blob: 694d51f523d1fd8d5cbf057534e6031bf36f5327 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Ralf Baechle641e97f2007-10-11 23:46:05 +01006 * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
Ralf Baechle7575a492007-03-23 21:36:37 +00007 * Copyright (C) 2007 MIPS Technologies, Inc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 */
Ralf Baechle24e9d0b962007-07-10 17:32:56 +01009#include <linux/fs.h>
10#include <linux/fcntl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/init.h>
12#include <linux/kernel.h>
Ralf Baechle641e97f2007-10-11 23:46:05 +010013#include <linux/linkage.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/module.h>
15#include <linux/sched.h>
Ralf Baechledbda6ac2009-02-08 16:00:26 +000016#include <linux/syscalls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#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. */
25void (*flush_cache_all)(void);
26void (*__flush_cache_all)(void);
27void (*flush_cache_mm)(struct mm_struct *mm);
28void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
29 unsigned long end);
Ralf Baechle53de0d42005-03-18 17:36:42 +000030void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
31 unsigned long pfn);
Atsushi Nemotod4264f12006-01-29 02:27:51 +090032void (*flush_icache_range)(unsigned long start, unsigned long end);
Thomas Bogendoerfere0cee3e2008-08-04 20:53:57 +020033void (*local_flush_icache_range)(unsigned long start, unsigned long end);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Ralf Baechle9c5a3d72008-04-05 15:13:23 +010035void (*__flush_cache_vmap)(void);
36void (*__flush_cache_vunmap)(void);
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038/* MIPS specific cache operations */
39void (*flush_cache_sigtramp)(unsigned long addr);
Ralf Baechle7e3bfc72006-04-05 20:42:04 +010040void (*local_flush_data_cache_page)(void * addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041void (*flush_data_cache_page)(unsigned long addr);
42void (*flush_icache_all)(void);
43
Ralf Baechle9202f322006-12-10 18:43:59 +000044EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
Ralf Baechle9ff77c42005-03-08 14:39:39 +000045EXPORT_SYMBOL(flush_data_cache_page);
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#ifdef CONFIG_DMA_NONCOHERENT
48
49/* DMA cache operations. */
50void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
51void (*_dma_cache_wback)(unsigned long start, unsigned long size);
52void (*_dma_cache_inv)(unsigned long start, unsigned long size);
53
54EXPORT_SYMBOL(_dma_cache_wback_inv);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
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 */
Ralf Baechledbda6ac2009-02-08 16:00:26 +000062SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
63 unsigned int, cache)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
Atsushi Nemoto750ccf62005-10-19 19:57:14 +090065 if (bytes == 0)
66 return 0;
Ralf Baechlefe00f942005-03-01 19:22:29 +000067 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 return -EFAULT;
69
70 flush_icache_range(addr, addr + bytes);
71
72 return 0;
73}
74
75void __flush_dcache_page(struct page *page)
76{
77 struct address_space *mapping = page_mapping(page);
78 unsigned long addr;
79
Ralf Baechle585fa722006-08-12 16:40:08 +010080 if (PageHighMem(page))
81 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 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
96EXPORT_SYMBOL(__flush_dcache_page);
97
Ralf Baechle7575a492007-03-23 21:36:37 +000098void __flush_anon_page(struct page *page, unsigned long vmaddr)
99{
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000100 unsigned long addr = (unsigned long) page_address(page);
Ralf Baechle7575a492007-03-23 21:36:37 +0000101
Ralf Baechle9a74b3e2008-02-16 22:34:25 +0000102 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);
Ralf Baechle7575a492007-03-23 21:36:37 +0000111 }
112}
113
114EXPORT_SYMBOL(__flush_anon_page);
115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116void __update_cache(struct vm_area_struct *vma, unsigned long address,
117 pte_t pte)
118{
119 struct page *page;
120 unsigned long pfn, addr;
Ralf Baechle585fa722006-08-12 16:40:08 +0100121 int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123 pfn = pte_pfn(pte);
Ralf Baechle585fa722006-08-12 16:40:08 +0100124 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))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 flush_data_cache_page(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 ClearPageDcacheDirty(page);
132 }
133}
134
Chris Dearman35133692007-09-19 00:58:24 +0100135unsigned long _page_cachable_default;
136EXPORT_SYMBOL_GPL(_page_cachable_default);
137
138static inline void setup_protection_map(void)
139{
140 protection_map[0] = PAGE_NONE;
141 protection_map[1] = PAGE_READONLY;
142 protection_map[2] = PAGE_COPY;
143 protection_map[3] = PAGE_COPY;
144 protection_map[4] = PAGE_READONLY;
145 protection_map[5] = PAGE_READONLY;
146 protection_map[6] = PAGE_COPY;
147 protection_map[7] = PAGE_COPY;
148 protection_map[8] = PAGE_NONE;
149 protection_map[9] = PAGE_READONLY;
150 protection_map[10] = PAGE_SHARED;
151 protection_map[11] = PAGE_SHARED;
152 protection_map[12] = PAGE_READONLY;
153 protection_map[13] = PAGE_READONLY;
154 protection_map[14] = PAGE_SHARED;
155 protection_map[15] = PAGE_SHARED;
156}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Ralf Baechle234fcd12008-03-08 09:56:28 +0000158void __devinit cpu_cache_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
Ralf Baechle02cf2112005-10-01 13:06:32 +0100160 if (cpu_has_3k_cache) {
161 extern void __weak r3k_cache_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Ralf Baechle02cf2112005-10-01 13:06:32 +0100163 r3k_cache_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
Ralf Baechle02cf2112005-10-01 13:06:32 +0100165 if (cpu_has_6k_cache) {
166 extern void __weak r6k_cache_init(void);
167
168 r6k_cache_init();
Ralf Baechle02cf2112005-10-01 13:06:32 +0100169 }
170 if (cpu_has_4k_cache) {
171 extern void __weak r4k_cache_init(void);
172
173 r4k_cache_init();
Ralf Baechle02cf2112005-10-01 13:06:32 +0100174 }
175 if (cpu_has_8k_cache) {
176 extern void __weak r8k_cache_init(void);
177
178 r8k_cache_init();
Ralf Baechle02cf2112005-10-01 13:06:32 +0100179 }
180 if (cpu_has_tx39_cache) {
181 extern void __weak tx39_cache_init(void);
182
183 tx39_cache_init();
Ralf Baechle02cf2112005-10-01 13:06:32 +0100184 }
Ralf Baechle02cf2112005-10-01 13:06:32 +0100185
David Daney47d979e2008-12-11 15:33:27 -0800186 if (cpu_has_octeon_cache) {
187 extern void __weak octeon_cache_init(void);
188
189 octeon_cache_init();
190 }
191
Chris Dearman35133692007-09-19 00:58:24 +0100192 setup_protection_map();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
Ralf Baechle24e9d0b962007-07-10 17:32:56 +0100194
195int __weak __uncached_access(struct file *file, unsigned long addr)
196{
197 if (file->f_flags & O_SYNC)
198 return 1;
199
200 return addr >= __pa(high_memory);
201}