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 128             /* 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
  28 struct 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
  37 extern struct e820map e820;
  38 #endif/*!__ASSEMBLY__*/
  39
  40 #endif/*__E820_HEADER*/