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