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Diffstat (limited to 'include/asm-sh/fixmap.h')
-rw-r--r-- | include/asm-sh/fixmap.h | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/include/asm-sh/fixmap.h b/include/asm-sh/fixmap.h deleted file mode 100644 index 721fcc4d5e98..000000000000 --- a/include/asm-sh/fixmap.h +++ /dev/null | |||
@@ -1,117 +0,0 @@ | |||
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 | */ | ||
12 | |||
13 | #ifndef _ASM_FIXMAP_H | ||
14 | #define _ASM_FIXMAP_H | ||
15 | |||
16 | #include <linux/kernel.h> | ||
17 | #include <asm/page.h> | ||
18 | #ifdef CONFIG_HIGHMEM | ||
19 | #include <linux/threads.h> | ||
20 | #include <asm/kmap_types.h> | ||
21 | #endif | ||
22 | |||
23 | /* | ||
24 | * Here we define all the compile-time 'special' virtual | ||
25 | * addresses. The point is to have a constant address at | ||
26 | * compile time, but to set the physical address only | ||
27 | * in the boot process. We allocate these special addresses | ||
28 | * from the end of P3 backwards. | ||
29 | * Also this lets us do fail-safe vmalloc(), we | ||
30 | * can guarantee that these special addresses and | ||
31 | * vmalloc()-ed addresses never overlap. | ||
32 | * | ||
33 | * these 'compile-time allocated' memory buffers are | ||
34 | * fixed-size 4k pages. (or larger if used with an increment | ||
35 | * highger than 1) use fixmap_set(idx,phys) to associate | ||
36 | * physical memory with fixmap indices. | ||
37 | * | ||
38 | * TLB entries of such buffers will not be flushed across | ||
39 | * task switches. | ||
40 | */ | ||
41 | |||
42 | /* | ||
43 | * on UP currently we will have no trace of the fixmap mechanizm, | ||
44 | * no page table allocations, etc. This might change in the | ||
45 | * future, say framebuffers for the console driver(s) could be | ||
46 | * fix-mapped? | ||
47 | */ | ||
48 | enum fixed_addresses { | ||
49 | #define FIX_N_COLOURS 16 | ||
50 | FIX_CMAP_BEGIN, | ||
51 | FIX_CMAP_END = FIX_CMAP_BEGIN + FIX_N_COLOURS, | ||
52 | FIX_UNCACHED, | ||
53 | #ifdef CONFIG_HIGHMEM | ||
54 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ | ||
55 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | ||
56 | #endif | ||
57 | __end_of_fixed_addresses | ||
58 | }; | ||
59 | |||
60 | extern void __set_fixmap(enum fixed_addresses idx, | ||
61 | unsigned long phys, pgprot_t flags); | ||
62 | |||
63 | #define set_fixmap(idx, phys) \ | ||
64 | __set_fixmap(idx, phys, PAGE_KERNEL) | ||
65 | /* | ||
66 | * Some hardware wants to get fixmapped without caching. | ||
67 | */ | ||
68 | #define set_fixmap_nocache(idx, phys) \ | ||
69 | __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) | ||
70 | /* | ||
71 | * used by vmalloc.c. | ||
72 | * | ||
73 | * Leave one empty page between vmalloc'ed areas and | ||
74 | * the start of the fixmap, and leave one page empty | ||
75 | * at the top of mem.. | ||
76 | */ | ||
77 | #ifdef CONFIG_SUPERH32 | ||
78 | #define FIXADDR_TOP (P4SEG - PAGE_SIZE) | ||
79 | #else | ||
80 | #define FIXADDR_TOP (0xff000000 - PAGE_SIZE) | ||
81 | #endif | ||
82 | #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) | ||
83 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) | ||
84 | |||
85 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) | ||
86 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | ||
87 | |||
88 | extern void __this_fixmap_does_not_exist(void); | ||
89 | |||
90 | /* | ||
91 | * 'index to address' translation. If anyone tries to use the idx | ||
92 | * directly without tranlation, we catch the bug with a NULL-deference | ||
93 | * kernel oops. Illegal ranges of incoming indices are caught too. | ||
94 | */ | ||
95 | static inline unsigned long fix_to_virt(const unsigned int idx) | ||
96 | { | ||
97 | /* | ||
98 | * this branch gets completely eliminated after inlining, | ||
99 | * except when someone tries to use fixaddr indices in an | ||
100 | * illegal way. (such as mixing up address types or using | ||
101 | * out-of-range indices). | ||
102 | * | ||
103 | * If it doesn't get removed, the linker will complain | ||
104 | * loudly with a reasonably clear error message.. | ||
105 | */ | ||
106 | if (idx >= __end_of_fixed_addresses) | ||
107 | __this_fixmap_does_not_exist(); | ||
108 | |||
109 | return __fix_to_virt(idx); | ||
110 | } | ||
111 | |||
112 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | ||
113 | { | ||
114 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | ||
115 | return __virt_to_fix(vaddr); | ||
116 | } | ||
117 | #endif | ||