1 /*
2 * Copyright (c) 2014-2020 François Tigeot <ftigeot@wolfpond.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef _LINUX_HIGHMEM_H_
28 #define _LINUX_HIGHMEM_H_
29
30 #include <machine/vmparam.h>
31
32 #include <linux/kernel.h>
33 #include <linux/bug.h>
34 #include <linux/mm.h>
35 #include <linux/uaccess.h>
36 #include <linux/hardirq.h>
37
38 #include <asm/cacheflush.h>
39
40 static inline struct page *
kmap_to_page(void * addr)41 kmap_to_page(void *addr)
42 {
43 if (addr == NULL)
44 return NULL;
45
46 return (struct page *)PHYS_TO_VM_PAGE(vtophys(addr));
47 }
48
kmap(struct page * pg)49 static inline void *kmap(struct page *pg)
50 {
51 return (void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS( (struct vm_page *)pg ));
52 }
53
kunmap(struct page * pg)54 static inline void kunmap(struct page *pg)
55 {
56 /* Nothing to do on systems with a direct memory map */
57 }
58
kmap_atomic(struct page * pg)59 static inline void *kmap_atomic(struct page *pg)
60 {
61 return (void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS( (struct vm_page *)pg ));
62 }
63
64 static inline void *
kmap_atomic_prot(struct page * pg,pgprot_t prot)65 kmap_atomic_prot(struct page *pg, pgprot_t prot)
66 {
67 return kmap_atomic(pg);
68 }
69
kunmap_atomic(void * vaddr)70 static inline void kunmap_atomic(void *vaddr)
71 {
72 /* Nothing to do on systems with a direct memory map */
73 }
74
75 #endif /* _LINUX_HIGHMEM_H_ */
76