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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#ifndef __ASSEMBLY__
18#include <linux/kernel.h>
19#include <asm/acpi.h>
20#include <asm/apicdef.h>
21#include <asm/page.h>
22#ifdef CONFIG_X86_32
23#include <linux/threads.h>
24#include <asm/kmap_types.h>
25#else
26#include <uapi/asm/vsyscall.h>
27#endif
28
29/*
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.
32 * Because of this, FIXADDR_TOP x86 integration was left as later work.
33 */
34#ifdef CONFIG_X86_32
35/* used by vmalloc.c, vsyscall.lds.S.
36 *
37 * Leave one empty page between vmalloc'ed areas and
38 * the start of the fixmap.
39 */
40extern unsigned long __FIXADDR_TOP;
41#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
42#else
43#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
44 PAGE_SIZE)
45#endif
46
47/*
48 * Here we define all the compile-time 'special' virtual
49 * addresses. The point is to have a constant address at
50 * compile time, but to set the physical address only
51 * in the boot process.
52 * for x86_32: We allocate these special addresses
53 * from the end of virtual memory (0xfffff000) backwards.
54 * Also this lets us do fail-safe vmalloc(), we
55 * can guarantee that these special addresses and
56 * vmalloc()-ed addresses never overlap.
57 *
58 * These 'compile-time allocated' memory buffers are
59 * fixed-size 4k pages (or larger if used with an increment
60 * higher than 1). Use set_fixmap(idx,phys) to associate
61 * physical memory with fixmap indices.
62 *
63 * TLB entries of such buffers will not be flushed across
64 * task switches.
65 */
66enum fixed_addresses {
67#ifdef CONFIG_X86_32
68 FIX_HOLE,
69#else
70#ifdef CONFIG_X86_VSYSCALL_EMULATION
71 VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
72#endif
73#endif
74 FIX_DBGP_BASE,
75 FIX_EARLYCON_MEM_BASE,
76#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
77 FIX_OHCI1394_BASE,
78#endif
79#ifdef CONFIG_X86_LOCAL_APIC
80 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
81#endif
82#ifdef CONFIG_X86_IO_APIC
83 FIX_IO_APIC_BASE_0,
84 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
85#endif
86#ifdef CONFIG_X86_32
87 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
88 FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
89#ifdef CONFIG_PCI_MMCONFIG
90 FIX_PCIE_MCFG,
91#endif
92#endif
93#ifdef CONFIG_PARAVIRT
94 FIX_PARAVIRT_BOOTMAP,
95#endif
96 FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */
97 FIX_TEXT_POKE0, /* first page is last, because allocation is backward */
98#ifdef CONFIG_X86_INTEL_MID
99 FIX_LNW_VRTC,
100#endif
101
102#ifdef CONFIG_ACPI_APEI_GHES
103 /* Used for GHES mapping from assorted contexts */
104 FIX_APEI_GHES_IRQ,
105 FIX_APEI_GHES_NMI,
106#endif
107
108 __end_of_permanent_fixed_addresses,
109
110 /*
111 * 512 temporary boot-time mappings, used by early_ioremap(),
112 * before ioremap() is functional.
113 *
114 * If necessary we round it up to the next 512 pages boundary so
115 * that we can have a single pgd entry and a single pte table:
116 */
117#define NR_FIX_BTMAPS 64
118#define FIX_BTMAPS_SLOTS 8
119#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
120 FIX_BTMAP_END =
121 (__end_of_permanent_fixed_addresses ^
122 (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
123 -PTRS_PER_PTE
124 ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
125 (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
126 : __end_of_permanent_fixed_addresses,
127 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
128#ifdef CONFIG_X86_32
129 FIX_WP_TEST,
130#endif
131#ifdef CONFIG_INTEL_TXT
132 FIX_TBOOT_BASE,
133#endif
134 __end_of_fixed_addresses
135};
136
137
138extern void reserve_top_address(unsigned long reserve);
139
140#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
141#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
142#define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
143#define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE)
144
145extern int fixmaps_set;
146
147extern pte_t *kmap_pte;
148#define kmap_prot PAGE_KERNEL
149extern pte_t *pkmap_page_table;
150
151void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
152void native_set_fixmap(enum fixed_addresses idx,
153 phys_addr_t phys, pgprot_t flags);
154
155#ifndef CONFIG_PARAVIRT
156static inline void __set_fixmap(enum fixed_addresses idx,
157 phys_addr_t phys, pgprot_t flags)
158{
159 native_set_fixmap(idx, phys, flags);
160}
161#endif
162
163/*
164 * FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not
165 * supported for MMIO addresses, so make sure that the memory encryption
166 * mask is not part of the page attributes.
167 */
168#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE
169
170/*
171 * Early memremap routines used for in-place encryption. The mappings created
172 * by these routines are intended to be used as temporary mappings.
173 */
174void __init *early_memremap_encrypted(resource_size_t phys_addr,
175 unsigned long size);
176void __init *early_memremap_encrypted_wp(resource_size_t phys_addr,
177 unsigned long size);
178void __init *early_memremap_decrypted(resource_size_t phys_addr,
179 unsigned long size);
180void __init *early_memremap_decrypted_wp(resource_size_t phys_addr,
181 unsigned long size);
182
183#include <asm-generic/fixmap.h>
184
185#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
186#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
187
188void __early_set_fixmap(enum fixed_addresses idx,
189 phys_addr_t phys, pgprot_t flags);
190
191#endif /* !__ASSEMBLY__ */
192#endif /* _ASM_X86_FIXMAP_H */
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/*
46 * Leave one empty page between vmalloc'ed areas and
47 * the start of the fixmap.
48 */
49extern unsigned long __FIXADDR_TOP;
50#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
51#else
52#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
53 PAGE_SIZE)
54#endif
55
56/*
57 * Here we define all the compile-time 'special' virtual
58 * addresses. The point is to have a constant address at
59 * compile time, but to set the physical address only
60 * in the boot process.
61 * for x86_32: We allocate these special addresses
62 * from the end of virtual memory (0xfffff000) backwards.
63 * Also this lets us do fail-safe vmalloc(), we
64 * can guarantee that these special addresses and
65 * vmalloc()-ed addresses never overlap.
66 *
67 * These 'compile-time allocated' memory buffers are
68 * fixed-size 4k pages (or larger if used with an increment
69 * higher than 1). Use set_fixmap(idx,phys) to associate
70 * physical memory with fixmap indices.
71 *
72 * TLB entries of such buffers will not be flushed across
73 * task switches.
74 */
75enum fixed_addresses {
76#ifdef CONFIG_X86_32
77 FIX_HOLE,
78#else
79#ifdef CONFIG_X86_VSYSCALL_EMULATION
80 VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
81#endif
82#endif
83 FIX_DBGP_BASE,
84 FIX_EARLYCON_MEM_BASE,
85#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
86 FIX_OHCI1394_BASE,
87#endif
88#ifdef CONFIG_X86_LOCAL_APIC
89 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
90#endif
91#ifdef CONFIG_X86_IO_APIC
92 FIX_IO_APIC_BASE_0,
93 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
94#endif
95#ifdef CONFIG_X86_32
96 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
97 FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
98#ifdef CONFIG_PCI_MMCONFIG
99 FIX_PCIE_MCFG,
100#endif
101#endif
102#ifdef CONFIG_PARAVIRT
103 FIX_PARAVIRT_BOOTMAP,
104#endif
105#ifdef CONFIG_X86_INTEL_MID
106 FIX_LNW_VRTC,
107#endif
108
109#ifdef CONFIG_ACPI_APEI_GHES
110 /* Used for GHES mapping from assorted contexts */
111 FIX_APEI_GHES_IRQ,
112 FIX_APEI_GHES_NMI,
113#endif
114
115 __end_of_permanent_fixed_addresses,
116
117 /*
118 * 512 temporary boot-time mappings, used by early_ioremap(),
119 * before ioremap() is functional.
120 *
121 * If necessary we round it up to the next 512 pages boundary so
122 * that we can have a single pmd entry and a single pte table:
123 */
124#define NR_FIX_BTMAPS 64
125#define FIX_BTMAPS_SLOTS 8
126#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
127 FIX_BTMAP_END =
128 (__end_of_permanent_fixed_addresses ^
129 (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
130 -PTRS_PER_PTE
131 ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
132 (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
133 : __end_of_permanent_fixed_addresses,
134 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
135#ifdef CONFIG_X86_32
136 FIX_WP_TEST,
137#endif
138#ifdef CONFIG_INTEL_TXT
139 FIX_TBOOT_BASE,
140#endif
141 __end_of_fixed_addresses
142};
143
144
145extern void reserve_top_address(unsigned long reserve);
146
147#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
148#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
149#define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
150#define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE)
151
152extern int fixmaps_set;
153
154extern pte_t *kmap_pte;
155#define kmap_prot PAGE_KERNEL
156extern pte_t *pkmap_page_table;
157
158void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
159void native_set_fixmap(enum fixed_addresses idx,
160 phys_addr_t phys, pgprot_t flags);
161
162#ifndef CONFIG_PARAVIRT_XXL
163static inline void __set_fixmap(enum fixed_addresses idx,
164 phys_addr_t phys, pgprot_t flags)
165{
166 native_set_fixmap(idx, phys, flags);
167}
168#endif
169
170/*
171 * FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not
172 * supported for MMIO addresses, so make sure that the memory encryption
173 * mask is not part of the page attributes.
174 */
175#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE
176
177/*
178 * Early memremap routines used for in-place encryption. The mappings created
179 * by these routines are intended to be used as temporary mappings.
180 */
181void __init *early_memremap_encrypted(resource_size_t phys_addr,
182 unsigned long size);
183void __init *early_memremap_encrypted_wp(resource_size_t phys_addr,
184 unsigned long size);
185void __init *early_memremap_decrypted(resource_size_t phys_addr,
186 unsigned long size);
187void __init *early_memremap_decrypted_wp(resource_size_t phys_addr,
188 unsigned long size);
189
190#include <asm-generic/fixmap.h>
191
192#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
193#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
194
195void __early_set_fixmap(enum fixed_addresses idx,
196 phys_addr_t phys, pgprot_t flags);
197
198#endif /* !__ASSEMBLY__ */
199#endif /* _ASM_X86_FIXMAP_H */