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
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*/
41
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