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 | static inline void __set_fixmap(enum fixed_addresses idx, |
165 | phys_addr_t phys, pgprot_t flags) |
166 | { |
167 | 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 */ |
201 | |