sh: migrate to arch/sh/include/
[linux-2.6.git] / arch / mn10300 / mm / cache.c
1 /* MN10300 Cache flushing routines
2  *
3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public Licence
8  * as published by the Free Software Foundation; either version
9  * 2 of the Licence, or (at your option) any later version.
10  */
11 #include <linux/module.h>
12 #include <linux/mm.h>
13 #include <linux/mman.h>
14 #include <linux/threads.h>
15 #include <asm/page.h>
16 #include <asm/pgtable.h>
17 #include <asm/processor.h>
18 #include <asm/cacheflush.h>
19 #include <asm/io.h>
20 #include <asm/uaccess.h>
21
22 EXPORT_SYMBOL(mn10300_icache_inv);
23 EXPORT_SYMBOL(mn10300_dcache_inv);
24 EXPORT_SYMBOL(mn10300_dcache_inv_range);
25 EXPORT_SYMBOL(mn10300_dcache_inv_range2);
26 EXPORT_SYMBOL(mn10300_dcache_inv_page);
27
28 #ifdef CONFIG_MN10300_CACHE_WBACK
29 EXPORT_SYMBOL(mn10300_dcache_flush);
30 EXPORT_SYMBOL(mn10300_dcache_flush_inv);
31 EXPORT_SYMBOL(mn10300_dcache_flush_inv_range);
32 EXPORT_SYMBOL(mn10300_dcache_flush_inv_range2);
33 EXPORT_SYMBOL(mn10300_dcache_flush_inv_page);
34 EXPORT_SYMBOL(mn10300_dcache_flush_range);
35 EXPORT_SYMBOL(mn10300_dcache_flush_range2);
36 EXPORT_SYMBOL(mn10300_dcache_flush_page);
37 #endif
38
39 /*
40  * write a page back from the dcache and invalidate the icache so that we can
41  * run code from it that we've just written into it
42  */
43 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
44 {
45         mn10300_dcache_flush_page(page_to_phys(page));
46         mn10300_icache_inv();
47 }
48 EXPORT_SYMBOL(flush_icache_page);
49
50 /*
51  * write some code we've just written back from the dcache and invalidate the
52  * icache so that we can run that code
53  */
54 void flush_icache_range(unsigned long start, unsigned long end)
55 {
56 #ifdef CONFIG_MN10300_CACHE_WBACK
57         unsigned long addr, size, off;
58         struct page *page;
59         pgd_t *pgd;
60         pud_t *pud;
61         pmd_t *pmd;
62         pte_t *ppte, pte;
63
64         for (; start < end; start += size) {
65                 /* work out how much of the page to flush */
66                 off = start & (PAGE_SIZE - 1);
67
68                 size = end - start;
69                 if (size > PAGE_SIZE - off)
70                         size = PAGE_SIZE - off;
71
72                 /* get the physical address the page is mapped to from the page
73                  * tables */
74                 pgd = pgd_offset(current->mm, start);
75                 if (!pgd || !pgd_val(*pgd))
76                         continue;
77
78                 pud = pud_offset(pgd, start);
79                 if (!pud || !pud_val(*pud))
80                         continue;
81
82                 pmd = pmd_offset(pud, start);
83                 if (!pmd || !pmd_val(*pmd))
84                         continue;
85
86                 ppte = pte_offset_map(pmd, start);
87                 if (!ppte)
88                         continue;
89                 pte = *ppte;
90                 pte_unmap(ppte);
91
92                 if (pte_none(pte))
93                         continue;
94
95                 page = pte_page(pte);
96                 if (!page)
97                         continue;
98
99                 addr = page_to_phys(page);
100
101                 /* flush the dcache and invalidate the icache coverage on that
102                  * region */
103                 mn10300_dcache_flush_range2(addr + off, size);
104         }
105 #endif
106
107         mn10300_icache_inv();
108 }
109 EXPORT_SYMBOL(flush_icache_range);
110
111 /*
112  * allow userspace to flush the instruction cache
113  */
114 asmlinkage long sys_cacheflush(unsigned long start, unsigned long end)
115 {
116         if (end < start)
117                 return -EINVAL;
118
119         flush_icache_range(start, end);
120         return 0;
121 }