fixmap_64.h 1.8 KB

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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. #ifndef _ASM_FIXMAP_64_H
  11. #define _ASM_FIXMAP_64_H
  12. #include <linux/kernel.h>
  13. #include <asm/apicdef.h>
  14. #include <asm/page.h>
  15. #include <asm/vsyscall.h>
  16. #include <asm/efi.h>
  17. /*
  18. * Here we define all the compile-time 'special' virtual
  19. * addresses. The point is to have a constant address at
  20. * compile time, but to set the physical address only
  21. * in the boot process.
  22. *
  23. * These 'compile-time allocated' memory buffers are
  24. * fixed-size 4k pages (or larger if used with an increment
  25. * higher than 1). Use set_fixmap(idx,phys) to associate
  26. * physical memory with fixmap indices.
  27. *
  28. * TLB entries of such buffers will not be flushed across
  29. * task switches.
  30. */
  31. enum fixed_addresses {
  32. VSYSCALL_LAST_PAGE,
  33. VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE
  34. + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
  35. VSYSCALL_HPET,
  36. FIX_DBGP_BASE,
  37. FIX_EARLYCON_MEM_BASE,
  38. FIX_HPET_BASE,
  39. FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
  40. FIX_IO_APIC_BASE_0,
  41. FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
  42. FIX_EFI_IO_MAP_LAST_PAGE,
  43. FIX_EFI_IO_MAP_FIRST_PAGE = FIX_EFI_IO_MAP_LAST_PAGE
  44. + MAX_EFI_IO_PAGES - 1,
  45. #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
  46. FIX_OHCI1394_BASE,
  47. #endif
  48. __end_of_fixed_addresses
  49. };
  50. #define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE)
  51. #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
  52. #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
  53. /* Only covers 32bit vsyscalls currently. Need another set for 64bit. */
  54. #define FIXADDR_USER_START ((unsigned long)VSYSCALL32_VSYSCALL)
  55. #define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE)
  56. #endif