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 */
11
12 #ifndef _ASM_FIXMAP_H
13 #define _ASM_FIXMAP_H
14
15 #include <asm/page.h>
16
17 #define FIXADDR_TOP (VMAP_VIRT_END - PAGE_SIZE)
18
19 #ifndef __ASSEMBLY__
20
21 #include <xen/acpi.h>
22 #include <xen/pfn.h>
23 #include <xen/kexec.h>
24 #include <xen/iommu.h>
25 #include <asm/apicdef.h>
26 #include <asm/amd-iommu.h>
27 #include <asm/msi.h>
28 #include <acpi/apei.h>
29
30 /*
31 * Here we define all the compile-time 'special' virtual
32 * addresses. The point is to have a constant address at
33 * compile time, but to set the physical address only
34 * in the boot process. We allocate these special addresses
35 * from the end of virtual memory backwards.
36 */
37 enum fixed_addresses {
38 /* Index 0 is reserved since fix_to_virt(0) == FIXADDR_TOP. */
39 FIX_RESERVED,
40 /*
41 * Indexes using the page tables set up before entering __start_xen()
42 * must be among the first (L1_PAGETABLE_ENTRIES - 1) entries.
43 * These are generally those needed by the various console drivers.
44 */
45 FIX_COM_BEGIN,
46 FIX_COM_END,
47 FIX_EHCI_DBGP,
48 #ifdef CONFIG_XEN_GUEST
49 FIX_PV_CONSOLE,
50 FIX_XEN_SHARED_INFO,
51 #endif /* CONFIG_XEN_GUEST */
52 /* Everything else should go further down. */
53 FIX_APIC_BASE,
54 FIX_IO_APIC_BASE_0,
55 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
56 FIX_ACPI_BEGIN,
57 FIX_ACPI_END = FIX_ACPI_BEGIN + NUM_FIXMAP_ACPI_PAGES - 1,
58 FIX_HPET_BASE,
59 FIX_TBOOT_SHARED_BASE,
60 FIX_MSIX_IO_RESERV_BASE,
61 FIX_MSIX_IO_RESERV_END = FIX_MSIX_IO_RESERV_BASE + FIX_MSIX_MAX_PAGES -1,
62 FIX_TBOOT_MAP_ADDRESS,
63 FIX_APEI_RANGE_BASE,
64 FIX_APEI_RANGE_END = FIX_APEI_RANGE_BASE + FIX_APEI_RANGE_MAX -1,
65 FIX_EFI_MPF,
66 __end_of_fixed_addresses
67 };
68
69 #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
70 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
71
72 extern void __set_fixmap(
73 enum fixed_addresses idx, unsigned long mfn, unsigned long flags);
74
75 #define set_fixmap(idx, phys) \
76 __set_fixmap(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR)
77
78 #define set_fixmap_nocache(idx, phys) \
79 __set_fixmap(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR_UCMINUS)
80
81 #define clear_fixmap(idx) __set_fixmap(idx, 0, 0)
82
83 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
84 #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
85
86 #define fix_to_virt(x) ((void *)__fix_to_virt(x))
87
virt_to_fix(const unsigned long vaddr)88 static inline unsigned long virt_to_fix(const unsigned long vaddr)
89 {
90 BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
91 return __virt_to_fix(vaddr);
92 }
93
94 #endif /* __ASSEMBLY__ */
95
96 #endif
97