File: /usr/src/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     
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