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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#include <asm/pvclock.h>
23#ifdef CONFIG_X86_32
24#include <linux/threads.h>
25#include <asm/kmap_types.h>
26#else
27#include <uapi/asm/vsyscall.h>
28#endif
29
30/*
31 * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
32 * uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
33 * Because of this, FIXADDR_TOP x86 integration was left as later work.
34 */
35#ifdef CONFIG_X86_32
36/* used by vmalloc.c, vsyscall.lds.S.
37 *
38 * Leave one empty page between vmalloc'ed areas and
39 * the start of the fixmap.
40 */
41extern unsigned long __FIXADDR_TOP;
42#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
43#else
44#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
45 PAGE_SIZE)
46#endif
47
48
49/*
50 * Here we define all the compile-time 'special' virtual
51 * addresses. The point is to have a constant address at
52 * compile time, but to set the physical address only
53 * in the boot process.
54 * for x86_32: We allocate these special addresses
55 * from the end of virtual memory (0xfffff000) backwards.
56 * Also this lets us do fail-safe vmalloc(), we
57 * can guarantee that these special addresses and
58 * vmalloc()-ed addresses never overlap.
59 *
60 * These 'compile-time allocated' memory buffers are
61 * fixed-size 4k pages (or larger if used with an increment
62 * higher than 1). Use set_fixmap(idx,phys) to associate
63 * physical memory with fixmap indices.
64 *
65 * TLB entries of such buffers will not be flushed across
66 * task switches.
67 */
68enum fixed_addresses {
69#ifdef CONFIG_X86_32
70 FIX_HOLE,
71#else
72 VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
73#ifdef CONFIG_PARAVIRT_CLOCK
74 PVCLOCK_FIXMAP_BEGIN,
75 PVCLOCK_FIXMAP_END = PVCLOCK_FIXMAP_BEGIN+PVCLOCK_VSYSCALL_NR_PAGES-1,
76#endif
77#endif
78 FIX_DBGP_BASE,
79 FIX_EARLYCON_MEM_BASE,
80#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
81 FIX_OHCI1394_BASE,
82#endif
83#ifdef CONFIG_X86_LOCAL_APIC
84 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
85#endif
86#ifdef CONFIG_X86_IO_APIC
87 FIX_IO_APIC_BASE_0,
88 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
89#endif
90 FIX_RO_IDT, /* Virtual mapping for read-only IDT */
91#ifdef CONFIG_X86_32
92 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
93 FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
94#ifdef CONFIG_PCI_MMCONFIG
95 FIX_PCIE_MCFG,
96#endif
97#endif
98#ifdef CONFIG_PARAVIRT
99 FIX_PARAVIRT_BOOTMAP,
100#endif
101 FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */
102 FIX_TEXT_POKE0, /* first page is last, because allocation is backward */
103#ifdef CONFIG_X86_INTEL_MID
104 FIX_LNW_VRTC,
105#endif
106 __end_of_permanent_fixed_addresses,
107
108 /*
109 * 256 temporary boot-time mappings, used by early_ioremap(),
110 * before ioremap() is functional.
111 *
112 * If necessary we round it up to the next 256 pages boundary so
113 * that we can have a single pgd entry and a single pte table:
114 */
115#define NR_FIX_BTMAPS 64
116#define FIX_BTMAPS_SLOTS 4
117#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
118 FIX_BTMAP_END =
119 (__end_of_permanent_fixed_addresses ^
120 (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
121 -PTRS_PER_PTE
122 ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
123 (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
124 : __end_of_permanent_fixed_addresses,
125 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
126#ifdef CONFIG_X86_32
127 FIX_WP_TEST,
128#endif
129#ifdef CONFIG_INTEL_TXT
130 FIX_TBOOT_BASE,
131#endif
132 __end_of_fixed_addresses
133};
134
135
136extern void reserve_top_address(unsigned long reserve);
137
138#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
139#define FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
140#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
141#define FIXADDR_BOOT_START (FIXADDR_TOP - FIXADDR_BOOT_SIZE)
142
143extern int fixmaps_set;
144
145extern pte_t *kmap_pte;
146extern pgprot_t kmap_prot;
147extern pte_t *pkmap_page_table;
148
149void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
150void native_set_fixmap(enum fixed_addresses idx,
151 phys_addr_t phys, pgprot_t flags);
152
153#ifndef CONFIG_PARAVIRT
154static inline void __set_fixmap(enum fixed_addresses idx,
155 phys_addr_t phys, pgprot_t flags)
156{
157 native_set_fixmap(idx, phys, flags);
158}
159#endif
160
161#include <asm-generic/fixmap.h>
162
163#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
164#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
165
166void __early_set_fixmap(enum fixed_addresses idx,
167 phys_addr_t phys, pgprot_t flags);
168
169#endif /* !__ASSEMBLY__ */
170#endif /* _ASM_X86_FIXMAP_H */