blob: f1ac2b2167d7fdf0ba27c450d2c688f05c3b9e02 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
12
Ingo Molnar3ec96782008-04-25 18:25:25 +020013#ifndef _ASM_FIXMAP_32_H
14#define _ASM_FIXMAP_32_H
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17/* used by vmalloc.c, vsyscall.lds.S.
18 *
19 * Leave one empty page between vmalloc'ed areas and
20 * the start of the fixmap.
21 */
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -070022extern unsigned long __FIXADDR_TOP;
Jeremy Fitzhardinged4f7a2c2007-05-02 19:27:12 +020023#define FIXADDR_USER_START __fix_to_virt(FIX_VDSO)
24#define FIXADDR_USER_END __fix_to_virt(FIX_VDSO - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26#ifndef __ASSEMBLY__
27#include <linux/kernel.h>
28#include <asm/acpi.h>
29#include <asm/apicdef.h>
30#include <asm/page.h>
31#ifdef CONFIG_HIGHMEM
32#include <linux/threads.h>
33#include <asm/kmap_types.h>
34#endif
35
36/*
37 * Here we define all the compile-time 'special' virtual
38 * addresses. The point is to have a constant address at
39 * compile time, but to set the physical address only
40 * in the boot process. We allocate these special addresses
41 * from the end of virtual memory (0xfffff000) backwards.
42 * Also this lets us do fail-safe vmalloc(), we
43 * can guarantee that these special addresses and
44 * vmalloc()-ed addresses never overlap.
45 *
46 * these 'compile-time allocated' memory buffers are
47 * fixed-size 4k pages. (or larger if used with an increment
48 * highger than 1) use fixmap_set(idx,phys) to associate
49 * physical memory with fixmap indices.
50 *
51 * TLB entries of such buffers will not be flushed across
52 * task switches.
53 */
54enum fixed_addresses {
55 FIX_HOLE,
Ingo Molnare6e54942006-06-27 02:53:50 -070056 FIX_VDSO,
Yinghai Lu18a8bd92007-07-15 23:37:59 -070057 FIX_DBGP_BASE,
58 FIX_EARLYCON_MEM_BASE,
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#ifdef CONFIG_X86_LOCAL_APIC
60 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
61#endif
62#ifdef CONFIG_X86_IO_APIC
63 FIX_IO_APIC_BASE_0,
64 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
65#endif
66#ifdef CONFIG_X86_VISWS_APIC
67 FIX_CO_CPU, /* Cobalt timer */
Ingo Molnar1b42f512008-01-30 13:33:45 +010068 FIX_CO_APIC, /* Cobalt APIC Redirection Table */
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 FIX_LI_PCIA, /* Lithium PCI Bridge A */
70 FIX_LI_PCIB, /* Lithium PCI Bridge B */
71#endif
72#ifdef CONFIG_X86_F00F_BUG
73 FIX_F00F_IDT, /* Virtual mapping for IDT */
74#endif
75#ifdef CONFIG_X86_CYCLONE_TIMER
76 FIX_CYCLONE_TIMER, /*cyclone timer register*/
Ingo Molnar1b42f512008-01-30 13:33:45 +010077#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070078#ifdef CONFIG_HIGHMEM
79 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
80 FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
81#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#ifdef CONFIG_PCI_MMCONFIG
83 FIX_PCIE_MCFG,
84#endif
Jeremy Fitzhardinge90caccb2007-05-02 19:27:13 +020085#ifdef CONFIG_PARAVIRT
86 FIX_PARAVIRT_BOOTMAP,
87#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 __end_of_permanent_fixed_addresses,
Ingo Molnard701fda2008-01-30 13:33:48 +010089 /*
90 * 256 temporary boot-time mappings, used by early_ioremap(),
91 * before ioremap() is functional.
92 *
Jan Beulich48fe4a72008-07-18 13:29:00 +010093 * We round it up to the next 256 pages boundary so that we
Ingo Molnard701fda2008-01-30 13:33:48 +010094 * can have a single pgd entry and a single pte table:
95 */
Ingo Molnara8efa1c2008-01-30 13:33:45 +010096#define NR_FIX_BTMAPS 64
Ingo Molnar1b42f512008-01-30 13:33:45 +010097#define FIX_BTMAPS_NESTING 4
Jan Beulich48fe4a72008-07-18 13:29:00 +010098 FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 -
99 (__end_of_permanent_fixed_addresses & 255),
Ingo Molnar1b42f512008-01-30 13:33:45 +0100100 FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_NESTING - 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 FIX_WP_TEST,
Jan Beulich4c8ab982008-05-12 15:43:38 +0200102#ifdef CONFIG_ACPI
103 FIX_ACPI_BEGIN,
104 FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
105#endif
Bernhard Kaindlf212ec42008-01-30 13:34:11 +0100106#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
107 FIX_OHCI1394_BASE,
108#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 __end_of_fixed_addresses
110};
111
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -0700112extern void reserve_top_address(unsigned long reserve);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
116
117#define __FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
118#define __FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
119#define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE)
120#define FIXADDR_BOOT_START (FIXADDR_TOP - __FIXADDR_BOOT_SIZE)
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122#endif /* !__ASSEMBLY__ */
123#endif