ia64/xen-unstable

view linux-2.6-xen-sparse/include/asm-xen/asm-i386/fixmap.h @ 6294:1a0723cd37f1

Fix many uses of machine addresses in XenLinux. Primarily
this fixes users of virt_to_machine/machine_to_virt to
use virt_to_mfn/mfn_to_virt where that is more appropriate.

This should be a big step to improved PAE stability.

Signed-off-by: Keir Fraser <keir@xensource.com>
author kaf24@firebug.cl.cam.ac.uk
date Fri Aug 19 16:06:43 2005 +0000 (2005-08-19)
parents 56a63f9f378f
children f51fe43c5d1c 5f4724c13040 81576d3d1ca8 3a8f27c6d56c
line source
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 */
13 #ifndef _ASM_FIXMAP_H
14 #define _ASM_FIXMAP_H
16 #include <linux/config.h>
18 /* used by vmalloc.c, vsyscall.lds.S.
19 *
20 * Leave one empty page between vmalloc'ed areas and
21 * the start of the fixmap.
22 */
23 #define __FIXADDR_TOP (HYPERVISOR_VIRT_START - 2 * PAGE_SIZE)
25 #ifndef __ASSEMBLY__
26 #include <linux/kernel.h>
27 #include <asm/acpi.h>
28 #include <asm/apicdef.h>
29 #include <asm/page.h>
30 #include <asm-xen/gnttab.h>
31 #ifdef CONFIG_HIGHMEM
32 #include <linux/threads.h>
33 #include <asm/kmap_types.h>
34 #endif
36 /*
37 * Here we define all the compile-time 'special' virtual
38 * addresses. The point is to have a constant address at
39 * compile time, but to set the physical address only
40 * in the boot process. We allocate these special addresses
41 * from the end of virtual memory (0xfffff000) backwards.
42 * Also this lets us do fail-safe vmalloc(), we
43 * can guarantee that these special addresses and
44 * vmalloc()-ed addresses never overlap.
45 *
46 * these 'compile-time allocated' memory buffers are
47 * fixed-size 4k pages. (or larger if used with an increment
48 * highger than 1) use fixmap_set(idx,phys) to associate
49 * physical memory with fixmap indices.
50 *
51 * TLB entries of such buffers will not be flushed across
52 * task switches.
53 */
54 enum fixed_addresses {
55 FIX_HOLE,
56 FIX_VSYSCALL,
57 #ifdef CONFIG_X86_LOCAL_APIC
58 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
59 #endif
60 #ifdef CONFIG_X86_IO_APIC
61 FIX_IO_APIC_BASE_0,
62 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
63 #endif
64 #ifdef CONFIG_X86_VISWS_APIC
65 FIX_CO_CPU, /* Cobalt timer */
66 FIX_CO_APIC, /* Cobalt APIC Redirection Table */
67 FIX_LI_PCIA, /* Lithium PCI Bridge A */
68 FIX_LI_PCIB, /* Lithium PCI Bridge B */
69 #endif
70 #ifdef CONFIG_X86_F00F_BUG
71 FIX_F00F_IDT, /* Virtual mapping for IDT */
72 #endif
73 #ifdef CONFIG_X86_CYCLONE_TIMER
74 FIX_CYCLONE_TIMER, /*cyclone timer register*/
75 #endif
76 #ifdef CONFIG_HIGHMEM
77 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
78 FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
79 #endif
80 #ifdef CONFIG_ACPI_BOOT
81 FIX_ACPI_BEGIN,
82 FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
83 FIX_ACPI_RSDP_PAGE,
84 #endif
85 #ifdef CONFIG_PCI_MMCONFIG
86 FIX_PCIE_MCFG,
87 #endif
88 FIX_SHARED_INFO,
89 FIX_GNTTAB_BEGIN,
90 FIX_GNTTAB_END = FIX_GNTTAB_BEGIN + NR_GRANT_FRAMES - 1,
91 #ifdef CONFIG_XEN_PHYSDEV_ACCESS
92 #define NR_FIX_ISAMAPS 256
93 FIX_ISAMAP_END,
94 FIX_ISAMAP_BEGIN = FIX_ISAMAP_END + NR_FIX_ISAMAPS - 1,
95 #endif
96 __end_of_permanent_fixed_addresses,
97 /* temporary boot-time mappings, used before ioremap() is functional */
98 #define NR_FIX_BTMAPS 16
99 FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
100 FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS - 1,
101 FIX_WP_TEST,
102 __end_of_fixed_addresses
103 };
105 extern void __set_fixmap(
106 enum fixed_addresses idx, maddr_t phys, pgprot_t flags);
108 #define set_fixmap(idx, phys) \
109 __set_fixmap(idx, phys, PAGE_KERNEL)
110 /*
111 * Some hardware wants to get fixmapped without caching.
112 */
113 #define set_fixmap_nocache(idx, phys) \
114 __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
116 #define clear_fixmap(idx) \
117 __set_fixmap(idx, 0, __pgprot(0))
119 #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
121 #define __FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
122 #define __FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
123 #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE)
124 #define FIXADDR_BOOT_START (FIXADDR_TOP - __FIXADDR_BOOT_SIZE)
126 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
127 #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
129 /*
130 * This is the range that is readable by user mode, and things
131 * acting like user mode such as get_user_pages.
132 */
133 #define FIXADDR_USER_START (__fix_to_virt(FIX_VSYSCALL))
134 #define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE)
137 extern void __this_fixmap_does_not_exist(void);
139 /*
140 * 'index to address' translation. If anyone tries to use the idx
141 * directly without tranlation, we catch the bug with a NULL-deference
142 * kernel oops. Illegal ranges of incoming indices are caught too.
143 */
144 static __always_inline unsigned long fix_to_virt(const unsigned int idx)
145 {
146 /*
147 * this branch gets completely eliminated after inlining,
148 * except when someone tries to use fixaddr indices in an
149 * illegal way. (such as mixing up address types or using
150 * out-of-range indices).
151 *
152 * If it doesn't get removed, the linker will complain
153 * loudly with a reasonably clear error message..
154 */
155 if (idx >= __end_of_fixed_addresses)
156 __this_fixmap_does_not_exist();
158 return __fix_to_virt(idx);
159 }
161 static inline unsigned long virt_to_fix(const unsigned long vaddr)
162 {
163 BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
164 return __virt_to_fix(vaddr);
165 }
167 #endif /* !__ASSEMBLY__ */
168 #endif