kvm: fix crash in kvm_vcpu_reload_apic_access_page
[deliverable/linux.git] / arch / x86 / include / asm / fixmap.h
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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 *
10 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
11 * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009
12 */
13
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14#ifndef _ASM_X86_FIXMAP_H
15#define _ASM_X86_FIXMAP_H
3ec96783 16
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17#ifndef __ASSEMBLY__
18#include <linux/kernel.h>
19#include <asm/acpi.h>
20#include <asm/apicdef.h>
21#include <asm/page.h>
71056ae2 22#include <asm/pvclock.h>
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23#ifdef CONFIG_X86_32
24#include <linux/threads.h>
25#include <asm/kmap_types.h>
26#else
f40c3300 27#include <uapi/asm/vsyscall.h>
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28#endif
29
30/*
31 * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
32 * uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
33 * Because of this, FIXADDR_TOP x86 integration was left as later work.
34 */
35#ifdef CONFIG_X86_32
36/* used by vmalloc.c, vsyscall.lds.S.
37 *
38 * Leave one empty page between vmalloc'ed areas and
39 * the start of the fixmap.
40 */
41extern unsigned long __FIXADDR_TOP;
42#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
c577b098 43#else
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44#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
45 PAGE_SIZE)
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46#endif
47
48
49/*
50 * Here we define all the compile-time 'special' virtual
51 * addresses. The point is to have a constant address at
52 * compile time, but to set the physical address only
53 * in the boot process.
54 * for x86_32: We allocate these special addresses
55 * from the end of virtual memory (0xfffff000) backwards.
56 * Also this lets us do fail-safe vmalloc(), we
57 * can guarantee that these special addresses and
58 * vmalloc()-ed addresses never overlap.
59 *
60 * These 'compile-time allocated' memory buffers are
61 * fixed-size 4k pages (or larger if used with an increment
62 * higher than 1). Use set_fixmap(idx,phys) to associate
63 * physical memory with fixmap indices.
64 *
65 * TLB entries of such buffers will not be flushed across
66 * task switches.
67 */
68enum fixed_addresses {
96a388de 69#ifdef CONFIG_X86_32
c577b098 70 FIX_HOLE,
96a388de 71#else
1ad83c85 72#ifdef CONFIG_X86_VSYSCALL_EMULATION
f40c3300 73 VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
1ad83c85 74#endif
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75#ifdef CONFIG_PARAVIRT_CLOCK
76 PVCLOCK_FIXMAP_BEGIN,
77 PVCLOCK_FIXMAP_END = PVCLOCK_FIXMAP_BEGIN+PVCLOCK_VSYSCALL_NR_PAGES-1,
cbdce7b2 78#endif
96a388de 79#endif
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80 FIX_DBGP_BASE,
81 FIX_EARLYCON_MEM_BASE,
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82#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
83 FIX_OHCI1394_BASE,
84#endif
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85#ifdef CONFIG_X86_LOCAL_APIC
86 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
87#endif
88#ifdef CONFIG_X86_IO_APIC
89 FIX_IO_APIC_BASE_0,
90 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
c577b098 91#endif
4eefbe79 92 FIX_RO_IDT, /* Virtual mapping for read-only IDT */
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93#ifdef CONFIG_X86_32
94 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
95 FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
96#ifdef CONFIG_PCI_MMCONFIG
97 FIX_PCIE_MCFG,
98#endif
99#endif
100#ifdef CONFIG_PARAVIRT
101 FIX_PARAVIRT_BOOTMAP,
102#endif
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103 FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */
104 FIX_TEXT_POKE0, /* first page is last, because allocation is backward */
933b9463 105#ifdef CONFIG_X86_INTEL_MID
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106 FIX_LNW_VRTC,
107#endif
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108 __end_of_permanent_fixed_addresses,
109
c577b098 110 /*
3eddc69f 111 * 512 temporary boot-time mappings, used by early_ioremap(),
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112 * before ioremap() is functional.
113 *
3eddc69f 114 * If necessary we round it up to the next 512 pages boundary so
499a5f1e 115 * that we can have a single pgd entry and a single pte table:
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116 */
117#define NR_FIX_BTMAPS 64
3eddc69f 118#define FIX_BTMAPS_SLOTS 8
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119#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
120 FIX_BTMAP_END =
121 (__end_of_permanent_fixed_addresses ^
122 (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
123 -PTRS_PER_PTE
124 ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
125 (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
126 : __end_of_permanent_fixed_addresses,
127 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
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128#ifdef CONFIG_X86_32
129 FIX_WP_TEST,
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130#endif
131#ifdef CONFIG_INTEL_TXT
132 FIX_TBOOT_BASE,
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133#endif
134 __end_of_fixed_addresses
135};
136
137
138extern void reserve_top_address(unsigned long reserve);
139
140#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
c577b098 141#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
3ec96783 142
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143extern int fixmaps_set;
144
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145extern pte_t *kmap_pte;
146extern pgprot_t kmap_prot;
147extern pte_t *pkmap_page_table;
148
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149void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
150void native_set_fixmap(enum fixed_addresses idx,
3b3809ac 151 phys_addr_t phys, pgprot_t flags);
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152
153#ifndef CONFIG_PARAVIRT
154static inline void __set_fixmap(enum fixed_addresses idx,
3b3809ac 155 phys_addr_t phys, pgprot_t flags)
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156{
157 native_set_fixmap(idx, phys, flags);
158}
159#endif
160
114cefc8 161#include <asm-generic/fixmap.h>
5a47c7da 162
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163#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
164#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
165
166void __early_set_fixmap(enum fixed_addresses idx,
167 phys_addr_t phys, pgprot_t flags);
168
c577b098 169#endif /* !__ASSEMBLY__ */
1965aae3 170#endif /* _ASM_X86_FIXMAP_H */
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