ia64/xen-unstable

view linux-2.6-xen-sparse/include/asm-x86_64/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 55268b90a519
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 */
11 #ifndef _ASM_FIXMAP_H
12 #define _ASM_FIXMAP_H
14 #include <linux/config.h>
15 #include <linux/kernel.h>
16 #include <asm/apicdef.h>
17 #include <xen/gnttab.h>
18 #include <asm/page.h>
19 #include <asm/vsyscall.h>
20 #include <asm/vsyscall32.h>
21 #include <asm/acpi.h>
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.
28 *
29 * these 'compile-time allocated' memory buffers are
30 * fixed-size 4k pages. (or larger if used with an increment
31 * highger than 1) use fixmap_set(idx,phys) to associate
32 * physical memory with fixmap indices.
33 *
34 * TLB entries of such buffers will not be flushed across
35 * task switches.
36 */
38 enum fixed_addresses {
39 VSYSCALL_LAST_PAGE,
40 VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
41 VSYSCALL_HPET,
42 FIX_HPET_BASE,
43 #ifdef CONFIG_X86_LOCAL_APIC
44 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
45 #endif
46 #ifdef CONFIG_X86_IO_APIC
47 FIX_IO_APIC_BASE_0,
48 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
49 #endif
50 #ifdef CONFIG_ACPI
51 FIX_ACPI_BEGIN,
52 FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
53 #endif
54 FIX_SHARED_INFO,
55 #define NR_FIX_ISAMAPS 256
56 FIX_ISAMAP_END,
57 FIX_ISAMAP_BEGIN = FIX_ISAMAP_END + NR_FIX_ISAMAPS - 1,
58 __end_of_fixed_addresses
59 };
61 extern void __set_fixmap (enum fixed_addresses idx,
62 unsigned long phys, pgprot_t flags);
64 #define set_fixmap(idx, phys) \
65 __set_fixmap(idx, phys, PAGE_KERNEL)
66 /*
67 * Some hardware wants to get fixmapped without caching.
68 */
69 #define set_fixmap_nocache(idx, phys) \
70 __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
72 #define clear_fixmap(idx) \
73 __set_fixmap(idx, 0, __pgprot(0))
75 #define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE)
76 #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
77 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
79 /* Only covers 32bit vsyscalls currently. Need another set for 64bit. */
80 #define FIXADDR_USER_START ((unsigned long)VSYSCALL32_VSYSCALL)
81 #define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE)
83 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
85 extern void __this_fixmap_does_not_exist(void);
87 /*
88 * 'index to address' translation. If anyone tries to use the idx
89 * directly without translation, we catch the bug with a NULL-deference
90 * kernel oops. Illegal ranges of incoming indices are caught too.
91 */
92 static __always_inline unsigned long fix_to_virt(const unsigned int idx)
93 {
94 /*
95 * this branch gets completely eliminated after inlining,
96 * except when someone tries to use fixaddr indices in an
97 * illegal way. (such as mixing up address types or using
98 * out-of-range indices).
99 *
100 * If it doesn't get removed, the linker will complain
101 * loudly with a reasonably clear error message..
102 */
103 if (idx >= __end_of_fixed_addresses)
104 __this_fixmap_does_not_exist();
106 return __fix_to_virt(idx);
107 }
109 #endif