Line data Source code
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 :
14 : #ifndef _ASM_X86_FIXMAP_H
15 : #define _ASM_X86_FIXMAP_H
16 :
17 : #include <asm/kmap_size.h>
18 :
19 : /*
20 : * Exposed to assembly code for setting up initial page tables. Cannot be
21 : * calculated in assembly code (fixmap entries are an enum), but is sanity
22 : * checked in the actual fixmap C code to make sure that the fixmap is
23 : * covered fully.
24 : */
25 : #ifndef CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP
26 : # define FIXMAP_PMD_NUM 2
27 : #else
28 : # define KM_PMDS (KM_MAX_IDX * ((CONFIG_NR_CPUS + 511) / 512))
29 : # define FIXMAP_PMD_NUM (KM_PMDS + 2)
30 : #endif
31 : /* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */
32 : #define FIXMAP_PMD_TOP 507
33 :
34 : #ifndef __ASSEMBLY__
35 : #include <linux/kernel.h>
36 : #include <asm/apicdef.h>
37 : #include <asm/page.h>
38 : #include <asm/pgtable_types.h>
39 : #ifdef CONFIG_X86_32
40 : #include <linux/threads.h>
41 : #else
42 : #include <uapi/asm/vsyscall.h>
43 : #endif
44 :
45 : /*
46 : * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
47 : * uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
48 : * Because of this, FIXADDR_TOP x86 integration was left as later work.
49 : */
50 : #ifdef CONFIG_X86_32
51 : /*
52 : * Leave one empty page between vmalloc'ed areas and
53 : * the start of the fixmap.
54 : */
55 : extern unsigned long __FIXADDR_TOP;
56 : #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
57 : #else
58 : #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
59 : PAGE_SIZE)
60 : #endif
61 :
62 : /*
63 : * Here we define all the compile-time 'special' virtual
64 : * addresses. The point is to have a constant address at
65 : * compile time, but to set the physical address only
66 : * in the boot process.
67 : * for x86_32: We allocate these special addresses
68 : * from the end of virtual memory (0xfffff000) backwards.
69 : * Also this lets us do fail-safe vmalloc(), we
70 : * can guarantee that these special addresses and
71 : * vmalloc()-ed addresses never overlap.
72 : *
73 : * These 'compile-time allocated' memory buffers are
74 : * fixed-size 4k pages (or larger if used with an increment
75 : * higher than 1). Use set_fixmap(idx,phys) to associate
76 : * physical memory with fixmap indices.
77 : *
78 : * TLB entries of such buffers will not be flushed across
79 : * task switches.
80 : */
81 : enum fixed_addresses {
82 : #ifdef CONFIG_X86_32
83 : FIX_HOLE,
84 : #else
85 : #ifdef CONFIG_X86_VSYSCALL_EMULATION
86 : VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
87 : #endif
88 : #endif
89 : FIX_DBGP_BASE,
90 : FIX_EARLYCON_MEM_BASE,
91 : #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
92 : FIX_OHCI1394_BASE,
93 : #endif
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
101 : #ifdef CONFIG_KMAP_LOCAL
102 : FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
103 : FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1,
104 : #ifdef CONFIG_PCI_MMCONFIG
105 : FIX_PCIE_MCFG,
106 : #endif
107 : #endif
108 : #ifdef CONFIG_PARAVIRT_XXL
109 : FIX_PARAVIRT_BOOTMAP,
110 : #endif
111 :
112 : #ifdef CONFIG_ACPI_APEI_GHES
113 : /* Used for GHES mapping from assorted contexts */
114 : FIX_APEI_GHES_IRQ,
115 : FIX_APEI_GHES_NMI,
116 : #endif
117 :
118 : __end_of_permanent_fixed_addresses,
119 :
120 : /*
121 : * 512 temporary boot-time mappings, used by early_ioremap(),
122 : * before ioremap() is functional.
123 : *
124 : * If necessary we round it up to the next 512 pages boundary so
125 : * that we can have a single pmd entry and a single pte table:
126 : */
127 : #define NR_FIX_BTMAPS 64
128 : #define FIX_BTMAPS_SLOTS 8
129 : #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
130 : FIX_BTMAP_END =
131 : (__end_of_permanent_fixed_addresses ^
132 : (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
133 : -PTRS_PER_PTE
134 : ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
135 : (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
136 : : __end_of_permanent_fixed_addresses,
137 : FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
138 : #ifdef CONFIG_X86_32
139 : FIX_WP_TEST,
140 : #endif
141 : #ifdef CONFIG_INTEL_TXT
142 : FIX_TBOOT_BASE,
143 : #endif
144 : __end_of_fixed_addresses
145 : };
146 :
147 :
148 : extern void reserve_top_address(unsigned long reserve);
149 :
150 : #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
151 : #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
152 : #define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
153 : #define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE)
154 :
155 : extern int fixmaps_set;
156 :
157 : extern pte_t *pkmap_page_table;
158 :
159 : void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
160 : void native_set_fixmap(unsigned /* enum fixed_addresses */ idx,
161 : phys_addr_t phys, pgprot_t flags);
162 :
163 : #ifndef CONFIG_PARAVIRT_XXL
164 3 : static inline void __set_fixmap(enum fixed_addresses idx,
165 : phys_addr_t phys, pgprot_t flags)
166 : {
167 3 : native_set_fixmap(idx, phys, flags);
168 : }
169 : #endif
170 :
171 : /*
172 : * FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not
173 : * supported for MMIO addresses, so make sure that the memory encryption
174 : * mask is not part of the page attributes.
175 : */
176 : #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE
177 :
178 : /*
179 : * Early memremap routines used for in-place encryption. The mappings created
180 : * by these routines are intended to be used as temporary mappings.
181 : */
182 : void __init *early_memremap_encrypted(resource_size_t phys_addr,
183 : unsigned long size);
184 : void __init *early_memremap_encrypted_wp(resource_size_t phys_addr,
185 : unsigned long size);
186 : void __init *early_memremap_decrypted(resource_size_t phys_addr,
187 : unsigned long size);
188 : void __init *early_memremap_decrypted_wp(resource_size_t phys_addr,
189 : unsigned long size);
190 :
191 : #include <asm-generic/fixmap.h>
192 :
193 : #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
194 : #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
195 :
196 : void __early_set_fixmap(enum fixed_addresses idx,
197 : phys_addr_t phys, pgprot_t flags);
198 :
199 : #endif /* !__ASSEMBLY__ */
200 : #endif /* _ASM_X86_FIXMAP_H */
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