arch/x86/include/asm/fixmap_64.h

   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_X86_FIXMAP_64_H
  12 #define _ASM_X86_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
  36 enum 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         __end_of_permanent_fixed_addresses,
  53 #ifdef CONFIG_ACPI
  54         FIX_ACPI_BEGIN,
  55         FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
  56 #endif
  57 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
  58         FIX_OHCI1394_BASE,
  59 #endif
  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 256 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_SLOTS        4
  69         FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 -
  70                         (__end_of_permanent_fixed_addresses & 255),
  71         FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_SLOTS - 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 /* _ASM_X86_FIXMAP_64_H */