EXPORT_SYMBOL(flush_icache_all);
53
54 #if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
55
56 /* DMA cache operations. */
57 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
58 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
59 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
60
61 EXPORT_SYMBOL(_dma_cache_wback_inv);
62
63 #endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */
64
65 /*
66 * We could optimize the case where the cache argument is not BCACHE but
67 * that seems very atypical use ...
68 */
SYSCALL_DEFINE3(cacheflush,unsigned long,addr,unsigned long,bytes,unsigned int,cache)69 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
70 unsigned int, cache)
71 {
72 if (bytes == 0)
73 return 0;
74 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
75 return -EFAULT;
76
77 flush_icache_range(addr, addr + bytes);
78
79 return 0;
80 }
81
__flush_dcache_page(struct page * page)82 void __flush_dcache_page(struct page *page)
83 {
84 struct address_space *mapping = page_mapping(page);
85 unsigned long addr;
86
87 if (mapping && !mapping_mapped(mapping)) {
88 SetPageDcacheDirty(page);
89 return;
90 }
91
92 /*
93 * We could delay the flush for the !page_mapping case too. But that
94 * case is for exec env/arg pages and those are %99 certainly going to
95 * get faulted into the tlb (and thus flushed) anyways.
96 */
97 if (PageHighMem(page))
98 addr = (unsigned long)kmap_atomic(page);
99 else
100 addr = (unsigned long)page_address(page);
101
102 flush_data_cache_page(addr);
103
104 if (PageHighMem(page))
105 __kunmap_atomic((void *)addr);
106 }
107
108 EXPORT_SYMBOL(__flush_dcache_page);
109
__flush_anon_page(struct page * page,unsigned long vmaddr)110 void __flush_anon_page(struct page *page, unsigned long vmaddr)
111 {
112 unsigned long addr = (unsigned long) page_address(page);
113
114 if (pages_do_alias(addr, vmaddr)) {
115 if (page_mapped(page) && !Page_dcache_dirty(page)) {
116 void *kaddr;
117
118 kaddr = kmap_coherent(page, vmaddr);
119 flush_data_cache_page((unsigned long)kaddr);
120 kunmap_coherent();
121 } else
122 flush_data_cache_page(addr);
123 }
124 }
125
126 EXPORT_SYMBOL(__flush_anon_page);
127
__update_cache(unsigned long address,pte_t pte)128 void __update_cache(unsigned long address, pte_t pte)
129 {
130 struct page *page;
131 unsigned long pfn, addr;
132 int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
133
134 pfn = pte_pfn(pte);
135 if (unlikely(!pfn_valid(pfn)))
136 return;
137 page = pfn_to_page(pfn);
138 if (Page_dcache_dirty(page)) {
139 if (PageHighMem(page))
140 addr = (unsigned long)kmap_atomic(page);
141 else
142 addr = (unsigned long)page_address(page);
143
144 if (exec || pages_do_alias(addr, address & PAGE_MASK))
145 flush_data_cache_page(addr);
146
147 if (PageHighMem(page))
148 __kunmap_atomic((void *)addr);
149
150 ClearPageDcacheDirty(page);
151 }
152 }
153
154 unsigned long _page_cachable_default;
155 EXPORT_SYMBOL(_page_cachable_default);
156
setup_protection_map(void)157 static inline void setup_protection_map(void)
158 {
159 if (cpu_has_rixi) {
160 protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
161 protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
162 protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
163 protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
164 protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
165 protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
166 protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
167 protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
168
169 protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
170 protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
171 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
172 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
173 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
174 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
175 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
176 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
177
178 } else {
179 protection_map[0] = PAGE_NONE;
180 protection_map[1] = PAGE_READONLY;
181 protection_map[2] = PAGE_COPY;
182 protection_map[3] = PAGE_COPY;
183 protection_map[4] = PAGE_READONLY;
184 protection_map[5] = PAGE_READONLY;
185 protection_map[6] = PAGE_COPY;
186 protection_map[7] = PAGE_COPY;
187 protection_map[8] = PAGE_NONE;
188 protection_map[9] = PAGE_READONLY;
189 protection_map[10] = PAGE_SHARED;
190 protection_map[11] = PAGE_SHARED;
191 protection_map[12] = PAGE_READONLY;
192 protection_map[13] = PAGE_READONLY;
193 protection_map[14] = PAGE_SHARED;
194 protection_map[15] = PAGE_SHARED;
195 }
196 }
197
cpu_cache_init(void)198 void cpu_cache_init(void)
199 {
200 if (cpu_has_3k_cache) {
201 extern void __weak r3k_cache_init(void);
202
203 r3k_cache_init();
204 }
205 if (cpu_has_6k_cache) {
206 extern void __weak r6k_cache_init(void);
207
208 r6k_cache_init();
209 }
210 if (cpu_has_4k_cache) {
211 extern void __weak r4k_cache_init(void);
212
213 r4k_cache_init();
214 }
215 if (cpu_has_8k_cache) {
216 extern void __weak r8k_cache_init(void);
217
218 r8k_cache_init();
219 }
220 if (cpu_has_tx39_cache) {
221 extern void __weak tx39_cache_init(void);
222
223 tx39_cache_init();
224 }
225
226 if (cpu_has_octeon_cache) {
227 extern void __weak octeon_cache_init(void);
228
229 octeon_cache_init();
230 }
231
232 setup_protection_map();
233 }
234
__uncached_access(struct file * file,unsigned long addr)235 int __weak __uncached_access(struct file *file, unsigned long addr)
236 {
237 if (file->f_flags & O_DSYNC)
238 return 1;
239
240 return addr >= __pa(high_memory);
241 }
242