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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
Ingo Molnar3ec96782008-04-25 18:25:25 +020011#ifndef _ASM_FIXMAP_64_H
12#define _ASM_FIXMAP_64_H
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/kernel.h>
15#include <asm/apicdef.h>
16#include <asm/page.h>
17#include <asm/vsyscall.h>
Huang, Ying5b836832008-01-30 13:31:19 +010018#include <asm/efi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20/*
21 * Here we define all the compile-time 'special' virtual
22 * addresses. The point is to have a constant address at
23 * compile time, but to set the physical address only
24 * in the boot process.
25 *
Jiri Kosinabdb345a2007-07-21 17:11:21 +020026 * These 'compile-time allocated' memory buffers are
27 * fixed-size 4k pages (or larger if used with an increment
28 * higher than 1). Use set_fixmap(idx,phys) to associate
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 * physical memory with fixmap indices.
30 *
31 * TLB entries of such buffers will not be flushed across
32 * task switches.
33 */
34
35enum fixed_addresses {
36 VSYSCALL_LAST_PAGE,
Joe Perchesdca13fb2008-03-23 01:02:10 -070037 VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE
38 + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 VSYSCALL_HPET,
Yinghai Lu18a8bd92007-07-15 23:37:59 -070040 FIX_DBGP_BASE,
41 FIX_EARLYCON_MEM_BASE,
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 FIX_HPET_BASE,
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 FIX_IO_APIC_BASE_0,
Joe Perchesdca13fb2008-03-23 01:02:10 -070045 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
Huang, Ying5b836832008-01-30 13:31:19 +010046 FIX_EFI_IO_MAP_LAST_PAGE,
Joe Perchesdca13fb2008-03-23 01:02:10 -070047 FIX_EFI_IO_MAP_FIRST_PAGE = FIX_EFI_IO_MAP_LAST_PAGE
48 + MAX_EFI_IO_PAGES - 1,
Bernhard Kaindlf212ec42008-01-30 13:34:11 +010049#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
50 FIX_OHCI1394_BASE,
51#endif
Jeremy Fitzhardinge4583ed52008-06-25 00:19:03 -040052 __end_of_permanent_fixed_addresses,
53 /*
54 * 256 temporary boot-time mappings, used by early_ioremap(),
55 * before ioremap() is functional.
56 *
57 * We round it up to the next 512 pages boundary so that we
58 * can have a single pgd entry and a single pte table:
59 */
60#define NR_FIX_BTMAPS 64
61#define FIX_BTMAPS_NESTING 4
62 FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 512 -
63 (__end_of_permanent_fixed_addresses & 511),
64 FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_NESTING - 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 __end_of_fixed_addresses
66};
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE)
69#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
70#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
71
72/* Only covers 32bit vsyscalls currently. Need another set for 64bit. */
73#define FIXADDR_USER_START ((unsigned long)VSYSCALL32_VSYSCALL)
74#define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE)
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#endif