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1 /* highmem.c: arch-specific highmem stuff
2  *
3  * Copyright (C) 2004 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 License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11 #include <linux/highmem.h>
12 #include <linux/module.h>
13
14 void *kmap(struct page *page)
15 {
16         might_sleep();
17         if (!PageHighMem(page))
18                 return page_address(page);
19         return kmap_high(page);
20 }
21
22 EXPORT_SYMBOL(kmap);
23
24 void kunmap(struct page *page)
25 {
26         if (in_interrupt())
27                 BUG();
28         if (!PageHighMem(page))
29                 return;
30         kunmap_high(page);
31 }
32
33 EXPORT_SYMBOL(kunmap);
34
35 struct page *kmap_atomic_to_page(void *ptr)
36 {
37         return virt_to_page(ptr);
38 }
39
40
41 EXPORT_SYMBOL(kmap_atomic_to_page);