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