ia64/xen-unstable

view linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/fixmap.h @ 4775:25570fbe05c7

bitkeeper revision 1.1389.5.17 (427a2e3dMxo6jmtcFafKR_cMZizuvw)

Merge firebug.cl.cam.ac.uk:/auto/groups/xeno-xenod/BK/xen-unstable.bk
into firebug.cl.cam.ac.uk:/local/scratch/cl349/xen-unstable.bk-clean
author cl349@firebug.cl.cam.ac.uk[cl349]
date Thu May 05 14:31:25 2005 +0000 (2005-05-05)
parents 608f95d3df77 eadf34921bc5
children f6bcd68a03f6
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 <asm-xen/gnttab.h>
18 #include <asm/page.h>
19 #include <asm/vsyscall.h>
20 #include <asm/vsyscall32.h>
22 /*
23 * Here we define all the compile-time 'special' virtual
24 * addresses. The point is to have a constant address at
25 * compile time, but to set the physical address only
26 * in the boot process.
27 *
28 * these 'compile-time allocated' memory buffers are
29 * fixed-size 4k pages. (or larger if used with an increment
30 * highger than 1) use fixmap_set(idx,phys) to associate
31 * physical memory with fixmap indices.
32 *
33 * TLB entries of such buffers will not be flushed across
34 * task switches.
35 */
37 enum fixed_addresses {
38 VSYSCALL_LAST_PAGE,
39 VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
40 VSYSCALL_HPET,
41 FIX_HPET_BASE,
42 #ifdef CONFIG_X86_LOCAL_APIC
43 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
44 #endif
45 #ifdef CONFIG_X86_IO_APIC
46 FIX_IO_APIC_BASE_0,
47 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
48 #endif
49 FIX_SHARED_INFO,
50 FIX_GNTTAB_BEGIN,
51 FIX_GNTTAB_END = FIX_GNTTAB_BEGIN + NR_GRANT_FRAMES - 1,
52 #ifdef CONFIG_XEN_PHYSDEV_ACCESS
53 #define NR_FIX_ISAMAPS 256
54 FIX_ISAMAP_END,
55 FIX_ISAMAP_BEGIN = FIX_ISAMAP_END + NR_FIX_ISAMAPS - 1,
56 #endif
57 __end_of_fixed_addresses
58 };
60 extern void __set_fixmap (enum fixed_addresses idx,
61 unsigned long phys, pgprot_t flags);
63 extern void __set_fixmap_ma (enum fixed_addresses idx,
64 unsigned long mach, pgprot_t flags);
66 #define set_fixmap(idx, phys) \
67 __set_fixmap(idx, phys, PAGE_KERNEL)
69 #define set_fixmap_ma(idx, phys) \
70 __set_fixmap_ma(idx, phys, PAGE_KERNEL)
71 #define set_fixmap_ma_ro(idx, phys) \
72 __set_fixmap_ma(idx, phys, PAGE_KERNEL_RO)
74 /*
75 * Some hardware wants to get fixmapped without caching.
76 */
77 #define set_fixmap_nocache(idx, phys) \
78 __set_fixmap_ma(idx, phys, PAGE_KERNEL_NOCACHE)
80 #define clear_fixmap(idx) \
81 __set_fixmap(idx, 0, __pgprot(0))
83 #define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE)
84 #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
85 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
87 /* Only covers 32bit vsyscalls currently. Need another set for 64bit. */
88 #define FIXADDR_USER_START ((unsigned long)VSYSCALL32_VSYSCALL)
89 #define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE)
91 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
93 extern void __this_fixmap_does_not_exist(void);
95 /*
96 * 'index to address' translation. If anyone tries to use the idx
97 * directly without translation, we catch the bug with a NULL-deference
98 * kernel oops. Illegal ranges of incoming indices are caught too.
99 */
100 extern inline unsigned long fix_to_virt(const unsigned int idx)
101 {
102 /*
103 * this branch gets completely eliminated after inlining,
104 * except when someone tries to use fixaddr indices in an
105 * illegal way. (such as mixing up address types or using
106 * out-of-range indices).
107 *
108 * If it doesn't get removed, the linker will complain
109 * loudly with a reasonably clear error message..
110 */
111 if (idx >= __end_of_fixed_addresses)
112 __this_fixmap_does_not_exist();
114 return __fix_to_virt(idx);
115 }
117 #endif