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 #include <linux/highmem.h>
18 #include <linux/pagemap.h>
19
20 #include <asm/cacheflush.h>
21 #include <asm/processor.h>
22 #include <asm/cpu.h>
23 #include <asm/cpu-features.h>
24 #include <asm/setup.h>
25 #include <asm/pgtable.h>
26
27 /* Cache operations. */
28 void (*flush_cache_all)(void);
29 void (*__flush_cache_all)(void);
30 EXPORT_SYMBOL_GPL(__flush_cache_all);
31 void (*flush_cache_mm)(struct mm_struct *mm);
32 void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
33 unsigned long end);
34 void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
35 unsigned long pfn);
36 void (*flush_icache_range)(unsigned long start, unsigned long end);
37 EXPORT_SYMBOL_GPL(flush_icache_range);
38 void (*local_flush_icache_range)(unsigned long start, unsigned long end);
39 EXPORT_SYMBOL_GPL(local_flush_icache_range);
40 void (*__flush_icache_user_range)(unsigned long start, unsigned long end);
41 void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end);
42 EXPORT_SYMBOL_GPL(__local_flush_icache_user_range);
43
44 void (*__flush_cache_vmap)(void);
45 void (*__flush_cache_vunmap)(void);
46
47 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
48 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
49
50 /* MIPS specific cache operations */
51 void (*local_flush_data_cache_page)(void * addr);
52 void (*flush_data_cache_page)(unsigned long addr);
53 void (*flush_icache_all)(void);
54
55 EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
56 EXPORT_SYMBOL(flush_data_cache_page);
57 EXPORT_SYMBOL(flush_icache_all);
58
59 #ifdef CONFIG_DMA_NONCOHERENT
60
61 /* DMA cache operations. */
62 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
63 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
64 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
65
66 #endif /* CONFIG_DMA_NONCOHERENT */
67
68 /*
69 * We could optimize the case where the cache argument is not BCACHE but
70 * that seems very atypical use ...
71 */
SYSCALL_DEFINE3(cacheflush,unsigned long,addr,unsigned long,bytes,unsigned int,cache)72 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
73 unsigned int, cache)
74 {
75 if (bytes == 0)
76 return 0;
77 if (!access_ok((void __user *) addr, bytes))
78 return -EFAULT;
79
80 __flush_icache_user_range(addr, addr + bytes);
81
82 return 0;
83 }
84
__flush_dcache_page(struct page * page)85 void __flush_dcache_page(struct page *page)
86 {
87 struct address_space *mapping = page_mapping_file(page);
88 unsigned long addr;
89
90 if (mapping && !mapping_mapped(mapping)) {
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 = (unsigned long)kmap_atomic(page);
102 else
103 addr = (unsigned long)page_address(page);
104
105 flush_data_cache_page(addr);
106
107 if (PageHighMem(page))
108 kunmap_atomic((void *)addr);
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 unsigned long addr = (unsigned long) page_address(page);
116
117 if (pages_do_alias(addr, vmaddr)) {
118 if (page_mapcount(page) && !Page_dcache_dirty(page)) {
119 void *kaddr;
120
121 kaddr = kmap_coherent(page, vmaddr);
122 flush_data_cache_page((unsigned long)kaddr);
123 kunmap_coherent();
124 } else
125 flush_data_cache_page(addr);
126 }
127 }
128
129 EXPORT_SYMBOL(__flush_anon_page);
130
__update_cache(unsigned long address,pte_t pte)131 void __update_cache(unsigned long address, pte_t pte)
132 {
133 struct page *page;
134 unsigned long pfn, addr;
135 int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
136
137 pfn = pte_pfn(pte);
138 if (unlikely(!pfn_valid(pfn)))
139 return;
140 page = pfn_to_page(pfn);
141 if (Page_dcache_dirty(page)) {
142 if (PageHighMem(page))
143 addr = (unsigned long)kmap_atomic(page);
144 else
145 addr = (unsigned long)page_address(page);
146
147 if (exec || pages_do_alias(addr, address & PAGE_MASK))
148 flush_data_cache_page(addr);
149
150 if (PageHighMem(page))
151 kunmap_atomic((void *)addr);
152
153 ClearPageDcacheDirty(page);
154 }
155 }
156
157 unsigned long _page_cachable_default;
158 EXPORT_SYMBOL(_page_cachable_default);
159
160 #define PM(p) __pgprot(_page_cachable_default | (p))
161
162 static pgprot_t protection_map[16] __ro_after_init;
163 DECLARE_VM_GET_PAGE_PROT
164
setup_protection_map(void)165 static inline void setup_protection_map(void)
166 {
167 protection_map[0] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
168 protection_map[1] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
169 protection_map[2] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
170 protection_map[3] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
171 protection_map[4] = PM(_PAGE_PRESENT);
172 protection_map[5] = PM(_PAGE_PRESENT);
173 protection_map[6] = PM(_PAGE_PRESENT);
174 protection_map[7] = PM(_PAGE_PRESENT);
175
176 protection_map[8] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
177 protection_map[9] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
178 protection_map[10] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE |
179 _PAGE_NO_READ);
180 protection_map[11] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
181 protection_map[12] = PM(_PAGE_PRESENT);
182 protection_map[13] = PM(_PAGE_PRESENT);
183 protection_map[14] = PM(_PAGE_PRESENT | _PAGE_WRITE);
184 protection_map[15] = PM(_PAGE_PRESENT | _PAGE_WRITE);
185 }
186
187 #undef PM
188
cpu_cache_init(void)189 void cpu_cache_init(void)
190 {
191 if (cpu_has_3k_cache) {
192 extern void __weak r3k_cache_init(void);
193
194 r3k_cache_init();
195 }
196 if (cpu_has_4k_cache) {
197 extern void __weak r4k_cache_init(void);
198
199 r4k_cache_init();
200 }
201
202 if (cpu_has_octeon_cache) {
203 extern void __weak octeon_cache_init(void);
204
205 octeon_cache_init();
206 }
207
208 setup_protection_map();
209 }
210