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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, setup.S populates a scratch table in the
6 * empty_zero_block that contains a list of usable address/size
7 * duples. setup.c, this information is transferred into the e820map,
8 * and in init.c/numa.c, that new information is used to mark pages
9 * reserved or not.
10 */
11#ifndef __E820_HEADER
12#define __E820_HEADER
13
14#include <linux/mmzone.h>
15
16#define E820MAP 0x2d0 /* our map */
Venkatesh Pallipadif9ba7052005-05-01 08:58:51 -070017#define E820MAX 128 /* number of entries in E820MAP */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#define E820NR 0x1e8 /* # entries in E820MAP */
19
20#define E820_RAM 1
21#define E820_RESERVED 2
22#define E820_ACPI 3 /* usable as RAM once ACPI tables have been read */
23#define E820_NVS 4
24
25#define HIGH_MEMORY (1024*1024)
26
27#define LOWMEMSIZE() (0x9f000)
28
29#ifndef __ASSEMBLY__
30struct e820entry {
31 u64 addr; /* start of memory segment */
32 u64 size; /* size of memory segment */
33 u32 type; /* type of memory segment */
34} __attribute__((packed));
35
36struct e820map {
37 int nr_map;
38 struct e820entry map[E820MAX];
39};
40
41extern unsigned long find_e820_area(unsigned long start, unsigned long end,
42 unsigned size);
43extern void add_memory_region(unsigned long start, unsigned long size,
44 int type);
45extern void setup_memory_region(void);
46extern void contig_e820_setup(void);
47extern unsigned long e820_end_of_ram(void);
48extern void e820_reserve_resources(void);
49extern void e820_print_map(char *who);
50extern int e820_mapped(unsigned long start, unsigned long end, unsigned type);
51
52extern void e820_bootmem_free(pg_data_t *pgdat, unsigned long start,unsigned long end);
Andi Kleena1e97782005-04-16 15:25:12 -070053extern void e820_setup_gap(void);
Andi Kleen485761b2005-08-26 18:34:10 -070054extern unsigned long e820_hole_size(unsigned long start_pfn,
55 unsigned long end_pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57extern void __init parse_memopt(char *p, char **end);
58
59extern struct e820map e820;
60#endif/*!__ASSEMBLY__*/
61
62#endif/*__E820_HEADER*/