arch/x86/include/asm/pgtable_32_areas.h

   1 #ifndef _ASM_X86_PGTABLE_32_AREAS_H
   2 #define _ASM_X86_PGTABLE_32_AREAS_H
   3
   4 #include <asm/cpu_entry_area.h>
   5
   6 /*
   7  * Just any arbitrary offset to the start of the vmalloc VM area: the
   8  * current 8MB value just means that there will be a 8MB "hole" after the
   9  * physical memory until the kernel virtual memory starts.  That means that
  10  * any out-of-bounds memory accesses will hopefully be caught.
  11  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  12  * area for the same reason. ;)
  13  */
  14 #define VMALLOC_OFFSET  (8 * 1024 * 1024)
  15
  16 #ifndef __ASSEMBLY__
  17 extern bool __vmalloc_start_set; /* set once high_memory is set */
  18 #endif
  19
  20 #define VMALLOC_START   ((unsigned long)high_memory + VMALLOC_OFFSET)
  21 #ifdef CONFIG_X86_PAE
  22 #define LAST_PKMAP 512
  23 #else
  24 #define LAST_PKMAP 1024
  25 #endif
  26
  27 #define CPU_ENTRY_AREA_PAGES            (NR_CPUS * DIV_ROUND_UP(sizeof(struct cpu_entry_area), PAGE_SIZE))
  28
  29 /* The +1 is for the readonly IDT page: */
  30 #define CPU_ENTRY_AREA_BASE     \
  31         ((FIXADDR_TOT_START - PAGE_SIZE*(CPU_ENTRY_AREA_PAGES+1)) & PMD_MASK)
  32
  33 #define LDT_BASE_ADDR           \
  34         ((CPU_ENTRY_AREA_BASE - PAGE_SIZE) & PMD_MASK)
  35
  36 #define LDT_END_ADDR            (LDT_BASE_ADDR + PMD_SIZE)
  37
  38 #define PKMAP_BASE              \
  39         ((LDT_BASE_ADDR - PAGE_SIZE) & PMD_MASK)
  40
  41 #ifdef CONFIG_HIGHMEM
  42 # define VMALLOC_END    (PKMAP_BASE - 2 * PAGE_SIZE)
  43 #else
  44 # define VMALLOC_END    (LDT_BASE_ADDR - 2 * PAGE_SIZE)
  45 #endif
  46
  47 #define MODULES_VADDR   VMALLOC_START
  48 #define MODULES_END     VMALLOC_END
  49 #define MODULES_LEN     (MODULES_VADDR - MODULES_END)
  50
  51 #define MAXMEM  (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE)
  52
  53 #endif /* _ASM_X86_PGTABLE_32_AREAS_H */