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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 | ||
c577b098 GP |
47 | /* |
48 | * Here we define all the compile-time 'special' virtual | |
49 | * addresses. The point is to have a constant address at | |
50 | * compile time, but to set the physical address only | |
51 | * in the boot process. | |
52 | * for x86_32: We allocate these special addresses | |
53 | * from the end of virtual memory (0xfffff000) backwards. | |
54 | * Also this lets us do fail-safe vmalloc(), we | |
55 | * can guarantee that these special addresses and | |
56 | * vmalloc()-ed addresses never overlap. | |
57 | * | |
58 | * These 'compile-time allocated' memory buffers are | |
59 | * fixed-size 4k pages (or larger if used with an increment | |
60 | * higher than 1). Use set_fixmap(idx,phys) to associate | |
61 | * physical memory with fixmap indices. | |
62 | * | |
63 | * TLB entries of such buffers will not be flushed across | |
64 | * task switches. | |
65 | */ | |
66 | enum fixed_addresses { | |
96a388de | 67 | #ifdef CONFIG_X86_32 |
c577b098 | 68 | FIX_HOLE, |
96a388de | 69 | #else |
1ad83c85 | 70 | #ifdef CONFIG_X86_VSYSCALL_EMULATION |
f40c3300 | 71 | VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, |
1ad83c85 | 72 | #endif |
96a388de | 73 | #endif |
c577b098 GP |
74 | FIX_DBGP_BASE, |
75 | FIX_EARLYCON_MEM_BASE, | |
ff30a054 JB |
76 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
77 | FIX_OHCI1394_BASE, | |
78 | #endif | |
c577b098 GP |
79 | #ifdef CONFIG_X86_LOCAL_APIC |
80 | FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ | |
81 | #endif | |
82 | #ifdef CONFIG_X86_IO_APIC | |
83 | FIX_IO_APIC_BASE_0, | |
84 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, | |
c577b098 | 85 | #endif |
c577b098 GP |
86 | #ifdef CONFIG_X86_32 |
87 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ | |
88 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | |
89 | #ifdef CONFIG_PCI_MMCONFIG | |
90 | FIX_PCIE_MCFG, | |
91 | #endif | |
92 | #endif | |
93 | #ifdef CONFIG_PARAVIRT | |
94 | FIX_PARAVIRT_BOOTMAP, | |
95 | #endif | |
12b9d7cc MD |
96 | FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */ |
97 | FIX_TEXT_POKE0, /* first page is last, because allocation is backward */ | |
933b9463 | 98 | #ifdef CONFIG_X86_INTEL_MID |
7309282c FT |
99 | FIX_LNW_VRTC, |
100 | #endif | |
69218e47 | 101 | |
4f89fa28 JM |
102 | #ifdef CONFIG_ACPI_APEI_GHES |
103 | /* Used for GHES mapping from assorted contexts */ | |
104 | FIX_APEI_GHES_IRQ, | |
105 | FIX_APEI_GHES_NMI, | |
106 | #endif | |
107 | ||
fa36e956 AV |
108 | __end_of_permanent_fixed_addresses, |
109 | ||
c577b098 | 110 | /* |
3eddc69f | 111 | * 512 temporary boot-time mappings, used by early_ioremap(), |
c577b098 GP |
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: |
c577b098 GP |
116 | */ |
117 | #define NR_FIX_BTMAPS 64 | |
3eddc69f | 118 | #define FIX_BTMAPS_SLOTS 8 |
499a5f1e JB |
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, | |
c577b098 GP |
128 | #ifdef CONFIG_X86_32 |
129 | FIX_WP_TEST, | |
31625340 JC |
130 | #endif |
131 | #ifdef CONFIG_INTEL_TXT | |
132 | FIX_TBOOT_BASE, | |
c577b098 GP |
133 | #endif |
134 | __end_of_fixed_addresses | |
135 | }; | |
136 | ||
137 | ||
138 | extern void reserve_top_address(unsigned long reserve); | |
139 | ||
140 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) | |
92a0f81d | 141 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
3ec96783 | 142 | |
7c7e6e07 JF |
143 | extern int fixmaps_set; |
144 | ||
fd940934 | 145 | extern pte_t *kmap_pte; |
7c360572 | 146 | #define kmap_prot PAGE_KERNEL |
fd940934 KP |
147 | extern pte_t *pkmap_page_table; |
148 | ||
aeaaa59c JF |
149 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
150 | void native_set_fixmap(enum fixed_addresses idx, | |
3b3809ac | 151 | phys_addr_t phys, pgprot_t flags); |
aeaaa59c JF |
152 | |
153 | #ifndef CONFIG_PARAVIRT | |
154 | static inline void __set_fixmap(enum fixed_addresses idx, | |
3b3809ac | 155 | phys_addr_t phys, pgprot_t flags) |
aeaaa59c JF |
156 | { |
157 | native_set_fixmap(idx, phys, flags); | |
158 | } | |
159 | #endif | |
160 | ||
21729f81 TL |
161 | /* |
162 | * FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not | |
163 | * supported for MMIO addresses, so make sure that the memory encryption | |
164 | * mask is not part of the page attributes. | |
165 | */ | |
166 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE | |
167 | ||
f88a68fa TL |
168 | /* |
169 | * Early memremap routines used for in-place encryption. The mappings created | |
170 | * by these routines are intended to be used as temporary mappings. | |
171 | */ | |
172 | void __init *early_memremap_encrypted(resource_size_t phys_addr, | |
173 | unsigned long size); | |
174 | void __init *early_memremap_encrypted_wp(resource_size_t phys_addr, | |
175 | unsigned long size); | |
176 | void __init *early_memremap_decrypted(resource_size_t phys_addr, | |
177 | unsigned long size); | |
178 | void __init *early_memremap_decrypted_wp(resource_size_t phys_addr, | |
179 | unsigned long size); | |
180 | ||
114cefc8 | 181 | #include <asm-generic/fixmap.h> |
5a47c7da | 182 | |
5b7c73e0 MS |
183 | #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags) |
184 | #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0)) | |
185 | ||
186 | void __early_set_fixmap(enum fixed_addresses idx, | |
187 | phys_addr_t phys, pgprot_t flags); | |
188 | ||
c577b098 | 189 | #endif /* !__ASSEMBLY__ */ |
1965aae3 | 190 | #endif /* _ASM_X86_FIXMAP_H */ |