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 #include <linux/highmem.h>
24
25 /* Cache operations. */
26 void (*flush_cache_all)(void);
27 void (*__flush_cache_all)(void);
28 void (*flush_cache_mm)(struct mm_struct *mm);
29 void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
30 unsigned long end);
31 void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
32 unsigned long pfn);
33 void (*flush_icache_range)(unsigned long start, unsigned long end);
34 void (*local_flush_icache_range)(unsigned long start, unsigned long end);
35
36 void (*__flush_cache_vmap)(unsigned long start, unsigned long end);
37 void (*__flush_cache_vunmap)(unsigned long start, unsigned long end);
38
39 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
40 void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
41
42 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
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 (*mips_flush_data_cache_range)(struct vm_area_struct *vma,
49 unsigned long vaddr, struct page *page, unsigned long addr,
50 unsigned long size);
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(mips_flush_data_cache_range);
56 EXPORT_SYMBOL(flush_icache_all);
57
58 #ifdef CONFIG_DMA_NONCOHERENT
59
60 /* DMA cache operations. */
61 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
62 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
63 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
64
65 EXPORT_SYMBOL(_dma_cache_wback_inv);
66
67 #endif /* CONFIG_DMA_NONCOHERENT */
68
69 /*
70 * We could optimize the case where the cache argument is not BCACHE but
71 * that seems very atypical use ...
72 */
SYSCALL_DEFINE3(cacheflush,unsigned long,addr,unsigned long,bytes,unsigned int,cache)73 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
74 unsigned int, cache)
75 {
76 if (bytes == 0)
77 return 0;
78 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
79 return -EFAULT;
80
81 flush_icache_range(addr, addr + bytes);
82
83 return 0;
84 }
85
__flush_dcache_page(struct page * page)86 void __flush_dcache_page(struct page *page)
87 {
88 void *addr;
89
90 if (page_mapping(page) && !page_mapped(page)) {
91 SetPageDcacheDirty(page);
92 return;
93 }
94
95 /*
96 * We could delay the flush for the !page_mapping case too. But that
97 * case is for exec env/arg pages and those are %99 certainly going to
98 * get faulted into the tlb (and thus flushed) anyways.
99 */
100 if (PageHighMem(page)) {
101 addr = kmap_atomic(page);
102 flush_data_cache_page((unsigned long)addr);
103 kunmap_atomic(addr);
104 } else {
105 addr = (void *) page_address(page);
106 flush_data_cache_page((unsigned long)addr);
107 }
108 ClearPageDcacheDirty(page);
109 }
110
111 EXPORT_SYMBOL(__flush_dcache_page);
112
__flush_anon_page(struct page * page,unsigned long vmaddr)113 void __flush_anon_page(struct page *page, unsigned long vmaddr)
114 {
115 if (!PageHighMem(page)) {
116 unsigned long addr = (unsigned long) page_address(page);
117
118 if (pages_do_alias(addr, vmaddr & PAGE_MASK)) {
119 if (page_mapped(page) && !Page_dcache_dirty(page)) {
120 void *kaddr;
121
122 kaddr = kmap_coherent(page, vmaddr);
123 flush_data_cache_page((unsigned long)kaddr);
124 kunmap_coherent();
125 } else {
126 flush_data_cache_page(addr);
127 ClearPageDcacheDirty(page);
128 }
129 }
130 } else {
131 void *laddr = lowmem_page_address(page);
132
133 if (pages_do_alias((unsigned long)laddr, vmaddr & PAGE_MASK)) {
134 if (page_mapped(page) && !Page_dcache_dirty(page)) {
135 void *kaddr;
136
137 kaddr = kmap_coherent(page, vmaddr);
138 flush_data_cache_page((unsigned long)kaddr);
139 kunmap_coherent();
140 } else {
141 void *kaddr;
142
143 kaddr = kmap_atomic(page);
144 flush_data_cache_page((unsigned long)kaddr);
145 kunmap_atomic(kaddr);
146 ClearPageDcacheDirty(page);
147 }
148 }
149 }
150 }
151
152 EXPORT_SYMBOL(__flush_anon_page);
153
__update_cache(struct vm_area_struct * vma,unsigned long address,pte_t pte)154 void __update_cache(struct vm_area_struct *vma, unsigned long address,
155 pte_t pte)
156 {
157 struct page *page;
158 unsigned long pfn, addr;
159 int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc;
160
161 pfn = pte_pfn(pte);
162 if (unlikely(!pfn_valid(pfn))) {
163 wmb();
164 return;
165 }
166 page = pfn_to_page(pfn);
167 if (page_mapped(page) && Page_dcache_dirty(page)) {
168 void *kaddr = NULL;
169 if (PageHighMem(page)) {
170 addr = (unsigned long)kmap_atomic(page);
171 kaddr = (void *)addr;
172 } else
173 addr = (unsigned long) page_address(page);
174 if (exec || (cpu_has_dc_aliases &&
175 pages_do_alias(addr, address & PAGE_MASK))) {
176 flush_data_cache_page(addr);
177 ClearPageDcacheDirty(page);
178 }
179
180 if (kaddr)
181 kunmap_atomic((void *)kaddr);
182 }
183 wmb(); /* finish any outstanding arch cache flushes before ret to user */
184 }
185
186 unsigned long _page_cachable_default;
187 EXPORT_SYMBOL(_page_cachable_default);
188
setup_protection_map(void)189 static inline void setup_protection_map(void)
190 {
191 if (cpu_has_rixi) {
192 protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
193 protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
194 protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
195 protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
196 protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
197 protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
198 protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
199 protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
200
201 protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
202 protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
203 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
204 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
205 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
206 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
207 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE | _PAGE_NO_READ);
208 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
209
210 } else {
211 protection_map[0] = PAGE_NONE;
212 protection_map[1] = PAGE_READONLY;
213 protection_map[2] = PAGE_COPY;
214 protection_map[3] = PAGE_COPY;
215 protection_map[4] = PAGE_READONLY;
216 protection_map[5] = PAGE_READONLY;
217 protection_map[6] = PAGE_COPY;
218 protection_map[7] = PAGE_COPY;
219 protection_map[8] = PAGE_NONE;
220 protection_map[9] = PAGE_READONLY;
221 protection_map[10] = PAGE_SHARED;
222 protection_map[11] = PAGE_SHARED;
223 protection_map[12] = PAGE_READONLY;
224 protection_map[13] = PAGE_READONLY;
225 protection_map[14] = PAGE_SHARED;
226 protection_map[15] = PAGE_SHARED;
227 }
228 }
229
cpu_cache_init(void)230 void __cpuinit cpu_cache_init(void)
231 {
232 if (cpu_has_3k_cache) {
233 extern void __weak r3k_cache_init(void);
234
235 r3k_cache_init();
236 }
237 if (cpu_has_6k_cache) {
238 extern void __weak r6k_cache_init(void);
239
240 r6k_cache_init();
241 }
242 if (cpu_has_4k_cache) {
243 extern void __weak r4k_cache_init(void);
244
245 r4k_cache_init();
246 }
247 if (cpu_has_8k_cache) {
248 extern void __weak r8k_cache_init(void);
249
250 r8k_cache_init();
251 }
252 if (cpu_has_tx39_cache) {
253 extern void __weak tx39_cache_init(void);
254
255 tx39_cache_init();
256 }
257
258 if (cpu_has_octeon_cache) {
259 extern void __weak octeon_cache_init(void);
260
261 octeon_cache_init();
262 }
263
264 setup_protection_map();
265 }
266
__uncached_access(struct file * file,unsigned long addr)267 int __weak __uncached_access(struct file *file, unsigned long addr)
268 {
269 if (file->f_flags & O_DSYNC)
270 return 1;
271
272 return addr >= __pa(high_memory);
273 }
274