ia64/xen-unstable

view xen/include/asm-x86/fixmap.h @ 12677:2b43fb3afb3e

[XEN] Kexec / Kdump: Code shared between x86_32 and x86_64

This patch contains Kexec / Kdump code shared between x86_32 and x86_64.

Signed-Off-By: Magnus Damm <magnus@valinux.co.jp>
Signed-Off-By: Simon Horman <horms@verge.net.au>
author Ian Campbell <ian.campbell@xensource.com>
date Thu Nov 30 12:38:51 2006 +0000 (2006-11-30)
parents d5f98d23427a
children ca495837a722
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 * Modifications for Xen are copyright (c) 2002-2004, K A Fraser
10 */
12 #ifndef _ASM_FIXMAP_H
13 #define _ASM_FIXMAP_H
15 #include <xen/config.h>
16 #include <asm/apicdef.h>
17 #include <asm/acpi.h>
18 #include <asm/page.h>
19 #include <xen/kexec.h>
21 /*
22 * Here we define all the compile-time 'special' virtual
23 * addresses. The point is to have a constant address at
24 * compile time, but to set the physical address only
25 * in the boot process. We allocate these special addresses
26 * from the end of virtual memory backwards.
27 */
28 enum fixed_addresses {
29 #ifdef CONFIG_X86_PAE
30 FIX_PAE_HIGHMEM_0,
31 FIX_PAE_HIGHMEM_END = FIX_PAE_HIGHMEM_0 + NR_CPUS-1,
32 #endif
33 FIX_APIC_BASE,
34 FIX_IO_APIC_BASE_0,
35 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
36 FIX_ACPI_BEGIN,
37 FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
38 FIX_HPET_BASE,
39 FIX_CYCLONE_TIMER,
40 FIX_KEXEC_BASE_0,
41 FIX_KEXEC_BASE_END = FIX_KEXEC_BASE_0 \
42 + ((KEXEC_XEN_NO_PAGES >> 1) * KEXEC_IMAGE_NR) - 1,
43 __end_of_fixed_addresses
44 };
46 #define FIXADDR_TOP (IOREMAP_VIRT_END - PAGE_SIZE)
47 #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
48 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
50 extern void __set_fixmap(
51 enum fixed_addresses idx, unsigned long mfn, unsigned long flags);
53 #define set_fixmap(idx, phys) \
54 __set_fixmap(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR)
56 #define set_fixmap_nocache(idx, phys) \
57 __set_fixmap(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR_NOCACHE)
59 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
60 #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
62 #define fix_to_virt(x) (__fix_to_virt(x))
64 static inline unsigned long virt_to_fix(const unsigned long vaddr)
65 {
66 BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
67 return __virt_to_fix(vaddr);
68 }
70 #endif