arch/x86/include/asm/fixmap_32.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  * 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_32_H
  15 #define _ASM_X86_FIXMAP_32_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 #ifdef CONFIG_X86_32
  23 #include <linux/threads.h>
  24 #include <asm/kmap_types.h>
  25 #else
  26 #include <asm/vsyscall.h>
  27 #ifdef CONFIG_EFI
  28 #include <asm/efi.h>
  29 #endif
  30 #endif
  31
  32 /*
  33  * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
  34  * uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
  35  * Because of this, FIXADDR_TOP x86 integration was left as later work.
  36  */
  37 #ifdef CONFIG_X86_32
  38 /* used by vmalloc.c, vsyscall.lds.S.
  39  *
  40  * Leave one empty page between vmalloc'ed areas and
  41  * the start of the fixmap.
  42  */
  43 extern unsigned long __FIXADDR_TOP;
  44 #define FIXADDR_TOP     ((unsigned long)__FIXADDR_TOP)
  45
  46 #define FIXADDR_USER_START     __fix_to_virt(FIX_VDSO)
  47 #define FIXADDR_USER_END       __fix_to_virt(FIX_VDSO - 1)
  48 #else
  49 #define FIXADDR_TOP     (VSYSCALL_END-PAGE_SIZE)
  50
  51 /* Only covers 32bit vsyscalls currently. Need another set for 64bit. */
  52 #define FIXADDR_USER_START      ((unsigned long)VSYSCALL32_VSYSCALL)
  53 #define FIXADDR_USER_END        (FIXADDR_USER_START + PAGE_SIZE)
  54 #endif
  55
  56 /*
  57  * Here we define all the compile-time 'special' virtual
  58  * addresses. The point is to have a constant address at
  59  * compile time, but to set the physical address only
  60  * in the boot process.
  61  * for x86_32: We allocate these special addresses
  62  * from the end of virtual memory (0xfffff000) backwards.
  63  * Also this lets us do fail-safe vmalloc(), we
  64  * can guarantee that these special addresses and
  65  * vmalloc()-ed addresses never overlap.
  66  *
  67  * These 'compile-time allocated' memory buffers are
  68  * fixed-size 4k pages (or larger if used with an increment
  69  * higher than 1). Use set_fixmap(idx,phys) to associate
  70  * physical memory with fixmap indices.
  71  *
  72  * TLB entries of such buffers will not be flushed across
  73  * task switches.
  74  */
  75 enum fixed_addresses {
  76 #ifdef CONFIG_X86_32
  77         FIX_HOLE,
  78         FIX_VDSO,
  79 #else
  80         VSYSCALL_LAST_PAGE,
  81         VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE
  82                             + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
  83         VSYSCALL_HPET,
  84 #endif
  85         FIX_DBGP_BASE,
  86         FIX_EARLYCON_MEM_BASE,
  87 #ifdef CONFIG_X86_LOCAL_APIC
  88         FIX_APIC_BASE,  /* local (CPU) APIC) -- required for SMP or not */
  89 #endif
  90 #ifdef CONFIG_X86_IO_APIC
  91         FIX_IO_APIC_BASE_0,
  92         FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
  93 #endif
  94 #ifdef CONFIG_X86_64
  95 #ifdef CONFIG_EFI
  96         FIX_EFI_IO_MAP_LAST_PAGE,
  97         FIX_EFI_IO_MAP_FIRST_PAGE = FIX_EFI_IO_MAP_LAST_PAGE
  98                                   + MAX_EFI_IO_PAGES - 1,
  99 #endif
 100 #endif
 101 #ifdef CONFIG_X86_VISWS_APIC
 102         FIX_CO_CPU,     /* Cobalt timer */
 103         FIX_CO_APIC,    /* Cobalt APIC Redirection Table */
 104         FIX_LI_PCIA,    /* Lithium PCI Bridge A */
 105         FIX_LI_PCIB,    /* Lithium PCI Bridge B */
 106 #endif
 107 #ifdef CONFIG_X86_F00F_BUG
 108         FIX_F00F_IDT,   /* Virtual mapping for IDT */
 109 #endif
 110 #ifdef CONFIG_X86_CYCLONE_TIMER
 111         FIX_CYCLONE_TIMER, /*cyclone timer register*/
 112 #endif
 113 #ifdef CONFIG_X86_32
 114         FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
 115         FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
 116 #ifdef CONFIG_PCI_MMCONFIG
 117         FIX_PCIE_MCFG,
 118 #endif
 119 #endif
 120 #ifdef CONFIG_PARAVIRT
 121         FIX_PARAVIRT_BOOTMAP,
 122 #endif
 123         __end_of_permanent_fixed_addresses,
 124 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 125         FIX_OHCI1394_BASE,
 126 #endif
 127         /*
 128          * 256 temporary boot-time mappings, used by early_ioremap(),
 129          * before ioremap() is functional.
 130          *
 131          * We round it up to the next 256 pages boundary so that we
 132          * can have a single pgd entry and a single pte table:
 133          */
 134 #define NR_FIX_BTMAPS           64
 135 #define FIX_BTMAPS_SLOTS        4
 136         FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 -
 137                         (__end_of_permanent_fixed_addresses & 255),
 138         FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_SLOTS - 1,
 139 #ifdef CONFIG_X86_32
 140         FIX_WP_TEST,
 141 #endif
 142         __end_of_fixed_addresses
 143 };
 144
 145
 146 extern void reserve_top_address(unsigned long reserve);
 147
 148 #define FIXADDR_SIZE    (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
 149 #define FIXADDR_BOOT_SIZE       (__end_of_fixed_addresses << PAGE_SHIFT)
 150 #define FIXADDR_START           (FIXADDR_TOP - FIXADDR_SIZE)
 151 #define FIXADDR_BOOT_START      (FIXADDR_TOP - FIXADDR_BOOT_SIZE)
 152
 153 #endif /* !__ASSEMBLY__ */
 154 #endif /* _ASM_X86_FIXMAP_32_H */