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1da177e4 LT |
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 | */ | |
12 | ||
13 | #ifndef _ASM_FIXMAP_H | |
14 | #define _ASM_FIXMAP_H | |
15 | ||
1da177e4 LT |
16 | |
17 | /* used by vmalloc.c, vsyscall.lds.S. | |
18 | * | |
19 | * Leave one empty page between vmalloc'ed areas and | |
20 | * the start of the fixmap. | |
21 | */ | |
052e7994 | 22 | extern unsigned long __FIXADDR_TOP; |
d4f7a2c1 JF |
23 | #define FIXADDR_USER_START __fix_to_virt(FIX_VDSO) |
24 | #define FIXADDR_USER_END __fix_to_virt(FIX_VDSO - 1) | |
1da177e4 LT |
25 | |
26 | #ifndef __ASSEMBLY__ | |
27 | #include <linux/kernel.h> | |
28 | #include <asm/acpi.h> | |
29 | #include <asm/apicdef.h> | |
30 | #include <asm/page.h> | |
31 | #ifdef CONFIG_HIGHMEM | |
32 | #include <linux/threads.h> | |
33 | #include <asm/kmap_types.h> | |
34 | #endif | |
35 | ||
36 | /* | |
37 | * Here we define all the compile-time 'special' virtual | |
38 | * addresses. The point is to have a constant address at | |
39 | * compile time, but to set the physical address only | |
40 | * in the boot process. We allocate these special addresses | |
41 | * from the end of virtual memory (0xfffff000) backwards. | |
42 | * Also this lets us do fail-safe vmalloc(), we | |
43 | * can guarantee that these special addresses and | |
44 | * vmalloc()-ed addresses never overlap. | |
45 | * | |
46 | * these 'compile-time allocated' memory buffers are | |
47 | * fixed-size 4k pages. (or larger if used with an increment | |
48 | * highger than 1) use fixmap_set(idx,phys) to associate | |
49 | * physical memory with fixmap indices. | |
50 | * | |
51 | * TLB entries of such buffers will not be flushed across | |
52 | * task switches. | |
53 | */ | |
54 | enum fixed_addresses { | |
55 | FIX_HOLE, | |
e6e5494c | 56 | FIX_VDSO, |
18a8bd94 YL |
57 | FIX_DBGP_BASE, |
58 | FIX_EARLYCON_MEM_BASE, | |
1da177e4 LT |
59 | #ifdef CONFIG_X86_LOCAL_APIC |
60 | FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ | |
61 | #endif | |
62 | #ifdef CONFIG_X86_IO_APIC | |
63 | FIX_IO_APIC_BASE_0, | |
64 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1, | |
65 | #endif | |
66 | #ifdef CONFIG_X86_VISWS_APIC | |
67 | FIX_CO_CPU, /* Cobalt timer */ | |
1b42f516 | 68 | FIX_CO_APIC, /* Cobalt APIC Redirection Table */ |
1da177e4 LT |
69 | FIX_LI_PCIA, /* Lithium PCI Bridge A */ |
70 | FIX_LI_PCIB, /* Lithium PCI Bridge B */ | |
71 | #endif | |
72 | #ifdef CONFIG_X86_F00F_BUG | |
73 | FIX_F00F_IDT, /* Virtual mapping for IDT */ | |
74 | #endif | |
75 | #ifdef CONFIG_X86_CYCLONE_TIMER | |
76 | FIX_CYCLONE_TIMER, /*cyclone timer register*/ | |
1b42f516 | 77 | #endif |
1da177e4 LT |
78 | #ifdef CONFIG_HIGHMEM |
79 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ | |
80 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, | |
81 | #endif | |
888ba6c6 | 82 | #ifdef CONFIG_ACPI |
1da177e4 LT |
83 | FIX_ACPI_BEGIN, |
84 | FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1, | |
85 | #endif | |
86 | #ifdef CONFIG_PCI_MMCONFIG | |
87 | FIX_PCIE_MCFG, | |
90caccb9 JF |
88 | #endif |
89 | #ifdef CONFIG_PARAVIRT | |
90 | FIX_PARAVIRT_BOOTMAP, | |
1da177e4 LT |
91 | #endif |
92 | __end_of_permanent_fixed_addresses, | |
d701fda8 IM |
93 | /* |
94 | * 256 temporary boot-time mappings, used by early_ioremap(), | |
95 | * before ioremap() is functional. | |
96 | * | |
97 | * We round it up to the next 512 pages boundary so that we | |
98 | * can have a single pgd entry and a single pte table: | |
99 | */ | |
a8efa1cd | 100 | #define NR_FIX_BTMAPS 64 |
1b42f516 | 101 | #define FIX_BTMAPS_NESTING 4 |
cb7d0617 | 102 | FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 512 - |
d701fda8 | 103 | (__end_of_permanent_fixed_addresses & 511), |
1b42f516 | 104 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_NESTING - 1, |
1da177e4 | 105 | FIX_WP_TEST, |
f212ec4b BK |
106 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
107 | FIX_OHCI1394_BASE, | |
108 | #endif | |
1da177e4 LT |
109 | __end_of_fixed_addresses |
110 | }; | |
111 | ||
cb7d0617 JP |
112 | extern void __set_fixmap(enum fixed_addresses idx, |
113 | unsigned long phys, pgprot_t flags); | |
052e7994 | 114 | extern void reserve_top_address(unsigned long reserve); |
1da177e4 | 115 | |
cb7d0617 JP |
116 | #define set_fixmap(idx, phys) \ |
117 | __set_fixmap(idx, phys, PAGE_KERNEL) | |
1da177e4 LT |
118 | /* |
119 | * Some hardware wants to get fixmapped without caching. | |
120 | */ | |
cb7d0617 JP |
121 | #define set_fixmap_nocache(idx, phys) \ |
122 | __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) | |
1da177e4 | 123 | |
cb7d0617 JP |
124 | #define clear_fixmap(idx) \ |
125 | __set_fixmap(idx, 0, __pgprot(0)) | |
1da177e4 LT |
126 | |
127 | #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) | |
128 | ||
129 | #define __FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) | |
130 | #define __FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) | |
131 | #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE) | |
132 | #define FIXADDR_BOOT_START (FIXADDR_TOP - __FIXADDR_BOOT_SIZE) | |
133 | ||
134 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) | |
135 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | |
136 | ||
1da177e4 LT |
137 | extern void __this_fixmap_does_not_exist(void); |
138 | ||
139 | /* | |
140 | * 'index to address' translation. If anyone tries to use the idx | |
141 | * directly without tranlation, we catch the bug with a NULL-deference | |
142 | * kernel oops. Illegal ranges of incoming indices are caught too. | |
143 | */ | |
144 | static __always_inline unsigned long fix_to_virt(const unsigned int idx) | |
145 | { | |
146 | /* | |
147 | * this branch gets completely eliminated after inlining, | |
148 | * except when someone tries to use fixaddr indices in an | |
149 | * illegal way. (such as mixing up address types or using | |
150 | * out-of-range indices). | |
151 | * | |
152 | * If it doesn't get removed, the linker will complain | |
153 | * loudly with a reasonably clear error message.. | |
154 | */ | |
155 | if (idx >= __end_of_fixed_addresses) | |
156 | __this_fixmap_does_not_exist(); | |
157 | ||
cb7d0617 | 158 | return __fix_to_virt(idx); |
1da177e4 LT |
159 | } |
160 | ||
161 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | |
162 | { | |
163 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | |
164 | return __virt_to_fix(vaddr); | |
165 | } | |
166 | ||
167 | #endif /* !__ASSEMBLY__ */ | |
168 | #endif |