Commit | Line | Data |
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d57c33c5 MS |
1 | /* |
2 | * fixmap.h: compile-time virtual memory allocation | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | * | |
8 | * Copyright (C) 1998 Ingo Molnar | |
9 | * | |
10 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
11 | * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009 | |
12 | * Break out common bits to asm-generic by Mark Salter, November 2013 | |
13 | */ | |
14 | ||
15 | #ifndef __ASM_GENERIC_FIXMAP_H | |
16 | #define __ASM_GENERIC_FIXMAP_H | |
17 | ||
18 | #include <linux/bug.h> | |
d1402fc7 | 19 | #include <linux/mm_types.h> |
d57c33c5 MS |
20 | |
21 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) | |
22 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | |
23 | ||
24 | #ifndef __ASSEMBLY__ | |
25 | /* | |
26 | * 'index to address' translation. If anyone tries to use the idx | |
27 | * directly without translation, we catch the bug with a NULL-deference | |
28 | * kernel oops. Illegal ranges of incoming indices are caught too. | |
29 | */ | |
30 | static __always_inline unsigned long fix_to_virt(const unsigned int idx) | |
31 | { | |
32 | BUILD_BUG_ON(idx >= __end_of_fixed_addresses); | |
33 | return __fix_to_virt(idx); | |
34 | } | |
35 | ||
36 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | |
37 | { | |
38 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | |
39 | return __virt_to_fix(vaddr); | |
40 | } | |
41 | ||
42 | /* | |
43 | * Provide some reasonable defaults for page flags. | |
44 | * Not all architectures use all of these different types and some | |
45 | * architectures use different names. | |
46 | */ | |
47 | #ifndef FIXMAP_PAGE_NORMAL | |
48 | #define FIXMAP_PAGE_NORMAL PAGE_KERNEL | |
49 | #endif | |
2592dbbb JG |
50 | #if !defined(FIXMAP_PAGE_RO) && defined(PAGE_KERNEL_RO) |
51 | #define FIXMAP_PAGE_RO PAGE_KERNEL_RO | |
52 | #endif | |
d57c33c5 MS |
53 | #ifndef FIXMAP_PAGE_NOCACHE |
54 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE | |
55 | #endif | |
56 | #ifndef FIXMAP_PAGE_IO | |
57 | #define FIXMAP_PAGE_IO PAGE_KERNEL_IO | |
58 | #endif | |
59 | #ifndef FIXMAP_PAGE_CLEAR | |
60 | #define FIXMAP_PAGE_CLEAR __pgprot(0) | |
61 | #endif | |
62 | ||
63 | #ifndef set_fixmap | |
64 | #define set_fixmap(idx, phys) \ | |
65 | __set_fixmap(idx, phys, FIXMAP_PAGE_NORMAL) | |
66 | #endif | |
67 | ||
68 | #ifndef clear_fixmap | |
69 | #define clear_fixmap(idx) \ | |
70 | __set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR) | |
71 | #endif | |
72 | ||
73 | /* Return a pointer with offset calculated */ | |
3694bd76 MR |
74 | #define __set_fixmap_offset(idx, phys, flags) \ |
75 | ({ \ | |
76 | unsigned long ________addr; \ | |
77 | __set_fixmap(idx, phys, flags); \ | |
78 | ________addr = fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1)); \ | |
79 | ________addr; \ | |
d57c33c5 MS |
80 | }) |
81 | ||
82 | #define set_fixmap_offset(idx, phys) \ | |
83 | __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NORMAL) | |
84 | ||
85 | /* | |
86 | * Some hardware wants to get fixmapped without caching. | |
87 | */ | |
88 | #define set_fixmap_nocache(idx, phys) \ | |
89 | __set_fixmap(idx, phys, FIXMAP_PAGE_NOCACHE) | |
90 | ||
91 | #define set_fixmap_offset_nocache(idx, phys) \ | |
92 | __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NOCACHE) | |
93 | ||
94 | /* | |
95 | * Some fixmaps are for IO | |
96 | */ | |
97 | #define set_fixmap_io(idx, phys) \ | |
98 | __set_fixmap(idx, phys, FIXMAP_PAGE_IO) | |
99 | ||
f774b7d1 MZ |
100 | #define set_fixmap_offset_io(idx, phys) \ |
101 | __set_fixmap_offset(idx, phys, FIXMAP_PAGE_IO) | |
102 | ||
d57c33c5 MS |
103 | #endif /* __ASSEMBLY__ */ |
104 | #endif /* __ASM_GENERIC_FIXMAP_H */ |