ia64/xen-unstable

view linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/fixmap.h @ 9222:c5286130a96e

Map grant table pages in vmalloc kernel address space instead of fixmap.

Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
author cl349@firebug.cl.cam.ac.uk
date Fri Mar 10 13:27:24 2006 +0000 (2006-03-10)
parents d161c07014a3
children d6795f951c42
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 extern unsigned long __FIXADDR_TOP;
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 <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 #ifdef CONFIG_X86_LOCAL_APIC
57 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
58 #endif
59 #ifdef CONFIG_X86_IO_APIC
60 FIX_IO_APIC_BASE_0,
61 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
62 #endif
63 #ifdef CONFIG_X86_VISWS_APIC
64 FIX_CO_CPU, /* Cobalt timer */
65 FIX_CO_APIC, /* Cobalt APIC Redirection Table */
66 FIX_LI_PCIA, /* Lithium PCI Bridge A */
67 FIX_LI_PCIB, /* Lithium PCI Bridge B */
68 #endif
69 #ifdef CONFIG_X86_F00F_BUG
70 FIX_F00F_IDT, /* Virtual mapping for IDT */
71 #endif
72 #ifdef CONFIG_X86_CYCLONE_TIMER
73 FIX_CYCLONE_TIMER, /*cyclone timer register*/
74 #endif
75 #ifdef CONFIG_HIGHMEM
76 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
77 FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
78 #endif
79 #ifdef CONFIG_ACPI
80 FIX_ACPI_BEGIN,
81 FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
82 #endif
83 #ifdef CONFIG_PCI_MMCONFIG
84 FIX_PCIE_MCFG,
85 #endif
86 FIX_SHARED_INFO,
87 #define NR_FIX_ISAMAPS 256
88 FIX_ISAMAP_END,
89 FIX_ISAMAP_BEGIN = FIX_ISAMAP_END + NR_FIX_ISAMAPS - 1,
90 __end_of_permanent_fixed_addresses,
91 /* temporary boot-time mappings, used before ioremap() is functional */
92 #define NR_FIX_BTMAPS 16
93 FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
94 FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS - 1,
95 FIX_WP_TEST,
96 __end_of_fixed_addresses
97 };
99 extern void __set_fixmap(enum fixed_addresses idx,
100 maddr_t phys, pgprot_t flags);
102 extern void set_fixaddr_top(unsigned long top);
104 #define set_fixmap(idx, phys) \
105 __set_fixmap(idx, phys, PAGE_KERNEL)
106 /*
107 * Some hardware wants to get fixmapped without caching.
108 */
109 #define set_fixmap_nocache(idx, phys) \
110 __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
112 #define clear_fixmap(idx) \
113 __set_fixmap(idx, 0, __pgprot(0))
115 #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
117 #define __FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
118 #define __FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
119 #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE)
120 #define FIXADDR_BOOT_START (FIXADDR_TOP - __FIXADDR_BOOT_SIZE)
122 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
123 #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
125 extern void __this_fixmap_does_not_exist(void);
127 /*
128 * 'index to address' translation. If anyone tries to use the idx
129 * directly without tranlation, we catch the bug with a NULL-deference
130 * kernel oops. Illegal ranges of incoming indices are caught too.
131 */
132 static __always_inline unsigned long fix_to_virt(const unsigned int idx)
133 {
134 /*
135 * this branch gets completely eliminated after inlining,
136 * except when someone tries to use fixaddr indices in an
137 * illegal way. (such as mixing up address types or using
138 * out-of-range indices).
139 *
140 * If it doesn't get removed, the linker will complain
141 * loudly with a reasonably clear error message..
142 */
143 if (idx >= __end_of_fixed_addresses)
144 __this_fixmap_does_not_exist();
146 return __fix_to_virt(idx);
147 }
149 static inline unsigned long virt_to_fix(const unsigned long vaddr)
150 {
151 BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
152 return __virt_to_fix(vaddr);
153 }
155 #endif /* !__ASSEMBLY__ */
156 #endif