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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> | |
19 | ||
20 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) | |
21 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | |
22 | ||
23 | #ifndef __ASSEMBLY__ | |
24 | /* | |
25 | * 'index to address' translation. If anyone tries to use the idx | |
26 | * directly without translation, we catch the bug with a NULL-deference | |
27 | * kernel oops. Illegal ranges of incoming indices are caught too. | |
28 | */ | |
29 | static __always_inline unsigned long fix_to_virt(const unsigned int idx) | |
30 | { | |
31 | BUILD_BUG_ON(idx >= __end_of_fixed_addresses); | |
32 | return __fix_to_virt(idx); | |
33 | } | |
34 | ||
35 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | |
36 | { | |
37 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | |
38 | return __virt_to_fix(vaddr); | |
39 | } | |
40 | ||
41 | /* | |
42 | * Provide some reasonable defaults for page flags. | |
43 | * Not all architectures use all of these different types and some | |
44 | * architectures use different names. | |
45 | */ | |
46 | #ifndef FIXMAP_PAGE_NORMAL | |
47 | #define FIXMAP_PAGE_NORMAL PAGE_KERNEL | |
48 | #endif | |
49 | #ifndef FIXMAP_PAGE_NOCACHE | |
50 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE | |
51 | #endif | |
52 | #ifndef FIXMAP_PAGE_IO | |
53 | #define FIXMAP_PAGE_IO PAGE_KERNEL_IO | |
54 | #endif | |
55 | #ifndef FIXMAP_PAGE_CLEAR | |
56 | #define FIXMAP_PAGE_CLEAR __pgprot(0) | |
57 | #endif | |
58 | ||
59 | #ifndef set_fixmap | |
60 | #define set_fixmap(idx, phys) \ | |
61 | __set_fixmap(idx, phys, FIXMAP_PAGE_NORMAL) | |
62 | #endif | |
63 | ||
64 | #ifndef clear_fixmap | |
65 | #define clear_fixmap(idx) \ | |
66 | __set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR) | |
67 | #endif | |
68 | ||
69 | /* Return a pointer with offset calculated */ | |
70 | #define __set_fixmap_offset(idx, phys, flags) \ | |
71 | ({ \ | |
72 | unsigned long addr; \ | |
73 | __set_fixmap(idx, phys, flags); \ | |
74 | addr = fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1)); \ | |
75 | addr; \ | |
76 | }) | |
77 | ||
78 | #define set_fixmap_offset(idx, phys) \ | |
79 | __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NORMAL) | |
80 | ||
81 | /* | |
82 | * Some hardware wants to get fixmapped without caching. | |
83 | */ | |
84 | #define set_fixmap_nocache(idx, phys) \ | |
85 | __set_fixmap(idx, phys, FIXMAP_PAGE_NOCACHE) | |
86 | ||
87 | #define set_fixmap_offset_nocache(idx, phys) \ | |
88 | __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NOCACHE) | |
89 | ||
90 | /* | |
91 | * Some fixmaps are for IO | |
92 | */ | |
93 | #define set_fixmap_io(idx, phys) \ | |
94 | __set_fixmap(idx, phys, FIXMAP_PAGE_IO) | |
95 | ||
f774b7d1 MZ |
96 | #define set_fixmap_offset_io(idx, phys) \ |
97 | __set_fixmap_offset(idx, phys, FIXMAP_PAGE_IO) | |
98 | ||
d57c33c5 MS |
99 | #endif /* __ASSEMBLY__ */ |
100 | #endif /* __ASM_GENERIC_FIXMAP_H */ |