1 /* MN10300 Cache flushing routines
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
11 #include <linux/module.h>
13 #include <linux/mman.h>
14 #include <linux/threads.h>
16 #include <asm/pgtable.h>
17 #include <asm/processor.h>
18 #include <asm/cacheflush.h>
20 #include <asm/uaccess.h>
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
);
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
);
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
43 void flush_icache_page(struct vm_area_struct
*vma
, struct page
*page
)
45 mn10300_dcache_flush_page(page_to_phys(page
));
48 EXPORT_SYMBOL(flush_icache_page
);
51 * write some code we've just written back from the dcache and invalidate the
52 * icache so that we can run that code
54 void flush_icache_range(unsigned long start
, unsigned long end
)
56 #ifdef CONFIG_MN10300_CACHE_WBACK
57 unsigned long addr
, size
, base
, off
;
64 if (end
> 0x80000000UL
) {
65 /* addresses above 0xa0000000 do not go through the cache */
66 if (end
> 0xa0000000UL
) {
72 /* kernel addresses between 0x80000000 and 0x9fffffff do not
73 * require page tables, so we just map such addresses directly */
74 base
= (start
>= 0x80000000UL
) ? start
: 0x80000000UL
;
75 mn10300_dcache_flush_range(base
, end
);
81 for (; start
< end
; start
+= size
) {
82 /* work out how much of the page to flush */
83 off
= start
& (PAGE_SIZE
- 1);
86 if (size
> PAGE_SIZE
- off
)
87 size
= PAGE_SIZE
- off
;
89 /* get the physical address the page is mapped to from the page
91 pgd
= pgd_offset(current
->mm
, start
);
92 if (!pgd
|| !pgd_val(*pgd
))
95 pud
= pud_offset(pgd
, start
);
96 if (!pud
|| !pud_val(*pud
))
99 pmd
= pmd_offset(pud
, start
);
100 if (!pmd
|| !pmd_val(*pmd
))
103 ppte
= pte_offset_map(pmd
, start
);
112 page
= pte_page(pte
);
116 addr
= page_to_phys(page
);
118 /* flush the dcache and invalidate the icache coverage on that
120 mn10300_dcache_flush_range2(addr
+ off
, size
);
125 mn10300_icache_inv();
127 EXPORT_SYMBOL(flush_icache_range
);
130 * allow userspace to flush the instruction cache
132 asmlinkage
long sys_cacheflush(unsigned long start
, unsigned long end
)
137 flush_icache_range(start
, end
);