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 | /* |
18 | * Exposed to assembly code for setting up initial page tables. Cannot be |
19 | * calculated in assembly code (fixmap entries are an enum), but is sanity |
20 | * checked in the actual fixmap C code to make sure that the fixmap is |
21 | * covered fully. |
22 | */ |
23 | #define FIXMAP_PMD_NUM 2 |
24 | /* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */ |
25 | #define FIXMAP_PMD_TOP 507 |
26 | |
27 | #ifndef __ASSEMBLY__ |
28 | #include <linux/kernel.h> |
29 | #include <asm/acpi.h> |
30 | #include <asm/apicdef.h> |
31 | #include <asm/page.h> |
32 | #ifdef CONFIG_X86_32 |
33 | #include <linux/threads.h> |
34 | #include <asm/kmap_types.h> |
35 | #else |
36 | #include <uapi/asm/vsyscall.h> |
37 | #endif |
38 | |
39 | /* |
40 | * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall |
41 | * uses fixmaps that relies on FIXADDR_TOP for proper address calculation. |
42 | * Because of this, FIXADDR_TOP x86 integration was left as later work. |
43 | */ |
44 | #ifdef CONFIG_X86_32 |
45 | /* used by vmalloc.c, vsyscall.lds.S. |
46 | * |
47 | * Leave one empty page between vmalloc'ed areas and |
48 | * the start of the fixmap. |
49 | */ |
50 | extern unsigned long __FIXADDR_TOP; |
51 | #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) |
52 | #else |
53 | #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \ |
54 | PAGE_SIZE) |
55 | #endif |
56 | |
57 | /* |
58 | * Here we define all the compile-time 'special' virtual |
59 | * addresses. The point is to have a constant address at |
60 | * compile time, but to set the physical address only |
61 | * in the boot process. |
62 | * for x86_32: We allocate these special addresses |
63 | * from the end of virtual memory (0xfffff000) backwards. |
64 | * Also this lets us do fail-safe vmalloc(), we |
65 | * can guarantee that these special addresses and |
66 | * vmalloc()-ed addresses never overlap. |
67 | * |
68 | * These 'compile-time allocated' memory buffers are |
69 | * fixed-size 4k pages (or larger if used with an increment |
70 | * higher than 1). Use set_fixmap(idx,phys) to associate |
71 | * physical memory with fixmap indices. |
72 | * |
73 | * TLB entries of such buffers will not be flushed across |
74 | * task switches. |
75 | */ |
76 | enum fixed_addresses { |
77 | #ifdef CONFIG_X86_32 |
78 | FIX_HOLE, |
79 | #else |
80 | #ifdef CONFIG_X86_VSYSCALL_EMULATION |
81 | VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, |
82 | #endif |
83 | #endif |
84 | FIX_DBGP_BASE, |
85 | FIX_EARLYCON_MEM_BASE, |
86 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
87 | FIX_OHCI1394_BASE, |
88 | #endif |
89 | #ifdef CONFIG_X86_LOCAL_APIC |
90 | FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ |
91 | #endif |
92 | #ifdef CONFIG_X86_IO_APIC |
93 | FIX_IO_APIC_BASE_0, |
94 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, |
95 | #endif |
96 | #ifdef CONFIG_X86_32 |
97 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ |
98 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, |
99 | #ifdef CONFIG_PCI_MMCONFIG |
100 | FIX_PCIE_MCFG, |
101 | #endif |
102 | #endif |
103 | #ifdef CONFIG_PARAVIRT |
104 | FIX_PARAVIRT_BOOTMAP, |
105 | #endif |
106 | FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */ |
107 | FIX_TEXT_POKE0, /* first page is last, because allocation is backward */ |
108 | #ifdef CONFIG_X86_INTEL_MID |
109 | FIX_LNW_VRTC, |
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 pgd 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 *kmap_pte; |
158 | #define kmap_prot PAGE_KERNEL |
159 | extern pte_t *pkmap_page_table; |
160 | |
161 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
162 | void native_set_fixmap(enum fixed_addresses idx, |
163 | phys_addr_t phys, pgprot_t flags); |
164 | |
165 | #ifndef CONFIG_PARAVIRT_XXL |
166 | static inline void __set_fixmap(enum fixed_addresses idx, |
167 | phys_addr_t phys, pgprot_t flags) |
168 | { |
169 | native_set_fixmap(idx, phys, flags); |
170 | } |
171 | #endif |
172 | |
173 | /* |
174 | * FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not |
175 | * supported for MMIO addresses, so make sure that the memory encryption |
176 | * mask is not part of the page attributes. |
177 | */ |
178 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE |
179 | |
180 | /* |
181 | * Early memremap routines used for in-place encryption. The mappings created |
182 | * by these routines are intended to be used as temporary mappings. |
183 | */ |
184 | void __init *early_memremap_encrypted(resource_size_t phys_addr, |
185 | unsigned long size); |
186 | void __init *early_memremap_encrypted_wp(resource_size_t phys_addr, |
187 | unsigned long size); |
188 | void __init *early_memremap_decrypted(resource_size_t phys_addr, |
189 | unsigned long size); |
190 | void __init *early_memremap_decrypted_wp(resource_size_t phys_addr, |
191 | unsigned long size); |
192 | |
193 | #include <asm-generic/fixmap.h> |
194 | |
195 | #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags) |
196 | #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0)) |
197 | |
198 | void __early_set_fixmap(enum fixed_addresses idx, |
199 | phys_addr_t phys, pgprot_t flags); |
200 | |
201 | #endif /* !__ASSEMBLY__ */ |
202 | #endif /* _ASM_X86_FIXMAP_H */ |
203 | |