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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Venkatesh Pallipadif9ba7052005-05-01 08:58:51 -070016#define E820MAX 128 /* number of entries in E820MAP */
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#define E820NR 0x1e8 /* # entries in E820MAP */
18
19#define E820_RAM 1
20#define E820_RESERVED 2
Andi Kleen80d26792006-09-26 10:52:38 +020021#define E820_ACPI 3
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#define E820_NVS 4
23
24#define HIGH_MEMORY (1024*1024)
25
26#ifndef __ASSEMBLY__
27
H. Peter Anvin9c25d132007-07-11 12:18:34 -070028struct e820entry {
29 u64 addr; /* start of memory segment */
30 u64 size; /* size of memory segment */
31 u32 type; /* type of memory segment */
32} __attribute__((packed));
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034struct e820map {
H. Peter Anvin9c25d132007-07-11 12:18:34 -070035 u32 nr_map;
36 struct e820entry map[E820MAX];
Linus Torvalds1da177e2005-04-16 15:20:36 -070037};
38
39extern struct e820map e820;
Arjan van de Ven95222362006-04-07 19:49:27 +020040
41extern int e820_all_mapped(unsigned long start, unsigned long end,
42 unsigned type);
Jan Beulichb92e9fa2007-05-02 19:27:11 +020043extern int e820_any_mapped(u64 start, u64 end, unsigned type);
bibo,maob2dff6a2006-12-07 02:14:06 +010044extern void find_max_pfn(void);
bibo,maob5b24052006-12-07 02:14:06 +010045extern void register_bootmem_low_pages(unsigned long max_low_pfn);
Yasunori Goto5c95da92006-12-22 01:09:54 -080046extern void e820_register_memory(void);
bibo,maocef518e2006-12-07 02:14:06 +010047extern void limit_regions(unsigned long long size);
48extern void print_memory_map(char *who);
Arjan van de Ven95222362006-04-07 19:49:27 +020049
Rafael J. Wysockib0cb1a12007-07-29 23:24:36 +020050#if defined(CONFIG_PM) && defined(CONFIG_HIBERNATION)
Rafael J. Wysocki1c100702007-07-21 17:11:09 +020051extern void e820_mark_nosave_regions(void);
52#else
53static inline void e820_mark_nosave_regions(void)
54{
55}
56#endif
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#endif/*!__ASSEMBLY__*/
59
60#endif/*__E820_HEADER*/