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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
11#ifndef _ASM_FIXMAP_64_H
12#define _ASM_FIXMAP_64_H
13
14#include <linux/kernel.h>
15#include <asm/acpi.h>
16#include <asm/apicdef.h>
17#include <asm/page.h>
18#include <asm/vsyscall.h>
19#include <asm/efi.h>
20
21/*
22 * Here we define all the compile-time 'special' virtual
23 * addresses. The point is to have a constant address at
24 * compile time, but to set the physical address only
25 * in the boot process.
26 *
27 * These 'compile-time allocated' memory buffers are
28 * fixed-size 4k pages (or larger if used with an increment
29 * higher than 1). Use set_fixmap(idx,phys) to associate
30 * physical memory with fixmap indices.
31 *
32 * TLB entries of such buffers will not be flushed across
33 * task switches.
34 */
35
36enum fixed_addresses {
37 VSYSCALL_LAST_PAGE,
38 VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE
39 + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
40 VSYSCALL_HPET,
41 FIX_DBGP_BASE,
42 FIX_EARLYCON_MEM_BASE,
43 FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
44 FIX_IO_APIC_BASE_0,
45 FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
46 FIX_EFI_IO_MAP_LAST_PAGE,
47 FIX_EFI_IO_MAP_FIRST_PAGE = FIX_EFI_IO_MAP_LAST_PAGE
48 + MAX_EFI_IO_PAGES - 1,
49#ifdef CONFIG_PARAVIRT
50 FIX_PARAVIRT_BOOTMAP,
51#endif
52#ifdef CONFIG_ACPI
53 FIX_ACPI_BEGIN,
54 FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
55#endif
56#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
57 FIX_OHCI1394_BASE,
58#endif
59 __end_of_permanent_fixed_addresses,
60 /*
61 * 256 temporary boot-time mappings, used by early_ioremap(),
62 * before ioremap() is functional.
63 *
64 * We round it up to the next 512 pages boundary so that we
65 * can have a single pgd entry and a single pte table:
66 */
67#define NR_FIX_BTMAPS 64
68#define FIX_BTMAPS_NESTING 4
69 FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 512 -
70 (__end_of_permanent_fixed_addresses & 511),
71 FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_NESTING - 1,
72 __end_of_fixed_addresses
73};
74
75#define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE)
76#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
77#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
78
79/* Only covers 32bit vsyscalls currently. Need another set for 64bit. */
80#define FIXADDR_USER_START ((unsigned long)VSYSCALL32_VSYSCALL)
81#define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE)
82
83#endif