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authorSam Ravnborg <sam@ravnborg.org>2012-07-26 07:02:18 -0400
committerDavid S. Miller <davem@davemloft.net>2012-07-26 19:46:16 -0400
commitc00db32122e17120eb87d0f1f6723c1c4740fa78 (patch)
tree1bcb03dd6e5650eeddd308a3e513498dd981228c
parent5bbeed12bdc3eaebe963cda2bf8039c37cbe2235 (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.h94
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 */
48enum fixed_addresses { 8enum 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
57extern 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
80extern 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 */
87static 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
104static 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