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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 | |
26 | #include <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) | |
42 | ||
43 | #define FIXADDR_USER_START __fix_to_virt(FIX_VDSO) | |
44 | #define FIXADDR_USER_END __fix_to_virt(FIX_VDSO - 1) | |
45 | #else | |
46 | #define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE) | |
47 | ||
48 | /* Only covers 32bit vsyscalls currently. Need another set for 64bit. */ | |
49 | #define FIXADDR_USER_START ((unsigned long)VSYSCALL32_VSYSCALL) | |
50 | #define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE) | |
51 | #endif | |
52 | ||
53 | ||
54 | /* | |
55 | * Here we define all the compile-time 'special' virtual | |
56 | * addresses. The point is to have a constant address at | |
57 | * compile time, but to set the physical address only | |
58 | * in the boot process. | |
59 | * for x86_32: We allocate these special addresses | |
60 | * from the end of virtual memory (0xfffff000) backwards. | |
61 | * Also this lets us do fail-safe vmalloc(), we | |
62 | * can guarantee that these special addresses and | |
63 | * vmalloc()-ed addresses never overlap. | |
64 | * | |
65 | * These 'compile-time allocated' memory buffers are | |
66 | * fixed-size 4k pages (or larger if used with an increment | |
67 | * higher than 1). Use set_fixmap(idx,phys) to associate | |
68 | * physical memory with fixmap indices. | |
69 | * | |
70 | * TLB entries of such buffers will not be flushed across | |
71 | * task switches. | |
72 | */ | |
73 | enum fixed_addresses { | |
96a388de | 74 | #ifdef CONFIG_X86_32 |
c577b098 GP |
75 | FIX_HOLE, |
76 | FIX_VDSO, | |
96a388de | 77 | #else |
c577b098 GP |
78 | VSYSCALL_LAST_PAGE, |
79 | VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE | |
80 | + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1, | |
81 | VSYSCALL_HPET, | |
96a388de | 82 | #endif |
c577b098 GP |
83 | FIX_DBGP_BASE, |
84 | FIX_EARLYCON_MEM_BASE, | |
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, | |
91 | #endif | |
c577b098 GP |
92 | #ifdef CONFIG_X86_VISWS_APIC |
93 | FIX_CO_CPU, /* Cobalt timer */ | |
94 | FIX_CO_APIC, /* Cobalt APIC Redirection Table */ | |
95 | FIX_LI_PCIA, /* Lithium PCI Bridge A */ | |
96 | FIX_LI_PCIB, /* Lithium PCI Bridge B */ | |
97 | #endif | |
98 | #ifdef CONFIG_X86_F00F_BUG | |
99 | FIX_F00F_IDT, /* Virtual mapping for IDT */ | |
100 | #endif | |
101 | #ifdef CONFIG_X86_CYCLONE_TIMER | |
102 | FIX_CYCLONE_TIMER, /*cyclone timer register*/ | |
103 | #endif | |
104 | #ifdef CONFIG_X86_32 | |
105 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ | |
106 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | |
107 | #ifdef CONFIG_PCI_MMCONFIG | |
108 | FIX_PCIE_MCFG, | |
109 | #endif | |
110 | #endif | |
111 | #ifdef CONFIG_PARAVIRT | |
112 | FIX_PARAVIRT_BOOTMAP, | |
113 | #endif | |
78ff7fae MH |
114 | FIX_TEXT_POKE0, /* reserve 2 pages for text_poke() */ |
115 | FIX_TEXT_POKE1, | |
c577b098 GP |
116 | __end_of_permanent_fixed_addresses, |
117 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT | |
118 | FIX_OHCI1394_BASE, | |
119 | #endif | |
120 | /* | |
121 | * 256 temporary boot-time mappings, used by early_ioremap(), | |
122 | * before ioremap() is functional. | |
123 | * | |
124 | * We round it up to the next 256 pages boundary so that we | |
125 | * can have a single pgd entry and a single pte table: | |
126 | */ | |
127 | #define NR_FIX_BTMAPS 64 | |
128 | #define FIX_BTMAPS_SLOTS 4 | |
129 | FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 - | |
130 | (__end_of_permanent_fixed_addresses & 255), | |
131 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_SLOTS - 1, | |
132 | #ifdef CONFIG_X86_32 | |
133 | FIX_WP_TEST, | |
134 | #endif | |
135 | __end_of_fixed_addresses | |
136 | }; | |
137 | ||
138 | ||
139 | extern void reserve_top_address(unsigned long reserve); | |
140 | ||
141 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) | |
142 | #define FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) | |
143 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) | |
144 | #define FIXADDR_BOOT_START (FIXADDR_TOP - FIXADDR_BOOT_SIZE) | |
3ec96783 | 145 | |
7c7e6e07 JF |
146 | extern int fixmaps_set; |
147 | ||
fd940934 KP |
148 | extern pte_t *kmap_pte; |
149 | extern pgprot_t kmap_prot; | |
150 | extern pte_t *pkmap_page_table; | |
151 | ||
aeaaa59c JF |
152 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
153 | void native_set_fixmap(enum fixed_addresses idx, | |
154 | unsigned long phys, pgprot_t flags); | |
155 | ||
156 | #ifndef CONFIG_PARAVIRT | |
157 | static inline void __set_fixmap(enum fixed_addresses idx, | |
158 | unsigned long phys, pgprot_t flags) | |
159 | { | |
160 | native_set_fixmap(idx, phys, flags); | |
161 | } | |
162 | #endif | |
163 | ||
944256e0 JF |
164 | #define set_fixmap(idx, phys) \ |
165 | __set_fixmap(idx, phys, PAGE_KERNEL) | |
166 | ||
167 | /* | |
168 | * Some hardware wants to get fixmapped without caching. | |
169 | */ | |
170 | #define set_fixmap_nocache(idx, phys) \ | |
171 | __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) | |
172 | ||
3ec96783 IM |
173 | #define clear_fixmap(idx) \ |
174 | __set_fixmap(idx, 0, __pgprot(0)) | |
175 | ||
944256e0 JF |
176 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) |
177 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | |
178 | ||
179 | extern void __this_fixmap_does_not_exist(void); | |
180 | ||
181 | /* | |
182 | * 'index to address' translation. If anyone tries to use the idx | |
183 | * directly without translation, we catch the bug with a NULL-deference | |
184 | * kernel oops. Illegal ranges of incoming indices are caught too. | |
185 | */ | |
186 | static __always_inline unsigned long fix_to_virt(const unsigned int idx) | |
187 | { | |
188 | /* | |
189 | * this branch gets completely eliminated after inlining, | |
190 | * except when someone tries to use fixaddr indices in an | |
191 | * illegal way. (such as mixing up address types or using | |
192 | * out-of-range indices). | |
193 | * | |
194 | * If it doesn't get removed, the linker will complain | |
195 | * loudly with a reasonably clear error message.. | |
196 | */ | |
197 | if (idx >= __end_of_fixed_addresses) | |
198 | __this_fixmap_does_not_exist(); | |
199 | ||
200 | return __fix_to_virt(idx); | |
201 | } | |
202 | ||
203 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | |
204 | { | |
205 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | |
206 | return __virt_to_fix(vaddr); | |
207 | } | |
c577b098 | 208 | #endif /* !__ASSEMBLY__ */ |
1965aae3 | 209 | #endif /* _ASM_X86_FIXMAP_H */ |