Commit | Line | Data |
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c577b098 GP |
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 | ||
1965aae3 PA |
14 | #ifndef _ASM_X86_FIXMAP_H |
15 | #define _ASM_X86_FIXMAP_H | |
3ec96783 | 16 | |
c577b098 GP |
17 | #ifndef __ASSEMBLY__ |
18 | #include <linux/kernel.h> | |
19 | #include <asm/acpi.h> | |
20 | #include <asm/apicdef.h> | |
21 | #include <asm/page.h> | |
22 | #ifdef CONFIG_X86_32 | |
23 | #include <linux/threads.h> | |
24 | #include <asm/kmap_types.h> | |
25 | #else | |
f40c3300 | 26 | #include <uapi/asm/vsyscall.h> |
c577b098 GP |
27 | #endif |
28 | ||
29 | /* | |
30 | * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall | |
31 | * uses fixmaps that relies on FIXADDR_TOP for proper address calculation. | |
32 | * Because of this, FIXADDR_TOP x86 integration was left as later work. | |
33 | */ | |
34 | #ifdef CONFIG_X86_32 | |
35 | /* used by vmalloc.c, vsyscall.lds.S. | |
36 | * | |
37 | * Leave one empty page between vmalloc'ed areas and | |
38 | * the start of the fixmap. | |
39 | */ | |
40 | extern unsigned long __FIXADDR_TOP; | |
41 | #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) | |
c577b098 | 42 | #else |
f40c3300 AL |
43 | #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \ |
44 | PAGE_SIZE) | |
c577b098 GP |
45 | #endif |
46 | ||
47 | ||
48 | /* | |
49 | * Here we define all the compile-time 'special' virtual | |
50 | * addresses. The point is to have a constant address at | |
51 | * compile time, but to set the physical address only | |
52 | * in the boot process. | |
53 | * for x86_32: We allocate these special addresses | |
54 | * from the end of virtual memory (0xfffff000) backwards. | |
55 | * Also this lets us do fail-safe vmalloc(), we | |
56 | * can guarantee that these special addresses and | |
57 | * vmalloc()-ed addresses never overlap. | |
58 | * | |
59 | * These 'compile-time allocated' memory buffers are | |
60 | * fixed-size 4k pages (or larger if used with an increment | |
61 | * higher than 1). Use set_fixmap(idx,phys) to associate | |
62 | * physical memory with fixmap indices. | |
63 | * | |
64 | * TLB entries of such buffers will not be flushed across | |
65 | * task switches. | |
66 | */ | |
67 | enum fixed_addresses { | |
96a388de | 68 | #ifdef CONFIG_X86_32 |
c577b098 | 69 | FIX_HOLE, |
96a388de | 70 | #else |
1ad83c85 | 71 | #ifdef CONFIG_X86_VSYSCALL_EMULATION |
f40c3300 | 72 | VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, |
1ad83c85 | 73 | #endif |
96a388de | 74 | #endif |
c577b098 GP |
75 | FIX_DBGP_BASE, |
76 | FIX_EARLYCON_MEM_BASE, | |
ff30a054 JB |
77 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
78 | FIX_OHCI1394_BASE, | |
79 | #endif | |
c577b098 GP |
80 | #ifdef CONFIG_X86_LOCAL_APIC |
81 | FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ | |
82 | #endif | |
83 | #ifdef CONFIG_X86_IO_APIC | |
84 | FIX_IO_APIC_BASE_0, | |
85 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, | |
c577b098 | 86 | #endif |
4eefbe79 | 87 | FIX_RO_IDT, /* Virtual mapping for read-only IDT */ |
c577b098 GP |
88 | #ifdef CONFIG_X86_32 |
89 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ | |
90 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | |
91 | #ifdef CONFIG_PCI_MMCONFIG | |
92 | FIX_PCIE_MCFG, | |
93 | #endif | |
94 | #endif | |
95 | #ifdef CONFIG_PARAVIRT | |
96 | FIX_PARAVIRT_BOOTMAP, | |
97 | #endif | |
12b9d7cc MD |
98 | FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */ |
99 | FIX_TEXT_POKE0, /* first page is last, because allocation is backward */ | |
933b9463 | 100 | #ifdef CONFIG_X86_INTEL_MID |
7309282c FT |
101 | FIX_LNW_VRTC, |
102 | #endif | |
fa36e956 AV |
103 | __end_of_permanent_fixed_addresses, |
104 | ||
c577b098 | 105 | /* |
3eddc69f | 106 | * 512 temporary boot-time mappings, used by early_ioremap(), |
c577b098 GP |
107 | * before ioremap() is functional. |
108 | * | |
3eddc69f | 109 | * If necessary we round it up to the next 512 pages boundary so |
499a5f1e | 110 | * that we can have a single pgd entry and a single pte table: |
c577b098 GP |
111 | */ |
112 | #define NR_FIX_BTMAPS 64 | |
3eddc69f | 113 | #define FIX_BTMAPS_SLOTS 8 |
499a5f1e JB |
114 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |
115 | FIX_BTMAP_END = | |
116 | (__end_of_permanent_fixed_addresses ^ | |
117 | (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) & | |
118 | -PTRS_PER_PTE | |
119 | ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - | |
120 | (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1)) | |
121 | : __end_of_permanent_fixed_addresses, | |
122 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, | |
c577b098 GP |
123 | #ifdef CONFIG_X86_32 |
124 | FIX_WP_TEST, | |
31625340 JC |
125 | #endif |
126 | #ifdef CONFIG_INTEL_TXT | |
127 | FIX_TBOOT_BASE, | |
c577b098 GP |
128 | #endif |
129 | __end_of_fixed_addresses | |
130 | }; | |
131 | ||
132 | ||
133 | extern void reserve_top_address(unsigned long reserve); | |
134 | ||
135 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) | |
c577b098 | 136 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
3ec96783 | 137 | |
7c7e6e07 JF |
138 | extern int fixmaps_set; |
139 | ||
fd940934 KP |
140 | extern pte_t *kmap_pte; |
141 | extern pgprot_t kmap_prot; | |
142 | extern pte_t *pkmap_page_table; | |
143 | ||
aeaaa59c JF |
144 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
145 | void native_set_fixmap(enum fixed_addresses idx, | |
3b3809ac | 146 | phys_addr_t phys, pgprot_t flags); |
aeaaa59c JF |
147 | |
148 | #ifndef CONFIG_PARAVIRT | |
149 | static inline void __set_fixmap(enum fixed_addresses idx, | |
3b3809ac | 150 | phys_addr_t phys, pgprot_t flags) |
aeaaa59c JF |
151 | { |
152 | native_set_fixmap(idx, phys, flags); | |
153 | } | |
154 | #endif | |
155 | ||
114cefc8 | 156 | #include <asm-generic/fixmap.h> |
5a47c7da | 157 | |
5b7c73e0 MS |
158 | #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags) |
159 | #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0)) | |
160 | ||
161 | void __early_set_fixmap(enum fixed_addresses idx, | |
162 | phys_addr_t phys, pgprot_t flags); | |
163 | ||
c577b098 | 164 | #endif /* !__ASSEMBLY__ */ |
1965aae3 | 165 | #endif /* _ASM_X86_FIXMAP_H */ |