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> | |
71056ae2 | 22 | #include <asm/pvclock.h> |
c577b098 GP |
23 | #ifdef CONFIG_X86_32 |
24 | #include <linux/threads.h> | |
25 | #include <asm/kmap_types.h> | |
26 | #else | |
27 | #include <asm/vsyscall.h> | |
c577b098 GP |
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 | */ | |
41 | extern unsigned long __FIXADDR_TOP; | |
42 | #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) | |
43 | ||
44 | #define FIXADDR_USER_START __fix_to_virt(FIX_VDSO) | |
45 | #define FIXADDR_USER_END __fix_to_virt(FIX_VDSO - 1) | |
46 | #else | |
47 | #define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE) | |
48 | ||
49 | /* Only covers 32bit vsyscalls currently. Need another set for 64bit. */ | |
50 | #define FIXADDR_USER_START ((unsigned long)VSYSCALL32_VSYSCALL) | |
51 | #define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE) | |
52 | #endif | |
53 | ||
54 | ||
55 | /* | |
56 | * Here we define all the compile-time 'special' virtual | |
57 | * addresses. The point is to have a constant address at | |
58 | * compile time, but to set the physical address only | |
59 | * in the boot process. | |
60 | * for x86_32: We allocate these special addresses | |
61 | * from the end of virtual memory (0xfffff000) backwards. | |
62 | * Also this lets us do fail-safe vmalloc(), we | |
63 | * can guarantee that these special addresses and | |
64 | * vmalloc()-ed addresses never overlap. | |
65 | * | |
66 | * These 'compile-time allocated' memory buffers are | |
67 | * fixed-size 4k pages (or larger if used with an increment | |
68 | * higher than 1). Use set_fixmap(idx,phys) to associate | |
69 | * physical memory with fixmap indices. | |
70 | * | |
71 | * TLB entries of such buffers will not be flushed across | |
72 | * task switches. | |
73 | */ | |
74 | enum fixed_addresses { | |
96a388de | 75 | #ifdef CONFIG_X86_32 |
c577b098 GP |
76 | FIX_HOLE, |
77 | FIX_VDSO, | |
96a388de | 78 | #else |
c577b098 GP |
79 | VSYSCALL_LAST_PAGE, |
80 | VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE | |
81 | + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1, | |
9fd67b4e | 82 | VVAR_PAGE, |
c577b098 | 83 | VSYSCALL_HPET, |
71056ae2 MT |
84 | #endif |
85 | #ifdef CONFIG_PARAVIRT_CLOCK | |
86 | PVCLOCK_FIXMAP_BEGIN, | |
87 | PVCLOCK_FIXMAP_END = PVCLOCK_FIXMAP_BEGIN+PVCLOCK_VSYSCALL_NR_PAGES-1, | |
96a388de | 88 | #endif |
c577b098 GP |
89 | FIX_DBGP_BASE, |
90 | FIX_EARLYCON_MEM_BASE, | |
ff30a054 JB |
91 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
92 | FIX_OHCI1394_BASE, | |
93 | #endif | |
c577b098 GP |
94 | #ifdef CONFIG_X86_LOCAL_APIC |
95 | FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ | |
96 | #endif | |
97 | #ifdef CONFIG_X86_IO_APIC | |
98 | FIX_IO_APIC_BASE_0, | |
99 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, | |
100 | #endif | |
c577b098 GP |
101 | #ifdef CONFIG_X86_VISWS_APIC |
102 | FIX_CO_CPU, /* Cobalt timer */ | |
103 | FIX_CO_APIC, /* Cobalt APIC Redirection Table */ | |
104 | FIX_LI_PCIA, /* Lithium PCI Bridge A */ | |
105 | FIX_LI_PCIB, /* Lithium PCI Bridge B */ | |
106 | #endif | |
4eefbe79 | 107 | FIX_RO_IDT, /* Virtual mapping for read-only IDT */ |
c577b098 GP |
108 | #ifdef CONFIG_X86_CYCLONE_TIMER |
109 | FIX_CYCLONE_TIMER, /*cyclone timer register*/ | |
110 | #endif | |
111 | #ifdef CONFIG_X86_32 | |
112 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ | |
113 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | |
114 | #ifdef CONFIG_PCI_MMCONFIG | |
115 | FIX_PCIE_MCFG, | |
116 | #endif | |
117 | #endif | |
118 | #ifdef CONFIG_PARAVIRT | |
119 | FIX_PARAVIRT_BOOTMAP, | |
120 | #endif | |
12b9d7cc MD |
121 | FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */ |
122 | FIX_TEXT_POKE0, /* first page is last, because allocation is backward */ | |
933b9463 | 123 | #ifdef CONFIG_X86_INTEL_MID |
7309282c FT |
124 | FIX_LNW_VRTC, |
125 | #endif | |
fa36e956 AV |
126 | __end_of_permanent_fixed_addresses, |
127 | ||
c577b098 GP |
128 | /* |
129 | * 256 temporary boot-time mappings, used by early_ioremap(), | |
130 | * before ioremap() is functional. | |
131 | * | |
499a5f1e JB |
132 | * If necessary we round it up to the next 256 pages boundary so |
133 | * that we can have a single pgd entry and a single pte table: | |
c577b098 GP |
134 | */ |
135 | #define NR_FIX_BTMAPS 64 | |
136 | #define FIX_BTMAPS_SLOTS 4 | |
499a5f1e JB |
137 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |
138 | FIX_BTMAP_END = | |
139 | (__end_of_permanent_fixed_addresses ^ | |
140 | (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) & | |
141 | -PTRS_PER_PTE | |
142 | ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - | |
143 | (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1)) | |
144 | : __end_of_permanent_fixed_addresses, | |
145 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, | |
c577b098 GP |
146 | #ifdef CONFIG_X86_32 |
147 | FIX_WP_TEST, | |
31625340 JC |
148 | #endif |
149 | #ifdef CONFIG_INTEL_TXT | |
150 | FIX_TBOOT_BASE, | |
c577b098 GP |
151 | #endif |
152 | __end_of_fixed_addresses | |
153 | }; | |
154 | ||
155 | ||
156 | extern void reserve_top_address(unsigned long reserve); | |
157 | ||
158 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) | |
159 | #define FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) | |
160 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) | |
161 | #define FIXADDR_BOOT_START (FIXADDR_TOP - FIXADDR_BOOT_SIZE) | |
3ec96783 | 162 | |
7c7e6e07 JF |
163 | extern int fixmaps_set; |
164 | ||
fd940934 KP |
165 | extern pte_t *kmap_pte; |
166 | extern pgprot_t kmap_prot; | |
167 | extern pte_t *pkmap_page_table; | |
168 | ||
aeaaa59c JF |
169 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
170 | void native_set_fixmap(enum fixed_addresses idx, | |
3b3809ac | 171 | phys_addr_t phys, pgprot_t flags); |
aeaaa59c JF |
172 | |
173 | #ifndef CONFIG_PARAVIRT | |
174 | static inline void __set_fixmap(enum fixed_addresses idx, | |
3b3809ac | 175 | phys_addr_t phys, pgprot_t flags) |
aeaaa59c JF |
176 | { |
177 | native_set_fixmap(idx, phys, flags); | |
178 | } | |
179 | #endif | |
180 | ||
944256e0 JF |
181 | #define set_fixmap(idx, phys) \ |
182 | __set_fixmap(idx, phys, PAGE_KERNEL) | |
183 | ||
184 | /* | |
185 | * Some hardware wants to get fixmapped without caching. | |
186 | */ | |
187 | #define set_fixmap_nocache(idx, phys) \ | |
188 | __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) | |
189 | ||
3ec96783 IM |
190 | #define clear_fixmap(idx) \ |
191 | __set_fixmap(idx, 0, __pgprot(0)) | |
192 | ||
944256e0 JF |
193 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) |
194 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | |
195 | ||
196 | extern void __this_fixmap_does_not_exist(void); | |
197 | ||
198 | /* | |
199 | * 'index to address' translation. If anyone tries to use the idx | |
200 | * directly without translation, we catch the bug with a NULL-deference | |
201 | * kernel oops. Illegal ranges of incoming indices are caught too. | |
202 | */ | |
203 | static __always_inline unsigned long fix_to_virt(const unsigned int idx) | |
204 | { | |
205 | /* | |
206 | * this branch gets completely eliminated after inlining, | |
207 | * except when someone tries to use fixaddr indices in an | |
208 | * illegal way. (such as mixing up address types or using | |
209 | * out-of-range indices). | |
210 | * | |
211 | * If it doesn't get removed, the linker will complain | |
212 | * loudly with a reasonably clear error message.. | |
213 | */ | |
214 | if (idx >= __end_of_fixed_addresses) | |
215 | __this_fixmap_does_not_exist(); | |
216 | ||
217 | return __fix_to_virt(idx); | |
218 | } | |
219 | ||
220 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | |
221 | { | |
222 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | |
223 | return __virt_to_fix(vaddr); | |
224 | } | |
5a47c7da FT |
225 | |
226 | /* Return an pointer with offset calculated */ | |
91d95fda AM |
227 | static __always_inline unsigned long |
228 | __set_fixmap_offset(enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags) | |
5a47c7da FT |
229 | { |
230 | __set_fixmap(idx, phys, flags); | |
231 | return fix_to_virt(idx) + (phys & (PAGE_SIZE - 1)); | |
232 | } | |
233 | ||
234 | #define set_fixmap_offset(idx, phys) \ | |
235 | __set_fixmap_offset(idx, phys, PAGE_KERNEL) | |
236 | ||
237 | #define set_fixmap_offset_nocache(idx, phys) \ | |
238 | __set_fixmap_offset(idx, phys, PAGE_KERNEL_NOCACHE) | |
239 | ||
c577b098 | 240 | #endif /* !__ASSEMBLY__ */ |
1965aae3 | 241 | #endif /* _ASM_X86_FIXMAP_H */ |