diff options
author | Sam Ravnborg <sam@ravnborg.org> | 2012-07-26 07:02:18 -0400 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2012-07-26 19:46:16 -0400 |
commit | c00db32122e17120eb87d0f1f6723c1c4740fa78 (patch) | |
tree | 1bcb03dd6e5650eeddd308a3e513498dd981228c | |
parent | 5bbeed12bdc3eaebe963cda2bf8039c37cbe2235 (diff) |
sparc32: fixmap.h cleanup
Remove all unused stuff from fixmap.h
It is only used for highmem - sparc32 has no fixmap support.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r-- | arch/sparc/include/asm/fixmap.h | 94 |
1 files changed, 5 insertions, 89 deletions
diff --git a/arch/sparc/include/asm/fixmap.h b/arch/sparc/include/asm/fixmap.h index f18fc0755adf..0bdec9385a80 100644 --- a/arch/sparc/include/asm/fixmap.h +++ b/arch/sparc/include/asm/fixmap.h | |||
@@ -1,110 +1,26 @@ | |||
1 | /* | 1 | /* Highmem related constants */ |
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 | 2 | ||
13 | #ifndef _ASM_FIXMAP_H | 3 | #ifndef _ASM_FIXMAP_H |
14 | #define _ASM_FIXMAP_H | 4 | #define _ASM_FIXMAP_H |
15 | 5 | ||
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> | 6 | #include <asm/kmap_types.h> |
21 | #endif | ||
22 | 7 | ||
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 top of unused virtual memory (0xfd000000 - 1 page) 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 mechanism, | ||
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 { | 8 | enum fixed_addresses { |
49 | FIX_HOLE, | 9 | FIX_HOLE, |
50 | #ifdef CONFIG_HIGHMEM | 10 | #ifdef CONFIG_HIGHMEM |
51 | FIX_KMAP_BEGIN, | 11 | FIX_KMAP_BEGIN, |
52 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | 12 | FIX_KMAP_END = (KM_TYPE_NR * NR_CPUS), |
53 | #endif | 13 | #endif |
54 | __end_of_fixed_addresses | 14 | __end_of_fixed_addresses |
55 | }; | 15 | }; |
56 | 16 | ||
57 | extern void __set_fixmap (enum fixed_addresses idx, | 17 | /* Leave one empty page between IO pages at 0xfd000000 and |
58 | unsigned long phys, pgprot_t flags); | 18 | * the top of the fixmap. |
59 | |||
60 | #define set_fixmap(idx, phys) \ | ||
61 | __set_fixmap(idx, phys, PAGE_KERNEL) | ||
62 | /* | ||
63 | * Some hardware wants to get fixmapped without caching. | ||
64 | */ | ||
65 | #define set_fixmap_nocache(idx, phys) \ | ||
66 | __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) | ||
67 | /* | ||
68 | * used by vmalloc.c. | ||
69 | * | ||
70 | * Leave one empty page between IO pages at 0xfd000000 and | ||
71 | * the start of the fixmap. | ||
72 | */ | 19 | */ |
73 | #define FIXADDR_TOP (0xfcfff000UL) | 20 | #define FIXADDR_TOP (0xfcfff000UL) |
74 | #define FIXADDR_SIZE ((__end_of_fixed_addresses) << PAGE_SHIFT) | 21 | #define FIXADDR_SIZE ((FIX_KMAP_END + 1) << PAGE_SHIFT) |
75 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) | 22 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
76 | 23 | ||
77 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) | 24 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) |
78 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | ||
79 | |||
80 | extern void __this_fixmap_does_not_exist(void); | ||
81 | |||
82 | /* | ||
83 | * 'index to address' translation. If anyone tries to use the idx | ||
84 | * directly without tranlation, we catch the bug with a NULL-deference | ||
85 | * kernel oops. Illegal ranges of incoming indices are caught too. | ||
86 | */ | ||
87 | static inline unsigned long fix_to_virt(const unsigned int idx) | ||
88 | { | ||
89 | /* | ||
90 | * this branch gets completely eliminated after inlining, | ||
91 | * except when someone tries to use fixaddr indices in an | ||
92 | * illegal way. (such as mixing up address types or using | ||
93 | * out-of-range indices). | ||
94 | * | ||
95 | * If it doesn't get removed, the linker will complain | ||
96 | * loudly with a reasonably clear error message.. | ||
97 | */ | ||
98 | if (idx >= __end_of_fixed_addresses) | ||
99 | __this_fixmap_does_not_exist(); | ||
100 | |||
101 | return __fix_to_virt(idx); | ||
102 | } | ||
103 | |||
104 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | ||
105 | { | ||
106 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | ||
107 | return __virt_to_fix(vaddr); | ||
108 | } | ||
109 | 25 | ||
110 | #endif | 26 | #endif |