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1 | /* |
1 | /* |
2 | * fixmap.h: compile-time virtual memory allocation |
2 | * fixmap.h: compile-time virtual memory allocation |
3 | * |
3 | * |
4 | * This file is subject to the terms and conditions of the GNU General Public |
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 |
5 | * License. See the file "COPYING" in the main directory of this archive |
6 | * for more details. |
6 | * for more details. |
7 | * |
7 | * |
8 | * Copyright (C) 1998 Ingo Molnar |
8 | * Copyright (C) 1998 Ingo Molnar |
9 | * |
9 | * |
10 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 |
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 |
11 | * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009 |
12 | */ |
12 | */ |
13 | 13 | ||
14 | #ifndef _ASM_X86_FIXMAP_H |
14 | #ifndef _ASM_X86_FIXMAP_H |
15 | #define _ASM_X86_FIXMAP_H |
15 | #define _ASM_X86_FIXMAP_H |
16 | 16 | ||
17 | #ifndef __ASSEMBLY__ |
17 | #ifndef __ASSEMBLY__ |
18 | #include |
18 | #include |
19 | #include |
19 | #include |
20 | #include |
20 | #include |
21 | #include |
21 | #include |
22 | #ifdef CONFIG_X86_32 |
22 | #ifdef CONFIG_X86_32 |
23 | #include |
23 | #include |
24 | #include |
24 | #include |
25 | #else |
25 | #else |
26 | #include |
26 | #include |
27 | #endif |
27 | #endif |
28 | 28 | ||
29 | /* |
29 | /* |
30 | * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall |
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. |
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. |
32 | * Because of this, FIXADDR_TOP x86 integration was left as later work. |
33 | */ |
33 | */ |
34 | #ifdef CONFIG_X86_32 |
34 | #ifdef CONFIG_X86_32 |
35 | /* used by vmalloc.c, vsyscall.lds.S. |
35 | /* used by vmalloc.c, vsyscall.lds.S. |
36 | * |
36 | * |
37 | * Leave one empty page between vmalloc'ed areas and |
37 | * Leave one empty page between vmalloc'ed areas and |
38 | * the start of the fixmap. |
38 | * the start of the fixmap. |
39 | */ |
39 | */ |
40 | extern unsigned long __FIXADDR_TOP; |
40 | extern unsigned long __FIXADDR_TOP; |
41 | #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) |
41 | #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) |
42 | #else |
42 | #else |
43 | #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1< |
43 | #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1< |
44 | PAGE_SIZE) |
44 | PAGE_SIZE) |
45 | #endif |
45 | #endif |
46 | 46 | ||
47 | 47 | ||
48 | /* |
48 | /* |
49 | * Here we define all the compile-time 'special' virtual |
49 | * Here we define all the compile-time 'special' virtual |
50 | * addresses. The point is to have a constant address at |
50 | * addresses. The point is to have a constant address at |
51 | * compile time, but to set the physical address only |
51 | * compile time, but to set the physical address only |
52 | * in the boot process. |
52 | * in the boot process. |
53 | * for x86_32: We allocate these special addresses |
53 | * for x86_32: We allocate these special addresses |
54 | * from the end of virtual memory (0xfffff000) backwards. |
54 | * from the end of virtual memory (0xfffff000) backwards. |
55 | * Also this lets us do fail-safe vmalloc(), we |
55 | * Also this lets us do fail-safe vmalloc(), we |
56 | * can guarantee that these special addresses and |
56 | * can guarantee that these special addresses and |
57 | * vmalloc()-ed addresses never overlap. |
57 | * vmalloc()-ed addresses never overlap. |
58 | * |
58 | * |
59 | * These 'compile-time allocated' memory buffers are |
59 | * These 'compile-time allocated' memory buffers are |
60 | * fixed-size 4k pages (or larger if used with an increment |
60 | * fixed-size 4k pages (or larger if used with an increment |
61 | * higher than 1). Use set_fixmap(idx,phys) to associate |
61 | * higher than 1). Use set_fixmap(idx,phys) to associate |
62 | * physical memory with fixmap indices. |
62 | * physical memory with fixmap indices. |
63 | * |
63 | * |
64 | * TLB entries of such buffers will not be flushed across |
64 | * TLB entries of such buffers will not be flushed across |
65 | * task switches. |
65 | * task switches. |
66 | */ |
66 | */ |
67 | enum fixed_addresses { |
67 | enum fixed_addresses { |
68 | #ifdef CONFIG_X86_32 |
68 | #ifdef CONFIG_X86_32 |
69 | FIX_HOLE, |
69 | FIX_HOLE, |
70 | #else |
70 | #else |
71 | #ifdef CONFIG_X86_VSYSCALL_EMULATION |
71 | #ifdef CONFIG_X86_VSYSCALL_EMULATION |
72 | VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, |
72 | VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, |
73 | #endif |
73 | #endif |
74 | #endif |
74 | #endif |
75 | FIX_DBGP_BASE, |
75 | FIX_DBGP_BASE, |
76 | FIX_EARLYCON_MEM_BASE, |
76 | FIX_EARLYCON_MEM_BASE, |
77 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
77 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
78 | FIX_OHCI1394_BASE, |
78 | FIX_OHCI1394_BASE, |
79 | #endif |
79 | #endif |
80 | #ifdef CONFIG_X86_LOCAL_APIC |
80 | #ifdef CONFIG_X86_LOCAL_APIC |
81 | FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ |
81 | FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ |
82 | #endif |
82 | #endif |
83 | #ifdef CONFIG_X86_IO_APIC |
83 | #ifdef CONFIG_X86_IO_APIC |
84 | FIX_IO_APIC_BASE_0, |
84 | FIX_IO_APIC_BASE_0, |
85 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, |
85 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, |
86 | #endif |
86 | #endif |
87 | FIX_RO_IDT, /* Virtual mapping for read-only IDT */ |
87 | FIX_RO_IDT, /* Virtual mapping for read-only IDT */ |
88 | #ifdef CONFIG_X86_32 |
88 | #ifdef CONFIG_X86_32 |
89 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ |
89 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ |
90 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, |
90 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, |
91 | #ifdef CONFIG_PCI_MMCONFIG |
91 | #ifdef CONFIG_PCI_MMCONFIG |
92 | FIX_PCIE_MCFG, |
92 | FIX_PCIE_MCFG, |
93 | #endif |
93 | #endif |
94 | #endif |
94 | #endif |
95 | #ifdef CONFIG_PARAVIRT |
95 | #ifdef CONFIG_PARAVIRT |
96 | FIX_PARAVIRT_BOOTMAP, |
96 | FIX_PARAVIRT_BOOTMAP, |
97 | #endif |
97 | #endif |
98 | FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */ |
98 | FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */ |
99 | FIX_TEXT_POKE0, /* first page is last, because allocation is backward */ |
99 | FIX_TEXT_POKE0, /* first page is last, because allocation is backward */ |
100 | #ifdef CONFIG_X86_INTEL_MID |
100 | #ifdef CONFIG_X86_INTEL_MID |
101 | FIX_LNW_VRTC, |
101 | FIX_LNW_VRTC, |
102 | #endif |
102 | #endif |
103 | __end_of_permanent_fixed_addresses, |
103 | __end_of_permanent_fixed_addresses, |
104 | 104 | ||
105 | /* |
105 | /* |
106 | * 512 temporary boot-time mappings, used by early_ioremap(), |
106 | * 512 temporary boot-time mappings, used by early_ioremap(), |
107 | * before ioremap() is functional. |
107 | * before ioremap() is functional. |
108 | * |
108 | * |
109 | * If necessary we round it up to the next 512 pages boundary so |
109 | * If necessary we round it up to the next 512 pages boundary so |
110 | * that we can have a single pgd entry and a single pte table: |
110 | * that we can have a single pgd entry and a single pte table: |
111 | */ |
111 | */ |
112 | #define NR_FIX_BTMAPS 64 |
112 | #define NR_FIX_BTMAPS 64 |
113 | #define FIX_BTMAPS_SLOTS 8 |
113 | #define FIX_BTMAPS_SLOTS 8 |
114 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |
114 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |
115 | FIX_BTMAP_END = |
115 | FIX_BTMAP_END = |
116 | (__end_of_permanent_fixed_addresses ^ |
116 | (__end_of_permanent_fixed_addresses ^ |
117 | (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) & |
117 | (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) & |
118 | -PTRS_PER_PTE |
118 | -PTRS_PER_PTE |
119 | ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - |
119 | ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - |
120 | (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1)) |
120 | (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1)) |
121 | : __end_of_permanent_fixed_addresses, |
121 | : __end_of_permanent_fixed_addresses, |
122 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, |
122 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, |
123 | #ifdef CONFIG_X86_32 |
123 | #ifdef CONFIG_X86_32 |
124 | FIX_WP_TEST, |
124 | FIX_WP_TEST, |
125 | #endif |
125 | #endif |
126 | #ifdef CONFIG_INTEL_TXT |
126 | #ifdef CONFIG_INTEL_TXT |
127 | FIX_TBOOT_BASE, |
127 | FIX_TBOOT_BASE, |
128 | #endif |
128 | #endif |
129 | __end_of_fixed_addresses |
129 | __end_of_fixed_addresses |
130 | }; |
130 | }; |
131 | 131 | ||
132 | 132 | ||
133 | extern void reserve_top_address(unsigned long reserve); |
133 | extern void reserve_top_address(unsigned long reserve); |
134 | 134 | ||
135 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) |
135 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) |
136 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
136 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
137 | 137 | ||
138 | extern int fixmaps_set; |
138 | extern int fixmaps_set; |
139 | 139 | ||
140 | extern pte_t *kmap_pte; |
140 | extern pte_t *kmap_pte; |
141 | extern pgprot_t kmap_prot; |
141 | #define kmap_prot PAGE_KERNEL |
142 | extern pte_t *pkmap_page_table; |
142 | extern pte_t *pkmap_page_table; |
143 | 143 | ||
144 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
144 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
145 | void native_set_fixmap(enum fixed_addresses idx, |
145 | void native_set_fixmap(enum fixed_addresses idx, |
146 | phys_addr_t phys, pgprot_t flags); |
146 | phys_addr_t phys, pgprot_t flags); |
147 | 147 | ||
148 | #ifndef CONFIG_PARAVIRT |
148 | #ifndef CONFIG_PARAVIRT |
149 | static inline void __set_fixmap(enum fixed_addresses idx, |
149 | static inline void __set_fixmap(enum fixed_addresses idx, |
150 | phys_addr_t phys, pgprot_t flags) |
150 | phys_addr_t phys, pgprot_t flags) |
151 | { |
151 | { |
152 | native_set_fixmap(idx, phys, flags); |
152 | native_set_fixmap(idx, phys, flags); |
153 | } |
153 | } |
154 | #endif |
154 | #endif |
155 | 155 | ||
156 | #include |
156 | #include |
157 | 157 | ||
158 | #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags) |
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)) |
159 | #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0)) |
160 | 160 | ||
161 | void __early_set_fixmap(enum fixed_addresses idx, |
161 | void __early_set_fixmap(enum fixed_addresses idx, |
162 | phys_addr_t phys, pgprot_t flags); |
162 | phys_addr_t phys, pgprot_t flags); |
163 | 163 | ||
164 | #endif /* !__ASSEMBLY__ */ |
164 | #endif /* !__ASSEMBLY__ */ |
165 | #endif /* _ASM_X86_FIXMAP_H */><> |
165 | #endif /* _ASM_X86_FIXMAP_H */><> |