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
6 * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
7 * Copyright (C) 2007 MIPS Technologies, Inc.
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>
18 #include <asm/cacheflush.h>
19 #include <asm/highmem.h>
20 #include <asm/processor.h>
22 #include <asm/cpu-features.h>
24 /* Cache operations. */
25 void (*flush_cache_all)(void);
26 void (*__flush_cache_all)(void);
27 EXPORT_SYMBOL_GPL(__flush_cache_all);
28 void (*flush_cache_mm)(struct mm_struct *mm);
29 void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
31 void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
33 void (*flush_icache_range)(unsigned long start, unsigned long end);
34 EXPORT_SYMBOL_GPL(flush_icache_range);
35 void (*local_flush_icache_range)(unsigned long start, unsigned long end);
36 EXPORT_SYMBOL_GPL(local_flush_icache_range);
37 void (*__flush_icache_user_range)(unsigned long start, unsigned long end);
38 EXPORT_SYMBOL_GPL(__flush_icache_user_range);
39 void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end);
40 EXPORT_SYMBOL_GPL(__local_flush_icache_user_range);
42 void (*__flush_cache_vmap)(void);
43 void (*__flush_cache_vunmap)(void);
45 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
46 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
47 void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
49 /* MIPS specific cache operations */
50 void (*flush_cache_sigtramp)(unsigned long addr);
51 void (*local_flush_data_cache_page)(void * addr);
52 void (*flush_data_cache_page)(unsigned long addr);
53 void (*flush_icache_all)(void);
55 EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
56 EXPORT_SYMBOL(flush_data_cache_page);
57 EXPORT_SYMBOL(flush_icache_all);
59 #if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
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);
66 EXPORT_SYMBOL(_dma_cache_wback_inv);
68 #endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */
71 * We could optimize the case where the cache argument is not BCACHE but
72 * that seems very atypical use ...
74 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
79 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
82 __flush_icache_user_range(addr, addr + bytes);
87 void __flush_dcache_page(struct page *page)
89 struct address_space *mapping = page_mapping(page);
92 if (mapping && !mapping_mapped(mapping)) {
93 SetPageDcacheDirty(page);
98 * We could delay the flush for the !page_mapping case too. But that
99 * case is for exec env/arg pages and those are %99 certainly going to
100 * get faulted into the tlb (and thus flushed) anyways.
102 if (PageHighMem(page))
103 addr = (unsigned long)kmap_atomic(page);
105 addr = (unsigned long)page_address(page);
107 flush_data_cache_page(addr);
109 if (PageHighMem(page))
110 __kunmap_atomic((void *)addr);
113 EXPORT_SYMBOL(__flush_dcache_page);
115 void __flush_anon_page(struct page *page, unsigned long vmaddr)
117 unsigned long addr = (unsigned long) page_address(page);
119 if (pages_do_alias(addr, vmaddr)) {
120 if (page_mapcount(page) && !Page_dcache_dirty(page)) {
123 kaddr = kmap_coherent(page, vmaddr);
124 flush_data_cache_page((unsigned long)kaddr);
127 flush_data_cache_page(addr);
131 EXPORT_SYMBOL(__flush_anon_page);
133 void __update_cache(unsigned long address, pte_t pte)
136 unsigned long pfn, addr;
137 int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
140 if (unlikely(!pfn_valid(pfn)))
142 page = pfn_to_page(pfn);
143 if (Page_dcache_dirty(page)) {
144 if (PageHighMem(page))
145 addr = (unsigned long)kmap_atomic(page);
147 addr = (unsigned long)page_address(page);
149 if (exec || pages_do_alias(addr, address & PAGE_MASK))
150 flush_data_cache_page(addr);
152 if (PageHighMem(page))
153 __kunmap_atomic((void *)addr);
155 ClearPageDcacheDirty(page);
159 unsigned long _page_cachable_default;
160 EXPORT_SYMBOL(_page_cachable_default);
162 static inline void setup_protection_map(void)
165 protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
166 protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
167 protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
168 protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
169 protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
170 protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
171 protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
172 protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
174 protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
175 protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
176 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
177 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
178 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
179 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
180 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
181 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
184 protection_map[0] = PAGE_NONE;
185 protection_map[1] = PAGE_READONLY;
186 protection_map[2] = PAGE_COPY;
187 protection_map[3] = PAGE_COPY;
188 protection_map[4] = PAGE_READONLY;
189 protection_map[5] = PAGE_READONLY;
190 protection_map[6] = PAGE_COPY;
191 protection_map[7] = PAGE_COPY;
192 protection_map[8] = PAGE_NONE;
193 protection_map[9] = PAGE_READONLY;
194 protection_map[10] = PAGE_SHARED;
195 protection_map[11] = PAGE_SHARED;
196 protection_map[12] = PAGE_READONLY;
197 protection_map[13] = PAGE_READONLY;
198 protection_map[14] = PAGE_SHARED;
199 protection_map[15] = PAGE_SHARED;
203 void cpu_cache_init(void)
205 if (cpu_has_3k_cache) {
206 extern void __weak r3k_cache_init(void);
210 if (cpu_has_6k_cache) {
211 extern void __weak r6k_cache_init(void);
215 if (cpu_has_4k_cache) {
216 extern void __weak r4k_cache_init(void);
220 if (cpu_has_8k_cache) {
221 extern void __weak r8k_cache_init(void);
225 if (cpu_has_tx39_cache) {
226 extern void __weak tx39_cache_init(void);
231 if (cpu_has_octeon_cache) {
232 extern void __weak octeon_cache_init(void);
237 setup_protection_map();
240 int __weak __uncached_access(struct file *file, unsigned long addr)
242 if (file->f_flags & O_DSYNC)
245 return addr >= __pa(high_memory);