diff options
Diffstat (limited to 'include/asm-um/fixmap.h')
-rw-r--r-- | include/asm-um/fixmap.h | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/include/asm-um/fixmap.h b/include/asm-um/fixmap.h deleted file mode 100644 index 9d2be52b8655..000000000000 --- a/include/asm-um/fixmap.h +++ /dev/null | |||
@@ -1,98 +0,0 @@ | |||
1 | #ifndef __UM_FIXMAP_H | ||
2 | #define __UM_FIXMAP_H | ||
3 | |||
4 | #include <asm/processor.h> | ||
5 | #include <asm/system.h> | ||
6 | #include <asm/kmap_types.h> | ||
7 | #include <asm/archparam.h> | ||
8 | #include <asm/page.h> | ||
9 | |||
10 | /* | ||
11 | * Here we define all the compile-time 'special' virtual | ||
12 | * addresses. The point is to have a constant address at | ||
13 | * compile time, but to set the physical address only | ||
14 | * in the boot process. We allocate these special addresses | ||
15 | * from the end of virtual memory (0xfffff000) backwards. | ||
16 | * Also this lets us do fail-safe vmalloc(), we | ||
17 | * can guarantee that these special addresses and | ||
18 | * vmalloc()-ed addresses never overlap. | ||
19 | * | ||
20 | * these 'compile-time allocated' memory buffers are | ||
21 | * fixed-size 4k pages. (or larger if used with an increment | ||
22 | * highger than 1) use fixmap_set(idx,phys) to associate | ||
23 | * physical memory with fixmap indices. | ||
24 | * | ||
25 | * TLB entries of such buffers will not be flushed across | ||
26 | * task switches. | ||
27 | */ | ||
28 | |||
29 | /* | ||
30 | * on UP currently we will have no trace of the fixmap mechanizm, | ||
31 | * no page table allocations, etc. This might change in the | ||
32 | * future, say framebuffers for the console driver(s) could be | ||
33 | * fix-mapped? | ||
34 | */ | ||
35 | enum fixed_addresses { | ||
36 | #ifdef CONFIG_HIGHMEM | ||
37 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ | ||
38 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | ||
39 | #endif | ||
40 | __end_of_fixed_addresses | ||
41 | }; | ||
42 | |||
43 | extern void __set_fixmap (enum fixed_addresses idx, | ||
44 | unsigned long phys, pgprot_t flags); | ||
45 | |||
46 | #define set_fixmap(idx, phys) \ | ||
47 | __set_fixmap(idx, phys, PAGE_KERNEL) | ||
48 | /* | ||
49 | * Some hardware wants to get fixmapped without caching. | ||
50 | */ | ||
51 | #define set_fixmap_nocache(idx, phys) \ | ||
52 | __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) | ||
53 | /* | ||
54 | * used by vmalloc.c. | ||
55 | * | ||
56 | * Leave one empty page between vmalloc'ed areas and | ||
57 | * the start of the fixmap, and leave one page empty | ||
58 | * at the top of mem.. | ||
59 | */ | ||
60 | |||
61 | #define FIXADDR_TOP (TASK_SIZE - 2 * PAGE_SIZE) | ||
62 | #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) | ||
63 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) | ||
64 | |||
65 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) | ||
66 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | ||
67 | |||
68 | extern void __this_fixmap_does_not_exist(void); | ||
69 | |||
70 | /* | ||
71 | * 'index to address' translation. If anyone tries to use the idx | ||
72 | * directly without tranlation, we catch the bug with a NULL-deference | ||
73 | * kernel oops. Illegal ranges of incoming indices are caught too. | ||
74 | */ | ||
75 | static inline unsigned long fix_to_virt(const unsigned int idx) | ||
76 | { | ||
77 | /* | ||
78 | * this branch gets completely eliminated after inlining, | ||
79 | * except when someone tries to use fixaddr indices in an | ||
80 | * illegal way. (such as mixing up address types or using | ||
81 | * out-of-range indices). | ||
82 | * | ||
83 | * If it doesn't get removed, the linker will complain | ||
84 | * loudly with a reasonably clear error message.. | ||
85 | */ | ||
86 | if (idx >= __end_of_fixed_addresses) | ||
87 | __this_fixmap_does_not_exist(); | ||
88 | |||
89 | return __fix_to_virt(idx); | ||
90 | } | ||
91 | |||
92 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | ||
93 | { | ||
94 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | ||
95 | return __virt_to_fix(vaddr); | ||
96 | } | ||
97 | |||
98 | #endif | ||