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 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
39 void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
40
41 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
42
43 /* MIPS specific cache operations */
44 void (*flush_cache_sigtramp)(unsigned long addr);
45 void (*local_flush_data_cache_page)(void * addr);
46 void (*flush_data_cache_page)(unsigned long addr);
47 void (*flush_icache_all)(void);
48
49 EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
50 EXPORT_SYMBOL(flush_data_cache_page);
51
52 #ifdef CONFIG_DMA_NONCOHERENT
53
54 /* DMA cache operations. */
55 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
56 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
57 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
58
59 EXPORT_SYMBOL(_dma_cache_wback_inv);
60
61 #endif /* CONFIG_DMA_NONCOHERENT */
62
63 /*
64 * We could optimize the case where the cache argument is not BCACHE but
65 * that seems very atypical use ...
66 */
SYSCALL_DEFINE3(cacheflush,unsigned long,addr,unsigned long,bytes,unsigned int,cache)67 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
68 unsigned int, cache)
69 {
70 if (bytes == 0)
71 return 0;
72 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
73 return -EFAULT;
74
75 flush_icache_range(addr, addr + bytes);
76
77 return 0;
78 }
79
__flush_dcache_page(struct page * page)80 void __flush_dcache_page(struct page *page)
81 {
82 struct address_space *mapping = page_mapping(page);
83 unsigned long addr;
84
85 if (PageHighMem(page))
86 return;
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 addr = (unsigned long) page_address(page);
98 flush_data_cache_page(addr);
99 }
100
101 EXPORT_SYMBOL(__flush_dcache_page);
102
__flush_anon_page(struct page * page,unsigned long vmaddr)103 void __flush_anon_page(struct page *page, unsigned long vmaddr)
104 {
105 unsigned long addr = (unsigned long) page_address(page);
106
107 if (pages_do_alias(addr, vmaddr)) {
108 if (page_mapped(page) && !Page_dcache_dirty(page)) {
109 void *kaddr;
110
111 kaddr = kmap_coherent(page, vmaddr);
112 flush_data_cache_page((unsigned long)kaddr);
113 kunmap_coherent();
114 } else
115 flush_data_cache_page(addr);
116 }
117 }
118
119 EXPORT_SYMBOL(__flush_anon_page);
120
__update_cache(struct vm_area_struct * vma,unsigned long address,pte_t pte)121 void __update_cache(struct vm_area_struct *vma, unsigned long address,
122 pte_t pte)
123 {
124 struct page *page;
125 unsigned long pfn, addr;
126 int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc;
127
128 pfn = pte_pfn(pte);
129 if (unlikely(!pfn_valid(pfn)))
130 return;
131 page = pfn_to_page(pfn);
132 if (page_mapping(page) && Page_dcache_dirty(page)) {
133 addr = (unsigned long) page_address(page);
134 if (exec || pages_do_alias(addr, address & PAGE_MASK))
135 flush_data_cache_page(addr);
136 ClearPageDcacheDirty(page);
137 }
138 }
139
140 unsigned long _page_cachable_default;
141 EXPORT_SYMBOL(_page_cachable_default);
142
setup_protection_map(void)143 static inline void setup_protection_map(void)
144 {
145 if (kernel_uses_smartmips_rixi) {
146 protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
147 protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
148 protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
149 protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
150 protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
151 protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
152 protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
153 protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
154
155 protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
156 protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
157 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
158 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
159 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
160 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
161 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE | _PAGE_NO_READ);
162 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
163
164 } else {
165 protection_map[0] = PAGE_NONE;
166 protection_map[1] = PAGE_READONLY;
167 protection_map[2] = PAGE_COPY;
168 protection_map[3] = PAGE_COPY;
169 protection_map[4] = PAGE_READONLY;
170 protection_map[5] = PAGE_READONLY;
171 protection_map[6] = PAGE_COPY;
172 protection_map[7] = PAGE_COPY;
173 protection_map[8] = PAGE_NONE;
174 protection_map[9] = PAGE_READONLY;
175 protection_map[10] = PAGE_SHARED;
176 protection_map[11] = PAGE_SHARED;
177 protection_map[12] = PAGE_READONLY;
178 protection_map[13] = PAGE_READONLY;
179 protection_map[14] = PAGE_SHARED;
180 protection_map[15] = PAGE_SHARED;
181 }
182 }
183
cpu_cache_init(void)184 void __cpuinit cpu_cache_init(void)
185 {
186 if (cpu_has_3k_cache) {
187 extern void __weak r3k_cache_init(void);
188
189 r3k_cache_init();
190 }
191 if (cpu_has_6k_cache) {
192 extern void __weak r6k_cache_init(void);
193
194 r6k_cache_init();
195 }
196 if (cpu_has_4k_cache) {
197 extern void __weak r4k_cache_init(void);
198
199 r4k_cache_init();
200 }
201 if (cpu_has_8k_cache) {
202 extern void __weak r8k_cache_init(void);
203
204 r8k_cache_init();
205 }
206 if (cpu_has_tx39_cache) {
207 extern void __weak tx39_cache_init(void);
208
209 tx39_cache_init();
210 }
211
212 if (cpu_has_octeon_cache) {
213 extern void __weak octeon_cache_init(void);
214
215 octeon_cache_init();
216 }
217
218 setup_protection_map();
219 }
220
__uncached_access(struct file * file,unsigned long addr)221 int __weak __uncached_access(struct file *file, unsigned long addr)
222 {
223 if (file->f_flags & O_DSYNC)
224 return 1;
225
226 return addr >= __pa(high_memory);
227 }
228