linux/arch/x86/include/asm/pgtable_32_areas.h
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   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__
  17extern 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 */
  54