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/module.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/processor.h>
20#include <asm/cpu.h>
21#include <asm/cpu-features.h>
22
23/* Cache operations. */
24void (*flush_cache_all)(void);
25void (*__flush_cache_all)(void);
26void (*flush_cache_mm)(struct mm_struct *mm);
27void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
28 unsigned long end);
29void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
30 unsigned long pfn);
31void (*flush_icache_range)(unsigned long start, unsigned long end);
32EXPORT_SYMBOL_GPL(flush_icache_range);
33void (*local_flush_icache_range)(unsigned long start, unsigned long end);
34EXPORT_SYMBOL_GPL(local_flush_icache_range);
35
36void (*__flush_cache_vmap)(void);
37void (*__flush_cache_vunmap)(void);
38
39void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
40EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
41void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
42
43/* MIPS specific cache operations */
44void (*flush_cache_sigtramp)(unsigned long addr);
45void (*local_flush_data_cache_page)(void * addr);
46void (*flush_data_cache_page)(unsigned long addr);
47void (*flush_icache_all)(void);
48
49EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
50EXPORT_SYMBOL(flush_data_cache_page);
51EXPORT_SYMBOL(flush_icache_all);
52
53#if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
54
55/* DMA cache operations. */
56void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
57void (*_dma_cache_wback)(unsigned long start, unsigned long size);
58void (*_dma_cache_inv)(unsigned long start, unsigned long size);
59
60EXPORT_SYMBOL(_dma_cache_wback_inv);
61
62#endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */
63
64/*
65 * We could optimize the case where the cache argument is not BCACHE but
66 * that seems very atypical use ...
67 */
68SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
69 unsigned int, cache)
70{
71 if (bytes == 0)
72 return 0;
73 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
74 return -EFAULT;
75
76 flush_icache_range(addr, addr + bytes);
77
78 return 0;
79}
80
81void __flush_dcache_page(struct page *page)
82{
83 struct address_space *mapping = page_mapping(page);
84 unsigned long addr;
85
86 if (PageHighMem(page))
87 return;
88 if (mapping && !mapping_mapped(mapping)) {
89 SetPageDcacheDirty(page);
90 return;
91 }
92
93 /*
94 * We could delay the flush for the !page_mapping case too. But that
95 * case is for exec env/arg pages and those are %99 certainly going to
96 * get faulted into the tlb (and thus flushed) anyways.
97 */
98 addr = (unsigned long) page_address(page);
99 flush_data_cache_page(addr);
100}
101
102EXPORT_SYMBOL(__flush_dcache_page);
103
104void __flush_anon_page(struct page *page, unsigned long vmaddr)
105{
106 unsigned long addr = (unsigned long) page_address(page);
107
108 if (pages_do_alias(addr, vmaddr)) {
109 if (page_mapped(page) && !Page_dcache_dirty(page)) {
110 void *kaddr;
111
112 kaddr = kmap_coherent(page, vmaddr);
113 flush_data_cache_page((unsigned long)kaddr);
114 kunmap_coherent();
115 } else
116 flush_data_cache_page(addr);
117 }
118}
119
120EXPORT_SYMBOL(__flush_anon_page);
121
122static void mips_flush_dcache_from_pte(pte_t pteval, unsigned long address)
123{
124 struct page *page;
125 unsigned long pfn = pte_pfn(pteval);
126
127 if (unlikely(!pfn_valid(pfn)))
128 return;
129
130 page = pfn_to_page(pfn);
131 if (page_mapping(page) && Page_dcache_dirty(page)) {
132 unsigned long page_addr = (unsigned long) page_address(page);
133
134 if (!cpu_has_ic_fills_f_dc ||
135 pages_do_alias(page_addr, address & PAGE_MASK))
136 flush_data_cache_page(page_addr);
137 ClearPageDcacheDirty(page);
138 }
139}
140
141void set_pte_at(struct mm_struct *mm, unsigned long addr,
142 pte_t *ptep, pte_t pteval)
143{
144 if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc) {
145 if (pte_present(pteval))
146 mips_flush_dcache_from_pte(pteval, addr);
147 }
148
149 set_pte(ptep, pteval);
150}
151
152unsigned long _page_cachable_default;
153EXPORT_SYMBOL(_page_cachable_default);
154
155static inline void setup_protection_map(void)
156{
157 if (cpu_has_rixi) {
158 protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
159 protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
160 protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
161 protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
162 protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
163 protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
164 protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
165 protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
166
167 protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
168 protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
169 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
170 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
171 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
172 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
173 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE | _PAGE_NO_READ);
174 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
175
176 } else {
177 protection_map[0] = PAGE_NONE;
178 protection_map[1] = PAGE_READONLY;
179 protection_map[2] = PAGE_COPY;
180 protection_map[3] = PAGE_COPY;
181 protection_map[4] = PAGE_READONLY;
182 protection_map[5] = PAGE_READONLY;
183 protection_map[6] = PAGE_COPY;
184 protection_map[7] = PAGE_COPY;
185 protection_map[8] = PAGE_NONE;
186 protection_map[9] = PAGE_READONLY;
187 protection_map[10] = PAGE_SHARED;
188 protection_map[11] = PAGE_SHARED;
189 protection_map[12] = PAGE_READONLY;
190 protection_map[13] = PAGE_READONLY;
191 protection_map[14] = PAGE_SHARED;
192 protection_map[15] = PAGE_SHARED;
193 }
194}
195
196void cpu_cache_init(void)
197{
198 if (cpu_has_3k_cache) {
199 extern void __weak r3k_cache_init(void);
200
201 r3k_cache_init();
202 }
203 if (cpu_has_6k_cache) {
204 extern void __weak r6k_cache_init(void);
205
206 r6k_cache_init();
207 }
208 if (cpu_has_4k_cache) {
209 extern void __weak r4k_cache_init(void);
210
211 r4k_cache_init();
212 }
213 if (cpu_has_8k_cache) {
214 extern void __weak r8k_cache_init(void);
215
216 r8k_cache_init();
217 }
218 if (cpu_has_tx39_cache) {
219 extern void __weak tx39_cache_init(void);
220
221 tx39_cache_init();
222 }
223
224 if (cpu_has_octeon_cache) {
225 extern void __weak octeon_cache_init(void);
226
227 octeon_cache_init();
228 }
229
230 setup_protection_map();
231}
232
233int __weak __uncached_access(struct file *file, unsigned long addr)
234{
235 if (file->f_flags & O_DSYNC)
236 return 1;
237
238 return addr >= __pa(high_memory);
239}