source: trunk/packages/xen-3.1/xen-3.1/linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/fixmap.h @ 34

Last change on this file since 34 was 34, checked in by hartmans, 18 years ago

Add xen and xen-common

File size: 4.5 KB
Line 
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
17/* used by vmalloc.c, vsyscall.lds.S.
18 *
19 * Leave one empty page between vmalloc'ed areas and
20 * the start of the fixmap.
21 */
22extern unsigned long __FIXADDR_TOP;
23
24#ifndef __ASSEMBLY__
25#include <linux/kernel.h>
26#include <asm/acpi.h>
27#include <asm/apicdef.h>
28#include <asm/page.h>
29#ifdef CONFIG_HIGHMEM
30#include <linux/threads.h>
31#include <asm/kmap_types.h>
32#endif
33
34/*
35 * Here we define all the compile-time 'special' virtual
36 * addresses. The point is to have a constant address at
37 * compile time, but to set the physical address only
38 * in the boot process. We allocate these special addresses
39 * from the end of virtual memory (0xfffff000) backwards.
40 * Also this lets us do fail-safe vmalloc(), we
41 * can guarantee that these special addresses and
42 * vmalloc()-ed addresses never overlap.
43 *
44 * these 'compile-time allocated' memory buffers are
45 * fixed-size 4k pages. (or larger if used with an increment
46 * highger than 1) use fixmap_set(idx,phys) to associate
47 * physical memory with fixmap indices.
48 *
49 * TLB entries of such buffers will not be flushed across
50 * task switches.
51 */
52enum fixed_addresses {
53        FIX_HOLE,
54        FIX_VDSO,
55#ifdef CONFIG_X86_LOCAL_APIC
56        FIX_APIC_BASE,  /* local (CPU) APIC) -- required for SMP or not */
57#endif
58#ifdef CONFIG_X86_IO_APIC
59        FIX_IO_APIC_BASE_0,
60        FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
61#endif
62#ifdef CONFIG_X86_VISWS_APIC
63        FIX_CO_CPU,     /* Cobalt timer */
64        FIX_CO_APIC,    /* Cobalt APIC Redirection Table */ 
65        FIX_LI_PCIA,    /* Lithium PCI Bridge A */
66        FIX_LI_PCIB,    /* Lithium PCI Bridge B */
67#endif
68#ifdef CONFIG_X86_F00F_BUG
69        FIX_F00F_IDT,   /* Virtual mapping for IDT */
70#endif
71#ifdef CONFIG_X86_CYCLONE_TIMER
72        FIX_CYCLONE_TIMER, /*cyclone timer register*/
73#endif
74#ifdef CONFIG_HIGHMEM
75        FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
76        FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
77#endif
78#ifdef CONFIG_ACPI
79        FIX_ACPI_BEGIN,
80        FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
81#endif
82#ifdef CONFIG_PCI_MMCONFIG
83        FIX_PCIE_MCFG,
84#endif
85        FIX_SHARED_INFO,
86#define NR_FIX_ISAMAPS  256
87        FIX_ISAMAP_END,
88        FIX_ISAMAP_BEGIN = FIX_ISAMAP_END + NR_FIX_ISAMAPS - 1,
89        __end_of_permanent_fixed_addresses,
90        /* temporary boot-time mappings, used before ioremap() is functional */
91#define NR_FIX_BTMAPS   16
92        FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
93        FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS - 1,
94        FIX_WP_TEST,
95        __end_of_fixed_addresses
96};
97
98extern void set_fixaddr_top(unsigned long top);
99
100extern void __set_fixmap(enum fixed_addresses idx,
101                                        maddr_t phys, pgprot_t flags);
102
103#define set_fixmap(idx, phys) \
104                __set_fixmap(idx, phys, PAGE_KERNEL)
105/*
106 * Some hardware wants to get fixmapped without caching.
107 */
108#define set_fixmap_nocache(idx, phys) \
109                __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
110
111#define clear_fixmap(idx) \
112                __set_fixmap(idx, 0, __pgprot(0))
113
114#define FIXADDR_TOP     ((unsigned long)__FIXADDR_TOP)
115
116#define __FIXADDR_SIZE  (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
117#define __FIXADDR_BOOT_SIZE     (__end_of_fixed_addresses << PAGE_SHIFT)
118#define FIXADDR_START           (FIXADDR_TOP - __FIXADDR_SIZE)
119#define FIXADDR_BOOT_START      (FIXADDR_TOP - __FIXADDR_BOOT_SIZE)
120
121#define __fix_to_virt(x)        (FIXADDR_TOP - ((x) << PAGE_SHIFT))
122#define __virt_to_fix(x)        ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
123
124extern void __this_fixmap_does_not_exist(void);
125
126/*
127 * 'index to address' translation. If anyone tries to use the idx
128 * directly without tranlation, we catch the bug with a NULL-deference
129 * kernel oops. Illegal ranges of incoming indices are caught too.
130 */
131static __always_inline unsigned long fix_to_virt(const unsigned int idx)
132{
133        /*
134         * this branch gets completely eliminated after inlining,
135         * except when someone tries to use fixaddr indices in an
136         * illegal way. (such as mixing up address types or using
137         * out-of-range indices).
138         *
139         * If it doesn't get removed, the linker will complain
140         * loudly with a reasonably clear error message..
141         */
142        if (idx >= __end_of_fixed_addresses)
143                __this_fixmap_does_not_exist();
144
145        return __fix_to_virt(idx);
146}
147
148static inline unsigned long virt_to_fix(const unsigned long vaddr)
149{
150        BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
151        return __virt_to_fix(vaddr);
152}
153
154#endif /* !__ASSEMBLY__ */
155#endif
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