Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
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#include <asm/setup.h>
24
25/* Cache operations. */
26void (*flush_cache_all)(void);
27void (*__flush_cache_all)(void);
28EXPORT_SYMBOL_GPL(__flush_cache_all);
29void (*flush_cache_mm)(struct mm_struct *mm);
30void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
31 unsigned long end);
32void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
33 unsigned long pfn);
34void (*flush_icache_range)(unsigned long start, unsigned long end);
35EXPORT_SYMBOL_GPL(flush_icache_range);
36void (*local_flush_icache_range)(unsigned long start, unsigned long end);
37EXPORT_SYMBOL_GPL(local_flush_icache_range);
38void (*__flush_icache_user_range)(unsigned long start, unsigned long end);
39EXPORT_SYMBOL_GPL(__flush_icache_user_range);
40void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end);
41EXPORT_SYMBOL_GPL(__local_flush_icache_user_range);
42
43void (*__flush_cache_vmap)(void);
44void (*__flush_cache_vunmap)(void);
45
46void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
47EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
48
49/* MIPS specific cache operations */
50void (*local_flush_data_cache_page)(void * addr);
51void (*flush_data_cache_page)(unsigned long addr);
52void (*flush_icache_all)(void);
53
54EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
55EXPORT_SYMBOL(flush_data_cache_page);
56EXPORT_SYMBOL(flush_icache_all);
57
58#ifdef CONFIG_DMA_NONCOHERENT
59
60/* DMA cache operations. */
61void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
62void (*_dma_cache_wback)(unsigned long start, unsigned long size);
63void (*_dma_cache_inv)(unsigned long start, unsigned long size);
64
65#endif /* CONFIG_DMA_NONCOHERENT */
66
67/*
68 * We could optimize the case where the cache argument is not BCACHE but
69 * that seems very atypical use ...
70 */
71SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
72 unsigned int, cache)
73{
74 if (bytes == 0)
75 return 0;
76 if (!access_ok((void __user *) addr, bytes))
77 return -EFAULT;
78
79 __flush_icache_user_range(addr, addr + bytes);
80
81 return 0;
82}
83
84void __flush_dcache_page(struct page *page)
85{
86 struct address_space *mapping = page_mapping_file(page);
87 unsigned long addr;
88
89 if (mapping && !mapping_mapped(mapping)) {
90 SetPageDcacheDirty(page);
91 return;
92 }
93
94 /*
95 * We could delay the flush for the !page_mapping case too. But that
96 * case is for exec env/arg pages and those are %99 certainly going to
97 * get faulted into the tlb (and thus flushed) anyways.
98 */
99 if (PageHighMem(page))
100 addr = (unsigned long)kmap_atomic(page);
101 else
102 addr = (unsigned long)page_address(page);
103
104 flush_data_cache_page(addr);
105
106 if (PageHighMem(page))
107 __kunmap_atomic((void *)addr);
108}
109
110EXPORT_SYMBOL(__flush_dcache_page);
111
112void __flush_anon_page(struct page *page, unsigned long vmaddr)
113{
114 unsigned long addr = (unsigned long) page_address(page);
115
116 if (pages_do_alias(addr, vmaddr)) {
117 if (page_mapcount(page) && !Page_dcache_dirty(page)) {
118 void *kaddr;
119
120 kaddr = kmap_coherent(page, vmaddr);
121 flush_data_cache_page((unsigned long)kaddr);
122 kunmap_coherent();
123 } else
124 flush_data_cache_page(addr);
125 }
126}
127
128EXPORT_SYMBOL(__flush_anon_page);
129
130void __update_cache(unsigned long address, pte_t pte)
131{
132 struct page *page;
133 unsigned long pfn, addr;
134 int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
135
136 pfn = pte_pfn(pte);
137 if (unlikely(!pfn_valid(pfn)))
138 return;
139 page = pfn_to_page(pfn);
140 if (Page_dcache_dirty(page)) {
141 if (PageHighMem(page))
142 addr = (unsigned long)kmap_atomic(page);
143 else
144 addr = (unsigned long)page_address(page);
145
146 if (exec || pages_do_alias(addr, address & PAGE_MASK))
147 flush_data_cache_page(addr);
148
149 if (PageHighMem(page))
150 __kunmap_atomic((void *)addr);
151
152 ClearPageDcacheDirty(page);
153 }
154}
155
156unsigned long _page_cachable_default;
157EXPORT_SYMBOL(_page_cachable_default);
158
159static inline void setup_protection_map(void)
160{
161 if (cpu_has_rixi) {
162 protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
163 protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
164 protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
165 protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
166 protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
167 protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
168 protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
169 protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
170
171 protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
172 protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
173 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
174 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
175 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
176 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
177 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
178 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
179
180 } else {
181 protection_map[0] = PAGE_NONE;
182 protection_map[1] = PAGE_READONLY;
183 protection_map[2] = PAGE_COPY;
184 protection_map[3] = PAGE_COPY;
185 protection_map[4] = PAGE_READONLY;
186 protection_map[5] = PAGE_READONLY;
187 protection_map[6] = PAGE_COPY;
188 protection_map[7] = PAGE_COPY;
189 protection_map[8] = PAGE_NONE;
190 protection_map[9] = PAGE_READONLY;
191 protection_map[10] = PAGE_SHARED;
192 protection_map[11] = PAGE_SHARED;
193 protection_map[12] = PAGE_READONLY;
194 protection_map[13] = PAGE_READONLY;
195 protection_map[14] = PAGE_SHARED;
196 protection_map[15] = PAGE_SHARED;
197 }
198}
199
200void cpu_cache_init(void)
201{
202 if (cpu_has_3k_cache) {
203 extern void __weak r3k_cache_init(void);
204
205 r3k_cache_init();
206 }
207 if (cpu_has_6k_cache) {
208 extern void __weak r6k_cache_init(void);
209
210 r6k_cache_init();
211 }
212 if (cpu_has_4k_cache) {
213 extern void __weak r4k_cache_init(void);
214
215 r4k_cache_init();
216 }
217 if (cpu_has_8k_cache) {
218 extern void __weak r8k_cache_init(void);
219
220 r8k_cache_init();
221 }
222 if (cpu_has_tx39_cache) {
223 extern void __weak tx39_cache_init(void);
224
225 tx39_cache_init();
226 }
227
228 if (cpu_has_octeon_cache) {
229 extern void __weak octeon_cache_init(void);
230
231 octeon_cache_init();
232 }
233
234 setup_protection_map();
235}
236
237int __weak __uncached_access(struct file *file, unsigned long addr)
238{
239 if (file->f_flags & O_DSYNC)
240 return 1;
241
242 return addr >= __pa(high_memory);
243}