release/src-rt-6.x.4708/linux/linux-2.6.36/arch/x86/include/asm/pgtable_32_types.h

   1 #ifndef _ASM_X86_PGTABLE_32_DEFS_H
   2 #define _ASM_X86_PGTABLE_32_DEFS_H
   3
   4 /*
   5  * The Linux x86 paging architecture is 'compile-time dual-mode', it
   6  * implements both the traditional 2-level x86 page tables and the
   7  * newer 3-level PAE-mode page tables.
   8  */
   9 #ifdef CONFIG_X86_PAE
  10 # include <asm/pgtable-3level_types.h>
  11 # define PMD_SIZE       (1UL << PMD_SHIFT)
  12 # define PMD_MASK       (~(PMD_SIZE - 1))
  13 #else
  14 # include <asm/pgtable-2level_types.h>
  15 #endif
  16
  17 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  18 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  19
  20 /* Just any arbitrary offset to the start of the vmalloc VM area: the
  21  * current 8MB value just means that there will be a 8MB "hole" after the
  22  * physical memory until the kernel virtual memory starts.  That means that
  23  * any out-of-bounds memory accesses will hopefully be caught.
  24  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  25  * area for the same reason. ;)
  26  */
  27 #define VMALLOC_OFFSET  (8 * 1024 * 1024)
  28
  29 #ifndef __ASSEMBLY__
  30 extern bool __vmalloc_start_set; /* set once high_memory is set */
  31 #endif
  32
  33 #define VMALLOC_START   ((unsigned long)high_memory + VMALLOC_OFFSET)
  34 #ifdef CONFIG_X86_PAE
  35 #define LAST_PKMAP 512
  36 #else
  37 #define LAST_PKMAP 1024
  38 #endif
  39
  40 #define PKMAP_BASE ((FIXADDR_BOOT_START - PAGE_SIZE * (LAST_PKMAP + 1)) \
  41                     & PMD_MASK)
  42
  43 #ifdef CONFIG_HIGHMEM
  44 # define VMALLOC_END    (PKMAP_BASE - 2 * PAGE_SIZE)
  45 #else
  46 # define VMALLOC_END    (FIXADDR_START - 2 * PAGE_SIZE)
  47 #endif
  48
  49 #define MODULES_VADDR   VMALLOC_START
  50 #define MODULES_END     VMALLOC_END
  51 #define MODULES_LEN     (MODULES_VADDR - MODULES_END)
  52
  53 #define MAXMEM  (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE)
  54
  55 #endif /* _ASM_X86_PGTABLE_32_DEFS_H */