LXR linux/include/asm-i386/e820.h

   1/*
   2 * structures and definitions for the int 15, ax=e820 memory map
   3 * scheme.
   4 *
   5 * In a nutshell, arch/i386/boot/setup.S populates a scratch table
   6 * in the empty_zero_block that contains a list of usable address/size
   7 * duples.   In arch/i386/kernel/setup.c, this information is
   8 * transferred into the e820map, and in arch/i386/mm/init.c, that
   9 * new information is used to mark pages reserved or not.
  10 *
  11 */
  12#ifndef __E820_HEADER
  13#define __E820_HEADER
  14
  15#define E820MAP 0x2d0           /* our map */
  16#define E820MAX 32              /* number of entries in E820MAP */
  17#define E820NR  0x1e8           /* # entries in E820MAP */
  18
  19#define E820_RAM        1
  20#define E820_RESERVED   2
  21#define E820_ACPI       3 /* usable as RAM once ACPI tables have been read */
  22#define E820_NVS        4
  23
  24#define HIGH_MEMORY     (1024*1024)
  25
  26#ifndef __ASSEMBLY__
  27
  28struct e820map {
  29    int nr_map;
  30    struct e820entry {
  31        unsigned long long addr;        /* start of memory segment */
  32        unsigned long long size;        /* size of memory segment */
  33        unsigned long type;             /* type of memory segment */
  34    } map[E820MAX];
  35};
  36
  37extern struct e820map e820;
  38#endif/*!__ASSEMBLY__*/
  39
  40#endif/*__E820_HEADER*/
  41