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 */
193