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 #define FIXADDR_X_TOP (XEN_VIRT_END - PAGE_SIZE)
19
20 #ifndef __ASSEMBLY__
21
22 #include <xen/acpi.h>
23 #include <xen/pfn.h>
24 #include <xen/kexec.h>
25 #include <asm/apicdef.h>
26 #include <asm/msi.h>
27 #include <acpi/apei.h>
28
29 /*
30 * Here we define all the compile-time 'special' virtual
31 * addresses. The point is to have a constant address at
32 * compile time, but to set the physical address only
33 * in the boot process. We allocate these special addresses
34 * from the end of virtual memory backwards.
35 */
36 enum fixed_addresses {
37 /* Index 0 is reserved since fix_to_virt(0) == FIXADDR_TOP. */
38 FIX_RESERVED,
39 /*
40 * Indexes using the page tables set up before entering __start_xen()
41 * must be among the first (L1_PAGETABLE_ENTRIES - 1) entries.
42 * These are generally those needed by the various console drivers.
43 */
44 FIX_COM_BEGIN,
45 FIX_COM_END,
46 FIX_EHCI_DBGP,
47 #ifdef CONFIG_XEN_GUEST
48 FIX_PV_CONSOLE,
49 FIX_XEN_SHARED_INFO,
50 #endif /* CONFIG_XEN_GUEST */
51 /* Everything else should go further down. */
52 FIX_APIC_BASE,
53 FIX_IO_APIC_BASE_0,
54 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
55 FIX_ACPI_BEGIN,
56 FIX_ACPI_END = FIX_ACPI_BEGIN + NUM_FIXMAP_ACPI_PAGES - 1,
57 FIX_HPET_BASE,
58 FIX_TBOOT_SHARED_BASE,
59 FIX_MSIX_IO_RESERV_BASE,
60 FIX_MSIX_IO_RESERV_END = FIX_MSIX_IO_RESERV_BASE + FIX_MSIX_MAX_PAGES -1,
61 FIX_TBOOT_MAP_ADDRESS,
62 FIX_APEI_RANGE_BASE,
63 FIX_APEI_RANGE_END = FIX_APEI_RANGE_BASE + FIX_APEI_RANGE_MAX -1,
64 FIX_EFI_MPF,
65 __end_of_fixed_addresses
66 };
67
68 #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
69 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
70
71 extern void __set_fixmap(
72 enum fixed_addresses idx, unsigned long mfn, unsigned long flags);
73
74 #define set_fixmap(idx, phys) \
75 __set_fixmap(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR)
76
77 #define set_fixmap_nocache(idx, phys) \
78 __set_fixmap(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR_UCMINUS)
79
80 #define clear_fixmap(idx) __set_fixmap(idx, 0, 0)
81
82 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
83 #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
84
85 #define fix_to_virt(x) ((void *)__fix_to_virt(x))
86
virt_to_fix(const unsigned long vaddr)87 static inline unsigned long virt_to_fix(const unsigned long vaddr)
88 {
89 BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
90 return __virt_to_fix(vaddr);
91 }
92
93 enum fixed_addresses_x {
94 /* Index 0 is reserved since fix_x_to_virt(0) == FIXADDR_X_TOP. */
95 FIX_X_RESERVED,
96 #ifdef CONFIG_HYPERV_GUEST
97 FIX_X_HYPERV_HCALL,
98 #endif
99 __end_of_fixed_addresses_x
100 };
101
102 #define FIXADDR_X_SIZE (__end_of_fixed_addresses_x << PAGE_SHIFT)
103 #define FIXADDR_X_START (FIXADDR_X_TOP - FIXADDR_X_SIZE)
104
105 extern void __set_fixmap_x(
106 enum fixed_addresses_x idx, unsigned long mfn, unsigned long flags);
107
108 #define set_fixmap_x(idx, phys) \
109 __set_fixmap_x(idx, (phys)>>PAGE_SHIFT, PAGE_HYPERVISOR_RX | MAP_SMALL_PAGES)
110
111 #define clear_fixmap_x(idx) __set_fixmap_x(idx, 0, 0)
112
113 #define __fix_x_to_virt(x) (FIXADDR_X_TOP - ((x) << PAGE_SHIFT))
114 #define fix_x_to_virt(x) ((void *)__fix_x_to_virt(x))
115
116 #endif /* __ASSEMBLY__ */
117
118 #endif
119