/arch/x86/include/asm/pgtable_32_types.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35 · C++ Header · 55 lines · 33 code · 10 blank · 12 comment · 0 complexity · f5d0ad818f1c04192f98dafa51f8aa97 MD5 · raw file 

    

  1. #ifndef _ASM_X86_PGTABLE_32_DEFS_H
    2. 

  2. #define _ASM_X86_PGTABLE_32_DEFS_H
    3. 

  3. 

  4. /*
    5. 

  5.  * The Linux x86 paging architecture is 'compile-time dual-mode', it
    6. 

  6.  * implements both the traditional 2-level x86 page tables and the
    7. 

  7.  * newer 3-level PAE-mode page tables.
    8. 

  8.  */
    9. 

  9. #ifdef CONFIG_X86_PAE
    10. 

  10. # include <asm/pgtable-3level_types.h>
    11. 

  11. # define PMD_SIZE	(1UL << PMD_SHIFT)
    12. 

  12. # define PMD_MASK	(~(PMD_SIZE - 1))
    13. 

  13. #else
    14. 

  14. # include <asm/pgtable-2level_types.h>
    15. 

  15. #endif
    16. 

  16. 

  17. #define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
    18. 

  18. #define PGDIR_MASK	(~(PGDIR_SIZE - 1))
    19. 

  19. 

  20. /* Just any arbitrary offset to the start of the vmalloc VM area: the
    21. 

  21.  * current 8MB value just means that there will be a 8MB "hole" after the
    22. 

  22.  * physical memory until the kernel virtual memory starts.  That means that
    23. 

  23.  * any out-of-bounds memory accesses will hopefully be caught.
    24. 

  24.  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
    25. 

  25.  * area for the same reason. ;)
    26. 

  26.  */
    27. 

  27. #define VMALLOC_OFFSET	(8 * 1024 * 1024)
    28. 

  28. 

  29. #ifndef __ASSEMBLY__
    30. 

  30. extern bool __vmalloc_start_set; /* set once high_memory is set */
    31. 

  31. #endif
    32. 

  32. 

  33. #define VMALLOC_START	((unsigned long)high_memory + VMALLOC_OFFSET)
    34. 

  34. #ifdef CONFIG_X86_PAE
    35. 

  35. #define LAST_PKMAP 512
    36. 

  36. #else
    37. 

  37. #define LAST_PKMAP 1024
    38. 

  38. #endif
    39. 

  39. 

  40. #define PKMAP_BASE ((FIXADDR_BOOT_START - PAGE_SIZE * (LAST_PKMAP + 1))	\
    41. 

  41. 		    & PMD_MASK)
    42. 

  42. 

  43. #ifdef CONFIG_HIGHMEM
    44. 

  44. # define VMALLOC_END	(PKMAP_BASE - 2 * PAGE_SIZE)
    45. 

  45. #else
    46. 

  46. # define VMALLOC_END	(FIXADDR_START - 2 * PAGE_SIZE)
    47. 

  47. #endif
    48. 

  48. 

  49. #define MODULES_VADDR	VMALLOC_START
    50. 

  50. #define MODULES_END	VMALLOC_END
    51. 

  51. #define MODULES_LEN	(MODULES_VADDR - MODULES_END)
    52. 

  52. 

  53. #define MAXMEM	(VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE)
    54. 

  54. 

  55. #endif /* _ASM_X86_PGTABLE_32_DEFS_H */
    56.